Lens assembly, lens, and image pickup apparatus

Abstract

The utility model discloses a lens assembly, a lens and an image pickup device. The lens assembly comprises a skeleton, a focusing group and a driving mechanism. The focusing group comprises a lens group frame, and a focusing lens and an elastic clamping piece which are arranged on the lens group frame; the lens group frame is arranged in the skeleton in a sliding manner along the axial direction of the optical system; the driving mechanism comprises an installation support, a piezoelectric actuator and a friction rod, the piezoelectric actuator and the friction rod are arranged on the installation support, the installation support is arranged on the side wall of the framework, the piezoelectric actuator and the friction rod are adhered in the axial direction of the optical system, and the friction rod is clamped on the elastic clamping piece. According to the technical scheme, the piezoelectric actuator is adopted as a power source, the focusing set is driven to move in the framework in the axial direction of the optical system based on the piezoelectric stick-slip driving principle to achieve the focusing purpose, the design size of the driving mechanism can be effectively reduced, the size of the lens is further reduced, and the focusing speed of the lens is increased.

Description

Technical Field

[0001] This application relates to the field of photography technology, and in particular to a lens assembly, lens, and image pickup device. Background Technology

[0002] With the continuous advancement and popularization of photography technology, consumers' demands for photographic equipment are also increasing, especially regarding the image quality of camera lenses. High definition, low distortion, and rich color reproduction have become important indicators for evaluating lens quality. To meet this market demand, optoelectronic companies are increasing their R&D investment, focusing on innovation and improvement of optical design, aiming to enhance image quality while also satisfying users' needs for lens portability and ease of use.

[0003] In terms of focusing systems, fast and accurate focusing capabilities have become one of the key features of modern photographic lenses. Especially when shooting dynamic scenes or portrait photography, fast focusing ensures that photographers can capture fleeting moments. However, traditional mechanical focusing structures fall short in this challenge. On the one hand, their focusing speed is often limited by the efficiency and precision of the mechanical transmission, making it difficult to meet the demands of high-speed photography; on the other hand, to accommodate the complex focusing mechanism, the lens size is often too large, making it inconvenient to carry and use, further impacting the shooting experience.

[0004] Therefore, optoelectronic companies urgently need to develop new optical focusing designs to solve problems such as slow focusing speed and large size in existing mechanical structures. Utility Model Content

[0005] This application provides a lens assembly designed to address the problems of slow focusing speed and large size in existing lens assemblies.

[0006] To achieve the above objectives, this application proposes a lens assembly. The lens assembly includes:

[0007] skeleton;

[0008] The focusing assembly includes a lens frame, a focusing lens and an elastic clamping member disposed on the lens frame, wherein the lens frame is slidably disposed within the frame along the axial direction of the optical system.

[0009] The drive mechanism includes a mounting bracket and a piezoelectric actuator and a friction rod disposed on the mounting bracket. The mounting bracket is disposed on the side wall of the frame. The piezoelectric actuator and the friction rod are bonded along the axial direction of the optical system, and the friction rod is clamped on the elastic clamping member.

[0010] In some embodiments, the elastic clamping member includes a mounting portion and an elastic clamping portion connected to the mounting portion, the mounting portion being fixedly connected to the lens group frame, and the elastic clamping portion including a first clamping arm and a second clamping arm;

[0011] The first clamping arm and the second clamping arm always tend to move toward each other to clamp the friction rod between them.

[0012] In some embodiments, at least one of the first clamping arm and the second clamping arm is bent to form a clamping groove that conforms to the shape of the friction rod surface; and the distance between the clamping inlets formed between the first clamping arm and the second clamping arm is designed to gradually decrease from the outside to the inside.

[0013] In some embodiments, the mounting bracket includes a mounting base, the mounting base having a first cavity and a second cavity that communicate with each other, the inner diameter of the first cavity being larger than the inner diameter of the second cavity, and the end of the first cavity away from the second cavity being designed to be through, and the end of the second cavity away from the first cavity having a through hole for the friction rod to pass through and be limited.

