阅读说明：本技术 投影光机 (Projection light machine ) 是由 王帅 赵云 于 2021-06-30 设计创作，主要内容包括：本发明公开一种投影光机,包括：投影成像系统、第一镜头组、第二镜头组、反射镜以及驱动装置,投影成像系统用于发射投影光束；第一镜头组设于投影成像系统的出射端；第二镜头组设于投影成像系统的出射端,且第二镜头组的光轴与第一镜头组的光轴交叉设置；反射镜用于对投影光束进行反射；驱动装置包括直线驱动模组和导轨,反射镜可滑动地设于导轨上,直线驱动模组用于驱动反射镜沿导轨移动,以使投影光束透过第一镜头组射出或透过第二镜头组射出。本发明技术方案能够通过自动调整反射镜的位置,实现墙面投影或桌面投影的双功能,满足用户不同的使用需求。(The invention discloses a projection optical machine, comprising: the projection imaging system is used for emitting a projection light beam; the first lens group is arranged at the emergent end of the projection imaging system; the second lens group is arranged at the emergent end of the projection imaging system, and the optical axis of the second lens group is crossed with the optical axis of the first lens group; the reflector is used for reflecting the projection light beam; the driving device comprises a linear driving module and a guide rail, the reflector is slidably arranged on the guide rail, and the linear driving module is used for driving the reflector to move along the guide rail so as to enable the projection light beam to be emitted through the first lens group or the second lens group. According to the technical scheme, the double functions of wall projection or desktop projection can be realized by automatically adjusting the position of the reflector, and different use requirements of users are met.)

1. A projection light engine, comprising:

a projection imaging system for emitting a projection beam;

the first lens group is arranged at the emergent end of the projection imaging system;

the second lens group is arranged at the emergent end of the projection imaging system, and the optical axis of the second lens group is crossed with the optical axis of the first lens group;

a mirror for reflecting the projection beam;

the driving device comprises a linear driving module and a guide rail, the reflector is slidably arranged on the guide rail, and the linear driving module is used for driving the reflector to move along the guide rail so as to enable the projection light beam to penetrate through the first lens group or penetrate through the second lens group.

2. The light engine of claim 1, wherein the linear drive module comprises:

the screw rod is arranged in parallel with the guide rail;

the nut is sleeved on the screw rod and fixedly arranged with the reflector;

and the output end of the rotary driving piece is connected with the screw rod so as to drive the reflector to move along the guide rail through the nut.

3. The light engine of claim 2, wherein the drive means further comprises:

the supporting plate is attached to the reflector, and the supporting plate is connected with the guide rail in a sliding mode and fixedly connected with the nut.

4. The projection optical engine of any of claims 1 to 3 wherein the optical axis of the first lens group coincides with the optical axis of the projection beam;

when the reflector is at the first position, the projection light beam is emitted out through the first lens group; when the reflector is at the second position, the projection beam mirror is reflected by the reflector and then emitted out through the second lens group.

5. The light engine of claim 4, wherein the mirror is a total reflection mirror;

or, the reflector is a half-mirror, and when the half-mirror is in the second position, the projection beam is transmitted by the half-mirror and then is emitted out through the first lens group.

6. The light engine of claim 5, wherein the drive means further comprises:

the first sensed piece is fixedly arranged on the reflector;

the second sensed piece is fixedly arranged on the reflector;

the first sensor is arranged on one side of the reflector, and when the reflector is located at the first position, the first sensed piece is located in the sensing range of the first sensor;

and when the reflector is at the second position, the second sensed part is positioned in the sensing range of the second sensor.

7. The optical engine of claim 6, wherein the first sensor comprises a first emitting end and a first receiving end disposed opposite to each other, and a first sensing slot is formed between the first emitting end and the first receiving end; when the reflector is at the first position, the first sensed piece is positioned in the first sensing groove;

the second inductor comprises a second transmitting end and a second receiving end which are oppositely arranged, and a second induction groove is formed between the second transmitting end and the second receiving end; when the reflector is at the second position, the second sensed piece is positioned in the second sensing groove.

8. The optical engine according to claim 4, wherein the number of the reflectors is two, and the reflectors are a total reflection reflector and a semi-transmission reflector, and the total reflection reflector and the semi-transmission reflector are arranged along the extending direction of the screw;

when the total reflection mirror is at the second position, the semi-transparent semi-reflection mirror is at the first position; when the semi-transmitting semi-reflecting mirror is at the second position, the total reflecting mirror is at the first position; or, the total reflection mirror and the semi-transparent semi-reflection mirror are both positioned at the first position.

