阅读说明：本技术 投影设备 (Projection device ) 是由 陈友才 杨长明 于 2021-04-09 设计创作，主要内容包括：本申请公开了一种投影设备,属于投影技术领域。该投影设备包括：光学引擎和投影屏幕；投影屏幕包括基座、卷曲组件、升降组件、光学幕布和第一调节机构；卷曲组件固定在基座上,光学幕布与卷曲组件固定连接；升降组件包括多组支架和横梁,每组支架包括第一支撑杆和第二支撑杆,第一支撑杆的第二端与第二支撑杆的第一端之间为可旋转连接,光学幕布还与横梁固定连接；第一调节机构连接第一支撑杆的第二端和第二支撑杆的第一端。本申请中,可以通过第一调节机构调整第一支撑杆的第二端和第二支撑杆的第一端的相对位置,进而对光学幕布的俯仰角度进行调整,从而避免光学幕布上显示的画面出现畸变、模糊失真等问题,提高投影屏幕的显示效果。(The application discloses projection equipment belongs to projection technical field. The projection device includes: an optical engine and a projection screen; the projection screen comprises a base, a curling assembly, a lifting assembly, an optical curtain and a first adjusting mechanism; the curling component is fixed on the base, and the optical curtain is fixedly connected with the curling component; the lifting assembly comprises a plurality of groups of supports and a cross beam, each group of supports comprises a first supporting rod and a second supporting rod, the second end of the first supporting rod is rotatably connected with the first end of the second supporting rod, and the optical curtain is also fixedly connected with the cross beam; the first adjusting mechanism is connected with the second end of the first supporting rod and the first end of the second supporting rod. In this application, can adjust the relative position of the second end of first bracing piece and the first end of second bracing piece through first adjustment mechanism, and then adjust the every single move angle of optics curtain to avoid the picture that shows on the optics curtain to appear distortion, fuzzy distortion scheduling problem, improve projection screen's display effect.)

1. A projection device, characterized in that the projection device comprises:

an optical engine to emit a light beam;

the projection screen comprises a base, a curling assembly, a lifting assembly, an optical curtain and a first adjusting mechanism;

the optical curtain is fixedly connected with the cross beam, and is used for reflecting light beams emitted by the optical engine to display pictures;

the first adjusting mechanism is connected with the second end of the first supporting rod and the first end of the second supporting rod, and the first adjusting mechanism is used for adjusting the relative positions of the second end of the first supporting rod and the first end of the second supporting rod so as to adjust the pitching angle of the optical curtain.

2. The projection device of claim 1, wherein the first adjustment mechanism includes a first limit plate, a second limit plate, and an adjustment bolt;

the first limiting plate and the second limiting plate are arranged oppositely, at least part of the second end of the first supporting rod and at least part of the first end of the second supporting rod are located between the first limiting plate and the second limiting plate, and the adjusting bolt is connected with the first limiting plate and the second limiting plate and used for adjusting the distance between the first limiting plate and the second limiting plate.

3. The projection apparatus of claim 1, wherein the first adjustment mechanism is an adjustment screw, the adjustment screw is connected to one of the first support bar and the second support bar, and one end of the adjustment screw abuts against a sidewall of the other.

4. The projection device of claim 3, wherein each set of brackets further includes a first connecting shaft;

the second end of the first supporting rod is provided with a first connecting groove, the first end of the second supporting rod extends into the first connecting groove, and the first connecting shaft penetrates through the groove wall of the first connecting groove and the first end of the second supporting rod;

one end of the adjusting screw is screwed into the first connecting groove along the outer wall of the first supporting rod and is abutted against the outer wall of the second supporting rod.

5. The projection device of claim 4, wherein the first support bar comprises a rod and two first connecting plates;

the first end of the rod body is rotatably connected with the base, the two first connecting plates are oppositely arranged at the end part of the second end of the rod body to form the first connecting groove, and at least one adjusting screw is connected to at least one first connecting plate.

6. The projection device of claim 5, wherein three of the adjustment screws are attached to each first connection plate, the three adjustment screws defining a polygon.

7. The projection device of any of claims 4-6, wherein the projection screen further comprises a spacer;

the adjusting shim is positioned in the first connecting groove and is sleeved on the first connecting shaft in a sliding manner, and the adjusting shim is clamped between one end of the adjusting screw and the side wall of the second supporting rod.

8. The projection device of claim 1, further comprising a second adjustment mechanism connecting the first end of the first support rod and the base, the second adjustment mechanism for adjusting the relative position of the first end of the first support rod and the base.

9. The projection device of claim 1 or 8, wherein the projection device further comprises a third adjustment mechanism connecting the second end of the second support rod and the beam, the third adjustment mechanism for adjusting the relative position of the second end of the second support rod and the beam.

10. The projection device of claim 1, wherein the optical curtain comprises an optical film and a flexible carrier;

the optical membrane is adhered to the flexible carrier, and the first side edge of the flexible carrier is fixedly connected with the curling assembly;

the second side opposite to the first side on the flexible carrier is fixedly connected with the cross beam, the plurality of groups of supports can control the flexible carrier to be unfolded, and the optical membrane is supported in a flat state when the flexible carrier is unfolded.

11. The projection device of any of claims 1-6, wherein the projection device comprises a base for receiving the optical engine and the projection screen, the optical engine being a fixed predetermined distance from the projection screen when the projection screen is in the extended state.

Technical Field

The embodiment of the application relates to the technical field of projection, in particular to projection equipment.

Background

With the continuous development of science and technology, projection equipment is more and more applied to the work and the life of people. Currently, a projection device mainly includes an optical engine and a projection screen. The light outlet side of the optical engine faces the projection screen to emit light beams to the projection screen, and the projection screen is used for receiving the light beams and displaying pictures.

In the related art, as shown in fig. 1, a projection screen 1 includes an optical curtain 11, a curling assembly 12, a lifting assembly 13, and a base 14. The curling component 12 is fixed on the base 14, the optical curtain 11 is fixedly connected with the curling component 12, and meanwhile, the optical curtain 11 is also fixedly connected with one end of the lifting component 13 far away from the curling component 12. The lifting assembly 13 and the curling assembly 12 can control the unfolding and curling of the optical curtain 11. Wherein, lifting unit 13 includes the multiunit support, and every group support includes first bracing piece 131 and second bracing piece 132, between the first end of first bracing piece 131 and base 14, between the second end of first bracing piece 131 and the first end of second bracing piece 132 to and these three freely movable joint department are rotatable coupling between the second end of second bracing piece 132 and the optics curtain 11, and multiunit support can control optics curtain 11 and expand.

However, since the assembly gaps are reserved at the three movable joints, when the lifting assembly 13 is lifted to unfold the optical curtain 11, the lifting assembly 13 is easily inclined due to the assembly gaps reserved at the three movable joints under the reverse acting force of the optical curtain 11. Thus, after the lifting assembly is tilted, the optical curtain 11 is also tilted, which causes problems such as distortion and blurring distortion of the image displayed on the optical curtain 11, thereby affecting the display effect of the projection screen 1.

Disclosure of Invention

The application provides a projection device, which can solve the problem that an optical curtain in the projection device is easy to incline. The technical scheme is as follows:

a projection device, the projection device comprising:

an optical engine to emit a light beam;

the projection screen comprises a base, a curling assembly, a lifting assembly, an optical curtain and a first adjusting mechanism;

the optical curtain is fixedly connected with the cross beam, and is used for reflecting light beams emitted by the optical engine to display pictures;

the first adjusting mechanism is connected with the second end of the first supporting rod and the first end of the second supporting rod, and the first adjusting mechanism is used for adjusting the relative positions of the second end of the first supporting rod and the first end of the second supporting rod so as to adjust the pitching angle of the optical curtain.

The technical scheme provided by the application has the beneficial effects that:

when the optical curtain is in an unfolding state, the relative positions of the second end of the first supporting rod and the first end of the second supporting rod are adjusted through the first adjusting mechanism so as to adjust the inclination angle of the second supporting rod, and further the adjustment of the second end of the second supporting rod in the thickness direction of the optical curtain is realized. Therefore, under the condition that the second end of the second supporting rod is connected with the optical curtain through the cross beam, the pitching angle of the optical curtain is adjusted, the pitching angle of the optical curtain is corrected, the problems of distortion, fuzzy distortion and the like of a picture displayed on the optical curtain can be avoided, and the display effect of the projection screen is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a partially enlarged structural schematic view of a projection screen provided in the related art;

FIG. 2 is a schematic diagram of a side view of a projection screen provided in the related art;

FIG. 3 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 4 is a schematic side view of a lift assembly according to an embodiment of the present disclosure;

FIG. 5 is a schematic side view of another embodiment of a lift assembly;

FIG. 6 is a schematic diagram of a tilted side view of a stand according to an embodiment of the present disclosure;

fig. 7 is a schematic rear view of a projection screen according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present application.

