Lens assembly and monitoring equipment

Abstract

The invention discloses a lens assembly and monitoring equipment. The lens assembly comprises a lens, a detector, a focusing adjusting assembly and a return stroke difference eliminating assembly. The lens comprises a focusing group. The focus adjusting assembly comprises a first adjusting part and a second adjusting part. The first adjusting piece is connected with the focusing group, the lens or the detector, and the first adjusting piece and the second adjusting piece are connected through a reversing mechanism. The return stroke difference eliminating assemblies are evenly distributed in the circumferential direction of the first adjusting piece and comprise elastic pieces. Under the action of the elastic piece, matched parts in the reversing mechanism abut against each other, so that the first adjusting piece moves along the optical axis of the lens under the condition that the second adjusting piece is rotated, and the distance between the focusing group and the detector is adjusted. Matched parts in the reversing mechanism abut against each other through the elastic piece, the second adjusting piece is in a close fit state with the first adjusting piece all the time in the rotating process, the return stroke difference is eliminated, and it is ensured that focusing is clear under all object distances.

Description

Technical Field

[0001] The present application relates to optical equipment, and in particular to lens assemblies and monitoring equipment. Background Art

[0002] The monitoring device 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 is used to adjust the distance between the focus group and the detector along the optical axis of the lens to make the image clear.

[0003] The distance adjustment between the focusing group and the detector is achieved by a reversing mechanism. The reversing mechanism can convert rotational motion into linear motion, thereby adjusting the distance between the focusing group and the detector. In practice, there are assembly tolerances between parts, and the assembly tolerances will lead to return errors. For example, in the case where the adjustment mechanism includes gear meshing, the assembly tolerances will lead to gear meshing tolerances. In other cases, the gears themselves may also have meshing tolerances and lead to return errors. In any case, the return error will lead to unclear focus (the image of the target object appears unclear). Summary of the invention

[0004] The purpose of the present application is to disclose a lens assembly and a monitoring device. The lens assembly can focus clearly.

[0005] In a first aspect, the present 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 adjustment member and the second adjustment member are connected via a reversing mechanism. The backlash elimination assembly is evenly distributed along the circumference of the first adjustment member, and includes an elastic member; under the action of the elastic member, the mating parts in 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 to adjust the distance between the focus group and the detector.

[0006] In some embodiments, the reversing mechanism includes a curved groove provided on one of the first adjusting member and the second adjusting member, and a moving member provided on the other member, and under the action of the elastic member, the moving member abuts against the side wall of the curved groove to achieve the mutual abutment; or, the reversing mechanism includes teeth and a guide mechanism provided between the first adjusting member and the second adjusting member; under the action of the guide mechanism, the first adjusting member moves linearly; the teeth between the first adjusting member and the second adjusting member are tightly engaged under the action of the elastic member to achieve the mutual abutment.

[0007] In some embodiments, the lens assembly includes a light-incoming lens, a function switching group, and a function driving assembly; the light-incoming lens and the function switching group are distributed along the direction from object to image; the function driving assembly includes a rotating member, a switching mechanism, and a connecting member, the switching mechanism is connected to the rotating member and the connecting member; the connecting member is connected to the function switching group; the switching mechanism converts the rotational motion of the rotating member into a 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-incoming 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 assembly, which includes a follower, a feedback member and a fixed member; the fixed member is stationary relative to the lens, and includes a feedback part; the follower rotates around the optical axis under the drive of the functional driving assembly, driving the feedback member to rotate around the optical axis until the feedback member abuts the feedback part.

[0009] In some embodiments, the fixing member is provided with an arc-shaped guide groove; the tactile feedback component includes an elastic member, and the two ends of the elastic member are respectively connected to the follower 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 in different directions along the guide groove to abut against or leave the feedback part.

[0010] In some embodiments, the feedback portion is a slot, and the feedback member is a ball.

[0011] In some embodiments, the backhaul difference elimination component serves as a first backhaul difference elimination component, and the lens assembly includes a second backhaul difference elimination component, the second backhaul difference elimination component is connected to the connector, and the structure of the second backhaul difference elimination component is the same as that of the first backhaul difference elimination component.

