Optical focusing mechanism

Abstract

The invention discloses an optical focusing mechanism which comprises a fixing cylinder, a lens arranged in the fixing cylinder and a focusing mechanism used for focusing the lens, the fixing cylinder is sleeved with a fixing cover, an installation ring is fixed to the end face of one side of the fixing cover through a bolt, the installation ring is connected with a fixing ring through a telescopic mechanism, and the telescopic mechanism is connected with the fixing ring. The lens is installed in an inner ring of the fixing ring, the focusing mechanism comprises a rotating ring, two sets of adjusting rings are arranged on the side, facing the fixing ring, of the rotating ring, each adjusting ring is composed of a plurality of adjusting blocks, and sliding faces are formed on the sides, facing the fixing ring, of the adjusting blocks. The side, facing the rotating ring, of the fixed ring protrudes outwards to form two butt joint blocks matched with the adjusting ring. According to the optical focusing mechanism, observation is carried out through the through hole, so that the adjustment range can be known, accurate adjustment can be conveniently carried out according to a specified value, and the focusing effect is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of optical equipment, and in particular to an optical focusing mechanism. Background Art

[0002] In optical systems, whether it is photography, microscopic observation or high-precision measurement, the accuracy of focusing is a key factor affecting the final image quality. Traditional focusing techniques often use manual or mechanical drive to adjust the position of lenses or optical components to achieve the purpose of focusing. However, these traditional methods usually have disadvantages such as complex operation, limited focusing accuracy and slow response speed.

[0003] For example, Chinese patent CN110645549A introduces an optical focusing device that uses a slider and rail mechanism to move the lens holder to ensure smooth lens movement. The system simplifies the locking process through the design of the adjustment handle and locking bump, reducing the number of rotations of the adjustment handle. Although this design improves the stability of the lens holder and the convenience of operation, its focusing accuracy and repeatability are still limited by manual operation, especially in precision applications that require fine-tuning, which are difficult to accurately control.

[0004] In addition, manual focus systems rely on the operator's skills and experience, making it difficult to achieve fast and consistent focus. In scientific research, medical and industrial applications, this lack of precise control can lead to significant imaging errors, affecting the quality and reliability of data acquisition.

[0005] In view of these limitations of existing technologies, it is difficult for existing focusing systems to simultaneously meet the requirements of ease of operation and high focusing accuracy, especially in automated and high-throughput application scenarios. Therefore, it is urgent to develop a new optical focusing mechanism that can achieve automated control, improve focusing accuracy and repeatability, and simplify the operating process to meet the high requirements for speed and accuracy in modern optical applications. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] Therefore, an object of the present invention is to provide an optical focusing mechanism, including a fixed barrel, a lens arranged in the fixed barrel, and a focusing mechanism for focusing the lens.

[0008] The fixing tube is sleeved with a fixing cover, and a mounting ring is fixed by bolts on one end face of the fixing cover. The mounting ring is connected to the fixing ring through a telescopic mechanism, and the lens is installed in the inner ring of the fixing ring.

[0009] The focusing mechanism includes a rotating ring, and two groups of adjustment rings are arranged on the side of the rotating ring facing the fixed ring. The adjustment ring is composed of a plurality of adjustment blocks, and the adjustment blocks are formed with sliding surfaces facing the side of the fixed ring. The adjustment blocks on the adjustment ring are distributed in a stepped manner, and the height of the adjustment blocks on the adjustment ring gradually decreases in the clockwise direction.

[0010] The fixed ring protrudes outward on one side facing the rotating ring to form two docking blocks that cooperate with the adjusting ring. The docking block is provided with a ball groove on one side facing the adjusting ring. Balls are rollingly connected in the ball grooves, and the balls are in contact with the sliding surface.

[0011] A rotating mechanism for driving the rotating ring to axially rotate is arranged in the fixed cover.

[0012] As the preferred technical solution:

[0013] An optical focusing mechanism as described above, wherein the telescopic mechanism includes a plurality of connecting rods and connecting tubes, wherein the connecting rods and connecting tubes are distributed in a ring shape with the axis of a fixed ring, and elastic springs are sleeved on the connecting rods and connecting tubes, and one end of the connecting tube facing the connecting rod is open, and one end of the connecting rod extends into the interior of the connecting tube through the opening of the connecting tube.