9. The light engine of claim 8, wherein the drive means further comprises:

the third sensed piece is fixedly arranged on the total reflection mirror;

the fourth sensed piece is fixedly arranged on the half-reflecting and half-transmitting mirror;

the third sensor is arranged on one side of the total reflection mirror, and when the total reflection mirror is located at the second position, the third sensed part is located in the sensing range of the third sensor;

and the fourth inductor and the third inductor are arranged side by side along the direction perpendicular to the extending direction of the screw rod, and when the semi-transparent and semi-reflective mirror is at the second position, the fourth inductor is positioned in the induction range of the fourth inductor.

10. The projection optical machine of any of claims 1 to 3, wherein the optical axis of the first lens group, the optical axis of the second lens group and the optical axis of the projection beam intersect at the same point;

the number of the reflectors is two, the reflectors are respectively a first reflector and a second reflector, and the first reflector and the second reflector are arranged along the extension direction of the screw rod;

when the first reflector is in the third position, the projection light beam is reflected by the first reflector and then emitted out through the first lens group; when the second reflector is at the fourth position, the projection beam mirror is reflected by the second reflector and then emitted out through the second lens group.

Technical Field

The invention relates to the field of projection equipment, in particular to a projection optical machine.

Background

With the development of the micro projector technology, the home projectors are increasingly coming into the field of vision of people and are moving toward miniaturization and portability. At present, the application of the household projector mainly comprises two aspects of audio-visual entertainment and education and teaching. The projector for audio-video entertainment generally has a larger projection ratio, and the projector with the larger projection ratio has higher cost performance because the design difficulty and the manufacturing cost of the projector are relatively lower; the projector used for the aspect of education and teaching generally adopts a desktop projection mode, 20 cm of pictures are projected on a desktop at the height of about 40 cm, and the required projection is small at the moment.

Along with the increase of user's demand, the user needs to use the audio-visual amusement function of projector under some circumstances, needs to use the educational and teaching function of projector under other circumstances, for this reason, the user can only purchase the projector of two kinds of different functions simultaneously, and this kind of mode occupies space, resource-wasting, and it is not convenient enough to use two times. Therefore, it is increasingly difficult for a single-function projector to meet the needs of modern users.

Disclosure of Invention

The invention mainly aims to provide a projection light machine, aiming at realizing the double functions of wall surface projection or desktop projection by automatically adjusting the position of a reflector and enabling a projection light beam to be emitted out through a first lens group or a second lens group, and meeting different use requirements of users.

In order to achieve the above object, the invention provides a projection light engine, comprising: the projection imaging system is used for emitting a projection light beam; the first lens group is arranged at the emergent end of the projection imaging system; the second lens group is arranged at the emergent end of the projection imaging system, and the optical axis of the second lens group is crossed with the optical axis of the first lens group; the reflector is used for reflecting the projection light beam; the driving device comprises a linear driving module and a guide rail, the reflector is slidably arranged on the guide rail, and the linear driving module is used for driving the reflector to move along the guide rail so as to enable the projection light beam to penetrate through the first lens group or penetrate through the second lens group.

Optionally, the linear driving module comprises: the screw rod is arranged in parallel with the guide rail; the nut is sleeved on the screw and fixedly arranged with the reflector; the output end of the rotary driving piece is connected with the screw rod so as to drive the reflector to move along the guide rail through the nut.

Optionally, the driving device further comprises: the supporting plate is attached to the reflector, and the supporting plate is connected with the guide rail in a sliding mode and fixedly connected with the nut.

Optionally, an optical axis of the first lens group coincides with an optical axis of the projection beam; when the reflector is at the first position, the projection light beam is emitted out through the first lens group; when the reflector is at the second position, the projection beam mirror is reflected by the reflector and then emitted out through the second lens group.

Optionally, the mirror is a total reflection mirror; or, the reflector is a half-mirror, and when the half-mirror is in the second position, the projection beam is transmitted by the half-mirror and then is emitted out through the first lens group.