Reference numerals:

the related technology comprises the following steps:

1: a projection screen; 11: an optical curtain; 12: a crimping assembly; 13: a lifting assembly; 14: a base; 131: a first support bar; 132: a second support bar; 133: and (7) connecting the shafts.

The embodiment of the application:

1: an optical engine; 2: a projection screen; 3: a base;

21: a base; 22: a crimping assembly; 23: a lifting assembly; 24: an optical curtain; 25: a first adjustment mechanism; 26: adjusting the gasket;

231: a first support bar; 232: a second support bar; 233: a first connecting shaft; 234: a cross beam;

2311: a rod body; 2312: a first connecting plate;

251: a first limit plate; 252: a second limiting plate; 253: adjusting the bolt; 254: and adjusting the screw.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the following will explain the situation that the optical curtain is cut or twisted in combination with the related art.

In the related art, as for the plurality of sets of brackets included in the lifting assembly 13, as shown in fig. 1, each set of brackets may further include a connecting shaft 133; the second end of the first support rod 131 is provided with a first connection groove, the first end of the second support rod 132 extends into the first connection groove, and the second end of the first support rod 131 and the first end of the second support rod 132 are rotatably connected through a connection shaft 133. Wherein, the two groove walls of the first connecting groove and the side wall of the first end of the second supporting rod 132 are both provided with a connecting hole, and the connecting shaft 133 passes through the connecting holes on the two groove walls and the connecting hole on the second supporting rod 132 to realize the rotatable connection of the first supporting rod 131 and the second supporting rod 132.

Normally, a fitting clearance is provided between the hole wall of the connection hole on the groove wall and the connection shaft 133. For example, the gap between the hole wall of the connection hole on the groove wall and the connection shaft 133 may be less than or equal to 0.2 mm. Thus, the second supporting rod 132 is easily inclined under the action of external force, so that the relative position relationship between the second end of the first supporting rod 131 and the first end of the second supporting rod 132 is changed, and an included angle is formed between the straight line of the central points of the two connecting holes in the first connecting groove and the axial direction of the connecting shaft 133. Further, when the second supporting rod 132 is tilted, the optical curtain 11 may also be tilted forward or backward.

Wherein, the angle at which the second supporting rod 132 inclines is equal to the included angle between the straight line at the central points of the two connecting holes on the first connecting groove and the axial direction of the connecting shaft 133, and the maximum included angle between the straight line at the central points of the two connecting holes on the first connecting groove and the axial direction of the connecting shaft 133 can be calculated according to the following formula:

α＝tan^-1D/B

wherein α is a maximum included angle between a straight line where center points of two connection holes on the first connection groove are located and an axial direction of the connection shaft 133, D is a gap between a hole wall of the connection hole and the connection shaft 133, and B is a distance between two groove walls of the first connection groove.

It should be noted that, since the position of the curling element 12 is fixed, the position of the side of the optical curtain 11 connected to the curling element 12 does not change. The second support rods 132 included in the plurality of sets of brackets may be inclined away from the optical curtain 11, so that one side of the optical curtain 11 connected to the plurality of sets of brackets is tilted backwards, thereby causing the optical curtain 11 to tilt backwards; alternatively, as shown in fig. 2, the second support rods 132 included in the plurality of sets of brackets may tilt close to the optical curtain 11, such that the side of the optical curtain 11 connected to the plurality of sets of brackets tilts forward, thereby causing the optical curtain 11 to tilt forward.

It should be noted that, in the multiple sets of brackets, there may be a tilt of the second support rod 132 included in at least one set of brackets away from the optical curtain 11 or close to the optical curtain 11, so that one side of the optical curtain 11 connected to the multiple sets of brackets is twisted, thereby causing the optical curtain 11 to be twisted. In the at least one set of brackets, there may be a tilt of the second support rod 132 away from the optical curtain 11, and there may also be a tilt of the second support rod 132 close to the optical curtain 11.

Based on the above description, in the related art, there is a problem that the optical curtain 11 included in the projection screen 1 is easily tilted forward, tilted backward or distorted, so that the optical curtain 11 cannot normally receive the light beam emitted from the optical engine, and thus the displayed image is distorted, blurred and distorted.

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 3, the projection apparatus includes: an optical engine 1 and a projection screen 2, the optical engine 1 is used for emitting light beams; the projection screen 2 comprises a base 21, a curling assembly 22, a lifting assembly 23, an optical curtain 24 and a first adjusting mechanism 25; the curling assembly 22 is fixed on the base 21, the optical curtain 24 is fixedly connected with the curling assembly 22, the lifting assembly 23 comprises a plurality of groups of supports and a beam 234, each group of supports comprises a first supporting rod 231 and a second supporting rod 232, the first end of the first supporting rod 231 is connected with the base 21, the second end of the first supporting rod 231 is connected with the first end of the second supporting rod 232, the second end of the second supporting rod 232 is rotatably connected with the beam 234, the optical curtain 24 is also fixedly connected with the beam 234, and the optical curtain 24 is used for reflecting light beams emitted by the optical engine 1 to display pictures; the first adjusting mechanism 25 is connected to the second end of the first supporting rod 231 and the first end of the second supporting rod 232, and the first adjusting mechanism 25 is used for adjusting the relative positions of the second end of the first supporting rod 231 and the first end of the second supporting rod 232 to adjust the pitch angle of the optical curtain 24.

In the embodiment of the present application, when the optical curtain 24 is in the unfolded state, the relative position between the second end of the first supporting rod 231 and the first end of the second supporting rod 232 is adjusted by the first adjusting mechanism 25 to adjust the inclination angle of the second supporting rod 232, so as to adjust the thickness direction of the optical curtain 24 by the second end of the second supporting rod. Thus, under the condition that the second end of the second support rod 232 is connected to the optical curtain 24 through the cross beam 234, the adjustment of the pitch angle of the optical curtain 24 is realized, so as to realize the correction of the pitch angle of the optical curtain 24, thereby avoiding the distortion, the fuzzy distortion and other problems of the image displayed on the optical curtain 24, and improving the display effect of the projection screen 2.

Wherein, the curling component 22 and the lifting component 23 are matched to control the optical curtain 24 to curl on the curling component 22 when the projection device is not used, thereby reducing the space occupied by the projection screen 2; when the projection device is used, the optical curtain 24 is controlled to be unfolded, so that the optical curtain 24 reflects the light beams emitted by the optical engine 1 and displays pictures.

In some embodiments, the base 21 is fixedly connected to the mounting surface to fix the projection screen 2. The mounting surface may be a support surface of a fixing bracket or a wall surface of a wall body, as long as the fixing support of the projection screen 2 can be realized.

In some embodiments, the optical engine 1 is an ultra-short-focus optical engine, but the optical engine 1 can also be a short-focus optical engine or a long-focus optical engine.

The optical engine 1 includes a light source, an optical-mechanical system and a lens. The optical-mechanical system comprises a DMD (Digital micro mirror Device) chip, a control circuit board, an audio processing system, a sound box, a heat dissipation system and a radiator, wherein the light source and the lens are fixedly connected with the optical-mechanical system, the DMD chip is arranged in the optical-mechanical system, the DMD chip, the audio processing system and the heat dissipation system are respectively and electrically connected with the control circuit board, the audio processing system is also electrically connected with the sound box, and the heat dissipation system is also electrically connected with the radiator.

Thus, the light beam emitted from the light source is emitted to the DMD chip in the optical-mechanical system, the control circuit board modulates the light beam emitted to the DMD chip by controlling the DMD chip, emits the modulated light beam to the lens, and emits the light beam to the optical curtain 24 through the lens to realize the display of the picture. In addition, the control circuit board controls the audio processing system to process the audio information output by the control circuit board, and the processed audio information is played outside through the sound box. When the image information is displayed and the audio information is externally displayed, the control circuit board can control the heat dissipation system to drive the heat sink to dissipate heat, so that the function of each device is prevented from being influenced by high temperature.

The case of the first adjustment mechanism will be explained in detail next.

In the embodiment of the present application, in order to adjust the relative positions of the second end of the first support rod 231 and the first end of the second support rod 232 by the first adjusting mechanism 25, in some embodiments, as shown in fig. 4, the first adjusting mechanism 25 includes a first limiting plate 251, a second limiting plate 252 and an adjusting bolt 253; the first and second limiting plates 251 and 252 are oppositely disposed, at least a portion of the second end of the first supporting bar 231 and at least a portion of the first end of the second supporting bar 232 are located between the first and second limiting plates 251 and 252, and the adjusting bolt 253 connects the first and second limiting plates 251 and 252 and is used for adjusting the distance between the first and second limiting plates 251 and 252.

Thus, when the second supporting rod 232 is inclined, the distance between the first limiting plate 251 and the second limiting plate 252 can be pulled in by the adjusting bolt 253, and the distance between the second end of the first supporting rod 231 and the first end of the second supporting rod 232 is further tightened, so as to adjust the relative position of the second end of the first supporting rod 231 and the first end of the second supporting rod 232.

