Automatic focusing equipment

Abstract

The present invention discloses an automatic focusing device, and relates to the technical field of lens module production and detection. The present invention comprises a first lifting device and a focusing cantilever fixed thereon, the focusing cantilever comprises a cantilever load-bearing member, a plurality of reset jaws, a rotating support mechanism and a pull-shaft lifting mechanism, the rotating support mechanism is arranged at the bottom of the cantilever load-bearing member, the pull-shaft lifting mechanism is fixed at the top of the cantilever load-bearing member, one end of the pull-shaft lifting mechanism passes through the cantilever load-bearing member and the rotating support mechanism in sequence and is provided with a rotating body; a plurality of reset jaws are connected to the rotating support mechanism in a manner symmetrical with respect to the center of the axis of the rotating body, so that the rotating support mechanism drives a plurality of reset jaws to rotate around the axis of the rotating body; a plurality of reset jaws all have a top support portion crimped with the rotating body, so that a plurality of reset jaws open and close with the lifting and lowering of the pull-shaft lifting mechanism. The reset jaws of the present invention have high synchronization and small parallelism error, which provide effective guarantee for focusing accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of lens module production testing, in particular to automatic focusing equipment. Background Art

[0002] Security cameras are an important part of security systems. Existing security cameras generally use lens modules composed of fixed focal length lenses and imaging circuit boards. During the production and assembly process of the lens module, the lens module needs to be focused first, that is, the distance between the lens and the photosensitive element of the lens module is finely adjusted using the focusing device, so that the focusing surface of the lens is aligned with the sensing surface of the photosensitive element to achieve the best imaging quality.

[0003] The working modes of the focusing production line are generally divided into two types: manual focusing and mechanical automatic focusing. Manual focusing requires the operator to hold the lens and align it with the focusing plate, and complete the focusing work by visual observation and repeated twisting and fine-tuning the lens. Manual focusing is time-consuming and labor-intensive, and the difference rate of finished products is large, which seriously affects the imaging quality of the lens in subsequent use. Mechanical automatic focusing requires the use of an automatic focusing device. The existing automatic focusing device uses a combination of springs, linear bearings, four sets of small single-acting cylinders, and contoured clamps, synchronous belt transmission mechanisms, stepper motors, deep groove ball bearings, etc. to achieve the clamping, loosening and rotation focusing of the lens. However, due to the use of four sets of small single-acting cylinders, it will be impossible to control the four sets of small single-acting cylinders to move at the same time, causing the lens module to be clamped off, affecting the focusing accuracy. In addition, the deep groove ball bearing fixed rotating clamping device cannot ensure the parallelism of the contoured clamp due to the bearing clearance, thereby affecting the focusing accuracy. Summary of the invention

[0004] The purpose of the invention is to provide an automatic focusing device to solve the problems of low manual focusing efficiency and low yield rate, poor jaw synchronization and large parallelism error of existing automatic focusing devices, which lead to low focusing accuracy of lens modules. The automatic focusing device of the present invention shortens the single focusing operation time to less than 15 seconds, has a small jaw parallelism error, and greatly improves the jaw synchronization, thus providing a guarantee for the accuracy requirements of automatic focusing.

[0005] The technical solution adopted by the present invention is as follows: an automatic focusing device, including a first lifting device and a focusing cantilever fixed thereon, the focusing cantilever including a cantilever load-bearing member, a plurality of reset jaws, a rotating support mechanism and a pulling shaft lifting mechanism, the rotating support mechanism is arranged at the bottom of the cantilever load-bearing member, the pulling shaft lifting mechanism is fixed at the top of the cantilever load-bearing member, one end of the pulling shaft lifting mechanism passes through the cantilever load-bearing member and the rotating support mechanism in sequence and is provided with a rotating body; a plurality of reset jaws are connected to the rotating support mechanism in a manner symmetrical with respect to the center axis of the rotating body, so that the rotating support mechanism drives the plurality of reset jaws to rotate around the axis of the rotating body; the plurality of reset jaws all have a top support portion crimped with the rotating body, so that the plurality of reset jaws open and close with the lifting and lowering of the pulling shaft lifting mechanism.

[0006] Due to the above arrangement, the reset jaws connected to the rotating support mechanism are passively opened and actively clamped during the lifting and lowering of the rotating body, and the opening and closing of the reset jaws are controlled by a single factor, with high synchronization. Secondly, since the reset jaws are relatively fixed on the rotating support mechanism, their translational movement is not affected by the gap or error of parts such as bearings, which provides effective guarantee for improving the parallelism of the jaws.

