Lens seat and assembly tool thereof

Abstract

The invention discloses a lens seat and an assembling tool thereof, the lens seat is fixedly installed in a lens barrel so that a lens in the lens seat can be kept balanced along the optical axis direction of the lens when the temperature changes, and the lens seat comprises a seat installation part, a seat movable part, a wedge-shaped ring and a plurality of elastic connecting mechanisms; wherein a lens is mounted in the center of the seat movable part; the wedge-shaped ring is expanded or compressed when the temperature changes, so that the inner diameter of the wedge-shaped ring is increased or decreased, and the relative distance between the seat movable part and the seat mounting part is changed, so that the lens is driven to move along the optical axis direction of the lens, and the offset of the seat mounting part driven by the lens cone when the temperature changes is counteracted; according to the invention, the wedge-shaped ring with a high expansion coefficient is arranged, so that the wedge-shaped ring deforms synchronously when the lens cone deforms along with the temperature change, and the elastic connecting mechanism is matched with the seat mounting part, the seat moving part and the elastic connecting mechanism to synchronously drive the lens on the seat moving part to change relative to the position of a reference point on the lens cone; therefore, the distance change between the lens and the reference point position caused by the deformation of the lens cone is compensated.

Description

Technical Field

[0001] The invention belongs to the field of machine vision, and in particular relates to a lens holder and an assembly tool thereof. Background Art

[0002] In optical imaging systems, the lens barrel serves as a critical structural component that supports and positions the lenses. Its thermal stability directly impacts the lens's imaging performance. Because the lens barrel material typically has a non-zero coefficient of thermal expansion, changes in ambient temperature cause the barrel to deform due to thermal expansion and contraction. This can cause the actual position of each lens within the barrel to shift relative to the mechanical reference point on the barrel. This shift alters the designed spacing between the lenses, in turn affecting key lens parameters such as the effective focal length (EFL), image plane position, and optical aberrations (such as spherical aberration, field curvature, and chromatic aberration). Ultimately, this can lead to degraded image quality, such as image blur, reduced resolution, or decreased image acquisition stability (due to thermal drift or calibration failure).

[0003] This problem is particularly pronounced in precision optical systems (such as high-resolution cameras, microscope objectives, and telescopes). For example, in operating environments with large temperature gradients, local expansion or contraction of the lens barrel can cause lens tilt or decentration, further degrading optical performance. In multi-optical systems (such as interferometers and spectrometers), variations in lens spacing can also lead to optical path misalignment, affecting image synthesis accuracy or signal stability. Therefore, suppressing or compensating for the effects of lens barrel thermal deformation on optical systems has become a key challenge in the field of high-precision optical design.

[0004] Currently common solutions include the use of low-expansion materials (such as Invar alloy and microcrystalline glass) or active temperature control technology (such as thermoelectric cooling and closed-loop feedback) to maintain the stability of lens spacing and ensure the performance consistency of the optical system over the entire temperature range.

[0005] While existing technologies employ low-expansion materials or temperature control to compensate for thermal deformation of the lens barrel, significant shortcomings remain: the materials cannot completely eliminate expansion, passive compensation accuracy is limited, and active temperature control response is delayed and costly. More critically, existing methods only adjust the lens barrel as a whole and cannot independently control the position of individual lenses. This leads to cumulative spacing errors in multi-lens systems and makes it difficult to correct for lens position changes caused by local deformation. A compensation solution that can independently adjust lens position is urgently needed to improve optical stability in variable temperature environments.

[0006] Therefore, in order to solve the above problems, the present invention provides a lens holder and an assembly tool thereof. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above problems existing in the prior art and provide a lens holder and an assembly tool thereof.

[0008] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions: A lens holder is fixedly mounted in a lens barrel so that the lens in the lens holder remains balanced along the optical axis of the lens when the temperature changes. The lens holder includes: The seat mounting portion is annular in structure, with its circumference connected to the inner wall of the lens barrel by threads, one end of which is provided with an inwardly concave connecting groove to drive the seat mounting portion to rotate along the end of the lens barrel to a predetermined position, and the other end of which is provided with a first sliding abutment surface on the inner or outer side; The seat movable portion is slidably connected to the peripheral side of the seat mounting portion, and is provided with a second sliding abutment surface corresponding to the first sliding abutment surface on the inner side or outer side near one end of the seat mounting portion; The wedge ring includes a first sliding curved surface that is in sliding contact with the first sliding contact surface and a second sliding curved surface that is in sliding contact with the second sliding contact surface; A plurality of elastic connection mechanisms, passing through the seat movable portion and connected to the seat mounting portion, are used to continuously and elastically press the seat movable portion to approach the seat mounting portion so that the wedge ring is tightly connected to the first sliding abutment surface and the second sliding abutment surface respectively, thereby limiting the movement of the wedge ring along its axial direction; Among them, a lens is installed in the center of the seat movable part; the wedge ring expands or compresses when the temperature changes, causing its inner diameter to increase or decrease, thereby changing the relative distance between the seat movable part and the seat mounting part, so as to drive the lens to move along the optical axis of the lens, so as to offset the offset of the seat mounting part driven by the lens barrel when the temperature changes.

[0009] Furthermore, a first annular protrusion is provided at the center of the other end of the seat mounting portion opposite to the inwardly concave connecting groove to fix the elastic connecting mechanism; A second annular protrusion is provided on the seat movable portion near the center of one end of the seat mounting portion for mounting the elastic connecting mechanism; There are gaps between the wedge ring and the first annular protrusion and the second annular protrusion to prevent the wedge ring from contacting the first annular protrusion and the second annular protrusion when the temperature changes.

[0010] Furthermore, the elastic connection mechanism includes: a positioning bolt passing through the second annular protrusion and being threadedly connected to the first annular protrusion; The two ends of the compression spring respectively abut against the end of the positioning bolt and the seat movable part to continuously and elastically compress the seat movable part.

[0011] Furthermore, the first sliding curved surface and the second sliding curved surface satisfy the following relationship: ; Wherein, L0 is the distance between the seat mounting portion and the reference point on the lens barrel, α is the thermal expansion coefficient of the lens barrel, R is the inner diameter of the wedge ring, β is the thermal expansion coefficient of the wedge ring, θ1 is the angle formed by the first sliding surface and the axis of the wedge ring, and θ2 is the angle formed by the second sliding surface and the axis of the wedge ring.

[0012] Furthermore, the first sliding abutment surface is provided by a first abutment ring, which is engaged on the seat mounting portion; The second sliding abutment surface is provided by a second abutment ring, which is engaged on the seat movable portion.

[0013] Furthermore, the cross-section of the wedge ring is an isosceles triangle structure, so that the angle formed by the first sliding curved surface and the axis of the wedge ring is equal to the angle formed by the second sliding curved surface and the axis of the wedge ring.

