Automatic focusing structure of outdoor smart camera

Abstract

The invention relates to the technical field of camera equipment, and discloses an automatic focusing structure of an outdoor intelligent camera, comprising a fuselage, a lens group, and a lens barrel, wherein the fuselage and the lens barrel are fixedly connected, the lens group is coaxially arranged in the lens barrel, a filter module which can rotate relative to the lens barrel is eccentrically arranged at the front end of the lens barrel, the filter module is in a disk shape, and the transmittance of the filter module is affected by both its radial direction and circumferential direction; the automatic focusing structure directly reduces the amount of light entering the lens barrel at a position corresponding to the sky in the picture by a physical method, so that the camera can achieve clear shooting of the picture without manual adjustment, reduce the overexposure of the sky, and avoid underexposure of the ground caused by automatic adjustment of the camera, and by gradually designing the transmittance of the filter in the circumferential direction, it is possible to avoid the problem of overexposure or underexposure of the picture without tedious replacement of filters with different transmittances during shooting.

Description

Technical Field

[0001] The invention relates to the technical field of camera equipment, in particular to an automatic focusing structure of an outdoor intelligent camera. Background Art

[0002] Outdoor cameras are security devices used to monitor outdoor environments and are often used to protect homes, commercial buildings, public places, etc. They are designed to be durable, waterproof, wind-resistant, and shock-resistant to adapt to a variety of adverse weather conditions and environments. First of all, outdoor cameras usually have high-definition video capture capabilities that can capture subtle details and ensure clear images and video records. This is essential for identifying facial features, license plate numbers, or other important details, and is therefore very useful when investigating and resolving potential security issues. Outdoor cameras are usually equipped with infrared night vision capabilities, enabling them to still capture clear images and videos in low light or complete darkness. This means that the monitoring system can remain efficient even at night, providing all-weather security monitoring. Outdoor cameras usually have wide-angle or adjustable focal length lenses that can cover larger areas and provide a wider range of surveillance. This feature is very useful for monitoring large venues or wide areas, minimizing blind spots and improving monitoring efficiency. In addition, modern outdoor cameras are often combined with intelligent analysis functions that can automatically detect and identify abnormal activities, such as motion detection, personnel recognition, etc., so that timely alarms can be issued and corresponding measures can be taken. This intelligent function greatly improves the response speed and accuracy of the monitoring system, enabling it to better deal with various security threats.

[0003] However, existing outdoor cameras usually shoot toward the ground, and in order to expand the shooting range, a bird's-eye view is often used. In order to reduce the overexposure problem caused by direct sunlight, a sunshade is usually installed above the lens. However, in some special occasions, when the lens needs to be directed toward the sky or parallel to the ground and the horizontal plane, the picture will contain both the brighter sky and the relatively darker ground. For example, in aviation monitoring, the camera needs to capture the take-off and landing dynamics of aircraft; in urban security monitoring, the high-rise area is fully monitored; in nature reserves, birds and wild animals are monitored; in large-scale public event monitoring, the scene is captured panoramically; and in building and bridge structure monitoring, the structural integrity is detected. In this case, due to the real-time changes in the brightness of the sky, the automatic exposure system and focusing structure of the existing camera are often difficult to adjust to the ideal brightness level at the same time, which results in that if the focus is set on the ground, the sky part is very easy to be overexposed; conversely, if the focus is set on the sky, the ground may appear too dim. This situation will cause the loss of picture details, thereby affecting the imaging quality and overall monitoring effect of the camera. Summary of the invention

[0004] (I) Technical problems solved: In view of the deficiencies in the prior art, the present invention provides an automatic focusing structure for an outdoor intelligent camera. When the device is shooting the sky and the ground in the same frame, the focusing structure can reduce overexposure and underexposure in the picture, thereby improving the imaging quality. Moreover, the focusing structure can adaptively adjust the picture exposure according to the change in the sky brightness, thus solving the problem that when the existing outdoor intelligent camera is shooting a picture in which the sky and the ground exist at the same time, the picture is easily overexposed or underexposed.

