A light transmission plate for a small camera recognition device

Abstract

The application discloses a light-transmitting plate for a small camera recognition device, a shell containing a handle and a transverse cavity, and the device is provided with a laser emitter, a 50% transparency refractor (provided with a polarizing film on the top) and a camera module below the transverse cavity. The light-transmitting plate is fixed at the joint of the handle and the transverse cavity, is a core stray light suppression component of an imaging light path, adopts high-transmittance optical resin or glass, and is not provided with a multi-layer anti-reflection coating on the front and back surfaces. A light-transmitting hole on the light-transmitting plate is determined through multiple rounds of optimization tests, is offset to the laser side along the central axis of the transverse cavity and relative to the geometric center, is coaxial with the refractor and the camera optical axis in orthographic projection, the hole wall is polished and is provided with a round corner, and the plate edge is provided with a buckle type structure to realize gapless fixation. The light-transmitting plate can block stray light to prevent false images, cooperates with the polarizing film to improve picture purity, can reduce ghosting and improve the transmittance contrast, is suitable for miniaturized design and meets the low-intensity light collection requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical light transmission and stray light suppression, and in particular to a light transmission plate for a small camera recognition device. BACKGROUND

[0002] In the field of small camera recognition devices, products with a pistol-shaped shell are often used in close-range target precision recognition scenarios due to their portability and handheld operation advantages, and to improve imaging accuracy, such devices often introduce cat-eye effect, that is, a laser is emitted by a laser emitter, the laser is reflected by the target surface, then returns along the original light path and is guided to the camera module through a 50% transparent refractor, relying on this effect to achieve efficient capture and imaging of the target, adapting to the structural characteristics of the pistol-shaped shell "handle holding - horizontal cavity light path integration".

[0003] However, such devices using cat-eye effect currently have key technical bottlenecks: due to the miniaturization of the shell, the internal light path space is compact, and the coaxial light path of laser emission-reflection-reception is extremely sensitive to stray light, and existing light transmission component design defects are significant: either the light transmission hole is not optimized and cannot accurately match the coaxial light path of the cat-eye effect, resulting in excessive effective laser loss or insufficient stray light suppression; or multiple layers of anti-reflection coating are used, which instead introduces additional stray light due to the reflection of environmental light by the coating layer; and the gap between the assembly of some light transmission components and the pistol-shaped shell handle-horizontal cavity interface further exacerbates the stray light problem, and the size is often not matched with the installation space, making it difficult to balance the stray light shielding and the miniaturization demand of the device. These problems directly restrict the imaging quality and environmental adaptability of cat-eye effect in small pistol-shaped shell camera recognition devices, and the bottleneck needs to be broken through by a targeted optimized light transmission component. SUMMARY

[0004] The purpose of the present application is to provide a light transmission plate for a small camera recognition device to solve the problems in the background art.

[0005] The present application is achieved by the following technical solutions:

[0006] A light transmission plate for a small camera recognition device, applied to a small camera recognition device with a pistol-shaped shell, the pistol-shaped shell includes a handle and a horizontal cavity, the device also has a laser emitter arranged in the horizontal cavity, a 50% transparent refractor for forming a coaxial light path, and a polarizing film above the refractor and a camera module below the refractor,

[0007] The light transmission plate is fixed at the junction of the handle and the horizontal cavity, and is a core stray light suppression component for the device imaging light path;

[0008] The light-transmitting plate is provided with a light-transmitting hole determined through multiple rounds of optimization tests, and the light-transmitting hole is a hole position on the light-transmitting plate with the optimal suppression effect on the reflection path of stray light.

[0009] The core role of the light-transmitting plate is to block stray light formed by reflection of ambient light through the front and back surfaces of the light-transmitting plate from entering an imaging light path, so as to avoid the stray light from forming a virtual image overlapping or separating from a main image on an image plane of the camera module.

[0010] The light-transmitting hole is offset to the laser emitter side relative to the geometric center of the light-transmitting plate, and is coaxially corresponding to the center of the orthographic projection of the 50% transparent refractor inside the device and the optical axis center of the camera module, thereby forming a through light path for laser emission-reflection reception, the light-transmitting hole includes a first right angle side, an oblique side, a second right angle side and an arc side connected in sequence, the extension lines at the connection positions of the first right angle side and the second right angle side and the oblique side are perpendicular, and the length of the first right angle side is greater than that of the second right angle side, the connection positions between the first right angle side, the oblique side, the second right angle side and the arc side are processed with continuous smooth fillets, and the edges of the light-transmitting hole are processed with continuous smooth fillets.

