A method and mechanism for adjusting the position of the lens optical axis and the image sensor

Abstract

The present invention relates to the technical field of long - focal - length monitoring devices, and particularly to a method and mechanism for adjusting the position of a lens optical axis and an image sensor; it includes a lens body, a sensor bracket, and an image sensor. A connecting ring is provided at the tail end of the lens body, and the connecting ring is connected to an X - axis adjustment module through a dovetail groove guide rail. The other end of the X - axis adjustment module is connected to a Y - axis adjustment module through a dovetail groove guide rail. The other end of the Y - axis adjustment module is fixedly provided with a Z - axis adjustment module. The sensor bracket is installed at the end of the Z - axis adjustment module through a linear guide rail; the image sensor is installed on the sensor bracket. By adopting the present invention, the requirements for lens manufacturing processes can be reduced, and the cost of the lens itself can be reduced. Most importantly, for devices installed in remote mountainous areas, forests, high mountains and other regions, the optical axis can be adjusted simply and conveniently at any time through remote operation, with high efficiency and continuous operation of the device, saving the cost of traveling to the site for maintenance and even saving the cost of disassembling the device and returning it to the factory for adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of long - focal - length monitoring devices, and particularly to a method and mechanism for adjusting the optical axis of a lens and the position of an image sensor. Background Art

[0002] In all walks of life, especially in the monitoring industry, for video terminal devices, especially large - scale pan - tilt heads, dome cameras, PTZ cameras, etc., their monitoring range is wide, monitoring distance is far, and monitoring accuracy requirements are high. Therefore, higher requirements are put forward for the optical axis accuracy of long - focal - length lenses and the position accuracy of image sensors.

[0003] The prior art, CN202011110389.7, relates to an optical lens alignment mechanism. The optical lens alignment mechanism includes a three - dimensional linear alignment structure and a two - axis angle alignment structure; the two - axis angle alignment structure is arranged on the three - dimensional linear alignment structure. The present invention realizes the linear adjustment of the optical lens through the three - dimensional linear alignment structure, and realizes the angle adjustment of the optical lens through the two - axis angle alignment structure, thereby eliminating the need for reverse installation of the optical lens and improving the adjustment efficiency of the optical lens;

[0004] Although the prior art discloses an idea for adjusting an optical lens, the overall structure of this technology is relatively complex and is suitable for the overall adjustment and movement of lenses or view - finding devices. For special scenarios, such as forest prevention, high - mountain, mountainous areas, etc., where the volume is large and it is not easy to disassemble, adjust, and maintain, it cannot provide effective support. Summary of the Invention

[0005] The purpose of the present invention is to propose a method and mechanism for adjusting the optical axis of a lens and the position of an image sensor to solve the above - mentioned technical problems.

[0006] An adjusting mechanism for the optical axis of a lens and the position of an image sensor includes a lens body, a sensor bracket, and an image sensor. A connecting ring is arranged at the tail end of the lens body. The connecting ring is connected to an X - axis adjusting module through a dovetail groove guide rail. The other end of the X - axis adjusting module is connected to a Y - axis adjusting module through a dovetail groove guide rail. A Z - axis adjusting module is fixedly arranged at the other end of the Y - axis adjusting module. The sensor bracket is installed at the end of the Z - axis adjusting module through a linear guide rail; the image sensor is installed on the sensor bracket.

[0007] Stepper motors are arranged in the X - axis adjusting module, Y - axis adjusting module, and Z - axis adjusting module, and gears are arranged at the output ends of the stepper motors for transmission drive; the stepper motors and the image sensor are both connected to an external control signal.

[0008] Further, an X-axis motor bracket is provided on the connecting ring. The X-axis adjustment module includes an X-axis base, an X-axis motor, an X-axis adjustment gear, and a Y-axis motor bracket. The X-axis base is horizontally slidably arranged on the connecting ring through a dovetail groove guide rail. The X-axis motor is installed on the X-axis motor bracket. The X-axis adjustment gear is horizontal and stands on the X-axis base, and meshes with the gear at the output end of the X-axis motor. The Y-axis motor bracket is used to cooperate with the Y-axis adjustment module.

