Light-transmitting plate for small camera recognition device

Abstract

The invention discloses a light-transmitting plate for a small camera recognition device. A shell comprises a handle and a transverse cavity, and the device is provided with a laser transmitter of the transverse cavity, a refractor with 50% transparency (a polarizing film is arranged above) and a camera module below. The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, is an imaging light path core stray light suppression component and is made of high-light-transmitting optical resin or glass, and the front surface and the rear surface of the light-transmitting plate are not provided with multiple layers of anti-reflection coating films. The light-transmitting hole is determined through multiple rounds of optimization tests, deviates towards the laser side along the central axis of the transverse cavity relative to the geometric center and is coaxial with the orthographic projection of the refractor and the optical axis of the camera, the hole wall is polished and provided with a round corner, and the plate edge is provided with a buckle type structure to achieve gapless fixation. The light-transmitting plate can block stray light and prevent virtual images, cooperates with the polarizing film to improve the picture purity, can reduce ghosting, improves the transparent contrast ratio, adapts to the miniaturized design, and meets the requirement for low-intensity light collection.

Description

Technical Field

[0001] This invention relates to the field of optical transmission and stray light suppression, and specifically to a light-transmitting plate for a small camera recognition device. Background Technology

[0002] In the field of small camera recognition devices, products with pistol-shaped housings are often used in close-range target precision recognition scenarios due to their portability and handheld operation advantages. In order to improve imaging accuracy, such devices often introduce the cat's eye effect—that is, a laser is emitted by a laser emitter, and after the laser is reflected by the target surface, it returns along the original optical path and is guided to the camera module by a 50% transparency refracting mirror. This effect is used to achieve efficient target capture and imaging, which is compatible with the structural characteristics of the pistol-shaped housing, which integrates the "handle grip and transverse cavity optical path".

[0003] However, current devices utilizing the cat's-eye effect face key technological bottlenecks: Due to the miniaturization of the housing, the internal optical path space is compact, making the coaxial optical path of laser emission-reflection-reception extremely sensitive to stray light. Existing light-transmitting components have significant design flaws: either the light-transmitting aperture is not optimized and cannot accurately match the coaxial optical path of the cat's-eye effect, resulting in excessively high effective laser loss or insufficient stray light suppression; or, the use of multi-layer anti-reflection coatings introduces additional stray light due to the reflection of ambient light by the coating layers; furthermore, gaps exist in the assembly of some light-transmitting components with the junction of the pistol-shaped housing handle and the transverse cavity, further exacerbating the stray light problem. Additionally, the dimensions often do not match the installation space, making it difficult to balance stray light blocking with the miniaturization requirements of the device. These problems directly restrict the imaging quality and environmental adaptability of the cat's-eye effect in small pistol-shaped housing camera recognition devices, necessitating targeted optimization of the light-transmitting components to overcome these bottlenecks. Summary of the Invention

[0004] The purpose of this invention is to provide a light-transmitting plate for a small camera recognition device, thereby solving the problems mentioned in the background art.

[0005] This invention is achieved through the following technical solution: A light-transmitting plate for a small camera recognition device is applied to a small camera recognition device with a pistol-shaped housing. The pistol-shaped housing includes a handle and a transverse cavity. The device is also equipped with a laser emitter in the transverse cavity, a 50% transparent refractive mirror for forming a coaxial optical path, a polarizing film above the refractive mirror, and a camera module below the refractive mirror. The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is the core stray light suppression component of the imaging optical path of the device. The light-transmitting plate has light-transmitting holes that have been determined through multiple rounds of optimization tests. These light-transmitting holes are the holes on the light-transmitting plate that have the best effect on suppressing stray light reflection paths. The core function of the light-transmitting plate is to block stray light formed by the reflection of ambient light through its front and rear surfaces from entering the imaging optical path, thereby preventing stray light from forming a virtual image that overlaps with or separates from the main image on the image plane of the camera module. The light-transmitting hole is offset towards the laser emitter side relative to the geometric center of the light-transmitting plate, and is coaxially aligned with the orthographic projection center of the 50% transparency refractor inside the device and the optical axis center of the camera module, forming a through optical path for laser emission-reflection and reception. The light-transmitting hole includes a first right-angled side, a hypotenuse, a second right-angled side, and an arc side connected end to end in sequence. The extension lines of the first right-angled side and the second right-angled side intersect and are perpendicular to the hypotenuse at the connection point, and the side length of the first right-angled side is greater than that of the second right-angled side. The connection points between the first right-angled side, the hypotenuse, the second right-angled side, and the arc side are continuously and smoothly rounded, and the edge treatment of the light-transmitting hole wall forms a continuously smooth rounded corner.