[0014] The present invention also provides a lens holder assembly tool for cooperating with and installing the lens holder, comprising: A supporting platform, used for supporting and placing a lens seat; The spiral limiter is installed on the support platform in the vertical direction and consists of a limit connection part at the top and a sliding limit part at the bottom. The limit connection part is inserted into the concave connection groove and is magnetically connected to the seat mounting part. The coaxial mounting mechanism includes two V-shaped blocks that are distributed opposite to each other and move synchronously toward or away from each other along the support platform to limit the position of the wedge ring so that the wedge ring is coaxially mounted on the seat mounting portion; The screw drive mechanism includes a rotating connector and a power assembly connected to each other, wherein the rotating connector is slidably connected to the sliding limiter in the vertical direction and limits the free rotation of the sliding limiter in the horizontal direction; the power assembly is used to drive the rotating connector to rotate, thereby driving the lens holder to screw into the lens barrel; The lens barrel lifting mechanism is used to vertically place the lens barrel and drive the lens barrel to move in the vertical direction to approach the top end of the peripheral side of the seat mounting part, so as to be threadedly connected with the lens barrel when the seat mounting part rotates.

[0015] Furthermore, the power assembly is composed of a worm gear structure, wherein one end of the worm is connected to the power source, and the worm gear is installed horizontally at the bottom of the rotating connection; A rotating connection cylinder is provided at the top of the rotating connection piece and is connected to the sliding limit part in a vertical sliding direction. A limiting groove or a limiting protrusion is provided inside the rotating connection cylinder for limiting the free rotation of the sliding limit part.

[0016] Furthermore, a magnetic sheet is fixedly mounted on the top of the position-limiting connection portion, and the bottom end is position-limitedly engaged with the top surface of the support platform; The sliding limiting portion passes through the supporting platform and is cooperatively connected with the top end of the rotating connecting piece.

[0017] Furthermore, one end of the worm is connected to a servo motor, and the control conditions of the servo motor satisfy the following relationship: ; Among them, N1 is the number of revolutions of the worm driven by the servo motor, z1 is the number of worm heads, z2 is the number of worm gear teeth, ΔL is the stepping distance of the lens mount, and P is the pitch of the thread between the lens mount and the lens barrel.

[0018] The beneficial effects of the present invention are: (1) In the present invention, a wedge ring with a high expansion coefficient is provided so that the wedge ring is deformed synchronously when the lens barrel is deformed with temperature changes. In conjunction with the relative sliding between the seat mounting portion and the seat movable portion, the wedge ring is driven to abut between the seat mounting portion and the seat movable portion through an elastic connection mechanism, so that the seat movable portion is driven to move closer to or away from the seat mounting portion through the deformation of the wedge ring, and the position of the lens on the seat movable portion relative to the reference point on the lens barrel is changed synchronously to compensate for the change in the distance between the lens and the reference point caused by the deformation of the lens barrel, thereby ensuring that the relative position of each lens and the reference point remains unchanged, so that the lens system composed of several lenses maintains stable image acquisition performance, and reduces the influence of the lens barrel deformation caused by temperature changes on the lens image acquisition effect.

[0019] (2) In the present invention, by arranging corresponding first sliding abutment surfaces and second sliding abutment surfaces on the inner side or outer side of the seat mounting portion and the seat movable portion, the seat mounting portion and the seat movable portion are controlled to be located on the inner side or outer side of the wedge ring, and then the wedge ring is controlled to synchronously drive the seat movable portion to approach or move away from the seat mounting portion, so as to control the lens to approach or move away from the reference point position of the lens barrel as the seat movable portion moves, so as to adaptively select the displacement compensation direction of each lens according to the setting position of the lens relative to the reference point, thereby realizing independent control of the displacement compensation direction of each lens, which has strong practicality.

[0020] (3) In the present invention, one end of the positioning bolt is fixedly connected to the first annular protrusion by means of the threaded cooperation of the first external thread and the first internal thread, so that the position of the seat mounting portion and the elastic connection mechanism is relatively fixed, and the position of the seat movable portion and the elastic connection mechanism can move relative to each other when the wedge ring is deformed by means of the sliding connection between the bolt rod and the second annular connection groove, thereby converting the deformation of the wedge ring into the relative displacement of the seat movable portion and the seat mounting portion, so as to drive the position of the lens relative to the reference point on the lens barrel to change, thereby reversely compensating for the displacement of the lens caused by the deformation of the lens barrel due to temperature change, and reducing the influence of temperature change on the imaging quality of the optical lens.

[0021] (4) In the present invention, the assembly tooling of the lens seat specifically includes the following steps: first, the spiral limiter is accurately positioned at the specified position of the support platform by using the limiting connection part, the positioning of the seat mounting part is achieved by the cooperation between the inner concave connection groove and the limiting connection part, and the displacement of the lens seat and the spiral limiter in the horizontal and vertical directions is further constrained by the magnetic connection method; then, the first abutment ring is embedded and installed on the seat mounting part, and the radial space of the wedge ring is compressed by driving the two V-blocks of the coaxial mounting mechanism to approach synchronously to ensure that the wedge ring and the first abutment ring are coaxially abutted; after completing the above operations, the tooling is removed. The V-shaped block fits the seat movable part with the second abutment ring on the wedge ring, and finally the seat mounting part, the wedge ring and the seat movable part are locked and connected by an elastic connection mechanism to complete the lens seat assembly; during the rotary feed assembly process, the lens barrel is first driven down to a position where its thread is aligned with the lens seat by the lens barrel lifting mechanism, and then the spiral drive mechanism controls the power assembly to drive the rotary connector to rotate. Through the vertical sliding cooperation between the rotary connector and the sliding limiter, and the magnetic connection between the spiral limiter and the seat mounting part, the lens seat is driven to perform rotary feed motion to achieve its threaded connection with the lens barrel. The present invention ensures that the lens seat can achieve precise rotary feed motion under the drive of the power assembly through the magnetic connection and mutual limiting relationship between the spiral limiter and the seat mounting part, and realizes the automated assembly of the threaded connection between the lens seat and the lens barrel, which has significant practical value.

[0022] (5) In the present invention, the transmission ratio of the worm gear is used to obtain the relationship between the worm rotation angle and the worm gear rotation angle, and the rotation angle of the lens holder is obtained based on the worm gear rotation angle. The relative displacement of the lens holder and the lens barrel is calculated according to the pitch of the connecting thread between the lens holder and the lens barrel, and the stepping distance of the lens holder is obtained. The rotation angle of the worm gear structure is controlled by the servo motor, and the displacement distance of the lens holder in the lens barrel is accurately controlled to ensure that each lens holder is installed in place, thereby improving the installation accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a sectional view of the three-dimensional structure of the lens holder of the present invention; Figure 2 is a planar structural sectional view of the lens holder of the present invention; Figure 3 This is an exploded view of the structure of the lens holder of the present invention; Figure 4 This is an exploded view of the lens holder structure from another perspective of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the assembly tool in the present invention; Figure 6 It is a schematic diagram of a partial three-dimensional structure of the assembly tool in the present invention; Figure 7 It is a structural schematic diagram of the spiral limiter and the spiral drive mechanism in the present invention; Figure 8 This is a partial structural exploded view of the spiral limiter and the spiral drive mechanism in the present invention; Figure 9 This is a partial structural exploded view of the spiral limiter and the spiral drive mechanism in the present invention from another perspective; Figure 10 It is a structural schematic diagram of the lens barrel lifting mechanism in the present invention.