[0009] Further, the Y-axis adjustment module includes a Y-axis base, a Y-axis motor, and a Y-axis adjustment gear. One end of the Y-axis base is longitudinally slidably arranged on the other end of the X-axis base through a dovetail groove guide rail. The Y-axis adjustment gear is vertically arranged on the Y-axis base. The Y-axis motor is fixed on the Y-axis motor bracket, and the gear at the output end of the Y-axis motor meshes with the Y-axis adjustment gear. The other end of the Y-axis base is fixedly connected to the Z-axis adjustment module.

[0010] Further, the Z-axis adjustment module includes a Z-axis base, a Z-axis motor, a Z-axis adjustment ring, and a linear guide rail. The linear guide rail is used to assist in installing the sensor bracket. The Z-axis adjustment ring is rotatably installed at the end of the Z-axis base, and the inner ring wall of the Z-axis adjustment ring is threadedly connected to the sensor bracket. A rack is arranged on the outer ring of the Z-axis adjustment ring. The Z-axis motor is fixed on the side of the Z-axis base, and the gear at the output end of the Z-axis motor meshes with the rack on the outer ring of the Z-axis adjustment ring.

[0011] Further, the sensor bracket is sleeved and installed on the linear guide rail, and a thread matching the Z-axis adjustment ring is arranged on the outer ring of the sensor bracket.

[0012] A method for adjusting the position of the lens optical axis and the image sensor, which is applied to the above-mentioned adjustment mechanism, includes the following steps:

[0013] S1. The external controller obtains and records the offset data of the X, Y, and Z axes of the telephoto lens in real time, and records the image information obtained by the image sensor.

[0014] S2. The external controller compares the image information recorded in S1 with the data of the X, Y, and Z axis motors in the corresponding X, Y, and Z axis adjustment components to confirm the optical axis offset difference and clarity.

[0015] S3. According to the optical axis offset data in S2, the external controller outputs a control signal to drive the X, Y, and Z axis motors; adjust the offset difference through the X and Y axes, and adjust the clarity through the Z axis.

[0016] S31. According to the control signal, first, simultaneously control and drive the X-axis motor and the Y-axis motor. According to the control signal, the X-axis motor outputs the corresponding number of steps to push the X-axis adjustment gear, and the entire X-axis base is adjusted for left and right offset in the X-axis direction; the Y-axis motor outputs the corresponding number of steps to push the Y-axis adjustment gear, and the entire Y-axis base is adjusted for up and down offset in the Y-axis direction.

[0017] S32. After the X and Y axes are adjusted, according to the drive signal, drive the Z-axis motor. The Z-axis motor outputs the corresponding number of steps to rotate the Z-axis adjustment ring. The Z-axis adjustment ring further drives the sensor bracket through the thread with the linear guide as an aid to perform the front and back Z-axis retraction adjustment.

[0018] S4. While the X, Y, and Z-axis motors in S3 are being driven, the image sensor continuously acquires the image frame. After the adjustment is completed, the external controller records the adjustment data of the X, Y, and Z axes and re-identifies the image information. If the specified requirements are not met, the control signal is output again, and the operation of S2 is repeated until the requirements for the image information are met.

