Lens assembly and monitoring equipment
By introducing a backlash elimination component into the lens assembly, and utilizing elastic elements and a reversing mechanism to achieve uniform force on the components, the problem of unclear focus caused by assembly tolerances is solved, and the lens assembly achieves a clear focus effect across the entire focal length.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-17
AI Technical Summary
In existing lens assemblies, backlash caused by assembly tolerances leads to unclear focus, and existing technologies are unable to effectively eliminate this problem.
A backlash elimination component is adopted. Through the elastic elements and reversing mechanism that are evenly distributed around the first adjusting component, the force on each component is uniform, and a tight fit is achieved to eliminate backlash.
It effectively eliminates backlash, ensures accurate distance adjustment between the focusing group and the detector, achieves full-focus clarity, has a simple structure, and requires no major modifications to the lens assembly.
Smart Images
Figure CN224005340U_ABST
Abstract
Description
Technical Field
[0001] This application relates to optical equipment, and more particularly to lens assemblies and monitoring equipment. Background Technology
[0002] The monitoring equipment includes a lens assembly. The lens assembly includes a lens, a detector, and a focus adjustment assembly. The lens includes a focus group. The focus adjustment assembly adjusts the distance between the focus group and the detector along the optical axis of the lens to achieve a clear image.
[0003] The distance adjustment between the focusing group and the detector is achieved through a reversing mechanism. This mechanism converts rotational motion into linear motion, thereby adjusting the distance between the focusing group and the detector. In practice, assembly tolerances exist between components, which can lead to backlash. For example, in cases where the adjustment mechanism involves gear meshing, assembly tolerances can result in gear meshing tolerances. In other cases, the gears themselves may also exhibit meshing tolerances, causing backlash. Regardless of the situation, backlash leads to blurry focus (the image of the target object appears unclear). Utility Model Content
[0004] The purpose of this application is to disclose a lens assembly and a monitoring device. The lens assembly is capable of focusing clearly.
[0005] In a first aspect, this application discloses a lens assembly. The lens assembly includes a lens, a detector, a focus adjustment assembly, and a backlash elimination assembly; the lens includes a focus group. The focus adjustment assembly includes a first adjustment member and a second adjustment member; the first adjustment member is connected to the focus group, the lens, or the detector, and the first and second adjustment members are connected via a reversing mechanism. The backlash elimination assembly is uniformly distributed along the circumference of the first adjustment member and includes an elastic member; under the action of the elastic member, cooperating components within the reversing mechanism abut against each other, so that when the second adjustment member is rotated, the first adjustment member moves along the optical axis of the lens, adjusting the distance between the focus group and the detector.
[0006] In some embodiments, the reversing mechanism includes a curved groove disposed on one of the first adjusting member and the second adjusting member, and a moving member disposed on the other. Under the action of the elastic member, the moving member abuts against the side wall of the curved groove to achieve the mutual abutment. Alternatively, the reversing mechanism includes teeth disposed between the first adjusting member and the second adjusting member, and a guiding mechanism. Under the action of the guiding mechanism, the first adjusting member moves linearly. The teeth between the first adjusting member and the second adjusting member mesh tightly under the action of the elastic member to achieve the mutual abutment.
[0007] In some embodiments, the lens assembly includes an incoming light lens, a function switching group, and a function driving assembly; the incoming light lens and the function switching group are distributed along the object-to-image direction; the function driving assembly includes a rotating member, a reversing mechanism, and a connecting member, the reversing mechanism being connected to the rotating member and the connecting member; the connecting member being connected to the function switching group; the reversing mechanism converts the rotational motion of the rotating member into the linear motion of the connecting member, thereby driving the function switching group to move relative to the incoming light lens along the optical axis of the lens, and the lens assembly switches between a first function and a second function.