[0024] In the figure: 1. lens seat; 11. seat mounting portion; 12. seat movable portion; 13. wedge ring; 14. elastic connecting mechanism; 111. concave connecting groove; 112. first sliding abutting surface; 113. first annular protrusion; 114. first abutting ring; 121. second sliding abutting surface; 122. second annular protrusion; 123. second abutting ring; 131. first sliding curved surface; 132. second sliding curved surface; 141. positioning bolt; 142. compression spring; 2. lens; 3. lens barrel; 4. support platform; 41. support base; 5. screw Rotary limiter; 51. Limiting connection; 511. Magnetic sheet; 52. Sliding limiter; 53. First wedge-shaped surface; 54. Second wedge-shaped surface; 55. Magnetic protrusion; 56. Magnetic groove; 6. Coaxial mounting mechanism; 61. V-block; 62. Double-ended lead screw; 63. Lead screw sleeve; 64. Moving plate; 7. Screw drive mechanism; 71. Rotary connection; 711. Rotary connection cylinder; 72. Power assembly; 721. Worm gear; 722. Worm; 8. Lens barrel lifting mechanism; 81. Fixed seat; 82. Fixed plate; 83. Moving lead screw. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In optical imaging systems, the lens barrel serves as a critical structural component that supports and positions the lenses. Its thermal stability directly impacts the lens's imaging performance. Because the lens barrel material typically has a non-zero coefficient of thermal expansion, changes in ambient temperature cause the barrel to deform due to thermal expansion and contraction. This can cause the actual position of each lens within the barrel to shift relative to the mechanical reference point on the barrel. This shift alters the designed spacing between the lenses, in turn affecting key lens parameters such as the effective focal length (EFL), image plane position, and optical aberrations (such as spherical aberration, field curvature, and chromatic aberration). Ultimately, this can lead to degraded image quality, such as image blur, reduced resolution, or decreased image acquisition stability (due to thermal drift or calibration failure).

[0027] In order to solve the above problems, Figures 1-4 As shown, the present invention first provides a lens holder, which is fixedly installed in a lens barrel 3 so that the lens 2 in the lens holder 1 can maintain balance along the optical axis direction of the lens 2 when the temperature changes. The lens holder 1 includes: The mounting portion 11 is annular in structure, with its circumference connected to the inner wall of the lens barrel 3 by threads. One end of the mounting portion 11 is provided with an inner concave connecting groove 111 to drive the mounting portion 11 to rotate along the end of the lens barrel 3 to a predetermined position. The other end of the mounting portion 11 is provided with a first sliding abutment surface 112 on the inner or outer side. In this embodiment, the lens 2 in the lens holder 1 remains balanced along the optical axis direction of the lens 2 when the temperature changes. In fact, it means that the distance between the lens 2 in the lens holder 1 and the preset reference point remains unchanged, so that the deformation of the lens barrel 3 due to thermal expansion and contraction at different temperatures will not cause the lens 2 to shift relative to the reference point on the lens barrel 3. This ensures that the focal length of the lens will not change due to temperature changes, ensures that the final imaging effect of the lens is consistent, and improves the stability of image acquisition.

[0028] In this embodiment, the number of lens holders 1 in the lens barrel 3 is specifically set according to the actual lens, and the positions of the lenses 2 relative to the reference point remain unchanged, ensuring that the distance between any lenses 2 remains consistent, thereby ensuring the stability of the lens.

[0029] In this embodiment, the reference point may be the end, middle or any other position of the lens barrel 3 to ensure that the distances between the lenses 2 and the reference point are consistent.

[0030] In this embodiment, the lens holder 1 is installed on the inner side of the lens barrel 3 through the internal and external threads on the periphery of the holder mounting portion 11 and the inner side of the lens barrel 3, so that the lens holder 1 can be installed and limited at any position inside the lens barrel 3 under the restriction of the threads, making it convenient to adjust the relative positions of several lenses 2 and obtain the specified lens focus.

[0031] In this embodiment, without considering the deformation of the lens barrel 3 due to temperature, the position of the seat mounting portion 11 relative to the lens barrel 3 remains unchanged after installation. However, after the temperature influence factor is introduced, the position of the seat mounting portion 11 relative to the reference point moves synchronously with the deformation of the lens barrel 3.

[0032] The seat movable portion 12 is slidably connected to the circumference of the seat mounting portion 11, and a second sliding abutment surface 121 corresponding to the first sliding abutment surface 112 is provided on the inner side or outer side of one end of the seat mounting portion 11; In this embodiment, there is a tendency for relative movement between the seat movable portion 12 and the seat mounting portion 11. Without considering the deformation of the lens barrel 3 due to temperature, the position of the seat movable portion 12 relative to the lens barrel 3 remains unchanged after installation. However, after the temperature influence factor is introduced, the position of the seat movable portion 12 relative to the reference point deforms with the lens barrel 3, and under the action of external forces limited by the structure, a displacement in the opposite direction of the deformation of the lens barrel 3 is generated, so that the position of the seat movable portion 12 relative to the reference point remains unchanged, thereby compensating for the deformation of the lens barrel 3 caused by temperature changes.

[0033] In this embodiment, the position of the reference point on the lens barrel 3 may be located on both sides of the lens 2, which determines that when the lens barrel 3 is deformed, the distance between the lens 2 and the reference point on the lens barrel 3 becomes larger or smaller. In addition, since multiple lenses 2 may be arranged in the lens barrel 3, each lens 2 may be located on a different side relative to the reference point. Therefore, in order to ensure that each lens 2 moves in the correct direction when the lens barrel 3 is deformed due to temperature, the position of the first sliding abutment surface 112 or the second sliding abutment surface 121 can be adaptively selected to be set on the inner side or outer side of the seat mounting portion 11 or the seat movable portion 12, so that each lens 2 can individually control the displacement compensation direction.

[0034] The wedge ring 13 includes a first sliding curved surface 131 that is in sliding contact with the first sliding contact surface 112 and a second sliding curved surface 132 that is in sliding contact with the second sliding contact surface 121; In this embodiment, the first sliding curved surface 131 and the second sliding curved surface 132 have matching design structural surfaces with the first sliding abutment surface 112 and the second sliding abutment surface 121 respectively, so as to facilitate the relative movement between the wedge ring 13 and the seat movable part 12 or the seat mounting part 11 and reduce the movement resistance.