[0014] The piezoelectric actuator is connected to the mounting bracket via a fixed base adhered to the opposite side of the friction rod. The fixed base is fixedly disposed in the first cavity, and the piezoelectric actuator is accommodated in the second cavity. There is a telescopic gap between the piezoelectric actuator and the cavity wall of the second cavity with the perforation.

[0015] In some embodiments, the mounting bracket further includes an extension connected to the mounting base. The extension includes a locking plate and a horizontal plate. One end of the locking plate is connected to the mounting base, and the other end is connected to the horizontal plate. The horizontal plate has a limiting hole opposite to the through hole.

[0016] In some embodiments, the side wall of the frame is provided with a clearance hole that allows passage through the internal and external environments, and a limit locking structure is provided between the outer side wall of the frame and the mounting bracket. The mounting bracket is installed on the outer side wall of the frame through the limit locking structure, and the fixing seat, piezoelectric actuator and friction rod enter the interior of the frame through the clearance hole.

[0017] In some embodiments, the limiting locking structure includes a positioning post provided on the outer wall of the skeleton and a positioning hole corresponding to the positioning post on the buckle plate; and includes a first locking part provided on the outer wall of the skeleton and a second locking part provided on the buckle plate corresponding to the first locking part, wherein the first locking part and the second locking part are locked together by a locking member.

[0018] In some embodiments, an incremental displacement sensor is disposed between the sidewall of the skeleton and the lens group frame; the incremental displacement sensor includes a magnetic head disposed on the sidewall of the skeleton and a magnetic grating ruler disposed on the lens group frame corresponding to the magnetic head, the extension direction of the magnetic grating ruler being in the same direction as the axis of the optical system; and,

[0019] A reset sensor is also provided on the side wall of the frame, which is used to confirm the origin position of the incremental displacement sensor.

[0020] This application also discloses a lens that includes the lens assembly described above.

[0021] This application also discloses an image acquisition device, which includes an image sensor and a lens as described above, wherein the image sensor and the lens are detachably connected.

[0022] This application proposes a lens assembly. The lens assembly includes a frame, a focusing group, and a driving mechanism. The focusing group includes a lens group frame, a focusing lens mounted on the lens group frame, and an elastic clamping member. The lens group frame is slidably disposed within the frame along the axial direction of the optical system. The driving mechanism includes a mounting bracket and a piezoelectric actuator and a friction rod mounted on the mounting bracket. The mounting bracket is disposed on the side wall of the frame. The piezoelectric actuator and the friction rod are adhered along the axial direction of the optical system, and the friction rod is clamped onto the elastic clamping member. In this application, a piezoelectric actuator is used as the power source. Based on the piezoelectric stick-slip driving principle, the focusing group is driven to move along the axial direction of the optical system within the frame to achieve focusing. Because the piezoelectric drive has a more compact structural design and features fast response speed and high positioning accuracy, the design volume of the driving mechanism can be effectively reduced, further reducing the size of the lens and improving the focusing speed of the lens. This application also proposes a lens and an image pickup device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a lens assembly according to an embodiment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure behind the hidden skeleton;

[0026] Figure 3This is a schematic diagram of the structure of an elastic clamping member according to an embodiment of this application;

[0027] Figure 4 This is an exploded structural diagram of the drive mechanism of this application;

[0028] Figure 5 This is a schematic diagram of the separation structure of the drive mechanism and the frame in this application;

[0029] Figure 6 This is a schematic diagram of the piezoelectric stick-slip drive principle. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that, unless otherwise stated or limited, all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] It should also be noted that, unless otherwise stated or limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be an intervening element present. When an element is referred to as "connected to" another element, it may be directly connected to the other element or there may be an intervening element present.

