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 frame and a rolling structural member. The focusing frame is movably arranged in the skeleton along the optical axial direction; the rolling structural member is arranged on the side surface of the focusing frame; the rolling structural part comprises a first guide rail, a rolling part and a pressing part. The two ends of the first guide rail are installed on the framework and are in the same direction with the optical axial direction. The rolling piece is at least arranged between the focusing frame and the first guide rail; and the pressing piece is used for keeping the rolling piece in a state of being clamped between the focusing frame and the first guide rail. According to the technical scheme, the pressing piece is arranged, so that the rolling piece is tightly attached to the first guide rail, the assembly precision of the rolling piece is improved, and the focusing precision is improved in the focusing process.

Description

Technical Field

[0001] The present application relates to the field of lens technology, and in particular to a lens assembly, a lens and an image pickup device. Background Art

[0002] As the imaging industry has increasingly higher requirements for image quality, the optical design of lenses requires the use of multiple lenses for floating focus, and the weight of the focus group increases accordingly. Therefore, the requirements for motor thrust and the smoothness and compactness of the focus structure are also becoming higher and higher.

[0003] Traditional lens assemblies usually use a ball structure to assist in the focusing process. Although the use of a ball structure can reduce the friction between the focusing group and the frame and reduce resistance, the existing focusing method cannot guarantee the layout position of each ball structure and the assembly accuracy of the ball and ball guide, resulting in a decrease in focusing accuracy.

[0004] Therefore, it is necessary to improve the existing lens assembly. Utility Model Content

[0005] The present application provides a lens assembly, a lens and an image pickup device, aiming to solve the problem that the traditional focusing structure cannot ensure the assembly accuracy of the rolling parts, resulting in a decrease in focusing accuracy.

[0006] To achieve the above-mentioned purpose, the present application provides a lens assembly. The lens assembly comprises:

[0007] skeleton;

[0008] A focusing frame, movably arranged in the frame along the optical axis;

[0009] A rolling structure is arranged on the side of the focusing frame; the rolling structure includes a first guide rail, a rolling member and a pressing member; both ends of the first guide rail are installed on the skeleton and are in the same direction as the optical axis; the rolling member is at least arranged between the focusing frame and the first guide rail; the pressing member is used to keep the rolling member clamped between the focusing frame and the first guide rail.

[0010] In some embodiments, the pressing piece is arranged opposite to the focusing frame, and an enclosed space is formed between the pressing piece and the focusing frame; and one end of the pressing piece is rotatably connected to the focusing frame along the optical axis, and an extrusion structure is arranged between the other end and the focusing frame, and the extrusion structure is used to drive the pressing piece to rotate around its one end toward the focusing frame;

[0011] Wherein, the first guide rail passes through the enclosed space, and the rolling member is arranged between the focusing frame and the first guide rail and between the first guide rail and the pressing member.

[0012] In some embodiments, the extrusion structure includes an adjusting member and an elastic member, the adjusting member is movably disposed on the focusing frame, the other end of the pressing member passes through the adjusting member, and the elastic member abuts between the free end of the adjusting member and the pressing member.

[0013] In some embodiments, the first guide rail includes a first guide shaft and a second guide shaft arranged in parallel and spaced apart, and the two ends of the first guide shaft and the second guide shaft are respectively connected and fixed to the skeleton through bushings; and the setting interval between the first guide shaft and the second guide shaft can satisfy the requirement that the rolling element is limited to rolling on opposite sides of the first guide rail.

[0014] In some embodiments, it further includes a limiting sleeve slidably disposed on the first guide shaft and the second guide shaft, the limiting sleeve includes a sleeve body, and a first sliding groove corresponding to the first guide shaft and a second sliding groove corresponding to the second guide shaft are opened on opposite sides of the sleeve body, and the limiting sleeve is limited between the first guide shaft and the second guide shaft; and

[0015] The limiting sleeve is provided with accommodating holes on both sides adjacent to the slide groove, and each of the accommodating holes is connected to the first guide shaft and the second guide shaft. The rolling element is arranged corresponding to the accommodating holes and is partially exposed outside the accommodating holes.

