Detection equipment for camera

By designing camera detection equipment, the automatic detection of the camera is achieved by using the placement module and the driving module of the detection module, the problems of low detection efficiency and harmful to the eyes in the prior art are solved, and the detection efficiency and safety are improved.

CN223297644UActive Publication Date: 2025-09-02DONGGUAN GUANGDA INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202422621752.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-29
Publication Date
2025-09-02
Estimated Expiration
2034-10-29

AI Technical Summary

Technical Problem

In the prior art, camera detection efficiency is low and harmful to the eyes of the detector, so automated detection cannot be achieved.

Method used

A camera detection device is designed, including a placement module, a first drive module, a detection module and a second drive module. The coordinated function of the drive module realizes automatic detection of the camera. A multiple storage bits are provided on the placement module, and the detection module can move in different directions to detect multiple cameras.

Benefits of technology

The automatic detection of the camera is realized, the detection efficiency is improved, the damage to the eyes of the detector is reduced, and multiple cameras can be detected simultaneously.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses detection equipment for a camera. The detection equipment comprises a placement module, a first driving module, a detection module and a second driving module. A plurality of storage positions are formed on the placement module; the first driving module is in driving connection with the placement module; the detection module corresponds to the second position; the second driving module is in driving connection with the detection module. The first driving module drives the placing module used for placing the camera to move between the first position and the second position, so that feeding and discharging of the camera are facilitated, the camera is conveniently moved to the position below the detection module, the detection module can detect the camera on the placing module, and therefore automatic detection of the camera is achieved, and the detection efficiency is improved. And the detection efficiency is high. And a plurality of storage positions are distributed on the placement module in the second direction, and the second driving module can drive the detection module to move in the second direction, so that the detection of a plurality of cameras can be completed under the condition that the placement module is fed once, and the detection efficiency is further improved.
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Description

Technical Field

[0001] The present application relates to the technical field of detection devices, and in particular to a camera detection device. Background Art

[0002] During the production process, cameras need to be inspected. In related technologies, the camera is placed under a metallographic microscope, and inspectors use the microscope to inspect with the naked eye. The inspection efficiency is low, and the long-term inspection through manual visual inspection can easily cause damage to the inspectors' eyes. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a camera detection device that can automatically detect cameras and improve detection efficiency.

[0004] A camera detection device according to an embodiment of the present application includes: a placement module, a first driving module, a detection module, and a second driving module.

[0005] The placement module is formed with a plurality of storage locations for placing cameras, and the storage locations are distributed along the second direction;

[0006] The first driving module is drivingly connected to the placement module, and is used to drive the placement module to move along a first direction, so that the placement module moves between a first position and a second position;

[0007] The detection module is provided corresponding to the second position and is used to detect the camera on the placement module located at the second position;

[0008] A second driving module is drivingly connected to the detection module and is used to drive the detection module to move along a second direction, wherein the first direction and the second direction intersect.

[0009] According to an embodiment of the present application, a camera detection device has at least the following beneficial effects: the camera detection device of the present application drives a placement module for placing a camera to move between a first position and a second position via a first drive module, so as to facilitate loading and unloading of the camera and to facilitate moving the camera to the bottom of the detection module. The detection module can detect the camera on the placement module, thereby realizing automated detection of the camera with high detection efficiency. In addition, the placement module has multiple storage locations distributed along the second direction, and the second drive module can drive the detection module to move along the second direction, so as to complete the detection of multiple cameras while loading the placement module once, further improving the detection efficiency.

[0010] According to some embodiments of the present application, a vacuuming module is further included, the placement module is provided with adsorption holes corresponding to the storage positions, and the vacuuming module is connected to the adsorption holes.

[0011] According to some embodiments of the present application, the placement module includes an adsorption seat and a base, the adsorption seat is formed with the adsorption hole, the adsorption seat is provided with a groove, the base is detachably arranged in the groove, and the first driving module is driven to connect the base.

[0012] According to some embodiments of the present application, the adsorption seat is further formed with an adsorption chamber, the adsorption chamber is connected to the adsorption holes at the plurality of storage positions, and the adsorption chamber is connected to the vacuum module.

[0013] According to some embodiments of the present application, the placement module also includes a loading tray, which is provided with a plurality of limit slots, the limit slots being used to limit the camera, the limit slots corresponding one-to-one to the storage positions, and connecting holes being formed at the bottom of the limit slots, each of the limit slots being connected to the adsorption hole at the corresponding storage position through the connecting hole at its bottom.

