Focusing lens structure and assembling method thereof

Abstract

The invention provides a focusing lens structure and an assembling method thereof, and the structure comprises a plurality of fixed lens groups which are arranged side by side along a first axial direction, and adjusting gaps are disposed between the plurality of fixed lens groups; the adjustable lens group is movably arranged in the adjusting gap; and the multi-dimensional regulator is connected with the adjustable lens group and drives the adjustable lens group to move, so that the adjustable lens group axially moves along the first axial direction, radially moves along the radial direction perpendicular to the first axial direction or obliquely moves relative to the first axial direction. The problems that in a focusing lens in the prior art, the center deviation between a movable lens set and a fixed lens set cannot be adjusted, and the zooming range of a zooming system of an optical lens is limited are solved.

Description

Technical Field

[0001] The present application relates to the technical field of optical lenses, and more specifically, to a focusing lens structure and an assembly method thereof. Background Art

[0002] A focusing lens is an optical lens that can adjust the focal length. Existing focusing lenses usually have an interface on the outer diameter of a movable frame, a slide groove on a fixed lens barrel, and then a slider that matches the slide groove is made on the outside of the lens barrel. The slider passes through the slide groove on the lens barrel and is connected to the movable frame. The slider can realize the up and down movement of the movable frame. However, this structure cannot adjust the axial deviation between the movable frame and the fixed lens group. For details, please refer to the patent with publication number CN201156105Y and the name of a cam structure applied to a zoom lens. The movable frame in this patent can only rely on the inner wall of the lens barrel to determine its own center deviation. The center deviation between the movable frame and the fixed lens group cannot be adjusted, and the zoom range of the optical lens is limited.

[0003] Therefore, in the existing focusing lens, the center deviation between the movable lens group and the fixed lens group cannot be adjusted, and the zoom range of the zoom system of the optical lens is limited, which cannot meet the functional requirements of high-precision zoom adjustment of the optical lens. Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0004] The purpose of the present application is to provide a focusing lens structure and an assembly method thereof, which solves the problem that the center deviation between the movable lens group and the fixed lens group cannot be adjusted and the zoom range of the zoom system of the optical lens is limited in the focusing lens of the prior art.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In one aspect, the present application provides a focusing lens structure, comprising: a plurality of fixed lens groups, the plurality of fixed lens groups are arranged side by side along a first axial direction, and adjustment gaps are arranged between the plurality of fixed lens groups;

[0007] An adjustable mirror group, wherein the adjustable mirror group is movably arranged within an adjustment gap;

[0008] A multidimensional regulator is connected to the adjustable mirror group and drives the adjustable mirror group to move so that the adjustable mirror group moves axially along a first axis, moves radially along a radial direction perpendicular to the first axis, or moves obliquely relative to the first axis.

[0009] In an optional embodiment, the adjustable lens assembly includes: an adjustable lens frame, the adjustable lens frame extending in a radial direction perpendicular to the first axial direction and connected to the multi-dimensional adjuster;

[0010] A focusing lens is arranged on the adjustable lens frame and is located in the adjustment gap.

[0011] In an optional embodiment, the adjustable frame comprises:

[0012] A first supporting plate, the first supporting plate extending in a radial direction perpendicular to the first axial direction, and the focusing lens is arranged at one end of the first supporting plate;

[0013] The second support plate is arranged at the other end of the first support plate and forms a predetermined angle with the first support plate. The second support plate is fixedly connected to the movable frame of the multi-dimensional regulator.

[0014] In an optional embodiment, a plurality of fixed lens groups are arranged in the lens barrel along the first axial direction, and the lens barrel is an integrated lens barrel.

[0015] In an optional embodiment, a mounting opening is provided on the side wall of the lens barrel, and the adjustable lens group passes through the mounting opening and is located in the adjustment gap;

[0016] The plurality of fixed mirror groups include a fixed matching mirror group, and the fixed matching mirror group is adjacent to the adjustable mirror group;

[0017] An air-avoiding opening is provided on the fixed matching mirror group, and the adjustable mirror group is arranged in the air-avoiding opening.

[0018] In an optional embodiment, the focusing lens structure further includes: a bracket, on which the lens barrel is fixed;

[0019] The multi-dimensional regulator is arranged on the bracket and is located on one side of the lens barrel in the radial direction;

[0020] The multidimensional regulator is a five-dimensional regulator.