Wherein, adjusting bolt 253's quantity is a plurality of to guarantee that first limiting plate 251 and second limiting plate 252 are parallel to each other through a plurality of adjusting bolt 253, thereby can guarantee the adjustment type effect to the please angle of second bracing piece. Illustratively, three adjusting bolts 253 are connected to the first limiting plate 251 and the second limiting plate 252, and the three adjusting bolts 253 enclose a polygon.

Since the first support rod 231 and the second support rod 232 rotate relatively when the optical curtain 24 is curled, in order to avoid the plurality of adjustment bolts 253 from being obstructed, the plurality of adjustment bolts 253 may be connected to the outer side of the corner formed by the first support rod 231 and the second support rod 232.

In addition, when the relative positions of the second end of the first supporting rod 231 and the first end of the second supporting rod 232 are adjusted through the first limiting plate 251 and the second limiting plate 252, in order to facilitate the subsequent relative rotation between the first supporting rod 231 and the second supporting rod 232, two opposite surfaces of the first limiting plate 251 and the second limiting plate 252 are provided with lubricating coatings, and then the friction between the first limiting plate 251 and the second limiting plate 252 when the first supporting rod 231 and the second supporting rod 232 rotate relatively is reduced through the lubricating coatings.

In other embodiments, as shown in fig. 5 or 6, the first adjusting mechanism 25 is an adjusting screw 254, the adjusting screw 254 is connected to one of the first supporting rod 231 and the second supporting rod 232, and one end of the adjusting screw 254 abuts against a sidewall of the other one. Illustratively, the adjustment screw 254 is coupled to the first support bar 231, and one end of the adjustment screw 254 abuts against a side wall of the second support bar 232. Thus, compared to fig. 5 and 6, when the second support rod 232 is inclined, the abutting force of the adjustment screw 254 against the first end of the second support rod 232 can be adjusted to adjust the relative position between the second end of the first support rod 231 and the first end of the second support rod 232, thereby adjusting the inclination angle of the second support rod 232.

In some embodiments, the number of sets of supports is provided in two sets, such that one set of supports is provided near each end of the crimping assembly 22, and the two sets of supports deploy the optical curtain 24 based on the two ends near one side of the optical curtain 24. Of course, the number of sets of stents may be provided in three sets, such that one set of stents is provided near each end of crimping assembly 22 and one set of stents is provided near the middle of crimping assembly 22. Thus, three sets of brackets may be used to deploy the optical curtain 24 based on both ends near one side of the optical curtain 24, and a central location near that side of the optical curtain 24.

In some embodiments, as shown in fig. 4 or 5, each set of brackets includes a first connecting shaft 233, the second end of the first supporting bar 231 has a first connecting groove, the first end of the second supporting bar 232 extends into the first connecting groove, and the first connecting shaft 233 passes through the groove wall of the first connecting groove and the first end of the second supporting bar 232.

As shown in fig. 4, when the first adjustment mechanism 25 includes the first limiting plate 251, the second limiting plate 252 and the adjustment bolt 253, a portion of the first supporting rod 231 located at one side of the second supporting rod 232 and the second supporting rod 232 are located between the first limiting plate 251 and the second limiting plate 252. As shown in fig. 5, when the first adjustment mechanism 25 is an adjustment screw 254, one end of the adjustment screw 254 is screwed into the first connection groove along the outer wall of the first support bar 231 and abuts against the outer wall of the second support bar 232.

Wherein, the shape of the bottom surface of the first connection groove may be set according to the shape of the first support bar 231. Illustratively, when the cross-sectional shape of the first support bar 231 is square, the groove bottom surface of the first connection groove is also square in shape; when the cross-sectional shape of the first support bar 231 is circular, the groove bottom surface of the first coupling groove is also circular in shape.

Two ends of the first connecting shaft 233 are respectively provided with a fixing nut, and each fixing nut is tightly pressed on the side wall of the first supporting rod 231 after being screwed. In this way, the first connecting shaft 233 is fixedly connected with the first supporting rod 231, and thus when the second supporting rod 232 rotates around the first connecting shaft 233, the angle change between the second supporting rod 232 and the first supporting rod 231 can be realized, so that the extension and the folding of the stent can be realized.

In some embodiments, as shown in fig. 4 or 5, the first support bar 231 includes a bar body 2311 and two first connection plates 2312; the first end of the rod body 2311 is rotatably connected with the base 21, and two first connecting plates 2312 are oppositely arranged at the end part of the second end of the rod body 2311 to form a first connecting groove.

Here, as shown in fig. 4, when the first adjustment mechanism 25 includes the first stopper plate 251, the second stopper plate 252 and the adjustment bolt 253, the end of one of the first link plate 2312 and the second link rod 232 is located between the first stopper plate 251 and the second stopper plate 252. Thus, the distance between the first and second limit plates 251 and 252 is drawn by the adjustment bolt 253, and the distance between the first connection plate 2312 and the first end of the second support rod 232 is tightened, so that the relative position of the second end of the first support rod 231 and the first end of the second support rod 232 can be adjusted.

As shown in fig. 5, when the first adjustment mechanism 25 is an adjustment screw 254, at least one adjustment screw 254 is disposed on at least one first connection plate 2312. In this way, the adjusting screw 254 provided on the first connecting plate 2312 can be rotated, so that the adjusting screw 254 pushes the second supporting rod 232, thereby adjusting the relative position of the second supporting rod 232 and the first supporting rod 231.

Wherein, two first connecting plates 2312 can set up relatively, and all with the lateral wall fixed connection of body of rod 2311 to form the great first connecting groove in space. The two first connecting plates 2312 may be respectively welded to the rod bodies 2311, or may be respectively integrally formed with the rod bodies 2311, which is not limited in the embodiment of the present application.

One adjusting screw 254 may be disposed on any one of the two first connection plates 2312, and the adjusting screw 254 and the first connection shaft 233 are not located at the same height. In this way, when the adjusting screw 254 is rotated, the rotating screw abuts against the second support rod 232 and pushes the second support rod 232 with the first connecting shaft 233 as a fulcrum, so as to adjust the inclination angle of the second support rod 232, thereby adjusting the relative position of the first end of the second support rod 232 and the second end of the first support rod 231.

Of course, two adjusting screws 254 may be disposed on any one of the first connecting plates 2312, and a straight line formed by the two adjusting screws 254 may be along the vertical direction or may form an acute angle with the vertical direction, which is not limited in the embodiment of the present application. In practice, two adjustment screws 254 may be used in combination. Specifically, the upper adjusting screw 254 is kept fixed and abutted against the sidewall of the second support rod 232, and the other adjusting screw 254 is rotated to make the adjusting screw 254 push the second support rod 232, so that the second support rod 232 can be controlled to swing towards the direction perpendicular to the connecting line of the two adjusting screws 254, and the inclination angle of the second support rod 232 can be adjusted to realize the adjustment of the relative position of the first end of the second support rod 232 and the second end of the first support rod 231.

Of course, as shown in fig. 7, three adjusting screws 254 may be provided on any one of the first connection plates 2312, and the three adjusting screws 254 may enclose a polygon. Thus, the three adjusting screws 254 restrain the second supporting rod 232 at three positions, and the end portions of the three adjusting screws 254 form a plane, so that the second supporting rod 232 can be effectively prevented from randomly swinging towards the plane where the end portions of the three adjusting screws 254 are located, and the moving state of the second supporting rod 232 is more stable.

It should be noted that, one, two or three adjusting screws 254 may be further disposed on each first connecting plate 2312, and since the first end of the second supporting rod 232 extends into the first connecting groove formed by the two first connecting plates 2312, the pushing directions of the adjusting screws 254 on the two first connecting plates 2312 to the second supporting rod 232 are opposite, so as to achieve the reciprocating adjustment of the inclination angle of the second supporting rod 232, and further achieve the adjustment of the relative position of the first end of the second supporting rod 232 and the second end of the first supporting rod 231.

In some embodiments, as shown in fig. 3 or 5, projection screen 2 may also include a spacer 26; the adjusting shim 26 is disposed in the first connecting groove and slidably sleeved on the first connecting shaft 233, and the adjusting shim 26 is clamped between one end of the adjusting screw 254 and the side wall of the second supporting rod 232. Thus, the adjusting screw 254 is directly abutted against the adjusting shim 26 to disperse the thrust applied to the second support rod 232 by the end of the adjusting screw 254 through the adjusting shim 26, so that the stress on the second support rod 232 is more uniform, and the stress concentration and the non-uniform stress caused by the direct contact between the adjusting screw 254 and the side wall of the second support rod 232 are avoided.

The adjusting pad 26 may have a circular sheet-like structure. Of course, the structure may also be a square, a triangle or other shapes, which is not limited in the embodiments of the present application. It should be noted that, when the first support rod 231 includes the first connection plate 2312, the adjustment pad 26 may be shaped like the first connection plate 2312 in order to allow the adjustment screw 254 provided at any position of the first connection plate 2312 to abut against the adjustment pad 26.