[0014] The outer circular wall of the connecting rod fits with the inner wall of the connecting tube, the end of the connecting rod away from the connecting tube is integrally formed with the side surface of the fixing ring, and the end of the connecting tube away from the connecting rod is integrally formed with the side surface of the mounting ring.

[0015] Both ends of the elastic spring are in contact with the side surfaces of the fixing ring and the mounting ring.

[0016] Through the above technical solution, one end of the connecting rod can move axially in the connecting tube. During the movement, it will be compressed to the elastic spring, and then under the elastic force of the elastic spring, the connecting rod and the connecting tube are elastically movable structures. Similarly, the fixing ring and the mounting ring are also formed into an elastically movable structure through the telescopic mechanism.

[0017] In the optical focusing mechanism as described above, the fixed ring, the mounting ring and the rotating ring have a coaxial centerline, the inner diameters of the fixed ring, the mounting ring and the rotating ring are consistent, and the fixed ring and the rotating ring are parallel to each other.

[0018] Through the above technical solution, the inner diameters of the fixed ring, the mounting ring and the rotating ring are designed so that the mounting ring and the rotating ring will not block the lens. At the same time, when the rotating ring rotates, the adjustment ring thereon can be driven to always be in contact with the docking block, and then the rotating ring can adjust the lens by rotating.

[0019] In an optical focusing mechanism as described above, the two groups of adjustment rings are symmetrically distributed about the rotating ring, the adjustment rings are arc-shaped as a whole, the arc of the adjustment rings is less than 180°, the adjustment blocks are fixedly connected to the rotating ring by bolts, the adjustment blocks are fan-shaped structures, two adjacent adjustment blocks are fitted together, a transition surface is formed on the edge of one side of the adjustment block, and the cross-section of the transition surface is arc-shaped.

[0020] Through the above technical solution, the two sets of rotating rings and the two docking blocks cooperate with each other, so that when adjusting, the fixed ring is evenly stressed and can move smoothly and quickly to avoid jamming during movement. At the same time, the adjustment block and the rotating ring can be freely disassembled and assembled. By replacing the adjustment blocks of different heights, the accuracy of the lens movement can be changed.

[0021] For example, when the height difference between two adjacent adjustment blocks is 1mm, the accuracy of the lens movement is 1mm. When the height difference between two adjacent adjustment blocks is 0.1mm by replacing the adjustment blocks, the accuracy of the lens movement is 0.1mm, thereby increasing the applicability of the entire device.

[0022] In the optical focusing mechanism as described above, the fixed tube and the fixed cover are fixedly bonded, the inner circle of the fixed cover is open, and two symmetrically distributed open grooves are provided on the wall of the fixed tube at the inner circle of the fixed cover, and the curvature of the open grooves is less than 180°.

[0023] Through the above technical solution, the curvature design of the opening groove allows the two opening grooves to have a gap to avoid disconnecting the fixing tube. At the same time, the opening groove is blocked by the ring, and the ring is inside the fixing cover. Through layer-by-layer blocking, light can be prevented from passing through the opening groove to enter the lens, thereby preventing the lens from being disturbed by external light.

[0024] An optical focusing mechanism as described above, the rotating mechanism includes a ring mounted on a fixed tube, the inner circle of the ring is movably connected to the outer circle bearing of the fixed tube, the outer circle of the ring is mounted with a worm wheel fixedly bonded thereto, the worm wheel is meshingly connected with a worm, both ends of the worm wheel pass through a fixed cover and are connected to the fixed cover bearing, and a hexagonal hole is provided on one end face of the worm wheel.

[0025] The outer circular wall of the rotating ring extends outward to form two symmetrically distributed connecting pieces, one end of which passes through the open groove and is fixedly bonded to the inner circle of the sleeve ring.

[0026] Through the above technical solution, the worm and the worm wheel have a self-locking characteristic. When the worm is not rotated under manual drive, the worm wheel can remain in a fixed state, which can ensure that the adjusted lens will not be displaced and the focusing effect is ensured. The connecting piece is used to connect the rotating ring with the rotating mechanism, so that the rotating mechanism can drive the rotating ring to rotate synchronously.