[0019] Furthermore, in S1, a steering component is provided outside the telephoto lens for three-dimensional steering control of the overall lens. After the steering adjustment is completed, the operation of optical axis adjustment in S1 is started.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By adopting the present invention, the requirements for the lens manufacturing process can be reduced, and the cost of the lens itself can be reduced. Most importantly, for the equipment installed in remote mountainous areas, forests, high mountains and other regions, the optical axis can be adjusted simply and conveniently at any time through remote operation, with high efficiency, continuous operation of the equipment, saving the cost of traveling to the site for maintenance, and even saving the cost of disassembling the equipment and returning it to the factory for adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an adjustment mechanism for the optical axis of a lens and the position of an image sensor according to the present invention;

[0023] Figure 2 is a schematic side view of an adjustment mechanism for the optical axis of a lens and the position of an image sensor according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Refer to Figures 1 to 2As shown in the figure, an adjustment mechanism for the lens optical axis and the position of the image sensor includes a lens body 100, a sensor bracket 500, and an image sensor 600. A connecting ring 110 is provided at the end of the lens body 100. The connecting ring 110 is connected to an X-axis adjustment module 200 through a dovetail groove guide rail. The other end of the X-axis adjustment module 200 is connected to a Y-axis adjustment module 300 through a dovetail groove guide rail. A Z-axis adjustment module 400 is fixedly provided at the other end of the Y-axis adjustment module 300. The sensor bracket 500 is installed at the end of the Z-axis adjustment module 400 through a linear guide rail 440. The image sensor 600 is installed on the sensor bracket 500.

[0026] Stepper motors are provided in each of the X-axis adjustment module 200, the Y-axis adjustment module 300, and the Z-axis adjustment module 400, and gears are provided at the output ends of the stepper motors for transmission drive. The stepper motors and the image sensor 600 are both connected to an external control signal.

[0027] Further, an X-axis motor bracket 120 is provided on the connecting ring 110. The X-axis adjustment module 200 includes an X-axis base 210, an X-axis motor 220, an X-axis adjustment gear 230, and a Y-axis motor bracket 240. The X-axis base 210 is horizontally slidably provided on the connecting ring 110 through a dovetail groove guide rail. The X-axis motor 220 is installed on the X-axis motor bracket. The X-axis adjustment gear 230 is horizontal and stands on the X-axis base 210 and meshes with the gear at the output end of the X-axis motor 220. The Y-axis motor bracket 240 is used to cooperate with the Y-axis adjustment module 300.

[0028] Further, the Y-axis adjustment module 300 includes a Y-axis base 310, a Y-axis motor 320, and a Y-axis adjustment gear 330. One end of the Y-axis base 310 is longitudinally slidably provided at the other end of the X-axis base 210 through a dovetail groove guide rail. The Y-axis adjustment gear 330 is vertically provided on the Y-axis base 310. The Y-axis motor 320 is fixed on the Y-axis motor bracket 240, and the gear at the output end of the Y-axis motor 320 meshes with the Y-axis adjustment gear 330. The other end of the Y-axis base 310 is fixedly connected to the Z-axis adjustment module 400.

[0029] Further, the Z-axis adjustment module 400 includes a Z-axis base 410, a Z-axis motor 420, a Z-axis adjustment ring 430, and a linear guide rail 440. The linear guide rail 440 is used to assist in installing the sensor bracket 500. The Z-axis adjustment ring 430 is rotatably installed at the end of the Z-axis base 410, and the inner wall of the inner circle of the Z-axis adjustment ring 430 is threadedly connected to the sensor bracket 500. A rack is provided on the outer circle of the Z-axis adjustment ring 430. The Z-axis motor 420 is fixed on the side of the Z-axis base 410, and the gear at the output end of the Z-axis motor 420 meshes with the rack on the outer circle of the Z-axis adjustment ring 430.

[0030] Furthermore, the sensor bracket 500 is sleeved and installed on the linear guide rail 440, and the outer ring of the sensor bracket 500 is provided with threads matching the Z-axis adjustment ring 430;

[0031] In the specific implementation process of this embodiment, the X-axis base 210 and the lens body 100 are connected by a dovetail groove guide rail and can slide left and right. The X-axis motor 220 is fixed on the lens body 100, and the X-axis adjustment gear 230 is fixed on the X-axis base 210. The gear of the X-axis motor 220 and the X-axis adjustment gear 230 are connected by meshing. Driving the X-axis motor 220 to rotate forward or backward drives the gear to rotate forward or backward. The rotation of the gear drives the X-axis adjustment gear 230 to move left or right. The left or right movement of the X-axis adjustment gear 230 drives the X-axis base 210 to move left or right on the lens body 100. The left or right movement of the X-axis base 210 drives the Y-axis base 310 and the Z-axis base 410 to move left or right synchronously. The X-axis motor 220 has a self-locking function when it stops.