[0021] On the other hand, the present application provides an assembly method of a focusing lens structure, wherein the assembly method is applied to the focusing lens structure as described above, and comprises the steps of:

[0022] Adjusting the moving axis of the adjustable lens frame of the adjustable lens assembly in a one-dimensional motion state to be parallel to the mechanical center axis of the lens barrel, wherein the one-dimensional motion state is that the adjustable lens frame moves axially along a first axis under the drive of the multi-dimensional adjuster;

[0023] Adjusting the optical axes of the plurality of fixed lens groups so that the optical axes of the plurality of fixed lens groups coincide with the mechanical center axis of the lens barrel;

[0024] The optical axis of the adjustable mirror group is adjusted to coincide with the optical axis of the fixed mirror group, and the moving axis of the adjustable mirror group is adjusted to be parallel to the optical axis of the fixed mirror group.

[0025] In an optional embodiment, the step of aligning the motion axis of the adjustable lens frame of the adjustable lens assembly in a one-dimensional motion state to be parallel to the mechanical center axis of the lens barrel comprises:

[0026] Providing a first lens and an adjustable lens frame, and installing the first lens into the adjustable lens frame to form a reference adjustable lens group;

[0027] The lens barrel, the multi-dimensional adjuster and the reference adjustable lens group are mounted on the bracket and fixedly placed on the center deviation detection device through the center deviation detection tooling;

[0028] Place a flat crystal on the upper end surface of the lens barrel, inspect and adjust the lens barrel so that the mechanical center axis of the lens barrel is parallel to the center deviation detection optical axis;

[0029] The outer circle offset of the lens barrel in the rotating state is detected by a detection table, and the position of the lens barrel is adjusted according to the outer circle offset so that the mechanical center axis of the lens barrel coincides with the center deviation detection optical axis;

[0030] By moving the reference adjustable mirror group in a one-dimensional motion state, detecting the center deviation of the first predetermined distance to calculate the offset variation, and adjusting the position of the reference adjustable mirror group and the bracket according to the offset variation, so that the motion axis of the reference adjustable mirror group is parallel to the mechanical center axis of the lens barrel;

[0031] The center deviation of the first lens is detected, and the optical axis of the first lens is made to coincide with the center deviation detection optical axis through a multi-dimensional adjuster.

[0032] In an optional embodiment, the step of adjusting the optical axes of the plurality of fixed lens groups so that the optical axes of the plurality of fixed lens groups coincide with the mechanical center axis of the lens barrel comprises:

[0033] After recording the installation position of the adjustable lens frame of the reference adjustable lens assembly, remove the adjustable lens frame;

[0034] A plurality of fixed lens groups are installed in a lens barrel, and the center deviations of the plurality of fixed lens groups are detected by a center deviation detection device, and the optical axes of the plurality of fixed lens groups are adjusted to coincide with the mechanical center axis of the lens barrel.

[0035] In an optional embodiment, the step of aligning the optical axis of the adjustable mirror group with the optical axis of the fixed mirror group, and aligning the motion axis of the adjustable mirror group with the optical axis of the fixed mirror group comprises:

[0036] Take out the first lens of the reference adjustable lens group, and install the focusing lens on the adjustable lens frame to form an adjustable lens group;

[0037] According to the installation position of the adjustable frame, the adjustable frame is installed on the multi-dimensional adjuster;

[0038] By moving the adjustable mirror group in a one-dimensional motion state, detecting the offset variation of the center deviation of the second predetermined distance, and adjusting the position of the adjustable mirror group according to the offset variation, so that the offset variation is less than a predetermined standard value;

[0039] Detect the inclination of the optical axis of the focusing lens and the optical axis of the fixed lens group, and adjust the position of the adjustable lens group through the multi-dimensional regulator to make the optical axis of the focusing lens coaxial with the optical axis of the fixed lens group;

[0040] Fix the adjustable mirror group and the multi-dimensional adjuster.