[0014] According to some embodiments of the present application, the adsorption seat is formed with a plurality of protrusions, each of the protrusions is formed with the adsorption hole, and the protrusions are inserted into the communicating holes.

[0015] According to some embodiments of the present application, the loading tray forms convex edges on both sides along the first direction, the convex edges protrude from both sides of the adsorption seat along the first direction, and the base forms notches on both sides along the first direction, the notches are connected to the groove and correspond to the convex edges.

[0016] According to some embodiments of the present application, the placement module also includes a slide, the first drive module drives and connects the slide, the base and the first drive module are spaced apart, the base is provided with an air receiving channel, one end of the air receiving channel is connected to the air receiving port of the adsorption chamber, and the other end of the air receiving channel is connected to the vacuum module through a hose, and the hose passes through the gap between the base and the first drive module.

[0017] According to some embodiments of the present application, a sensing sheet is provided on the slide, and the first driving module is provided with sensors corresponding to the first position and the second position respectively, the sensors can sense the sensing sheet, and the sensors are electrically connected to the first driving module.

[0018] According to some embodiments of the present application, some of the storage bits are further distributed along the first direction.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic structural diagram of a camera detection device according to an embodiment of the present application;

[0022] Figure 2 This is a partial structural diagram of a camera detection device according to an embodiment of the present application;

[0023] Figure 3 for Figure 2 A schematic structural diagram of another direction of a camera detection device;

[0024] Figure 4 for Figure 2 Schematic diagram of the structure of the middle base;

[0025] Figure 5 for Figure 2 Schematic diagram of the structure of the middle adsorption seat;

[0026] Figure 6 for Figure 5 A cross-sectional view of the middle adsorption seat;

[0027] Figure 7 for Figure 5 Schematic diagram of the structure of the middle loading tray.

[0028] Reference numerals:

[0029] Placement module 100, base 110, groove 111, notch 112; adsorption seat 120, protrusion 121, adsorption chamber 122, air inlet 1221, storage position 123, adsorption hole 124; loading tray 130, convex edge 131, limiting groove 132, communication hole 133; slide 140, sensor plate 141;

[0030] First driving module 200, first position 210, second position 220; sensor 230;

[0031] A second driving module 300;

[0032] Housing 400;

[0033] Detection module 500. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0035] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0036] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0037] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0038] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0039] Reference Figure 2 According to an embodiment of the present application, a camera detection device includes: a placement module 100, a first driving module 200, a detection module 500 and a second driving module 300.

[0040] The placement module 100 is formed with a plurality of storage locations 123 for placing cameras, and the storage locations 123 are distributed along the second direction;

[0041] The first driving module 200 drives the placement module 100 to move along a first direction, so that the placement module 100 moves between a first position 210 and a second position 220;

[0042] The detection module 500 is provided corresponding to the second position 220 and is used to detect the camera on the placement module 100 located at the second position 220;

[0043] The second driving module 300 drives the connection detection module 500 to drive the detection module 500 to move along a second direction, wherein the first direction and the second direction intersect.

[0044] It will be appreciated that the placement module 100 is provided with a plurality of storage locations 123, each of which can accommodate a camera. When the placement module 100 is in the first position 210, it is positioned away from the inspection module 500, allowing for manual or robotic loading of cameras to be inspected onto the placement module 100 in the first position 210. After loading the placement module 100, the first drive module 200 drives the placement module 100 to move in a first direction, moving the placement module 100 from the first position 210 to the second position 220. When the placement module 100 reaches the second position 220, the detection module 500 detects the cameras on the placement module 100 located at the second position 220. It should be understood that the detection range of the detection module 500 is limited, and the second driving module 300 drives the detection module 500 in the second direction, which is the same as the distribution direction of the storage locations 123 on the placement module 100. Therefore, the second driving module 300 can drive the detection module 500 to move in the second direction to ensure that the detection module 500 can detect all cameras on the placement module 100. After the cameras are detected, the first driving module 200 drives the placement module 100 from the second position 220 to the first position 210, moving the placement module 100 away from the detection module 500, so that the cameras on the placement module 100 that have completed the inspection can be removed manually or by a robot.

[0045] In summary, the camera detection device of the present application drives a placement module 100 for placing a camera between a first position 210 and a second position 220 via a first drive module 200, thereby facilitating the loading and unloading of the camera and facilitating the movement of the camera below the detection module 500. The detection module 500 is capable of detecting the camera on the placement module 100, thereby achieving automated detection of the camera with high detection efficiency. Furthermore, the placement module 100 has multiple storage locations 123 distributed along a second direction, and the second drive module 300 is capable of driving the detection module 500 to move along the second direction, so that multiple cameras can be detected while loading the placement module 100 once, further improving detection efficiency.