[0012] In some embodiments, the lens assembly includes a light-intake lens, a function switching group, and a function driving component, wherein the function driving component 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 includes an aperture, and the aperture includes a switch to control the amount of light entering; 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 gear-type aperture or a continuous aperture, and the amount of light entering corresponds to the driving value one by one; 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 embodiments, the first function is one of a telephoto function, a macro function, and a reverse telephoto function, and the second function is another one of a telephoto function, a macro function, and a reverse telephoto function.

[0015] In a second aspect, the present application discloses a monitoring device, which includes any one of the aforementioned lens assemblies.

[0016] For the lens assembly and the monitoring equipment, since the return difference elimination component is evenly distributed along the circumference of the first adjusting member, the first adjusting member is evenly stressed (if the force is uneven, the focusing group will be tilted, resulting in inability to move, or, although it can move, some parts will be pressed together due to the elastic force of the elastic member and the return difference can be eliminated, while some parts are not pressed together and the return difference cannot be eliminated). Finally, the combination of uniform distribution and elastic member makes the mating parts in the reversing mechanism press against each other according to their respective mating relationships, and then, the second adjusting member is always in a state of close fit with the first adjusting member during rotation. Finally, the return difference is eliminated from the final performance result, and the displacement of the corresponding focusing group, lens or detector driven by the first adjusting member along the optical axis is the same as the required displacement, ensuring clear focus at all object distances. In addition, the return difference is eliminated from the final performance result through the aforementioned abutment, and the return difference of the entire lens assembly is eliminated at one time without having to deal with each tolerance. The return difference elimination component includes an elastic member and the return difference is eliminated through the aforementioned abutment. The overall structure of the return difference elimination component is compact and there is no need to make major changes to the lens assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a lens assembly of the present application;

[0018] Figure 2 yes Figure 1 A magnified view of part A;

[0019] Figure 3 yes Figure 1 A magnified view of part B;

[0020] Figure 4 This is a first schematic diagram of the first adjusting member and the second adjusting member of the lens assembly of the present application cooperating through a reversing mechanism;

[0021] Figure 5 is a schematic diagram of the lens assembly of the present application in a first mode;

[0022] Figure 6 is a schematic diagram of the lens assembly of the present application in a second mode;

[0023] Figure 7 is a schematic diagram of a hand-feel feedback component in a mode adjustment process;

[0024] Figure 8 It is a schematic diagram of the cooperation between the feedback member and the feedback part of the hand-feel feedback assembly of the present application;

[0025] Fig. 9 This is a second schematic diagram of the first adjusting member and the second adjusting member of the lens assembly of the present application being matched through a reversing mechanism. DETAILED DESCRIPTION

[0026] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] If there are terms involving directional indications or positional relationships in the embodiments of the present application (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 relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0028] See also Figure 1 , the present application discloses a lens assembly. The lens assembly includes a lens 1, a detector 2, a focus adjustment assembly 3 and a return difference elimination assembly 4. The lens 1 is not limited and can realize imaging in the visible light band, imaging in the short-wave infrared band, imaging in the medium-wave infrared band or imaging in the long-wave infrared band. In short, according to the band to be imaged, the lens of the lens 1 can be selected with corresponding materials, etc. The lens 1 includes a focus group 11. The focus adjustment assembly 3 includes a first adjustment member 31 and a second adjustment member 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 ways: 1) the focus group 11 moves along the optical axis, and the detector 2 is stationary; 2) the lens 1 moves as a whole so that the focus group 11 moves together, and the detector 2 is stationary; 3) the lens 1 or the focus group 11 is stationary, and the detector 2 moves. Therefore, based on the above three ways, the first adjustment member 31 is connected to the focus group 11, the lens 1 or the detector 2. Figure 1 and Figure 2The diagram shows that the first adjusting member 31 is connected to the focus 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 the 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 focus group 11, the lens 1 or the detector 2 to move along the optical axis L.