[0032] The Y-axis base 310 and the X-axis base 210 are connected by a dovetail groove guide rail and can slide up and down. The Y-axis motor 320 is fixed on the X-axis base 210, and the Y-axis adjustment gear 330 is fixed on the Y-axis base 310. The gear on the rotating shaft of the Y-axis motor 320 and the Y-axis adjustment gear 330 are connected by meshing. Driving the Y-axis motor 320 to rotate forward or backward drives the gear to rotate forward or backward. The rotation of the gear drives the Y-axis adjustment gear 330 to move up or down. The up or down movement of the Y-axis adjustment gear 330 drives the Y-axis base 310 to move up or down on the X-axis base 210. The up or down movement of the Y-axis base 310 drives the Z-axis base 410 to move up or down synchronously. The Y-axis motor 320 has a self-locking function when it stops.

[0033] The Z-axis base 410 is fixed on the Y-axis base 310. The Z-axis motor 420 is fixed on the Z-axis base 410. The sensor bracket 500 and the Z-axis base 410 are connected by a linear guide rail and can slide back and forth. The Z-axis adjustment ring 430 and the sensor bracket 500 are engaged by threads. At the same time, the Z-axis base 410 restricts the Z-axis adjustment ring 430 from moving back and forth and can only rotate around the central axis of the Z-axis base 410 and the sensor bracket 500. The gear of the Z-axis motor 420 and the Z-axis adjustment ring 430 are connected by meshing. The image sensor board 600 is fixed on the sensor bracket 500. Driving the Z-axis motor 420 to rotate forward or backward drives the gear 12 to rotate forward or backward. The rotation of the gear 12 drives the Z-axis adjustment ring 430 to rotate backward or forward. The backward or forward rotation of the Z-axis adjustment ring 430 drives the sensor bracket 500 to move forward or backward. The forward or backward movement of the sensor bracket 500 drives the image sensor board 600 to move forward or backward synchronously. The Z-axis motor 420 has a self-locking function when it stops.

[0034] A method for adjusting the lens optical axis and the position of the image sensor, applied to the above-mentioned adjustment mechanism, comprises the following steps:

[0035] S1, an external controller, which acquires and records the offset data of the telephoto lens in three axes, X, Y and Z, in real time, and records the image information acquired by the image sensor;

[0036] S2, the external controller compares the image information recorded in S1 with the corresponding X, Y and Z three-axis motor data in the X, Y and Z three-axis adjustment components to confirm the optical axis offset difference and clarity;

[0037] S3, according to the optical axis offset data in S2, the external controller outputs a control signal to drive the X, Y and Z axis motors; the offset difference is adjusted by the X and Y axes, and the clarity is adjusted by the Z axis;

[0038] S31, according to the control signal, firstly, the X-axis motor drive and the Y-axis motor are controlled and driven simultaneously, according to the control signal, the X-axis motor outputs a corresponding number of steps, pushes the X-axis adjustment gear, and adjusts the X-axis base as a whole to the left and right in the X-axis direction; the Y-axis motor outputs a corresponding number of steps, pushes the Y-axis adjustment gear, and adjusts the Y-axis base as a whole to the up and down in the Y-axis direction;

[0039] S32, after the adjustment of the X and Y axes is completed, the Z-axis motor is driven according to the driving signal, the Z-axis motor outputs the corresponding number of steps, and the Z-axis adjustment ring is rotated. The Z-axis adjustment ring further drives the sensor bracket through the thread with the aid of the linear guide to adjust the front and rear Z-axis retraction;

[0040] While the X, Y and Z three-axis motors are driven in S4 and S3, the image sensor acquires the image in real time. After the adjustment is completed, the external controller records the X, Y and Z three-axis adjustment data and recognizes the image information again. If it does not meet the specified requirements, it outputs the control signal again and repeats the S2 operation until the image information requirements meet the standards.