[0007] Furthermore, the supporting portion has a supporting surface pressed against the rotating body, the supporting surface is a plane or an arc surface, and a distance difference is set between the vertical distances from any two points on the axis of the rotating body to the supporting surface.

[0008] Due to the above arrangement, the vertical distances from any two points on the axis of the rotating body to the top support surface are different. Therefore, during the lifting and lowering process of the rotating body, the vertical distance from any point on the axis of the rotating body to the top support portion tends to gradually increase or decrease, providing a guarantee for the smooth opening and closing of the resetting jaws.

[0009] Furthermore, the rotating body is a cone, and a universal ball is movably embedded in the top supporting surface of the top supporting part, and the universal ball is press-connected with the rotating body.

[0010] Due to the above arrangement, the rotating body is a cone, and the top support surface is a plane in line contact with the cone or an arc surface in surface contact, which can make the top support part contact with the rotating body smoother. Under the premise of the rotating body rising and falling at a uniform speed, the opening and closing speed of the reset clamping jaw shows a linear change trend, which is more controllable. Furthermore, a universal ball is movably embedded in the top support surface, so that the rotating body is always in pressure contact with the universal ball, and the sliding fit is changed into a rolling fit, which reduces the wear of the rotating body and the top support part, and ensures the moving accuracy of the reset clamping jaw.

[0011] Furthermore, the pull shaft lifting mechanism includes a pull shaft and a second lifting device, the second lifting device is fixed on the top of the cantilever load-bearing member, one end of the pull shaft is fixedly connected to the second lifting device, and the other end of the pull shaft passes through the cantilever load-bearing member and the rotating support mechanism in sequence and is provided with a rotating body, and the moving direction of the rotating body is the same as the extending direction of its axis. The moving direction of the rotating body is the same as the extending direction of its axis, so at the same time, the top support part of each reset clamp is at the same crimping position with the rotating body, and the distance of translation of each reset clamp due to the compression of the rotating body is also the same, and each reset clamp always maintains a symmetrical state relative to the center of the rotating body axis, and maintains a high degree of synchronization during the opening and closing process.

[0012] Furthermore, the second lifting device includes a slide cylinder and a pull plate assembly, the slide cylinder is fixed on the top of the cantilever load-bearing member, and the pull plate assembly is arranged between the slide cylinder and the pull shaft to drive the pull shaft to reciprocate along the extension direction of the axis of the rotating body. The slide cylinder has high mechanical positioning accuracy and high repeatability, is easy to control, and can provide guarantee for the accuracy of automatic focusing.

[0013] Furthermore, the reset jaw includes a contoured jaw and a plurality of spring telescopic shafts, which are fixed parallel to each other between the reset jaw and the rotating support mechanism so that the reset jaw reciprocates in the radial direction of the rotating body; the contoured jaw has a clamping portion and a supporting portion on one side adjacent to the rotating body, the supporting portion is wedge-shaped, and the supporting surface of the supporting portion corresponding to the rotating body is an inclined surface.

[0014] Due to the above arrangement, the contoured clamping jaws are fixed to the clamping jaw fixing plate through the spring telescopic shafts. The mutually parallel spring telescopic shafts are compressed and actively stretched so that the contoured clamping jaws can reciprocate along the axial direction of the rotating body, and each contoured clamping jaw has high parallelism.

[0015] Furthermore, the rotating support mechanism includes a second pulley transmission assembly, a rotating fixed plate and a plurality of clamping claw fixing plates. The second pulley transmission assembly is movably connected to the bottom of the cantilever load-bearing member through a bearing, the top of the rotating fixed plate is fixedly connected to the second pulley transmission assembly, the plurality of clamping claw fixing plates are fixed to the bottom of the rotating fixed plate in a centrally symmetrical manner, and the plurality of reset clamps are respectively fixed to the corresponding clamping claw fixing plates.

[0016] Due to the above arrangement, the rotational movement and translational movement of the reset clamping claw are respectively controlled and adjusted by the second pulley transmission assembly and the second lifting device without interfering with each other, which is convenient for programmed control and automated operation.

