阅读说明：本技术 一种防相机频闪装置 (Device for preventing camera from stroboscopic ) 是由 肖兵 黄昌松 于 2021-08-05 设计创作，主要内容包括：本发明属于防相机频闪技术领域,公开了一种防相机频闪装置,设于相机模组的镜头前方,所述防相机频闪装置包括减光片模块,减光片模块上连接有运动机构,所述减光片模块内滑动设有多组减光片组件,所述减光片模块上和运动机构上设有同轴的透光孔,所述减光片模块包括导轨板和减光片组件,导轨板上设有导向槽,减光片组件设于导向槽内,运动机构驱动减光片组件在导向槽内滑动。本申请提供的装置可以避免产生相机频闪,且画面亮度比较自然,既能避免相机频闪又能在不同场景兼顾画面效果,不会产生过曝。同时,该装置结构紧凑,尺寸小,结构简单,适合在手机、电脑、智能电视设备、数字会议设备等领域的相机模块中广泛应用。(The invention belongs to the technical field of camera stroboscopic prevention, and discloses a camera stroboscopic prevention device which is arranged in front of a lens of a camera module and comprises a dimmer module, wherein a movement mechanism is connected onto the dimmer module, a plurality of groups of dimmer assemblies are arranged in the dimmer module in a sliding manner, coaxial light transmitting holes are formed in the dimmer module and the movement mechanism, the dimmer module comprises a guide rail plate and the dimmer assemblies, a guide groove is formed in the guide rail plate, the dimmer assemblies are arranged in the guide groove, and the movement mechanism drives the dimmer assemblies to slide in the guide groove. The device that this application provided can avoid producing the camera stroboflash, and picture luminance is more natural, can avoid the camera stroboflash and can compromise the picture effect in different scenes again, can not produce overexposure. Meanwhile, the device has compact structure, small size and simple structure, and is suitable for being widely applied to camera modules in the fields of mobile phones, computers, intelligent television equipment, digital conference equipment and the like.)

1. The utility model provides a prevent camera stroboscopic device, its characterized in that includes the dimmer module, is connected with the motion on the dimmer module, it is equipped with multiunit dimmer piece subassembly to slide in the dimmer module, be equipped with coaxial light trap on the dimmer module and the motion, the dimmer module includes guide rail plate and dimmer piece subassembly, is equipped with the guide way on the guide rail plate, and the dimmer piece subassembly is located the guide way, and the motion drive dimmer piece subassembly slides in the guide way.

2. The device of claim 1, wherein the motion mechanism comprises a wheel, a driving slot is disposed below the wheel, a position-limiting element is disposed on the dimmer pack, and the position-limiting element and the driving slot form a cam mechanism.

3. The device of claim 2, wherein the wheel disc is a gear disc, and the driving groove is composed of a circular groove exceeding 3/4 and a free curve groove concave to the center of the wheel disc.

4. The device of claim 3, wherein the guiding groove has 2i +1 stations, and the dimmer module has at most 2i groups of dimmer components with different transmittances, i being a natural number.

5. The device of claim 4, wherein the guide slot is cross-shaped or in-line; when the guide groove is in a cross shape, 5 stations are formed in the guide groove, the number of the light reduction sheet assemblies is at most 4, and the light reduction sheet assemblies are arranged in the stations of the guide groove;

when the guide way is the straight line, form 3 stations in the guide way, the dimmer subassembly mostly 2 groups, the dimmer subassembly is located in the corresponding station of guide way.

6. The device of claim 4, wherein the cross-shaped guide slot has a transverse axis and a longitudinal axis that are equal in length, and the transverse axis and the longitudinal axis are 3 times the length of the light reduction sheet assembly.

7. The device of any one of claims 2-6, wherein the light reduction sheet assembly comprises a light reduction sheet support frame, the light reduction sheet support frame having a light reduction sheet embedded therein, and a position limiting member disposed on an upper surface of the light reduction sheet support frame.

8. The device of claim 7, wherein the position-limiting member is an upward cylindrical protrusion, and the cylindrical protrusion is disposed above an end of the dimmer support frame away from the dimmer.