[0041] The beneficial effects of a focusing lens structure and assembly method provided by the present application are at least that: by movably setting an adjustable lens group in the adjustment gap of multiple fixed lens groups, and driving the adjustable lens group through a multi-dimensional regulator, the adjustable lens group is axially moved along a first axis to achieve the function of focal length adjustment, and as long as the driving shaft of the multi-dimensional regulator driving the axial movement along the first axis is set larger, the adjustable lens group can be driven to move axially along the first axis for a larger distance, thereby achieving a zoom range of 40mm-60mm for the focusing lens. When the adjustable lens group is driven to move radially or / and tilted relative to the first axis by adjusting the multi-dimensional regulator, the center deviation between the optical axis of the adjustable lens group and the optical axis of the fixed lens group can be adjusted, so that the optical axis of the adjustable lens group is as coaxial as possible with the optical axis of the fixed lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic diagram of a focusing lens structure provided in an embodiment of the present application;

[0044] Figure 2 A schematic diagram of the structure of a focusing lens structure provided in an embodiment of the present application, in which a lens barrel and an adjustable lens group cooperate with each other;

[0045] Figure 3 A schematic diagram of the structure of a focusing lens structure provided in an embodiment of the present application when the lens barrel and the adjustable lens group are separated;

[0046] Figure 4 A cross-sectional view of a focusing lens structure provided in an embodiment of the present application;

[0047] Figure 5 A schematic flow chart of the main steps of an assembly method of a focusing lens structure provided in an embodiment of the present application;

[0048] Figure 6A schematic flow chart of detailed steps of an assembly method of a focusing lens structure provided in an embodiment of the present application;

[0049] Figure 7 A schematic structural diagram of a center deviation detection tool in an assembly method of a focusing lens structure provided in an embodiment of the present application;

[0050] Figure 8 A schematic structural diagram of a center deviation detection tool in use in an assembly method of a focusing lens structure provided in an embodiment of the present application.

[0051] Among them, the reference numerals in the figure are:

[0052] 100, bracket; 200, lens barrel; 201, installation opening; 210, fixed lens group; 211, fixed matching lens group; 220, adjustment gap; 300, adjustable lens group; 310, adjustable lens frame; 311, first support plate; 312, second support plate; 313, limit step; 320, focusing lens; 400, multi-dimensional regulator; 410, movable frame; 500, center deviation detection tooling; 510, bottom plate; 520, support rod; 530, upper support plate; 531, card hole; 532, opening. DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0055] Embodiment 1

[0056] See also Figure 1 , Figure 4The present embodiment provides a focusing lens structure, which mainly includes: a plurality of fixed lens groups 210, an adjustable lens group 300 and a multi-dimensional regulator 400. The plurality of fixed lens groups 210 are arranged side by side along a first axial direction, which is usually the light-incoming direction of the lens when in use, and an adjustment gap 220 is arranged between the plurality of fixed lens groups 210; usually, a predetermined gap is spaced between the fixed lens groups 210 according to design requirements, and an adjustment gap 220 is formed between two fixed lens groups 210 required by the design, and the fixed lens groups 210 located on both sides of the axial direction of the adjustment gap 220 are spaced by a predetermined distance, so that the adjustable lens group 300 is movably arranged in the adjustment gap 220, and the distance between the adjustable lens group 300 and the fixed lens groups 210 on both sides of the axial direction of the adjustment gap 220 is changed by the movement of the adjustable lens group 300. The multi-dimensional regulator 400 is connected to the adjustable lens group 300, and drives the adjustable lens group 300 to move so that the adjustable lens group 300 moves axially along the first axial direction, moves radially along a radial direction perpendicular to the first axial direction, or moves tilted relative to the first axial direction. A plurality of fixed lens groups 210 are fixedly arranged in the lens barrel 200. The lens barrel 200 may be a stepped lens barrel 200, and the first axial direction is also the mechanical center axis direction of the lens barrel 200. When the adjustable lens group 300 moves along the first axial direction (the mechanical center axis direction of the lens barrel 200) under the drive of the multi-dimensional adjuster 400, the focal length of the overall focusing lens structure can be adjusted; when the adjustable lens group 300 moves radially along a radial direction perpendicular to the first axial direction or moves tilted relative to the first axial direction (moves in pitch relative to the mechanical center axis direction of the lens barrel 200), the center deviation between the optical axis of the adjustable lens group and the optical axis of the fixed lens group 210 can be adjusted.

[0057] See also Figure 1 , Figure 4 In the focusing lens structure of this embodiment, the adjustable lens group 300 is movably arranged in the adjustment gap 220 of the plurality of fixed lens groups 210, and the adjustable lens group 300 is driven by the multi-dimensional regulator 400 to make the adjustable lens group 300 move axially along the first axial direction to achieve the function of focal length adjustment, and as long as the driving shaft of the multi-dimensional regulator 400 driving the axial movement along the first axial direction is set larger, the adjustable lens group 300 can be driven to move axially along the first axial direction for a larger distance, thereby achieving the zoom range of the focusing lens within 40mm-60mm. When the adjustable lens group 300 is driven to move radially or / and tilt relative to the first axial direction by the multi-dimensional regulator 400, the center deviation between the optical axis of the adjustable lens group 300 and the optical axis of the fixed lens group 210 can be adjusted, so that the optical axis of the adjustable lens group 300 is as coaxial as possible with the optical axis of the fixed lens group 210.