[0017] Furthermore, the first lifting device includes a fixed base, a first pulley transmission assembly, a ball screw assembly and a linear guide. The first pulley transmission assembly is arranged at the top or bottom of the fixed base, the linear guide cooperates with the ball screw assembly and is vertically fixed on the fixed base, and the two ends of the ball screw assembly are vertically fixed to the fixed base through bearings. One end of the ball screw assembly passes through the fixed base and is fixedly connected to the first pulley transmission assembly. The cantilever load-bearing member is fixedly connected to the ball screw assembly and slidably cooperates with the linear guide, so that the cantilever load-bearing member is driven by the ball screw assembly to reciprocate and lift along the linear guide.

[0018] Due to the above arrangement, under the control of the first pulley transmission assembly, the focusing cantilever moves up and down along the linear guide rail as the ball screw assembly moves, and has high mechanical strength and positioning accuracy, and is convenient for programming control and automated operation.

[0019] Furthermore, a sensor is provided at the bottom of the cantilever load-bearing member, and the sensor is aligned with a plurality of reset jaws.

[0020] Due to the above arrangement, the sensor provided at the bottom of the cantilever load-bearing member is used to detect the distance between the reset clamp and the lens module. When the first lifting device drives the focusing cantilever to descend and the reset clamp moves to the first predetermined distance above the lens module, the control system can control the second lifting device to drive the rotating body to ascend and descend according to the signal fed back by the sensor, so that the reset clamp is in an open state; when the first lifting device further drives the focusing cantilever to descend and the reset clamp moves to the second predetermined distance from the lens module, the control system can control the second lifting device to drive the rotating body to ascend and descend according to the signal fed back by the sensor, so that the reset clamp is in a clamped state. The above arrangement facilitates programming control and automated operation, and effectively reduces the influence of manual operation on focusing accuracy.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. Due to the above arrangement, the reset jaws connected to the rotating support mechanism are passively opened and actively clamped during the lifting and lowering of the rotating body. The opening and closing of the reset jaws are controlled by a single factor and have high synchronization. Secondly, since the reset jaws are relatively fixed on the rotating support mechanism, their translational movement is not affected by the gap or error of parts such as bearings, which provides effective guarantee for improving the parallelism of the jaws;

[0023] 2. The vertical distances from any two points on the axis of the rotating body to the top support surface are different. Therefore, during the lifting and lowering process of the rotating body, the vertical distance from any point on the axis of the rotating body to the top support part gradually increases or decreases, which provides a guarantee for the smooth opening and closing of the reset jaws;

[0024] 3. The rotating body is a cone, and the top support surface is a plane in line contact with the cone or an arc surface in surface contact, which can make the top support part and the rotating body contact more smoothly. Under the premise of the rotating body rising and falling at a uniform speed, the opening and closing speed of the reset clamping claw will show a linear change trend, which is more controllable. Furthermore, a universal ball is movably embedded in the top support surface, so that the rotating body is always in pressure contact with the universal ball, changing the sliding fit into a rolling fit, reducing the wear of the rotating body and the top support part, and ensuring the moving accuracy of the reset clamping claw;

[0025] 4. The movement direction of the rotating body is the same as the extension direction of its axis. Therefore, at the same time, the top support part of each reset clamp is in the same position as the rotating body, and the distance of translation of each reset clamp due to the compression of the rotating body is also the same. Each reset clamp always maintains a symmetrical state relative to the center of the rotating body axis and maintains a high degree of synchronization during the opening and closing process;

[0026] 5. The profiling jaws are fixed on the jaw fixing plate through spring telescopic shafts. The parallel spring telescopic shafts are compressed and actively stretched to enable the profiling jaws to perform axial reciprocating motion of the rotating body, and the parallelism of each profiling jaw is high;

[0027] 6. The rotational motion and translational motion of the reset clamp are controlled and adjusted by the second pulley transmission assembly and the second lifting device respectively, without interfering with each other and with high motion accuracy, which is convenient for programming control and automatic operation;

[0028] 7. The focusing cantilever is lifted and lowered with the cooperation of the first pulley transmission assembly, the ball screw assembly and the linear guide rail, with high mechanical strength and positioning accuracy, and is convenient for programming control and automated operation;

[0029] 8. The sensor installed at the bottom of the cantilever load-bearing member is used to detect the distance between the reset clamp and the lens module, providing guarantee for the automated operation of the automatic focusing equipment, facilitating programming control, and effectively reducing the impact of manual operation on focusing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the automatic focusing device of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the focusing cantilever of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the focus cantilever of the present invention in a clamped state of the reset clamping claw;