[0029] See also Figure 1 , Figure 2 and Figure 4 , the return difference elimination components 4 are evenly distributed along the circumference of the first adjusting member 31, and the circumferential even distribution means that the corresponding components are evenly stressed. For example, when there are two return difference elimination components 4, the return difference elimination components 4 are distributed at 180 degrees; when there are three return difference elimination components 4, the return difference elimination components 4 are distributed at 120 degrees, and so on, when there are four return difference elimination components 4, the return difference elimination components 4 are distributed at 90 degrees. The return difference elimination component 4 includes an elastic member 41. The elastic member 41 is a component that can be deformed, such as a spring, elastic rubber, etc. Under the action of the elastic member 41, the matching components in the reversing mechanism 33 abut against each other, and there is no limit to how they abut against each other. For example, the return difference elimination component 4 includes a stationary member 42. The stationary member 42 can be connected to any component of the lens assembly and is a component that does not move. One end of the elastic member 41 is connected to the stationary member 42, and the other end is connected to the matching component in the reversing mechanism 33, so that under the elastic force of the elastic member 41, one of the matching 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. Accordingly, for the first case mentioned above, the first adjusting member 31 is connected to the focus group 11, driving the focus group 11 to move along the optical axis relative to the detector 2; for the second case mentioned above, the first adjusting member 31 is connected to the lens 1 (for example, the housing of the lens 1), driving the lens 1 to move along the optical axis relative to the detector 2; for the third case mentioned above, the first adjusting member 31 is connected to the detector 2, driving the detector 2 to move along the optical axis relative to the lens 1. Regardless of the above case, the final result of the first adjusting member 31 is to adjust the distance between the focus group and the detector.

[0030] The movement between the first adjusting member 31 and the second adjusting member 32 can be achieved manually (ie, manually adjusting the focus mode) or electrically (ie, electrically adjusting the focus mode).

[0031] The technicians found that the return difference is mainly caused by the superposition of the matching tolerances between the various parts of the whole machine structure. The final manifestation is that in the process of rotating the second adjusting member 32, the relevant parts are not tightly pressed and the force cannot be transmitted well, so that the actual displacement of the driven parts is different from the required displacement. If the matching parts are solved one by one, and the processing accuracy cannot be infinitely tightened, the solution is too complicated. As set up as above, since the return difference elimination component 4 is evenly distributed along the circumference of the first adjusting member 31, the first adjusting member 31 is evenly stressed (if the force is uneven, the focusing group 11 will be tilted, resulting in inability to move, or, although it can move, some parts will be pressed together due to the elastic force of the elastic member and the return difference can be eliminated, while some parts are not pressed together and the return difference cannot be eliminated). Finally, the combination of uniform distribution and the elastic member 41 makes the mating parts in the reversing mechanism 33 press against each other according to their respective mating relationships, and then, the second adjusting member 32 is always in a tight fit with the first adjusting member 31 during rotation. Finally, the return difference is eliminated from the final performance result, and the displacement of the corresponding focusing group 11, lens 1 or detector 2 driven by the first adjusting member 31 along the optical axis is the same as the required displacement, ensuring clear focus at all object distances. In addition, the return difference is eliminated from the final performance result through the aforementioned abutment, and the return difference of the entire lens assembly is eliminated at one time without having to deal with each tolerance. The return difference elimination component 4 includes an elastic member 41 and the return difference is eliminated through the aforementioned abutment. The overall structure of the return difference elimination component 4 is compact and there is no need to make major changes to the lens assembly.

[0032] See also Figure 4 and Figure 3 , the reversing mechanism 33 includes a moving part 331 provided on the first adjusting part 31, and a curved groove 332 (also referred to as a cam groove in the industry) provided on the second adjusting part 32. The structure of the moving part 331 is not limited, and it can be a convex point formed on the first adjusting part 31, or it can be a screw installed on the first adjusting part 31. Under the action of the elastic part 41, the moving part 331 abuts against the side wall of the curved groove 332 to achieve the mutual abutment. In other embodiments, the first adjusting part 31 can also be provided with the curved groove 332, and the second adjusting part 32 can be provided with the moving part 331.

[0033] As set up as 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 arranged on the other one, 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 transmission of the reversing mechanism 33. Through the abutment between the moving member 331 and the curved groove 332, the problem of return difference is solved at one time. The structure for solving the return difference is simple, and there is no need to make major changes to the lens assembly.