[0027] In the optical focusing mechanism as described above, a through hole is provided at the bottom of the fixed cover, an arc-shaped plate is arranged inside the fixed cover, and a plurality of marking blocks are formed by protruding from the outer circular wall of the arc-shaped plate.

[0028] The center of the arc plate is located on the axis of the collar, and side plates are integrally formed on both sides of the arc plate. The side plates are fixedly bonded to the side surfaces of the collar.

[0029] The arc plate is arc-shaped as a whole, the arc of the arc plate is less than 180°, the arc of the arc plate, the opening groove and the adjustment ring are consistent, and the number of adjustment blocks on the adjustment ring is consistent with the number of marking blocks on the arc plate.

[0030] Through the above technical solution, multiple marking blocks are distributed at equal angles on the outer cylindrical surface of the arc plate. The setting of such through holes can more clearly observe the values ​​on the inverted marking blocks, so as to judge the moving distance of the lens, and then achieve high-precision adjustment. The setting of the side plates enables the arc plate to rotate synchronously through the side plates when the ring rotates axially, and the structure is reasonable.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] (1) Fine focus control and high-precision adjustment capability: In the focus mechanism of the present invention, the adjustment blocks are arranged in a stepped manner, and the gradually changing heights allow the user to adjust the position of the lens with extremely fine resolution. This is achieved by rotating the rotating ring and gradually switching the adjustment blocks of different heights. The precise matching of the adjustment block and the docking block, combined with the contact between the ball and the sliding surface, ensures the smoothness and accuracy of the adjustment process, so that the focus operation has a high degree of accuracy when achieving fine adjustment.

[0033] (2) Self-locking mechanism simplifies operation: By utilizing the self-locking characteristics of the worm gear and worm, the focusing mechanism can automatically lock after completing the focusing, avoiding the error or cumbersome operation introduced by manual locking. This feature is particularly suitable for application scenarios that require frequent focal length adjustment, such as high-precision optical measurement or microscopy, reducing operational complexity and improving work efficiency.

[0034] (3) Structural stability and uniform force: By designing the staggered symmetrical distribution and arc-shaped structure of the two sets of adjustment rings and the rotating ring, the force of the fixed ring is ensured to be uniform during the adjustment process. This design avoids lens offset or jamming caused by uneven force and maintains the smoothness of the adjustment process. In addition, the setting of the elastic spring enhances the restoring force and stability of the overall structure, making the focusing smoother and more reliable.

[0035] (4) Visual adjustment feedback: The through-holes in the design are combined with the marking blocks to provide real-time focusing feedback. By observing the marking blocks on the curved plate, the user can directly see the current lens position and adjustment range, allowing precise adjustment. This intuitive feedback mechanism is a very important feature in high-precision optical applications, especially in scientific research and industrial applications that require precise control of the optical path.

[0036] (5) Replaceability of adjustment blocks and flexibility of adjustment range: The replaceable design of adjustment blocks allows users to replace adjustment blocks of different heights according to specific application requirements, thereby adjusting the minimum unit of lens movement to meet different precision requirements from coarse adjustment to fine adjustment. This provides additional flexibility, allowing the same device to be applied to scenarios with different precision requirements, enhancing the applicability and economy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 It is a front view of the present invention;

[0039] Figure 2 It is a front longitudinal sectional view of the present invention;

[0040] Figure 3 For the present invention Figure 1 Middle AA section view;

[0041] Figure 4 It is a three-dimensional diagram of the fixing cylinder and the opening slot of the present invention;

[0042] Figure 5 A three-dimensional diagram of a fixing ring and a mounting ring of the present invention;

[0043] Figure 6 A cross-sectional view of a docking block and a ball according to the present invention;

[0044] Figure 7 It is a front view of the adjustment block of the present invention;

[0045] Figure 8 A three-dimensional diagram of the adjustment block of the present invention;

[0046] Fig. 9 It is a side view of the docking block and the adjusting block of the present invention;

[0047] Fig.10 It is a three-dimensional diagram of the side plate and the marking block of the present invention.