[0035] In this embodiment, the first sliding curved surface 131 , the second sliding curved surface 132 , the first sliding abutting surface 112 and the second sliding abutting surface 121 are all designed to be wedge-shaped surfaces that slide against each other to minimize movement resistance.

[0036] In this embodiment, the wedge ring 13 is located between the seat mounting portion 11 and the seat movable portion 12 and is used to directly abut against the surfaces of the seat mounting portion 11 and the seat movable portion 12 to generate a force to guide the seat movable portion 12 to compensate for the deformation and displacement of the lens barrel 3.

[0037] A plurality of elastic connection mechanisms 14 pass through the seat movable portion 12 and are connected to the seat mounting portion 11, and are used to continuously and elastically press the seat movable portion 12 to move closer to the seat mounting portion 11, so that the wedge ring 13 is tightly connected to the first sliding abutment surface 112 and the second sliding abutment surface 121, respectively, thereby limiting the movement of the wedge ring 13 along its axial direction; In this embodiment, after the wedge ring 13 is deformed due to temperature under the action of the elastic connecting mechanism 14, the seat movable part 12 has a displacement force to move closer to or away from the seat mounting part 11, so that the distance between the seat movable part 12 and the seat mounting part 11 changes under the action of the elastic connecting mechanism 14, which directly drives the wedge ring 13 to abut.

[0038] In this embodiment, the elastic connection mechanism 14 can also limit the relative movement of the seat movable part 12 and the seat mounting part 11 in the radial direction, so that the seat movable part 12 and the seat mounting part 11 can only maintain relative movement in the axial direction, which also limits the relative distance change between the seat movable part 12 and the seat mounting part 11 to only occur in the axial direction, thereby facilitating limiting the movement of the lens 2 only along the axial direction of the lens barrel 3.

[0039] Among them, the lens 2 is installed at the center of the seat movable part 12; the wedge ring 13 expands or compresses when the temperature changes, causing its inner diameter to increase or decrease, thereby changing the relative distance between the seat movable part 12 and the seat mounting part 11, so as to drive the lens 2 to move along the optical axis direction of the lens 2, so as to offset the offset of the seat mounting part 11 driven by the lens barrel 3 when the temperature changes.

[0040] In this embodiment, the lens 2 is mounted on the seat movable portion 12, that is, the lens 2 is displaced relative to the seat mounting portion 11 or the lens barrel 3 along with the seat movable portion 12, so that the lens 2 on the seat movable portion 12 compensates for the change in lens focus caused by the deformation of the lens barrel 3 as it moves, thereby ensuring the stability of image acquisition.

[0041] In this embodiment, the wedge ring 13 is made of a material with a high coefficient of expansion so that the wedge ring 13 will produce a deformation due to thermal expansion and contraction when the temperature changes. Specifically, since the deformation of the wedge ring 13 in the radial direction is larger than the deformation in the axial direction, only the radial deformation is considered here and the axial deformation is ignored.

[0042] In the present invention, a wedge ring 13 with a high expansion coefficient is provided so that the wedge ring 13 is deformed synchronously when the lens barrel 3 is deformed with temperature changes, and the relative sliding between the seat mounting portion 11 and the seat movable portion 12 is coordinated. The wedge ring 13 is driven to abut between the seat mounting portion 11 and the seat movable portion 12 through the elastic connection mechanism 14, so that the seat movable portion 12 is driven to move closer to or away from the seat mounting portion 11 through the deformation of the wedge ring 13, and the position of the lens 2 on the seat movable portion 12 relative to the reference point on the lens barrel 3 is synchronously driven to change, so as to compensate for the change in the distance between the lens 2 and the reference point caused by the deformation of the lens barrel 3, thereby ensuring that the relative position of each lens 2 and the reference point remains unchanged, so that the lens system composed of a plurality of lenses 2 maintains stable image acquisition performance, and reduces the influence of the deformation of the lens barrel 3 caused by temperature changes on the lens image acquisition effect.

[0043] In addition, in the present invention, by providing corresponding first sliding abutment surfaces 112 and second sliding abutment surfaces 121 on the inner side or outer side of the seat mounting portion 11 and the seat movable portion 12, the seat mounting portion 11 and the seat movable portion 12 are controlled to be located on the inner side or outer side of the wedge ring 13, and then the wedge ring 13 is controlled to synchronously drive the seat movable portion 12 to approach or move away from the seat mounting portion 11 when deforming, so as to control the lens 2 to approach or move away from the reference point position of the lens barrel 3 as the seat movable portion 12 is controlled, so as to adaptively select the displacement compensation direction of each lens 2 according to the setting position of the lens 2 relative to the reference point, thereby realizing independent control of the displacement compensation direction of each lens 2, which has strong practicality.

[0044] like Figure 1-Figure 2 As shown, in order to facilitate the installation of the seat mounting portion 11 and the seat movable portion 12, so that the seat movable portion 12 can only approach or move away from the seat mounting portion 11 in the axial direction under the limitation of the elastic connection mechanism 14, in some embodiments, a first annular protrusion 113 is provided at the center of the other end of the seat mounting portion 11 opposite to the concave connection groove 111 to fix the elastic connection mechanism 14; A second annular protrusion 122 is provided on the seat movable portion 12 near the center of one end of the seat mounting portion 11 for mounting the elastic connecting mechanism 14; There are gaps between the wedge ring 13 and the first annular protrusion 113 and the second annular protrusion 122 to prevent the wedge ring 13 from contacting the first annular protrusion 113 and the second annular protrusion 122 when the temperature changes.

[0045] In this embodiment, by setting the first annular protrusion 113 and the second annular protrusion 122, on the one hand, the connection distance between the seat mounting portion 11 and the seat movable portion 12 can be shortened, and on the other hand, the first annular protrusion 113 and the second annular protrusion 122 can respectively limit the movement of the seat movable portion 12 and the seat mounting portion 11 on the axis, so as to cooperate with the elastic connection mechanism 14 to make the seat movable portion 12 only approach or move away from the seat mounting portion 11 in the radial direction, thereby limiting the movement of the lens 2 only along the axis direction of the lens barrel 3.

[0046] In this embodiment, since the wedge ring 13 will produce radial deformation when the temperature changes, in order to avoid interference between the wedge ring 13 and the first annular protrusion 113 and the second annular protrusion 122, which may cause the deformation of the wedge ring 13 to be restricted or even the structure to be damaged, the wedge ring 13 and the first annular protrusion 113 and the second annular protrusion 122 should have relatively sufficient deformation space to ensure structural stability.

[0047] In order to achieve relative movement between the seat movable portion 12 and the seat mounting portion 11, in some embodiments, the elastic connection mechanism 14 includes: The positioning bolt 141 passes through the second annular protrusion 122 and is threadedly connected to the first annular protrusion 113; The compression spring 142 has two ends respectively in contact with the end of the positioning bolt 141 and the seat movable portion 12 to continuously and elastically compress the seat movable portion 12 .