[0034] In other embodiments, see Fig. 9 , the reversing mechanism includes teeth 311 and a guide mechanism 34 arranged between the first adjusting member 31 and the second adjusting member 32. That is, the moving member 331 and the curved groove 332 are replaced by gear transmission (transmission between the first adjusting member 31 and the second adjusting member 32 through the teeth 311) and the guide mechanism, and the working principle can be understood with the help of the 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 are closely meshed under the action of the elastic member 41 (this close meshing is understood as the two are in close contact but can move relative to each other) to achieve the mutual abutment.

[0035] As set up above, the first adjusting member 31 and the second adjusting member 32 are meshed with 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 return difference at one time. The structure for solving the return difference is simple and no major changes are required to the lens assembly.

[0036] See also Figure 1 , the lens assembly includes a light-entering lens 13, a function switching group 12 and a function driving assembly 5. Normally, based on the considerations of the sealing of the lens 1 and the like, the light-entering lens 13 does not move. The light-entering lens 13, the function switching group 12, the focusing group 11 and the detector 2 are arranged in sequence along the direction from the object to the image. The function driving assembly 5 is connected to the function switching group 12, and can convert the rotational motion into a linear motion, so that the function switching group 12 moves along the optical axis relative to the light-entering lens 13, and the lens assembly switches between the first function and the second function. The first function and the second function are not limited. In the embodiment of the present application, the first function is one of the telephoto function, the macro function and the anti-telephoto function, and the second function is another of the telephoto function, the macro function and the anti-telephoto function. Comparison Figure 5 and Figure 6 , Figure 5 It indicates that the first function is the telephoto function. Figure 6 The second function is shown as macro function. Figure 5 and Figure 6It can be seen that by adjusting the function switching group 12, switching between the telephoto function and the macro function is achieved. In one embodiment, the structure of the function driving component 5 can be the same as the structure of the aforementioned focus adjustment component 3. For the convenience of distinction, the relevant components of the function driving component 5 are named as: rotating member 51, reversing mechanism 33 and connecting member 52. The connecting member 52 is connected to the function switching group 12. The rotating member 51 and the connecting member 52 cooperate with the moving member 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 the rotational motion into linear motion.

[0037] As described above, the switching between the first function and the second function can be realized quickly and accurately by rotating the rotating member 51 of the function driving assembly 5. In addition, for the lens assembly, in addition to the function driving assembly 5, no other components need to be installed to realize the switching between the first function and the second function in one lens, which does not make the structure of the lens assembly complicated.

[0038] In some embodiments, the function switching group 12 is linked with the focus group, that is, the switching between the first function and the second function can be linked with the movement of the focus group 11 relative to the detector 2. This linkage includes: 1) the function switching group 12 and the focus group 11 move in the same direction; 2) the function switching group 12 and the focus group 11 move in different directions. There is no limit to the movement, for example, by Figure 4 It is understood that the curved grooves of the two are facing the same direction to achieve movement in the same direction, and the curved grooves facing opposite directions to achieve movement in different directions.

[0039] As set above, by linking the function switching group 12 with the focus group 11, the switching between the first function and the second function, as well as the focus function, can be conveniently adjusted.

[0040] See also Figure 1 , Figure 7 and Figure 8 , the lens assembly includes a hand-feel feedback assembly 6. The hand-feel feedback assembly 6 includes a follower 61, a feedback member 62 and a fixed member 63. The fixed member 63 is stationary relative to the lens 1, and includes a feedback portion 631. The follower 61 can be integrally formed with the rotating member 51 in the functional drive assembly 5, or assembled to the rotating member 51. The follower 61 rotates around the optical axis driven by the functional drive assembly 5, so that the follower 61 drives the feedback member 62 to move. The follower 61 rotates around the optical axis L driven by the functional drive assembly 5, driving the feedback member 62 to rotate until the feedback member 62 abuts against the feedback portion 631. Figure 8 The feedback member 62 is shown to be in contact with the feedback portion 631. When in contact, the rotating member 51 cannot continue to rotate.

[0041] As described above, by the feedback member 62 abutting against the feedback portion 631 to realize hand-feel feedback, the user can accurately know the moving distance of the function switching group 12, which is convenient for use.