The thickness of the adjusting shim 26 may be much smaller than the width of the gap between the second end of the first support bar 231 and the first end of the second support bar 232 along the length direction of the first connecting shaft 233, so that the adjusting screw 254 can freely adjust the position relationship between the first support bar 231 and the second support bar 232. Illustratively, the shim 26 may have a thickness that is one-sixth the width of the gap.

In the embodiment of the present application, the first end of the first supporting rod 231 is rotatably connected to the base 21, and the second end of the second supporting rod 232 is rotatably connected to the cross beam, and an assembly gap is reserved for rotation, so that when the assembly gap exists, the first supporting rod 231 is inclined relative to the base 21, and the cross beam 234 is inclined relative to the second supporting rod 232, so as to incline the optical curtain 24.

To this end, in some embodiments, the projection device further includes a second adjustment mechanism connecting the first end of the first support rod 231 and the base 21, the second adjustment mechanism being used to adjust the relative position of the first end of the first support rod 231 and the base 21. In this way, the relative position of the first support rod 231 and the base 21 can be adjusted by the second adjusting mechanism, so as to adjust the inclination angle of the first support rod 231.

The structure of the second adjusting mechanism can refer to the structure of the first adjusting mechanism described in the above embodiments, which is not described in detail in this application.

Optionally, each set of brackets further comprises a second connecting shaft; the base 21 has a second connection groove, the first end of the first support rod 231 extends into the second connection groove, and the second connection shaft passes through the first end of the first support rod 231 and the groove wall of the second connection groove.

The connection manner of the second adjusting mechanism between the first end of the first supporting rod 231 and the base 21 can refer to the connection manner of the first adjusting mechanism 25 between the second end of the first supporting rod 231 and the first end of the second supporting rod 232 described in the above embodiments, and the structure of the second connecting groove is the same as or similar to that of the first connecting groove, which is not described again in this embodiment of the present application.

In addition, when the second adjusting mechanism is an adjusting screw, an adjusting shim 26 is disposed in the second connecting groove, and the adjusting shim 26 is slidably sleeved on the second connecting shaft, and the adjusting shim 26 is clamped between one end of the adjusting screw and the side wall of the first supporting rod 231. In addition, the function and shape of the adjusting pad 26 are the same as or similar to those of the adjusting pad 26 in the above embodiments, and are not described again in this embodiment.

In some embodiments, the projection device further comprises a third adjustment mechanism connecting the second end of the second support rod 232 and the beam, the third adjustment mechanism being configured to adjust the relative position of the second end of the second support rod 232 and the beam. In this way, the relative position of the second support rod 232 and the cross beam can be adjusted by the third adjusting mechanism, so as to adjust the inclination angle of the cross beam 234.

The structure of the third adjusting mechanism can refer to the structure of the first adjusting mechanism described in the above embodiments, which is not described in detail in this application.

Optionally, each set of brackets further comprises a third connecting shaft; the cross member 234 has a third connecting groove into which the second end of the second support rod 232 extends, and a third connecting shaft passes through the second end of the second support rod 232 and a groove wall of the third connecting groove.

The connection manner of the third adjusting mechanism between the second end of the second support rod 231 and the cross beam 243 can refer to the connection manner of the first adjusting mechanism 25 between the second end of the first support rod 231 and the first end of the second support rod 232 described in the above embodiments, and the structure of the third connection groove is the same as or similar to that of the first connection groove, which is not described again in this embodiment of the present application.

In addition, when the third adjusting mechanism is an adjusting screw, an adjusting shim 26 is also disposed in the third connecting groove, and the adjusting shim 26 is slidably sleeved on the third connecting shaft, and the adjusting shim 26 is clamped between one end of the adjusting screw and the side wall of the second supporting rod 232. Similarly, the function and shape of the adjusting pad 26 are the same as or similar to those of the adjusting pad 26 in the above embodiments, and the description thereof in the embodiments of the present application is omitted.

In the embodiment of the present application, besides the pitch angle of the optical curtain 24 is adjusted by the first adjusting mechanism 25, the pitch angle of the optical curtain 24 may be adjusted by other methods, or the pitch angle of the optical curtain may be adjusted by a combination of several methods. Illustratively, the projection screen includes a guide roller, and the pitch angle of the optical curtain 24 is adjusted by the guide roller; or the projection screen further comprises a tensioning mechanism, and the tilt angle of the optical curtain 24 is adjusted by the tensioning mechanism.

Next, a case where the projection screen includes the guide roller will be explained in detail.

In some embodiments, the projection screen further comprises a guide roller; the guide roller is arranged on the base and can be pressed on the optical curtain to limit the pitching angle of the optical curtain.

Optionally, the guide roller is of a strip structure so as to be pressed on the optical curtain along the length direction, so that the optical curtain is limited in a large range. Of course, the guide roller may have other shapes, as long as it can press the optical curtain and limit the pitch angle of the optical curtain, which is not limited in the embodiments of the present application.

The cross section of the guide roller is circular or polygonal, which is not limited in the embodiments of the present application. The guide roller with the round cross section is convenient to process, and the surface of the guide roller is smooth and not easy to damage the optical curtain. The guide roller with the polygonal cross section has stronger stability and is not easy to shake. When the cross section of the guide roller is polygonal, the cross section may be square, hexagonal, or the like, for example, and this is not limited in the embodiments of the present application.

When the optical curtain is rolled or unrolled, the guide roller may be fixed or may rotate around its own axis along the longitudinal direction. Under the condition that the guide roll can rotate, when the subassembly that curls in order to pack up the optics curtain, or the lifting unit is taut in order to expand the optics curtain, the guide roll can rotate to can reduce the frictional force between guide roll and the optics curtain, prevent to produce the friction between guide roll and the optics curtain and cause the harm to the optics curtain. Of course, when the rolling assembly rolls to retract the optical curtain or the lifting assembly pulls to unfold the optical curtain, the guide roller may be moved away from the optical curtain to prevent friction, so as to avoid direct contact between the guide roller and the optical curtain.

In some embodiments, the guide rollers may be controlled away from the optical curtain during tensioning of the lift assembly to deploy the optical curtain. When the optical curtain is unfolded on the lifting assembly, the guide roller can be controlled to be pressed on the optical curtain so as to limit the pitching angle of the optical curtain. During the process of rolling the rolling component to retract the optical curtain, the guide roller originally pressed on the optical curtain can be removed, so that the friction generated by the direct contact between the guide roller and the optical curtain is avoided. Furthermore, when the projection screen is used next time, the guide roller can be kept at the original position, and when the optical curtain is unfolded on the lifting assembly again, the guide roller can be continuously controlled to be pressed on the optical curtain.

It should be noted that, in order to realize that the guide roller pressed on the optical curtain can rotate around its own axis along the length direction, the guide roller can be a drum-type guide roller, and the drum-type guide roller includes a central shaft and a hollow cylindrical roller, the central shaft can be fixed, and the hollow cylindrical roller can rotate around the central shaft. Of course, the guide roller may be another type of guide roller, which is not limited in this application. The hollow cylindrical roller can be a hollow cylindrical roller or a hollow prismatic roller.

In some embodiments, the guide roller is provided with a protective coating, so that the protective coating can avoid direct contact between the guide roller and the optical curtain, and can avoid the surface of the guide roller from scratching the optical curtain due to unsmooth reasons and the like when relative motion is generated between the optical curtain and the guide roller, thereby prolonging the service life of the optical curtain. The protective coating may be a coating composed of flexible particles, or may be a colloidal coating, which is not limited in the embodiment of the present application.

In some embodiments, the side wall of the base has a first guide groove through which the guide roller passes and is movable in a length direction of the first guide groove. Thus, after the guide roller contacts with the optical curtain and continues to move along the length direction of the first guide groove, the optical curtain can be pushed. Because one side edge of the optical curtain far away from the guide roller is fixed, the pitching angle of the optical curtain can be changed when the guide roller pushes the optical curtain. Further, when the guide roller changes the pitch angle of the optical curtain to the target pitch angle, the guide roller can be controlled to stop moving, and the guide roller is fixed to press the guide roller on the optical curtain, so that the pitch angle of the optical curtain is limited. The target pitching angle of the optical curtain is an included angle between a preset plane where the optical curtain is located and a vertical straight line. Illustratively, the target pitch angle of the optical curtain may be 0 degrees, 5 degrees, etc.

Wherein, two lateral walls that the base includes all have first guide way, and like this, the both ends of guide roll pass corresponding first guide way respectively to fixed to the guide roll.

Furthermore, two ends of the guide roller can be respectively provided with a fixing nut, and each fixing nut is tightly pressed on the supporting plate close to the end part of the guide roller after being screwed. Of course, two fixing nuts may be provided at each end of the guide roller, and the two fixing nuts at each end are respectively pressed against both sides of the support plate near the end.