[0033] Figure 4 It is a structural schematic diagram of the focus cantilever of the present invention in an open state of the reset clamping claw;

[0034] Markings in the figure: 100-first lifting device; 200-cantilever load-bearing member; 300-reset clamp; 400-rotation support mechanism; 500-pull shaft lifting mechanism; 600-sensor; 700-lens module; 800-fixed tooling; 110-fixed base; 120-first pulley transmission assembly; 121-driven pulley A; 122-driving pulley A; 123-transmission belt A; 124-driving motor A; 130-ball screw assembly; 140-linear Guide rail; 310-contact clamp; 320-support part; 330-clamping part; 340-spring telescopic shaft; 350-universal ball; 410-second pulley transmission assembly; 411-driven pulley B; 412-driving pulley B; 413-transmission belt B; 414-driving motor B; 420-rotating fixed plate; 430-clamping clamp fixing plate; 510-rotating body; 520-pulling shaft; 530-second lifting device; 531-sliding cylinder; 532-pulling plate assembly. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Example 1

[0037] The automatic focusing device according to the embodiment of the present disclosure includes a first lifting device 100 and a focusing cantilever fixed thereon, and the first lifting device 100 drives the focusing cantilever to move up and down.

[0038] like Figure 1 and Figure 2As shown, the focusing cantilever includes a cantilever load-bearing member 200, a plurality of reset clamps 300, a rotation support mechanism 400 and a pull-shaft lifting mechanism 500. The cantilever load-bearing member 200 is a plate-like structure, and the rotation support mechanism 400 is arranged at the bottom of the cantilever load-bearing member 200. The rotation support mechanism 400 includes a second pulley transmission assembly 410, a rotation fixing plate 420 and a plurality of clamp fixing plates 430. Among them, the second pulley transmission assembly 410 includes a driven pulley B411, a driving pulley B412, a transmission belt B413 and a driving motor B414. Two rotating connection holes are provided on the cantilever load-bearing member 200, so that the driven pulley B411 and the driving pulley B412 are movably connected to the bottom of the cantilever load-bearing member 200 through bearings, and the transmission belt B413 is sleeved on the driven pulley B411 and the driving pulley B412, and the driving motor B414 for driving the driving pulley B412 to rotate is fixed to the top or bottom of the cantilever load-bearing member 200. The top of the rotating fixed plate 420 is bolted to the bottom of the driven pulley B411. A plurality of clamping jaws 430 are fixed to the bottom of the rotating fixed plate 420 in a centrally symmetrical manner, and a plurality of reset clamping jaws 300 are respectively fixed to the corresponding clamping jaws 300.

[0039] The pulling shaft lifting mechanism 500 includes a pulling shaft 520 and a second lifting device 530. The second lifting device 530 is fixed on the top of the cantilever load-bearing member 200. One end of the pulling shaft 520 is fixedly connected to the second lifting device 530. The other end of the pulling shaft 520 sequentially passes through the rotating connection hole, the driven pulley B411 and the rotating support plate of the cantilever load-bearing member 200 and is provided with a rotating body 510. The pulling shaft 520 is movably connected to the driven pulley B411 and the rotating support plate through a linear bearing. The second lifting device 530 drives the rotating body 510 to rise and fall along the extension direction of its own axis through the pulling shaft 520.

[0040] The plurality of reset jaws 300 are symmetrical with respect to the axis of the rotating body 510, and the rotating support mechanism 400 drives the plurality of reset jaws 300 to rotate around the axis of the rotating body 510. The reset jaw 300 includes a contoured jaw 310 and a plurality of spring telescopic shafts 340, preferably, the number of the spring telescopic shafts 340 is two. The two spring telescopic shafts 340 are fixed between the reset jaw 300 and the rotating support mechanism 400 in parallel with each other, and the axes of the two spring telescopic shafts 340 are perpendicular to the axis of the rotating body 510, so that the reset jaw 300 reciprocates along the radial direction of the rotating body 510. Preferably, one end of the spring telescopic shaft 340 is threadedly connected to the reset jaw 300, and the other end is fixed to the jaw fixing plate 430 through a linear bearing. The contoured jaw 310 has a clamping portion 330 and a supporting portion 320 on one side adjacent to the rotating body 510. The clamping portion 330 is located below the top support portion 320, and the clamping portion 330 has an arc that matches the lens module 700. The top support surface of the top support portion 320 in contact with the rotating body 510 is a plane or an arc surface, and a distance difference is set between the vertical distances from any two points on the axis of the rotating body 510 to the top support surface, that is, during the lifting and lowering process of the rotating body 510, the vertical distance between any point on the axis of the rotating body 510 and the top support surface tends to gradually increase or decrease. Preferably, a universal ball 350 is movably embedded in the top support surface, and the universal ball 350 is pressed against the rotating body 510.