[0016] In some embodiments, a second guide rail is provided on the side of the focusing frame corresponding to the first guide rail, and the second guide rail includes a third guide shaft and a fourth guide shaft arranged in parallel and spaced apart; the rolling element close to one side of the focusing frame is squeezed and limited between the third guide shaft and the fourth guide shaft at the same time.

[0017] In some embodiments, the two ends of the focusing frame are respectively provided with a first limit end and a second limit end corresponding to the moving path of the rolling element, and the two ends of the pressing element are respectively provided with a third limit end and a fourth limit end corresponding to the moving path of the rolling element; the first limit end, the second limit end, the third limit end and the fourth limit end are all used to prevent the enclosed space.

[0018] In some embodiments, the lens assembly further includes an axial hole structure; the axial hole structure includes an axial hole opened on the focus frame, and a shaft arranged along the optical axis and having a clearance fit with the axial hole, the axial hole is arranged on the other side of the focus frame opposite to the rolling structure, and both ends of the shaft are mounted on the frame;

[0019] Wherein, the matching length between the shaft hole and the shaft rod in the optical axis direction is smaller than the thickness of the focusing frame.

[0020] In some embodiments, a first limiting plane is provided at one end of the skeleton, and the first limiting plane is used to limit the movement of the focusing frame toward one end of the skeleton. A second limiting plane is provided at the other end of the skeleton, and the second limiting plane is used to limit the movement of the focusing frame toward the other end of the skeleton.

[0021] In some embodiments, the four corners of the focusing frame are concave and extend along the optical axis to form four L-shaped limit grooves, and the inner side of the skeleton is provided with four abutment portions corresponding to the four L-shaped limit grooves and spaced apart from each other; the four abutment portions are used to cooperate with the four L-shaped limit grooves to limit the movement of the focusing frame in the first direction and the second direction; the first direction and the second direction are directions perpendicular to the optical axis.

[0022] The present application also provides a lens, which includes the lens assembly as described above.

[0023] The present application also provides an image pickup device, which includes a camera body and the lens as described above, wherein the lens is detachably connected to the camera body.

[0024] The technical solution of the present application proposes a lens assembly, a lens and an image pickup device. The lens assembly includes a focus frame and a rolling structure; the rolling structure is arranged on the side of the focus frame; the rolling structure includes a first guide rail, a rolling member and a pressing member; the two ends of the first guide rail are installed on the skeleton and are in the same direction as the optical axis; the rolling member is at least arranged between the focus frame and the first guide rail, and the pressing member is used to keep the rolling member clamped between the focus frame and the first guide rail. The technical solution of the present application arranges a pressing member so that the rolling member is close to the first guide rail, thereby increasing the assembly accuracy of the rolling member, thereby improving the focusing accuracy during the focusing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0026] Figure 1 This is a schematic cross-sectional view of a lens assembly according to an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the assembly structure of a focus frame and a rolling structure according to an embodiment of the present application;

[0028] Figure 3 for Figure 2 Schematic diagram of the decomposition structure;

[0029] Figure 4 for Figure 2 Schematic diagram of the structure of the middle focus frame;

[0030] Figure 5 for Figure 2 Schematic diagram of the structure of the intermediate pressure fitting;

[0031] Figure 6 for Figure 2 A schematic diagram of the structure of the middle limit sleeve;

[0032] Figure 7 for Figure 2 Schematic diagram of the structure of the middle shaft sleeve;

[0033] Figure 8 This is a schematic cross-sectional structure diagram of the lens assembly of the present application;

[0034] Fig. 9 This is a schematic diagram of the cross-sectional structure of the lens assembly of the present application when it is located at an extreme focusing position at one end;