[0058] See also Figure 1 , Figure 2, further, the adjustable lens assembly 300 of this embodiment specifically includes: an adjustable lens frame 310 and a focusing lens 320. The adjustable lens frame 310 extends in a radial direction perpendicular to the first axial direction and is connected to the multi-dimensional regulator 400; the focusing lens 320 is arranged on the adjustable lens frame 310 and is located in the adjustment gap 220. In the specific structure, the adjustable lens frame 310 provides a mounting position for the focusing lens 320, so that the focusing lens 320 can be stably fixed on the adjustable lens frame 310, and the adjustable lens frame 310 extends in a radial direction toward the outside of the adjustment gap 220 and is connected to the multi-dimensional regulator 400, which does not affect the optical path of the entire lens.

[0059] See also Figure 1 , Figure 2 , Figure 3 Furthermore, the adjustable lens frame 310 of this embodiment specifically includes: a first support plate 311 and a second support plate 312. The first support plate 311 extends in a radial direction perpendicular to the first axial direction, and has an inner end facing the adjustment gap 220, and an outer end extending out of the adjustment gap 220. A mounting through hole is provided on the inner end of the first support plate 311, and the focusing lens 320 is fixedly mounted in the mounting through hole of the inner end. The second support plate 312 is arranged at the other end of the first support plate 311, and is at a predetermined angle with the first support plate 311. The second support plate 312 is fixedly connected to the movable frame 410 of the multi-dimensional regulator 400. In the specific structure, the predetermined angle can be an acute angle, a right angle or an obtuse angle, and the adjustment gap 220 only needs to be extended radially. The predetermined angle of this embodiment is a right angle, so the second support plate 312 is perpendicular to the first support plate 311, and the adjustable frame 310 is designed to be L-shaped. The second support plate 312 can be a square plate with an aspect ratio between 0.8-1.2, so that the second support plate 312 is similar to a square plate. When the second support plate 312 is overlapped and fixedly connected with the movable frame 410 of the multidimensional regulator 400, the second support plate 312 and the movable frame 410 of the multidimensional regulator 400 have a relatively large contact area, thereby ensuring the structural stability.

[0060] See also Figure 2 , Figure 3 In this embodiment, the second support plate 312 and the first support plate 311 have different thicknesses in the first axial direction, so that a limiting step 313 is formed at the connection between the second support plate 312 and the first support plate 311 (there is a height difference between the rear surfaces of the two); when the second support plate 312 and the movable frame 410 of the multi-dimensional adjuster 400 are installed, the inner end portion (rear surface) of the first support plate 311 can be abutted against the frame of the adjacent fixed lens group 210, so that the limiting step 313 abuts against the outer edge of the fixed lens group 210, thereby serving as a positioning reference, so that the adjustable lens frame 310 is located in the adjustment gap 220 for preliminary positioning, which facilitates assembly and greatly saves debugging time.

[0061] See also Figure 1 , Figure 4 Furthermore, the lens barrel 200 of this embodiment is an integrated lens barrel 200, and a plurality of fixed lens groups 210 are arranged along the mechanical center axis direction of the lens barrel 200 and fixedly arranged in the integrated lens barrel 200. Each fixed lens group 210 is formed by a fixed lens set on a fixed lens frame, and each fixed lens group 210 is directly assembled into the integrated lens barrel 200 in sequence, and the fixed lens group 210 can be fixed in the integrated lens barrel 200 by gluing. In this embodiment, four fixed lens groups 210 are arranged in sequence in the integrated lens barrel 200 at intervals, and the adjustable lens group 300 is located between the second and third fixed lens groups 210. The use of an integrated lens barrel 200 to install multiple fixed lens groups 210 can ensure that the fixed lens group 210 is installed in the lens barrel 200. The assembled lens is improved so that the deviation between the central axis of each fixed lens group 210 and the mechanical central axis of the lens barrel 200 is not large, thereby ensuring the high precision of the fixed lens group 210 and the lens barrel 200, making the deviation accuracy within 5um and the tilt accuracy within 30 seconds.