[0005] (II) Technical solution: To achieve the purpose that the focusing structure of the above-mentioned device can reduce overexposure and underexposure in the picture when shooting the same frame of the sky and the ground, thereby improving the imaging quality, and the focusing structure can adaptively adjust the exposure of the picture according to the change of the sky brightness, the present invention provides the following technical solution: an automatic focusing structure of an outdoor intelligent camera, comprising a body, a lens group, and a lens barrel, the body and the lens barrel are fixedly connected, the lens group is coaxially arranged in the lens barrel, and a filter module that can rotate relative to the lens barrel is eccentrically arranged below the front end of the lens barrel, the filter module is in the shape of a disk, and the transmittance of the filter module is affected by both its radial direction and circumferential direction, the transmittance of the filter module gradually decreases along the direction in which the radius of the filter module increases, and the transmittance of the filter module also gradually decreases along the clockwise circumferential direction of the filter module; when the filter module rotates clockwise relative to the lens barrel, the amount of light received by the lens barrel gradually decreases.

[0006] Preferably, the filter module includes a filter, a rotating shaft, a drive motor, a fixed disk, and a control module. The filter and the fixed disk are coaxially rotatably connected, the rotating shaft passes through the fixed disk and is fixedly connected to the filter, the rotating shaft and the fixed disk are rotatably connected, the driving end of the drive motor is connected to the rotating shaft, the drive motor is fixedly mounted on one end of the control module, and the other end of the control module is fixedly mounted on the fixed disk, the input port of the control module is connected to the body, and the fixed disk is also eccentrically provided with a mounting ring connected to the filter, and the front end of the lens barrel is fixedly mounted on the mounting ring.

[0007] Preferably, the diameter of the lens barrel is smaller than the radius of the filter.

[0008] Preferably, the lens group is slidably connected to the lens barrel, and a plurality of groups of power rails are arranged at equal angles along the circumferential direction of the lens barrel. A slider structure matching the power rail is arranged on the lens group, and the slider structure is slidably connected to the power rail, and the power rail drives the slider structure to reciprocate along the axial direction of the lens barrel.

[0009] Preferably, the surface transmittance of the filter is affected by both its radial direction and circumferential direction, and the surface transmittance of the filter gradually decreases in the direction of increasing radius of the filter, and the surface transmittance of the filter also gradually decreases in the clockwise circumferential direction of the filter; when the filter rotates clockwise relative to the lens barrel, the amount of light received by the lens barrel gradually decreases.

[0010] Preferably, the control module is also equipped with an L-shaped mounting frame, one end of the mounting frame is fixedly connected to the control module, and the other end of the mounting frame is fixedly connected to the fuselage, and a mounting plate is provided on the mounting frame.

[0011] Preferably, a dustproof lens is coaxially fixedly mounted on the mounting ring.

[0012] Preferably, the body and the lens barrel are connected via a bayonet.

[0013] Preferably, an exposure monitoring module is provided in the control module, a signal output end of the exposure monitoring module is connected to the drive motor, and the drive motor adjusts the rotation angle according to the output signal of the exposure monitoring module.

[0014] (III) Beneficial effects: Compared with the prior art, the present invention provides an automatic focusing structure for an outdoor intelligent camera, which has the following beneficial effects:

[0015] 1. The automatic focusing structure of the outdoor intelligent camera uses a filter structure in conjunction with a lens barrel structure. Compared with the traditional technical structure, when shooting the sky and the ground in the same picture, the sky part is prone to overexposure, and it is necessary to manually or automatically adjust the camera parameters to reduce the overexposure of the sky. The device directly reduces the amount of light entering the lens barrel at the corresponding position of the sky in the picture through physical methods, and only fine-tunes the amount of light entering the ground position in the picture, so that the camera can achieve clear shooting without manual adjustment, reduce the overexposure of the sky, and avoid the underexposure of the ground caused by the automatic adjustment of the camera, thereby obtaining a more balanced and visually more comfortable picture.

[0016] 2. The automatic focusing structure of the outdoor intelligent camera, through the coordinated use of the filter structure, the lens barrel structure, and the rotating shaft structure, is compared with a single filter used at different times of the day, which will result in a single filter not being able to fully adapt to the brightness of the entire day. During the camera's all-day shooting process, filters with different transmittances need to be frequently replaced. The device designs a gradual change in the transmittance of the disc-shaped filter in the circumferential direction. When the ambient light changes, the overall transmittance of the filter can be changed by simply changing the rotation angle of the filter, so that during the shooting process, there is no need to tediously replace filters with different transmittances to avoid overexposure or underexposure of the picture. This design enables the camera to adapt to the changes in light throughout the day without replacing the filter, and there is no need to manually replace filters with different transmittances, which greatly improves the convenience and efficiency of use, while also lowering the operating threshold and reducing maintenance costs.