[0041] Furthermore, in S1, a steering assembly is provided outside the telephoto lens for performing three-dimensional steering control on the entire lens. When the steering adjustment is completed, the operation of adjusting the optical axis in S1 is started;

[0042] In the implementation process of the present invention, it is applicable to video terminal devices, such as large pan-tilt heads, dome cameras, PTZ cameras, etc. It has a wide monitoring range, a long monitoring distance, and high monitoring accuracy requirements. During the zooming process of the lens inside the device, there is an optical axis deviation. Especially for telephoto lenses or ultra-telephoto lenses, the optical axis deviation is even greater. That is, the center point of the picture at wide angle and the center point of the picture at the minimum angle are not the same scene. There is a deviation in the image source of the center point, or the deviation is relatively large, which will affect the intelligent algorithm. At this time, it is necessary to adjust the optical axis of the lens, that is, adjust the X-axis, Y-axis, and Z-axis. When the X-axis base 210 moves left or right, the X-axis base 210 drives the Y-axis base 310 and the Z-axis base 410 to move left or right synchronously. When the Y-axis base 310 moves up or down, the Y-axis base 310 drives the Z-axis base 410 to move up or down synchronously. So that the center point of the picture at wide angle and the center point of the picture at the minimum angle are the same scene, and there is no deviation in the image source of the center point, thus achieving the adjustment of the optical axis of the lens. During the zooming process, or after the zooming stops, the picture is hazy and unclear, which will also affect the intelligent algorithm. At this time, it is necessary to adjust the position of the image sensor board 600, that is, adjust the Z-axis. When the Z-axis base 410 moves forward or backward, the Z-axis base 410 drives the image sensor board 600 to move forward or backward synchronously, making the picture clear and vivid, thus achieving the adjustment of the position of the image sensor.

[0043] By adopting the present invention, the requirements for lens manufacturing process can be reduced, and the cost of the lens itself can be reduced. Most importantly, for the devices installed in remote mountainous areas, forests, high mountains and other regions, the optical axis can be adjusted simply and conveniently at any time through remote operation, with high efficiency, the device works continuously, saving the cost of traveling to the site for maintenance, and even saving the cost of disassembling the device and returning it to the factory for adjustment.

[0044] The specific embodiments described in this article are only illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the scope defined by the spirit of the present invention.