[0008] In some embodiments, the lens assembly includes a tactile feedback component, which includes a follower, a feedback element, and a fixing element; the fixing element is stationary relative to the lens and includes a feedback portion; the follower rotates around the optical axis under the drive of the functional drive component, causing the feedback element to rotate around the optical axis until the feedback element abuts against the feedback portion.
[0009] In some embodiments, the fixing member is provided with an arc-shaped guide groove; the tactile feedback component includes an elastic member, the two ends of which are respectively connected to the driven member and the feedback member; under the elastic force of the elastic member, the feedback member is located in the guide groove; the feedback member moves along the guide groove in different directions to abut against or move away from the feedback part.
[0010] In some embodiments, the feedback unit is a slot, and the feedback element is a ball bearing.
[0011] In some embodiments, the backlash elimination component is a first backlash elimination component, the lens assembly includes a second backlash elimination component, the second backlash elimination component is connected to the connector, and the structure of the second backlash elimination component is the same as that of the first backlash elimination component.
[0012] In some embodiments, the lens assembly includes an intake lens, a function switching group, and a function driving component, the function driving component driving the function switching group to move along the optical axis of the lens to switch between a first function and a second function. The lens assembly includes an aperture stop, the aperture stop including a switch for controlling the amount of light entering the lens; the function switching group moves along the optical axis with the function switching group to trigger the switch.
[0013] In some embodiments, the aperture is a tiered aperture or a continuous aperture, and the amount of light received corresponds one-to-one with the driving value; the aperture includes a driving value generating component; the function switching group moves different distances to trigger the driving value generating component to generate different driving values.
[0014] In some implementations, the first function is one of a telephoto function, a macro function, and an anti-telephoto function, and the second function is another of a telephoto function, a macro function, and an anti-telephoto function.
[0015] Secondly, this application discloses a monitoring device. The monitoring device includes any of the aforementioned lens assemblies.
[0016] For the lens assembly and the monitoring device, the backlash elimination component is evenly distributed along the circumference of the first adjustment member, resulting in uniform force on the first adjustment member (if the force is uneven, the focus group will tilt, making it unable to move; or, although it can move, some parts will be pressed together by the elastic force of the elastic element to eliminate the backlash, while some parts will not be pressed together and cannot eliminate the backlash). Ultimately, the combination of uniform distribution and elastic element ensures that the cooperating parts in the reversing mechanism are pressed together according to their respective cooperation relationships. Consequently, the second adjustment member is always in a close cooperation with the first adjustment member during rotation. Ultimately, the backlash is eliminated in the final performance result. The displacement of the first adjustment member driving the corresponding focus group, lens, or detector along the optical axis is the same as the required displacement, ensuring clear focus at all object distances. Furthermore, the backlash is eliminated from the final performance result through the aforementioned contact, eliminating the backlash of the entire lens assembly at once without having to deal with each tolerance. Moreover, the backlash elimination component includes an elastic element and achieves backlash elimination through the aforementioned contact. The overall structure of the backlash elimination component is compact and does not require major modifications to the lens assembly. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of a lens assembly according to this application;
[0018] Figure 2 yes Figure 1 Enlarged view of section A;
[0019] Figure 3 yes Figure 1 Enlarged view of section B;
[0020] Figure 4 This is a first schematic diagram of the first and second adjusting members of the lens assembly of this application cooperating through a reversing mechanism;
[0021] Figure 5 This is a schematic diagram of the lens assembly of this application in the first mode;
[0022] Figure 6 This is a schematic diagram of the lens assembly of this application in the second mode;
[0023] Figure 7 This is a schematic diagram of the tactile feedback component used in the mode adjustment process;
[0024] Figure 8 This is a schematic diagram of the feedback element and feedback section of the tactile feedback component of this application in cooperation;
[0025] Figure 9 This is a second schematic diagram of the first and second adjusting members of the lens assembly of this application cooperating through a reversing mechanism. Detailed Implementation
[0026] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0027] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.
