Lens module centering equipment and centering method

Abstract

This invention discloses a lens module centering and alignment device and method. The alignment device includes a screw tightening / loosening mechanism, a circuit board position adjustment mechanism, and a lens mount clamping and limiting mechanism. The screw tightening / loosening mechanism includes an up-and-down driving component, an up-and-down moving base, a forward / reverse driving component, and a screw tightening / loosening assembly. The up-and-down moving base is slidably connected to the up-and-down driving component, the forward / reverse driving component is fixed to the up-and-down moving base, and the screw tightening / loosening assembly is rotatably connected to the forward / reverse driving component. The circuit board position adjustment mechanism includes a front-and-back movement adjustment module, a left-and-right movement adjustment module, and a circuit board connection structure. The circuit board connection structure includes a circuit board connecting block located below the screw tightening / loosening assembly. The lens mount clamping plate of the lens mount clamping and limiting mechanism is located below the circuit board connecting block, and the circuit board connecting block has a screw clearance position. This invention achieves automatic centering and alignment between the photosensitive chip and the lens.

Description

Technical Field

[0001] This invention relates to the field of image acquisition equipment technology, and more specifically to a lens module centering and alignment device and method. Background Technology

[0002] Imaging quality of optical systems has always been a crucial issue in the field of optics. The sharpness of the imaging system in image-based products is one of the most critical indicators for cameras, and a key factor in evaluating the quality of a camera product. Multiple factors influence the imaging quality of a camera's lens module, one of which is the offset of the optimal imaging center due to the lens's imaging center being off-center from the image sensor's center. In physical product assembly, the lens's imaging surface is typically circular and larger than the image sensor's typically square surface. It's difficult to align the center of the lens's (circular) imaging surface with the center of the image sensor's (square) surface through image adjustment. This prevents the lens from fully realizing its potential. The adjustment to align the circular and square surfaces is usually completed once the image sensor completely covers the lens, meaning that in most cases, no adjustment is made.

[0003] Therefore, aligning the center of the lens's light-transmitting area with the center of the image sensor's square shape through optical imaging provides guidance for improving the actual assembly process of a camera's image quality.

[0004] In practical applications, especially for screw-constrained threaded focusing lenses (i.e., the lens mount of the lens module and the circuit board with the image sensor are fixed by screws, and the lens is threaded onto the lens mount), the limited adjustment space due to screw constraints usually does not take into account the impact of the lens center and the image sensor center on image quality. Focusing is only completed through the lens thread after the screws are fixed. Although this can improve image quality to some extent, there is still room for improvement. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lens module centering and alignment device and method, which aims to improve the imaging quality of screw-type focusing lenses constrained by screws.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] On one hand, the lens module centering and alignment device includes a screw tightening mechanism, a circuit board position adjustment mechanism, and a lens mount clamping and limiting mechanism; the screw tightening mechanism includes an up-and-down driving power component, an up-and-down moving seat, a forward and reverse driving power component, and a screw tightening assembly. The up-and-down moving seat is slidably connected to the up-and-down driving power component, the forward and reverse driving power component is fixed to the up-and-down moving seat, and the screw tightening assembly is rotatably connected to the forward and reverse driving power component; the circuit board position adjustment mechanism includes a front-and-back moving adjustment module, a left-and-right moving adjustment module, and a circuit board connection structure. The front-and-back moving adjustment module is movably connected to the left-and-right moving adjustment module. The circuit board connection structure is connected to the front and rear movement adjustment module; the lens mount clamping and limiting mechanism includes a transverse clamping power component and a lens mount clamping plate. The lens mount clamping plate has a lens mount conformal limiting cavity and a transverse through hole. The transverse through hole communicates with the lens mount conformal limiting cavity. The output shaft of the transverse clamping power component passes through the transverse through hole. The circuit board connection structure includes a circuit board connecting block. The circuit board connecting block is located below the screw tightening assembly. The lens mount clamping plate is arranged opposite to the circuit board connecting block, and the lens mount clamping plate is located below the circuit board connecting block. The circuit board connecting block has a screw clearance position.

[0008] The further technical solution is as follows: it also includes a circuit board limiting mechanism, wherein the circuit board limiting mechanism includes a limiting plate and the limiting plate is provided with a limiting groove.