[0048] In this embodiment, a first external thread is provided on the outer surface of one end of the positioning bolt 141, a first annular connecting groove is provided on the side of the middle part of the first annular protrusion 113 close to the seat movable part 12, and a first internal thread is provided on the inner surface of the first annular connecting groove that is compatible with the first external thread, so that one end of the positioning bolt 141 is fixedly installed in the first annular connecting groove on the first annular protrusion 113, ensuring the relative fixation of the positioning bolt 141 and the seat mounting part 11.

[0049] In this embodiment, a head is fixedly provided at the end of the positioning bolt 141 away from the first external thread, and a accommodating chamber for accommodating the head and the compression spring 142 is opened on the side of the seat movable part 12 away from the seat mounting part 11, and a second annular connecting groove for passing the bolt rod is opened through the middle part of the second annular protrusion 122, so that one end of the positioning bolt 141 passes through the second annular connecting groove and is connected to the second annular protrusion 122, and one end of the second annular connecting groove is communicated with the accommodating chamber.

[0050] In this embodiment, under the squeezing action of the compression spring 142, the seat movable part 12 always has a tendency to approach the seat mounting part 11, so that the mutual squeezing force between the seat movable part 12 and the seat mounting part 11 limits the wedge ring 13, and at the same time ensures that the deformation of the wedge ring 13 can drive the seat movable part 12 to approach or move away from the seat mounting part 11 when the temperature changes, so as to realize the displacement compensation of the lens 2 along with the seat movable part 12.

[0051] In the present invention, one end of the positioning bolt 141 is fixedly connected to the first annular protrusion 113 by the threaded cooperation of the first external thread and the first internal thread, so that the position of the seat mounting portion 11 and the elastic connecting mechanism 14 is relatively fixed, and the sliding connection between the bolt rod and the second annular connecting groove is used to enable the seat movable portion 12 and the elastic connecting mechanism 14 to move relative to each other when the wedge ring 13 is deformed, thereby converting the deformation of the wedge ring 13 into the relative displacement of the seat movable portion 12 and the seat mounting portion 11, so as to drive the lens 2 to change its position relative to the reference point on the lens barrel 3, reversely compensating for the displacement of the lens 2 caused by the deformation of the lens barrel 3 due to temperature changes, and reducing the influence of temperature changes on the imaging quality of the optical lens.

[0052] In order to synchronously drive the movement of the lens 2 by driving the seat movable portion 12 relative to the seat mounting portion 11 through the deformation of the wedge ring 13 and accurately compensate for the displacement of the lens 2 caused by the deformation of the lens barrel 3 due to temperature changes, in some embodiments, the first sliding curved surface 131 and the second sliding curved surface 132 satisfy the following relationship:

[0053] Wherein, L0 is the distance between the seat mounting portion 11 and the reference point on the lens barrel 3, α is the thermal expansion coefficient of the lens barrel 3, R is the inner diameter of the wedge ring 13, β is the thermal expansion coefficient of the wedge ring 13, θ1 is the angle formed by the first sliding surface 131 and the axis of the wedge ring 13, and θ2 is the angle formed by the second sliding surface 132 and the axis of the wedge ring 13.

[0054] In this embodiment, in order to ensure that the change in the distance between the movable portion 12 of the driving seat and the seat mounting portion 11 after the wedge ring 13 is deformed is equal to the displacement of the corresponding lens 2 relative to the reference point after the lens barrel 3 is deformed, the relationship between the angle between the first sliding surface 131 and the second sliding surface 132 and the distance from the lens 2 to the reference point is calculated based on the equal change in the material length affected by temperature. The specific derivation process includes: When the lens barrel 3 is deformed by temperature change, the change in the distance of the lens 2 relative to the reference point is:

[0055] After the wedge ring 13 is deformed by temperature change, the radius change of the wedge ring 13 in the radial direction is:

[0056] The change in the distance between the seat mounting portion 11 and the seat movable portion 12 includes the sum of the displacement of the seat mounting portion 11 relative to the wedge ring 13 in the axial direction and the displacement of the seat movable portion 12 relative to the wedge ring 13 in the axial direction. The change in the distance is:

[0057] The two are equal:

[0058] Simplified:

[0059] The above can be used to obtain the relationship that needs to be satisfied between the distance of the lens 2 relative to the reference point and the angles between the first sliding curved surface 131 and the second sliding curved surface 132 .

[0060] Since the wedge ring 13 will continuously deform when the temperature changes, the contact surfaces between the wedge ring 13 and the seat mounting portion 11 and the seat movable portion 12 will continuously move relative to each other and wear out. In order to facilitate the replacement and maintenance of the contact surfaces between the wedge ring 13 and the seat mounting portion 11 and the seat movable portion 12, in some embodiments, the first sliding abutment surface 112 is provided by a first abutment ring 114, which is embedded in the seat mounting portion 11. The second sliding abutment surface 121 is provided by a second abutment ring 123 , which is engaged with the seat movable portion 12 .

[0061] In this embodiment, the first abutment ring 114 and the second abutment ring 123 are provided and respectively embedded on the seat mounting portion 11 and the seat movable portion 12, so that the first sliding abutment surface 112 and the second sliding abutment surface 121 can be separated from the seat mounting portion 11 and the seat movable portion 12, so that the first abutment ring 114 and the second abutment ring 123 can be replaced to facilitate the movement resistance of the contact surface between the wedge ring 13 and the seat mounting portion 11 and the seat movable portion 12 to be maintained in an optimal state.

[0062] In another embodiment of the present invention, the first sliding abutment surface 112 may also be directly provided by the surface of the seat mounting portion 11 , that is, the first sliding abutment surface 112 and the seat mounting portion 11 are integrally provided; The second sliding abutting surface 121 may also be directly provided by the surface of the seat movable portion 12 , that is, the second sliding abutting surface 121 and the seat movable portion 12 are integrally provided.

[0063] In order to facilitate the symmetrical processing and installation of the wedge ring 13, in some embodiments, the cross-sectional shape of the wedge ring 13 is an isosceles triangle structure, so that the angle formed by the first sliding surface 131 and the axis of the wedge ring 13 is equal to the angle formed by the second sliding surface 132 and the axis of the wedge ring 13.

[0064] In this embodiment, by setting the cross-sectional shape of the wedge ring 13 to an isosceles triangle structure, on the one hand, the processing difficulty of the wedge ring 13 can be reduced through symmetrical processing, and on the other hand, the symmetrical wedge ring 13 is more convenient to install, so that the relative movement distances between the seat mounting portion 11 and the seat movable portion 12 and the wedge ring 13 are the same.

