Focusing structure

Abstract

The utility model discloses a focusing structure, relates to the optics technology field, the focusing structure comprises a mounting support, a driving cylinder, a lens cone and an elastic structure, the driving cylinder is arranged on the mounting support along the front and back direction and can rotate along the axis along the front and back direction, the peripheral wall of the driving cylinder is provided with at least one driving chute, the driving chute extends along the front and back direction, and the elastic structure is arranged on the lens cone. The front end of the driving chute and the rear end of the driving chute are staggered along the circumferential direction of the lens cone; the lens barrel is movably installed in the fixing barrel in the front-back direction, at least one connecting piece is fixed to the outer circumferential wall of the lens barrel, the connecting piece is installed in the driving inclined groove in a sliding mode, and when the driving barrel rotates relative to the lens barrel, the driving inclined groove drives the connecting piece to drive the lens barrel to move front and back; the elastic structure is arranged between the rear end of the lens barrel and the mounting bracket and is used for providing elastic force when the lens barrel moves forwards; through the arrangement, the focusing structure capable of realizing high-precision and high-stability focusing is provided.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, and in particular to a focusing structure. Background Technology

[0002] Traditional focusing mechanisms typically rely on sliding friction to adjust the lens position. This method is prone to wear and tear, affecting the lifespan and accuracy of the focusing system. Furthermore, traditional structures may have gaps between moving parts, which can introduce errors during focusing and degrade image quality. Therefore, developing a focusing mechanism that offers greater stability and accuracy is of significant practical importance. Utility Model Content

[0003] The main objective of this invention is to propose a focusing structure that can achieve high-precision and high-stability focusing.

[0004] To achieve the above objectives, the focusing structure proposed in this utility model includes:

[0005] Mounting bracket;

[0006] A drive cylinder is disposed on the mounting bracket in the front-rear direction and is rotatable along the front-rear axis. At least one drive groove is formed on the peripheral wall of the drive cylinder. The drive groove extends in the front-rear direction, and the front end and the rear end of the drive groove are offset from each other in the circumference of the lens barrel.

[0007] A microscope tube is movably mounted within the fixed tube in a front-to-back direction. At least one connector is fixed to the outer peripheral wall of the microscope tube. The connector is slidably mounted within the drive groove. When the drive tube rotates relative to the microscope tube, the drive groove drives the connector, causing the microscope tube to move back and forth.

[0008] An elastic structure is disposed between the rear end of the lens barrel and the mounting bracket to provide a forward elastic force when the lens barrel moves back and forth.

[0009] In one embodiment, the peripheral wall of the lens barrel is provided with a groove corresponding to the drive groove;

[0010] The connector includes:

[0011] The first bearing is disposed within the drive slant groove;

[0012] A pin passes through the inner hole of the first bearing to secure it to the groove of the lens barrel.

[0013] In one embodiment, the focusing structure further includes a connecting plate and a cover plate. The connecting plate is fixedly connected to the mounting bracket and is disposed corresponding to the rear end face of the drive cylinder. The cover plate covers the mounting bracket and includes multiple through holes for accommodating the drive cylinder.

[0014] The elastic structure includes:

[0015] At least one guide shaft is disposed between the cover plate and the connecting plate in the front-rear direction, and the guide shaft passes through the rear end face of the lens barrel;

[0016] At least one spring is sleeved on the guide shaft, and the two ends of the spring abut against the front end face of the connecting plate and the rear end face of the lens barrel, respectively, to provide elastic force when the lens barrel moves back and forth.

[0017] In one embodiment, the focusing structure further includes a drive motor disposed on the mounting bracket, the drive motor including an output shaft extending in a front-rear direction, and a first gear disposed on the output shaft;

[0018] The outer peripheral wall of the drive cylinder is provided with an annular rack that meshes with the first gear.

[0019] In one embodiment, the focusing structure includes an encoder disposed on the mounting bracket for detecting the rotation angle of the drive cylinder, the encoder comprising:

[0020] The encoder body is fixedly connected to the mounting bracket;

[0021] An encoder shaft extends in the front-to-back direction, and a second gear that meshes with the annular rack is provided on the encoder shaft;

[0022] A magnetic grating is disposed on one end of the encoder shaft away from the second gear, and the encoder body covers the magnetic grating.