[0009] The further technical solution is as follows: the circuit board limiting mechanism further includes an upper and lower spacing adjustment component, an upper and lower guide connecting rod, and a connecting seat. The connecting seat is connected to the front and rear movement adjustment module. The connecting seat is provided with a guide hole. The lower end of the upper and lower guide connecting rod is fixedly connected to the circuit board connecting block. The upper end of the upper and lower guide connecting rod passes through the guide hole. The upper and lower spacing adjustment component passes through the connecting seat and forms a transmission cooperation with the connecting seat. The bottom of the upper and lower spacing adjustment component is fixedly connected to the circuit board connecting block.

[0010] The further technical solution is as follows: the circuit board connection structure includes a lifting structure and an adapter plate, the adapter plate is movably connected to the lifting structure, and the circuit board connection block is fixedly connected to the adapter plate.

[0011] The further technical solution is as follows: the lifting structure includes a lifting power component, a lifting fixed plate and a lifting movable plate. The lifting fixed plate is connected to the front and rear moving adjustment module. The lifting movable plate is slidably connected to the lifting fixed plate. The lifting power component drives the lifting movable plate to move up and down along the lifting fixed plate. The adapter plate is fixed to the lifting movable plate.

[0012] The further technical solution is as follows: the screw tightening assembly includes an upper rotating connector, a lower rotating connector, a rotating rod, and a screwdriver head. The upper rotating connector is connected to the forward and reverse rotation driving power component, the screwdriver head is connected to the lower rotating connector, and the upper rotating connector and the lower rotating connector are connected through the rotating rod.

[0013] The further technical solution is as follows: the left and right movement adjustment module includes a left and right movement driving power component, a left and right movement transmission shaft, a left and right movement slider and a left and right movement mating block. The left and right movement slider and the left and right movement mating block are slidably connected. The left and right movement transmission shaft is connected to the left and right movement driving power component and is drivenly connected to the left and right movement slider.

[0014] The further technical solution is as follows: the forward and backward movement adjustment module includes a forward and backward movement driving power component, a forward and backward movement transmission shaft, a forward and backward movement slider, and a forward and backward movement mating block. The forward and backward movement mating block is fixedly connected to the left and right movement slider, the forward and backward movement slider and the forward and backward movement mating block are slidably connected, the forward and backward movement transmission shaft is connected to the forward and backward movement driving power component, and the forward and backward movement transmission shaft is drivenly connected to the forward and backward movement slider.

[0015] On the other hand, a centering method using the above-mentioned lens module centering device is characterized by comprising:

[0016] Acquire images captured by a lens module, wherein the lens module includes a lens and a photosensitive chip;

[0017] Calculate the sharpness distribution of the acquired images to obtain the offset trend direction of the photosensitive chip relative to the center of the lens;

[0018] The arc-shaped features of the lens's light-transmitting edge are obtained based on the direction of the offset trend;

[0019] The coordinates of the lens's light transmission center are calculated based on its curved shape.

[0020] Move the image sensor so that its center coincides with the light transmission center of the lens.

[0021] The further technical solution is as follows: The calculation of sharpness distribution of the acquired image to obtain the offset trend direction of the photosensitive chip relative to the center of the lens includes:

[0022] The resolution of the acquired images is calculated to obtain the distribution of image resolution.

[0023] The region with the highest image resolution peak was determined based on the distribution.

[0024] The offset trend of the image sensor relative to the center of the lens is determined based on the region with the highest resolution peak.

[0025] The beneficial effects of this invention compared with the prior art are as follows: The lens module centering and alignment device of this invention, through the setting of a screw tightening and loosening mechanism, a circuit board position adjustment mechanism, and a lens mount clamping and limiting mechanism, achieves the fixation of the lens mount. The screw tightening and loosening mechanism can realize the tightening and loosening operation of the screws between the circuit board with the photosensitive chip and the lens mount. After the screw is loosened by the screw tightening and loosening mechanism, the position of the circuit board can be adjusted by the circuit board position adjustment mechanism so that the center of its photosensitive chip coincides with the center of the lens on the lens mount, thereby achieving centering and alignment between the photosensitive chip and the lens. After alignment is completed, the screw can be tightened by the screw tightening and loosening mechanism. In addition, the screw tightening mechanism is equipped with an up-and-down driving power component that can drive the screw tightening assembly to move up and down for vertical position adjustment. In the circuit board position adjustment mechanism, the forward-backward movement adjustment module and the left-right movement adjustment module can adjust the forward-backward and left-right positions of the circuit board. Moreover, the adjustment of the forward-backward and left-right positions of the circuit board is not affected by the vertical position adjustment, but they can be indirectly combined to achieve vertical, left-right, and forward-backward position adjustment. This satisfies the circuit board position adjustment while also meeting the position adjustment requirements of the screw tightening mechanism, thus improving the overall accuracy and convenience of operation.