[0017] 3. The automatic focusing structure of the outdoor intelligent camera, through the coordinated use of the filter structure, lens barrel structure, rotation axis structure, and control module, compared with the existing structure, the built-in exposure monitoring module of the device can monitor the exposure of the picture in real time, automatically identify overexposure or underexposure problems, and adjust the rotation angle of the filter according to real-time data to optimize the lighting balance of the picture. This intelligent processing method reduces the dependence on manual intervention, improves the accuracy and response speed of exposure adjustment, and can maintain stable shooting effects even under extreme or rapidly changing lighting conditions, and is suitable for use in a variety of external environments.

[0018] 4. The automatic focusing structure of the outdoor intelligent camera uses the lens barrel structure, power rail structure, lens group structure, and slider structure in coordination. Compared with the existing structure, the device drives the entire lens group to move through the power rail. This mechanical movement method is faster and more accurate than traditional electronic or manual focusing. This fast response capability is particularly important for dynamic scenes or rapidly changing external environments. It can ensure that the camera adjusts the focus in time and captures clear images. Compared with the electronic focusing system that requires frequent calibration, the power rail structure based on physical movement is more reliable and simple to maintain. This structure reduces the need for frequent maintenance and reduces the cost of long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of the automatic focusing structure of an outdoor intelligent camera of the present invention;

[0020] Figure 2 It is a schematic diagram of the front side of the three-dimensional structure of the automatic focusing structure of the outdoor intelligent camera of the present invention;

[0021] Figure 3 It is a structural front view of the automatic focusing structure of an outdoor intelligent camera of the present invention;

[0022] Figure 4 It is a structural side view of the automatic focusing structure of an outdoor intelligent camera of the present invention;

[0023] Figure 5 It is a top view of the structure of the automatic focusing structure of an outdoor intelligent camera of the present invention;

[0024] Figure 6 It is a structural AA cross-sectional view of the automatic focusing structure of an outdoor intelligent camera of the present invention;

[0025] Figure 7 A three-dimensional structural cross-sectional view of the automatic focusing structure of an outdoor intelligent camera of the present invention;

[0026] Figure 8 A schematic diagram of the three-dimensional structure of the automatic focusing structure of the outdoor intelligent camera of the present invention with the fuselage removed;

[0027] Fig. 9 It is a three-dimensional structure explosion diagram of the automatic focusing structure of the outdoor intelligent camera of the present invention;

[0028] Fig.10 It is a schematic diagram of the light transmittance variation of the filter structure of the automatic focusing structure of the outdoor intelligent camera of the present invention.