[0023] A torsion spring is sleeved on the outside of the encoder shaft. One end of the torsion spring abuts against the mounting bracket in the front-rear direction, and at least part of the other end is disposed in the inner hole of the second gear. It is used to apply a preload force along the circumference of the encoder shaft to the second gear and a preload force along the direction away from the encoder body to the encoder shaft when the annular rack drives the second gear to rotate.

[0024] In one embodiment, the focusing structure further includes a fixing cylinder disposed between the driving cylinder and the lens barrel in a front-rear direction. The peripheral wall of the fixing cylinder is formed with at least one driving straight groove corresponding to the driving inclined groove, and the driving straight groove extends in a front-rear direction.

[0025] The connector passes through the drive straight groove to slide in conjunction with the drive inclined groove, and slides along the drive straight groove when the drive cylinder rotates relative to the lens barrel.

[0026] In one embodiment, a second bearing is provided in the drive straight groove, and the connecting member extends into the drive inclined groove through at least part of the inner hole of the second bearing.

[0027] In one embodiment, the front end of the fixed cylinder and the side facing the driving cylinder respectively form a first annular groove for accommodating the ball bearings; and / or,

[0028] The focusing structure also includes a connecting plate, which is fixedly connected to the mounting bracket and is provided corresponding to the rear end face of the drive cylinder. The connecting plate and the side facing the rear end face of the drive cylinder respectively form a second annular groove for accommodating the ball bearings.

[0029] In one embodiment, the rear end face of the fixed cylinder is provided with a threaded hole;

[0030] The focusing structure includes a connecting screw, including a screw head, the connecting screw passing through the threaded hole and the screw head abutting against the mounting bracket;

[0031] A first washer is provided between the screw head and the rear end face of the fixing cylinder.

[0032] In one embodiment, the peripheral wall of the lens barrel is provided with a groove corresponding to the drive groove, and the connecting member includes a first bearing and a pin. The first bearing is disposed in the drive groove, and the pin passes through the inner hole of the first bearing to be fixed to the groove of the lens barrel.

[0033] A second bearing is provided inside the drive groove;

[0034] A second shim is provided between the first bearing and the second bearing, and / or between the second bearing and the lens barrel, and / or between the first bearing and the pin head.

[0035] In this invention, the drive cylinder is fixed to the mounting bracket, resulting in high installation strength. A drive groove is provided on the drive cylinder, which cooperates with the connecting member on the lens barrel. Simply rotating the drive cylinder drives the lens barrel to move back and forth, achieving focusing. The lens barrel does not rotate directly, thus avoiding the problem of mismatched resolving power caused by changes in the eccentricity during rotation. Furthermore, the elastic structure provides a forward elastic force during the lens barrel's back and forth movement, thereby pressing the connecting member and the drive groove together in the forward and backward direction, reducing the gap between them and improving the focusing accuracy. This design provides a focusing structure that achieves high precision and high stability focusing. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 A schematic diagram of an embodiment of the focusing structure provided by this utility model;

[0038] Figure 2 for Figure 1 A schematic diagram of the focusing structure from another perspective;

[0039] Figure 3 for Figure 2 Cross-sectional view of the drive cylinder at point AA;

[0040] Figure 4 for Figure 1 Cross-sectional view of the drive motor and encoder at BB.

[0041] Explanation of icon numbers:

[0042] 100. Focusing structure; 1. Mounting bracket; 2. Drive cylinder; 21. Drive slant groove; 22. Annular rack; 23. First annular groove; 24. Second annular groove; 3. Lens barrel; 31. Groove; 4. Connector; 41. First bearing; 42. Pin; 42. Second bearing; 5. Elastic structure; 51. Guide shaft; 52. Spring; 6. Drive motor; 61. Output shaft; 62. First gear; 7. Encoder; 71. Encoder shaft; 72. Magnetic grid; 73. Encoder body; 74. Torsion spring; 75. Second gear; 8. Fixing cylinder; 81. Drive straight groove; 82. Threaded hole; 9. Gasket structure; 91. First gasket; 92. Second gasket; 10. Connecting plate; 11. Cover plate.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0045] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] This utility model proposes a focusing structure 100.