9. The device of claim 8, wherein a wheel cover is disposed above the wheel, the wheel cover rotatably engaging the wheel; the edge of the wheel disc cover plate is fixedly connected with the guide rail plate.

10. The device of claim 9, wherein the diameter of the wheel disc is larger than the length of the side of the wheel disc cover plate and the rail plate, and the diameter of the wheel disc is smaller than the length of the diagonal of the wheel disc cover plate and the rail plate.

Technical Field

The invention relates to the technical field of camera stroboflash prevention, in particular to a camera stroboflash prevention device.

Background

The camera strobes, also called Power-frequency flicker, Power line flicker, and English Power-line flicker. The stroboscopic effect of the camera is a common physical phenomenon when the camera shoots and records under the environment of an electric power light source.

Because the alternating current frequency in China is 50Hz, the alternating current frequency in countries such as English, American and the like is 60Hz, and the corresponding energy change frequencies are 100Hz and 120Hz respectively. Incandescent lamps and some fluorescent lamps flicker in bright and dark at the corresponding alternating current energy change frequency during operation, but because the flicker frequency exceeds the human eye perception range, the flicker cannot be directly perceived by human beings. In such a scene, when camera shooting or video recording is performed using a device such as a mobile phone or a notebook computer, the flicker may be seen. The reason for this strobe can be seen by the camera: the camera sensor (sensor) used in mobile phones and notebook computers is usually a CMOS image sensor, which is actually exposed line by line (rolling shutter), and although the exposure time is the same between different lines, the starting point of exposure is different, so that the energy received by different lines is not necessarily the same. When the frequency is larger than the flicker frequency of the light and is not integral multiple of the light and the high-speed camera, different rows of the sensors can acquire images of different moments of the light and the shade of the environment at different times, and then the light and the shade of the environment can be seen in the images of the cameras, namely the stroboflash of the cameras.

The CMOS image sensor is widely used in mobile phones, computers, smart televisions, digital conference equipment, security equipment, vehicle-mounted equipment, medical equipment, military equipment and aviation equipment, and most of the CMOS image sensors adopt a rolling line-by-line exposure mode; in most use environments, lighting lamps powered by alternating current are often adopted, such as incandescent lamps and partial fluorescent lamps, and when a camera shoots and records in the light source environment, the camera is easy to flash, the imaging quality is seriously affected, and very poor user experience is achieved.

The prior art generally adopts the following strategy to solve the problem of camera stroboscopic: the first solution is to change the light source environment: for example, the curtain is pulled up to enable the camera to measure light in a dark place, and a light source causing stroboflash is closed or light equipment causing stroboflash is replaced; however, this method requires user intervention, and the experience is not good, even the user may not accept the method. The second solution is to change the model of the camera module: the sensor parameters of the camera modules of different models have certain difference, so that the stroboscopic probability is different under certain scenes, and the module with lower stroboscopic probability can be selected to replace theoretically; however, replacing the sensor model means that the manufacturer needs to change the design scheme and the cost plan, and even sacrifice the excellent characteristics of the original sensor; and the scenes with stroboflash are relatively few after replacement, but stroboflash cannot be avoided fundamentally. The third solution is to adjust the camera sensor exposure parameters from the software side: such as setting the exposure time to an integer multiple of 1/100s (50 Hz for ac power) or increasing the EV until the strobe disappears; this method can eliminate stroboflash but can cause overexposure of the picture. Although the three schemes can solve the existing stroboscopic problem, the three schemes have great defects. Therefore, the prevention of camera stroboflash by reducing the light-entering amount of the camera module is gradually developed. However, people generally adopt 1 electronic dimming mirror (electronic ND mirror) or variable aperture lens arranged at the front end of the camera lens to reduce the light input quantity, but the electronic dimming mirror is generally applied to high-end professional camera equipment, has extremely high cost and is not easy to popularize; the camera modules of mobile phones, computers and other devices are difficult to add variable apertures due to limitations on cost and size, and are not common (for example, a three-star Galaxy S9/S9 Plus two-gear aperture is actually equivalent to one more large aperture for improving the image quality of dark light, and a small aperture is a common aperture and cannot avoid stroboflash). Therefore, the camera stroboscopic prevention device which is simple in structure, small in size, convenient to operate and low in cost is developed, and has a wide market prospect.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the camera stroboscopic prevention device which is simple in structure and convenient to control.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a prevent camera stroboscopic device, includes the dimmer module, is connected with the motion on the dimmer module, it is equipped with multiunit dimmer piece subassembly to slide in the dimmer module, be equipped with coaxial light trap on the dimmer module and on the motion, the dimmer module includes guide rail plate and dimmer piece subassembly, is equipped with the guide way on the guide rail plate, and the dimmer piece subassembly is located the guide way, and the motion drives the dimmer piece subassembly and slides in the guide way.