[0006] Furthermore, The light-transmitting plate is located directly below the 50% transparency refractor inside the device and directly above the camera module, forming a coaxial correspondence with the optical paths of the laser emitter, the refractor, and the camera module.

[0007] Furthermore, The light-transmitting hole corresponds to the position of the polarizing film inside the device. The polarizing film completely covers the light-transmitting hole in the projection area of ​​the transverse cavity, so that the light passing through the light-transmitting hole is filtered by the polarizing film and then enters the imaging optical path.

[0008] Furthermore, The light-transmitting plate is made of a high-transmittance optical material, selected from optical resin or optical glass, and no multi-layer anti-reflective coating is applied to the front and back surfaces of the light-transmitting plate.

[0009] Furthermore, The process of determining the light-transmitting hole through multiple rounds of optimization tests is as follows: By conducting occlusion tests on candidate holes of different positions, shapes, and sizes on the light-transmitting plate one by one, and comparing the images captured by the camera module in real time, the optimal hole position is finally determined.

[0010] Furthermore, The structure of the light-transmitting plate is adapted to the internal optical path layout of the device, and the light-transmitting hole matches the optical path of laser emission-reflection and reception.

[0011] Furthermore, The edge of the light-transmitting plate is provided with a snap-fit ​​fixing structure that is compatible with the pistol-shaped shell. Through this structure, it is tightly connected to the handle and transverse cavity of the shell without any assembly gap.

[0012] Furthermore, The walls of the light-transmitting aperture are polished to further reduce diffuse reflection of the laser light, prevent secondary stray light from being formed by reflected light from the aperture walls, and further optimize the imaging quality.

[0013] Furthermore, The walls of the light-transmitting holes are polished.

[0014] Furthermore, The planar dimensions of the light-transmitting plate are adapted to the installation space at the junction of the pistol-shaped housing handle and the transverse cavity. Its light-shielding area covers the area where ambient light may be reflected into the imaging light path, without exceeding the miniaturized design dimensions of the device housing.

[0015] Furthermore, A small camera recognition device, characterized in that it comprises: A pistol-shaped housing, the pistol-shaped housing including a handle and a transverse cavity; A laser emitter, wherein the laser emitter is disposed within a transverse cavity; A refracting mirror with 50% transparency is disposed in a transverse cavity to form a coaxial optical path for laser emission-reflection and reception, and a polarizing film is provided above the refracting mirror; A camera module is positioned below the refractive mirror and corresponds to the optical path of the refractive mirror and the laser emitter. The light-transmitting plate for the small camera recognition device described in any of the above-mentioned embodiments is fixed at the junction of the handle and the transverse cavity, and is the core stray light suppression component of the imaging optical path of the device; the light-transmitting hole on the light-transmitting plate is offset relative to the geometric center of the light-transmitting plate towards the laser emitter side, and forms a coaxial correspondence with the orthogonal projection center of the 50% transparency refractor and the optical axis center of the camera module, constituting a through optical path for laser emission-reflection and reception, and the light-transmitting hole includes a first right-angled side, a hypotenuse, and a right-angled side connected end to end in sequence. The extensions of the second right-angled side and the curved side, the first right-angled side and the second right-angled side, and the hypotenuse are intersected and perpendicular. The side length of the first right-angled side is greater than that of the second right-angled side. The connection points between the first right-angled side, the hypotenuse, the second right-angled side, and the curved side, as well as the edges of the light-transmitting hole walls, are all treated with continuous and smooth rounded corners. The edge of the light-transmitting plate is provided with a snap-fit ​​fixing structure adapted to the pistol-shaped shell. Through this structure, it is tightly connected to the handle and transverse cavity of the shell without any assembly gap. The polarizing film completely covers the light-transmitting hole in the projection area of ​​the transverse cavity.

[0016] The beneficial effects of this invention are as follows: 1. As the core stray light suppression component in the imaging optical path of the device, the light-transmitting plate can accurately block stray light formed by the reflection of ambient light from its front and rear surfaces from entering the optical path, thus preventing stray light from forming a virtual image that overlaps with or separates from the main image on the image plane of the camera module. In practical applications, this design can significantly reduce the ghosting energy formed by stray light, while greatly improving the transparency and contrast of the image captured by the camera. It can not only meet the clear imaging requirements under normal lighting conditions, but also solve the problems of blurry images and loss of details in low-light environments, ensuring that the color, outline, texture and other details of objects are always clearly distinguishable, significantly expanding the applicable scenarios of the device.