[0048] Please see Figure 1In one embodiment of this utility model, the focusing structure 100 includes a mounting bracket 1, a drive cylinder 2, a lens barrel 3, and an elastic structure 5. The drive cylinder 2 is disposed on the mounting bracket 1 in a front-rear direction and is rotatable along the front-rear axis. At least one drive groove 21 is formed on the peripheral wall of the drive cylinder 2. The drive groove 21 extends in a front-rear direction, and the front end and rear end of the drive groove 21 are offset from each other in the circumferential direction of the lens barrel 3. The lens barrel 3 is movably installed in the fixed cylinder 8 in a front-rear direction. At least one connector 4 is fixed on the outer peripheral wall of the lens barrel 3. The connector 4 is slidably installed in the drive groove 21. When the drive cylinder 2 rotates relative to the lens barrel 3, the drive groove 21 drives the connector 4 to move the lens barrel 3 back and forth. The elastic structure 5 is disposed between the rear end of the lens barrel 3 and the mounting bracket 1 to provide elastic force when the lens barrel 3 moves forward.

[0049] It should be noted that the number of drive grooves 21 can be determined by comprehensively considering the adjustment stroke and adjustment accuracy of the actual focusing structure 100. Since the drive cylinder 2 is generally subjected to force at one or two points, resulting in poor stability, preferably, three drive grooves 21 and three connecting pieces 4 are provided. The three connecting pieces 4 and the three drive grooves 21 form a stable three-point structure, further improving the stability and accuracy of the lens barrel 3's movement. The built-in lens barrel 3 ensures the stability of the product's performance during transportation through these three points, achieving stable force application.

[0050] In the technical solution of this utility model, by fixing the drive cylinder 2 to the mounting bracket 1, the installation strength is high. The drive groove 21 is provided on the drive cylinder 2, which cooperates with the connecting member 4 provided on the lens barrel 3. Simply rotating the drive cylinder 2 drives the lens barrel 3 to move back and forth, achieving focusing. The lens barrel 3 does not rotate directly, thus avoiding the problem of inconsistent resolving power caused by changes in the eccentricity with rotation. Furthermore, by providing the elastic structure 5, a forward elastic force is provided when the lens barrel 3 moves back and forth, thereby pressing the connecting member 4 and the drive groove 21 together in the front-back direction, reducing the gap between the connecting member 4 and the drive groove 21, and improving the accuracy of the focusing structure 100. Through this design, a focusing structure 100 that can achieve high-precision and high-stability focusing is provided.

[0051] Specifically, to provide a longer service life, in one embodiment of this utility model, the peripheral wall of the lens barrel 3 is provided with a groove corresponding to the drive inclined groove 21; the connecting member 4 includes a first bearing 41 and a pin 42, the first bearing 41 being disposed within the drive inclined groove 21; the pin 42 passes through the inner hole of the first bearing 41 to be fixed to the groove of the lens barrel 3. By providing the first bearing 41, the screw and the drive inclined groove 21 are subjected to rolling friction, thereby reducing wear and improving the service life of the focusing structure 100. It can be understood that the connecting member 4 may also be a first protrusion provided along the peripheral side of the lens barrel 3, and the first protrusion cooperates with the drive inclined groove 21, the first protrusion passing through the inner hole of the first bearing 41 to be fixed to the drive inclined groove 21.