[0035] Fig.10 This is a schematic diagram of the cross-sectional structure when the lens assembly of this application is located at the extreme focusing position at the other end. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0039] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] See also Figure 1 As shown, the present application proposes a lens assembly 100, which includes a frame 10, a focus frame 20 and a rolling structure 30; the focus frame 20 is movably arranged in the frame 10 along the optical axis; the rolling structure 30 is arranged on the side of the focus frame 20; the rolling structure 30 includes a first guide rail 31, a rolling member 32 and a pressing member 33. Among them, both ends of the first guide rail 31 are installed on the frame 10 and are in the same direction as the optical axis; the rolling member 32 is at least arranged between the focus frame 20 and the first guide rail 31, and the pressing member 33 is used to keep the rolling member 32 clamped between the focus frame 20 and the first guide rail 31.

[0041] In the technical solution of the present application, the frame 10, as the basic structure of the entire lens assembly 100, needs to have sufficient strength and stability to ensure that the lens assembly 100 can maintain stable performance in various use environments. The focus frame 20 is a component for carrying the lens, which is movably mounted on the frame 10, and its movement along the optical axis in the frame 10 can realize the focusing operation of the lens.

[0042] The lens is the core optical element in the lens assembly 100, which is responsible for focusing light and forming a clear image. The rolling structure 30 is arranged on the side of the focus frame 20, and is used to construct a rolling contact between the focus frame 20 and the first guide rail 31 during the focusing process, thereby reducing the friction resistance during the movement of the focus frame 20 and improving the efficiency and accuracy of focusing.

[0043] Specifically, the rolling structure 30 provided in the present application includes a first guide rail 31, a rolling member 32 and a pressing member 33. Under the action of the pressing member 33, the rolling member 32 can be tightly fitted on the first guide rail 31, thereby ensuring the high assembly accuracy between the rolling member 32 and the first guide rail 31, and further ensuring the smoothness and accuracy of the movement between the focus frame 20 and the first guide rail 31. Among them, the first guide rail 31 is a moving guide rail for the rolling member 32, which guides the rolling of the rolling member 32. In this way, the focus frame 20 is in rolling contact with the first guide rail 31 through the rolling member 32, and moves along the first guide rail 31, driving the lens or lens group to move to achieve the focusing function. Furthermore, the rolling member 32 is a ball.

[0044] like Figure 2 as well as Figure 3 As shown, in some embodiments, one end of the pressing member 33 is rotatably connected to the focus frame 20 along the optical axis, and a pressing structure 34 is disposed between the other end and the focus frame 20, and the pressing structure 34 is used to drive the pressing member 33 to rotate around its one end toward the focus frame 20; wherein the first guide rail 31 penetrates the enclosed space, and the rolling member 32 is disposed between the focus frame 20 and the first guide rail 31, and between the first guide rail 31 and the pressing member 33. Further, the pressing structure 34 includes an adjusting member 341 and an elastic member 342, wherein the adjusting member 341 is movably disposed on the focus frame 20, the other end of the pressing member 33 passes through the adjusting member 341, and the elastic member 342 abuts between the free end of the adjusting member 341 and the pressing member 33.

[0045] It can be understood that during assembly, the focus frame 20 and the rolling structure 30 are assembled in advance, and then the whole is installed on the frame 10. At this time, based on the connection relationship between the pressing member 33 and the focus frame 20, under the action of the extrusion structure 34, the pressing member 33 and the focus frame 20 always have a tendency to move toward each other, and the rolling member 32 can be gradually pressed and fitted on the first guide rail 31.

[0046] Further, such as Figure 1 As shown, the rolling member 32 is arranged along both sides of the first guide rail 31, so that by adding a pressing member 33 to achieve the effect of pressing the rolling member 32, it can be further ensured that there is also rolling contact between the pressing member 33 and the first guide rail 31, thereby improving the smoothness of the pressing member 33 when moving with the focus frame.