[0048] In the figure: 1. fixed cylinder; 2. fixed cover; 3. fixed ring; 4. lens; 5. mounting ring; 6. docking block; 601. ball; 602. ball groove; 7. rotating ring; 8. adjusting block; 9. sliding surface; 10. transition surface; 11. connecting piece; 12. collar; 13. worm gear; 14. worm; 15. hexagonal hole; 16. open groove; 17. arc plate; 18. side plate; 19. marking block; 20. through hole; 21. connecting rod; 22. connecting cylinder; 23. elastic spring. DETAILED DESCRIPTION

[0049] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0051] like Figure 1-Figure 3 , Figure 6 , Figure 8-Figure 10 As shown, an embodiment of the present invention discloses an optical focusing mechanism, including a fixed barrel 1, a lens 4 disposed in the fixed barrel 1, and a focusing mechanism for focusing the lens 4.

[0052] A fixing cover 2 is sleeved on the fixing tube 1 , a mounting ring 5 is fixed by bolts on one end face of the fixing cover 2 , the mounting ring 5 is connected to the fixing ring 3 through a telescopic mechanism, and the lens 4 is installed in the inner circle of the fixing ring 3 .

[0053] The focusing mechanism includes a rotating ring 7, which is provided with two groups of adjustment rings on the side facing the fixed ring 3. The adjustment ring is composed of a plurality of adjustment blocks 8. The adjustment blocks 8 are formed with sliding surfaces 9 facing the side facing the fixed ring 3. The adjustment blocks 8 on the adjustment ring are distributed in a stepped manner, and the height of the adjustment blocks 8 on the adjustment ring gradually decreases in the clockwise direction.

[0054] The fixed ring 3 has two docking blocks 6 protruding outward on one side facing the rotating ring 7 and matching with the adjusting ring. The docking block 6 has a ball groove 602 on one side facing the adjusting ring. Balls 601 are rollingly connected in the ball groove 602 and contact the sliding surface 9.

[0055] A through hole 20 is provided at the bottom of the fixed cover 2, and an arc-shaped plate 17 is arranged inside the fixed cover 2. A plurality of marking blocks 19 are protruded from the outer circular wall of the arc-shaped plate 17. The number of the adjustment blocks 8 on the adjustment ring is consistent with the number of the marking blocks 19 on the arc-shaped plate 17. A rotating mechanism for driving the rotating ring 7 to rotate axially is arranged inside the fixed cover 2.

[0056] The number of adjustment blocks 8 and marking blocks 19 is an odd number. Here, for example, there are three adjustment blocks 8 and three marking blocks 19, and the values ​​printed on the three marking blocks 19 are 1, 0, and -1 respectively. Before adjustment, the middle adjustment block 8 of the adjustment ring is in contact with the docking block 6, and the value on the marking block 19 observed through the through hole 20 is 0, which means that the lens 4 on the fixed ring 3 is in the initial position at this time.

[0057] The value printed on the marking block 19 is the height difference between two adjacent adjustment blocks 8. For example, if the height difference between two adjacent adjustment blocks 8 is 1 mm, the value 1 printed on the marking block 19 represents 1 mm, and the value 2 printed on the marking block 19 represents 2 mm.

[0058] When the adjusting ring is rotated clockwise through the rotating mechanism, the adjusting ring can switch the adjusting block 8 to contact with the docking block 6 by rotation. In the clockwise direction, the height of the adjusting block 8 gradually decreases. The height of the adjusting block 8 after switching will increase and can push the docking block 6 to move. The docking block 6 drives the fixing ring 3 and the lens 4 to move synchronously. The focusing operation is completed by adjusting the position of the lens 4. During this process, the arc plate 17 will rotate clockwise synchronously with the adjusting ring. At this time, the value on the marking block 19 observed through the through hole 20 is 1, which means that the lens 4 on the fixing ring 3 has moved forward by a value of 1.