[0052] Furthermore, in one embodiment of this utility model, the focusing structure 100 further includes a connecting plate and a cover plate. The connecting plate is fixedly connected to the mounting bracket 1 and is disposed corresponding to the rear end face of the drive cylinder 2. The cover plate covers the mounting bracket 1 and includes multiple through holes for accommodating the drive cylinder 2, the drive motor 6, and the encoder. The elastic structure 5 includes at least one guide shaft 51 and at least one spring 52. The guide shaft 51 is disposed between the cover plate and the connecting plate in a front-rear direction and passes through the rear end face of the lens barrel 3. The spring 52 is sleeved on... On the guide shaft 51, the two ends of the spring 52 abut against the front end face of the connecting plate and the rear end face of the lens barrel 3, respectively, to provide elastic force when the lens barrel 3 moves back and forth. By setting the cover plate and the connecting plate, the drive cylinder 2 is further fixed, and the stability of the drive device is improved. In addition, by setting the two ends of the spring 52, the spring 52 provides forward elastic force when the lens barrel 3 moves back and forth, thereby pressing the connecting piece 4 against the drive inclined groove 21 in the front and rear direction, reducing the gap between the connecting piece 4 and the drive inclined groove 21, and improving the accuracy of the focusing structure 100. It is understandable that, in order to avoid the focusing components such as sensors in the middle of the lens barrel 3, the guide shaft 51 and spring 52 are difficult to be placed near the middle, which would result in uneven force on the rear end face of the lens barrel 3 and easy to cause tilting perpendicular to the axial direction. Therefore, multiple guide shafts 51 and springs 52 can be provided, and multiple guide shafts 51 are arranged at intervals around the rear end face of the lens. In this embodiment, there are three guide shafts 51 and three springs 52. The torques perpendicular to the axial direction formed by the three springs 52 cancel each other out, thereby jointly providing a stable forward and backward elastic force.

[0053] In one embodiment of this utility model, the focusing structure 100 further includes a drive motor 6 disposed on the mounting bracket 1. The drive motor 6 includes an output shaft 61 extending in the front-rear direction, and a first gear 62 is disposed on the output shaft 61. The outer peripheral wall of the drive cylinder 2 is provided with an annular rack 22 that meshes with the first gear 62. Through the gear and rack engagement, the drive motor 6 can precisely control the rotation angle of the drive cylinder 2, thereby precisely controlling the distance of the lens barrel 3 moving in the front-rear direction to complete focusing. It is understood that this utility model does not limit the way the drive cylinder 2 is driven to rotate. For ease of adjustment, the drive cylinder 2 can also be manually rotated to complete focusing.

[0054] In one embodiment of this utility model, the focusing structure 100 includes an encoder 7 for detecting the rotation angle of the drive cylinder 2. The encoder 7 includes an encoder shaft 71, a magnetic grating 72, and an encoder body 73. The encoder shaft 71 extends in a front-rear direction and is provided with a second gear that meshes with the annular rack 22. The magnetic grating 72 is disposed on the encoder shaft 71 at one end away from the second gear. The encoder body 73 is fixedly connected to the mounting bracket 1 and covers the magnetic grating 72.

[0055] It should be noted that an encoder is a sensor used to convert mechanical motion into electrical signal output for precise measurement and feedback of focusing position or motion state. The magnetic grating 72 is one of the key components of the encoder, composed of a series of magnetic materials arranged according to a specific pattern. However, to reduce mechanical wear, the magnetic grating 72 is typically non-contact, which also reduces errors caused by mechanical friction. The encoder body 73 covers the magnetic grating 72. When the magnetic grating 72 moves along its mating encoder body 73, it can sense changes in the magnetic field, thereby accurately calculating the relative displacement. It also provides physical protection for the sensitive electronic components inside the encoder, preventing damage from external factors such as dust, moisture, and impact. This helps extend the encoder's lifespan and maintain its stable performance.

[0056] When the drive motor 6 drives the drive cylinder 2 to rotate, the second gear on the encoder shaft 71 meshes with the ring rack 22 and rotates synchronously, thereby driving the magnetic grating 72 to rotate relative to the encoder body 73, thus detecting the rotation angle of the drive cylinder 2 in real time, improving the accuracy and reliability of the focusing system mechanism.