[0011] Further,

[0012] The light-transmitting plate is below the 50% transparent refractor inside the device and above the camera module, and is coaxially corresponding to the light paths of the laser emitter, the refractor and the camera module.

[0013] Further,

[0014] The light-transmitting hole corresponds to the position of the polarizing film inside the device, and the projection area of the polarizing film in the horizontal cavity completely covers the light-transmitting hole, so that the light passing through the light-transmitting hole enters the imaging light path after being filtered by the polarizing film.

[0015] Further,

[0016] The material of the light-transmitting plate is a high-transmittance optical material selected from optical resin or optical glass, and no multi-layer anti-reflection coating is arranged on the front and back surfaces of the light-transmitting plate.

[0017] Further,

[0018] The determination process of the light-transmitting hole through multiple rounds of optimization tests is as follows: the candidate hole positions with different positions, shapes and sizes on the light-transmitting plate are tested one by one, and the pictures collected by the camera module are compared in real time, and finally the optimal hole position is determined.

[0019] Further,

[0020] The structural design of the light-transmitting plate is adapted to the internal light path layout of the device, and the light-transmitting hole matches the light path for laser emission-reflection reception.

[0021] Further,

[0022] The edge of the light-transmitting plate is provided with a snap-fit fixing structure matched with the pistol-shaped shell, and the structure is tightly connected with the handle and the transverse cavity of the shell without assembly gap.

[0023] Further,

[0024] The hole wall of the light-transmitting hole is polished, which can further reduce the diffuse reflection of the hole wall to the laser, avoid the formation of secondary stray light by the reflection of the hole wall, and further optimize the imaging quality.

[0025] Further,

[0026] The hole wall of the light-transmitting hole is polished.

[0027] Further,

[0028] The planar size of the light-transmitting plate is matched with the mounting space at the junction of the handle and the transverse cavity of the pistol-shaped shell, the light-shielding area covers the area where the ambient light may be reflected into the imaging light path, and does not exceed the miniaturized design size of the device shell.

[0029] Further,

[0030] A small camera recognition device, characterized in that it comprises:

[0031] A pistol-shaped shell, the pistol-shaped shell comprising a handle and a transverse cavity;

[0032] A laser emitter, the laser emitter being arranged in the transverse cavity;

[0033] A 50% transparent refractive mirror, the refractive mirror being arranged in the transverse cavity for forming a coaxial light path of laser emission-reflection reception, and a polarizing film being arranged above the refractive mirror;

[0034] A camera module, the camera module being arranged below the refractive mirror and corresponding to the light path of the refractive mirror and the laser emitter;

[0035] The light transmission plate for the small camera recognition device is fixed at the junction of the handle and the transverse cavity, and is a core stray light suppression component of the device imaging light path; the light transmission hole on the light transmission plate is offset to the laser emitter side relative to the geometric center of the light transmission plate, and is coaxially corresponding to the center of the orthographic projection of the 50% transparent refractor and the optical axis center of the camera module, forming a through light path for laser emission-reflection reception, the light transmission hole includes a first right angle side, an oblique side, a second right angle side and an arc side connected in sequence, the extension lines at the connection positions of the first right angle side and the second right angle side and the oblique side are perpendicular, the length of the first right angle side is greater than that of the second right angle side, and the connection positions between the first right angle side, the oblique side, the second right angle side and the arc side and the edge of the light transmission hole wall are all processed by continuous smooth fillets; the edge of the light transmission plate is provided with a buckle type fixing structure matched with the pistol type shell, and the handle and the transverse cavity of the shell are tightly connected without assembly gap through the structure; the polarizing film completely covers the light transmission hole in the projection area of the transverse cavity.

[0036] The present application has the beneficial effects:

[0037] 1. The light transmission plate is a core stray light suppression component of the device imaging light path, which can accurately block the stray light formed by the reflection of ambient light on its front and back surfaces from entering the light path, thereby avoiding the formation of virtual images on the camera module image plane due to stray light overlapping or separating from the main image. In practical applications, this design can significantly reduce the ghost energy formed by stray light, while significantly improving the transparency and contrast of the camera captured image. It not only meets the clear imaging requirements in normal light environment, but also solves the problem of blurred image and lost details in low light environment, making the color, outline and texture of the object always clear and identifiable, and significantly expanding the application scenario range of the device.