It should be noted that, when the guide roller is a roller-type guide roller in the above-mentioned embodiment, after the guide roller is controlled to stop moving, both ends of the central shaft included in the guide roller may be fixed in the first guide groove, so that the rotation of the hollow cylindrical drum around the central shaft may not be affected.

The shape of the first guide groove is a long strip shape or an oval shape, and of course, other shapes are also possible, as long as the guide roller can move along the length direction of the first guide groove and is fixed on the first guide groove, which is not limited in the embodiment of the present application. The width of the first guide groove may be slightly larger than the diameter or side length of the cross section of the guide roller. Thus, the guide roller can be more flexibly moved in the length direction of the first guide groove. The length of the first guide groove can be set according to the limit inclination of the optical curtain along the length direction of the first guide groove, and the length of the first guide groove can be slightly larger than the limit inclination of the optical curtain along the length direction of the first guide groove, so that when the guide roller limits the pitching angle of the optical curtain, the interference to the guide roller is avoided.

In some embodiments, the length direction of the first guide groove is a horizontal direction or a direction forming an acute angle with the horizontal direction. For example, when the guide roller moves along the length direction of the first guide groove, there may be a moving component in the horizontal direction, so that the optical curtain may be pressed or pushed in the horizontal direction, and then the included angle between the optical curtain and the vertical direction may be adjusted or eliminated, thereby realizing the limitation of the pitch angle of the optical curtain when the guide roller is pressed on the optical curtain.

It should be noted that the target pitch angle of the optical curtain may be set according to the angle of the light beam emitted by the optical engine or other factors, and further, the angle of the first guide groove may be set according to the target pitch angle of the optical curtain, as long as the guide roller capable of moving along the length direction of the first guide groove can limit the pitch angle of the optical curtain to the target pitch angle, which is not limited in the embodiment of the present application.

In some embodiments, a lubricating member closely attached to the inner wall of each first guide groove may be provided on the inner wall of each first guide groove, so that friction between the guide roller and the first guide groove may be reduced, smoothness of movement of the guide roller in the first guide groove may be enhanced, and improvement of movement accuracy of the guide roller may be facilitated.

In some embodiments, when the guide roller is in a strip-like configuration, the length direction of the guide roller is parallel to the axial direction of the crimping assembly. Therefore, the smoothness of the optical curtain can be ensured, and the phenomenon that the optical curtain is distorted due to the existence of the guide roller is avoided.

In some embodiments, the guide roller compresses the optical curtain on a side of the optical curtain proximate the lifting assembly when an intersection between the optical curtain and the curling assembly is between the first end and the second end of the lifting assembly in the horizontal direction. Like this, when the intersection line between optics curtain and the subassembly that curls was located between the first end of lifting unit and the second end, because the first side of optics curtain and the subassembly fixed connection that curls, the second side of optics curtain and the second end fixed connection of lifting unit, therefore the intersection line between optics curtain and the subassembly that curls is close to the first side of optics curtain, like this, for vertical direction, the direction slope of optics curtain orientation lifting unit. Furthermore, the guide roller positioned on one side of the optical curtain close to the lifting component can compress and push the optical curtain to enable the optical curtain to be far away from the lifting component, so that the correction of the pitching angle of the optical curtain can be realized.

The intersection line between the optical curtain and the curling assembly is a line along the length direction of the curling assembly formed by the optical curtain curled on the curling assembly at a position just leaving from the curling assembly, namely a line along the length direction of the curling assembly at the tangent position of the unfolded part of the optical curtain and the curling assembly.

It should be noted that, when the lifting assembly includes the beam, in this embodiment, the second end of the lifting assembly may be specifically a side edge of the beam, which is fixedly connected to the optical curtain. It should be further noted that the included angle between the cross beam and the horizontal plane may be changed due to the pulling force of the optical curtain, that is, the relative position of the two side edges of the cross beam along the length direction in the vertical direction may be changed due to the pulling force of the optical curtain, so that the positional relationship between the intersection line between the optical curtain and the curling assembly, and the first end and the second end of the lifting assembly may be changed due to the change of the cross beam, and thus the cross beam may affect the arrangement of the guide roller to a certain extent.

In other embodiments, when the intersection line between the optical curtain and the curling assembly is located on the side close to the second end of the lifting assembly in the horizontal direction, the guide roller presses the optical curtain on the side of the optical curtain far away from the lifting assembly. Like this, when the intersection line between optics curtain and the subassembly that curls was located the one side that is close to the second end on the lifting unit, because the first side of optics curtain and the subassembly fixed connection that curls, the second side of optics curtain and the second end fixed connection of lifting unit, therefore the intersection line between optics curtain and the subassembly that curls is close to the first side of optics curtain, like this, for vertical direction, the optics curtain inclines towards the direction of keeping away from the lifting unit. Furthermore, the guide roller positioned on one side of the optical curtain far away from the lifting component can compress and push the optical curtain to enable the optical curtain to be close to the lifting component, so that the correction of the pitching angle of the optical curtain can be realized.

It should be noted that, in the above two embodiments, the inclination of the lifting assembly is the inclination of the second end of the lifting assembly towards the direction of the optical curtain. When the inclination of the lifting component is the inclination of the direction in which the second end of the lifting component faces away from the optical curtain, the intersection line between the optical curtain and the curling component is positioned on one side close to the first end of the lifting component, and at the moment, the guide roller compresses the optical curtain on one side of the optical curtain away from the lifting component.

It should also be noted that in both of the above embodiments, the guide rollers correct the pitch angle of the optical curtain in the area between the guide rollers and the second end of the lifting assembly, and thus the guide rollers are both disposed near the curling assembly to ensure large area adjustment of the optical curtain.

In some embodiments, the guide roller may include two guide rollers, the two guide rollers are designed to be spaced apart from each other, two ends of the two guide rollers are fixedly connected to each other, and the optical curtain passes through the gap between the two guide rollers. Like this, in the horizontal direction, no matter be the condition when the intersection line between optics curtain and the subassembly that curls is located between lifting unit's first end and second end, still the condition when the intersection line between optics curtain and the subassembly that curls is located the one side that is close to lifting unit's second end, any deflector roll homoenergetic in two deflector rolls compresses tightly and promotes the optics curtain to can realize the correction to optics curtain every single move angle.

It should be noted that, when the lifting assembly is lifted to unfold the optical curtain, the curling assembly can rotate clockwise or counterclockwise, and under the condition that the position of the central axis of the curling assembly is fixed, the intersection line between the curling assembly rotating clockwise and the optical curtain and the position of the intersection line between the curling assembly rotating counterclockwise and the optical curtain are different, so the relationships between the intersection line between the optical curtain and the curling assembly, the first end of the lifting assembly and the second end of the lifting assembly are different.

Next, a case where the projection screen includes the tension mechanism will be explained in detail.

In some embodiments, the projection screen further comprises a tensioning mechanism; the tensioning mechanism is fixedly connected with the second ends of the curling assembly and the lifting assembly respectively, the lifting assembly can control the optical curtain and the tensioning mechanism to be synchronously unfolded, and the pitching angle of the optical curtain can be limited when the tensioning mechanism is unfolded; wherein the lifting assembly is positioned between the optical curtain and the tensioning mechanism.

Thus, when the optical curtain and the tensioning mechanism are in the unfolding state, because the lifting assembly is positioned between the optical curtain and the tensioning mechanism, the tension of the lifting assembly by the tensioning mechanism can be balanced with the tension of the lifting assembly by the optical curtain, and thus, the tensioning mechanism can limit the pitching angle of the optical curtain and correct the pitching angle of the optical curtain.

In some embodiments, when the lift assembly includes a cross beam, the cross beam may be a thin plate-like cross beam. The optical curtain is fixedly connected with a first side edge along the length direction on the cross beam, the tensioning mechanism is connected with a second side edge along the length direction on the cross beam, and the optical curtain and the tensioning mechanism are respectively positioned on two sides of the second supporting rod. In this way, the tensioning mechanism may balance the tension of the optical curtain to the cross-beam by tensioning the cross-beam, thereby defining the pitch angle of the optical curtain.

In some embodiments, the curling assembly is a unitary structure, and the curling assembly is located on a side of the lifting assembly adjacent to the optical curtain. In this way, the crimping assembly is capable of simultaneously tensioning the optical curtain and the tensioning mechanism to define the pitch angle of the optical curtain via the tensioning mechanism.

Of course, in other embodiments, the crimping assemblies include a first sub-crimping assembly and a second sub-crimping assembly; the first sub-curling assembly and the second sub-curling assembly are connected with the base, the first sub-curling assembly and the optical curtain are positioned on the first side of the lifting assembly, and the second sub-curling assembly and the tensioning mechanism are positioned on the second side of the lifting assembly; the optical curtain is fixedly connected to the first sub-curling assembly, and the tensioning mechanism is fixedly connected to the second sub-curling assembly.

The first sub-curling assembly can be matched with the lifting assembly to control the optical curtain to curl on the first sub-curling assembly; the second sub-crimping assembly is capable of engaging the lifting assembly to control the tensioning mechanism to crimp on the second sub-crimping assembly.