[0026] The centering method of the lens module centering device of the present invention calculates the sharpness distribution of the acquired image to obtain the offset trend direction of the photosensitive chip relative to the center of the lens; obtains the arcuate feature of the light-transmitting edge of the lens based on the offset trend direction; calculates the coordinates of the light-transmitting center of the lens based on the arcuate feature; and moves the photosensitive chip so that its center coincides with the light-transmitting center of the lens. This achieves automatic tightening and loosening of the screws between the lens and the photosensitive chip, and automatically completes the position adjustment of the circuit board to meet the centering requirements, thereby improving the efficiency and quality of centering.

[0027] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1A schematic diagram of the lens module centering and alignment device provided in a specific embodiment of the present invention. Figure 1 ;

[0030] Figure 2 A schematic diagram of the lens module centering and alignment device provided in a specific embodiment of the present invention. Figure 2 ;

[0031] Figure 3 A schematic diagram of the lens module centering and alignment device provided in a specific embodiment of the present invention. Figure 3 ;

[0032] Figure 4 This is a schematic diagram of the lens mount clamping and limiting mechanism in a lens module centering and alignment device provided in a specific embodiment of the present invention;

[0033] Figure 5 An exploded view of the lens mount clamping and limiting mechanism in the lens module centering and alignment device provided in a specific embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the circuit board position adjustment mechanism in a lens module centering and alignment device provided in a specific embodiment of the present invention;

[0035] Figure 7 An exploded view of the circuit board limiting mechanism in the lens module centering and alignment device provided in a specific embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the screw tightening mechanism in a lens module centering and alignment device provided in a specific embodiment of the present invention;

[0037] Figure 9 An exploded view of the lens mount and lens in the lens module centering and alignment device provided in a specific embodiment of the present invention.

[0038] Figure Labels

[0039] 1. Base; 2. Screw tightening / loosening mechanism; 21. Up-down drive power component; 22. Up-down moving base; 23. Forward / reverse drive power component; 24. Screw tightening / loosening assembly; 241. Upper rotating connector; 242. Rotating rod; 243. Lower rotating connector; 244. Screwdriver head; 3. Circuit board position adjustment mechanism; 31. Forward / backward movement adjustment module; 311. Forward / backward movement drive power component; 312. Forward / backward movement transmission shaft; 313. Forward / backward movement slider; 314. Forward / backward movement mating block; 32. Left / right movement adjustment module; 33. Circuit board connection structure; 331. Lifting structure; 3311. 3312 Lifting movable upright plate; 332 Adapter plate; 333 Circuit board connecting block; 3331 Screw clearance position; 5 Circuit board limiting mechanism; 51 Limiting plate; 511 Limiting groove; 52 Upper and lower spacing adjustment component; 53 Connecting seat; 54 Upper and lower guide connecting rod; 6 Lens mount pressing and limiting mechanism; 61 Lateral pressing power component; 62 Lens mount pressing plate; 621 Lens mount contour limiting cavity; 100 Lens mount; 110 Lens; 200 Screw hole of lens mount; 300 Circuit board; 400 Photosensitive chip; 500 Screw hole of circuit board. Detailed Implementation