Optionally, the driving device further comprises: the first sensed piece is fixedly arranged on the reflector; the second sensed piece is fixedly arranged on the reflector; the first sensor is arranged on one side of the total reflection mirror, and when the reflection mirror is located at the first position, the first sensed piece is located in the sensing range of the first sensor; the second inductor and the first inductor are arranged side by side along the extending direction perpendicular to the screw rod, and when the reflector is located at the second position, the second induced part is located in the induction range of the second inductor.

Optionally, the first inductor includes a first transmitting end and a first receiving end that are arranged oppositely, and a first induction slot is formed between the first transmitting end and the first receiving end; when the reflector is at the first position, the first sensed piece is positioned in the first sensing groove; the second inductor comprises a second transmitting end and a second receiving end which are oppositely arranged, and a second induction groove is formed between the second transmitting end and the second receiving end; when the reflector is at the second position, the second sensed piece is positioned in the second sensing groove.

Optionally, the number of the reflectors is two, one of the reflectors is a total reflection reflector, the other reflector is a semi-transparent semi-reflective reflector, and the total reflection reflector and the semi-transparent semi-reflective reflector are arranged in an array along the extending direction of the screw; when the total reflection mirror is at the second position, the semi-transparent semi-reflection mirror is at the first position; when the semi-transmitting semi-reflecting mirror is at the second position, the total reflecting mirror is at the first position; or, the total reflection mirror and the semi-transparent semi-reflection mirror are both positioned at the first position.

Optionally, the driving device further comprises: the third sensed piece, the fourth sensed piece, the third sensor and the fourth sensor are fixedly arranged on the total reflection mirror; the fourth sensed piece is fixedly arranged on the semi-reflecting and semi-transmitting mirror; the third sensor is arranged on one side of the total reflection mirror, and when the total reflection mirror is at the second position, the third sensed part is positioned in the sensing range of the third sensor; the fourth inductor and the third inductor are arranged side by side along the extending direction perpendicular to the screw rod, and when the half-transmitting and half-reflecting mirror is located at the second position, the fourth inductor is located in the induction range of the fourth inductor.

Optionally, the optical axis of the first lens group, the optical axis of the second lens group and the optical axis of the projection beam intersect at the same point; the number of the reflectors is two, the reflectors are respectively a first reflector and a second reflector, and the first reflector and the second reflector are arranged along the extension direction of the screw rod; when the first reflector is in the third position, the projection light beam is reflected by the first reflector and then emitted out through the first lens group; when the second reflector is at the fourth position, the projection beam mirror is reflected by the second reflector and then emitted out through the second lens group.

In the technical scheme of the invention, a driving device and a reflector are arranged between a projection imaging system and a first lens group/a second lens group, the driving device comprises a linear driving module and a guide rail, the reflector is slidably arranged on the guide rail, the reflector is driven to move along the guide rail by the linear driving module, the automatic adjustment of the movement of the reflector can be realized, whether the projection light beam is reflected or the reflection angle of the projection light beam is determined by the position change of the reflector, the projection light beam is emitted out through the first lens group or the second lens group, thereby achieving the effect of wall surface projection or desktop projection, realizing the double functions of wall surface projection or desktop projection on the same projection optical machine, meeting the use requirements of users on two aspects of audio-visual entertainment and education teaching, and the first lens group and the second lens group share one set of projection imaging system, the projector can effectively reduce the whole volume of the projector, and has simple and compact structure and flexible and convenient use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a projection optical system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a driving device of the optical projection engine of FIG. 1;

FIG. 3 is a schematic diagram of a projection light engine with a mirror in a first position;

FIG. 4 is a schematic diagram of a projection light engine with a mirror in a second position;

FIG. 5 is a schematic diagram of a projection optical system according to another embodiment of the present invention with a total reflection mirror in a second position;

FIG. 6 is a schematic structural diagram of a projection optical system according to another embodiment of the present invention with the half-mirror at a second position;

FIG. 7 is a schematic diagram of a bare optical projection engine in a second position according to another embodiment of the present invention;

fig. 8 is a schematic structural diagram of a projection optical machine according to another embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides a projection light machine 100.