In this way, since the second sub-curling assembly can control the tensioning mechanism to curl on the second sub-curling assembly, after the optical curtain tilts forward, the second sub-curling assembly can be adjusted forward by a small amplitude to realize further curling of the tensioning mechanism, so that the tensioning force of the tensioning mechanism on the second end of the lifting assembly can be increased to adjust the pitch angle of the optical curtain. After the optical curtain leans back, the second sub-curling component is reversely adjusted by a small amplitude to realize the slight unfolding of the tensioning mechanism, so that the tensioning force of the tensioning mechanism to the second end of the lifting component can be reduced to adjust the pitching angle of the optical curtain. Similarly, when the optical curtain tilts forward or tilts backward, the first sub-curling component is adjusted by a small amplitude to adjust the pitch angle of the optical curtain, or the first sub-curling component and the second sub-curling component are adjusted by a small amplitude to adjust the pitch angle of the optical curtain.

The first sub-curling component is used for independently controlling the optical curtain, and the second sub-curling component is used for independently controlling the tensioning mechanism, so that the tensioning force of the optical curtain to the second end of the lifting component can be conveniently and independently adjusted, and the tensioning force of the tensioning mechanism to the second end of the lifting component can be independently adjusted.

In some embodiments, the take-up mechanism includes an auxiliary roller and a take-up assembly; the first end of tensioning assembly and lifting unit's second end fixed connection, tensioning assembly's second end and curling subassembly fixed connection, the both ends of auxiliary roller all are connected with the lateral wall of base, and the auxiliary roller compresses tightly on tensioning assembly.

Like this, under the cooperation of curling subassembly and lifting unit, can realize the curling or the expansion of taut subassembly, and then under the condition that the optics curtain is connected with curling subassembly and lifting unit respectively, can realize the optics curtain and the synchronous curling and the expansion of taut subassembly. In addition, because the auxiliary roller is pressed against the tensioning assembly, the tension of the tensioning assembly on the second end of the lifting assembly can be controlled.

Optionally, the auxiliary roller is in a strip structure, and the length direction of the auxiliary roller is parallel to the axial direction of the curling assembly. Like this, the auxiliary roller of strip structure is convenient for compress tightly on tensioning assembly along length direction to carry out spacing on a large scale to tensioning assembly. Further, because the length direction of the auxiliary roller is parallel to the axial direction of the curling assembly, the auxiliary roller can ensure the smoothness of the tensioning assembly, the phenomenon that the tensioning assembly is distorted due to the existence of the auxiliary roller is avoided, and the distortion of the lifting assembly is further avoided.

The cross section of the auxiliary roller is circular or polygonal, which is not limited in the embodiments of the present application. The auxiliary roller with the round cross section is convenient to process, the surface of the auxiliary roller is smooth, and the optical curtain is not easily damaged.

Optionally, the auxiliary roller has a lubricating coating, such that the lubricating coating can act as a lubrication between the auxiliary roller and the take-up assembly. Thereby relative motion between auxiliary roller and the taut subassembly can be more smooth and easy, can avoid the surface of auxiliary roller because of reasons such as unsmooth fish tail taut subassembly simultaneously to prolong taut subassembly's life. The lubricating coating may be a coating composed of flexible particles, or may be a colloidal coating, which is not limited in this application.

Optionally, the tensioning assembly is a first auxiliary cloth or a plurality of first tensioning ropes. In the case where the lifting assembly includes a thin plate-shaped cross member, when the tightening assembly is a first auxiliary cloth, one side edge of the first auxiliary cloth is fixedly connected to a second side edge of the cross member in the length direction, and the other side edge of the first auxiliary cloth, which is opposite to the one side edge, is fixedly connected to the curling assembly, so that the first auxiliary cloth tightens the lifting assembly based on the cross member. When the tensioning assembly is the first tensioning ropes, each first tensioning rope can be parallel to each other, one end of each first tensioning rope can be fixedly connected with the second side edge of the beam along the length direction, the other end of each first tensioning rope can be fixedly connected with the curling assembly, and therefore the first tensioning ropes tension the lifting assembly based on the beam.

The first auxiliary cloth is fixedly connected with the cross beam through a first screw, or fixedly connected with the cross beam through a bonding mode, and certainly can be fixedly connected with the cross beam through other modes, which is not limited in the embodiment of the application. In addition, the length of the side fixedly connected with the cross beam on the first auxiliary cloth and the length of the side fixedly connected with the cross beam on the optical curtain can be smaller than or equal to the length of the cross beam, so that the cross beam can limit the first auxiliary cloth and the optical curtain more comprehensively under the condition that the stress on the two sides of the lifting assembly is more balanced.

When the tensioning assembly is the first tensioning ropes, the plurality of fixing holes corresponding to the first tensioning ropes one to one are formed in the cross beam, each first tensioning rope is bound and connected with the cross beam based on one corresponding fixing hole, and of course, each first tensioning rope can also be fixedly connected with the cross beam in other modes, which is not limited in the embodiment of the application. Each first tensioning line is, for example, fixedly connected to the transverse member by a first screw.

The distance between every two first tensioning ropes can be equal, so that the tensioning force of each first tensioning rope to the cross beam is equal, the stability of the cross beam is guaranteed, and deflection and the like cannot occur.

It should be noted that when the crimping assembly includes the first sub-crimping assembly and the second sub-crimping assembly, the tensioning mechanism may be a second auxiliary cloth or a plurality of second tensioning ropes, in addition to the above-described structure.

When the tensioning mechanism is the second auxiliary cloth, the connection mode and the connection position of the second auxiliary cloth and the cross beam can be the same as or similar to those of the first auxiliary cloth and the cross beam, and the difference is that the second auxiliary cloth is fixedly connected with the second sub-curling assembly. When straining the mechanism and be many second taut ropes, the connected mode, the hookup location of many second taut ropes and crossbeam can be the same or similar with the connected mode, the hookup location of many first taut ropes and crossbeam, and the difference lies in, many second taut ropes and the subassembly fixed connection of the secondary curling, and this application embodiment is no longer repeated to this.

In the embodiment of the application, the auxiliary roller can be fixed or can rotate around the axis of the auxiliary roller along the length direction when the tensioning assembly is wound or unwound. That is, the both ends of auxiliary roller and the lateral wall of base are spacing to be connected, or the both ends rotatable connection of auxiliary roller is on the lateral wall of base.

In the case that the auxiliary roller can rotate, when the curling assembly curls to retract the tensioning assembly or the lifting assembly controls the tensioning assembly to be unfolded, the auxiliary roller can rotate, so that the friction force between the auxiliary roller and the tensioning assembly can be reduced, and the damage to the tensioning assembly caused by the friction between the auxiliary roller and the tensioning assembly can be prevented. Of course, to prevent friction when the crimping assembly is crimped to take up the tensioning assembly, the auxiliary roller may be moved away from the tensioning assembly to avoid direct contact of the auxiliary roller with the tensioning assembly and pressed against the tensioning assembly by the auxiliary roller after the tensioning assembly is deployed to define the pitch angle of the optical curtain.

For the case that the auxiliary roller can rotate, in some embodiments, the auxiliary roller is a rod structure, and both ends of the auxiliary roller are rotatably connected to the side wall of the base through bearings.

In other embodiments, the auxiliary roller comprises a central shaft and a roller, two ends of the central shaft are in limit connection with the side wall of the base, the roller is rotatably sleeved on the central shaft, and the roller is pressed on the tensioning assembly.

In this way, because the roller can rotate around the central shaft, when the rolling assembly collects or deploys the tensioning assembly, relative motion can be generated between the tensioning assembly and the roller, and because the roller can rotate around the central shaft, friction between the roller and the tensioning assembly can be obviously reduced, so that abrasion to the tensioning assembly is avoided, and meanwhile, the flexibility of the rolling assembly for collecting and deploying the tensioning assembly can be improved.

The end of the central shaft can be limited on the side wall of the base through the second screw, and certainly, the end of the central shaft can be limited on the side wall of the base through other modes, which is not limited in the embodiment of the application. Illustratively, the end of the central shaft is retained on the side wall of the base by a retaining nut.

In the embodiment of the application, the end part of the auxiliary roller is fixedly connected with the side wall of the base so as to realize the limit between the end part of the auxiliary roller and the side wall of the base; or the end part of the auxiliary roller is movably limited on the side wall of the base.

Wherein, for the movement of the auxiliary roller, in some embodiments, the side wall of the base has a second guide groove through which an end of the auxiliary roller passes and is movable in a length direction of the second guide groove. Thus, after the auxiliary roller is in contact with the take-up assembly and continues to move along the length of the second guide groove, the take-up assembly can be pushed. Because the first end of take-up unit and lifting unit's second end fixed connection, the second end of take-up unit and curling subassembly fixed connection, and lifting unit and curling subassembly are quiescent condition, therefore when the auxiliary roll promoted take-up unit, can increase the dynamics of compressing tightly to take-up unit tightens, like this, take-up unit has certain rising to the straining force of lifting unit's second end. Similarly, when the auxiliary roller is far away from the tensioning assembly along the length direction of the second guide groove, the pressing force of the auxiliary roller on the tensioning assembly is reduced, and the tensioning force of the tensioning assembly on the second end of the lifting assembly is reduced to some extent.

