A low-stress, low-deformation support lens barrel and its fabrication method

Abstract

This invention discloses a low-stress, low-deformation support lens barrel and its fabrication method, belonging to the field of precision interferometric testing optical devices. The product includes a stress dispersion and transfer cylinder, mounting spherical heads, a core lens barrel, and self-balancing support components. The stress dispersion and transfer cylinder is sleeved on the outside of the core lens barrel, with three mounting spherical heads on the top, and the two are fixed by six screws on a connecting ring surface, isolating concentrated stress from the mounting. A core spherical reference mirror is integrally formed at the bottom of the core lens barrel, and the bottom of the core spherical reference mirror has an inclined support surface. Each of the three self-balancing support components has a double seesaw support point, totaling six points of adaptive load-sharing support to offset machining plane errors. The core lens barrel is assembled using separate screws for the lens frame, reducing residual welding stress. The supporting fabrication method involves separate machining followed by assembly, simplifying the process. This invention can block the transmission of mounting stress, achieve low-stress support for the spherical mirror, suppress non-deterministic surface deformation, effectively improve the accuracy of interferometric testing, and is suitable for high-precision optical measurement equipment.

Description

Technical Field

[0001] This invention relates to the field of precision interferometric testing optical equipment technology, specifically to a low-stress, low-deformation support lens barrel and its preparation method. Background Technology

[0002] High-precision interferometric testing equipment relies on a spherical reference mirror to complete optical interferometric measurements. It has extremely high requirements for the surface accuracy of the mirror, and even slight deformation of the mirror can directly lead to deviations in the test results.

[0003] Existing spherical lens barrels have two main drawbacks: 1. When the lens is mounted externally, the concentrated bending moment and stress generated by the mounting ball head are directly transmitted to the core lens barrel that houses the reference lens, causing the entire lens barrel to twist and the lens to deform under pressure. In conventional one-piece lens barrel structures without stress distribution, the deformation at the base of the mounting will be transmitted along the barrel to the reference lens area, damaging the surface accuracy of the lens.

[0004] 2. Spherical reference mirrors often use a single-point support on a ring-shaped plane. Due to the influence of the flatness of the mirror frame and the assembly clearance, the support force distribution is uneven, which is prone to non-deterministic surface distortion. Two-point and four-point support schemes cannot achieve uniform load distribution across the entire area and cannot offset the local stress concentration caused by processing errors, making it difficult to meet the requirements of high-precision interferometric testing.

[0005] Meanwhile, the traditional lens barrel is integrally welded, and the long-term release of welding residual stress will cause aging creep, which will further aggravate lens deformation; the lens barrel is assembled in parts and lacks an adaptive and self-balancing support structure, which cannot compensate for the dimensional deviations caused by assembly and processing, resulting in poor measurement stability. Summary of the Invention

[0006] To address the shortcomings of existing technologies, such as concentrated stress transmission to the reference mirror during mounting, uneven stress on the lens support, susceptibility to indeterminate deformation, and large deformation over time, a low-stress, low-deformation support lens barrel and its fabrication method are provided. This achieves stress isolation and diversion during mounting, and six-point self-balancing load-sharing support for the spherical reference mirror, significantly reducing lens deformation under pressure and improving the accuracy of interferometric detection and the long-term stability of the equipment.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following solution: A low-stress, low-deformation support lens barrel includes: a stress dispersion and transfer cylinder, a mounting ball head, a core lens barrel, and a self-balancing support component. The mounting ball head is disposed on the top of the stress dispersion and transfer cylinder, which is fitted over the core lens barrel. The stress dispersion and transfer cylinder and the core lens barrel are connected by a connecting ring surface, which has multiple threaded holes. The core lens barrel is fixedly connected to the stress dispersion and transfer cylinder by connecting screws passing through the threaded holes. A core spherical reference mirror is disposed at the bottom of the core lens barrel, and a reference mirror inclined support surface is disposed at the bottom of the core spherical reference mirror. The self-balancing support component contacts the reference mirror inclined support surface at multiple support points to support the core lens barrel.