[0047] In some embodiments, at least two rolling elements 32 are arranged at intervals on each side of the first guide rail 31 along the optical axis. This layout enhances the stability of the focus frame 20 during movement and reduces the focus deviation caused by vibration or impact. The pressing element 33 can be a pressing plate, one end of which is rotatably connected to the focus frame 20 via a rotating shaft 331. The pressing plate is used to press the rolling element 32. A guide groove 332 is opened along the optical axis. Figure 5 shown.

[0048] It is worth noting that the design scheme adopted by the extrusion structure 34, on the one hand, provides driving force for the relative movement between the focus frame 20 and the pressing piece 33, and on the other hand, allows fine adjustment of the distance between the focus frame 20 and the pressing piece 33. This facilitates adjustment of the contact pressure between the rolling element 32 and the first guide rail 31, that is, the pressing force on the rolling element 32; so as to adapt to different focusing requirements or compensate for the performance degradation caused by wear. For example, when a larger contact pressure is required, the distance between the free end of the adjusting piece 341 and the focus frame 20 can be reduced, thereby further compressing the elastic piece 342 and increasing the elastic driving force of the elastic piece 342.

[0049] Furthermore, the adjusting member 341 is a screw, the elastic member 342 is a compression spring, the adjusting member 341 is threadedly connected to the focusing frame 20, and the compression spring abuts between the pressing member 33 and the nut of the screw. It is a common and effective design choice to use a screw as the adjusting member 341 and a compression spring as the elastic member 342. By rotating the screw, its position on the focusing frame 20 can be easily adjusted, thereby changing the compression amount of the compression spring. The greater the compression amount, the greater the driving force between the focusing frame 20 and the pressing member 33. In this way, the contact pressure between the rolling member 32 and the first guide rail 31 can be fine-tuned by adjusting the elastic force of the spring; the greater the contact pressure, the tighter the rolling member 32 is pressed.

[0050] In some embodiments, when the focus frame 20 and the rolling structure 30 are assembled and not assembled on the frame 10, in order to prevent the rolling member 32 from escaping from the enclosed space, the two ends of the focus frame 20 are respectively provided with a first limit end 221 and a second limit end 222 corresponding to the moving path of the rolling member 32, such as Figure 4 As shown; the two ends of the pressing member 33 are respectively provided with a third limiting end (not shown in the drawings) and a fourth limiting end (not shown in the drawings) corresponding to the moving path of the rolling member 32. When the pressing plate is provided with a guide groove 332, the third limiting end and the fourth limiting end can be the groove walls at both ends of the guide groove 332.

[0051] It is worth noting that after the lens assembly 100 is assembled on the frame 10, and during the movement of the focus frame 20, the rolling element 32 will roll along the first guide rail 31 in the direction of movement of the focus frame 20, and the rolling distance of the rolling element 32 is half of the moving distance of the focus frame 20. When the rolling direction of the rolling element 32 is restricted, the contact between the focus frame 20 and the rolling element 32 will become a sliding contact, and the friction resistance will increase.

[0052] Among them, when the first limit end 221, the second limit end 222, the third limit end and the fourth limit end are provided, these limit ends will become limiting factors for the rolling of the rolling element 32 during the focusing process, and may limit the rolling of the rolling element 32; therefore, in the assembly design of the skeleton 10, it is necessary to design the moving process of the focus frame 20 and the moving process of the rolling element 32, so that when the focus frame 20 moves to the extreme positions at both ends during the focusing process, its rolling element 32 will not contact the first limit end 221 or the second limit end 222. Among them, the state of the focus frame 20 when it moves to the extreme positions at both ends is as follows: Fig. 9 and Fig.10 shown.

[0053] See also Figure 3 As shown, in some embodiments, the first guide rail 31 includes a first guide shaft 311 and a second guide shaft 312 arranged in parallel and spaced apart, and the first guide shaft 311 and the second guide shaft 312 are connected by sleeves 36 at both ends; and the setting interval between the first guide shaft 311 and the second guide shaft 312 can satisfy that the rolling element 32 is limited between the guide shafts for rolling.