[0062] See also Figure 1 , Figure 4 Further, a mounting opening 201 is provided on the side wall of the lens barrel 200 of the present embodiment, and the adjustable lens group 300 passes through the mounting opening 201 and is located in the adjustment gap 220; the area in the lens barrel 200 corresponding to the mounting opening 201 can be considered as the area of ​​the adjustment gap 220. The lens group adjacent to the adjustable lens group 300 in the plurality of fixed lens groups 210 is a fixed matching lens group 211, for example, the second fixed lens group 210 in the present embodiment is a fixed matching lens group 211, and an air-avoiding opening is provided on the outer wall of the lens frame of the fixed matching lens group 211, and the adjustable lens group 300 is arranged in the air-avoiding opening. The air-avoiding opening on the fixed matching lens group 211 is matched with the mounting opening 201 on the side wall of the lens barrel 200, and the two are of the same size and width and aligned in position, so that an opening of a certain width can be provided on the lens barrel 200 along the first axis, so that the adjustable lens group 300 can move stably in the opening.

[0063] See also Figure 3 , Figure 4 It should be noted that, since an installation opening 201 is provided on the side wall of the lens barrel 200 and an air-avoiding opening is provided on the fixed matching lens group 211, a plane (the rear edge of the opening) is formed on the opening side of the lens barrel 200, and positioning is formed by abutting the plane against the limiting step 313, which facilitates the positioning and installation of the adjustable lens frame 310.

[0064] See also Figure 1Furthermore, the focusing lens structure of the present embodiment further comprises: a bracket 100, a lens barrel 200 is fixed on the bracket 100, and a multi-dimensional adjuster 400 is arranged on the bracket 100 and is located on one side of the radial direction of the lens barrel 200. The multi-dimensional adjuster 400 of the present embodiment is a five-dimensional adjuster. The five-dimensional adjuster is fixed on the bracket 100, and has a movable frame 410. When the five-dimensional adjuster is adjusted, the movable frame 410 is usually movable, and the movable frame 410 is located on the outer side of the mounting opening 201 on the side wall of the lens barrel 200. Therefore, when the adjustable lens group 300 is fixed on the movable frame 410, it is moved and rotated in multiple directions by starting the five-dimensional adjuster.

[0065] Embodiment 2

[0066] See also Figure 5 The present application proposes an assembly method of a focusing lens structure, wherein the assembly method is applied to the focusing lens structure as described above, and comprises the steps of:

[0067] Step S100, aligning the moving axis of the adjustable lens frame of the adjustable lens assembly in a one-dimensional motion state to be parallel to the mechanical center axis of the lens barrel, wherein the one-dimensional motion state is that the adjustable lens frame moves axially along a first axis under the drive of a multi-dimensional adjuster.

[0068] Among them, the one-dimensional motion state refers to movement along the mechanical center axis direction of the lens barrel (the first axial direction), and the standard is achieved by adjusting the trajectory of the axial movement of the multi-dimensional adjuster along the first axial direction to be parallel to the mechanical center axis of the lens barrel, wherein the standard can be: the adjustable lens group moves 20mm along the first axial direction and the offset change is less than 5μm.

[0069] See also Figure 5 , Figure 6 In the specific process, step S100 specifically includes steps S110 to S160, which are as follows:

[0070] Step S110: providing a first lens and an adjustable lens frame, and installing the first lens into the adjustable lens frame to form a reference adjustable lens assembly.

[0071] A plano-convex / plano-concave lens is prepared as the first lens, and the first lens is used as a reference lens only during the assembly and adjustment process. The diameter of the first lens is greater than 15 mm and less than 20 mm. Taking the table of the first lens as a reference, its optical axis offset is required to be less than 5 um and the tilt is less than 20″. The adjustable frame is pre-processed, and the lens receiving surface of the adjustable frame is finely processed to ensure that its flatness is less than 0.01 mm. The first lens is installed in the adjustable frame so that the table of the first lens contacts the frame receiving surface of the adjustable frame, thereby ensuring the assembly accuracy.

[0072] Step S120: Install the lens barrel, the multi-dimensional adjuster and the reference adjustable lens group on the bracket, and fix them on the center deviation detection device through the center deviation detection tooling.