[0046] In some other embodiments, the first driving module 200 can also drive the placement module 100 to move to a third position, with the first position 210, the second position 220, and the third position being distributed along the first direction. For example, when the placement module 100 moves to the first position 210, a human or robotic arm places the camera to be inspected on the placement module 100. When the placement module 100 moves to the second position 220, the inspection module 500 inspects the camera on the placement module 100. When the placement module 100 moves to the third position, a human or robotic arm unloads the inspected camera. It should be understood that by adding a third position dedicated to unloading, interference between loading and unloading robots or between loading and unloading workers can be avoided, thereby improving inspection efficiency.

[0047] Specifically, the placement module 100 is extended along the second direction, so that the placement module 100 can form a plurality of storage locations 123 in the second direction.

[0048] Specifically, the detection module 500 is an optical module.

[0049] Specifically, the camera is a camera of an electronic product, such as a camera of a mobile phone, a tablet or other electronic products.

[0050] Specifically, refer to Figure 1 A camera detection device of the present application also includes a housing 400, which covers a detection module 500, a second driving module 300 and a portion of the first driving module 200. When the placement module 100 moves to the first position 210, the placement module 100 is located outside the housing 400. When the placement module 100 moves to the second position 220, the placement module 100 is located inside the housing 400. Thus, the detection module 500 is protected by the housing 400, and a better detection environment can be created for the detection module 500, thereby reducing external interference, improving detection accuracy, and preventing the light generated during the detection process of the detection module 500 from damaging the worker's eyes.

[0051] Specifically, the first detection module 500 and the second detection module 500 are both linear modules.

[0052] Specifically, the second driving module 300 is mounted above the first driving module 200, symmetrically arranged about the first driving module 200. This reduces structural space and allows the detection module 500 to be initially positioned centrally with the second driving module 300, improving support stability for the detection module 500. Furthermore, the placement module 100 is also symmetrically arranged about the first driving module 200, reducing structural space while ensuring stable movement of the placement module 100.

[0053] Specifically, the first direction and the second direction are perpendicular to each other.

[0054] Reference Figure 5 According to some embodiments of the present application, a vacuum module (not shown in the figure) is further included. The placement module 100 is provided with an adsorption hole 124 corresponding to the storage position 123, and the vacuum module is connected to the adsorption hole 124.

[0055] It can be understood that the vacuum module is connected to the adsorption hole 124 so that the adsorption hole 124 can generate adsorption force, thereby enabling the camera to be adsorbed on the placement module 100 to limit the camera and prevent the camera from offsetting during the movement of the placement module 100, thereby ensuring the position accuracy of the camera.

[0056] Reference Figure 2 、 Figure 4 and Figure 5 According to some embodiments of the present application, the placement module 100 includes an adsorption seat 120 and a base 110, the adsorption seat 120 is formed with an adsorption hole 124, the adsorption seat 120 is provided with a groove 111, the base 110 is detachably arranged in the groove 111, and the first driving module 200 drives the connected base 110.

[0057] It is understood that the adsorption seat 120 is mounted on the base 110, and the base 110 is used to fix the adsorption seat 120. The first driving module 200 drives the adsorption seat 120 to move by driving the base 110. A storage position 123 is formed on the adsorption seat 120, and an adsorption hole 124 is formed on the storage position 123. The adsorption seat 120 is used to place and limit the camera. In addition, since the adsorption seat 120 and the base 110 are detachably connected to facilitate the disassembly and assembly of the adsorption seat 120, the base 110 can be adapted to different models of cameras by replacing different adsorption seats 120, and can be easily repaired and replaced.

[0058] Specifically, a groove 111 is formed in the middle of the base 110, and the adsorption seat 120 is arranged in the groove 111. The adsorption seat 120 is limited by the groove 111, and the adsorption seat 120 and the base 110 are fixed by fasteners passing through the adsorption seat 120 and the base 110.

[0059] Reference Figure 6 According to some embodiments of the present application, the adsorption seat 120 is further formed with an adsorption chamber 122 , the adsorption chamber 122 is connected to the adsorption holes 124 at the plurality of storage positions 123 , and the adsorption chamber 122 is connected to the vacuum module.

[0060] It can be understood that the interior of the adsorption seat 120 is hollowed to form an adsorption chamber 122 inside the adsorption seat 120, and an adsorption hole 124 is formed at the upper end of the adsorption seat 120. One adsorption chamber 122 can be connected to the adsorption holes 124 of multiple storage positions 123, and the adsorption chamber 122 can also be connected to the vacuum module, so that when the vacuum module is vacuumed, multiple adsorption holes 124 can generate adsorption force at the same time.