[0059] When the adjusting ring is rotated counterclockwise by the rotating mechanism, the adjusting ring can switch the adjusting block 8 to contact with the docking block 6 by rotation, so that the height of the adjusting block 8 after switching will be reduced. Under the action of the telescopic mechanism, the docking block 6 and the adjusting block 8 will be contacted again by pushing the fixing ring 3, and the focusing operation is completed by adjusting the position of the lens 4. During this process, the arc plate 17 rotates counterclockwise synchronously with the adjusting ring. At this time, the value on the marking block 19 observed through the through hole 20 is -1, which means that the lens 4 on the fixing ring 3 has moved backward by a value of 1.

[0060] By observing the value on the marking block 19 through the through hole 20, the movement range of the lens 4 can be clearly known, thereby improving the focusing accuracy and making quick adjustments as required.

[0061] like Figure 2 and Figure 5As shown, the telescopic mechanism includes multiple groups of connecting rods 21 and connecting tubes 22. The connecting rods 21 and the connecting tubes 22 are distributed in a ring shape with the axis of the fixing ring 3. Elastic springs 23 are sleeved on the connecting rods 21 and the connecting tubes 22. One end of the connecting tube 22 facing the connecting rod 21 is open, and one end of the connecting rod 21 extends into the interior of the connecting tube 22 through the opening of the connecting tube 22.

[0062] The outer circular wall of the connecting rod 21 fits with the inner wall of the connecting tube 22 , the end of the connecting rod 21 away from the connecting tube 22 is integrally formed with the side of the fixing ring 3 , and the end of the connecting tube 22 away from the connecting rod 21 is integrally formed with the side of the mounting ring 5 .

[0063] Both ends of the elastic spring 23 abut against the side surfaces of the fixing ring 3 and the mounting ring 5 .

[0064] In the initial state, the elastic spring 23 is in a compressed state. When the adjusting ring is rotated counterclockwise by the rotating mechanism, the adjusting ring can switch the adjusting block 8 to contact with the docking block 6 by rotating. Since the height of the adjusting block 8 after switching is reduced, the adjusting block 8 will be separated from the docking block 6 at this time, and the elastic spring 23 will push the fixed ring 3 to move toward the rotating ring 7 through elastic potential energy until the docking block 6 contacts the adjusting block 8 again. In this process, the fixed ring 3 completes the focusing by driving the lens 4 to move.

[0065] The connecting rod 21 and the connecting tube 22 cooperate with each other to achieve a guiding function and prevent the fixing ring 3 from moving skewed. The mounting ring 5 and the fixing tube 1 are a detachable mounting structure. When the mounting ring 5 is removed, the fixing ring 3 can be taken out of the fixing tube 1 through the connecting rod 21 and the connecting tube 22, thereby facilitating the maintenance or replacement of the lens 4.

[0066] like Figure 1 , Figure 7 and Figure 8 As shown, the fixed ring 3, the mounting ring 5 and the rotating ring 7 are coaxial, the inner diameters of the fixed ring 3, the mounting ring 5 and the rotating ring 7 are all consistent, the fixed ring 3 and the rotating ring 7 are parallel to each other, the two groups of adjustment rings are staggered and symmetrically distributed about the rotating ring 7, the adjustment ring is arc-shaped as a whole, the arc of the adjustment ring is less than 180°, the adjustment block 8 is fixedly connected to the rotating ring 7 by bolts, the adjustment block 8 is a fan-shaped structure, two adjacent adjustment blocks 8 are fitted together, a transition surface 10 is formed on the edge of one side of the adjustment block 8, and the cross-section of the transition surface 10 is arc-shaped.

[0067] When the rotating ring 7 drives the adjusting block 8 to rotate, the adjusting block 8 will be displaced with the docking block 6, and the ball 601 on the docking block 6 can roll freely in the ball groove 602, so that the docking block 6 can roll on the sliding surface 9 through the ball 601. The rotating ring 7 can switch different adjusting blocks 8 to correspond to the docking block 6 by rotating.

[0068] By setting the transition surface 10, the ball 601 is not blocked when rolling on two adjacent sliding surfaces 9, and the rolling is smoother. In this way, the rotating ring 7 can adjust the position of the lens 4 quickly and smoothly by rotating.