Furthermore, the motion mechanism comprises a wheel disc, a driving groove is formed below the wheel disc, a limiting part is arranged on the light reduction piece assembly, and the limiting part and the driving groove form a cam mechanism.

Furthermore, the wheel disc is a gear disc, and the driving groove consists of an arc groove exceeding 3/4 and a section of free curve groove concave to the center of the wheel disc.

Furthermore, 2i +1 stations are arranged in the guide groove and comprise a central station and 2i fixed stations, 2i groups of light-reducing sheet assemblies with different transmittances are arranged on the light-reducing sheet module at most, i is a natural number, the light-reducing sheet assemblies are located on the fixed stations when light reduction is not needed, and when light reduction is needed, the corresponding light-reducing sheet assemblies slide to the light holes under the action of the movement mechanism to perform light reduction.

Furthermore, the guide groove is in a cross shape or a straight shape; when the guide groove is in a cross shape, 5 stations are formed in the guide groove, the number of the light reduction sheet assemblies is at most 4, and the light reduction sheet assemblies are arranged in the stations of the guide groove;

when the guide way is the straight line, form 3 stations in the guide way, the dimmer subassembly mostly 2 groups, the dimmer subassembly is located in the corresponding station of guide way.

Further, the length of the transverse axis and the longitudinal axis of the cross-shaped guide groove are equal, and the length of the transverse axis and the length of the longitudinal axis are 3 times of the length of the light reduction plate assembly.

Alternatively, the length of the transverse axis of the linear guide groove is 3 times the length of the light reduction sheet assembly.

Furthermore, the dimmer component comprises a dimmer supporting frame, a dimmer is embedded in the dimmer supporting frame, the limiting part is arranged on the upper surface of the dimmer supporting frame, the dimmer component is in sliding fit with the guide groove, and the dimmer component slides back and forth along the guide groove under the action of the cam mechanism.

Furthermore, the limiting part is an upward cylindrical boss, and the cylindrical boss is arranged above one end, far away from the dimmer, of the dimmer supporting frame. The cylindrical boss and the light reduction sheet supporting frame are of an integrated structure, so that the strength of the light reduction sheet assembly is increased, and the processing and the manufacturing are facilitated.

Furthermore, a wheel disc cover plate is arranged above the wheel disc, and the wheel disc cover plate is in rotating fit with the wheel disc; the edge of the wheel disc cover plate is fixedly connected with the guide rail plate, and a gap is reserved in the middle of the wheel disc cover plate and used as a rotating space of the wheel disc.

Furthermore, the diameter of the wheel disc is larger than the side length of the wheel disc cover plate and the guide rail plate, the diameter of the wheel disc is smaller than the length of the diagonal line of the wheel disc cover plate and the guide rail plate, part of wheel teeth of the wheel disc extend out of the wheel disc cover plate and then are meshed with a transmission part of a motor, and the motor drives the wheel disc to rotate.

Furthermore, the centers of the guide rail plate, the wheel disc and the wheel disc cover plate are provided with through holes with the same diameter and the same axis, all the through holes form light holes, and the diameter and the aperture of each light hole are not smaller than the visual diameter of the camera module lens.