[0041] In this embodiment, the rotating body 510 is cone-shaped and has a reduced diameter end and an expanded diameter end. The reduced diameter end of the rotating body 510 is close to the cantilever load-bearing plate. The top support portion 320 of the reset clamp 300 is wedge-shaped. The top support surface of the top support portion 320 corresponding to the rotating body 510 is an inclined surface. The inclined surface is inclined toward the conical surface of the cone. The universal ball 350 is movably embedded in the inclined surface. The pressing point between the reset clamp 300 and the rotating body 510 is always located on the universal ball 350. In this embodiment, if Figure 3 The pull shaft 520 drives the rotating body 510 to lower so that the plurality of reset jaws 300 are in a clamped state; Figure 4 As shown, the pull shaft 520 drives the rotating body 510 to rise, so that the plurality of reset jaws 300 are in an open state.

[0042] In this embodiment, the second lifting device 530 further includes a sliding cylinder 531 and a pulling plate assembly 532. The sliding cylinder 531 is fixed on the top of the cantilever load-bearing member 200, and the pulling plate assembly 532 is arranged between the sliding cylinder 531 and the pulling shaft 520 to drive the pulling shaft 520 to reciprocate along the extension direction of the axis of the rotating body 510.

[0043] In this embodiment, the first lifting device 100 further includes a fixed base 110, a first pulley transmission assembly 120, a ball screw assembly 130 and a linear guide 140. The first pulley transmission assembly 120 is arranged at the top or bottom of the fixed base 110. The first pulley transmission assembly 120 includes a driven pulley A121, a driving pulley A122, a transmission belt A123 and a driving motor A124. The fixed base 110 is in an I-shape, and two transmission connection holes are provided on the top thereof, so that the driven pulley A121 and the driving pulley A122 are movably connected to the top of the fixed base 110 through bearings, and the driving motor A124 that drives the driving pulley A122 to rotate is fixedly connected to the fixed base 110. The linear guide 140 cooperates with the ball screw assembly 130 and is vertically fixed to the side of the fixed base 110. The upper and lower ends of the ball screw assembly 130 are fixed on the fixed base 110 through bearings, and one end of the ball screw assembly 130 passes through the fixed base 110 and is fixedly connected to the driven pulley A121 through the transmission connection hole. One end of the cantilever load-bearing member 200 is fixedly connected to the ball screw assembly 130 and slidably cooperates with the linear guide 140, so that the cantilever load-bearing member 200 is driven by the ball screw assembly 130 to reciprocate and rise and fall along the linear guide 140.

[0044] In this embodiment, a sensor 600 is further provided at the bottom of the cantilever load-bearing member 200 , and the sensor 600 is aligned with a plurality of reset jaws 300 .

[0045] The working principle of this embodiment is as follows: the lens module 700 is clamped in the fixed fixture 800, the axis of the lens module 700 coincides with the axis of the rotating body 510, and a plurality of reset claws 300 are aligned with the lens module 700. The first lifting device 100 drives the focusing cantilever to descend, and when the sensor 600 detects that it is at a first predetermined distance from the lens module 700, such as when a plurality of reset claws 300 are located 6-10 mm above the lens module 700, the sensor 600 feeds back a signal to the control system of the automatic focusing device, and the control system controls the first lifting device 100 to stop descending, and the second lifting device 530 drives the rotating body 510 to move through the pull shaft 520, so that the plurality of reset claws 300 are in an open state; after the reset claws 300 are in an open state, the control system controls the first lifting device 100 to continue to descend, and when the sensor 600 detects that When it is at a second predetermined distance from the lens module 700, such as when the lens module 700 is located in the middle of the clamping part 330 of the plurality of reset jaws 300, the sensor 600 feeds back a signal to the control system of the automatic focusing device, and the control system controls the first lifting device 100 to stop descending, and the second lifting device 530 drives the rotating body 510 to move in the opposite direction through the pull shaft 520, so that the plurality of reset jaws 300 are in a clamped state. After the plurality of reset jaws 300 clamp the lens module 700, the control system controls the second pulley transmission mechanism to drive the plurality of reset jaws 300 to rotate, thereby completing the automatic focusing operation of the lens module 700.