[0065] like Figure 5-10As shown, in order to facilitate the installation of a plurality of lens holders 1 in the lens barrel 3, the present invention further provides an assembly tool for the lens holder 1, which is used to cooperate with the installation of the lens holder 1, including: A supporting platform 4, used for supporting and placing the lens holder 1; The spiral limiter 5 is vertically mounted on the support platform 4 and consists of a limiter connection portion 51 at the top and a sliding limiter portion 52 at the bottom. The limiter connection portion 51 is inserted into the concave connection groove 111 and is magnetically connected to the seat mounting portion 11. In this embodiment, the lens holder 1 is placed on the supporting platform 4 and is driven by the screw limiter 5 to realize a rotational feeding motion so that the lens holder 1 is installed in the lens barrel 3 through the screw thread.

[0066] In this embodiment, the spiral limiter 5 and the lens holder 1 are connected through the mutual cooperation between the concave connecting groove 111 and the limiting connecting part 51, ensuring that the spiral limiter 5 and the lens holder 1 are installed in place, and through the magnetic connection method, the spiral limiter 5 is made to rotate and feed along with the lens holder 1, ensuring the smooth installation of the lens holder 1 and the lens barrel 3.

[0067] In this embodiment, on the one hand, the radial displacement of the spiral limiter 5 and the lens holder 1 is limited by the cooperative connection between the concave connecting groove 111 and the limiting connecting portion 51, and on the other hand, the axial displacement of the spiral limiter 5 and the lens holder 1 is limited by the magnetic connection, further strengthening the installation strength of the spiral limiter 5 and the lens holder 1, so that the lens holder 1 can rotate and feed along with the spiral limiter 5 to achieve installation in the lens barrel 3.

[0068] The coaxial mounting mechanism 6 includes two V-shaped blocks 61 that are arranged opposite to each other and move synchronously toward or away from each other along the support platform 4 to limit the position of the wedge ring 13 so that the wedge ring 13 is coaxially mounted on the seat mounting portion 11; In this embodiment, in order to ensure that the wedge ring 13 is coaxially mounted on the seat mounting portion 11 , two relatively movable V-shaped blocks 61 are provided to limit the installation position of the wedge ring 13 .

[0069] The screw drive mechanism 7 includes a rotating connector 71 and a power assembly 72 connected to each other. The rotating connector 71 is slidably connected to the sliding limiter 52 in the vertical direction and limits the free rotation of the sliding limiter 52 in the horizontal direction. The power assembly 72 is used to drive the rotating connector 71 to rotate, thereby driving the lens holder 1 to be screwed into the lens barrel 3. In this embodiment, in order to provide synchronous rotation in the radial direction and relative movement in the axial direction between the spiral limiter 5 and the spiral drive mechanism 7, the free rotation of the sliding limiter 52 in the horizontal direction, i.e., the radial direction, is restricted, and the rotating connection 71 and the sliding limiter 52 are ensured to be able to move relative to each other in the vertical direction, i.e., the axial direction, and then the power component 72 is used to control the rotation of the rotating connection 71 and the synchronous rotation of the sliding limiter 52.

[0070] The lens barrel lifting mechanism 8 is used to vertically place the lens barrel 3 and drive the lens barrel 3 to move in the vertical direction to approach the top of the peripheral side of the seat mounting portion 11, so as to be threadedly connected with the lens barrel 3 when the seat mounting portion 11 rotates.

[0071] In this embodiment, there needs to be an initial threaded contact between the lens barrel 3 and the lens holder 1 so that the threads on the lens barrel 3 and the lens holder 1 that match each other are aligned, and then the lens holder 1 is rotated upward to achieve threaded installation of the two.

[0072] In the present invention, the assembly tooling of the lens holder 1 specifically includes the following steps: first, the spiral limiter 5 is accurately positioned at the specified position of the support platform 4 by using the limiting connection part 51, and the positioning of the seat mounting part 11 is achieved by the cooperation between the concave connecting groove 111 and the limiting connection part 51, and the displacement of the lens holder 1 and the spiral limiter 5 in the horizontal and vertical directions is further constrained by the magnetic connection method; then the first abutment ring 114 is engaged and installed on the seat mounting part 11, and the radial space of the wedge ring 13 is compressed by driving the two V-blocks 61 of the coaxial mounting mechanism 6 to be synchronously approached to ensure that the wedge ring 13 is coaxially abutted with the first abutment ring 114; after completing the above operations, the V-block 61 is removed, and the seat movable part 12 with the second abutment ring 123 is fitted on the wedge ring 13, and finally the seat mounting part 11, the wedge ring 13 and the seat movable part 12 are locked and connected by the elastic connection mechanism 14 to complete the assembly of the lens holder 1. During the rotary feed assembly process, the lens barrel 3 is first driven downward by the lens barrel lifting mechanism 8 to a position where its threads are aligned with the lens holder 1. The screw drive mechanism 7 then controls the power assembly 72 to drive the rotary connector 71 to rotate. The vertical sliding cooperation between the rotary connector 71 and the sliding limiter 52, as well as the magnetic connection between the screw limiter 5 and the seat mounting portion 11, drives the lens holder 1 to perform a rotary feed motion, thereby achieving a threaded connection between the lens holder 1 and the lens barrel 3. The present invention ensures that the lens holder 1 achieves precise rotary feed motion under the drive of the power assembly 72 through the magnetic connection and mutual limiting relationship between the screw limiter 5 and the seat mounting portion 11, thereby achieving automated assembly of the threaded connection between the lens holder 1 and the lens barrel 3, and has significant practical value.

[0073] like Figure 6 As shown, in some embodiments, the coaxial mounting mechanism 6 further includes: The double-ended screw rod 62 has symmetrically distributed screw rod sleeves 63 threadedly connected to both ends of its outer surface, so that when the double-ended screw rod 62 rotates, the two screw rod sleeves 63 can be driven to move toward each other.

[0074] The bottoms of the symmetrically arranged movable plates 64 are slidably arranged on the supporting platform 4 via first slide rails.

[0075] In this embodiment, two screw sleeves 63 are respectively fixed on one end of the top of the two moving plates 64, and two V-shaped blocks 61 are fixed on the top of the moving plates 64 so that the V-shaped blocks 61 can move toward each other through the relative movement of the moving plates 64.

[0076] In this embodiment, one end of the double-ended screw rod 62 is rotatably connected to the support platform 4 , and the other end of the double-ended screw rod 62 is connected to a first handle for driving the double-ended screw rod 62 to rotate on the support platform 4 .

[0077] In some embodiments, the first handle may be replaced by an electric means such as a drive motor.

[0078] In this embodiment, the double-headed screw 62 is driven to rotate by the first handle, and the threaded connection between the screw sleeve 63 and the double-headed screw 62 and the rotation limit of the screw sleeve 63 by the first slide rail and the movable plate 64 are coordinated to make the two screw sleeves 63 move toward each other on the screw, and synchronously drive the two V-blocks 61 to move relative to each other to clamp or limit the wedge ring 13.