Furthermore, a countersunk hole or a circular boss is arranged at the center of one side of the wheel disc, which is not provided with the driving groove, and the wheel disc is supported and is convenient to rotate around the central axis; and one surface of the wheel disc cover plate is provided with a circular boss or a countersunk head around the outer edge of the through hole, and the circular boss or the countersunk head is matched with the corresponding countersunk hole or the circular boss of the wheel disc.

Compared with the prior art, the invention has the beneficial effects that:

(1) the device is arranged in front of the camera module, and the dimmer module is replaced in a mechanical mode for different brightness environments, so that the light inlet quantity of the camera module is controlled. For a high-brightness scene, the light-reducing sheet with lower light transmittance is applied to reduce the light inlet amount (at the moment, the exposure time of the camera sensor can be correspondingly and automatically increased), so that the camera stroboflash is avoided, the brightness of the picture is natural, the camera stroboflash can be avoided, the picture effect can be considered in different scenes, and the overexposure cannot be generated.

(2) The light hole is coaxial with camera module sensor optical axis, but the relative position of dimmer center and optical axis changes along with the carousel rotates to realize different light incident volumes, so that be applicable to different environment.

(3) When the guide groove is in a cross shape, 5 stations are formed, and 5 light transmission states, namely a full light transmission state and 4 light reduction states, are realized; when the guide way is the straight line, formed 3 stations, realized 3 kinds of printing opacity states namely a full light-transmitting state and 2 dim light states.

(4) The length and/or the width of the guide groove are/is integral multiples of the light reduction sheet assembly, especially when the guide groove is in a cross shape, the length of a longitudinal shaft and the length of a transverse shaft of the guide groove are 3 times of that of the light reduction sheet assembly and are averagely divided into 3 stations, the cross position of the guide groove forms a central station, the volume of each station is equal to that of the light reduction sheet assembly, the stations are compact, and the size of the whole equipment is reduced.

Simultaneously, this application forms the cam structure through the locating part cooperation of drive groove with the dimmer plate subassembly, drive the dimmer plate subassembly and smooth the slip in the guide way, do reciprocal translation slip in the guide way in proper order by the rotary motion drive different dimmer plate subassemblies of rim plate, the dimmer plate subassembly only need realize with the sliding fit of guide way can, mechanical rotation through the control rim plate drives the dimmer plate subassembly and removes in the slide way, need not to set up other control structure or drive structure on the dimmer plate, moreover, the steam generator is simple in structure, convenient control, the reliability is high, easily realize and use, this application can satisfy the requirement of small size, and is with low costs, and is suitable for the cell-phone, a computer, intelligent television equipment, the wide application in the camera module in fields such as digital conference equipment.

Drawings

Fig. 1 is an exploded view of a camera strobe prevention device;

FIG. 2 is a schematic three-dimensional structure of a camera strobe prevention device;

FIG. 3 is a front view of the device for preventing camera stroboscopic;

FIG. 4 is a top view of the camera strobe prevention device;

FIG. 5 is a schematic three-dimensional structure of a rail plate;

FIG. 6 is a schematic three-dimensional structure of a light-reducing sheet support frame;

FIG. 7 is a top view of the wheel disc;

figure 8 is a wheel orientation and station profile.

In the figure: the device comprises a guide rail plate 1, a dimmer component 2, a dimmer 21, a dimmer supporting frame 22 and a limiting piece 23; the wheel disc 3, the wheel disc cover plate 4, the screw 5, the camera module 6, the driving groove 7 and the guide groove 8.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention is further explained below with reference to the accompanying drawings.

Example 1

An apparatus for preventing camera stroboscopic is shown in fig. 1-7, and comprises a dimmer module and a moving mechanism. The device for preventing the camera stroboflash is fixed in front of or right above a lens of the camera module 6, the camera module 6 and the dimmer module are both connected with the MCU, and the movement mechanism is controlled by the MCU and can push the dimmer component 2 to slide. The dimmer module comprises a guide rail plate 1 and a dimmer component 2, and the dimmer component 2 is in sliding fit with the guide rail plate. The dimmer module is arranged below the moving mechanism and close to the camera module 6, and the bottom of the dimmer module (namely the bottom of the guide rail plate) has a certain gap with the lens of the camera module 6, and the gap is required to ensure that the outer edge of the lens is not contacted with the dimmer 21 module when the lens is pushed to the farthest point when the camera module 6 is focused.