[0033] Furthermore, unless otherwise stated or limited, the descriptions involving "first," "second," etc., in this application 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0034] See Figure 1 and Figure 2As shown, this application proposes a lens assembly 100. The lens assembly 100 includes a frame 10, a focusing group 20, and a drive mechanism 30, designed to achieve focusing by driving the focusing group 20 to slide along the optical axis within the frame 10. Wherein:

[0035] The frame 10 is the basic structure of the lens assembly 100, providing a robust frame for supporting and protecting the internal focusing group 20 and drive mechanism 30. The focusing group 20 includes a lens group frame 21, a focusing lens (not shown in the figure) mounted on the lens group frame 21, and a flexible clamping member 22. The lens group frame 21 is a supporting structure for the focusing group 20. The lens group frame 21 is slidably mounted in the frame 10 along the axis of the optical system. When the lens group frame 21 moves, it can drive the focusing lens mounted on it to move, thereby adjusting the focal length to achieve sharp focus. The drive mechanism 30 includes a mounting bracket 31 and a fixed base 32, a piezoelectric actuator 33, and a friction rod 34 disposed on the mounting bracket 31. The fixed base 32, the piezoelectric actuator 33, and the friction rod 34 are sequentially connected along the axial direction of the optical system, which can be achieved by adhesive bonding. The fixed base 32 serves as the mounting foundation for the piezoelectric actuator 33, ensuring the stability and accuracy of the piezoelectric actuator 33 during movement. The fixed base 32 is connected to the mounting bracket 31 and is disposed on the side wall of the frame 10 through the mounting bracket 31. The friction rod 34 is clamped on the elastic clamping member 22, thus establishing the connection between the drive mechanism 30 and the focusing group 20.

[0036] In this application's technical solution, a piezoelectric actuator 33 is used as the power source, aiming to drive the focus group to move based on the piezoelectric stick-slip drive principle to achieve focusing. It is understandable that the piezoelectric stick-slip drive principle is as follows: Figure 6 As shown, it includes: by inputting an electrical signal to the piezoelectric element, its slow elongation and rapid contraction are controlled. Under the combined action of friction and inertial force, long stroke output is achieved through step accumulation. A complete cycle can be divided into three stages: (1) when the driving signal is at time t0, the piezoelectric element is not excited by the electrical signal and is at its original length, and the piezoelectric element is in a stationary state; (2) when the driving signal is at stage t0-t1, the piezoelectric element slowly elongates, pushing the friction rod forward. Under the action of static friction, the friction rod drives the slider to move a distance D to the right. S (3) When the driving signal is in the stage t0-t1, the piezoelectric actuator drives the friction rod to retract rapidly. There is sliding friction between the friction rod and the slider. At this time, the friction force generates a driving effect in the opposite direction of the motion, causing the slider to produce a small displacement in the opposite direction, that is, the displacement retracts D. b When the driving signal is at time t2, the piezoelectric element returns to its original length. The net displacement of the piezoelectric element at the end of one cycle is ΔDs. After n cycles, the slider at the output end of the piezoelectric element generates a total effective step distance of Xs, i.e.:

[0037]

[0038] By changing parameters such as the amplitude, frequency, and duty cycle of the electrical signal, the output characteristics of the piezoelectric element 33 can be altered, thereby enabling the control of parameters such as driving speed, driving direction, and positioning accuracy.

[0039] In the technical solution of this application, the piezoelectric actuator 33 is equivalent to the piezoelectric element in the schematic diagram, the friction rod 34 is equivalent to the friction lever, and the elastic clamp 22 is equivalent to the slider. Driving the elastic clamp 22 to move is equivalent to driving the entire focusing group 20 to move for focusing. When the focal length needs to be adjusted, according to the required displacement, the piezoelectric actuator 33 drives the focusing group 20 to generate a total effective step distance of Xs, ultimately making the adjusted focal length meet the user's needs. Specifically, if controlling the piezoelectric actuator 33 to slowly extend and quickly retract drives the focusing group 20 to move towards the object side of the optical system, then controlling the piezoelectric actuator 33 to quickly extend and slowly retract can drive the focusing group 20 to move towards the image side of the optical system.

[0040] Preferably, the piezoelectric actuator is a piezoelectric ceramic brake.

[0041] In the technical solution of this application, the piezoelectric actuator 33 has a more compact structural design and features fast response speed and high displacement accuracy, which can effectively reduce the design volume of the drive mechanism 30, which is conducive to further reducing the size of the lens and improving the focusing speed of the lens.