[0073] Among them, see Figure 7 , Figure 8 The specific structure of the center deviation detection tool 500 includes: a base plate 510, a plurality of support rods 520 and an upper support plate 530. The plurality of support rods 520 are arranged on the base plate 510 and surround to form an accommodation space, the upper support plate 530 is arranged on the top of the plurality of support rods 520, and a card embedding hole 531 is provided on the upper support plate 530. When the tool is used, the lens barrel 200 is inserted into the card embedding hole 531 from top to bottom, and the bracket 100 is pressed against the upper surface of the upper support plate 530, so that the lens barrel 200 is inserted in the accommodation space and suspended in the up-down direction. In order to support the lens barrel 200 and the bracket 100 more stably, the card embedding hole 531 is arranged at the edge of the upper support plate 530 and an opening 532 is formed at the edge, and the width of the opening 532 is smaller than the diameter of the card embedding hole 531, so that the lens barrel 200 is convenient to insert.

[0074] After the lens barrel 200, the multi-dimensional adjuster 400 and the reference adjustable lens group are installed on the bracket 100, the bracket 100 is installed on the center deviation detection tooling 500, so that the lens barrel 200 is arranged in the up and down direction and fixedly placed on the center deviation detection device for optical axis detection.

[0075] Step S130, placing a flat crystal on the upper end surface of the lens barrel, inspecting and adjusting the lens barrel so that the mechanical center axis of the lens barrel is parallel to the center deviation detection optical axis.

[0076] Step S140, detecting the outer circle offset of the lens barrel in the rotating state by using a detection table, and adjusting the position of the lens barrel according to the outer circle offset so that the mechanical center axis of the lens barrel coincides with the center deviation detection optical axis.

[0077] Among them, a micrometer is used to be close to the outer diameter of the upper end of the lens barrel, and the rotating platform drives the lens barrel on the center deviation detection tooling to rotate, so that the offset between the center of the lens barrel and the rotation center can be read, and the center deviation detection tooling is adjusted according to the offset, and then the position of the lens barrel is adjusted, so that the mechanical center axis of the lens barrel coincides with the center deviation detection optical axis.

[0078] Step S150, by moving the reference adjustable mirror group in a one-dimensional motion state, detecting the center deviation of the first predetermined distance to calculate the offset variation, and adjusting the position of the reference adjustable mirror group and the bracket according to the offset variation, so that the motion axis of the reference adjustable mirror group is parallel to the mechanical center axis of the lens barrel.

[0079] The reference adjustable mirror group is moved up and down (along the first axial direction) by the multidimensional adjuster to detect the center deviation of a first predetermined distance (the first predetermined distance may be 15 mm), and the offset change is calculated according to the detected center deviation. By adjusting the connection position of the reference adjustable mirror group relative to the bracket (specifically, the connection position relative to the bracket can be adjusted by adjusting the position of the reference adjustable mirror group on the multidimensional adjuster), the movement axis in the one-dimensional motion state is made parallel to the mechanical center axis of the lens barrel, that is, the detection change is required to be less than 5 μm.

[0080] Step S160, detecting the center deviation of the first lens, and making the optical axis of the first lens coincide with the center deviation detection optical axis through the multi-dimensional regulator. Wherein, detecting the center deviation of the first lens, and making the optical axis of the first lens coincide with the center deviation detection optical axis through the multi-dimensional regulator.

[0081] Step S200, adjusting the optical axes of the plurality of fixed lens groups so that the optical axes of the plurality of fixed lens groups coincide with the mechanical center axis of the lens barrel.

[0082] In this process, the optical axis of the fixed lens group is adjusted to coincide with the mechanical center axis of the lens barrel. The coincidence standard may be: the eccentricity is less than 5 μm and the angle is less than 20″.

[0083] See also Figure 5 , Figure 6 In the specific process, step S200 specifically includes steps S210 to S220, which are as follows:

[0084] Step S210, after recording the installation position of the adjustable lens frame of the reference adjustable lens assembly, the adjustable lens frame is removed.

[0085] Step S220: install multiple fixed lens groups into the lens barrel, detect the center deviations of the multiple fixed lens groups according to the center deviation detection device, and adjust them so that the optical axes of the multiple fixed lens groups coincide with the mechanical center axis of the lens barrel.

[0086] In the above process, the installation position of the adjustable lens frame is recorded, and then the adjustable lens frame is removed. All the fixed lens groups that have been independently adjusted and fixed are installed, and the center deviation of the fixed lens group is detected on the center deviation detection equipment. The optical axis of the fixed lens group and the mechanical center axis of the lens barrel are adjusted to meet the coincidence standard, that is, the eccentricity between the optical axis of the fixed lens group and the mechanical center axis of the lens barrel is less than 5μm, and the angle is less than 20″.