The motion mechanism comprises a micro drive motor, a gear-shaped wheel disc 3 (driven by the micro step motor) and a wheel disc cover plate 4 above the wheel disc 3, and the wheel disc cover plate 4 is in rotary fit with the wheel disc 3. The wheel disc 3 is arranged above the dimming sheet module, the structure of the wheel disc is shown in fig. 7, a driving groove 7 is arranged below the wheel disc 3, a limiting part 23 is arranged on the dimming sheet module, the top end of the limiting part 23 extends into the driving groove 7, the driving groove 7 is composed of an arc groove exceeding 3/4 and a free curve groove with a section of concave towards the circle center of the wheel disc, the limiting part 23 is matched with the driving groove 7 below the wheel disc to form a cam mechanism, and the sliding track of the dimming sheet module 2 is limited through the driving groove 7.

The structure of the guide rail plate 1 is as shown in fig. 5, a cross-shaped guide groove 8 is arranged on one side of the guide rail plate 1, which is far away from the camera module 6, the length and the width of the guide groove 8 are equal to or slightly smaller than those of the guide rail plate (namely 4 ends are flush with the edge of the guide rail plate 1 or a partition is arranged between the guide groove 8 and the edge of the guide rail plate 1), and the light reduction sheet assembly 2 is slidably arranged in the guide groove 8, so that the light reduction sheet assembly can slide in the guide groove by applying smaller force. The longitudinal length and the transverse length of the cross-shaped guide groove 8 are 3 times of the length of the light reducing sheet assembly, the longitudinal length and the transverse length are crossed to form a left transverse position, a right transverse position, an upper longitudinal position and a lower longitudinal position which are 2 fixed stations, a moving station located in the center (crossed position) is formed, 5 stations are formed in total, the five stations are connected, and the area of each station is equal to the area of the light reducing sheet assembly 2. At most four groups of the dimmer packs 2 with different transmittances and the same size are arranged in the guide groove 8, and four groups, three groups and two groups can be used. In this embodiment, taking four sets of the dimmer assemblies 2 as an example, but not limited to four sets of the dimmer assemblies 2, initially, the four sets of the dimmer assemblies 2 are respectively disposed in 4 fixed stations in the guide slot 8, and the moving mechanism drives the dimmer assemblies 2 to slide to a moving station at the center (i.e., move to the front of the lens) or a moving station away from the center (reset). During operation, at least 0 and at most 1 dimmer sheet 21 is applied to control the camera light input: for a high-brightness environment in which stroboflash easily occurs, 1 light reduction sheet 21 is applied to reduce the light entering amount, and the light reduction sheet 21 with lower light transmittance is applied when the environment is brighter; whereas for non-said high brightness environments no dimmer 21 is applied.

The dimmer plate assembly 2 includes a dimmer plate support frame 22 and a dimmer plate 21. The structure of the dimmer supporting frame 22 is shown in fig. 6, a groove is arranged on the upper side surface of the dimmer supporting frame 22, an opening is arranged at one end of the groove or the groove is not arranged, and the dimmer 21 is embedded in the groove. When one end of the groove is opened, an external acting force is applied along the opening direction, so that the light-reducing sheet 21 can be pushed out from the groove, and the light-reducing sheet 21 is convenient to replace. The dimmer supporting frame 22 may not be provided with a groove, and the dimmer 21 is directly fixed on the dimmer supporting frame 22 by means of glue or the like.