[0038] 2. The light transmission hole is precisely designed to be located on the center axis of the light transmission plate along the extension direction of the transverse cavity and offset to the laser emitter side relative to the geometric center, and is strictly coaxially corresponding to the center of the orthographic projection of the 50% transparent refractor and the optical axis center of the camera module. This coaxial design can ensure that the complete light path of "laser emission - refractor reflection - light transmission hole - camera reception" is not offset, and effectively avoids the waste of effective laser energy caused by light path misalignment. Compared with the traditional light transmission plate geometric center hole design, this coaxial structure can control the effective laser loss at a very low level, laying a foundation for the stable reception of effective laser signals by the camera module, ensuring the imaging efficiency and image brightness, and avoiding the problem of dim imaging caused by insufficient laser energy.

[0039] 3. The light transmission hole is accurately corresponding to the position of the polarizing film in the device, and the polarizing film can completely cover the projection area of the transverse cavity, so that all the light passing through the light transmission hole must pass through the polarizing film before entering the imaging light path. The polarizing film can filter out the stray polarized light in the environment, and such stray polarized light is often one of the main reasons for the "haze" and "light spot" in the picture. Through the cooperative design, the "haze" in the picture can be effectively eliminated, and even in the low light environment with complex light, the picture collected by the camera can maintain high purity, the object edge has no blurred halo, and the details are more accurate, providing high-quality image basis for subsequent image recognition and feature extraction.

[0040] 4. The hole position of the light transmission hole is not randomly set, but is determined by the optimal scheme through shielding test of candidate hole positions with different positions, shapes and sizes on the light transmission plate, combined with the comparison results of real-time picture collected by the camera module. This process can accurately select the hole position that can "maximally reduce ghost effect and minimize effective laser loss", and completely solve the single defect of "paying more attention to ghost suppression and less attention to laser loss" or "paying more attention to laser utilization and less attention to stray light control" in traditional hole design. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of the position of the light transmission plate;

[0042] Figure 2 is a display diagram of the light transmission hole opening process on the light transmission plate;

[0043] Figure 3 is Figure 2 the effect schematic diagram of No. 1-6 hole in the middle;

[0044] Figure 4 is Figure 2 the effect schematic diagram of No. 7 hole in the middle. DETAILED DESCRIPTION

[0045] The application will be further described in detail below in combination with the embodiments and drawings, but the embodiments of the application are not limited thereto.

[0046] Embodiment, see Figures 1 to 4 :

[0047] A light transmission plate for a small camera recognition device is applied to a small camera recognition device with a pistol-shaped shell, the pistol-shaped shell includes a handle and a transverse cavity, the device also has a laser emitter arranged in the transverse cavity, a 50% transparent refracting mirror for forming a coaxial light path, and a polarizing film above the refracting mirror and a camera module below the refracting mirror,

[0048] The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is a core stray light suppression component of the device imaging light path;

[0049] The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is a core stray light suppression component of the device imaging light path;

[0050] The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is a core stray light suppression component of the device imaging light path;

[0051] The light-transmitting hole is offset to the laser emitter side relative to the geometric center of the light-transmitting plate, and is coaxially corresponding to the center of the orthographic projection of the 50% transparent refractor inside the device and the optical axis center of the camera module, forming a through light path for laser emission-reflection reception, the light-transmitting hole includes a first right angle side, an oblique side, a second right angle side and an arc side connected in sequence, the extension lines of the connection positions of the first right angle side and the second right angle side and the oblique side are perpendicular, and the length of the first right angle side is greater than that of the second right angle side, the connection positions between the first right angle side, the oblique side, the second right angle side and the arc side are treated with continuous smooth fillets, and the edges of the light-transmitting hole are treated with continuous smooth fillets.

[0052] Further,

[0053] The light-transmitting hole corresponds to the lower part of the 50% transparent refractor inside the device and the upper part of the camera module, and is coaxially corresponding to the refractor and the camera module.

[0054] The light-transmitting hole precisely corresponds to the position directly below the refractor and the position directly above the camera module, forming a coaxial light path with the laser emitter, the refractor and the camera module, and the core benefit is that it can ensure that the complete light path of "laser emission-refractor reflection-light-transmitting hole-camera reception" has no deviation, avoiding the effective laser energy loss caused by light path misalignment, laying a stable light path foundation for clear imaging; in the practical application of the small camera recognition device with a pistol-shaped shell, when the laser emitter emits laser, the laser is reflected by the 50% transparent refractor and can smoothly pass through the light-transmitting hole along the coaxial path, and is finally accurately received by the camera module, without laser waste caused by light path deviation, ensuring the basic imaging efficiency and eliminating the light path deviation problem in subsequent picture acquisition.