[0087] Step S300: adjust the optical axis of the adjustable lens group to coincide with the optical axis of the fixed lens group, and adjust the moving axis of the adjustable lens group to be parallel to the optical axis of the fixed lens group.

[0088] In this process, the first lens is replaced by the focusing lens to form an adjustable lens group, and after adjustment, the optical axis of the focusing lens is made coaxial with the optical axis of the fixed lens group. The coaxial standard may be: eccentricity less than 5 μm, tilt less than 20″.

[0089] See also Figure 5 , Figure 6 In the specific process, step S300 specifically includes steps S310 to S350, which are as follows:

[0090] Step S310: Take out the first lens of the reference adjustable lens group, and install the focusing lens on the adjustable lens frame to form an adjustable lens group.

[0091] Step S320: Install the adjustable frame on the multi-dimensional adjuster according to the installation position of the adjustable frame.

[0092] In the above process, the first lens is taken out from the adjustable lens frame of the reference adjustable lens group, and then the focusing lens is placed on the adjustable lens frame to form an adjustable lens group. According to the installation position of the adjustable lens frame marked in step S220, the adjustable lens frame is installed on the multi-dimensional adjuster again.

[0093] Step S330, detecting the offset variation of the center deviation at a second predetermined distance by moving the adjustable mirror assembly in a one-dimensional motion state, and adjusting the position of the adjustable mirror assembly according to the offset variation so that the offset variation is less than or equal to a predetermined standard value.

[0094] Specifically, the adjustable mirror group is moved up and down (along the first axial direction) by a multidimensional adjuster, and the center deviation of a second predetermined distance (the second predetermined distance may be 15 mm) is detected. The offset change is calculated based on the detected center deviation, and the adjustable mirror group is fine-tuned by fine-tuning the multidimensional adjuster according to the offset change until the offset change is less than or equal to 5 μm.

[0095] Step S340, detecting the inclination of the optical axis of the focusing lens and the optical axis of the fixed lens group, and adjusting the position of the adjustable lens group by a multi-dimensional regulator to make the optical axis of the focusing lens coaxial with the optical axis of the fixed lens group.

[0096] Step S350: fix the adjustable mirror assembly and the multi-dimensional adjuster.

[0097] In the above steps, the inclination of the optical axis of the focusing lens and the optical axis of the fixed lens group is detected, and the adjustable lens group is fine-tuned in other dimensions other than the one-dimensional motion state by the multi-dimensional regulator to make the optical axis of the focusing lens coaxial with the optical axis of the fixed lens group. The coaxial standard can be: eccentricity less than 5μm, inclination less than 20″. Fix after completion.

[0098] In summary, the present application provides a focusing lens structure and an assembly method, through which a wide range of zoom range (40-60mm) can be obtained. In addition, the focusing lens can perform stable and high-precision zooming, so that the optical axis offset of the lens barrel is within 8um and the tilt is within 30 seconds.

[0099] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A focusing lens structure, characterized in that: include: A plurality of fixed mirror groups, wherein the plurality of fixed mirror groups are arranged side by side along a first axial direction, and adjustment gaps are arranged between the plurality of fixed mirror groups; An adjustable mirror group, wherein the adjustable mirror group is movably arranged in the adjustment gap; A multidimensional regulator is connected to the adjustable mirror group and drives the adjustable mirror group to move so that the adjustable mirror group can move axially along the first axis, move radially along a radial direction perpendicular to the first axis, or move obliquely relative to the first axis.

2. The focusing lens structure according to claim 1, characterized in that: The adjustable lens assembly comprises: an adjustable lens frame, the adjustable lens frame extends in a radial direction perpendicular to the first axial direction and is connected to the multi-dimensional regulator; A focusing lens is arranged on the adjustable lens frame and is located in the adjustment gap.

3. The focusing lens structure according to claim 2, characterized in that: The adjustable mirror frame comprises: A first support plate, wherein the first support plate extends in a radial direction perpendicular to the first axial direction, and the focusing lens is arranged at one end of the first support plate; The second support plate is arranged at the other end of the first support plate and forms a predetermined angle with the first support plate. The second support plate is fixedly connected to the movable frame of the multi-dimensional regulator.

4. The focusing lens structure according to claim 1, characterized in that: The plurality of fixed lens groups are arranged in the lens barrel along a first axial direction, and the lens barrel is an integrated lens barrel.