[0017] 2. The light-transmitting aperture is precisely designed, located on the central axis of the light-transmitting plate along the transverse cavity extension direction, offset from the geometric center towards the laser emitter. Simultaneously, it forms a strict coaxial correspondence with the orthographic projection center of the 50% transparency refractor inside the device and the optical axis center of the camera module. This coaxial design ensures a complete optical path without misalignment from laser emission to reflection by the refractor to the light-transmitting aperture to camera reception, completely avoiding the waste of effective laser energy due to optical path misalignment. Compared to the traditional geometric center aperture design of the light-transmitting plate, this coaxial structure can control effective laser loss to an extremely low level, laying the foundation for the camera module to stably receive effective laser signals, ensuring imaging efficiency and image brightness, and avoiding the problem of dim images caused by insufficient laser energy.

[0018] 3. The position of the light-transmitting aperture precisely corresponds to that of the polarizing film within the device, and the projection area of ​​the polarizing film in the horizontal cavity completely covers the light-transmitting aperture. This ensures that all light passing through the aperture must first be filtered by the polarizing film before entering the imaging optical path. The polarizing film can specifically filter out stray polarized light in the environment, which is often one of the main causes of "haze" and "bright spots" in images. Through this collaborative design, "haze" in the image can be effectively eliminated. Even in low-light environments with complex lighting, the image captured by the camera maintains extremely high purity, with no blurry halos around object edges and more accurate detail rendering, providing a high-quality image foundation for subsequent image recognition and feature extraction.

[0019] 4. The position of the light-transmitting aperture is not arbitrarily set, but rather determined by conducting occlusion tests on candidate apertures of different positions, shapes, and sizes on the light-transmitting plate, and comparing the results with the real-time images captured by the camera module. This process can accurately select aperture positions that "maximally reduce ghosting effects while minimizing effective laser loss," completely solving the single-minded defects of traditional aperture design that "emphasize ghosting suppression while neglecting laser loss" or "emphasize laser utilization while neglecting stray light control." Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the position of the light-transmitting plate; Figure 2 A diagram illustrating the process of creating light-transmitting holes on a light-transmitting plate; Figure 3 for Figure 2 Schematic diagram of holes 1 to 6 in the middle; Figure 4 for Figure 2 A schematic diagram of the effect of hole No. 7 in the middle. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0022] See the example. Figures 1 to 4 : A light-transmitting plate for a small camera recognition device is applied to a small camera recognition device with a pistol-shaped housing. The pistol-shaped housing includes a handle and a transverse cavity. The device is also equipped with a laser emitter in the transverse cavity, a 50% transparent refractive mirror for forming a coaxial optical path, a polarizing film above the refractive mirror, and a camera module below the refractive mirror. The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is the core stray light suppression component of the imaging optical path of the device. The light-transmitting plate has light-transmitting holes that have been determined through multiple rounds of optimization tests. These light-transmitting holes are the holes on the light-transmitting plate that have the best effect on suppressing stray light reflection paths. The core function of the light-transmitting plate is to block stray light formed by the reflection of ambient light through its front and rear surfaces from entering the imaging optical path, thereby preventing stray light from forming a virtual image that overlaps with or separates from the main image on the image plane of the camera module. The light-transmitting hole is offset towards the laser emitter side relative to the geometric center of the light-transmitting plate, and is coaxially aligned with the orthographic projection center of the 50% transparency refractor inside the device and the optical axis center of the camera module, forming a through optical path for laser emission-reflection and reception. The light-transmitting hole includes a first right-angled side, a hypotenuse, a second right-angled side, and an arc side connected end to end in sequence. The extension lines of the first right-angled side and the second right-angled side intersect and are perpendicular to the hypotenuse at the connection point, and the side length of the first right-angled side is greater than that of the second right-angled side. The connection points between the first right-angled side, the hypotenuse, the second right-angled side, and the arc side are continuously and smoothly rounded, and the edge treatment of the light-transmitting hole wall forms a continuously smooth rounded corner.

[0023] Furthermore, The light-transmitting hole is located below the 50% transparency refraction mirror inside the device and above the camera module, forming a coaxial correspondence with the refraction mirror and the camera module.