Further, the auxiliary roller can change the pitching angle of the optical curtain based on the adjustment of the compression force of the tension assembly, and when the pitching angle of the optical curtain is changed to the target pitching angle, the auxiliary roller can be controlled to stop moving and fixed, so that the limitation of the pitching angle of the optical curtain is realized. Illustratively, the optical curtain tilts forward, at this time, the tension of the optical curtain to the second end of the lifting assembly is greater than the tension of the pull-in assembly to the second end of the lifting assembly, at this time, the adjustable auxiliary roller moves in the direction away from the optical curtain along the second guide groove to adjust the auxiliary roller to further tighten the tensioning assembly, so that the tensioning assembly further tightens the second end of the lifting assembly, the tension of the optical curtain to the second end of the lifting assembly is balanced, and the inclination angle of the optical curtain is adjusted at the same time, so that the adjusted optical curtain is ensured to be at the target pitch angle.

The target pitching angle of the optical curtain is an included angle between a plane where the optical curtain is located and a vertical straight line under the condition that the optical curtain is not unnecessarily inclined. For example, the target pitch angle of the optical curtain may be degrees, or the like. The target pitch angle of the optical curtain may be set based on the angle at which the optical engine emits the light beam or other factors.

Wherein, the base includes two lateral walls, and two lateral walls all have the second guide way, and like this, the both ends of auxiliary roller pass corresponding second guide way respectively to fixed to the auxiliary roller.

Furthermore, two ends of the auxiliary roller can be respectively provided with a fixing nut, and each fixing nut is tightly pressed on the side wall close to the end part of the auxiliary roller after being screwed. Of course, two fixing nuts may be provided at each end of the auxiliary roller, and the two fixing nuts at each end are respectively pressed against both sides of the side wall near the end.

It should be noted that, when the auxiliary roller includes the central shaft and the drum, after the auxiliary roller is controlled to stop moving, both ends of the central shaft included in the auxiliary roller may be fixed in the second guide grooves, so that the movement of the auxiliary roller may be avoided while ensuring the relative rotation between the auxiliary roller and the optical film.

The shape of the second guide groove may be a long strip shape or an oval shape, and of course, other shapes may also be used, as long as the auxiliary roller can move along the length direction of the second guide groove and is fixed on the second guide groove, which is not limited in the embodiment of the present application. The width of the second guide groove may be slightly greater than the diameter or side length of the cross section of the auxiliary roller. Thus, the auxiliary roller can be more flexibly moved in the length direction of the second guide groove.

In some embodiments, the length direction of the second guide groove is a horizontal direction or a direction forming an acute angle with the horizontal direction. For example, when the auxiliary roller moves along the length direction of the second guide groove, a movement component can be arranged in the horizontal direction, so that the relative position relationship of the contact position of the tensioning assembly and the auxiliary roller, the first end of the tensioning assembly and the second end of the tensioning assembly in the horizontal direction can be adjusted, and the adjustment of the pressing force of the auxiliary roller on the tensioning assembly is realized.

In some embodiments, a lubricating member closely attached to the inner wall of each second guide groove may be provided on the inner wall of each second guide groove, so that friction between the auxiliary roller and the second guide groove may be reduced, smoothness of movement of the auxiliary roller in the second guide groove may be enhanced, and improvement of movement accuracy of the auxiliary roller may be facilitated.

In some embodiments, the projection screen further comprises a control mechanism, the control mechanism is in transmission connection with the auxiliary roller, and the control mechanism is used for driving the auxiliary roller to move along the length direction of the second guide groove. Like this, can realize the automatic control that the auxiliary roller removed, and can guarantee the amount of movement and the removal precision of auxiliary roller, further can guarantee the accurate control of auxiliary roller to the dynamics of compressing tightly of take-up assembly to the every single move angle of injecing the optics curtain more accurately. Of course, the amount of movement of the auxiliary roller may be adjusted manually as long as the adjustment of the auxiliary roller is facilitated, and the embodiment of the present application is not limited thereto.

Wherein the control assembly may include a motor, a rotating member, and an adjustment screw, wherein the motor and the rotating member may be directly fixed to the base. The rotating part is in transmission connection with an output shaft of the motor, one end of the adjusting screw is fixedly connected with the rotating part along the axial direction of the rotating part, and the adjusting screw is in threaded connection with the auxiliary roller. Of course, the motor, the rotating part and the adjusting screw can be connected in other modes, and the auxiliary roller can be driven to move along the length direction of the second guide groove.

Thus, the motor receives the control command, and the output shaft of the motor can rotate based on the control command, thereby driving the rotating member to rotate together. Because one end of the adjusting screw is fixedly connected with the rotating piece along the axial direction of the rotating piece, the adjusting screw can be driven to rotate together when the rotating piece rotates. Thus, when the adjusting screw rotates, the auxiliary roller in threaded connection with the adjusting screw can move along the axial direction of the adjusting screw, so that the adjustment of the auxiliary roller can be realized.

Wherein, the motor is connected with the controller electricity to it is long when the start-up of motor is controlled through the controller, thereby guarantees that the motor passes through rotating member and adjusting screw and realizes the accurate removal of auxiliary roller. The motor may be a speed reduction motor, and may of course be other motors, which is not limited in this application.

When the auxiliary roller and the tensioning assembly adjust the pitching angle of the optical curtain to the target pitching angle, the controller can send a stop instruction to the motor to control the motor to stop running, and then the rotating part and the adjusting screw can stop moving, so that the auxiliary roller can be limited on the motionless adjusting screw, and then the auxiliary roller can be kept fixed, and the limitation on the pitching angle of the optical curtain can be realized.

Wherein the rotating member may be a gear assembly, which may include a first gear and a second gear, the first gear and the second gear being intermeshed. The first gear can be fixedly connected with an output shaft of the motor along the axial direction, the second gear is axially limited on the base, and can be driven by the motor to synchronously rotate with the first gear. The second gear is fixedly connected with one end of the adjusting screw along the axial direction, so that the adjusting screw can be driven to rotate together when the second gear rotates. Of course, the rotating member may also be a belt transmission assembly or other types of transmission assemblies as long as the power output by the motor can be transmitted to the adjusting screw, so as to rotate the adjusting screw in situ, which is not limited in the embodiment of the present application.

The control assembly can control the auxiliary roller to slide in the second guide groove, and limit the auxiliary roller on the adjusting screw after controlling the auxiliary roller to slide after stopping, so that the auxiliary roller stops moving.

In addition, the auxiliary roller may also be moved in a rolling manner within the second guide groove. In order to enable the auxiliary roller to roll in the second guide groove, the auxiliary roller may be manually adjusted, or of course, other control assemblies may be used to adjust the auxiliary roller, which is not limited in the embodiments of the present application. Furthermore, two ends of the auxiliary roller can be manually provided with a fixing nut respectively, and each fixing nut is screwed so that each fixing nut is pressed on the side wall close to the end part of the auxiliary roller respectively to realize the fixation of the auxiliary roller. Of course, it is also possible to manually provide two fixing nuts at each end of the auxiliary roller, and to press the two fixing nuts at each end against the two sides of the side wall near the end, respectively.

In the embodiment of the present application, the curling assembly 22 includes a curling controller, a curling motor and a winding drum, the curling controller is electrically connected to the curling motor, the curling motor can be fixed on the base 21, an output shaft of the curling motor is fixedly connected to an end of the winding drum, and the optical curtain 24 is fixedly connected to the winding drum. Wherein, the start-stop of curling motor can be controlled to the controller that curls, can drive the reel rotation after the curling motor starts. Thus, the optical curtain 24 can be controlled to be wound on the roll while the roll controller controls the roll to rotate.

When realizing the fixed of optics curtain 24 and reel, the outer wall of reel is provided with the draw-in groove along the axial, is provided with the card strip that matches with the draw-in groove on one side of optics curtain 24, and the card strip can be followed the radial spacing in the draw-in groove of reel to can realize that optics curtain 24 is along the circumferencial direction's of reel spacing.

Therefore, when the winding drum rotates, the optical curtain 24 and the winding drum can be synchronously curled through the limit of the clamping strip, and the optical curtain 24 can be curled on the winding drum. And because the spacing of card strip, can make the reel provide certain pulling force to a side of optical curtain 24, this pulling force can mutually support under the effect when expanding with a side of leading relative with a side of optical curtain 24, makes optical curtain 24 more level and more smooth to improve optical curtain 24's display effect.