5. The focusing lens structure according to claim 4, characterized in that: A mounting opening is provided on the side wall of the lens barrel, and the adjustable lens group passes through the mounting opening and is located in the adjustment gap; The plurality of fixed mirror groups include a fixed matching mirror group, and the fixed matching mirror group is adjacent to the adjustable mirror group; An air-avoiding opening is provided on the outer wall of the lens frame of the fixed matching lens group, and the adjustable lens group is arranged in the air-avoiding opening.

6. The focusing lens structure according to claim 4, characterized in that: The focusing lens structure further comprises: a bracket, and the lens barrel is fixed on the bracket; The multi-dimensional regulator is arranged on the bracket and is located on one side of the radial direction of the lens barrel; The multi-dimensional regulator is a five-dimensional regulator.

7. A method for assembling a focusing lens structure, characterized in that: Applied to the focusing lens structure according to any one of claims 4 to 6, the assembly method comprises the steps of: Adjusting the moving axis of the adjustable lens frame of the adjustable lens assembly in a one-dimensional motion state to be parallel to the mechanical center axis of the lens barrel, wherein the one-dimensional motion state is that the adjustable lens frame moves axially along the first axial direction under the drive of the multi-dimensional adjuster; Adjusting the optical axes of the plurality of fixed lens groups so that the optical axes of the plurality of fixed lens groups coincide with the mechanical center axis of the lens barrel; The optical axis of the adjustable mirror group is adjusted to coincide with the optical axis of the fixed mirror group, and the moving axis of the adjustable mirror group is adjusted to be parallel to the optical axis of the fixed mirror group.

8. The method for assembling a focusing lens structure according to claim 7, wherein: The step of aligning the motion axis of the adjustable lens frame of the adjustable lens assembly in a one-dimensional motion state to be parallel to the mechanical center axis of the lens barrel comprises: Providing a first lens and an adjustable lens frame, and installing the first lens into the adjustable lens frame to form a reference adjustable lens assembly; The lens barrel, the multi-dimensional adjuster and the reference adjustable lens group are mounted on a bracket and fixedly placed on a center deviation detection device through a center deviation detection tool; Placing a flat crystal on the upper end surface of the lens barrel, detecting and adjusting the lens barrel so that the mechanical center axis of the lens barrel is parallel to the center deviation detection optical axis; The outer circle offset of the lens barrel in the rotating state is detected by a detection table, and the position of the lens barrel is adjusted according to the outer circle offset so that the mechanical center axis of the lens barrel coincides with the center deviation detection optical axis; By moving the reference adjustable mirror group in a one-dimensional motion state, detecting the center deviation of the first predetermined distance to calculate the offset variation, and adjusting the position of the reference adjustable mirror group and the bracket according to the offset variation, so that the motion axis of the reference adjustable mirror group is parallel to the mechanical center axis of the lens barrel; The center deviation of the first lens is detected, and the optical axis of the first lens is made to coincide with the center deviation detection optical axis through a multi-dimensional adjuster.

9. The method for assembling a focusing lens structure according to claim 8, wherein: The step of adjusting the optical axes of the plurality of fixed lens groups so that the optical axes of the plurality of fixed lens groups coincide with the mechanical center axis of the lens barrel comprises: After recording the installation position of the adjustable lens frame of the reference adjustable lens assembly, removing the adjustable lens frame; A plurality of fixed lens groups are installed in the lens barrel, and the center deviations of the plurality of fixed lens groups are detected by a center deviation detection device, and the optical axes of the plurality of fixed lens groups are adjusted to coincide with the mechanical center axis of the lens barrel.

10. The method for assembling a focusing lens structure according to claim 9, wherein: The steps of aligning the optical axis of the adjustable mirror group with the optical axis of the fixed mirror group, and aligning the motion axis of the adjustable mirror group with the optical axis of the fixed mirror group to be parallel include: Taking out the first lens of the reference adjustable lens group, and installing a focusing lens on the adjustable lens frame to form an adjustable lens group; According to the installation position of the adjustable frame, the adjustable frame is installed on the multi-dimensional adjuster; By moving the adjustable mirror group in a one-dimensional motion state, detecting the offset variation of the center deviation separated by a second predetermined distance, and adjusting the position of the adjustable mirror group according to the offset variation, so that the offset variation is less than a predetermined standard value; Detecting the inclination of the optical axis of the focusing lens and the optical axis of the fixed lens group, and adjusting the position of the adjustable lens group by the multi-dimensional regulator to make the optical axis of the focusing lens coaxial with the optical axis of the fixed lens group; The adjustable mirror group and the multi-dimensional regulator are fixed.

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