[0069] like Figure 2 , Figure 3 and Figure 4 As shown, the fixed cylinder 1 and the fixed cover 2 are fixedly bonded, the inner circle of the fixed cover 2 is open, and two symmetrically distributed opening grooves 16 are opened on the wall of the fixed cylinder 1 at the inner circle of the fixed cover 2, and the curvature of the opening grooves 16 is less than 180°.

[0070] The rotating mechanism includes a ring 12 sleeved on the fixed cylinder 1, the inner circle of the ring 12 is movably connected to the outer circle bearing of the fixed cylinder 1, a worm wheel 13 is sleeved on the outer circle of the ring 12 and fixedly bonded thereto, the worm wheel 13 is meshingly connected with a worm 14, both ends of the worm 14 pass through the fixed cover 2 and are connected to the bearing of the fixed cover 2, and a hexagonal hole 15 is provided on one end face of the worm 14.

[0071] The outer circumferential wall of the rotating ring 7 extends outward to form two symmetrically distributed connecting pieces 11 , one end of the connecting piece 11 passes through the opening groove 16 and is fixedly bonded to the inner circle of the sleeve ring 12 .

[0072] When making adjustments, a tool matching the hexagonal hole 15 can be used to twist the worm 14, which will drive the worm wheel 13 to rotate, and the collar 12 will rotate axially synchronously with the worm wheel 13, the connecting piece 11 will rotate with the collar 12 in the opening groove 16, and the connecting piece 11 will drive the rotating ring 7 to rotate synchronously, so that the rotating ring 7 can achieve position adjustment of the lens 4 by driving the adjusting ring, thereby completing the focusing operation.

[0073] like Figure 2 , Figure 3 and Fig.10 As shown, the center of the arc plate 17 is located on the axis line of the collar 12, and side plates 18 are integrally formed on both sides of the arc plate 17. The side plates 18 are fixedly bonded to the sides of the collar 12. The arc plate 17 is arc-shaped as a whole, and the curvature of the arc plate 17 is less than 180°. The arc plate 17 and the opening groove 16 and the adjustment ring are all consistent in curvature.

[0074] The collar 12 and the rotating ring 7 can rotate synchronously through the connecting piece 11. When the collar 12 rotates, the arc plate 17 can be driven to rotate through the side plate 18, so that the collar 12, the rotating ring 7 and the arc plate 17 can rotate synchronously.

[0075] The curvature of the opening slot 16 limits the rotation range of the rotating ring 7. For example, when the curvature of the opening slot 16 is 120°, the connecting piece 11 can only rotate 60° clockwise and 60° counterclockwise in the opening slot 16, so that the rotating ring 7 can only rotate 60° clockwise and 60° counterclockwise, and the rotation range is ±60°.

[0076] The arc of the arc plate 17 is also 120°, and its rotation range is also ±60°, which can prevent the arc plate 17 from touching the worm 14 during rotation due to excessive arc length, ensuring that the arc plate 17 can rotate smoothly.

[0077] In the description of this specification, "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical focusing mechanism, comprising a fixed barrel (1), a lens (4) arranged in the fixed barrel (1), and a focusing mechanism for focusing the lens (4), Features: The fixing tube (1) is sleeved with a fixing cover (2), a mounting ring (5) is fixed to one end face of the fixing cover (2) by bolts, the mounting ring (5) is connected to the fixing ring (3) via a telescopic mechanism, and the lens (4) is mounted in the inner ring of the fixing ring (3). The focusing mechanism comprises a rotating ring (7), wherein the rotating ring (7) is provided with two groups of adjustment rings on a side facing the fixed ring (3), wherein the adjustment ring is composed of a plurality of adjustment blocks (8), wherein the adjustment blocks (8) are formed with sliding surfaces (9) on a side facing the fixed ring (3), and wherein the adjustment blocks (8) on the adjustment ring are distributed in a stepped manner, and the height of the adjustment blocks (8) on the adjustment ring gradually decreases in a clockwise direction. The fixed ring (3) is formed with two docking blocks (6) that are matched with the adjustment ring and protrude outward on one side facing the rotating ring (7). The docking block (6) is provided with a ball groove (602) on one side facing the adjustment ring. A ball (601) is rollingly connected in the ball groove (602). The ball (601) is in contact with the sliding surface (9). A rotating mechanism for driving the rotating ring (7) to rotate axially is arranged in the fixed cover (2).