[0042] See Figure 3 As shown, in some embodiments, the elastic clamping member 22 includes a mounting portion 221 and an elastic clamping portion 222 connected to the mounting portion 221. The mounting portion 221 is fixedly connected to the lens frame 21, and the elastic clamping portion 222 includes a first clamping arm 223 and a second clamping arm 224. The first clamping arm 223 and the second clamping arm 224 always tend to move towards each other to clamp the friction rod 34 therebetween.

[0043] In this embodiment, the mounting part 221 can be a mounting plate, positioned and overlapped on the edge of the lens frame 21 and locked with screws. The elastic clamping part 222 and the mounting part 221 can be an integral design, and its first clamping arm 223 and second clamping arm 224 are a spring sheet structure with clamping function.

[0044] Understandably, in the non-focusing state, the elastic clamping member 22 and the friction rod 34 remain relatively stationary due to static friction, and this static friction allows the focusing group 20 to remain stationary even when the lens is shaken. Therefore, the slidingly mounted focusing group 20 is in a stable state in the non-focusing state after the friction rod 34 is clamped by the first clamping arm 223 and the second clamping arm 224. Consequently, only when the drive mechanism 30 operates will there be relative movement between the elastic clamping member 22 and the friction rod 34, driving the focusing group 20 to focus.

[0045] Among them, the friction rod 34 provides friction and has the characteristics of being wear-resistant and lightweight, such as a carbon fiber rod.

[0046] Furthermore, at least one of the first clamping arm 223 and the second clamping arm 224 is bent to form a clamping groove 225 that conforms to the surface shape of the friction rod 34, ensuring a tight fit between the clamping groove 225 and the friction rod 34, reducing gaps caused by shape mismatch, and improving clamping stability. Additionally, the distance between the clamping entrances formed between the first clamping arm 223 and the second clamping arm 224 is designed to gradually decrease from the outside to the inside, effectively guiding the friction rod 34 into the space between the first clamping arm 223 and the second clamping arm 224 for clamping.

[0047] See Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the mounting bracket 31 includes a mounting base 311, in which a first cavity 310 and a second cavity 320 are formed. The inner diameter of the first cavity 310 is larger than the inner diameter of the second cavity 320, and the end of the first cavity 310 away from the second cavity 320 is designed to be through. The end of the second cavity 320 away from the first cavity 310 has a through hole 330 for the friction rod 34 to pass through and be limited. The fixing base 32 is fixedly disposed in the first cavity 310, the piezoelectric actuator 33 is accommodated in the second cavity 320, and there is a telescopic gap between the piezoelectric actuator 33 and the cavity wall of the second cavity 320 with the through hole 330.

[0048] In this embodiment, the mounting base 311 in the mounting bracket 31 supports the fixed base 32, the piezoelectric actuator 33, and the friction rod 34. A first cavity 310 for housing the fixed base 32 and a second cavity 320 for housing the piezoelectric actuator 33 are respectively provided. Because the inner diameter of the first cavity 310 is larger than the inner diameter of the second cavity 320, a limiting step is formed at the junction of the first cavity 310 and the second cavity 320.

[0049] When installing the mounting base 32, piezoelectric actuator 33, and friction rod 34, the mounting base 32, piezoelectric actuator 33, and friction rod 34 can be bonded together in sequence beforehand. Then, they are inserted from the opening at the end of the first cavity 310 away from the second cavity 320 until the mounting base 32 abuts against the limiting step. At this time, the friction rod 34 can pass through the through hole 330 and then connect with the elastic clamp 22. There is a telescopic gap between the piezoelectric actuator 33 and the wall of the second cavity 320 with the through hole 330. This telescopic gap can ensure that the working stroke of the piezoelectric actuator 33 is not affected, and it can freely extend and retract to achieve precise control of the friction rod 34.

[0050] The first cavity 310 has several raised ribs (not shown in the attached figure) spaced at intervals along the axial direction of the optical system on its peripheral sidewall. After the mounting base 32 is inserted into the first cavity 310, it can be fixed by injecting glue into the gaps between the raised ribs. Furthermore, the mounting base 32 is connected to the external environment through an opening at the end of the first cavity 310 away from the second cavity 320, which further enhances the heat dissipation effect on the piezoelectric actuator 33.