It should be noted that, when the tensioning mechanism includes the tensioning assembly, and the tensioning assembly is the first auxiliary cloth, the first auxiliary cloth is connected to the curling assembly 22 in the same or similar manner as the optical curtain 24 is connected to the curling assembly 22. When the curling assembly 22 includes a first sub-curling assembly and a second sub-curling assembly, the structures of the first sub-curling assembly and the second sub-curling assembly are the same as the structure of the curling assembly 22, and when the tensioning mechanism is a second auxiliary cloth, the connection manner of the second auxiliary cloth and the second sub-curling assembly may be the same as the connection manner of the optical curtain 24 and the curling assembly 22, and of course, the connection manner of the optical curtain 24 and the first sub-curling assembly may also be the same as the connection manner of the optical curtain 24 and the curling assembly 22, which is not described again in this application.

In this embodiment, the lifting assembly 23 further includes a lifting controller and a lifting motor, the lifting controller is electrically connected to the lifting motor, and the lifting motor is fixed on the base 21. The lift controller can control the start and stop of the lift motor, and the lift motor can adjust the distance between the second end of the second support rod 232 and the crimping assembly 22.

Thus, after the lifting controller controls the lifting motor to start, the lifting motor can drive the bracket to ascend, and then the second end of the second support rod 232 included in the bracket can drive the optical curtain 24 to ascend, and at this time, the curling component 22 can control the optical curtain 24 to rotate reversely, and at the same time, the optical curtain 24 can be unfolded. In addition, when the lifting motor drives the bracket to descend, the optical curtain 24 can be driven to descend, and at this time, the optical curtain 24 can be retracted while the optical curtain 24 controlled by the curling assembly 22 rotates in the forward direction.

In some embodiments, the back surface of the optical curtain 24, that is, the surface of the optical curtain 24 facing the lifting assembly 23, is provided with a protective coating, so that when the optical curtain 24 is in a curled state, the back surface of the optical curtain 24 directly contacts with the front surface of the optical curtain 24, and therefore, the protective coating can prevent the back surface and the front surface of the optical curtain 24 from rubbing against each other to cause abrasion of the optical curtain 24, thereby prolonging the service life of the optical curtain 24.

The protective coating may be a coating composed of flexible particles, or may be a colloidal coating, which is not limited in the embodiment of the present application. The protective coating can be made of a nano material, the nano material has good toughness, impact resistance and thermal stability, and after the protective coating is contacted with the optical curtain 24, the flatness, wind resistance and stability of the optical curtain 24 can be improved, and the service life of the optical curtain 24 can be prolonged.

In the embodiment of the present application, the optical curtain 24 includes an optical film. Of course, the optical curtain 24 may also include both optical films and flexible carriers; the optical membrane is adhered to the flexible carrier, the first side of the flexible carrier is fixedly connected with the curling assembly 22, and the curling assembly 22 can control the flexible carrier to curl on the curling assembly 22; the second side opposite to the first side on the flexible carrier is rotatably connected with the second end of the second support rod 232, the flexible carrier can be controlled by the plurality of groups of supports to be unfolded, and the optical film is supported to be in a flat state when the flexible carrier is unfolded. The optical film is used for reflecting the light beam emitted by the optical engine 1 to display the picture.

Thus, when the lifting assembly 23 and the curling assembly 22 indirectly tension the optical membrane through the flexible carrier, the flexible carrier can bear part of the tension force of the lifting assembly 23 and the curling assembly 22, so that the optical membrane is not easy to damage, and the smoothness of the optical membrane can be ensured.

Wherein, the flexible carrier can be a carrier which is convenient to curl and has bearing strength, such as synthetic cloth, a film and the like. When the flexible carrier is a synthetic cloth, the material of the flexible carrier may be a synthetic material containing nylon. Because the nylon material has high mechanical strength, good toughness and higher tensile strength and compressive strength, the flexible carrier is not easy to deform when being tensioned by the lifting component 23 and the curling component 22, and the surface is smooth, thereby improving the smoothness of the optical diaphragm. Of course, the material of the flexible carrier may be other materials, which is not limited in the embodiments of the present application.

Wherein, all can bond through double faced adhesive tape or glued membrane etc. between optical film and the flexible carrier, certainly also can bond through other modes, and this application embodiment does not limit to this.

In some embodiments, the projection screen 2 may further include a rollable substrate, the optical film is adhered to the rollable substrate, and a plurality of ribs may be disposed on a side of the rollable substrate away from the optical film, wherein a length direction of each rib is not parallel to a longitudinal direction of the rollable substrate. The crimpable substrate is fixedly attached to crimping assembly 22 and crimping assembly 22 is capable of controlling the crimping of the crimpable substrate to crimping assembly 22. The rollable substrate is further rotatably connected to the second end of the second support rod 232, the plurality of sets of supports can unfold the rollable substrate, and the lifting assembly 23 is combined with the rolling assembly 22 to tension the rollable substrate, so that the optical film is supported in a flat state when the rollable substrate is unfolded.

Thus, the plurality of reinforcing ribs can enhance the strength of the rollable substrate, facilitate the rolling of the rollable substrate, and enable the rollable substrate to be stressed uniformly in the transverse direction when the rollable substrate is in a flat state, and be not easy to have ripples and wrinkles. Because the optical film is adhered to the rollable substrate, the optical film is not easy to wrinkle and deform, and the display effect of the optical film can be improved.

In some embodiments, projection screen 2 includes both a rollable substrate to which the optical film is attached and a flexible carrier to which a side of the rollable substrate remote from the optical film is attached, a first side of the flexible carrier being fixedly attached to rolling assembly 22, and rolling assembly 22 being capable of controlling the rolling of the flexible carrier on rolling assembly 22. The second side opposite to the first side on the flexible carrier is fixedly connected with the lifting assembly 23, the lifting assembly 23 can unfold the flexible carrier, and the lifting assembly 23 is combined with the curling assembly 22 to tension the flexible carrier, so that the optical film and the curlable substrate are supported to be in a flat state when the flexible carrier is unfolded.

In the embodiment of the present application, as shown in fig. 8, the projection apparatus further includes a base 3, where the base 3 is used for accommodating the optical engine 1 and the projection screen 2, and when the projection screen 2 is in the unfolded state, the optical engine 1 and the projection screen 2 have a fixed preset distance. Thus, when the projection device is not used, the optical engine 1 and the projection screen 2 can be accommodated in the base 3, which is convenient for saving space. When the projection apparatus is in a use state, the projection screen 2 may be unfolded, and the optical engine 1 may project a light beam onto the projection screen 2 so that the projection screen 2 displays an image. And the base 3 can keep a fixed preset distance between the optical engine 1 and the projection screen 2, thereby keeping a preset projection ratio.

It should be noted that, when the projection screen 2 includes the optical curtain 24, the curling component 22 and the lifting component 23, the optical curtain 24, the curling component 22 and the lifting component 23 can be all received in the base 3, and the optical curtain 24 and the lifting component 23 can also be unfolded at the same time. When the projection screen 2 includes other structures, the other structures may be received in the base 3 and may also be deployed simultaneously.

In some embodiments, the base 3 may include a first accommodating portion and a second accommodating portion, the optical engine 1 is disposed in an inner cavity of the first accommodating portion, the first accommodating portion is provided with a light-transmitting area, and the light beam emitted from the optical engine 1 can pass through the light-transmitting area. The curling assembly 22 and the lifting assembly 23 may be disposed in the inner cavity of the second receiving portion, and the curling assembly 22 and the lifting assembly 23 can control the optical curtain 24 to be retracted into the second receiving portion. The second accommodating portion is provided with an opening, and the curling assembly 22 and the lifting assembly 23 can control the optical curtain 24 to extend out of the opening and unfold. The optical curtain 24 is capable of receiving the light beam transmitted through the transparent region after being unfolded.

In the embodiment of the application, when the projection device is not used, the optical curtain can be folded by the curling component, and the occupied space of the projection screen can be further reduced. When using projection equipment, because between the first end of first bracing piece and the base, between the second end of first bracing piece and the first end of second bracing piece to and be rotatable coupling between the second end of second bracing piece and the optics curtain, therefore be favorable to folding and the extension of every group support, and then can control the optics curtain and expand when every group support extends, can cooperate when every group support is folding to curl the subassembly and curl in order to pack up the optics curtain. When the optics curtain is in the expansion state, owing to the relative position of the second end of adjustable first bracing piece and the first end of second bracing piece through first adjustment mechanism, and then the inclination of adjustment second bracing piece, owing to the second end and the optics curtain of second bracing piece are connected to the every single move angle of optics curtain can be adjusted. In this way, the tilt angle of the optical curtain can be corrected. Furthermore, because the guide roller can be pressed on the optical curtain and limit the pitching angle of the optical curtain, the optical curtain can be limited to the correct position through the guide roller, and then the problems of distortion, fuzzy distortion and the like of the picture displayed on the optical curtain can be avoided, thereby improving the display effect of the projection screen. In addition, the base can accommodate the optical engine and the projection screen, so that the occupied space can be reduced when the projection device is not used.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.