[0029] In the figure: 1-body, 2-lens group, 3-lens barrel, 4-filter, 5-rotation axis, 6-drive motor, 7-fixed plate, 8-control module, 9-mounting ring, 10-power slide rail, 11-slider structure, 12-mounting frame, 13-mounting plug plate, 14-dust-proof lens. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The automatic focusing structure of an outdoor intelligent camera includes a body 1, a lens group 2, and a lens barrel 3. The body 1 and the lens barrel 3 are fixedly connected, and the body 1 and the lens barrel 3 are connected by a bayonet. The bayonet connection method provides a fast and convenient loading and unloading function. This design allows the lens barrel 3 to be easily connected to or removed from the body 1, which is convenient for maintenance, upgrading or replacement of lenses. In addition, the bayonet connection ensures that the lens barrel 3 is firmly fixed to the body 1, which helps to maintain image stability and reduce vibration effects. The lens group 2 is coaxially arranged in the lens barrel 3, and a filter module that can rotate relative to the lens barrel 3 is eccentrically arranged below the front end of the lens barrel 3. The filter module is in the shape of a disk, and the transmittance of the filter module is affected by the radial direction and the circumferential direction. The disk-shaped filter module allows the transmittance to be adjusted by rotation, thereby achieving detailed control of the amount of light. The disc shape enables the module to evenly change the area covered on the light-entering part of the lens barrel 3 when rotating, providing continuous changes in transmittance, which is very important for smoothly adjusting exposure. The transmittance of the filter module gradually decreases along the direction of increasing radius of the filter module, and the transmittance of the filter module also gradually decreases along the clockwise circumferential direction of the filter module; when the filter module rotates clockwise relative to the lens barrel 3, the amount of light received by the lens barrel 3 gradually decreases. This design allows the filter module to accurately control the amount of light received by the lens barrel 3 by simple rotation, thereby effectively adjusting the exposure. This gradual change design of transmittance has both radial and circumferential changes, providing higher flexibility and precision, adjusting exposure under different lighting conditions, and optimizing image quality. By controlling the direction of transmittance reduction, it is possible to better cope with strong light or backlit shooting scenes, reduce overexposure, and ensure the richness and clarity of image details. During the operation of the camera, since the transmittance of the filter 4 gradually decreases along the increasing direction of its radius, when the lens barrel 3 is eccentrically installed above the axis of the filter 4, the amount of light entering the lens barrel 3 gradually decreases from the bottom to the top. In the picture taken by the lens barrel 3, the bottom is the ground and the top is the sky. In this way, the light entering the lens barrel 3 from the sky position will be absorbed by the filter 4 with lower transmittance, thereby reducing the amount of light entering the lens barrel 3 from the sky. The reduction in the amount of light entering avoids overexposure of the sky. The light entering the lens barrel 3 from the ground below will not be significantly affected due to the higher transmittance of the filter 4 at the corresponding position. At this time, the corresponding picture at the ground position is displayed normally. This structure can greatly reduce the overexposure and underexposure of the camera when shooting the sky and the ground in the same picture without changing the parameters of the fuselage 1 and affecting the overall picture, thereby achieving high-quality recording.