[0024] The light-transmitting aperture is precisely aligned with the area directly below the refractor and above the camera module, forming a coaxial optical path with the laser emitter, refractor, and camera module. Its core advantage is ensuring a complete, unbiased optical path from laser emission to reflection by the refractor, through the light-transmitting aperture, and finally to camera reception. This avoids effective laser energy loss due to optical path misalignment, laying a stable foundation for clear imaging. In practical applications of small camera recognition devices with pistol-shaped housings, after the laser emitter emits laser light, the laser is reflected by a 50% transparent refractor and smoothly passes through the light-transmitting aperture along a coaxial path, ultimately being accurately received by the camera module. This prevents laser waste due to optical path deviation, ensuring basic imaging efficiency and eliminating optical path-level deviations in subsequent image acquisition.

[0025] Furthermore, The light-transmitting hole corresponds to the position of the polarizing film inside the device. The polarizing film completely covers the light-transmitting hole in the projection area of ​​the transverse cavity, so that the light passing through the light-transmitting hole is filtered by the polarizing film and enters the imaging light path, which can further improve the purity of the image.

[0026] The projection of the polarizing film onto the transverse cavity completely covers the light-transmitting aperture, ensuring that light passing through the aperture must be filtered by the polarizing film before entering the imaging optical path. This effectively filters out stray polarized light (such as reflected polarized light from the environment) passing through the aperture, further reducing interference from ineffective light and significantly improving image purity. It also avoids the "hazy" or "spot-like" appearance caused by stray polarized light. This design is particularly effective in low-light environments (such as indoor low-light scenes), where stray polarized light is completely filtered by the polarizing film before reaching the aperture. The images of objects captured by the camera module do not exhibit a "hazy" appearance, and details such as the edges and textures of objects are clearly presented, significantly improving image quality in low-light environments.

[0027] Furthermore, The light-transmitting plate is made of a high-transmittance optical material, selected from optical resin or optical glass, and no multi-layer anti-reflective coating is applied to the front and back surfaces of the light-transmitting plate.

[0028] High light transmittance materials can minimize the absorption and loss of effective laser and reflected light, ensuring smooth light transmission. Without the need for multiple anti-reflection coatings, the coating layer can avoid generating additional stray light due to reflection of ambient light, thus achieving a balance between light transmittance and stray light suppression.

[0029] Furthermore, The process of determining the light-transmitting hole through multiple rounds of optimization tests is as follows: By conducting occlusion tests on candidate holes of different positions, shapes, and sizes on the light-transmitting plate one by one, and comparing the images captured by the camera module in real time, the hole position is finally determined among all candidate hole positions, which can minimize the ghosting effect to the greatest extent and minimize the effective laser loss.

[0030] In one embodiment, such as Figure 2 Through continuous occlusion, the optimal aperture position was determined, minimizing the "ghosting" (virtual image) effect caused by stray light while minimizing effective laser loss. This avoided performance defects caused by trial and error with a single parameter (such as reducing the aperture size solely to suppress ghosting, resulting in excessive laser loss). During the experiment, a comparison was made between a "circular hole at the geometric center of the light-transmitting plate" and a "hole offset towards the laser side." Although the former was simpler to manufacture, it resulted in obvious ghosting in the camera image. The latter, after testing, showed a decrease in ghosting energy and a reduction in effective laser loss. Ultimately, this offset aperture position was determined to be the optimal choice. After being applied to the device, it effectively resolved the conflicting issues of ghosting and laser loss. Figure 2 The effect of holes 1 to 6 is as follows Figure 3 As shown, Figure 2 The effect of hole No. 7 is as follows Figure 4 As shown, Figure 4 and Figure 3 In comparison, the reflected red light is significantly reduced and the ghosting is weakened, and Figure 4 The background is clearer, making it easier to pinpoint the location of the bright spots in the image.

[0031] The stray light suppression effect of the light-transmitting plate is specifically manifested in the reduction of ghosting energy caused by stray light, the improvement of the transparency and contrast of the image captured by the camera module, and the satisfaction of image capture requirements in low-light environments.

[0032] Addressing the core pain point of "stray light causing ghosting and blurry images," the practicality of the light-transmitting plate was verified from an effectiveness perspective. At the same time, the applicable scenarios of the device were expanded, enabling the device to not only work in normal light conditions but also to stably capture clear images in low-light environments, thus improving environmental adaptability. In an outdoor environment at dusk, the image captured by the device without the light-transmitting plate showed obvious ghosting, while after installing the light-transmitting plate, the ghosting energy decreased, the image transparency was significantly improved, and the color and outline details of objects could be clearly captured, fully meeting the recognition and imaging needs in low-light scenes.