In an embodiment of the present invention, as shown in fig. 1 to 2, the optical projector 100 includes: a projection imaging system 10, a first lens group 20, a second lens group 30, a mirror 40 and a driving device 50, the projection imaging system 10 being for emitting a projection light beam; the first lens group 20 is arranged at the exit end of the projection imaging system 10; the second lens group 30 is disposed at the exit end of the projection imaging system 10, and the optical axis of the second lens group 30 intersects with the optical axis of the first lens group 20; the reflector 40 is used for reflecting the projection light beam; the driving device comprises a linear driving module and a guide rail 55, the reflector 40 is slidably disposed on the guide rail 55, and the linear driving module is used for driving the reflector 40 to move along the guide rail, so that the projection beam is emitted through the first lens group 20 or the second lens group 30.

Specifically, the focal length of the first lens group 20 is between 25 mm and 30 mm, and the focal length of the second lens group 30 is between 3.2 mm and 3.5 mm, that is, the first lens group 20 is a long-focus lens group, and the second lens group 30 is a short-focus lens group. At this time, the focal length of the first lens group 20 is different from the focal length of the second lens group 30, and the projection ratio of the first lens group 20 and the second lens group 30 when imaging the projection light beam is different, so that different projection effects can be realized. Of course, the first lens group 20 can be set as a short focal lens group, and the second lens group 30 can be set as a long focal lens group, but the invention is not limited thereto, and the focal lengths of the first lens group 20 and the second lens group 30 can be set according to actual needs. For convenience of description, the first lens group 20 is exemplified as a long focus lens group and the second lens group 30 is exemplified as a short focus lens group. The detailed structures of the projection imaging system 10, the first lens group 20 and the second lens group 30 can be implemented by the prior art, and are not described herein again.

It will be readily appreciated that the mirror 40 may reflect the projection beam exiting the projection image, thereby changing the direction of propagation of the projection beam. Meanwhile, the reflector 40 can move relative to the projection imaging system 10 to determine whether to reflect the projection beam or determine the reflection angle of the projection beam, so as to select the projection beam to be emitted through the first lens group 20 or the second lens group 30. Wherein, because the focal length of the first lens group 20 is longer, when the projection light beam is emitted through the first lens group 20, the projection ratio of the optical imaging is larger, at this time, the optical imaging can be projected on the wall surface for the video entertainment; the second lens group 30 has a short focal length, so that when the projection beam is emitted through the second lens group 30, the projection of the optical image is small, and at this time, the optical image can be projected on a desktop for educational teaching.

In this embodiment, the movement of the mirror 40 is controlled by a driving device 50. Specifically, the optical projection engine 100 further includes a housing (not shown), the projection imaging system 10, the first lens group 20, and the second lens group 30 are all fixed in the housing, the linear driving module and the guide rail 55 are also installed in the housing, the linear driving module can adopt a combination of a motor and a lead screw, a combination of a motor and a belt transmission, a linear cylinder, etc., the linear driving module can drive the mirror to slide along the guide rail 55, and the guide rail 55 can ensure a moving path of the mirror 40, so that the mirror can accurately move according to a preset path. By moving the reflector to different positions, the projection beam can be selected to be emitted through the first lens group 20 or emitted through the second lens group 30, and finally the effect of wall projection or desktop projection is realized.

In an embodiment of the present invention, the linear driving module includes: a screw 52, a nut 53 and a rotary drive 51, wherein the screw 52 is arranged in parallel with the guide rail 55; the nut 53 is sleeved on the screw 52 and is fixedly arranged with the reflector 40; the output end of the rotary driving member 51 is connected to the screw 52, so as to drive the reflector 40 to move along the guide rail 55 through the nut 53.

Specifically, the rotary driving element 51 is fixed in the housing, the rotary driving element 51 may be a motor or a rotary cylinder, etc., an output shaft of the rotary driving element 51 may be fixedly connected to the screw 52 through a coupler, the reflector 40 is disposed parallel to the screw 52, and the reflector 40 is fixedly disposed with the nut 53 on the screw 52. When the rotary driving member 51 drives the screw 52 to rotate, the nut 53 is driven to move along the extending direction of the screw 52 through the engagement between the external thread of the screw 52 and the internal thread of the nut 53, so as to drive the reflector 40 to move along the guide rail 55, and realize the translational motion of the reflector 40.

In an embodiment of the present invention, referring to fig. 1 to 2, the driving device 50 further includes: and the supporting plate 54 is attached to the reflector 40, and the supporting plate 54 is slidably connected with the guide rail 55 and fixedly connected with the nut 53.