The limiting member 23 is disposed above an end of the dimmer supporting frame 22 away from the dimmer 21, and the limiting member 23 and the dimmer supporting frame 22 are integrated. The limiting part 23 is matched with the driving groove 7 of the motion mechanism to form a cam mechanism and apply driving force to the dimmer component 2 to drive the dimmer component 2 to slide along the guide groove, the limiting part 23 can be a straight cylindrical boss or a stepped cylindrical boss with a large top and a small bottom, and the limiting part 23 can not only drive the dimmer component 2 to move, but also prevent the dimmer component 2 from sliding down from the guide groove. The transmittance combinations of the four groups of light reduction sheets 21 may be 50%, 25%, 12.5%, 6.25% (corresponding to ND2, ND4, ND8, ND 16), or other combinations, for example, 80%, 60%, 40%, 20%, or other values, for example, 85%, 65%, 45%, 25%, and the light reduction sheets may or may not decrease proportionally.

The center of the side of the wheel disc 3 not provided with the sliding groove 7 is provided with a countersunk hole (the aperture is larger than the through hole) or a round boss for supporting the wheel disc 3 and facilitating the rotation of the wheel disc 3 around the central axis. One side of the wheel disc cover plate 4 is provided with a round boss (or a countersunk hole) around the outer edge of the through round hole, and the round boss (or the countersunk hole) can be matched with the corresponding countersunk hole (or the round boss) of the wheel disc 3.

The edge of the wheel disc cover plate 4 is provided with a raised cylinder, a bolt hole is arranged in the cylinder, and a guide rail plate is provided with a bolt hole corresponding to the guide rail plate; or, the edge of the wheel disc cover plate 4 is provided with a bolt hole, the guide rail plate is provided with a convex cylinder matched with the guide rail plate, the bolt hole is arranged in the convex cylinder, and then the wheel disc cover plate 4 is fixed on the guide rail plate 1 through a screw 5 to reserve a corresponding space for installing the wheel disc.

The diameter of the wheel disc 3 is larger than the side length of the wheel disc cover plate 4 and the guide rail plate 1, the diameter of the wheel disc 3 is smaller than the diagonal length of the wheel disc cover plate 4 and the guide rail plate 1, and only part of wheel teeth of the wheel disc 3 need to be ensured to extend out of the wheel disc cover plate 4 to be meshed with the micro stepping motor.

The centers of the guide rail plate 1, the wheel disc 3 and the wheel disc cover plate 4 are all provided with through holes with the same diameter and the same shaft, the 3 through holes form light transmission holes penetrating through the whole camera stroboscopic prevention device, and the axis of each light transmission hole is superposed with the axis of a camera lens; the diameter and the aperture of the light hole are not less than the visual diameter of the lens of the camera module 6.

In addition, the camera stroboscopic prevention device provided by the embodiment can be embedded in a common base of a camera on corresponding equipment (such as a mobile phone, a computer and a business display device), a supporting seat can be additionally added, and the camera stroboscopic prevention device can be further fixed in a bayonet, a cover plate or an adhesive mode. The guide rail plate or the wheel disc cover plate in the dimmer module is used for supporting, and a clamping groove can be arranged at the bottom side of the guide rail plate and clamped on the lens of the camera module 6 to keep a certain gap.

The specific working process of the camera stroboscopic prevention device is as follows:

as shown in fig. 7, 5 tools are provided in the guide groove 8Bits are respectively denoted as P₀、P₁、P₂、P₃、P₄In which P is₀The number of the left, upper, right and lower 4 light reduction sheet assemblies 2 at the moving station in front of the lens is sequentially 2-I, 2-II, 2-III and 2-IV, the light transmittance is sequentially reduced, and the light transmittance of the four light reduction sheets 21 is sequentially 50%, 25%, 12.5% and 6.25%. Wherein P is₀Denotes no application of a light-reducing sheet, P₁、P₂、P₃、P₄Which in turn means that one of the 4 dimmer plates 21 is applied. Since the transmittance is equivalent to 100% when no dimmer 21 is applied, 5 adjustable shifts also correspond to 5 transmittances.