[0057] Furthermore, it is understood that if the second gear does not tightly engage with the annular rack 22, when the drive cylinder 2 rotates, it will travel a period of idle stroke before engaging with the second gear, resulting in the encoder measuring an angle that is too small and affecting the measurement accuracy. In addition, the magnetic grating 72 is usually non-contact. If it comes into contact with the encoder body 73 during transportation and use, it will cause damage to the magnetic grating 72. Therefore, in one embodiment of this utility model, the encoder also includes a torsion spring 74. The torsion spring 74 is sleeved on the outside of the encoder shaft 71. One end of the torsion spring 74 abuts against the mounting bracket 1 in the front-rear direction, and at least part of the other end is disposed in the inner hole of the second gear. It is used to apply a preload force along the circumference of the encoder shaft 71 to the second gear and a preload force along the direction away from the encoder body 73 to the encoder shaft 71 when the annular rack 22 drives the second gear to rotate. By setting the torsion spring 74, a preload force is applied to the encoder shaft 71 in a direction away from the encoder body 73, thereby ensuring a stable gap between the magnetic grating 72 and the encoder body 73 and preventing damage to the magnetic grating 72; the torsion spring 74 also applies a preload force to the second gear in the circumferential direction of the encoder shaft 71, thereby ensuring that the second gear and the encoder are always in close contact, eliminating gaps and improving measurement accuracy.

[0058] Furthermore, it is understood that the torsion springs may also be springs and torsion springs respectively provided on the encoder shaft, thereby applying a preload force to the encoder shaft 71 in a direction away from the encoder body 73, and applying a preload force to the second gear in the circumferential direction of the encoder shaft 71.

[0059] To make the drive cylinder 2 more stable when driving the lens barrel 3 to move back and forth, in one embodiment of the present invention, the focusing structure 100 further includes a fixed cylinder 8, which is disposed between the drive cylinder 2 and the lens barrel 3 in the front-back direction. The peripheral wall of the fixed cylinder 8 forms at least one drive straight groove 81 corresponding to the drive inclined groove 21, and the drive straight groove 81 extends in the front-back direction. The connecting member 4 passes through the drive straight groove 81 to slide with the drive inclined groove 21. When the drive cylinder 2 rotates relative to the lens barrel 3, the connecting member 4 slides along the drive straight groove 81. When the drive cylinder 2 rotates relative to the fixed cylinder 8, the connecting member 4 is constrained by the side wall of the drive straight groove 81, so that the connecting member 4 can only move along the drive straight groove 81, thereby driving the lens barrel 3 to move only in the front-back direction and avoiding circumferential displacement. It is understood that the drive groove 81 can also be set on the periphery of the lens barrel 3, and the first protrusion is provided on the inner wall of the fixed cylinder 8. However, considering the actual size of the lens barrel 3 and the fixed cylinder 8, as well as the specific arrangement, it can be set according to actual needs.

[0060] Furthermore, in one embodiment of this utility model, a second bearing 42 is provided within the drive straight groove 81, and the connecting member 4 extends into the drive inclined groove 21 through at least a portion of the inner hole of the second bearing 42. By providing the second bearing 42, rolling friction is achieved between the connecting member 4 and the drive straight groove 81, thereby reducing wear and improving the service life of the focusing structure 100. It is understood that in another embodiment, when the connecting member 4 includes the pin 42 and the first bearing 41, the pin 42 can be slidably connected to the drive inclined groove 21 and the drive straight groove 81 via the first bearing 41 and the second bearing 42 respectively, thereby further reducing wear and improving service life.

[0061] Furthermore, it is understood that during transportation and use, the bearing will inevitably vibrate and shift axially along the pin 42, which may lead to the bearing falling off. Therefore, in one embodiment of this invention, the peripheral wall of the lens barrel 3 is provided with a groove corresponding to the drive groove 21. The connecting member 4 includes a first bearing 41 and a pin 42, the first bearing 41 being disposed within the drive groove 21. The pin 42 passes through the inner hole of the first bearing 41 to be fixed to the groove of the lens barrel 3. The focusing structure 100 includes a shim structure 9, the shim structure 9 including a first shim 91, the first shim 91 being disposed between the first bearing 41 and the lens barrel 3 and / or between the first bearing 41 and the head of the pin 42. By providing the first shim 91, the distance between the first bearing 41 and the lens barrel 3 and between the first bearing 41 and the head of the pin 42 is maintained, thereby eliminating gaps and improving transmission accuracy.