[0028] See Figure 1 This application discloses a lens assembly. The lens assembly includes a lens 1, a detector 2, a focus adjustment component 3, and a backlash elimination component 4. The lens 1 is not limited and can realize imaging in the visible light band, short-wave infrared band, mid-wave infrared band, or long-wave infrared band. In short, the appropriate material for the lens 1 can be selected according to the required imaging band. The lens 1 includes a focus group 11. The focus adjustment component 3 includes a first adjustment element 31 and a second adjustment element 32. Adjusting the distance between the focus group 11 and the detector 2 along the optical axis L of the lens 1 includes the following three methods: 1) the focus group 11 moves along the optical axis, and the detector 2 remains stationary; 2) the entire lens 1 moves so that the focus group 11 moves together, and the detector 2 remains stationary; 3) the lens 1 or the focus group 11 remains stationary, and the detector 2 moves. Therefore, based on the above three methods, the first adjustment element 31 is connected to the focus group 11, the lens 1, or the detector 2. Figure 1 and Figure 2The diagram illustrates the connection between the first adjusting member 31 and the focusing group 11. The first adjusting member 31 and the second adjusting member 32 are connected via a reversing mechanism 33. The reversing mechanism 33 converts the rotational motion of the second adjusting member 32 into linear motion of the first adjusting member 31 along the optical axis L of the lens 1. Thus, the first adjusting member 31 can drive the corresponding focusing group 11, lens 1, or detector 2 to move along the optical axis L.
[0029] See Figure 1 , Figure 2 and Figure 4 The backlash correction components 4 are evenly distributed circumferentially along the first adjusting member 31. This even circumferential distribution means that the corresponding components are subjected to uniform force. For example, when there are two backlash correction components 4, they are distributed at 180 degrees; when there are three, they are distributed at 120 degrees, and so on. When there are four, they are distributed at 90 degrees. Each backlash correction component 4 includes an elastic element 41. The elastic element 41 is a deformable component, such as a spring or elastic rubber. Under the action of the elastic element 41, the cooperating components within the reversing mechanism 33 abut against each other. The method of abutting is not limited; for example, the backlash correction component 4 includes a stationary element 42. The stationary element 42 can be connected to any component of the lens assembly and is a non-moving component. One end of the elastic member 41 is connected to the stationary member 42, and the other end is connected to a cooperating component within the reversing mechanism 33. Thus, under the elastic force of the elastic member 41, one of the cooperating components abuts against the other. After abutting, when the second adjusting member 32 is rotated, the first adjusting member 31 moves linearly along the optical axis of the lens 1. Correspondingly, in the first case described above, the first adjusting member 31 is connected to the focusing group 11, causing the focusing group 11 to move relative to the detector 2 along the optical axis; in the second case described above, the first adjusting member 31 is connected to the lens 1 (e.g., the housing of the lens 1), causing the lens 1 to move relative to the detector 2 along the optical axis; in the third case described above, the first adjusting member 31 is connected to the detector 2, causing the detector 2 to move relative to the lens 1 along the optical axis. Regardless of the specific case, the ultimate result of the first adjusting member 31 is to adjust the distance between the focusing group and the detector.
[0030] The movement between the first adjusting member 31 and the second adjusting member 32 can be achieved manually (i.e., manually adjusting the focusing mode) or electrically (i.e., electrically adjusting the focusing mode).