[0042] The function switching group 12 can also realize focusing (or zooming) by moving different distances along the optical axis L. At this time, the first function is the function before focusing (or zooming), and the second function is the function after focusing (or zooming).

[0043] In order to ensure that no debris is generated and the durability of the mechanism, the feedback member 62 and the feedback portion 631 must be a combination of soft and hard materials, including but not limited to plastic and metal, copper and stainless steel.

[0044] See also Figure 4 , Figure 7 and Figure 8 For the hand-feel feedback assembly 6, the fixing member 63 is provided with a circular arc-shaped guide groove 632. Figure 8 In the figure, the guide groove 632 is a circle or may not be a circle. The hand-feel feedback component 6 includes an elastic member 64. The elastic member 64 is a deformable member, such as a spring, elastic rubber, etc. The two ends of the elastic member 64 are respectively connected to the follower 61 and the feedback member 62; under the elastic force of the elastic member 64, the feedback member 62 is located in the guide groove 632. The feedback member 62 moves in different directions along the guide groove 632 to abut against or leave the feedback portion.

[0045] As described above, by setting the guide groove 632, the guide groove 632 guides the movement of the feedback member 62, and in combination with the elastic force of the elastic member 64, the feedback member 62 is pressed against the guide groove 632, thereby, the movement of the feedback member 62 is smooth, and the structure of the hand feel feedback component 6 is also simple and miniaturized.

[0046] See also Figure 7 and Figure 8 The feedback part 631 is a slot. The slot can be a square slot or a spherical slot. The feedback member 62 is a ball.

[0047] As described above, when the ball enters the slot, a clicking sound is emitted, and the user can more easily judge that the function switching group 12 has been adjusted to the right position based on the clicking sound. In addition, the ball cooperates with the slot, which makes it easier for the ball to enter or exit the slot, and the hand feeling feedback is better. Finally, compared with the way that the feedback member 62 abuts against the feedback portion 631, the way that the ball cooperates with the slot makes a louder clicking sound and a better hand feeling.

[0048] Based on the enlightenment of eliminating the back-stroke difference, the back-stroke difference elimination component can also be used in adjusting the distance between the function switching group 12 and the light-incoming lens 13 (the first function and the second function). This embodiment is described as follows: the back-stroke difference elimination component used to eliminate the focus adjustment component is used as the first back-stroke difference elimination component. Figure 1 The lens assembly further includes a second back-stroke difference elimination component 40. The second back-stroke difference elimination component 40 is connected to the connecting member 52. The structure of the second back-stroke difference elimination component 40 is the same as that of the first back-stroke difference elimination component, and the working process is also the same as the above, which will not be repeated.

[0049] As described above, by providing the second return difference elimination component 40, the position of the function switching group 12 after movement is accurate.

[0050] See also Figure 1 The lens assembly includes an aperture 14, and the aperture 14 includes a switch 141 for controlling the amount of light entering. The switch may be a button, or a sensor, etc. The function switching group 12 moves along the optical axis L to trigger the switch 141. Thus, the amount of light entering the aperture 14 is controlled, and the linkage between the function switching group 12 and the aperture 14 is realized.

[0051] As set above, the function switching group 12 triggers the diaphragm 14 so that the function switching group 12 is linked with the diaphragm 14 to control the amount of light entering the diaphragm 14 (adjust the aperture or adjust the diaphragm). There is no need to adjust the diaphragm additionally to meet the amount of light entering after the function switching group 12 adjusts its position, and the operation is simple. In addition, compared with the diaphragm being an independent system, it can avoid the problem of not forgetting to adjust the amount of light entering after adjusting the function switching group 12, resulting in damage to the detector 2 or poor imaging effect. For example, although the detector will estimate the maximum light intensity, the use scenario of the lens assembly is changing, and the actual light intensity may be greater than the estimated light intensity. At this time, if you forget to adjust the amount of light entering, it will cause damage to the detector. The aforementioned function switching group 12 is linked with the diaphragm 14, and the diaphragm 14 will not be adjusted.