2. An optical focusing mechanism according to claim 1, characterized in that: The telescopic mechanism comprises a plurality of groups of connecting rods (21) and connecting tubes (22), wherein the connecting rods (21) and the connecting tubes (22) are distributed in a ring shape with the axis of the fixing ring (3), and elastic springs (23) are sleeved on the connecting rods (21) and the connecting tubes (22). One end of the connecting tube (22) facing the connecting rod (21) is open, and one end of the connecting rod (21) extends into the interior of the connecting tube (22) through the open end of the connecting tube (22).

3. An optical focusing mechanism according to claim 2, characterized in that: The outer circular wall of the connecting rod (21) is in contact with the inner wall of the connecting tube (22); the end of the connecting rod (21) away from the connecting tube (22) is integrally formed with the side surface of the fixing ring (3); and the end of the connecting tube (22) away from the connecting rod (21) is integrally formed with the side surface of the mounting ring (5). Both ends of the elastic spring (23) abut against the side surfaces of the fixing ring (3) and the mounting ring (5).

4. The optical focusing mechanism according to claim 1, characterized in that: The fixed ring (3), the mounting ring (5) and the rotating ring (7) are coaxial, the inner diameters of the fixed ring (3), the mounting ring (5) and the rotating ring (7) are consistent, and the fixed ring (3) and the rotating ring (7) are parallel to each other.

5. The optical focusing mechanism according to claim 1, characterized in that: The two groups of adjustment rings are staggered and symmetrically distributed about the rotating ring (7); the adjustment rings are arc-shaped as a whole; the arc of the adjustment rings is less than 180°; the adjustment blocks (8) are fixedly connected to the rotating ring (7) by bolts; the adjustment blocks (8) are fan-shaped structures; two adjacent adjustment blocks (8) are fitted together; a transition surface (10) is formed on one side edge of the adjustment block (8); and the cross-section of the transition surface (10) is arc-shaped.

6. The optical focusing mechanism according to claim 1, characterized in that: The fixed cylinder (1) and the fixed cover (2) are fixedly bonded, the inner circle of the fixed cover (2) is open, and two symmetrically distributed opening grooves (16) are provided on the wall of the fixed cylinder (1) at the inner circle of the fixed cover (2), and the arc of the opening grooves (16) is less than 180°.

7. An optical focusing mechanism according to claim 6, characterized in that: The rotating mechanism comprises a sleeve (12) sleeved on the fixed cylinder (1), the inner circle of the sleeve (12) being movably connected to the outer circle bearing of the fixed cylinder (1), a worm wheel (13) being sleeved on the outer circle of the sleeve (12) and fixedly bonded thereto, the worm wheel (13) being meshingly connected to a worm (14), the two ends of the worm (14) passing through the fixed cover (2) and being connected to the bearing of the fixed cover (2), and a hexagonal hole (15) being formed on one end surface of the worm (14).

8. An optical focusing mechanism according to claim 7, characterized in that: The outer circular wall of the rotating ring (7) extends outward to form two symmetrically distributed connecting pieces (11), one end of the connecting piece (11) passes through the open groove (16) and is fixedly bonded to the inner circle of the sleeve ring (12).

9. The optical focusing mechanism according to claim 1, characterized in that: A through hole (20) is provided at the bottom of the fixed cover (2), an arc-shaped plate (17) is provided inside the fixed cover (2), and a plurality of marking blocks (19) are formed on the outer circular wall of the arc-shaped plate (17). The center of the arc plate (17) is located on the axis of the collar (12), and side plates (18) are integrally formed on both sides of the arc plate (17), and the side plates (18) are fixedly bonded to the side surfaces of the collar (12).

10. An optical focusing mechanism according to claim 9, characterized in that: The arc plate (17) is arc-shaped as a whole, the arc of the arc plate (17) is less than 180 degrees, the arc of the arc plate (17) and the opening groove (16) and the adjustment ring are consistent, and the number of adjustment blocks (8) on the adjustment ring is consistent with the number of marking blocks (19) on the arc plate (17).

Images