Claims

1. An adjusting mechanism for the position of the lens optical axis and the image sensor, comprising a lens body (100), a sensor bracket (500) and an image sensor (600). Characterized in that, A connecting ring (110) is provided at the tail end of the lens body (100), the connecting ring (110) is connected with an X-axis adjusting module (200) through a dovetail groove guide rail, the other end of the X-axis adjusting module (200) is connected with a Y-axis adjusting module (300) through a dovetail groove guide rail, a Z-axis adjusting module (400) is fixedly arranged at the other end of the Y-axis adjusting module (300), and the sensor bracket (500) is installed at the end of the Z-axis adjusting module (400) through a linear guide rail (440); the image sensor (600) is installed on the sensor bracket (500). Stepper motors are provided in the X-axis adjusting module (200), Y-axis adjusting module (300) and Z-axis adjusting module (400), and gears are arranged at the output ends of the stepper motors for driving; the stepper motors and the image sensor (600) are both connected with an external control signal. The adjusting method adopted by the adjusting mechanism comprises the following steps: S1. The external controller obtains and records the offset data of the X, Y and Z axes of the telephoto lens in real time, and records the image information obtained by the image sensor. S2. The external controller compares the recognized image information in S1 with the corresponding X, Y and Z axis motor data in the X, Y and Z axis adjustment components to confirm the optical axis offset difference and clarity. S3. According to the optical axis offset data in S2, the external controller outputs a control signal to drive the X, Y and Z axis motors; the offset difference is adjusted through the X and Y axes, and the clarity is adjusted through the Z axis. S31. According to the control signal, first perform the simultaneous control drive of the X-axis motor and the Y-axis motor. According to the control signal, the X-axis motor outputs the corresponding number of steps to push the X-axis adjustment gear, and the overall X-axis base is adjusted left and right in the X-axis direction; the Y-axis motor outputs the corresponding number of steps to push the Y-axis adjustment gear, and the overall Y-axis base is adjusted up and down in the Y-axis direction. S32. After the X and Y axis adjustments are completed, according to the drive signal, perform the Z-axis motor drive. The Z-axis motor outputs the corresponding number of steps to rotate the Z-axis adjustment ring, and the Z-axis adjustment ring further drives the sensor bracket through the thread with the linear guide rail as an aid to perform the front and back Z-axis indentation adjustment. S4. While the X, Y and Z axis motors in S3 are being driven, the image sensor obtains the image screen in real time. After the adjustment is completed, the external controller records the X, Y and Z axis adjustment data, and recognizes the image information again. If the image information does not meet the standard, output the control signal again and repeat the operation of S2 until the image information requirement is met.

2. An adjusting mechanism for the position of the lens optical axis and the image sensor according to claim 1, Characterized in that, An X-axis motor bracket (120) is provided on the connecting ring (110). The X-axis adjustment module (200) includes an X-axis base (210), an X-axis motor (220), an X-axis adjustment gear (230), and a Y-axis motor bracket (240). The X-axis base (210) is horizontally slidably arranged on the connecting ring (110) through a dovetail groove guide rail. The X-axis motor (220) is installed on the X-axis motor bracket. The X-axis adjustment gear (230) is horizontal and stands on the X-axis base (210), and meshes with the gear at the output end of the X-axis motor (220). The Y-axis motor bracket (240) is used to cooperate with the Y-axis adjustment module (300).

3. An adjustment mechanism for the position of the lens optical axis and the image sensor according to claim 2, characterized in that, the Y-axis adjustment module (300) includes a Y-axis base (310), a Y-axis motor (320), and a Y-axis adjustment gear (330). One end of the Y-axis base (310) is longitudinally slidably arranged on the other end of the X-axis base (210) through a dovetail groove guide rail. The Y-axis adjustment gear (330) is vertically arranged on the Y-axis base (310). The Y-axis motor (320) is fixed on the Y-axis motor bracket (240), and the gear at the output end of the Y-axis motor (320) meshes with the Y-axis adjustment gear (330). The other end of the Y-axis base (310) is fixedly connected to the Z-axis adjustment module (400).

4. An adjustment mechanism for the position of the lens optical axis and the image sensor according to claim 3, characterized in that, the Z-axis adjustment module (400) includes a Z-axis base (410), a Z-axis motor (420), a Z-axis adjustment ring (430), and a linear guide rail (440). The linear guide rail (440) is used to assist in installing the sensor bracket (500). The Z-axis adjustment ring (430) is rotatably installed at the end of the Z-axis base (410), and the inner wall of the inner circle of the Z-axis adjustment ring (430) is threadedly connected to the sensor bracket (500). A rack is arranged on the outer circle of the Z-axis adjustment ring (430). The Z-axis motor (420) is fixed on the side of the Z-axis base (410), and the gear at the output end of the Z-axis motor (420) meshes with the rack on the outer circle of the Z-axis adjustment ring (430).

5. An adjustment mechanism for the position of the lens optical axis and the image sensor according to claim 4, characterized in that, the sensor bracket (500) is sleeved and installed on the linear guide rail (440), and a thread matching the Z-axis adjustment ring (430) is arranged on the outer circle of the sensor bracket (500).

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