[0061] Reference Figure 5 and Figure 7 According to some embodiments of the present application, the placement module 100 also includes a loading tray 130, which is provided with a plurality of limiting grooves 132. The limiting grooves 132 are used to limit the camera. The limiting grooves 132 correspond one-to-one to the storage positions 123. A connecting hole 133 is formed at the bottom of the limiting groove 132. Each limiting groove 132 is connected to the adsorption hole 124 at the corresponding storage position 123 through the connecting hole 133 at its bottom.

[0062] It is understandable that the camera can be pre-placed in the limiting groove 132 of the loading tray 130, and the camera can be limited by the limiting groove 132. Then, the loading tray 130 is placed on the adsorption base 120, and the storage position 123 on the adsorption base 120 corresponds to the communication hole 133 on the loading tray 130, so that the adsorption hole 124 on the adsorption base 120 is correspondingly connected to the limiting groove 132 on the loading tray 130. As a result, each limiting groove 132 can be connected to the adsorption hole 124 on a storage position 123 through the communication hole 133 at its bottom, so as to ensure that the vacuum module can adsorb the camera in each limiting groove 132.

[0063] Specifically, the groove 111 on the base 110 has a certain depth, and the loading tray 130 is also located in the groove 111 .

[0064] Reference Figure 5 and Figure 7 According to some embodiments of the present application, the adsorption seat 120 is formed with a plurality of protrusions 121 , each protrusion 121 is formed with a adsorption hole 124 , and the protrusion 121 is inserted with a communication hole 133 .

[0065] It is understood that when the material loading tray 130 is placed on the adsorption base 120, the protrusion 121 is inserted into the communication hole 133. The protrusion 121 and the communication hole 133 are plugged into each other to further limit the position of the adsorption base 120 and the material loading tray 130. In addition, the adsorption hole 124 is formed on the protrusion 121 and inserted into the communication hole 133. This can reduce air leakage and can bring the adsorption hole 124 closer to the camera in the limiting groove 132, thereby improving the vacuum module's adsorption effect on the camera in the limiting groove 132.

[0066] Specifically, the height of the protrusion 121 is less than or equal to the depth of the communication hole 133 to prevent the protrusion 121 from passing through the communication hole 133 and hitting the camera, causing damage to the appearance of the camera.

[0067] Reference Figure 4 and Figure 7 According to some embodiments of the present application, the loading tray 130 forms convex edges 131 on both sides along the first direction, and the convex edges 131 protrude from both sides of the adsorption seat 120 along the first direction. The base 110 forms notches 112 on both sides along the first direction, and the notches 112 are connected to the groove 111 and correspond to the convex edges 131.

[0068] It can be understood that the loading tray 130 is formed with convex edges 131 on both sides along the first direction, so that the size of the loading tray 130 in the first direction is longer. Specifically, the size of the loading tray 130 in the first direction is larger than the size of the adsorption seat 120 in the first direction, so that the convex edges 131 of the loading tray 130 can protrude from both sides of the adsorption seat 120 in the first direction. In addition, since the base 110 forms notches 112 on both sides along the first direction, and the notches 112 are connected to the groove 111 and correspond to the convex edges 131, it is convenient for manual or robotic arms to grasp the convex edges 131 through the notches 112, thereby facilitating the removal of the loading tray 130 from the adsorption seat 120. Similarly, it is also convenient for manual or robotic arms to place the loading tray 130 on the adsorption seat 120.

[0069] Reference Figure 3 and Figure 6 According to some embodiments of the present application, the placement module 100 also includes a slide 140, the first driving module 200 drives the connected slide 140, the base 110 and the first driving module 200 are spaced apart, and the base 110 is provided with an air receiving channel (not shown in the figure), one end of the air receiving channel is connected to the air receiving port 1221 of the adsorption chamber 122, and the other end of the air receiving channel is connected to the vacuum module through a hose (not shown in the figure), and the hose passes through the gap between the base 110 and the first driving module 200.