[0040] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be understood that, when used in this specification and claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0042] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0043] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] This invention provides a lens module centering and alignment device, primarily designed for screw-constrained threaded focusing lenses. For example... Figure 1-9 As shown, the system includes a screw tightening mechanism 2, a circuit board position adjustment mechanism 3, and a lens mount clamping and limiting mechanism 6. The screw tightening mechanism 2 includes an up-and-down driving power component 21, an up-and-down moving seat 22, a forward and reverse driving power component 23, and a screw tightening assembly 24. The up-and-down moving seat 22 is slidably connected to the up-and-down driving power component 21, the forward and reverse driving power component 23 is fixed to the up-and-down moving seat 22, and the screw tightening assembly 24 is rotatably connected to the forward and reverse driving power component 23. The circuit board position adjustment mechanism 3 includes a front-and-back moving adjustment module 31, a left-and-right moving adjustment module 32, and a circuit board connection structure 33. The front-and-back moving adjustment module 31 is movably connected to the left-and-right moving adjustment module 32, and the circuit board connection structure 33 is connected to the front-and-back moving adjustment module 31. The lens mount clamping and limiting mechanism 6 includes a transverse clamping power member 61 and a lens mount clamping plate 62. The lens mount clamping plate 62 is provided with a lens mount contour limiting cavity 621 and a transverse through hole. The transverse through hole communicates with the lens mount contour limiting cavity 621. The output shaft of the transverse clamping power member 61 passes through the transverse through hole. The circuit board connection structure 33 includes a circuit board connecting block 333. The circuit board connecting block 333 is located below the screw tightening assembly 24. The lens mount clamping plate 62 is arranged opposite to the circuit board connecting block 333, and the lens mount clamping plate 62 is located below the circuit board connecting block 333. The circuit board connecting block 333 is provided with a screw clearance position 3331.

[0045] In this embodiment, the transverse pressing power member 61 is a telescopic cylinder. When the transverse pressing power member 61 is working, it pushes the lens mount 100 with lens 110 laterally, so that it forms a clamping force with the lens mount pressing plate 62 that constrains the lens mount 100, thereby completely limiting the lens mount 100 and then limiting the lens 110.

[0046] The lens module includes a lens 110 and a circuit board 300. The lens 110 is screwed onto the lens mount 100. The circuit board 300 is designed with a photosensitive chip 400. The lens mount 100 is provided with a screw hole 200 for the lens mount, and the photosensitive chip 400 is provided with a screw hole 500 for the circuit board. The screw holes 200 of the lens mount and the screw holes 500 of the circuit board are positioned correspondingly and are locked together by screws.

[0047] In this embodiment, the lens module centering and alignment device also includes a base 1, a screw tightening mechanism 2, a circuit board position adjustment mechanism 3, and a lens mount clamping and limiting mechanism 6 mounted on the base 1. The base 1 is provided with a support seat and a support rod. The support seat is mounted on the top surface of the base 1, and the lower end of the support rod is fixedly connected to the support seat. The up and down driving power component 21 is connected to the support rod through a designed mounting block. The support seat and the support rod serve as the support structure for the screw tightening mechanism 2, so that the screw tightening mechanism 2 is at a certain height distance from the base 1, so as to facilitate the adjustment of the up and down position of the screw tightening component 24 in the screw tightening mechanism 2.

[0048] The purpose of the screw clearance position 3331 is to prevent the screw tightening assembly 24 from interfering with the screw tightening operation of the screw hole 500 on the circuit board and the screw hole 200 on the lens mount. In order to improve the efficiency of tightening and loosening screws, it is preferably designed as a dual-station, that is, the lens module centering device has two screw tightening assemblies 24. The two screw tightening assemblies 24 are independently driven by two forward and reverse drive power components 23, and the two screw tightening assemblies 24 can simultaneously tighten and loosen two screws synchronously.

[0049] In this embodiment, the up-and-down driving power component 21 and the forward-and-reverse driving power component 23 are servo motors. The up-and-down driving power component 21 drives the up-and-down moving seat 22 to move up and down. The up-and-down moving seat 22 synchronously drives the forward-and-reverse driving power component 23 to move up and down. When the forward-and-reverse driving power component 23 is working, it drives the screw tightening and loosening component 24 to rotate, thereby tightening and loosening the screws connecting the lens mount 100 of the lens module to the circuit board. Specifically, after the screw is loosened by the screw tightening and loosening mechanism 2, the position of the circuit board 300 can be adjusted by the circuit board position adjustment mechanism 3 so that the center of the photosensitive chip 400 coincides with the center of the lens 110, thereby achieving centering between the photosensitive chip 400 and the lens 110. After the centering is completed, the screw can be tightened by the screw tightening and loosening mechanism 2. In addition, the screw tightening mechanism 2 is equipped with an up-and-down driving power component 21 that can drive the screw tightening assembly 24 to move up and down for up-and-down position adjustment. In the circuit board position adjustment mechanism 3, the forward-and-backward movement adjustment module 31 and the left-and-right movement adjustment module 32 can adjust the forward-and-backward and left-and-right positions of the circuit board 300. Moreover, the adjustment of the forward-and-backward and left-and-right positions of the circuit board 300 is not affected by the up-and-down position adjustment, but can be indirectly combined to achieve the adjustment of the up-and-down, left-and-right, and forward-and-backward positions. This satisfies the position adjustment of the circuit board 300 while also meeting the position adjustment requirements of the screw tightening mechanism 2, thus improving the overall accuracy and convenience of operation.