[0032] See also Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 The filter module includes a filter 4, a rotating shaft 5, a driving motor 6, a fixed disk 7, and a control module 8. The filter 4 and the fixed disk 7 are coaxially connected, wherein the filter 4 is responsible for adjusting the amount of light entering through the lens. The filter 4 adopts a neutral density filter (ND filter) with a gradually changing transmittance. The rotating shaft 5 allows the filter 4 to rotate to change the transmittance of the lens position. The diameter of the lens barrel 3 is smaller than the radius of the filter 4. The rotating shaft 5 passes through the fixed disk 7 and is fixedly connected with the filter 4. The rotating shaft 5 is rotatably connected with the fixed disk 7. The driving end of the driving motor 6 is connected to the rotating shaft 5. The driving motor 6 drives the rotating shaft 5 to rotate the filter 4 relative to the fixed disk 7. The driving motor 6 is fixedly mounted on one end of the control module 8, and the other end of the control module 8 is fixedly mounted on the fixed disk 7. The input port of the control module 8 is connected to the fuselage 1. The input port of the control module 8 is connected to the fuselage 1 in order to receive data and instructions transmitted from the fuselage 1, such as ambient light conditions, image processing data, etc., so that the control module 8 can adjust the position and transmittance of the filter 4 according to this information to optimize the image quality. The fixed disk 7 is also eccentrically provided with a mounting ring 9 that is connected to the filter 4. The front end of the lens barrel 3 is fixedly mounted on the mounting ring 9. The mounting ring 9 adopts a universal interface. The mounting ring 9 using the universal interface can be adapted to different types of lens barrels 3, which increases the compatibility and practicality of the device. Figure 6 and Fig. 9As shown. A dustproof lens 14 is also coaxially fixedly mounted on the mounting ring 9. The dustproof lens 14 is designed to protect the lens from dust and pollution and ensure that the lens remains clean. Among them, the surface transmittance of the filter 4 is affected by both its radial direction and circumferential direction. The processing of the filter 4 adopts the traditional gradient dimming filter processing technology, wherein the gradient adopts a soft gradient design. The gradient dimming filter is a special filter that can achieve the change of transmittance and the gradual change of transmittance. The main design purpose of this filter is to balance the light intensity of different areas under complex light conditions, so as to obtain a more balanced exposure effect. First, the gradient dimming filter realizes the change of transmittance through its special coating or material. These coatings or materials can absorb or reflect part of the light, thereby reducing the amount of light passing through the filter. By adjusting the coating thickness or material characteristics of the filter, its absorption and reflection ability of light can be controlled, thereby achieving different transmittances. Secondly, the gradient dimming filter can achieve a gradual effect of transmittance. This gradual effect is achieved by the difference in transmittance of different areas on the filter. On one side of the filter, the transmittance may be higher, allowing more light to pass through; on the other side of the filter, the transmittance gradually decreases, allowing only less light to pass through. The surface transmittance of the filter 4 gradually decreases along the direction of increasing radius of the filter 4, and the surface transmittance of the filter 4 gradually decreases along the clockwise circumference of the filter 4; when the filter 4 rotates clockwise relative to the lens barrel 3, the amount of light received by the lens barrel 3 gradually decreases, such as Fig.10 As shown in the direction of the arrow in the middle, the area along the increasing direction of the radius of the filter 4 is the direction in which the transmittance gradually decreases, such as Fig.10 In the figure, the transmittance of area A2 is less than that of area A1, the transmittance of area B2 is less than that of area B1, the transmittance of area C2 is less than that of area C1, the transmittance of area D2 is less than that of area D1, and the transmittance of area E2 is less than that of area E1. The transmittance between the areas along the circumferential direction of the filter 4 gradually decreases, as shown in the figure. Fig.10 In the figure, the light transmittance of the A1 / 2 area is greater than that of the B1 / 2 area, the light transmittance of the B1 / 2 area is greater than that of the C1 / 2 area, the light transmittance of the C1 / 2 area is greater than that of the D1 / 2 area, and the light transmittance of the D1 / 2 area is greater than that of the E1 / 2 area. The position with the maximum light transmittance is completely transparent. Fig.10 The maximum light transmittance area is A1, and the position with the minimum light transmittance is set according to the maximum light intensity in different areas, corresponding to Fig.10. This design allows the filter 4 to more finely control the distribution and intensity of light. By adjusting the rotation angle and position of the filter 4, the amount of light entering the lens from a specific direction can be precisely controlled, thereby effectively managing complex lighting conditions, reducing overexposure or underexposure, and ensuring the uniformity and high quality of the image. This design is particularly useful for dealing with high dynamic range scenes, and can effectively reduce overexposure of the highlight part without sacrificing shadow details. And compared with a single filter 4 used at different times of the day, the filter 4 cannot fully adapt to the illumination of the entire sky, resulting in overexposure or underexposure problems in some shooting times, and the filter 4 with different transmittances needs to be frequently replaced. The device is designed to gradually change the transmittance of the disc-shaped filter 4 in the circumferential direction. When the ambient light changes, the overall transmittance of the filter 4 can be changed by simply changing the rotation angle of the filter 4, because the overall transmittance of the filter 4 gradually decreases along its clockwise circumferential direction. When the ambient light intensity increases, the overall brightness of the captured image increases. At this time, the filter 4 is rotated counterclockwise to reduce the overall transmittance of the filter 4, thereby reducing the light entering the lens barrel 3 and avoiding overexposure of the image; and when the ambient light intensity decreases, the overall brightness of the captured image decreases. At this time, the filter 4 is rotated clockwise to increase the overall transmittance of the filter 4, thereby increasing the light entering the lens barrel 3 and avoiding underexposure of the image. The device can adapt to the ambient light brightness of the image through the built-in exposure monitoring module of the control module 8. The exposure monitoring module adjusts the rotation angle of the filter 4 by monitoring whether there is a problem with the exposure of the captured image of the fuselage 1.

[0033] See also Figure 1 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Fig. 9The control module 8 is also equipped with an L-shaped mounting frame 12, one end of the mounting frame 12 is fixedly connected to the control module 8, and the other end of the mounting frame 12 is fixedly connected to the fuselage 1. The design of the L-shaped mounting frame 12 is mainly to provide a stable support and fixing method to ensure that the control module 8 is firmly installed on the fuselage 1. In this way, the movement or dislocation caused by vibration or other external factors can be reduced, thereby maintaining the accuracy and stability of the equipment. In addition, the L-shaped structure also helps to effectively layout components in a limited space, ensuring that there is no interference between the various components, and is also convenient for maintenance and adjustment. A mounting plug plate 13 is provided on the mounting frame 12, and the equipment is fixed by the mounting plug plate 13. The mounting plug plate 13 provides a fast and reliable fixing method, so that the control module 8 and related equipment can be easily installed or uninstalled when necessary. This design allows rapid equipment replacement or upgrading without large-scale disassembly, thereby improving maintenance efficiency and equipment operability. An exposure monitoring module is provided in the control module 8, and the signal output end of the exposure monitoring module is connected to the drive motor 6, and the drive motor 6 adjusts the rotation angle according to the output signal of the exposure monitoring module. The exposure monitoring module adjusts the rotation angle of the filter 4 by monitoring whether there is any problem with the exposure of the image captured by the body 1. This intelligent processing method reduces the reliance on manual intervention, improves the accuracy and response speed of exposure adjustment, and can maintain a stable shooting effect even under extreme or rapidly changing lighting conditions, making it suitable for use in a variety of external environments.