[0033] Furthermore, The edge of the light-transmitting plate is provided with a snap-on fixing structure that is compatible with the pistol-shaped shell. Through this structure, it is tightly connected to the handle and transverse cavity of the shell without any assembly gaps, thus avoiding the leakage of extra stray light due to gaps and ensuring that the stray light suppression effect of the light-transmitting plate is stable and reliable.

[0034] This design ensures a tight connection between the light-transmitting plate and the housing handle and transverse cavity without any assembly gaps. This eliminates "gap light leakage," preventing ambient light from entering the imaging optical path through the assembly gaps and introducing additional stray light. It also ensures the light-transmitting plate remains in place and its stray light suppression effect does not diminish over long-term use, thus improving device reliability. During assembly, the light-transmitting plate is fixed to the junction of the handle and transverse cavity using a snap-fit ​​structure, preventing any ambient light from leaking in through the gaps. Even if the device is shaken by hand, the light-transmitting plate will not loosen, maintaining a stable stray light suppression effect and ensuring image quality during dynamic use.

[0035] Furthermore, The walls of the light-transmitting aperture are polished to further reduce diffuse reflection of the laser light, prevent secondary stray light from being formed by reflected light from the aperture walls, and further optimize the imaging quality.

[0036] Polishing the walls of the light-transmitting aperture reduces surface roughness, thereby minimizing diffuse reflection of the laser light. Rougher aperture walls cause the laser to reflect in multiple directions, creating secondary stray light. This prevents diffuse reflection from entering the imaging optical path and interfering with the main image, further optimizing image quality and ensuring that the light passing through the aperture is primarily "directionally transmitted," without additional diffuse reflection causing image artifacts.

[0037] Furthermore, The planar dimensions of the light-transmitting plate are adapted to the installation space at the junction of the pistol-shaped housing handle and the transverse cavity, which satisfies the requirements for stray light blocking range without exceeding the miniaturized design dimensions of the device housing.

[0038] A small camera recognition device, characterized in that it comprises: A pistol-shaped housing, the pistol-shaped housing including a handle and a transverse cavity; A laser emitter, wherein the laser emitter is disposed within a transverse cavity; A refracting mirror with 50% transparency is disposed in a transverse cavity to form a coaxial optical path for laser emission-reflection and reception, and a polarizing film is provided above the refracting mirror; A camera module is positioned below the refractive mirror and corresponds to the optical path of the refractive mirror and the laser emitter. The aforementioned light-transmitting plate for a small camera recognition device is fixed at the junction of the handle and the transverse cavity, serving as a core stray light suppression component in the device's imaging optical path. The light-transmitting hole on the plate is offset relative to the geometric center of the plate towards the laser emitter, and is coaxially aligned with the projection center of the 50% transparency refractor and the optical axis center of the camera module, forming a through-path for laser emission-reflection and reception. The light-transmitting hole includes a first right-angled side, a hypotenuse, a second right-angled side, and an arc-shaped side connected sequentially. The extension lines of the first and second right-angled sides intersect and are perpendicular to the hypotenuse. The side length of the first right-angled side is greater than that of the second right-angled side. The connections between the first right-angled side, the hypotenuse, the second right-angled side, and the arc-shaped side, as well as the edges of the light-transmitting hole walls, are all continuously and smoothly rounded. The edge of the light-transmitting plate is equipped with a snap-fit ​​fixing structure adapted to the pistol-shaped housing, allowing for a tight connection with the housing's handle and transverse cavity without any assembly gaps. The polarizing film completely covers the light-transmitting hole in the projection area of ​​the transverse cavity.