[0054] In this embodiment, the first guide shaft 311 and the second guide shaft 312 are both shaft rod structures. The shaft rod processing is simple, which can reduce the preparation cost of the first guide shaft 311. The rigid design of the guide shaft enables the rolling element 32 to maintain a stable state when it is pressed tightly against the first guide rail 31.

[0055] Specifically, the first guide shaft 311 and the second guide shaft 312 are connected by the sleeve 36, and the sleeve 36 maintains the parallelism and spacing distance between the two guide shafts, thereby providing a clear rolling path for the rolling element 32 on both sides of the first guide shaft 311 and the second guide shaft 312, preventing the rolling element 32 from offsetting or falling off during the rolling process, thereby improving the reliability and stability of the movement of the focus frame 20.

[0056] Moreover, one sleeve 36 is provided at each end of the first guide shaft 311 and the second guide shaft 312. In the lens assembly 100, the sleeves 36 at both ends can prevent the first guide rail 31 from moving and completely detaching from the space enclosed between the pressing piece 33 and the focusing frame 20, thereby facilitating the transportation of the lens assembly 100.

[0057] See also Figure 4As shown, in some embodiments, a second guide rail 21 is provided on the side of the focus frame 20 corresponding to the first guide rail 31, and the second guide rail 21 includes a third guide shaft 211 and a fourth guide shaft 212 that are arranged in parallel and spaced apart; when the focus frame 20 moves relative to the pressing piece 33, the rolling piece 32 close to the side of the focus frame 20 is squeezed and limited between the third guide shaft 211 and the fourth guide shaft 212 at the same time.

[0058] In this embodiment, the second guide rail 21 is provided corresponding to the first guide rail 31, and the second guide rail 21 has the same structure as the first guide rail 31, except that the second guide rail 21 is fixed to the side of the focus frame 20 and moves with the focus frame 20. The third guide shaft 211 and the fourth guide shaft 212 together with the first guide shaft 311 and the second guide shaft 312 can form a more stable rolling frame, reducing the shaking and deviation of the focus frame 20 and the rolling member 32 during the movement.

[0059] See also Figure 3 as well as Figure 6 As shown, in some embodiments, the rolling structure 30 also includes a limit sleeve 35 slidably set on the first guide shaft 311 and the second guide shaft 312, and the limit sleeve 35 is used to limit the initial setting position of the rolling element 32 and maintain the spacing distance between the rolling elements 32 on each side of the first guide rail 31.

[0060] The limiting sleeve 35 includes a sleeve body 350, and the sleeve body 350 has two opposite sides provided with a first sliding groove 351 corresponding to the first guide shaft 311 and a second sliding groove 352 corresponding to the second guide shaft 312, and the limiting sleeve 35 is clamped between the first guide shaft 311 and the second guide shaft 312; and, the limiting sleeve 35 has two sides adjacent to the sliding groove provided with receiving holes 353 connecting the first guide shaft 311 and the second guide shaft 312, and the rolling element 32 is arranged corresponding to each receiving hole 353, and is partially exposed outside the receiving hole 353; wherein, the width of the receiving hole 353 is greater than the diameter of the rolling element 32.

[0061] In this embodiment, the first slide groove 351 corresponding to the first guide shaft 311 and the second slide groove 352 corresponding to the second guide shaft 312 are respectively provided on opposite sides of the sleeve body 350. The design of the two slide grooves allows the limit sleeve 35 to slide smoothly along the first guide shaft 311 and the second guide shaft 312 without deviation or falling off. In addition, during assembly, it is only necessary to align the limit sleeve 35 with the guide shaft and slide it into place without the need for complex fixing devices or steps. Similarly, the limit sleeve 35 can be easily disassembled and replaced during maintenance, reducing maintenance costs and difficulties. At the same time, based on the sliding design of the limit sleeve 35, during the focusing process, the rolling element 32 can push the limit sleeve 35 to move along the first guide shaft 311 and the second guide shaft 312 to prevent the limit sleeve 35 from restricting the rolling of the rolling element 32.