[0046] Example 2

[0047] According to another embodiment of the present disclosure, an automatic focusing device includes a first lifting device 100 and a focusing cantilever fixed thereon, and the first lifting device 100 drives the focusing cantilever to move up and down.

[0048] like Figure 1 and Figure 2 As shown, the focusing cantilever includes a cantilever load-bearing member 200, a plurality of reset clamps 300, a rotation support mechanism 400 and a pull-shaft lifting mechanism 500. The cantilever load-bearing member 200 is a plate-like structure, and the rotation support mechanism 400 is arranged at the bottom of the cantilever load-bearing member 200. The rotation support mechanism 400 includes a second pulley transmission assembly 410, a rotation fixing plate 420 and a plurality of clamp fixing plates 430. Among them, the second pulley transmission assembly 410 includes a driven pulley B411, a driving pulley B412, a transmission belt B413 and a driving motor B414. Two rotating connection holes are provided on the cantilever load-bearing member 200, so that the driven pulley B411 and the driving pulley B412 are movably connected to the bottom of the cantilever load-bearing member 200 through bearings, and the transmission belt B413 is sleeved on the driven pulley B411 and the driving pulley B412, and the driving motor B414 for driving the driving pulley B412 to rotate is fixed to the top or bottom of the cantilever load-bearing member 200. The top of the rotating fixed plate 420 is bolted to the bottom of the driven pulley B411. A plurality of clamping jaws 430 are fixed to the bottom of the rotating fixed plate 420 in a centrally symmetrical manner, and a plurality of reset clamping jaws 300 are respectively fixed to the corresponding clamping jaws 300.

[0049] The pulling shaft lifting mechanism 500 includes a pulling shaft 520 and a second lifting device 530. The second lifting device 530 is fixed on the top of the cantilever load-bearing member 200. One end of the pulling shaft 520 is fixedly connected to the second lifting device 530. The other end of the pulling shaft 520 sequentially passes through the rotating connection hole, the driven pulley B411 and the rotating support plate of the cantilever load-bearing member 200 and is provided with a rotating body 510. The pulling shaft 520 is movably connected to the driven pulley B411 and the rotating support plate through a linear bearing. The second lifting device 530 drives the rotating body 510 to rise and fall along the extension direction of its own axis through the pulling shaft 520.

[0050] The plurality of reset jaws 300 are symmetrical with respect to the axis of the rotating body 510, and the rotating support mechanism 400 drives the plurality of reset jaws 300 to rotate around the axis of the rotating body 510. The reset jaw 300 includes a contoured jaw 310 and a plurality of spring telescopic shafts 340. Preferably, the number of the spring telescopic shafts 340 is two. The two spring telescopic shafts 340 are fixed between the reset jaw 300 and the rotating support mechanism 400 in parallel with each other. The axes of the two spring telescopic shafts 340 are arranged at an angle to the axis of the rotating body 510. One end of the two spring telescopic shafts 340 connected to the reset jaw 300 is higher than one end connected to the jaw fixing plate 430, so that the opening and closing movement of the reset jaw 300 includes reciprocating movement in two directions, namely, the radial direction of the rotating body 510 and the axial direction of the rotating body 510. Preferably, one end of the spring telescopic shaft 340 is threadedly connected to the reset jaw 300, and the other end is fixed to the jaw fixing plate 430 through a linear bearing. The side of the profiling clamp 310 adjacent to the rotating body 510 has a clamping portion 330 and a supporting portion 320. The clamping portion 330 is located below the supporting portion 320, and the clamping portion 330 has an arc that matches the lens module 700. The supporting surface of the supporting portion 320 in contact with the rotating body 510 is a plane or an arc surface, and a distance difference is set between the vertical distances from any two points on the axis of the rotating body 510 to the supporting surface, that is, during the lifting and lowering process of the rotating body 510, the vertical distance between any point on the axis of the rotating body 510 and the supporting surface tends to gradually increase or decrease. Preferably, a universal ball 350 is movably embedded in the supporting surface, and the universal ball 350 is crimped with the rotating body 510.