[0079] In this embodiment, the height of the V-block 61 is exactly the same as the height of the wedge ring 13 placed on the first abutment ring 114, so that the wedge ring 13 can be exactly engaged. After loosening the V-block 61 so that there is a certain gap between it and the wedge ring 13, the wedge ring 13 can fall along the V-block 61 to be installed on the first abutment ring 114.

[0080] like Figure 10 As shown, in some embodiments, the lens barrel lifting mechanism 8 includes: The fixing seat 81 is provided on one side of the supporting platform 4; The fixing plate 82 is slidably disposed on one side of the fixing seat 81 via a second slide rail and is used for mounting the lens barrel 3 so that the lens barrel 3 can be displaced in the vertical direction as the fixing plate 82 moves.

[0081] In order to achieve the movement of the fixed plate 82, in some embodiments, a moving screw 83 is rotatably provided on the fixed seat 81, and one end of the fixed plate 82 is threadedly connected to the moving screw 83, so that as the moving screw 83 rotates, the fixed plate 82 can achieve vertical movement under the limitation of the second slide rail.

[0082] In this embodiment, one end of the movable screw rod 83 is rotatably mounted on the fixed seat 81 , and the other end is fixedly mounted with a second handle.

[0083] In some embodiments, the second handle can also be replaced by an electric means such as a drive motor to drive the movable screw 83 to rotate, thereby driving the fixed plate 82 to move along the second slide rail under the limit of the second slide rail, thereby driving the lens barrel 3 to move in the vertical direction to the specified installation position.

[0084] like Figure 7 As shown, in order to provide a stable output power for the rotational feed installation of the lens holder 1, in some embodiments, the power assembly 72 is composed of a worm gear structure, wherein one end of the worm 722 is connected to the power source, and the worm gear 721 is installed horizontally at the bottom of the rotating connection member 71; A rotating connection cylinder 711 is provided at the top of the rotating connection member 71 and is slidably connected to the sliding limiter 52 along the vertical direction. A limiting groove or a limiting protrusion is provided inside the rotating connection cylinder 711 for limiting the free rotation of the sliding limiter 52.

[0085] In some embodiments, in order to provide an installation position for the power assembly 72 , a support base 41 is fixedly installed on the bottom of the support platform 4 , and the support platform 4 and the support base 41 are fixedly connected via a plurality of support shafts.

[0086] In this embodiment, the power source can be output manually or electrically to drive the worm 722 to rotate and thereby drive the worm wheel 721 to rotate. The end of the worm 722 away from the power source is rotatably connected to the support base 41.

[0087] In this embodiment, the installation method between the worm gear 721 and the rotating connector 71 is a detachable installation. Specifically, a pin is fixedly provided on the middle part of the side of the worm gear 721 close to the rotating connector 71 to adapt to the pin hole opened at the bottom of the rotating connector 71, thereby realizing the installation of the worm gear 721 and the rotating connector 71, so that the rotating connector 71 and the worm gear 721 form an integral rotation installation on the support base 41. In some embodiments, the worm gear 721 and the bottom of the rotating connector 71 can also be fixedly connected by gluing, welding, etc. to improve the installation stability.

[0088] In some embodiments, the power assembly 72 may also be a gear drive, a chain drive, a belt drive, a screw drive, or other transmission methods to achieve the rotation of the rotating connector 71 .

[0089] In this embodiment, the sliding limit portion 52 is provided with a limiting structure that is compatible with the limiting groove or limiting protrusion on the inner wall of the rotating connecting cylinder 711, so as to cooperate with the limiting groove or limiting protrusion to limit the horizontal rotation of the sliding limit portion 52 in the rotating connecting cylinder 711, but will not limit its free movement in the vertical direction, so as to provide a rotational feed movement space for the sliding limit portion 52.

[0090] In some embodiments, a magnetic sheet 511 is fixedly mounted on the top of the position-limiting connection portion 51, and the bottom end is position-limited with the top surface of the support platform 4; The sliding limit portion 52 passes through the supporting platform 4 and is engaged with the top end of the rotating connector 71 .

[0091] In this embodiment, the limiting connection part 51 is magnetically connected to the lens holder 1 through the magnetic sheet 511 installed at the top, and the limiting cooperation between the bottom end and the top surface of the support platform 4 ensures that the spiral connector is placed in place.

[0092] In order to enable the spiral connector and the support platform 4 to be installed in place, in some embodiments, a first wedge surface 53 is provided at the bottom of the spiral connector, and a second wedge surface 54 that is compatible with the first wedge surface 53 is provided at the top of the support platform 4, wherein the first wedge surface 53 and the second wedge surface 54 are both annular, and the bottom of the second wedge surface 54 passes through the bottom of the support platform 4, so that the sliding limit portion 52 can pass through the support platform 4 and connect with the rotating connector 71.

[0093] In this embodiment, a scale is further provided on the outer surface of the sliding limit portion 52 for visually displaying the stepping distance of the lens holder.

[0094] In order to further improve the installation strength of the spiral connector and the lens seat 1, in some embodiments, a plurality of magnetic protrusions 55 are fixedly provided on the top of the limiting connection part 51, and a plurality of magnetic grooves 56 corresponding to and cooperating with the magnetic protrusions 55 are provided at the bottom of the seat mounting part 11, which are used to limit the relative rotation of the seat mounting part 11 and the limiting connection part 51 in the radial direction through the cooperating connection between the magnetic protrusions 55 and the magnetic grooves 56, so as to synchronously drive the rotation of the seat mounting part 11 through the rotation of the limiting connection part 51.

[0095] In this embodiment, in order to ensure the installation stability of the magnetic sheet 511, an installation groove for installing the magnetic sheet 511 is opened in the middle of the magnetic protrusion 55. The magnetic sheet 511 can be installed in the installation groove by gluing or snapping to prevent the magnetic sheet 511 from detaching from the limiting connection part 51. The magnetic groove 56 is provided with a magnetic material that is magnetically connected to the magnetic sheet 511 to make the magnetic attraction force between the magnetic sheet 511 and the seat mounting part 11 greater.

[0096] In order to precisely control the stepping distance of the lens holder 1 in the lens barrel 3, a servo motor is connected to one end of the worm 722. The control conditions of the servo motor satisfy the following relationship:

[0097] Wherein, N1 is the number of revolutions of the worm 722 driven by the servo motor, z1 is the number of worm heads, z2 is the number of worm gear teeth, ΔL is the stepping distance of the lens holder 1, and P is the pitch of the thread between the lens holder 1 and the lens barrel 3.