[0034] See also Figure 1 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , the lens group 2 is slidably connected to the lens barrel 3, and a plurality of groups of power rails 10 are arranged at equal angles along the circumferential direction of the lens barrel 3. A slider structure 11 matching the power rails 10 is arranged on the lens group 2, and the slider structure 11 is slidably connected to the power rails 10, and the power rails 10 drive the slider structure 11 to reciprocate along the axial direction of the lens barrel 3. This structure realizes accurate and smooth focusing of the lens group 2. Through the power rails 10 and the slider structure 11, the lens group 2 can move smoothly along the axial direction of the lens barrel 3, thereby adjusting the focal length or focus point. This mechanical structure allows continuous and precise adjustment, ensuring that clear images can be obtained quickly and accurately under changing shooting conditions.

[0035] Working principle: When existing outdoor cameras shoot the sky and the ground in the same picture, the sky brightness is much higher than the ground brightness, resulting in overexposure of the sky in the shot picture. This requires manual or automatic adjustment of camera parameters to reduce the overexposure of the sky. However, manual real-time adjustment of the camera is costly and inefficient, and relying on automatic adjustment of the camera will cause underexposure of the ground. The device directly reduces the amount of light entering the lens barrel 3 at the corresponding position of the sky in the picture through physical methods, so that the camera can achieve clear shooting without manual adjustment, reducing the overexposure of the sky and avoiding underexposure of the ground caused by automatic adjustment of the camera.

[0036] During the operation of the camera, since the transmittance of the filter 4 gradually decreases along the increasing direction of its radius, when the lens barrel 3 is eccentrically installed above the axis of the filter 4, the amount of light entering the lens barrel 3 gradually decreases from the bottom to the top. In the picture taken by the lens barrel 3, the bottom is the ground and the top is the sky. In this way, the light entering the lens barrel 3 from the sky position will be absorbed by the filter 4 with lower transmittance, thereby reducing the amount of light entering the lens barrel 3 from the sky. The reduction in the amount of light entering avoids overexposure of the sky. The light entering the lens barrel 3 from the ground below will not be significantly affected due to the higher transmittance of the filter 4 at the corresponding position. At this time, the corresponding picture at the ground position is displayed normally. This structure can greatly reduce the overexposure and underexposure of the camera when shooting the sky and the ground in the same picture without changing the parameters of the fuselage 1 and affecting the overall picture, thereby achieving high-quality recording.

[0037] When a single filter 4 is used at different times of the day, the brightness of the sky and the ground will change dynamically during the day, which will result in the single filter 4 not being able to fully adapt to the brightness of the entire day. During the whole-day shooting process of the camera, this single filter 4 will cause the screen to be overexposed or underexposed during some shooting times, and it is necessary to frequently replace filters 4 with different transmittances. However, the device gradually changes the transmittance of the disc-shaped filter 4 in the circumferential direction. When the ambient light changes, the overall transmittance of the filter 4 can be changed by simply changing the rotation angle of the filter 4, so that during the shooting process, there is no need to tediously replace filters 4 with different transmittances to avoid the problem of overexposure or underexposure of the screen.

[0038] When the daylight changes in different time periods, the overall brightness of the sky and the ground will change. At this time, the filter 4 can be driven to rotate by the driving motor 6 to change the amount of light entering the filter 4 as a whole. Since the overall transmittance of the filter 4 gradually decreases along its clockwise circumferential direction. When the ambient light intensity increases, the overall brightness of the captured image increases. At this time, the filter 4 is rotated counterclockwise to reduce the overall transmittance of the filter 4, thereby reducing the light entering the lens barrel 3 and avoiding overexposure of the image; and when the ambient light intensity decreases, the overall brightness of the captured image decreases. At this time, the filter 4 is rotated clockwise to increase the overall transmittance of the filter 4, thereby increasing the light entering the lens barrel 3 and avoiding underexposure of the image. And the built-in exposure monitoring module of the control module 8 can realize the device's adaptive image ambient light brightness. The exposure monitoring module adjusts the rotation angle of the filter 4 by monitoring whether there is a problem with the exposure of the captured image of the fuselage 1.