In this embodiment, a support plate 54 is additionally provided to avoid damage to the structure of the reflector 40 when other components are provided. The supporting plate 54 is arranged in parallel with the screw 52, the supporting plate 54 is fixedly provided with a connecting block 541, the supporting plate 54 is fixedly connected with the nut 53 through the connecting block 541, and the connecting block 541 and the supporting plate 54 can be integrally formed; meanwhile, a guide hole corresponding to the guide rail 55 is formed in the support plate 54, and the support plate 54 is sleeved on the guide rail 55 through the guide hole; and the reflecting mirror 40 is attached to the surface of the support plate 54. Thus, when the screw 52 is driven to rotate by the rotary driving member 51, the guide rail 55 can limit the rotation of the support plate 54, and the nut 53 moves along the screw 52 to drive the support plate 54 to move along the guide rail 55, so that the reflector 40 can move synchronously along with the support plate 54, thereby ensuring effective control of the movement of the reflector 40, and the support plate 54 can also enhance the structural strength of the reflector 40.

Further, referring to fig. 1 to 2, the number of the guide rails 55 is plural, and the plural guide rails 55 are symmetrically disposed on two sides of the screw 52.

In this embodiment, in order to further improve the moving stability of the reflecting mirror 40, a plurality of guide rails 55 are symmetrically disposed on both sides of the screw 52, guide holes are respectively formed in the support plate 54 corresponding to each guide rail 55, and the support plate 54 is sleeved on the corresponding guide rail 55 through each guide hole. Thus, the two sides of the screw 52 are provided with the corresponding guide rails 55 to limit, support and guide the supporting plate 54, so that the supporting plate 54 and the reflector 40 on the supporting plate 54 can be effectively ensured to move stably.

In an embodiment of the present invention, referring to fig. 1 to 4, an optical axis of the first lens group 20 coincides with an optical axis of the projection beam; when the reflector 40 is at the first position, the projection beam is emitted through the first lens group 20; when the reflector 40 is at the second position, the projection beam mirror is reflected by the reflector 40 and then exits through the second lens group 30.

In this embodiment, for the convenience of moving, the extension direction of the screw 52 is perpendicular to the plane of the optical axis of the first lens group 20 and the optical axis of the second lens group 30, and the plane of the reflector 40 is perpendicular to the symmetry center line of the optical axis of the first lens group 20 and the optical axis of the second lens group 30. Thus, when the screw 52 is driven by the rotary driving member 51 to rotate and the supporting plate 54 and the reflector 40 on the supporting plate 54 are driven by the nut 53 to move, the reflector 40 moves into the second position or moves out to the first position from the direction perpendicular to the plane where the optical axis of the first lens group 20 and the optical axis of the second lens group 30 are located. Of course, the moving direction of the reflector 40 can be adjusted according to the shape and size of the housing space.

In this technical solution, the first position of the reflector 40 can be flexibly set, and as long as the reflector 40 does not block the light path through which the projection light beam passes when being transmitted through the first lens group, the relevant position can be included in the range of the first position (of course, the movable range of the reflector 40 is limited in the extending direction of the screw 52); when the reflector 40 is at the first position, the projection beam is directly emitted through the first lens group 20 without passing through the reflector 40. The second position of the reflector 40 is relatively fixed, the second position is the position where the reflector 40 reflects the projection light beam to the second lens group 30, the second position should be the position where the reflector 40 is located at the intersection of the optical axis of the first lens group 20 and the optical axis of the second lens group 30, and the plane of the reflector 40 is perpendicular to the symmetrical center line of the optical axis of the first lens group 20 and the optical axis of the second lens group 30; when the reflector 40 is at the second position, the projection beam irradiates on the reflector 40, and the propagation path of the projection beam is turned by the reflection of the reflector 40, so as to be emitted through the second lens group 30. It is understood that the intersection point of the optical axis of the first lens group 20 and the optical axis of the second lens group 30 should be located between the exit end of the projection imaging system 10 and the first lens group 20.

As an alternative embodiment, the mirror 40 is a total reflection mirror 41; or, the reflector 40 is a half mirror 42, and when the half mirror 42 is in the second position, the projection light beam is further transmitted by the half mirror 42 and then emitted through the first lens group 20.