[0050] In one embodiment, the support base is an adjustable structure, which can be adjusted in the front-back and left-right directions, thereby further improving the accuracy and range of adjustment.

[0051] In one embodiment, such as Figure 1-3 As shown in Figure 7, the lens module centering and alignment device also includes a circuit board limiting mechanism 5. The circuit board limiting mechanism 5 includes a limiting plate 51 with a limiting groove 511. The circuit board limiting mechanism 5 also includes an upper and lower spacing adjustment component 52, an upper and lower guide connecting rod 54, and a connecting seat 53. The connecting seat 53 is connected to the front and rear movement adjustment module 31 and has a guide hole. The lower end of the upper and lower guide connecting rod 54 is fixedly connected to the circuit board connecting block 333, and the upper end of the upper and lower guide connecting rod 54 passes through the guide hole. The upper and lower spacing adjustment component 52 passes through the connecting seat 53 and forms a transmission cooperation with the connecting seat 53. The bottom of the upper and lower spacing adjustment component 52 is fixedly connected to the circuit board connecting block 333.

[0052] The limiting plate 51 can limit the perimeter of the circuit board 300 to prevent it from moving freely when tightening or loosening screws. The vertical spacing adjustment component 52 can finely adjust the height of the limiting plate 51 so that it can fully limit the circuit board 300. The height of the limiting plate 51 can be adjusted by rotating the vertical spacing adjustment component 52.

[0053] In one embodiment, such as Figure 6 As shown, the circuit board connection structure 33 includes a lifting structure 331 and a transition plate 332. The lifting structure 331 includes a lifting power component, a lifting fixed plate 3312, and a lifting movable plate 3311. The lifting fixed plate 3312 is connected to the front and rear movement adjustment module 31. The lifting movable plate 11 is slidably connected to the lifting fixed plate 3312. The lifting power component drives the lifting movable plate 3311 to move up and down along the lifting fixed plate 3312. The transition plate 332 is fixed to the lifting movable plate 3311. The circuit board connection block 333 is fixedly connected to the transition plate 332.

[0054] In this embodiment, the adapter plate 332 has an L-shaped structure, and the adapter plate 332 is connected and fixed to the circuit board connecting block 333 by screws.

[0055] In this embodiment, the lifting power component is a cylinder. Under the power of the lifting power component, the adapter plate can be driven to move up and down to facilitate the placement of the lens mount 100.

[0056] In one embodiment, such as Figure 2 , 8 As shown, the screw tightening assembly 24 includes an upper rotating connector 241, a lower rotating connector 243, a rotating rod 242, and a screwdriver head 244. The upper rotating connector 241 is connected to the forward and reverse driving power component 23, and the screwdriver head 244 is connected to the lower rotating connector 243. The upper rotating connector 241 and the lower rotating connector 243 are connected by the rotating rod 242.

[0057] The upper rotating connector 241, the lower rotating connector 243, the rotating rod 242, and the screwdriver head 244 are all detachable, which facilitates the replacement of parts, especially the screwdriver head 244, so that different screwdriver heads 244 can be used for different screws.

[0058] In one embodiment, such as Figure 6 As shown, the left-right movement adjustment module 32 includes a left-right movement driving power component, a left-right movement transmission shaft, a left-right movement slider, and a left-right movement mating block. The left-right movement slider and the left-right movement mating block are slidably connected. The left-right movement transmission shaft is connected to the left-right movement driving power component and is drively connected to the left-right movement slider. The front-back movement adjustment module 31 includes a front-back movement driving power component 311, a front-back movement transmission shaft 312, a front-back movement slider 313, and a front-back movement mating block 314. The front-back movement mating block 314 is fixedly connected to the left-right movement slider. The front-back movement slider 313 and the front-back movement mating block 314 are slidably connected. The front-back movement transmission shaft 312 is connected to the front-back movement driving power component 311 and is drively connected to the front-back movement slider 313.