[0039] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A light-transmitting plate for a small camera recognition device, applied to a small camera recognition device having a pistol-shaped housing, the pistol-shaped housing including a handle and a transverse cavity, the device further comprising a laser emitter in the transverse cavity, a 50% transparent refractive mirror for forming a coaxial optical path, a polarizing film above the refractive mirror, and a camera module below the refractive mirror, characterized in that, The light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is the core stray light suppression component of the imaging optical path of the device. The light-transmitting plate has light-transmitting holes that have been determined through multiple rounds of optimization tests. These light-transmitting holes are the holes on the light-transmitting plate that have the best effect on suppressing stray light reflection paths. The core function of the light-transmitting plate is to block stray light formed by the reflection of ambient light through its front and rear surfaces from entering the imaging optical path, thereby preventing stray light from forming a virtual image that overlaps with or separates from the main image on the image plane of the camera module. The light-transmitting hole is offset towards the laser emitter side relative to the geometric center of the light-transmitting plate, and is coaxially aligned with the orthographic projection center of the 50% transparency refractor inside the device and the optical axis center of the camera module, forming a through optical path for laser emission-reflection and reception. The light-transmitting hole includes a first right-angled side, a hypotenuse, a second right-angled side, and an arc side connected end to end in sequence. The extension lines of the first right-angled side and the second right-angled side intersect and are perpendicular to the hypotenuse at the connection point, and the side length of the first right-angled side is greater than that of the second right-angled side. The connection points between the first right-angled side, the hypotenuse, the second right-angled side, and the arc side are continuously and smoothly rounded, and the edge treatment of the light-transmitting hole wall forms a continuously smooth rounded corner.

2. The light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The light-transmitting plate is located directly below the 50% transparency refractor inside the device and directly above the camera module, forming a coaxial correspondence with the optical paths of the laser emitter, the refractor, and the camera module.

3. The light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The light-transmitting hole corresponds to the position of the polarizing film inside the device. The polarizing film completely covers the light-transmitting hole in the projection area of ​​the transverse cavity, so that the light passing through the light-transmitting hole is filtered by the polarizing film and then enters the imaging optical path.

4. A light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The light-transmitting plate is made of a high-transmittance optical material, selected from optical resin or optical glass, and no multi-layer anti-reflective coating is applied to the front and back surfaces of the light-transmitting plate.

5. A light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The process of determining the light-transmitting hole through multiple rounds of optimization tests is as follows: By conducting occlusion tests on candidate holes of different positions, shapes, and sizes on the light-transmitting plate one by one, and comparing the images captured by the camera module in real time, the optimal hole position is finally determined.

6. A light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The structure of the light-transmitting plate is adapted to the internal optical path layout of the device. Its light-blocking area covers the area where ambient light is reflected into the imaging optical path, and the light-transmitting hole matches the optical path of laser emission-reflection and reception.

7. A light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The edge of the light-transmitting plate is provided with a snap-fit ​​fixing structure that is compatible with the pistol-shaped shell. Through this structure, it is tightly connected to the handle and transverse cavity of the shell without any assembly gap.

8. A light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The walls of the light-transmitting holes are polished.

9. A light-transmitting plate for a small camera recognition device according to claim 1, characterized in that, The planar dimensions of the light-transmitting plate are adapted to the installation space at the junction of the pistol-shaped housing handle and the transverse cavity, and its light-blocking area covers the area where ambient light may be reflected into the imaging light path.

10. A small camera recognition device, characterized in that, include: A pistol-shaped housing, the pistol-shaped housing including a handle and a transverse cavity; A laser emitter, wherein the laser emitter is disposed within a transverse cavity; A refracting mirror with 50% transparency is disposed in a transverse cavity to form a coaxial optical path for laser emission-reflection and reception, and a polarizing film is provided above the refracting mirror; A camera module is positioned below the refractive mirror and corresponds to the optical path of the refractive mirror and the laser emitter. A light-transmitting plate for a small camera recognition device as described in any one of claims 1-9, wherein the light-transmitting plate is fixed at the junction of the handle and the transverse cavity, and is a core stray light suppression component for the imaging optical path of the device; the light-transmitting hole on the light-transmitting plate is offset relative to the geometric center of the light-transmitting plate toward the laser emitter side, and forms a coaxial correspondence with the orthogonal projection center of the 50% transparency refractor and the optical axis center of the camera module, constituting a through optical path for laser emission-reflection and reception, wherein the light-transmitting hole includes a first right-angled side connected end to end in sequence, The hypotenuse, the second right-angled side, and the arc-shaped side are provided. The extensions of the first right-angled side and the second right-angled side intersect and are perpendicular to each other at the connection point with the hypotenuse. The side length of the first right-angled side is greater than that of the second right-angled side. The connection points between the first right-angled side, the hypotenuse, the second right-angled side, and the arc-shaped side, as well as the edges of the light-transmitting hole walls, are all treated with continuous and smooth rounded corners. The edge of the light-transmitting plate is provided with a snap-fit ​​fixing structure adapted to the pistol-shaped shell. Through this structure, it is tightly connected to the handle and the transverse cavity of the shell without any assembly gap. The polarizing film completely covers the light-transmitting hole in the projection area of ​​the transverse cavity.

Images