[0070] It is understood that the first driving module 200 drives the base 110, the adsorption base 120, and the loading tray 130 by driving the slide 140. The first driving module 200 is connected to the slide 140, and the slide 140 has a certain height. The base 110 is set on the slide 140 so that the base 110 and the first driving module 200 are spaced apart. The base 110 forms an air receiving channel. When the adsorption seat 120 is placed on the base 110, one end of the air receiving channel is arranged opposite to the air receiving port 1221 of the adsorption chamber 122. One end of the air receiving channel is connected to the adsorption chamber 122 through the air receiving port 1221 of the adsorption chamber 122. The other end of the air receiving channel is formed on the outside of the base 110 to facilitate connection to the vacuum module through a hose. Thus, the vacuum module is connected to the adsorption chamber 122 through the air receiving channel on the base 110, so that the adsorption hole 124 generates suction. In addition, the vacuum module is connected to the base 110 through the hose. During the movement of the base 110, the hose can bend, reducing the impact of the movement of the base 110 on the adsorption effect. In addition, the hose can pass through the gap between the base 110 and the first drive module 200 to facilitate the arrangement of the hose and reduce the risk of squeezing the hose when the base 110 moves.

[0071] Reference Figure 3 According to some embodiments of the present application, a sensing sheet 141 is provided on the slide 140, and the first driving module 200 is provided with sensors 230 corresponding to the first position 210 and the second position 220 respectively. The sensor 230 can sense the sensing sheet 141, and the sensor 230 is electrically connected to the first driving module 200.

[0072] It can be understood that when the slide 140 moves to the first position 210 and the second position 220, the sensor 230 can sense the sensing plate 141, and the sensor 230 can feed back the signal of the sensing plate 141 to the first driving module 200, so that the first driving module 200 stops driving, so that the placement module 100 stops at the first position 210 or the second position 220.

[0073] Specifically, the sensor sheet 141 is disposed on the housing of the first driving module 200 .

[0074] According to some embodiments of the present application, some storage bits 123 are further distributed along the first direction.

[0075] It is understandable that some storage locations 123 can also be distributed along the first direction, so that the placement module 100 moves back and forth between the first position 210 and the second position 220 once, which can detect more cameras and further improve the detection efficiency.

[0076] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A camera detection device, characterized in that: include: a placement module, wherein a plurality of storage locations for placing cameras are formed on the placement module, and the storage locations are distributed along the second direction; a first driving module, the first driving module being drivingly connected to the placement module and configured to drive the placement module to move along a first direction so as to move the placement module between a first position and a second position; a detection module, the detection module being disposed corresponding to the second position and configured to detect the camera on the placement module located at the second position; A second driving module is drivingly connected to the detection module and is used to drive the detection module to move along a second direction, wherein the first direction and the second direction intersect.

2. A camera detection device according to claim 1, characterized in that: It also includes a vacuum pumping module, the placement module is provided with adsorption holes corresponding to the storage positions, and the vacuum pumping module is connected to the adsorption holes.

3. The camera detection device according to claim 2, characterized in that: The placement module includes an adsorption seat and a base. The adsorption hole is formed on the adsorption seat. A groove is opened on the adsorption seat. The base is detachably arranged in the groove. The first driving module is driven and connected to the base.

4. A camera detection device according to claim 3, characterized in that: The adsorption seat is further formed with an adsorption chamber, the adsorption chamber is connected to the adsorption holes at the plurality of storage positions, and the adsorption chamber is connected to the vacuum module.

5. The camera detection device according to claim 3, characterized in that: The placement module also includes a loading tray, which is provided with a plurality of limit slots, which are used to limit the camera. The limit slots correspond one-to-one to the storage positions, and a connecting hole is formed at the bottom of the limit slots. Each of the limit slots is connected to the adsorption hole at the corresponding storage position through the connecting hole at its bottom.

6. The camera detection device according to claim 5, characterized in that: The adsorption seat is formed with a plurality of protrusions, each of the protrusions is formed with the adsorption hole, and the protrusions are inserted into the communicating holes.

7. The camera detection device according to claim 5, characterized in that: The loading tray forms convex edges on both sides along the first direction, and the convex edges protrude from both sides of the adsorption seat along the first direction. The base forms notches on both sides along the first direction, and the notches communicate with the groove and correspond to the convex edges.

8. The camera detection device according to claim 4, characterized in that: The placement module also includes a slide, the first drive module drives and connects the slide, the base and the first drive module are spaced apart, the base is provided with an air receiving channel, one end of the air receiving channel is connected to the air receiving port of the adsorption chamber, and the other end of the air receiving channel is connected to the vacuum module through a hose, and the hose passes through the gap between the base and the first drive module.

9. The camera detection device according to claim 8, characterized in that: The slide is provided with a sensing sheet, and the first driving module is provided with sensors corresponding to the first position and the second position respectively. The sensors can sense the sensing sheet, and the sensors are electrically connected to the first driving module.

10. The camera detection device according to claim 1, characterized in that: Some of the storage bits are also distributed along the first direction.