The mirror 40 can be divided into a total reflection mirror 41 (100% reflection) or a half reflection mirror 42 (also called a spectroscope or a beam splitter, X% transmission, 100-X% reflection) according to the degree of reflection of the mirror 40. When the set reflector 40 is the total reflection mirror 41, the optical projector 100 has the dual functions of wall projection or desktop projection, and the user can select one of the functions to use as required: specifically, when the driving device 50 controls the total reflection mirror 41 to move to the first position, the wall surface projection effect can be realized; when the driving device 50 controls the total reflection mirror 41 to move to the second position, the effect of desktop projection can be achieved. When the reflector 40 is a half mirror 42, the projector 100 has the dual functions of wall projection and desktop projection, and the user can use the functions of wall projection and desktop projection simultaneously as required: specifically, when the driving device 50 controls the half mirror 42 to move to the first position, the wall surface projection effect can be achieved; when the driving device 50 controls the half mirror 42 to move to the second position, the wall projection and the desktop projection can be simultaneously performed. Of course, in order to ensure the transmission effect of the half mirror 42, the supporting plate 54 should be made of a transparent material, or the supporting plate 54 is set to have a hollow structure corresponding to the half mirror 42.

Further, referring to fig. 1 to 4, the driving device 50 further includes: a first sensed member 561, a second sensed member 562, a first sensor 571 and a second sensor 572, wherein the first sensed member 561 is fixed on the reflector 40; the second sensed part 562 is fixedly arranged on the reflector 40; the first sensor 571 is disposed on one side of the reflector 40, and when the reflector 40 is at the first position, the first sensed member 561 is located within the sensing range of the first sensor 571; the second inductor 572 and the first inductor 571 are arranged side by side along a direction perpendicular to the extending direction of the screw 52, and when the mirror 40 is at the second position, the second sensed member 562 is located within the sensing range of the second inductor 572.

In this embodiment, the position of the reflector 40 can be identified through the cooperation of the first sensed member 561, the second sensed member 562, the first sensor 571, and the second sensor 572, so as to determine what function mode the projector 100 is in. Specifically, the first sensor 571 and the second sensor 572 are fixed in the housing of the projector 100 in a mutually attached manner, the first sensed part 561 and the second sensed part 562 are staggered and arranged at intervals along the extending direction parallel to the screw 52, the first sensed part 561 and the second sensed part 562 are both fixedly connected with the supporting plate 54, the first sensed part 561 corresponds to the first sensor 571, and the second sensed part 562 corresponds to the second sensor 572: when the driving device 50 controls the reflector 40 to move to the first position, the first sensed member 561 enters the sensing range of the first sensor 571, and at this time, the first sensor 571 outputs a corresponding first sensing signal to the controller of the optical projection engine 100, and the controller recognizes that the reflector 40 is at the first position accordingly; similarly, when the driving device 50 controls the mirror 40 to move to the second position, the second sensed part 562 enters the sensing range of the second sensor 572, and at this time, the second sensor 572 outputs a corresponding second sensing signal to the controller of the light projector 100, and the controller recognizes that the mirror 40 is at the second position accordingly. When the functional mode needs to be switched, the controller can determine to control which direction the mirror 40 moves and the distance of the movement according to the identified current position of the mirror 40, thereby completing the switching of the functional mode of the optical projection engine 100. The first sensor 571 and the second sensor 572 can be arranged together by the first sensed part 561 and the second sensed part 562 being respectively matched with the first sensor 571 and the second sensor 572 for detection, so that the optical projection device is applicable to the case of limited space of the housing of the optical projection machine and avoids shielding the projection beam.

It is easily understood that as a variation of the above, only one sensed member may be provided on the reflecting mirror 40, and the first sensor 571 and the second sensor 572 may be provided at intervals in parallel with the extending direction of the screw 52. Thus, when the reflector 40 is at the first position, the sensed object is located within the sensing range of the first sensor 571; when the reflector 40 is at the second position, the sensed object is located within the sensing range of the second sensor 572.

Further, referring to fig. 1 to 4, the first sensor 571 includes a first transmitting end 5711 and a first receiving end 5712 which are oppositely disposed, and a first sensing slot is formed between the first transmitting end 5711 and the first receiving end 5712; when the reflector 40 is at the first position, the first sensed member 561 is located in the first sensing slot; the second inductor 572 comprises a second transmitting end and a second receiving end which are arranged oppositely, and a second induction groove is formed between the second transmitting end and the second receiving end; when the reflector 40 is at the second position, the second sensed member 562 is located in the second sensing groove.