[0062] It is worth noting that the sleeve 36 in the present application includes a first portion 361 and a second portion 362 that are integrally arranged. Figure 7 As shown. The diameter of the first part 361 is greater than the diameter of the second part 362, and the first part 361 is close to the outside, and the first part 361 prevents the first guide rail 31 from moving and completely leaving the enclosed space; the second part 362 has a limiting effect on the movement of the limiting sleeve 35. Usually, the length of the limiting sleeve 35 is precisely calculated so that when the focus frame 20 moves to the extreme positions at both ends during the focusing process, the limiting sleeve 35 can just or not contact the second part 362 of the shaft sleeve 36; such a design is also helpful for the assembly of various components.

[0063] An assembly process of the lens assembly 100 is as follows: first, the limiting sleeve 35 is placed in the first guide rail 31, and after the shaft sleeve 36 is installed, the limiting sleeve 35 is pushed to abut against the second part 362 of the shaft sleeve 36 at one end; then, the rolling member 32 is placed in the receiving hole 353 of the limiting sleeve 35, and the first guide rail 31 with the rolling member 32 is moved between the stretched focus frame 20 and the pressing member 33; finally, under the action of the extrusion structure 34, the focus frame 20 and the pressing member 33 simultaneously press the rolling member 32 from both sides to fit the middle first guide rail 31. Among them, after completing the assembly process of the lens assembly 100, it is necessary to ensure that the first part 361 of the shaft sleeve 36 at the same end is simultaneously abutted against the focus frame 20 and / or the pressing member 33. In this way, the assembly requirements of the lens assembly 100 can be met, and focusing operations can be performed conveniently after being installed on the frame 10.

[0064] In addition, the receiving hole 353 is a waist-shaped hole, and the length direction of the waist-shaped hole is perpendicular to the length direction of the first guide rail 31. This allows a certain clearance to exist between the rolling element 32 and the receiving hole 353 when the focus frame 20 falls along the length direction after the lens assembly 100 is installed on the frame 10, thereby reducing the force between the rolling element 32 and the limiting sleeve 35.

[0065] See also Figure 4 as well as Figure 8 As shown, in some embodiments, the lens assembly 100 also includes an axial hole structure 40, which includes an axial hole 41 opened on the focusing frame 20, and a shaft rod 42 arranged along the optical axis and loosely matched with the axial hole 41, the axial hole 41 is arranged on the other side of the focusing frame 20 opposite to the rolling structure 30, and both ends of the shaft rod 42 are fixed to both ends of the skeleton 10; wherein, the matching length of the axial hole 41 and the shaft rod 42 in the optical axis direction is less than the thickness of the focusing frame 20.

[0066] In the lens assembly 100 proposed in the technical solution of the present application, the two ends of the first guide rail 31 are connected to the two ends of the skeleton 10, and then during the focusing process, the focus frame 20 rolls with the first guide rail 31 based on the provided rolling member 32. It is also proposed that an axial hole structure 40 is provided between the focus frame 20 and the skeleton 10, and the axial hole 41 is provided on the other side of the focus frame 20 opposite to the rolling structure 30. In this way, the axial hole structure 40 and the rolling structure 30 are respectively provided on both sides of the focus frame 20, and together constitute a mobile support system for the focus frame 20, wherein the two ends of the shaft rod 42 are installed on the two ends of the skeleton 10, thereby ensuring the stability of the shaft rod 42.

[0067] It is further proposed that the matching length of the shaft hole 41 and the shaft rod 42 in the optical axis direction is less than the thickness of the focus frame 20, so that even if there is sliding friction between the shaft hole 41 and the second guide shaft 312, the contact area of ​​the sliding friction can be reduced because the matching length is short, thereby reducing the friction resistance. This helps to make the movement of the focus frame 20 smoother and improve the sensitivity and response speed of focusing.