[0031] Technicians discovered that the backlash error was mainly caused by the cumulative tolerances between various parts of the machine structure. This manifested as a misalignment of related components during the rotation of the second adjusting component 32, preventing proper force transmission and resulting in a discrepancy between the actual and required displacement of the driven parts. Addressing each component individually, coupled with the limitation of infinitely tightening machining precision, would make the proposed solution overly complex. As described above, the backlash elimination component 4 is evenly distributed along the circumference of the first adjusting member 31, resulting in uniform force on the first adjusting member 31 (if the force is uneven, the focusing group 11 will tilt, making it unable to move; or, although it can move, some components will be pressed together by the elastic force of the elastic member, thus eliminating the backlash, while some components will not be pressed together and cannot eliminate the backlash). Ultimately, the combination of uniform distribution and elastic member 41 ensures that the components cooperating in the reversing mechanism 33 are pressed together according to their respective cooperation relationships. Consequently, the second adjusting member 32 is always in a close cooperation with the first adjusting member 31 during rotation. Ultimately, the backlash is eliminated in the final result. The displacement of the first adjusting member 31 driving the corresponding focusing group 11, lens 1, or detector 2 along the optical axis is the same as the required displacement, ensuring clear focus at all object distances. Furthermore, the backlash is eliminated from the final performance result through the aforementioned contact, eliminating the backlash of the entire lens assembly at once without having to deal with each tolerance. The backlash elimination component 4 includes an elastic element 41 and achieves backlash elimination through the aforementioned contact. The overall structure of the backlash elimination component 4 is compact and does not require major modifications to the lens assembly.
[0032] See Figure 4 and Figure 3 The reversing mechanism 33 includes a moving member 331 disposed on the first adjusting member 31 and a curved groove 332 (also known in the industry as a CAM groove) disposed on the second adjusting member 32. The structure of the moving member 331 is not limited; it can be a protrusion formed on the first adjusting member 31 or a screw mounted on the first adjusting member 31. Under the action of the elastic member 41, the moving member 331 abuts against the sidewall of the curved groove 332 to achieve the mutual abutment. In other embodiments, the first adjusting member 31 may be provided with the curved groove 332, and the second adjusting member 32 may be provided with the moving member 331.
[0033] As described above, due to the curved groove 332 of one of the first adjusting member 31 and the second adjusting member 32, and the moving member 331 disposed on the other, the first adjusting member 31 drives the corresponding focusing module 11, lens 1 or detector 2 to move. Therefore, the cooperation between the moving member 331 and the curved groove 332 is the last stage of transmission of the reversing mechanism 33. By the contact between the moving member 331 and the curved groove 332, the problem of backlash is solved in one go. The structure for solving backlash is simple and does not require major modifications to the lens assembly.
[0034] In other implementations, see Figure 9 The reversing mechanism includes teeth 311 disposed between the first adjusting member 31 and the second adjusting member 32, and a guide mechanism 34. That is, the moving member 331 and the curved groove 332 are replaced with gear transmission (transmission between the first adjusting member 31 and the second adjusting member 32 via teeth 311) and a guide mechanism; the working principle can be understood using the analogy of a lead screw transmission. Under the action of the guide mechanism 33, the first adjusting member 31 moves linearly. The teeth 311 between the first adjusting member 31 and the second adjusting member 32 mesh tightly under the action of the elastic member 41 (this tight meshing is understood as the two being in close contact but able to move relative to each other) to achieve the mutual abutment.
[0035] As described above, the first adjusting member 31 and the second adjusting member 32 are connected by teeth and cooperate with the guide mechanism, which is the last stage of transmission. The teeth 311 abut against each other, which solves the problem of backlash in one go. The structure for solving backlash is simple and does not require major modifications to the lens assembly.
[0036] See Figure 1 The lens assembly includes an intake lens 13, a function switching group 12, and a function drive assembly 5. Normally, due to considerations such as lens sealing, the intake lens 13 remains stationary. The intake lens 13, function switching group 12, focusing group 11, and detector 2 are arranged sequentially along the object-to-image direction. The function drive assembly 5 is connected to the function switching group 12 and can convert rotational motion into linear motion, causing the function switching group 12 to move relative to the intake lens 13 along the optical axis, allowing the lens assembly to switch between a first function and a second function. The first and second functions are not limited; in the embodiments of this application, the first function is one of a telephoto function, a macro function, and a reverse telephoto function, and the second function is another of a telephoto function, a macro function, and a reverse telephoto function. Figure 5 and Figure 6 , Figure 5 The primary function is indicated as a telescope. Figure 6 The second function is indicated as a macro function, for comparison. Figure 5 and Figure 6It can be seen that switching between telephoto and macro functions is achieved by adjusting the function switching group 12. In one embodiment, the structure of the function driving component 5 can be the same as that of the aforementioned focusing adjustment component 3. For ease of distinction, the relevant components of the function driving component 5 are named as follows: rotating component 51, reversing mechanism 33, and connecting component 52. The connecting component 52 is connected to the function switching group 12. The rotating component 51 and the connecting component 52 cooperate with the moving component 331 (reversing mechanism 33) through the curved groove 332. The function driving component 5 can also adopt other structures, as long as it can convert rotational motion into linear motion.