[0059] The left-right movement adjustment module 32 and the front-back movement adjustment module 31 enable the adjustment of the left-right and front-back positions of the circuit board 300.

[0060] This invention also provides a centering method using the aforementioned lens module centering device, primarily for screw-constrained threaded focusing lenses. The method includes the following steps:

[0061] S10. Acquire the image captured by the lens module, which includes a lens and a photosensitive chip;

[0062] Once the lens module is assembled, it can be used to capture images.

[0063] S20. Calculate the sharpness distribution of the acquired image to obtain the offset trend direction of the photosensitive chip relative to the center of the lens.

[0064] Sharpness distribution calculation can determine the trend and direction of the offset, but it cannot pinpoint the specific coordinates of the offset. Sharpness calculation can only provide a basic distribution and cannot quantify it precisely.

[0065] In one embodiment, step S20 specifically includes the following steps:

[0066] S201. Calculate the resolution of the acquired image to obtain the distribution of image resolution.

[0067] Resolution calculation is the calculation of the distribution of sharpness across the entire area of ​​an image. The specific calculation method can be the MTF algorithm.

[0068] S202. Determine the region with the highest image resolution peak based on the distribution.

[0069] The region with the highest resolution peak indicates that the lens center is in this region, but the exact location of the lens center cannot be determined at present. Further processing is needed to determine the exact location.

[0070] S203. Determine the offset trend direction of the photosensitive chip relative to the center of the lens based on the region with the highest resolution peak.

[0071] Since the area where the center of the lens is located has been found, the image closer to the center of the lens is clearer, and thus the direction of the offset trend can be determined.

[0072] S30. Obtain the arc-shaped features of the lens's light-transmitting edge based on the direction of the offset trend.

[0073] A complete circle can be fitted using the arc feature. To ensure fitting accuracy, the arc is usually no less than 1 / 10 of the complete circle.

[0074] S40. Calculate the coordinates of the lens's light transmission center based on its curved shape.

[0075] Image analysis is performed based on the arc contour to fit the arc's geometric features. Then, the center and radius of the arc are deduced from these features. This center is the center of the lens's light-transmitting circle, thus revealing the lens's center coordinates.

[0076] S50, move the image sensor so that its center coincides with the light transmission center of the lens.

[0077] After obtaining the center coordinates of the lens and the center coordinates of the photosensitive chip, the position adjustment mechanism of the circuit board can be controlled to adjust the position of the circuit board so that the center coordinates of the photosensitive chip coincide with the center coordinates of the lens, thereby completing the centering and alignment of the lens module.

[0078] It should be noted that before the control circuit board position adjustment mechanism adjusts the position of the circuit board, the control screw tightening mechanism needs to automatically loosen the screws fixing the lens mount and the circuit board. After the position is adjusted, the control screw tightening mechanism should then automatically tighten the screws fixing the lens mount and the circuit board.

[0079] The above-mentioned centering and adjustment method achieves automatic adjustment, improving the efficiency and quality of centering.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lens module centering and alignment device, applied to screw-constrained threaded focusing lens products, characterized in that, The system includes a screw tightening mechanism, a circuit board position adjustment mechanism, and a lens mount clamping and limiting mechanism. The screw tightening mechanism comprises an up-and-down driving component, an up-and-down moving base, a forward / reverse driving component, and a screw tightening assembly. The up-and-down moving base is slidably connected to the up-and-down driving component, the forward / reverse driving component is fixed to the up-and-down moving base, and the screw tightening assembly is rotatably connected to the forward / reverse driving component. The circuit board position adjustment mechanism includes a front-and-back movement adjustment module, a left-and-right movement adjustment module, and a circuit board connection structure. The front-and-back movement adjustment module is movably connected to the left-and-right movement adjustment module, and the circuit board connection structure... The structure is connected to the front and rear movement adjustment module; the lens mount clamping and limiting mechanism includes a transverse clamping power component and a lens mount clamping plate. The lens mount clamping plate is provided with a lens mount conformal limiting cavity and a transverse through hole. The transverse through hole communicates with the lens mount conformal limiting cavity. The output shaft of the transverse clamping power component passes through the transverse through hole. The circuit board connection structure includes a circuit board connecting block. The circuit board connecting block is located below the screw tightening assembly. The lens mount clamping plate is arranged opposite to the circuit board connecting block, and the lens mount clamping plate is located below the circuit board connecting block. The circuit board connecting block is provided with a screw clearance position.