[0051] Furthermore, the mounting bracket 31 also includes an extension 312 connected to the mounting base 311. The extension 312 includes a locking plate 2121 and a horizontal plate 2122. One end of the locking plate 2121 is connected to the mounting base 311, and the other end is connected to the horizontal plate 2122. The horizontal plate 2122 has a limiting hole 340 opposite to the through hole 330. The mounting base 311 and the extension 312 can be an integral design. By setting the limiting hole 340 on the horizontal plate 2122, the limiting ability of the friction rod 34 can be further enhanced, thereby improving the stability of the friction rod 34 during movement.

[0052] See Figure 5 As shown, in some embodiments, the side wall of the frame 10 is provided with a clearance hole 110 that allows passage through the internal and external environments, and a limit locking structure is provided between the outer side wall of the frame 10 and the mounting bracket 31. The mounting bracket 31 is installed on the outer side wall of the frame 10 through the limit locking structure, and the fixing seat 32, piezoelectric actuator 33 and friction rod 34 enter the interior of the frame 10 through the clearance hole 110.

[0053] In this embodiment, the aim is to propose a method for mounting the drive mechanism 30 on the frame 10. Through the design of the clearance hole 110, the drive mechanism 30 can be mounted on the outer side wall of the frame 10, and the main drive component in the drive mechanism 30 can enter the frame 10, thereby connecting the friction rod 34 with the elastic clamping member 22.

[0054] By mounting on the outer wall, the drive mechanism 30 can avoid occupying too much internal space, which would lead to structural complexity and increased size. Furthermore, the part of the drive mechanism 30 that is installed and connected is located on the outside of the frame 10, which facilitates the installation, maintenance and replacement of the drive mechanism 30, greatly improving convenience and efficiency.

[0055] Furthermore, the limiting and locking structure includes a positioning post 111 provided on the outer wall of the frame 10 and a positioning hole 350 on the locking plate 2121 corresponding to the positioning post 111. When the mounting bracket 31 is installed, the locking plate 2121 fits against the outer wall of the frame 10, and the positioning post 111 can be accurately inserted into the positioning hole 350, thereby achieving the initial positioning and fixation of the mounting bracket 31. It also includes a first locking part 112 provided on the outer wall of the frame 10 and a second locking part 360 provided on the locking plate 2121 corresponding to the first locking part 112. The first locking part 112 and the second locking part 360 are locked together by a locking member. The first locking part 112 and the second locking part 360 are typically threaded hole structures. When the locking plate 2121 is attached to the outer wall of the frame 10 and the positioning pin 111 has been inserted into the positioning hole 350, the first locking part 112 and the second locking part 360 are locked together by locking components such as screws and bolts, thereby achieving a firm fixation of the mounting bracket 31.

[0056] Multiple sets of positioning pins 111 and positioning holes 350, and first locking parts 112 and second locking parts 360 can be provided to ensure accurate positioning and secure and reliable installation of the mounting bracket 31. Furthermore, the design of the upper limit locking structure makes the installation and removal of the mounting bracket 31 easier, which helps improve the installation efficiency and maintainability of the lens assembly 100.

[0057] See Figure 1 and Figure 2 As shown, in some embodiments, an incremental displacement sensor is provided between the sidewall of the frame 10 and the lens group frame 21; the incremental displacement sensor includes a magnetic head disposed on the sidewall of the frame 10 and a magnetic grating ruler 41 disposed on the lens group frame 21 corresponding to the magnetic head (not shown in the figure), and the extension direction of the magnetic grating ruler 41 is in the same direction as the axis of the optical system.

[0058] In this embodiment, a method for measuring the displacement of the focusing group 20 during focusing is proposed. Specifically, when the lens group frame 21 moves in the axial direction of the optical system, the magnetic grating ruler 41 also moves accordingly. The magnetic head can sense the change in the magnetic field on the magnetic grating ruler 41 and convert these changes into electrical signals for output, thereby accurately measuring the displacement of the lens group frame 21 and realizing precise control of parameters such as the focal length and focusing position of the optical system.