[0008] Existing conventional optical telescope tubes mostly adopt a one-piece tube structure. The bending moment and concentrated stress generated by the mounting load are directly transmitted to the internal spherical reference mirror, which easily causes mirror deformation. At the same time, traditional support structures mostly use single-point or four-point support in a ring plane. Affected by the flatness error of the parts processing, the support load distribution is uneven, which easily produces uncertain surface distortion. This invention adds an independent stress dispersion and transmission tube to isolate the mounting stress, and combines it with three sets of seesaw-type self-balancing supports to form a six-point load-equalizing support structure. The two structures work together to reduce the micro-deformation of the lens from both the stress source and the lens support. The core telescope tube adopts a split frame assembly to reduce the aging deformation caused by welding residual stress. Compared with existing single improvement solutions, the combined structure of this invention can simultaneously solve the two major problems of mounting stress transmission and uneven support force, effectively reduce the surface shape error of the core spherical reference mirror, improve the accuracy of optical interferometry detection, and achieve a comprehensive effect superior to existing technologies.

[0009] Furthermore, there are three hanging ball heads, which are distributed circumferentially along the top of the stress dispersion and transfer cylinder.

[0010] Furthermore, there are six threaded holes and six connecting screws, with all six threaded holes located on the connecting ring surface.

[0011] Furthermore, there are three self-balancing support components. Each self-balancing support component includes a self-balancing pivot and forms two seesaw-type balance support points through the self-balancing pivot. The two seesaw-type balance support points are the first seesaw-type balance support point and the second seesaw-type balance support point.

[0012] Furthermore, the three self-balancing supports form a total of six seesaw-type balance support points, all of which are in contact with the inclined support surface of the reference mirror, and the force on each seesaw-type balance support point is uniform.

[0013] Furthermore, the core lens barrel consists of multiple lens frames and multiple spacer elements, with the multiple lens frames connected sequentially from top to bottom by screws.

[0014] Furthermore, the bottommost frame of the core telescope tube is a standard frame, which is integrally formed with a core spherical reference mirror and a reference mirror inclined support surface.

[0015] The present invention also includes a method for preparing a low-stress, low-deformation support lens barrel, comprising the following steps: providing a stress dispersion and transfer cylinder, and setting a mounting ball head at the top of the stress dispersion and transfer cylinder; machining multiple threaded holes on the connecting ring surface; providing a core lens barrel, with a core spherical reference mirror at the bottom of the core lens barrel, and a reference mirror inclined support surface at the bottom of the core spherical reference mirror; fitting the core lens barrel into the stress dispersion and transfer cylinder, and fixing the core lens barrel to the stress dispersion and transfer cylinder by connecting screws passing through the threaded holes; providing three self-balancing support members, with multiple support points of the self-balancing support members contacting the reference mirror inclined support surface to support the core lens barrel.

[0016] Furthermore, there are three hanging ball heads, which are distributed circumferentially along the top of the stress dispersion and transfer cylinder.

[0017] Furthermore, there are six threaded holes and six connecting screws, all of which are located on the connecting ring surface; there are three self-balancing supports, each of which includes a self-balancing shaft and forms two seesaw-type balancing support points through the shaft, namely the first seesaw-type balancing support point and the second seesaw-type balancing support point; the three self-balancing supports form a total of six seesaw-type balancing support points, all of which are in contact with the inclined support surface of the reference mirror, and the force on each seesaw-type balancing support point is uniform.

[0018] The beneficial effects of this invention are as follows: This invention features an independent stress dispersion and transfer cylinder fitted outside the core mirror tube, with the mounting ball head positioned at the top of the stress dispersion and transfer cylinder. The concentrated stress and bending moment generated by the mounting are all borne solely by the stress dispersion and transfer cylinder. By assembling with the core mirror tube through a connecting ring surface far from the root of the mounting, stress isolation and diversion are achieved, preventing the mounting load from directly twisting the core mirror tube and reducing the deformation of the core spherical reference mirror from the source.

[0019] Three self-balancing support components are used, each with its own self-balancing pivot to form two sets of seesaw-like support points, for a total of six points supporting the bottom inclined support surface of the core spherical reference mirror. The seesaw structure has self-adjusting leveling capability, is not affected by the flatness error of the mirror frame and support surface processing, and evenly distributes the weight of the lens at six points, eliminating the non-deterministic surface distortion caused by traditional planar support.

[0020] The core lens barrel is assembled by separate screws from multiple lens frames and spacer elements, without large-area welding structures, which greatly reduces welding residual stress and avoids creep deformation during long-term use; the bottom standard lens frame is integrally formed with a reference mirror and an inclined support surface, and the assembly benchmark is unified, which improves the stability of the lens support.