[0051] In this embodiment, the rotating body 510 is cylindrical; the top support portion 320 of the reset clamp 300 is wedge-shaped, the top support surface is an inclined surface, and the inclined surface is inclined toward the cantilever load-bearing plate. The pressure contact points between the reset clamp 300 and the rotating body 510 are not fixed, and these pressure contact points are arranged in a straight line on the top support surface. In this embodiment, the pull shaft 520 drives the rotating body 510 to rise, so that a number of reset clamps 300 are in a clamped state; the pull shaft 520 drives the rotating body 510 to lower, so that a number of reset clamps 300 are in an open state.

[0052] In this embodiment, the second lifting device 530 further includes a sliding cylinder 531 and a pulling plate assembly 532. The sliding cylinder 531 is fixed on the top of the cantilever load-bearing member 200, and the pulling plate assembly 532 is arranged between the sliding cylinder 531 and the pulling shaft 520 to drive the pulling shaft 520 to reciprocate along the extension direction of the axis of the rotating body 510.

[0053] In this embodiment, the first lifting device 100 further includes a fixed base 110, a first pulley transmission assembly 120, a ball screw assembly 130 and a linear guide 140. The first pulley transmission assembly 120 is arranged at the top or bottom of the fixed base 110. The first pulley transmission assembly 120 includes a driven pulley A121, a driving pulley A122, a transmission belt A123 and a driving motor A124. The fixed base 110 is in an I-shape, and two transmission connection holes are provided on the top thereof, so that the driven pulley A121 and the driving pulley A122 are movably connected to the top of the fixed base 110 through bearings, and the driving motor A124 that drives the driving pulley A122 to rotate is fixedly connected to the fixed base 110. The linear guide 140 cooperates with the ball screw assembly 130 and is vertically fixed to the side of the fixed base 110. The upper and lower ends of the ball screw assembly 130 are fixed on the fixed base 110 through bearings, and one end of the ball screw assembly 130 passes through the fixed base 110 and is fixedly connected to the driven pulley A121 through the transmission connection hole. One end of the cantilever load-bearing member 200 is fixedly connected to the ball screw assembly 130 and slidably cooperates with the linear guide 140, so that the cantilever load-bearing member 200 is driven by the ball screw assembly 130 to reciprocate and rise and fall along the linear guide 140.

[0054] In this embodiment, a sensor 600 is further provided at the bottom of the cantilever load-bearing member 200 , and the sensor 600 is aligned with a plurality of reset jaws 300 .

[0055] The working principle of this embodiment is as follows: the lens module 700 is clamped in the fixed fixture 800, the axis of the lens module 700 coincides with the axis of the rotating body 510, and the plurality of reset jaws 300 are aligned with the lens module 700. The first lifting device 100 drives the focusing cantilever to descend, and when the sensor 600 detects that it is at a first predetermined distance from the lens module 700, such as when the plurality of reset jaws 300 are located 4-6 mm above the lens module 700, the sensor 600 feeds back a signal to the control system of the automatic focusing device, and the control system controls the first lifting device 100 to stop descending, and the second lifting device 530 drives the rotating body 510 to descend through the pull shaft 520, so that the plurality of reset jaws 300 are opened along the radial direction of the rotating body 540, and at the same time, the plurality of reset jaws 300 descend a predetermined distance along the axial direction of the rotating body 510, and the plurality of reset jaws 300 are in an open state. When the plurality of reset jaws 300 are in the open state, the control system controls the first lifting device 100 to continue to descend. When the sensor 600 detects that it is at a second predetermined distance from the lens module 700, that is, the lens module 700 is located between the plurality of reset jaws 300, the first lifting device 100 stops descending, and the second lifting device 530 drives the rotating body 510 to rise through the pull shaft 520, so that the plurality of reset jaws 300 rise a predetermined distance along the axial direction of the rotating body 510, and clamp the lens module 700 along the radial direction of the rotating body 510. After the plurality of reset jaws 300 clamp the lens module 700, the control system controls the second pulley transmission mechanism to drive the plurality of reset jaws 300 to rotate, thereby completing the automated focusing operation of the lens module 700.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic focusing device, comprising a first lifting device (100) and a focusing cantilever fixed thereon, characterized in that: The focusing cantilever comprises a cantilever load-bearing member (200), a plurality of reset clamps (300), a rotation support mechanism (400) and a pull-shaft lifting mechanism (500); the rotation support mechanism (400) is arranged at the bottom of the cantilever load-bearing member (200); the pull-shaft lifting mechanism (500) is fixed to the top of the cantilever load-bearing member (200); one end of the pull-shaft lifting mechanism (500) passes through the cantilever load-bearing member (200) and the rotation support mechanism (400) in sequence and is provided with a rotating body (51 0); the plurality of reset jaws (300) are connected to the rotating support mechanism (400) in a manner symmetrical with respect to the axis of the rotating body (510), so that the rotating support mechanism (400) drives the plurality of reset jaws (300) to rotate around the axis of the rotating body (510); the plurality of reset jaws (300) are each provided with a top support portion (320) pressed against the rotating body (510), so that the plurality of reset jaws (300) are opened and closed with the lifting and lowering of the pull shaft lifting mechanism (500); The pulling shaft lifting mechanism (500) comprises a pulling shaft (520) and a second lifting device (530), wherein the second lifting device (530) is fixed on the top of the cantilever load-bearing member (200), one end of the pulling shaft (520) is fixedly connected to the second lifting device (530), and the other end of the pulling shaft (520) passes through the cantilever load-bearing member (200) and the rotating support mechanism (400) in sequence and is provided with a rotating body (510), wherein the moving direction of the rotating body (510) is the same as the extending direction of its axis line; The reset clamp (300) comprises a contour clamp (310) and a plurality of spring telescopic shafts (340), wherein the plurality of spring telescopic shafts (340) are fixed in parallel between the reset clamp (300) and the rotating support mechanism (400) so as to enable the reset clamp (300) to reciprocate along the radial direction of the rotating body (510); the contour clamp (310) has a clamping portion (330) and a supporting portion (320) on one side adjacent to the rotating body (510), wherein the supporting portion (320) is wedge-shaped, and a supporting surface of the supporting portion (320) corresponding to the rotating body (510) is an inclined surface.