[0068] It is further proposed that the shaft hole 41 and the shaft rod 42 are clearance matched, and then when the focus frame 20 falls in the direction perpendicular to the optical axis, there is an avoidance gap between the shaft hole 41 and the shaft rod 42, so that the focus frame 20 can be fine-tuned in the direction perpendicular to the optical axis. The design of the shaft hole structure 40 and the design of the rolling element 32 in the receiving hole 353 are matched at the same time, so that when the focus frame 20 falls in the direction perpendicular to the optical axis, there is a certain gap for avoidance; and combined with the relevant limit structure, the force on its internal components can be reduced, forming protection for the components and completing force optimization.

[0069] See also Figure 8 As shown, in some embodiments, the limiting structure can be four L-shaped limiting grooves 25 formed by being recessed at the four corners of the focusing frame 20 and extending along the optical axis, and four abutment portions 110 are spaced apart on the inner side of the skeleton 10 corresponding to the four L-shaped limiting grooves 25; the four abutment portions 110 are used to cooperate with the four L limiting grooves to realize the movement limiting of the focusing frame 20 in the first direction and the second direction; the first direction and the second direction are perpendicular to the optical axis.

[0070] It is worth noting that during the falling process of the focus frame 20 in the direction perpendicular to the optical axis, the four abutting parts 110 bear the force. That is, during the falling process of the focus frame 20 in the direction perpendicular to the optical axis, when the focus frame 20 contacts the abutting parts 110, there is still margin for the movement stroke of the rolling element 32 in the accommodating cavity 353, and there is still margin for the movement stroke of the pressing element 33, so that the force on the pressing element 33 and the limiting sleeve 35 is relatively small. When designing the structural strength of the pressing element 33 and the limiting sleeve 35, only their own weight needs to be considered, so that the setting volume can be greatly reduced.

[0071] It is also worth noting that when the focus frame 20 falls in the direction of the rolling member 32 that is pressed by it, because the focus frame 20, the rolling member 32 and the first guide rail 31 are themselves in a pressed state, and the first guide rail 31 is fixed, the first guide rail 31 is subjected to force at this time.

[0072] In some embodiments, a first limiting plane 120 is provided at one end of the skeleton 10, and the first limiting plane 120 is used to limit the movement of the focusing frame 20 toward one end of the skeleton 10. A second limiting plane 130 is provided at the other end of the skeleton 10, and the second limiting plane 130 is used to limit the movement of the focusing frame 20 toward the other end of the skeleton 10.

[0073] In the present embodiment, the first limiting plane 120 and the second limiting plane 130 are used to limit the maximum distance of the focusing frame 20 when focusing, so that when the focusing frame 20 reaches the limit position, the rolling element 32 does not roll and contact the first limiting end 221 and the second limiting end 222 of the focusing frame 20, and the third limiting end and the fourth limiting end at both ends of the pressing member 33, thereby ensuring the rolling state of the rolling element 32.

[0074] The present application also provides a lens, which includes the above lens assembly 100. The lens adopts all technical solutions of all embodiments of the above lens assembly 100, and thus has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0075] The present application also provides an image pickup device, which includes a camera body and the above lens. The image pickup device adopts all technical solutions of all embodiments of the above lens, and thus has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the lens is detachably connected to the camera body.

[0076] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A lens assembly, characterized in that: include: skeleton; A focusing frame, movably arranged in the frame along the optical axis; A rolling structure is arranged on the side of the focusing frame; the rolling structure includes a first guide rail, a rolling member and a pressing member; both ends of the first guide rail are installed on the skeleton and are in the same direction as the optical axis; the rolling member is at least arranged between the focusing frame and the first guide rail; the pressing member is used to keep the rolling member clamped between the focusing frame and the first guide rail.