[0021] Six symmetrically arranged connecting screws are evenly distributed on the connecting ring surface to balance the tightening assembly stress and avoid unilateral load causing the mirror tube to twist; the three ball heads at the top are evenly distributed around the circumference and are symmetrically stressed, further reducing the eccentric deformation of the tube.

[0022] The supporting preparation method has clear steps, and the separate components are processed and assembled independently, which reduces the processing difficulty. The processing and assembly processes of each part are separated, which makes it easy to control the form and position tolerances individually and ensures high consistency in batch production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall assembly structure of a low-stress, low-deformation support lens barrel according to the present invention; Figure 2 This is an exploded view of the stress dispersion and transfer tube and the core mirror tube assembly of the present invention; Figure 3 This is a schematic diagram of the self-balancing support structure of the present invention; Figure 4 This is a schematic cross-sectional view of the standard mirror frame of the present invention.

[0024] Reference numerals: 1. Stress dispersion and transfer cylinder; 2. Hanging ball head; 3. Core mirror tube; 4. Core spherical reference mirror; 5. Self-balancing support component; 51. Self-balancing shaft; 52. First seesaw-type balance support point; 53. Second seesaw-type balance support point; 6. Connecting ring surface; 7. Connecting screw; 8. Threaded hole; 9. Reference mirror inclined support surface. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0027] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0028] Furthermore, for clarity and brevity, descriptions of well-known structures, functions, and configurations may have been omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of this disclosure.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] like Figure 1 As shown, a low-stress, low-deformation support lens barrel includes: a stress dispersion and transfer cylinder 1, a mounting ball head 2, a core lens barrel 3, and a self-balancing support 5; the mounting ball head 2 is disposed on the top of the stress dispersion and transfer cylinder 1, and the stress dispersion and transfer cylinder 1 is sleeved on the outside of the core lens barrel 3; the stress dispersion and transfer cylinder 1 and the core lens barrel 3 are connected by a connecting ring surface 6, and the connecting ring surface 6 is provided with multiple threaded holes 8; the core lens barrel 3 is fixedly connected to the stress dispersion and transfer cylinder 1 by connecting screws 7 passing through the threaded holes 8; a core spherical reference mirror 4 is disposed at the bottom of the core lens barrel 3, and a reference mirror inclined support surface 9 is disposed at the bottom of the core spherical reference mirror 4; the self-balancing support 5 contacts the reference mirror inclined support surface 9 through multiple support points to support the core lens barrel 3.

[0032] like Figure 2 As shown, there are three hanging ball heads 2, which are distributed circumferentially along the top of the stress dispersion and transfer cylinder 1.

[0033] There are six threaded holes 8 and six connecting screws 7, and all six threaded holes 8 are located on the connecting ring surface 6.

[0034] like Figure 3 As shown, there are three self-balancing support components 5. Each self-balancing support component 5 includes a self-balancing shaft 51, and forms two seesaw-type balance support points through the self-balancing shaft 51. The two seesaw-type balance support points are the first seesaw-type balance support point 52 and the second seesaw-type balance support point 53.

[0035] The three self-balancing support components 5 form a total of six seesaw-type balance support points. All six seesaw-type balance support points are in contact with the inclined support surface 9 of the reference mirror, and the force on each seesaw-type balance support point is uniform.

[0036] The core lens barrel 3 consists of multiple lens frames and multiple spacer elements, with the multiple lens frames connected sequentially from top to bottom by screws.

[0037] like Figure 4 As shown, the bottom frame of the core lens barrel 3 is a standard lens frame, which is integrally formed with a core spherical reference mirror 4 and a reference mirror inclined support surface 9.

[0038] This invention also includes a method for preparing a low-stress, low-deformation support lens barrel, comprising the following steps: providing a stress dispersion and transfer cylinder 1, with a mounting ball head 2 disposed on the top of the stress dispersion and transfer cylinder 1; machining multiple threaded holes 8 on the connecting ring surface 6; providing a core lens barrel 3, with a core spherical reference mirror 4 disposed at the bottom of the core lens barrel 3, and a reference mirror inclined support surface 9 disposed at the bottom of the core spherical reference mirror 4; fitting the core lens barrel 3 into the stress dispersion and transfer cylinder 1, and fixing the core lens barrel 3 to the stress dispersion and transfer cylinder 1 by connecting screws 7 passing through the threaded holes 8; providing three self-balancing support members 5, with multiple support points of the self-balancing support members 5 contacting the reference mirror inclined support surface 9 to support the core lens barrel 3. The number of mounting ball heads 2 is three, and the three mounting ball heads 2 are distributed circumferentially along the top of the stress dispersion and transfer cylinder 1.