[0062] Further, in one embodiment of this utility model, the peripheral wall of the lens barrel 3 is provided with a groove corresponding to the driving inclined groove 21; the connecting member 4 includes a first bearing 41, a second bearing 42, and a pin 42, the first bearing 41 being disposed in the driving inclined groove 21; the pin 42 passing through the inner hole of the first bearing 41 to be fixed to the groove of the lens barrel 3, the second bearing 42 being sleeved in the driving straight groove 81, and the pin 42 being rotatably engaged with the driving straight groove 81 through the second bearing 42; when the connecting member 4 further includes a second bearing 41... When bearing 42 is used, the first shim 91 can also be provided between the first bearing 41 and the second bearing 42, between the second bearing 42 and the lens barrel 3, and between the first bearing 41 and the head of the pin 42. It can be understood that the first shim 91 can be provided selectively. However, in order to better maintain and eliminate gaps, in this embodiment, the first shim 91 is provided between the first bearing 41 and the second bearing 42, between the second bearing 42 and the lens barrel 3, and between the first bearing 41 and the head of the pin 42.

[0063] Furthermore, since the fixed cylinder 8 is located between the driving cylinder 2 and the mirror cylinder 3, and its rear end face does not directly abut against the mounting bracket 1, in order to increase the stability of the fixed cylinder 8, in one embodiment of this utility model, the rear end face of the fixed cylinder 8 is provided with a threaded hole 82 for screw connection, and the rear end face of the screw head abuts against the mounting bracket 1; the second washer 92 is located between the screw head and the rear end face of the fixed cylinder 8; it can be understood that if the sum of the thickness of the second washer 92 and the screw head is H, and the distance between the rear end face of the fixed cylinder 8 and the mounting bracket 1 is h, then H is slightly greater than h, so that the second washer 92 and the screw head are interference-fitted between the rear end face of the fixed cylinder 8 and the mounting bracket 1, eliminating the gap between the rear end face of the fixed cylinder 8 and the mounting bracket 1, and increasing the stability of the fixed cylinder 8.

[0064] Furthermore, in order to prevent the lens barrel 3 from colliding with the drive cylinder 2 and the mounting bracket 1 during the rearward movement for focusing, in one embodiment of this utility model, a limiting block is provided on the rear end face of the lens barrel 3 to limit the rearward movement range of the lens barrel 3; wherein, the limiting block can be an elastic rubber block or a spring 52, so that the lens barrel 3 makes soft contact with the drive cylinder 2 and the mounting bracket 1, preventing the lens barrel 3 from displacing too much and causing damage.

[0065] It is understandable that the rotation of the drive cylinder 2 along its front-rear axis will cause wear on the front and rear end faces of the drive cylinder 2. Therefore, in one embodiment of this utility model, the front end of the fixed cylinder 8 contacts the side opposite to the drive cylinder 2, and a first annular groove 23 is formed on the front end of the fixed cylinder 8 and the side opposite to the drive cylinder 2 for accommodating the ball bearings, thereby adjusting the connection between the fixed cylinder 8 and the drive cylinder 2 to a rolling connection, thus reducing wear. In addition, the focusing structure 100 also includes a connecting plate, which is fixedly connected to the mounting bracket 1 and is provided corresponding to the rear end face of the drive cylinder 2. A second annular groove 24 is formed on the side opposite to the rear end face of the connecting plate and the drive cylinder 2 for accommodating the ball bearings, thereby adjusting the connection between the connecting plate and the side opposite to the rear end face of the drive cylinder 2 to a rolling connection, thus reducing wear.

[0066] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A focusing structure, characterized in that, include: Mounting bracket; A drive cylinder is disposed on the mounting bracket in the front-rear direction and is rotatable along the front-rear axis. At least one drive groove is formed on the peripheral wall of the drive cylinder. The drive groove extends in the front-rear direction, and the front end and the rear end of the drive groove are offset from each other in the circumferential direction of the drive cylinder. The lens barrel is movably installed in the drive cylinder along the front-back direction. At least one connector is fixed to the outer peripheral wall of the lens barrel. The connector is slidably installed in the drive groove. When the drive cylinder rotates relative to the lens barrel, the drive groove drives the connector to move the lens barrel back and forth. as well as, An elastic structure is disposed between the rear end of the lens barrel and the mounting bracket to provide a forward elastic force when the lens barrel moves back and forth.