2. The lens assembly according to claim 1, characterized in that: The pressing piece is arranged opposite to the focusing frame, and an enclosed space is formed between the pressing piece and the focusing frame; one end of the pressing piece is rotatably connected to the focusing frame along the optical axis, and an extrusion structure is arranged between the other end and the focusing frame, and the extrusion structure is used to drive the pressing piece to rotate around one end thereof toward the focusing frame; Wherein, the first guide rail passes through the enclosed space, and the rolling member is arranged between the focusing frame and the first guide rail and between the first guide rail and the pressing member.

3. The lens assembly according to claim 2, characterized in that: The extrusion structure includes an adjusting member and an elastic member. The adjusting member is movably arranged on the focusing frame. The other end of the pressing member passes through the adjusting member, and the elastic member abuts between the free end of the adjusting member and the pressing member.

4. The lens assembly according to claim 2, characterized in that: The first guide rail includes a first guide shaft and a second guide shaft arranged in parallel and at intervals, and the two ends of the first guide shaft and the second guide shaft are respectively connected and fixed to the frame through bushings; and the setting interval between the first guide shaft and the second guide shaft can meet the requirement that the rolling element is limited to rolling on opposite sides of the first guide rail.

5. The lens assembly according to claim 4, characterized in that: It also includes a limiting sleeve slidably disposed on the first guide shaft and the second guide shaft, the limiting sleeve including a sleeve body, a first sliding groove corresponding to the first guide shaft and a second sliding groove corresponding to the second guide shaft are opened on opposite sides of the sleeve body, and the limiting sleeve is limited between the first guide shaft and the second guide shaft; and The limiting sleeve is provided with accommodating holes on both sides adjacent to the slide groove, and each of the accommodating holes is connected to the first guide shaft and the second guide shaft. The rolling element is arranged corresponding to the accommodating holes and is partially exposed outside the accommodating holes.

6. The lens assembly according to claim 4, characterized in that: A second guide rail is arranged on the side of the focusing frame corresponding to the first guide rail, and the second guide rail includes a third guide shaft and a fourth guide shaft arranged in parallel and spaced apart; the rolling element close to one side of the focusing frame is squeezed and limited between the third guide shaft and the fourth guide shaft at the same time.

7. The lens assembly according to claim 2, characterized in that: The two ends of the focusing frame are respectively provided with a first limit end and a second limit end corresponding to the moving path of the rolling element, and the two ends of the pressing element are respectively provided with a third limit end and a fourth limit end corresponding to the moving path of the rolling element; the first limit end, the second limit end, the third limit end and the fourth limit end are all used to prevent the rolling element from escaping from the enclosed space.

8. The lens assembly according to claim 1, characterized in that: It also includes an axial hole structure; the axial hole structure includes an axial hole opened on the focusing frame, and a shaft arranged along the optical axis and having a clearance fit with the axial hole, the axial hole is arranged on the other side of the focusing frame opposite to the rolling structure, and both ends of the shaft are mounted on the frame; Wherein, the matching length between the shaft hole and the shaft rod in the optical axis direction is smaller than the thickness of the focusing frame.

9. The lens according to claim 1, characterized in that: A first limiting plane is provided at one end of the skeleton, and the first limiting plane is used to limit the movement of the focusing frame toward one end of the skeleton. A second limiting plane is provided at the other end of the skeleton, and the second limiting plane is used to limit the movement of the focusing frame toward the other end of the skeleton.

10. The lens according to claim 1, characterized in that: The four corners of the focusing frame are concave and extend along the optical axis to form four L-shaped limit grooves, and the inner side of the skeleton is provided with four abutment parts corresponding to the four L-shaped limit grooves at intervals; the four abutment parts are used to cooperate with the four L-shaped limit grooves to achieve the limitation of the movement of the focusing frame in the first direction and the second direction; the first direction and the second direction are directions perpendicular to the optical axis.

11. A lens, characterized in that: The lens comprises a lens assembly as described in any one of claims 1-10.

12. An image pickup device, characterized in that: The image pickup device includes a camera body and the lens as claimed in claim 11, wherein the lens is detachably connected to the camera body.

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