2. The automatic focusing device according to claim 1, characterized in that: The supporting portion (320) has a supporting surface pressed against the rotating body (510), and the supporting surface is a plane or an arc surface; a distance difference is set between the vertical distances from any two points on the axis of the rotating body (510) to the supporting surface; and the plurality of reset clamps open and close along the radial direction of the rotating body.

3. The automatic focusing device according to claim 2, characterized in that: The rotating body (510) is a cone, and a universal ball (350) is movably embedded in the top support surface of the top support portion (320), and the universal ball (350) is pressed against the rotating body (510).

4. The automatic focusing device according to claim 1, characterized in that: The second lifting device (530) includes a slide cylinder (531) and a pull plate assembly (532), wherein the slide cylinder (531) is fixed on the top of the cantilever load-bearing member (200), and the pull plate assembly (532) is arranged between the slide cylinder (531) and the pull shaft (520) to drive the pull shaft (520) to reciprocate along the extension direction of the axis of the rotating body (510).

5. The automatic focusing device according to any one of claims 1 to 3, characterized in that: The rotating support mechanism (400) comprises a second pulley transmission assembly (410), a rotating fixed plate (420) and a plurality of clamping jaw fixing plates (430); the second pulley transmission assembly (410) is movably connected to the bottom of the cantilever load-bearing member (200); the top of the rotating fixed plate (420) is fixedly connected to the second pulley transmission assembly (410); the plurality of clamping jaw fixing plates (430) are fixed to the bottom of the rotating fixed plate (420) in a centrally symmetrical manner; and the plurality of resetting clamps (300) are respectively fixed to corresponding clamping jaw fixing plates (430).

6. The automatic focusing device according to any one of claims 1 to 3, characterized in that: The first lifting device (100) comprises a fixed base (110), a first pulley transmission assembly (120), a ball screw assembly (130) and a linear guide rail (140); the first pulley transmission assembly (120) is arranged at the top or bottom of the fixed base (110); the linear guide rail (140) cooperates with the ball screw assembly (130) and is vertically fixed on the fixed base (110); both ends of the ball screw assembly (130) are vertically fixed on the fixed base (110) through bearings; one end of the ball screw assembly (130) passes through the fixed base (110) and is fixedly connected to the first pulley transmission assembly (120); the cantilever load-bearing member (200) is fixedly connected to the ball screw assembly (130) and slidably cooperates with the linear guide rail (140), so that the cantilever load-bearing member (200) is reciprocated and lifted along the linear guide rail (140) under the drive of the ball screw assembly (130).

7. The automatic focusing device according to any one of claims 1 to 3, characterized in that: A sensor (600) is also provided at the bottom of the cantilever load-bearing member (200), and the sensor (600) is aligned with the plurality of reset clamps (300).

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