The micro driving motor drives the wheel disc 3 to rotate mechanically, then the driving groove 7 of the wheel disc 3 rotates along with the wheel disc 3, when the limiting part 23 of the light reduction sheet component with corresponding work is positioned in the large arc area of the driving groove 7, the limiting part does not move because the radius of the arc section is not changed, and the position of the light reduction sheet component 2 is not changed.

When the limiting piece 23 of a certain dimming sheet assembly 2 starts to enter a free curve groove, the distance between the free curve groove and the center of the wheel disc 3 is changed, the limiting piece is forced to move towards the center of the wheel disc 3, the guide groove 8 is linearly arranged, the dimming sheet assembly 2 is limited by the guide groove, when the wheel disc 3 rotates, the cam mechanism formed by the driving groove 7 and the limiting piece 23 drives the dimming sheet assembly 2 to do translational linear sliding in respective guide rails (or guide grooves), and when the dimming sheet assembly moves to the central station of the guide groove, the wheel disc stops rotating; after the dimming is finished, the limiting part 23 is far away from the circle center of the wheel disc 3 under the action of the free curve groove, and the dimming sheet assembly 2 slides to a fixed station along the guide groove 8 to realize resetting.

Specifically, as shown in fig. 7 and 8, the stroke ranges of the respective light reduction plate assemblies 2 are, in order: the light-reducing sheet component 2-I consists of P₁To P₀The light-reducing sheet component 2-II consists of P₂To P₀The light-reducing sheet assembly 2-III is composed of P₃To P₀The dimmer pack 2-IV is composed of P₄To P₀. When the dimmer pack 2 slides to P₀When in use, the corresponding dimmer 21 is just positioned at the center of the through hole of the dimmer module, namely, the shade is directly above the lens of the camera module 6; when the dimmer 21 slidesMove to get away from P₀When the station is in the reset state. The curve C of the driving groove is composed of a large arc exceeding 3/4 and a section of concave free curve, and the difference between the farthest distance and the nearest distance of the curve C from the central point is just equal to the travel range of each dimmer pack 2.

MCU constantly acquires environmental parameter (for example exposure time, EV etc.) from the camera module and judges the scene, then drives rim plate 3 rotation to the miniature stepper motor of different scene control, changes the dimmer state in the dimmer module, and then adjusts camera module sensor light inlet quantity. When the wheel disc 3 is facing (arrow direction in fig. 8) D₀、D₂、D₄Or D₆At this time, each of the light reduction sheet assemblies 2 is in a reset state, i.e., no light reduction sheet 21 covers the lens of the camera module 6, and the light transmittance is 100%. If dimming is required, the drive motor drives the wheel 3 to rotate when the wheel 3 is turned by D₀Go to D₁The cam mechanism formed by the driving groove and the limiting piece 23 drives the light reduction sheet component 2-I to move from P₁Slide along a straight line to P₀When the wheel 3 is driven by D₁Go to D₂The cam mechanism drives the light reduction sheet component 2-I by P₀Back to P along a straight line₀(ii) a The wheel disc 3 continues to rotate and can sequentially drive the dimmer component 2-II, 2-III and 2-IV to move to P₀Resetting until the dimmer component 2 meeting the requirement rotates to the central station P₀When the position is reached, the wheel disc 3 stops rotating, the shooting is finished, and the wheel disc 3 controls the light reduction sheet assembly 2 to reset. In the motion process of the wheel disc 3, at most 1 dimmer 21 covers the lens of the camera module 6, so that the stroboscopic effect of the camera is prevented.

Example 2

A camera flash prevention device, which is different from embodiment 1 in that: the guide groove is in a straight shape and is provided with 3 moving stations, including 2 fixed stations and a central station which are positioned at two ends; two groups of the light-reducing sheet assemblies 2 are arranged in the guide groove, and the length of the guide groove is 3 times of that of the light-reducing sheet assemblies; the curve C of the driving groove 7 of the wheel disc 3 is composed of a large arc exceeding 3/4 and a section of concave free curve, and the difference between the farthest distance and the nearest distance of the curve C from the central point is just equal to the stroke range of each dimmer pack 2. The remaining components are the same as in example 1.