2. The lens module centering and alignment device according to claim 1, characterized in that, It also includes a circuit board limiting mechanism, which includes a limiting plate and a limiting groove.

3. The lens module centering and alignment device according to claim 2, characterized in that, The circuit board limiting mechanism further includes an upper and lower spacing adjustment component, an upper and lower guide connecting rod, and a connecting seat. The connecting seat is connected to the front and rear movement adjustment module. The connecting seat has a guide hole. The lower end of the upper and lower guide connecting rod is fixedly connected to the circuit board connecting block. The upper end of the upper and lower guide connecting rod passes through the guide hole. The upper and lower spacing adjustment component passes through the connecting seat and forms a transmission cooperation with the connecting seat. The bottom of the upper and lower spacing adjustment component is fixedly connected to the circuit board connecting block.

4. The lens module centering and alignment device according to claim 1, characterized in that, The circuit board connection structure includes a lifting structure and an adapter plate. The adapter plate is movably connected to the lifting structure, and the circuit board connection block is fixedly connected to the adapter plate.

5. The lens module centering and alignment device according to claim 4, characterized in that, The lifting structure includes a lifting power component, a lifting fixed plate, and a lifting movable plate. The lifting fixed plate is connected to the front and rear movement adjustment module, and the lifting movable plate is slidably connected to the lifting fixed plate. The lifting power component drives the lifting movable plate to move up and down along the lifting fixed plate, and the adapter plate is fixed to the lifting movable plate.

6. The lens module centering and alignment device according to claim 1, characterized in that, The screw tightening assembly includes an upper rotating connector, a lower rotating connector, a rotating rod, and a screwdriver head. The upper rotating connector is connected to the forward and reverse rotation driving power component, and the screwdriver head is connected to the lower rotating connector. The upper rotating connector and the lower rotating connector are connected through the rotating rod.

7. The lens module centering and alignment device according to claim 1, characterized in that, The left and right movement adjustment module includes a left and right movement driving power component, a left and right movement transmission shaft, a left and right movement slider, and a left and right movement mating block. The left and right movement slider and the left and right movement mating block are slidably connected. The left and right movement transmission shaft is connected to the left and right movement driving power component and is drivenly connected to the left and right movement slider.

8. The lens module centering and alignment device according to claim 7, characterized in that, The forward and backward movement adjustment module includes a forward and backward movement driving power component, a forward and backward movement transmission shaft, a forward and backward movement slider, and a forward and backward movement mating block. The forward and backward movement mating block is fixedly connected to the left and right movement slider, the forward and backward movement slider and the forward and backward movement mating block are slidably connected, the forward and backward movement transmission shaft is connected to the forward and backward movement driving power component, and the forward and backward movement transmission shaft is drivenly connected to the forward and backward movement slider.

9. A centering method for a lens module using the centering device according to any one of claims 1-8, characterized in that, include: Acquire images captured by a lens module, wherein the lens module includes a lens and a photosensitive chip; Calculate the sharpness distribution of the acquired images to obtain the offset trend direction of the photosensitive chip relative to the center of the lens; The arc-shaped features of the lens's light-transmitting edge are obtained based on the direction of the offset trend; The coordinates of the lens's light transmission center are calculated based on its curved shape. Move the image sensor so that its center coincides with the light transmission center of the lens.

10. The centering method of the lens module centering device according to claim 9, characterized in that, The step of calculating the sharpness distribution of the acquired image to obtain the offset trend direction of the photosensitive chip relative to the center of the lens includes: The resolution of the acquired images is calculated to obtain the distribution of image resolution. The region with the highest image resolution peak was determined based on the distribution. The offset trend of the image sensor relative to the center of the lens is determined based on the region with the highest resolution peak.

Images