[0098] In this embodiment, the calculation process for determining the stepping distance of the lens holder 1 based on the number of revolutions of the servo motor is as follows: The calculation formula for the number of revolutions of the worm gear 721 is:

[0099] The calculation formula for the number of rotations of lens holder 1 is:

[0100] The two are equal:

[0101] Therefore, the stepping distance of lens mount 1 is:

[0102] Wherein, N2 is the number of revolutions of the worm gear 721, and N3 is the number of revolutions of the lens holder 1.

[0103] The above relationship can be obtained by controlling the number of revolutions of the servo motor to adjust the stepping distance of the lens holder 1.

[0104] In this embodiment, the number of revolutions of the servo motor can be an integer or a decimal, which also represents the rotation angle of the servo motor or the worm 722 .

[0105] In the present invention, the transmission ratio of the worm gear is used to obtain the relationship between the rotation angle of the worm 722 and the rotation angle of the worm wheel 721, and the rotation angle of the lens holder 1 is obtained based on the rotation angle of the worm wheel 721. The relative displacement of the lens holder 1 and the lens barrel 3 is calculated according to the pitch of the connecting thread between the lens holder 1 and the lens barrel 3, and the stepping distance of the lens holder 1 is obtained. The rotation angle of the worm gear structure is controlled by a servo motor, and the displacement distance of the lens holder 1 in the lens barrel 3 is precisely controlled to ensure that each lens holder 1 is installed in place, thereby improving the installation accuracy and efficiency.

[0106] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A lens holder fixedly mounted in a lens barrel to keep the lens in the holder balanced along the optical axis of the lens when the temperature changes, characterized in that: The lens mount includes: The seat mounting portion is annular in structure, with its circumference connected to the inner wall of the lens barrel by threads, one end of which is provided with an inwardly concave connecting groove to drive the seat mounting portion to rotate along the end of the lens barrel to a predetermined position, and the other end of which is provided with a first sliding abutment surface on the inner or outer side; The seat movable portion is slidably connected to the peripheral side of the seat mounting portion, and is provided with a second sliding abutment surface corresponding to the first sliding abutment surface on the inner side or outer side near one end of the seat mounting portion; The wedge ring includes a first sliding curved surface that is in sliding contact with the first sliding contact surface and a second sliding curved surface that is in sliding contact with the second sliding contact surface; A plurality of elastic connection mechanisms, passing through the seat movable portion and connected to the seat mounting portion, are used to continuously and elastically press the seat movable portion to approach the seat mounting portion so that the wedge ring is tightly connected to the first sliding abutment surface and the second sliding abutment surface respectively, thereby limiting the movement of the wedge ring along its axial direction; Among them, a lens is installed in the center of the seat movable part; the wedge ring expands or compresses when the temperature changes, causing its inner diameter to increase or decrease, thereby changing the relative distance between the seat movable part and the seat mounting part, so as to drive the lens to move along the optical axis of the lens, so as to offset the offset of the seat mounting part driven by the lens barrel when the temperature changes.

2. A lens holder according to claim 1, characterized in that: A first annular protrusion is provided at the center of the other end of the seat mounting portion opposite to the inwardly concave connecting groove to fix the elastic connecting mechanism; A second annular protrusion is provided on the seat movable portion near the center of one end of the seat mounting portion for mounting the elastic connecting mechanism; There are gaps between the wedge ring and the first annular protrusion and the second annular protrusion to prevent the wedge ring from contacting the first annular protrusion and the second annular protrusion when the temperature changes.

3. A lens holder according to claim 2, characterized in that: The elastic connection mechanism includes: a positioning bolt passing through the second annular protrusion and being threadedly connected to the first annular protrusion; The two ends of the compression spring respectively abut against the end of the positioning bolt and the seat movable part to continuously and elastically compress the seat movable part.

4. The lens holder according to claim 1, wherein: The first sliding surface and the second sliding surface satisfy the following relationship: ; Wherein, L0 is the distance between the seat mounting portion and the reference point on the lens barrel, α is the thermal expansion coefficient of the lens barrel, R is the inner diameter of the wedge ring, β is the thermal expansion coefficient of the wedge ring, θ1 is the angle formed by the first sliding surface and the axis of the wedge ring, and θ2 is the angle formed by the second sliding surface and the axis of the wedge ring.

5. A lens holder according to any one of claims 1 to 4, characterized in that: The first sliding abutment surface is provided by a first abutment ring, which is engaged on the seat mounting portion; The second sliding abutment surface is provided by a second abutment ring, which is engaged on the seat movable portion.

6. The lens holder according to claim 5, characterized in that: The cross-section of the wedge ring is an isosceles triangle structure, so that the angle formed by the first sliding curved surface and the axis of the wedge ring is equal to the angle formed by the second sliding curved surface and the axis of the wedge ring.

7. An assembly tool for a lens holder, used for assembling the lens holder according to any one of claims 1 to 6, characterized in that: include: A supporting platform, used for supporting and placing a lens seat; The spiral limiter is installed on the support platform in the vertical direction and consists of a limit connection part at the top and a sliding limit part at the bottom. The limit connection part is inserted into the concave connection groove and is magnetically connected to the seat mounting part. The coaxial mounting mechanism includes two V-shaped blocks that are distributed opposite to each other and move synchronously toward or away from each other along the support platform to limit the position of the wedge ring so that the wedge ring is coaxially mounted on the seat mounting portion; The screw drive mechanism includes a rotating connector and a power assembly connected to each other, wherein the rotating connector is slidably connected to the sliding limiter in the vertical direction and limits the free rotation of the sliding limiter in the horizontal direction; the power assembly is used to drive the rotating connector to rotate, thereby driving the lens holder to screw into the lens barrel; The lens barrel lifting mechanism is used to vertically place the lens barrel and drive the lens barrel to move in the vertical direction to approach the top end of the peripheral side of the seat mounting part, so as to be threadedly connected with the lens barrel when the seat mounting part rotates.

8. The assembly tool for a lens holder according to claim 7, characterized in that: The power assembly consists of a worm gear structure, in which one end of the worm is connected to the power source, and the worm gear is installed horizontally at the bottom of the rotating connection; A rotating connection cylinder is provided at the top of the rotating connection piece and is connected to the sliding limit part in a vertical sliding direction. A limiting groove or a limiting protrusion is provided inside the rotating connection cylinder for limiting the free rotation of the sliding limit part.

9. The assembly tool for a lens holder according to claim 8, characterized in that: A magnetic sheet is fixedly installed on the top of the limiting connection part, and the bottom end is limitedly matched with the top surface of the support platform; The sliding limiting portion passes through the supporting platform and is cooperatively connected with the top end of the rotating connecting piece.

10. The assembly tool for a lens holder according to claim 8, characterized in that: One end of the worm is connected to a servo motor, and the servo motor control conditions satisfy the following relationship: ; Among them, N1 is the number of revolutions of the worm driven by the servo motor, z1 is the number of worm heads, z2 is the number of worm gear teeth, ΔL is the stepping distance of the lens holder, and P is the pitch of the thread between the lens holder and the lens barrel.

Images