In this embodiment, the first sensor 571 and the second sensor 572 may be photo sensors. Taking the first sensor 571 as an example, the first emitting end 5711 emits a detection light beam toward the first receiving end 5712, and when the first sensed element 561 is not placed in the first sensing groove formed by the first emitting end 5711 and the first receiving end 5712, the first receiving end 5712 can completely receive the detection light beam; when the first sensed member 561 enters the first sensing slot, the detection light beam emitted from the first emitting end 5711 is blocked by the first sensed member 561, and the first receiving end 5712 cannot receive the detection light beam, so as to generate a corresponding first sensing signal, and output the first sensing signal to the controller of the projection optical device 100. The structure and principle of the second sensor 572 are the same, and are not described in detail.

In an embodiment of the present invention, referring to fig. 5 to 7, the number of the reflectors 40 is two, one of the reflectors 40 is a total reflection reflector 41, the other reflector 40 is a half reflection reflector 42, and the total reflection reflector 41 and the half reflection reflector 42 are arranged in parallel along the extending direction of the screw 52; wherein, when the total reflection mirror 41 is at the second position, the half reflection mirror 42 is at the first position; when the half mirror 42 is in the second position, the full mirror 41 is in the first position; alternatively, the total reflection mirror 41 and the half reflection mirror 42 are both in the first position.

In this embodiment, the total reflection mirror 41 and the half reflection mirror 42 are disposed and attached on the same supporting plate 54, the supporting plate 54 is connected to the screw 52 through the nut 53, for the convenience of moving, the extending direction of the screw 52 is perpendicular to the plane where the optical axis of the first lens group 20 and the optical axis of the second lens group 30 are located, and the plane where the supporting plate 54 is located is perpendicular to the symmetrical center line of the optical axis of the first lens group 20 and the optical axis of the second lens group 30. When the functional mode is switched, the driving device 50 controls the half mirror 42 and the half mirror 41 to move synchronously in the extending direction of the screw 52. Thus, the optical projector 100 has dual functions of wall projection and desktop projection, and has three functional modes, and a user can select the wall projection function and the desktop projection function or simultaneously use the dual functions of wall projection and desktop projection according to needs. Specifically, when the driving device 50 controls the total reflection mirror 41 and the half reflection mirror 42 to move to the first position (at this time, the specific first positions of the total reflection mirror 41 and the half reflection mirror 42 are different), the wall surface projection function can be realized; when the driving device 50 controls the total reflection mirror 41 to move to the second position and the semi-transmission and semi-reflection mirror 42 to move to the first position, the desktop projection function can be realized; when the driving device 50 controls the half mirror 42 to move to the second position and the full mirror 41 to move to the first position, the effect of wall projection and desktop projection can be achieved.

Further, the driving device 50 further includes: referring to fig. 5 to 7, a third sensed member 581, a fourth sensed member 582, a third sensor 591 and a fourth sensor 592, wherein the third sensed member 581 is fixed on the total reflection mirror 41; the fourth sensed part 582 is fixedly arranged on the half-reflecting and half-transmitting mirror; the third sensor 591 is disposed at one side of the total reflection mirror 41, and when the total reflection mirror 41 is at the second position, the third sensed member 581 is located within the sensing range of the third sensor 591; the fourth inductor 592 and the third inductor 591 are arranged side by side along a direction perpendicular to the extending direction of the screw 52, and when the half mirror 42 is in the second position, the fourth sensed member 582 is located within the sensing range of the fourth inductor 592.