[0039] When the device needs to automatically adjust the focus, the power slide rail 10 drives the entire lens group 2 to move, thereby realizing automatic focusing of the camera.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic focusing structure for an outdoor intelligent camera, comprising a body (1), a lens group (2), and a lens barrel (3), wherein the body (1) and the lens barrel (3) are fixedly connected, and the lens group (2) is coaxially arranged in the lens barrel (3), characterized in that: A filter module is eccentrically arranged below the front end of the lens barrel (3) and can rotate relative to the lens barrel (3); the filter module is in the shape of a disk, and the transmittance of the filter module is affected by both its radial direction and circumferential direction; the transmittance of the filter module gradually decreases along the direction in which the radius of the filter module increases, and the transmittance of the filter module also gradually decreases along the clockwise circumferential direction of the filter module; when the filter module rotates clockwise relative to the lens barrel (3), the amount of light received by the lens barrel (3) gradually decreases; the filter module comprises a filter (4), a rotating shaft (5), a driving motor (6), a fixed disk (7), and a control module (8); the filter (4) and the fixed disk (7) are coaxially connected for rotation; the rotating shaft (5) passes through the fixed disk (7) and is fixedly connected to the filter (4); the rotating shaft (5) and the fixed disk (7) are connected for rotation. The driving end of the driving motor (6) is connected to the rotating shaft (5), the driving motor (6) is fixedly mounted on one end of the control module (8), the other end of the control module (8) is fixedly mounted on the fixed disk (7), the input port of the control module (8) is connected to the fuselage (1), the fixed disk (7) is also eccentrically provided with a mounting ring (9) connected to the optical filter (4), and the front end of the lens barrel (3) is fixedly mounted on the mounting ring (9); the surface transmittance of the optical filter (4) is affected by both its radial direction and circumferential direction, the surface transmittance of the optical filter (4) gradually decreases along the direction in which the radius of the optical filter (4) increases, and the surface transmittance of the optical filter (4) also gradually decreases along the clockwise circumferential direction of the optical filter (4); when the optical filter (4) rotates clockwise relative to the lens barrel (3), the amount of light received by the lens barrel (3) gradually decreases.

2. The automatic focusing structure of an outdoor intelligent camera according to claim 1, characterized in that: The diameter of the lens barrel (3) is smaller than the radius of the filter (4).

3. The automatic focusing structure of an outdoor intelligent camera according to claim 1, characterized in that: The lens group (2) is slidably connected to the lens barrel (3); a plurality of groups of power slide rails (10) are arranged at equal angles in the lens barrel (3) along its circumferential direction; a slider structure (11) matching the power slide rail (10) is arranged on the lens group (2); the slider structure (11) is slidably connected to the power slide rail (10); and the power slide rail (10) drives the slider structure (11) to reciprocate along the axial direction of the lens barrel (3).

4. The automatic focusing structure of an outdoor intelligent camera according to claim 1, characterized in that: The control module (8) is also equipped with an L-shaped mounting frame (12), one end of the mounting frame (12) is fixedly connected to the control module (8), and the other end of the mounting frame (12) is fixedly connected to the fuselage (1), and a mounting plug plate (13) is provided on the mounting frame (12).

5. The automatic focusing structure of an outdoor intelligent camera according to claim 1, characterized in that: A dustproof lens (14) is also coaxially fixedly mounted on the mounting ring (9).

6. The automatic focusing structure of an outdoor intelligent camera according to claim 1, characterized in that: The body (1) and the lens barrel (3) are connected via a bayonet.

7. The automatic focusing structure of an outdoor intelligent camera according to claim 1, characterized in that: An exposure monitoring module is provided in the control module (8), a signal output end of the exposure monitoring module is connected to the drive motor (6), and the drive motor (6) adjusts the rotation angle according to the output signal of the exposure monitoring module.

Images