2. The focusing structure as described in claim 1, characterized in that, The peripheral wall of the lens barrel is provided with a groove corresponding to the drive groove; The connector includes: The first bearing is disposed within the drive slant groove; A pin passes through the inner hole of the first bearing to secure it to the groove of the lens barrel.

3. The focusing structure as described in claim 1, characterized in that, The focusing structure also includes a connecting plate and a cover plate. The connecting plate is fixedly connected to the mounting bracket and is disposed corresponding to the rear end face of the drive cylinder. The cover plate covers the mounting bracket and includes multiple through holes for accommodating the drive cylinder. The elastic structure includes: At least one guide shaft is disposed between the cover plate and the connecting plate in the front-rear direction, and the guide shaft passes through the rear end face of the lens barrel; At least one spring is sleeved on the guide shaft, and the two ends of the spring abut against the front end face of the connecting plate and the rear end face of the lens barrel, respectively, to provide elastic force when the lens barrel moves back and forth.

4. The focusing structure as described in claim 1, characterized in that, The focusing structure also includes a drive motor disposed on the mounting bracket, the drive motor including an output shaft extending in the front-rear direction, and a first gear disposed on the output shaft; The outer peripheral wall of the drive cylinder is provided with an annular rack that meshes with the first gear.

5. The focusing structure as described in claim 4, characterized in that, The focusing structure includes an encoder disposed on the mounting bracket for detecting the rotation angle of the drive cylinder. The encoder includes: The encoder body is fixedly connected to the mounting bracket; An encoder shaft extends in the front-to-back direction, and a second gear that meshes with the annular rack is provided on the encoder shaft; A magnetic grating is disposed on one end of the encoder shaft away from the second gear, and the encoder body covers the magnetic grating. A torsion spring is sleeved on the outside of the encoder shaft. One end of the torsion spring abuts against the mounting bracket in the front-rear direction, and at least part of the other end is disposed in the inner hole of the second gear. It is used to apply a preload force along the circumference of the encoder shaft to the second gear and a preload force along the direction away from the encoder body to the encoder shaft when the annular rack drives the second gear to rotate.

6. The focusing structure as described in claim 1, characterized in that, The focusing structure further includes a fixed cylinder, which is disposed between the driving cylinder and the lens barrel in the front-back direction. The peripheral wall of the fixed cylinder is formed with at least one driving straight groove corresponding to the driving inclined groove, and the driving straight groove extends in the front-back direction. The connector passes through the drive straight groove to slide in conjunction with the drive inclined groove, and slides along the drive straight groove when the drive cylinder rotates relative to the lens barrel.

7. The focusing structure as described in claim 6, characterized in that, The drive straight groove is provided with a second bearing, and the connecting member extends into the drive inclined groove through at least part of the inner hole of the second bearing.

8. The focusing structure as described in claim 6, characterized in that, The front end of the fixed cylinder and the side opposite to the driving cylinder each form a first annular groove for accommodating the balls; and / or, The focusing structure also includes a connecting plate, which is fixedly connected to the mounting bracket and is provided corresponding to the rear end face of the drive cylinder. The connecting plate and the side facing the rear end face of the drive cylinder respectively form a second annular groove for accommodating the ball bearings.

9. The focusing structure as described in claim 6, characterized in that, The rear end face of the fixed cylinder is provided with a threaded hole; The focusing structure includes a connecting screw, including a screw head, the connecting screw passing through the threaded hole and the screw head abutting against the mounting bracket; A first washer is provided between the screw head and the rear end face of the fixing cylinder.

10. The focusing structure as described in claim 6, characterized in that, The peripheral wall of the lens barrel is provided with a groove corresponding to the drive groove. The connecting member includes a first bearing and a pin. The first bearing is disposed in the drive groove, and the pin passes through the inner hole of the first bearing to be fixed to the groove of the lens barrel. A second bearing is provided inside the drive groove; A second shim is provided between the first bearing and the second bearing, and / or between the second bearing and the lens barrel, and / or between the first bearing and the pin head.

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