[0037] As described above, switching between the first and second functions can be achieved quickly and accurately simply by rotating the rotating component 51 of the function drive assembly 5. Furthermore, for the lens assembly, no other components besides the function drive assembly 5 are required to achieve the switching between the first and second functions within a single lens, thus avoiding structural complexity.
[0038] In some implementations, the function switching group 12 is linked to the focusing group; that is, the switching between the first and second functions can be linked to the movement of the focusing group 11 relative to the detector 2. This linkage includes: (i) the function switching group 12 and the focusing group 11 moving in the same direction; and (ii) the function switching group 12 and the focusing group 11 moving in different directions. The method of movement is not limited; for example, by means of… Figure 4 To understand, both types of curved grooves moving in the same direction achieve movement in the same direction, while curved grooves moving in opposite directions achieve movement in different directions.
[0039] As set up above, by linking function switching group 12 with focus group 11, the switching between the first and second functions, as well as the focus function, can be easily adjusted.
[0040] See Figure 1 , Figure 7 and Figure 8 The lens assembly includes a tactile feedback component 6. The tactile feedback component 6 includes a follower 61, a feedback component 62, and a fixing component 63. The fixing component 63 is stationary relative to the lens 1 and includes a feedback portion 631. The follower 61 can be integrally formed with or assembled to the rotating component 51 in the functional drive assembly 5. The follower 61 rotates around the optical axis under the drive of the functional drive assembly 5, thus driving the feedback component 62 to move. The follower 61 rotates around the optical axis L under the drive of the functional drive assembly 5, driving the feedback component 62 to rotate until the feedback component 62 abuts against the feedback portion 631. Figure 8 The diagram illustrates the contact between the feedback element 62 and the feedback unit 631. Upon contact, the rotating element 51 can no longer rotate.
[0041] As described above, tactile feedback is achieved by the feedback element 62 abutting against the feedback section 631, allowing the user to accurately know the moving distance of the function switching group 12, which is convenient for use.
[0042] The aforementioned function switching group 12 can move different distances along the optical axis L to achieve focusing (or zooming). In this case, the first function is the function before focusing (or zooming), and the second function is the function after focusing (or zooming).
[0043] To ensure no debris generation and the durability of the mechanism, the feedback element 62 and the feedback section 631 must be made of a combination of soft and hard materials, including but not limited to plastic with metal, or copper with stainless steel.
[0044] See Figure 4 , Figure 7 and Figure 8 For the tactile feedback component 6, the fixing member 63 is provided with an arc-shaped guide groove 632. Figure 8 In this configuration, the guide groove 632 may or may not be a single circle. The tactile feedback component 6 includes an elastic element 64. The elastic element 64 is a deformable component, such as a spring or elastic rubber. Both ends of the elastic element 64 are connected to the driven element 61 and the feedback element 62, respectively. Under the elastic force of the elastic element 64, the feedback element 62 is positioned within the guide groove 632. The feedback element 62 moves along the guide groove 632 in different directions to contact or move away from the feedback element.
[0045] As described above, by setting the guide groove 632, the guide groove 632 guides the movement of the feedback member 62. Combined with the elastic force of the elastic member 64, the feedback member 62 is pressed against the guide groove 632. As a result, the movement of the feedback member 62 is smooth, and the structure of the tactile feedback component 6 is simple and miniaturized.