[0052] The aperture 14 is a gear-type aperture or a continuous aperture. The amount of light entering corresponds to the driving value one-to-one. For example, for the gear-type aperture, the gear, the amount of light entering and the driving value correspond one-to-one. For example, the function switching group 12 triggers the switch 141 to open, and does not trigger the switch 141 to close. 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. The pressure value corresponds to the amount of light entering. The aperture 14 opens different aperture diameters according to the pressure value to control the amount of light entering. Alternatively, the driving value generating component can generate different current values ​​according to the movement of the function switching group 12 to different distances. The current value corresponds to the amount of light entering.

[0053] In order to facilitate control and to more conveniently control the amount of light entering, the adjustment mode of the aperture 14 is the same as the mode of the function switching group 12 trigger switch 141, for example, both are gear type, or both are continuous (the function switching group 12 moves continuously, and the amount of light entering keeps changing)

[0054] On the other hand, the present application discloses a monitoring device, which includes any one of the aforementioned lens assemblies.

[0055] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A lens assembly, characterized in that: The lens assembly includes a lens, a detector, a focus adjustment assembly and a return difference 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 adjustment member and the second adjustment member are connected via a reversing mechanism; The backlash difference elimination component is evenly distributed along the circumference of the first adjusting member, and includes an elastic member; under the action of the elastic member, the matching parts in the reversing mechanism abut against each other, so that when the second adjusting member is rotated, the first adjusting member moves along the optical axis of the lens to adjust the distance between the focusing group and the detector.

2. The lens assembly according to claim 1, characterized in that: The reversing mechanism comprises a curved groove provided on one of the first adjusting member and the second adjusting member, and a moving member provided on the other one, and 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 and a guide mechanism arranged between the first adjusting member and the second adjusting member; under the action of the guide mechanism, the first adjusting member moves linearly; under the action of the elastic member, the teeth between the first adjusting member and the second adjusting member are tightly engaged to achieve the mutual abutment.

3. The lens assembly according to claim 1, characterized in that: The lens assembly includes a light-intake lens, a function switching group and a function driving component; the light-intake lens and the function switching group are distributed along the direction from object to image; The function driving component includes a rotating part, a reversing mechanism and a connecting part, the reversing mechanism is connected to the rotating part and the connecting part; the connecting part is connected to the function switching group; the reversing mechanism converts the rotational motion of the rotating part into the linear motion of the connecting part to drive the function switching group to move along the optical axis of the lens relative to the light-entering lens, and the lens assembly switches between the first function and the second function.

4. The lens assembly according to claim 3, characterized in that: The lens assembly includes a hand-feel feedback assembly, which includes a follower, a feedback member and a fixed member; the fixed member is stationary relative to the lens, and includes a feedback part; the follower rotates around the optical axis under the drive of the functional driving assembly, driving the feedback member to rotate around the optical axis until the feedback member abuts against the feedback part.

5. The lens assembly according to claim 4, characterized in that: The fixing member is provided with a guide groove in an arc shape; the hand feeling feedback component comprises an elastic member, and two ends of the elastic member 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 the feedback portion or leave the feedback portion.

6. The lens assembly according to claim 5, characterized in that: The feedback portion is a slot, and the feedback member is a ball.

7. The lens assembly according to claim 3, characterized in that: The back-stroke difference elimination component serves as a first back-stroke difference elimination component, and the lens component includes a second back-stroke difference elimination component, which is connected to the connecting member, and the structure of the second back-stroke difference elimination component is the same as that of the first back-stroke difference elimination component.

8. The lens assembly according to claim 1, characterized in that: The lens assembly includes a light-intake lens, a function switching group and a function driving assembly, wherein 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 includes an aperture, and the aperture includes a switch for controlling the amount of incoming light; the function switching group moves along the optical axis with the function switching group to trigger the switch.

9. The lens assembly according to claim 8, characterized in that: The aperture is a gear-type aperture or a continuous aperture, and the amount of light entering corresponds to the driving value one by one; 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.

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 an anti-telephoto function, and the second function is another one of the telephoto function, the macro function and the anti-telephoto function.

11. A monitoring device, characterized in that: The monitoring device comprises the lens assembly according to any one of claims 1 to 10.

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