[0055] Further,

[0056] The light-transmitting hole corresponds to the position of the polarizing film inside the device, and the projection area of the polarizing film in the transverse cavity completely covers the light-transmitting hole, so that the light passing through the light-transmitting hole enters the imaging light path after being filtered by the polarizing film, further improving the purity of the picture.

[0057] The projection of the polarizing film in the transverse cavity completely covers the light transmission hole, so that the light passing through the light transmission hole must be filtered by the polarizing film before entering the imaging light path. The advantage is that the polarizing film can effectively filter out the stray polarized light (such as reflected polarized light in the environment) passing through the light transmission hole, further reducing the interference of non-effective light on imaging, significantly improving the purity of the picture, and avoiding the "haze" or "light spot" caused by stray polarized light. In a low-light environment (such as an indoor low-light scene), the design effect is particularly prominent. The stray polarized light in the environment is completely filtered by the polarizing film before reaching the light transmission hole, so that the object image captured by the camera module does not appear "hazy" haze, and the details such as the edges and textures of the object can be clearly presented, greatly improving the imaging quality in a low-light environment.

[0058] Further,

[0059] The material of the light transmission plate is a high-transmittance optical material selected from optical resin or optical glass, and the front and rear surfaces of the light transmission plate are not provided with a plurality of antireflection coating films.

[0060] The high-transmittance material can minimize the absorption loss of effective laser and reflected light, ensuring smooth passage of light. Without the plurality of antireflection coating films, additional stray light caused by reflected ambient light can be avoided, and the transmittance and stray light suppression can be balanced.

[0061] Further,

[0062] The multi-round optimization test determination process of the light transmission hole is as follows: by performing occlusion tests on candidate hole positions of different positions, shapes, and sizes on the light transmission plate one by one, and comparing the images captured by the camera module in real time, the hole position is finally determined among all the candidate hole positions, which can minimize the ghosting effect and minimize the effective laser loss.

[0063] In an embodiment, Figure 2 After continuous occlusion, the hole position with the best effect is obtained, which minimizes the "ghost" (virtual image) effect caused by stray light and minimizes the effective laser loss, avoiding performance defects caused by single parameter trial and error (such as reducing the hole size to pursue ghost suppression, resulting in excessive laser loss). During the test, the "light transmission plate geometric center circular hole" and the "hole offset to the laser side" were compared and tested. Although the former is simple to process, the camera image has obvious ghosting. The ghosting energy of the latter is lower than that of the former, and the effective laser loss is reduced. Finally, the offset hole position is determined as the optimal choice, which effectively solves the contradiction between ghosting and laser loss when applied to the device, Figure 2 The effects of holes 1 to 6 are shown in Figure 3 , Figure 2 The effect of hole 7 is shown in Figure 4 , Figure 4 and Figure 3In contrast, the apparent reflected red light is reduced and the ghosting is weakened, and Figure 4 the background in the image is more clear, and the position of the bright spot in the image can be determined.

[0064] The stray light suppression effect of the light transmission plate is specifically manifested as: the ghosting energy formed by the stray light is reduced, the transparency and contrast of the image collected by the camera module are improved, and the image collection demand in a low light environment is met.

[0065] In view of the core pain point that "stray light leads to ghosting and image blurring", the practicability of the light transmission plate is verified from the effect level, and the application scenarios of the device are expanded, so that the device can not only work under normal light, but also stably collect clear images in a low light environment, and the environmental adaptability is improved; in the outdoor environment in the evening, the device without the light transmission plate collects images with obvious ghosting, and after the light transmission plate is installed, the ghosting energy is reduced, the transparency of the image is significantly improved, the color and contour details of the object can be clearly collected, and the recognition and imaging demand in a low light scene is completely met.

[0066] Further,

[0067] The edge of the light transmission plate is provided with a snap type fixing structure matched with the hand gun type shell, which is tightly connected with the handle and the transverse cavity of the shell without assembly gap, so that additional stray light is avoided due to the gap, and the stray light suppression effect of the light transmission plate is stable and reliable.