[0046] See Figure 7 and Figure 8 The feedback unit 631 is a slot. The slot can be a square slot or a spherical slot. The feedback element 62 is a ball bearing.
[0047] As described above, the ball bearing makes a clicking sound when it enters the slot. This clicking sound allows the user to more easily determine that function switching group 12 has been adjusted correctly. Furthermore, the cooperation between the ball bearing and the slot makes it easier for the ball bearing to enter or exit the slot, resulting in better tactile feedback. Finally, compared to the method where the feedback element 62 and the feedback section 631 abut against each other, the clicking sound is louder and the tactile feedback is better.
[0048] Based on the aforementioned inspiration for eliminating backlash, the backlash elimination component can also be used in the adjustment of the distance between the function switching group 12 and the light-gathering lens 13 (the aforementioned first and second functions). This implementation is described as follows: the aforementioned backlash elimination component used to eliminate the backlash of the focus adjustment component is used as the first backlash elimination component. See [link to documentation]. Figure 1 The lens assembly further includes a second backlash correction component 40. The second backlash correction component 40 is connected to the connector 52. The structure of the second backlash correction component 40 is the same as that of the first backlash correction component, and its operation is also the same as described above, so it will not be repeated here.
[0049] As described above, by setting the second return difference elimination component 40, the position of the function switching group 12 after movement is accurate.
[0050] See Figure 1 The lens assembly includes an aperture stop 14, which includes a switch 141 for controlling the amount of light entering the lens. The switch can be a button or a sensor, etc. The function switching group 12 moves along the optical axis L to trigger the switch 141. This controls the amount of light entering the aperture stop 14, achieving linkage between the function switching group 12 and the aperture stop 14.
[0051] As described above, the function switching group 12 triggers the aperture 14, causing the function switching group 12 and the aperture 14 to be linked, thereby controlling the amount of light entering the aperture 14 (adjusting the aperture or the aperture). This eliminates the need for additional adjustment of the aperture to meet the light intake requirements after the function switching group 12 is adjusted, simplifying operation. Furthermore, compared to having the aperture as an independent system, this avoids the problem of forgetting to adjust the light intake after adjusting the function switching group 12, which could lead to damage to the detector 2 or poor imaging results. For example, although the detector estimates the maximum light intensity, the lens assembly's usage scenario varies, and the actual light intensity may exceed the estimated light intensity. In such cases, forgetting to adjust the light intake could damage the detector. However, the linkage between the function switching group 12 and the aperture 14 prevents the situation where the aperture 14 is not adjusted.
[0052] The aperture 14 can be a stepped aperture or a continuous aperture. The amount of light received corresponds one-to-one with the driving value. For example, for a stepped aperture, the stepped position, the amount of light received, and the driving value correspond one-to-one. For instance, the function switching group 12 triggers switch 141 to open, and closes it if switch 141 is not triggered. The aperture 14 includes a driving value generating component. The function switching group 12 moves different distances to trigger the driving value generating component to generate different driving values. For example, the driving value generating component is a pressure sensor; the function switching group 12 moves different distances to generate different pressure values, and the pressure values correspond one-to-one with the amount of light received. The aperture 14 opens different aperture diameters according to the pressure value, thereby controlling the amount of light received. Alternatively, the driving value generating component can generate different current values according to the function switching group 12 moving different distances, and the current values correspond one-to-one with the amount of light received.
[0053] For ease of control, and even more so for easier control of the amount of light entering the camera, the adjustment mode of the aperture 14 is the same as that of the trigger switch 141 of the function switching group 12. For example, both are level-type, or both are continuous (the function switching group 12 moves continuously, and the amount of light entering the camera changes continuously).
[0054] On the other hand, this application discloses a monitoring device. The monitoring device includes any of the aforementioned lens assemblies.