In this embodiment, the positions of the transflective mirror 41 and the transflective mirror 42 can be identified through the cooperation of the third sensed member 581, the fourth sensed member 582, the third sensor 591 and the fourth sensor 592, so as to determine what function mode the projector 100 is in. Taking the example that one empty position 43 is preset between the total reflection mirror 41 and the semi-transparent reflection mirror 42 (in other embodiments, the position sequence of the total reflection mirror 41, the semi-transparent reflection mirror 42 and the empty position 43 can be arbitrarily adjusted), specifically, the third sensor 591 and the fourth sensor 592 are mutually attached and fixed in the housing of the projection optical engine 100, the third sensed member 581 and the fourth sensed member 582 are dislocated and spaced along the extending direction parallel to the screw 52, the third sensed member 581 and the fourth sensed member 582 are both fixedly connected with the supporting plate 54, the third sensed member 581 corresponds to the third sensor 591, and the fourth sensed member 582 corresponds to the fourth sensor 592: when the driving device 50 controls the total reflection mirror 41 to move to the second position, the third sensed member 581 enters the sensing range of the third sensor 591, and at this time, the third sensor 591 outputs a corresponding third sensing signal to the controller of the optical projection engine 100, and the controller recognizes that the total reflection mirror 41 is at the second position accordingly; when the driving device 50 controls the half mirror 42 to move to the second position, the fourth sensed member 582 enters the sensing range of the fourth sensor 592, at this time, the fourth sensor 592 outputs a corresponding fourth sensing signal to the controller of the light projector 100, and the controller recognizes that the half mirror 42 is in the second position accordingly; when the driving device 50 controls the idle position 43 on the supporting plate 54 to move to the second position, the third sensed member 581 does not enter the sensing range of the third sensor 591, and the fourth sensed member 582 does not enter the sensing range of the fourth sensor 592, at this time, neither the third sensor 591 nor the fourth sensor 592 generates a varying sensing signal, and the controller recognizes that neither the all-anti-mirror 41 nor the half-anti-mirror 42 is in the second position accordingly. When the functional mode needs to be switched, the controller can determine which direction the supporting plate 54 is controlled to move and the moving distance according to the identified current positions of the total reflection mirror 41, the semi-transmission and semi-reflection mirror 42 and the idle position 43, thereby completing the switching of the functional mode of the optical projector 100.

In an embodiment of the present invention, referring to fig. 8, the optical axis of the first lens group 20, the optical axis of the second lens group 30 and the optical axis of the projection beam intersect at the same point; the number of the reflecting mirrors 40 is two, and the reflecting mirrors are respectively a first reflecting mirror 44 and a second reflecting mirror 45, and the first reflecting mirror 44 and the second reflecting mirror 45 are arranged along the extending direction of the screw rod 52; when the first reflector 44 is at the third position, the projection light beam is reflected by the first reflector 44 and then exits through the first lens group 20; when the second reflector 45 is at the fourth position, the projection beam mirror is reflected by the second reflector 45 and then exits through the second lens group 30.

In this embodiment, for convenient movement, the extending direction of the screw 52 is perpendicular to the plane where the optical axis of the first lens group 20 and the optical axis of the second lens group 30 are located, and the plane where the first reflector 44 is located and the plane where the second reflector 45 is located are arranged in a crossed manner (the plane where the first reflector 44 is located is perpendicular to the optical axis of the projection beam and the symmetric center line of the optical axis of the first lens group 20, and the plane where the second reflector 45 is located is perpendicular to the optical axis of the projection beam and the symmetric center line of the optical axis of the second lens group 30), the first reflector 44 and the second reflector 45 can be respectively and correspondingly provided with a support plate 54, and each support plate 54 is respectively connected with the screw 52 through a nut 53.

In this embodiment, the third position of the first reflector 44 should be that the first reflector 44 is located at the intersection of the optical axis of the first lens group 20 and the optical axis of the second lens group 30, and the plane of the first reflector 44 is perpendicular to the symmetric center line of the optical axis of the projection beam and the optical axis of the first lens group 20; when the first mirror 44 is at the third position, the projection beam irradiates the mirror 40, and the path of the projection beam is deflected by the reflection of the first mirror 44, and is emitted through the first lens group 20. The fourth position of the second reflector 45 should be that the second reflector 45 is located at the intersection of the optical axis of the first lens group 20 and the optical axis of the second lens group 30, and the plane of the second reflector 45 is perpendicular to the symmetrical center line of the optical axis of the projection beam and the optical axis of the second lens group 30; when the second reflector 45 is at the fourth position, the projection beam irradiates the second reflector 45, and the propagation path of the projection beam is deflected by the reflection of the second reflector 45, so as to be emitted through the second lens group 30. In this embodiment, the first mirror 44 and the second mirror 45 are preferably the total reflection mirror 41. In addition, a sensed member and a sensor for detecting the positions of the first reflecting mirror 44 and the second reflecting mirror 45 may be further provided, and specific configuration thereof may refer to the above embodiments, and will not be described herein again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.