[0059] Furthermore, a reset sensor 42 is provided on the side wall of the skeleton 10. Specifically, the reset sensor 42 recalibrates the incremental displacement sensor by triggering a known origin position, thereby ensuring the accuracy of its measurement.

[0060] This application also provides a lens, which includes the lens assembly 100 as described above. The lens adopts all the technical solutions of all embodiments of the lens assembly 100 described above, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0061] This application also provides an image pickup device, which includes an image sensor and the lens described above, wherein the image sensor and the lens are detachably connected. In this embodiment, the image pickup device adopts all the technical solutions of all the above-described lens embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0062] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A lens assembly, characterized by, The utility model relates to a kind of optical focusing mechanism, including: Skeleton; Focus group, including lens group frame and focusing lens and elastic holder arranged on the lens group frame, the lens group frame is slid along the axial direction of optical system in the skeleton; Driving mechanism, including mounting bracket and piezoelectric actuator and friction rod arranged on the mounting bracket, the mounting bracket is arranged on the side wall of the skeleton, the piezoelectric actuator and the friction rod are adhered along the axial direction of the optical system, and the friction rod is clamped on the elastic holder.

2. The lens assembly of claim 1, wherein, The elastic holder includes a mounting portion and an elastic clamping portion connected to the mounting portion, the mounting portion is fixedly connected to the lens group frame, and the elastic clamping portion includes a first clamping arm and a second clamping arm. Wherein, the first clamping arm and the second clamping arm always have a tendency to move towards each other to clamp the friction rod therebetween.

3. The lens assembly of claim 2, wherein, At least one of the first clamping arm and the second clamping arm is bent to form a clamping groove that conforms to the surface shape of the friction rod, and the distance between the clamping entrance formed between the first clamping arm and the second clamping arm gradually decreases from outside to inside.

4. The lens assembly of claim 1, wherein, The mounting bracket includes a mounting seat, a first cavity and a second cavity are formed in the mounting seat, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, and the end of the first cavity away from the second cavity is designed to be through, and the end of the second cavity away from the first cavity is provided with a through hole for the friction rod to pass through and be limited. Wherein, the piezoelectric actuator is connected to the mounting bracket through a fixed seat adhered to the opposite side of the friction rod, the fixed seat is fixedly arranged in the first cavity, the piezoelectric actuator is accommodated in the second cavity, and there is an expansion gap between the piezoelectric actuator and the cavity wall provided with the through hole of the second cavity.

5. The lens assembly of claim 4, wherein, The mounting bracket further includes an extension member connected to the mounting seat, the extension member includes a locking plate and a cross plate, one end of the locking plate is connected to the mounting seat, the other end is connected to the cross plate, and the cross plate is provided with a limiting hole opposite to the through hole.

6. The lens assembly of claim 5, wherein, The side wall of the skeleton is provided with an avoidance hole through the inside and outside environment, and a limiting locking structure is arranged between the outer side wall of the skeleton and the mounting bracket, the mounting bracket is mounted on the outer side wall of the skeleton through the limiting locking structure, and the fixed seat, the piezoelectric actuator and the friction rod enter the inside of the skeleton through the avoidance hole.

7. The lens assembly according to claim 6, wherein, The limiting locking structure includes a positioning column arranged on the outer side wall of the skeleton and a positioning hole corresponding to the positioning column arranged on the locking plate; and includes a first locking portion arranged on the outer side wall of the skeleton and a second locking portion corresponding to the first locking portion arranged on the locking plate, the first locking portion and the second locking portion are connected by a locking member.

8. The lens assembly of claim 1, wherein, The side wall of the skeleton and the lens group frame are provided with an incremental displacement sensor; the incremental displacement sensor includes a magnetic head arranged on the side wall of the skeleton and a magnetic scale arranged on the lens group frame corresponding to the magnetic head, the extension direction of the magnetic scale is the same as the axial direction of the optical system; and, A reset sensor is further arranged on the side wall of the skeleton, and the reset sensor is used to confirm the original position of the incremental displacement sensor.

9. A lens characterized by comprising: The lens includes the lens assembly of any one of claims 1-8.

10. An image pickup device, characterized by comprising: An image sensor configured to receive an image formed by the lens, and the lens of claim 9.

Images