[0068] The light transmission plate is tightly connected with the handle and the transverse cavity without assembly gap, which can prevent "gap light leakage", avoid the environmental light from entering the imaging light path through the assembly gap to introduce additional stray light, ensure that the position of the light transmission plate is not deviated, the stray light suppression effect is not attenuated in long-term use, and the reliability of the device is improved; during the assembly of the device, the light transmission plate is fixed at the junction of the handle and the transverse cavity through the snap type structure, and no environmental light leaks from the gap, so that the light transmission plate will not loosen even if the device shakes due to hand holding, the stray light suppression effect remains stable, and the imaging quality of the device in dynamic use is ensured.

[0069] Further,

[0070] The hole wall of the light transmission hole is polished, which can further reduce the diffuse reflection of the laser by the hole wall, avoid the formation of secondary stray light by the reflected light of the hole wall, and further optimize the imaging quality.

[0071] The hole wall of the light transmission hole is polished to reduce the surface roughness of the hole wall, which can reduce the diffuse reflection of the laser by the hole wall. The rough hole wall is easy to reflect the laser in multiple directions to form secondary stray light, which avoids the interference of the diffuse reflected light with the main image, further optimizes the imaging quality, and ensures that the light passing through the light transmission hole is mainly "directional transmission", and there is no image speckle caused by additional diffuse light.

[0072] Further,

[0073] The planar size of the light-transmitting plate is adapted to the mounting space at the junction of the pistol-shaped handle and the transverse cavity, which meets the requirement of stray light shielding range and does not exceed the miniaturized design size of the device shell.

[0074] A small camera recognition device, characterized in that it comprises:

[0075] A pistol-shaped shell, comprising a handle and a transverse cavity;

[0076] A laser emitter arranged in the transverse cavity;

[0077] A 50% transparent refractive mirror arranged in the transverse cavity, used to form a coaxial light path for laser emission and reflection reception, and a polarizing film is arranged above the refractive mirror;

[0078] A camera module arranged below the refractive mirror and corresponding to the light paths of the refractive mirror and the laser emitter;

[0079] The light-transmitting plate for the small camera recognition device described above is fixed at the junction of the handle and the transverse cavity and is the core stray light suppression component of the device imaging light path; the light-transmitting hole on the light-transmitting plate is offset to the side of the laser emitter relative to the geometric center of the light-transmitting plate and forms coaxial correspondence with the orthographic projection center of the 50% transparent refractive mirror and the optical axis center of the camera module, constituting a through light path for laser emission and reflection reception; the light-transmitting hole comprises a first right angle side, an oblique side, a second right angle side and an arc-shaped side connected in sequence; the extension lines at the connection points of the first right angle side and the second right angle side with the oblique side intersect perpendicularly; the length of the first right angle side is greater than that of the second right angle side; and the connection points between the first right angle side, the oblique side, the second right angle side and the arc-shaped side and the edge of the light-transmitting hole wall are all treated with continuous smooth fillets; the edge of the light-transmitting plate is provided with a buckle type fixing structure adapted to the pistol-shaped shell, which is tightly connected with the handle and the transverse cavity of the shell without assembly gap; and the projection area of the polarizing film in the transverse cavity completely covers the light-transmitting hole.

[0080] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application / invention, and the present application / invention is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present application / invention, and these modifications and improvements are also considered to be within the protection scope of the present application / invention.