[0055] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A lens assembly, characterized by, The lens assembly comprises a lens, a detector, a focusing adjustment assembly and a return difference elimination assembly; the lens comprises a focusing group; The focusing adjustment assembly comprises a first adjustment member and a second adjustment member; the first adjustment member is connected with the focusing group, the lens or the detector; the first adjustment member and the second adjustment member are connected through a reversing mechanism; The return difference elimination assembly is uniformly distributed along the circumference of the first adjustment member and comprises an elastic member; under the action of the elastic member, components matched in the reversing mechanism abut against each other, so that the first adjustment member moves along the optical axis of the lens under the condition that the second adjustment member is rotated, and the distance between the focusing group and the detector is adjusted.
2. The lens assembly of claim 1, wherein, The reversing mechanism comprises a curved slot arranged in one of the first adjustment member and the second adjustment member, and a moving member arranged in the other one; under the action of the elastic member, the moving member abuts against the sidewall of the curved slot to realize the mutual abutment; Alternatively, the reversing mechanism comprises a tooth arranged between the first adjustment member and the second adjustment member and a guide mechanism; under the action of the guide mechanism, the first adjustment member moves linearly; the tooth between the first adjustment member and the second adjustment member is closely meshed under the action of the elastic member to realize the mutual abutment.
3. The lens assembly of claim 1, wherein, The lens assembly comprises a light-in lens, a function switching group and a function driving assembly; the light-in lens and the function switching group are distributed in the object-to-image direction; The function driving assembly comprises a rotating member, a reversing mechanism and a connecting member; the reversing mechanism is connected with the rotating member and the connecting member; the connecting member is connected with the function switching group; the reversing mechanism converts the rotary motion of the rotating member into the linear motion of the connecting member to drive the function switching group to move along the optical axis of the lens relative to the light-in lens, and the lens assembly is switched between a first function and a second function.
4. The lens assembly of claim 3, wherein, The lens assembly comprises a hand feeling feedback assembly; the hand feeling feedback assembly comprises a driven member, a feedback member and a fixing member; the fixing member is stationary relative to the lens and comprises a feedback part; the driven member is rotated around the optical axis under the driving of the function driving assembly, and drives the feedback member to rotate around the optical axis until the feedback member abuts against the feedback part.
5. The lens assembly of claim 4, wherein, The fixing member is provided with a circular-arc-shaped guide groove; the hand feeling feedback assembly comprises an elastic member; the two ends of the elastic member are connected with the driven member and the feedback member respectively; Under the elastic force of the elastic member, the feedback member is located in the guide groove; the feedback member moves in different directions along the guide groove to abut against or move away from the feedback part.
6. The lens assembly of claim 5, wherein, The feedback part is a clamping groove, and the feedback member is a ball.
7. The lens assembly of claim 3, wherein, The return difference elimination assembly is a first return difference elimination assembly; the lens assembly comprises a second return difference elimination assembly; the second return difference elimination assembly is connected with the connecting member; the structure of the second return difference elimination assembly is the same as that of the first return difference elimination assembly.
8. The lens assembly of claim 1, wherein, The lens assembly comprises a light-in lens, a function switching group and a function driving assembly, the function driving assembly drives the function switching group to move along the optical axis of the lens to switch between a first function and a second function; The lens assembly comprises a diaphragm, the diaphragm comprises a switch to control the amount of light; the function switching group triggers the switch when the function switching group moves along the optical axis.
9. The lens assembly according to claim 8, wherein, The diaphragm is a step diaphragm or a continuous diaphragm, the amount of light corresponds to a driving value one by one; the diaphragm comprises a driving value generating assembly; the function switching group moves different distances to trigger the driving value generating assembly to generate different driving values.
10. The lens assembly according to claim 3 or 8, characterized in that, The first function is one of a telephoto function, a macro function and a reverse telephoto function, and the second function is another of the telephoto function, the macro function and the reverse telephoto function.
11. A monitoring device, characterized by The monitoring device comprises the lens assembly of any one of claims 1 to 10.