Claims

1. A light transmission plate for a small camera recognition device, applied to a small camera recognition device with a pistol-shaped shell, the pistol-shaped shell comprising a handle and a transverse cavity, the device being further configured with a laser emitter arranged in the transverse cavity, a 50% transparent refracting mirror for forming a coaxial light path, and a polarizing film above the refracting mirror and a camera module below the refracting mirror, characterized in that: the light transmission plate is fixed at the junction of the handle and the transverse cavity and is a core stray light suppression component of the imaging light path of the device; the light transmission plate corresponds to the position directly below the 50% transparent refracting mirror and the position directly above the camera module inside the device, and forms a coaxial corresponding relationship with the light path of the laser emitter, the refracting mirror and the camera module; the light transmission plate is provided with a light transmission hole determined through multiple rounds of optimization tests, and the light transmission hole is the hole position on the light transmission plate with the optimal suppression effect on the reflection path of stray light; the core function of the light transmission plate is to block stray light formed by the reflection of ambient light through the front and back surfaces of the light transmission plate from entering the imaging light path, so as to avoid the formation of a virtual image separated from or overlapped with the main image on the image plane of the camera module; the light transmission hole is offset to the side of the laser emitter relative to the geometric center of the light transmission plate, and forms a coaxial correspondence with the center of the orthographic projection of the 50% transparent refracting mirror and the optical axis center of the camera module inside the device, thereby constituting a through light path for laser emission-reflection reception, the light transmission hole comprises a first right angle side, an oblique side, a second right angle side and an arc side connected in sequence, the extension lines of the connection positions of the first right angle side and the second right angle side with the oblique side intersect perpendicularly, the length of the first right angle side is greater than that of the second right angle side, the connection positions between the first right angle side, the oblique side, the second right angle side and the arc side are subjected to continuous smooth round corner processing, and the edges of the hole wall of the light transmission hole are subjected to continuous smooth round corner processing. The light transmission hole corresponds to the position of the polarizing film inside the device, and the projection area of the polarizing film in the transverse cavity completely covers the light transmission hole, so that the light passing through the light transmission hole enters the imaging light path after being filtered by the polarizing film. The material of the light transmission plate is a high-transmittance optical material selected from optical resin or optical glass, and no multi-layer anti-reflection coating is arranged on the front and back surfaces of the light transmission plate. The determination process of the light transmission hole through multiple rounds of optimization tests is as follows: the candidate hole positions on the light transmission plate with different positions, different shapes and different sizes are tested one by one, and the pictures collected by the camera module are compared in real time, so as to finally determine the optimal hole position. The structural design of the light transmission plate is adapted to the internal light path layout of the device, the light shielding area of the light transmission plate covers the area where the ambient light is reflected into the imaging light path, and the light transmission hole matches the light path for laser emission-reflection reception. The edge of the light transmission plate is provided with a buckle type fixing structure matched with the pistol-shaped shell, and the handle and the transverse cavity of the shell are tightly connected through the structure without assembly gap.

2. The light transmission plate for a small camera recognition device according to claim 1, wherein The hole wall of the light transmission hole is subjected to polishing treatment.

3. The light transmission plate for a small camera recognition device according to claim 1, wherein The planar size of the light transmission plate is matched with the mounting space at the junction of the handle and the transverse cavity of the pistol-shaped shell, and the light shielding area of the light transmission plate covers the area where the ambient light is possibly reflected into the imaging light path.

4. The light transmission plate for a small camera recognition device according to claim 1, wherein The pistol-shaped shell comprises a handle and a transverse cavity; 5. The light transmission plate for a small camera recognition device according to claim 1, wherein The laser emitter is arranged in the transverse cavity; 6. The light transmission plate for a small camera recognition device according to claim 1, wherein ​ 7. The light transmission plate for a small camera recognition device according to claim 1, wherein ​ 8. The light transmission plate for a small camera recognition device according to claim 1, wherein ​ 9. A small camera recognition device, characterized by, ​ ​ ​ 50% transmittance refractive mirror, which is arranged in the transverse cavity and used for forming a coaxial light path of laser emission-reflection reception, and a polaroid film arranged above the refractive mirror; a camera module, which is arranged below the refractive mirror and corresponds to the light path of the refractive mirror and the laser emitter; a light-transmitting plate for a small camera recognition device according to any one of claims 1-8, which is fixed at the junction of the handle and the transverse cavity and is a core stray light suppression component of the imaging light path of the device; a light-transmitting hole on the light-transmitting plate is offset to the laser emitter side relative to the geometric center of the light-transmitting plate and coaxially corresponds to the center of the normal projection of the 50% transmittance refractive mirror and the optical axis center of the camera module, thereby forming a through light path of laser emission-reflection reception; the light-transmitting hole comprises a first right angle side, an oblique side, a second right angle side and an arc side connected in sequence; the extension lines of the connection positions of the first right angle side and the second right angle side with the oblique side are perpendicular to each other; the length of the first right angle side is greater than that of the second right angle side; the connection positions between the first right angle side, the oblique side, the second right angle side and the arc side and the edge of the hole wall of the light-transmitting hole are all processed by continuous smooth fillets; the edge of the light-transmitting plate is provided with a buckle type fixing structure matched with the pistol-shaped shell, and the handle and the transverse cavity of the shell are tightly connected without assembly gap through the structure; the projection area of the polaroid film in the transverse cavity completely covers the light-transmitting hole.

Images