[0039] There are six threaded holes 8 and six connecting screws 7, all of which are located on the connecting ring surface 6. There are three self-balancing support members 5, each of which includes a self-balancing shaft 51 and forms two seesaw-type balance support points through the self-balancing shaft 51. The two seesaw-type balance support points are the first seesaw-type balance support point 52 and the second seesaw-type balance support point 53. The three self-balancing support members 5 form a total of six seesaw-type balance support points. All six seesaw-type balance support points are in contact with the inclined support surface 9 of the reference mirror, and the force on each seesaw-type balance support point is uniform.

[0040] Existing conventional optical telescope tubes mostly adopt a one-piece tube structure. The bending moment and concentrated stress generated by the mounting load are directly transmitted to the internal spherical reference mirror, which easily causes mirror deformation. At the same time, traditional support structures mostly use single-point or four-point support in a ring plane. Affected by the flatness error of the parts processing, the support load distribution is uneven, which easily produces uncertain surface distortion. This invention adds an independent stress dispersion and transmission tube to isolate the mounting stress, and combines it with three sets of seesaw-type self-balancing supports to form a six-point load-equalizing support structure. The two structures work together to reduce the micro-deformation of the lens from both the stress source and the lens support. The core telescope tube adopts a split frame assembly to reduce the aging deformation caused by welding residual stress. Compared with existing single improvement solutions, the combined structure of this invention can simultaneously solve the two major problems of mounting stress transmission and uneven support force, effectively reduce the surface shape error of the core spherical reference mirror, improve the accuracy of optical interferometry detection, and achieve a comprehensive effect superior to existing technologies.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A micro-stress low-deformation support lens barrel, characterized by, The stress dispersion transmission cylinder (1), the hanging ball head (2), the core lens barrel (3) and the self-balancing support (5) are included. The hanging ball head (2) is arranged at the top of the stress dispersion transmission cylinder (1), and the stress dispersion transmission cylinder (1) is arranged outside the core lens barrel (3); the stress dispersion transmission cylinder (1) and the core lens barrel (3) are connected through a connecting ring surface (6), a plurality of threaded holes (8) are arranged on the connecting ring surface (6); the core lens barrel (3) is fixedly connected with the stress dispersion transmission cylinder (1) through a connecting screw (7) arranged in the threaded hole (8); the bottom of the core lens barrel (3) is provided with a core spherical reference mirror (4), and the bottom of the core spherical reference mirror (4) is provided with a reference mirror inclined support surface (9); the self-balancing support (5) is in contact with the reference mirror inclined support surface (9) through a plurality of support points, and the core lens barrel (3) is supported.

2. The low-deformation support lens barrel according to claim 1, wherein The number of the hanging ball head (2) is three, and the three hanging ball heads (2) are distributed in the circumferential direction of the top of the stress dispersion transmission cylinder (1).

3. The low-deformation support lens barrel according to claim 1, wherein The number of the threaded hole (8) and the connecting screw (7) is six, and the six threaded holes (8) are arranged on the connecting ring surface (6).

4. The low-deformation support barrel according to claim 1, wherein The number of the self-balancing support (5) is three, each self-balancing support (5) includes a self-balancing rotating shaft (51), and two seesaw type balance support points are formed through the self-balancing rotating shaft (51), and the two seesaw type balance support points are respectively a first seesaw type balance support point (52) and a second seesaw type balance support point (53).

5. A low-deformation support lens barrel according to claim 4, wherein The three self-balancing supports (5) form six seesaw type balance support points, the six seesaw type balance support points are in contact with the reference mirror inclined support surface (9), and the forces of the seesaw type balance support points are uniform.

6. The low-deformation support barrel according to claim 1, wherein The core lens barrel (3) is composed of a plurality of lens frames and a plurality of spacing elements, and the plurality of lens frames are sequentially connected by screws from top to bottom.

7. A low-deformation support lens barrel according to claim 6, wherein The lens frame at the bottom of the core lens barrel (3) is a standard lens frame, and the standard lens frame is integrally formed with the core spherical reference mirror (4) and the reference mirror inclined support surface (9).

8. A method for preparing a micro-stress low-deformation supporting lens barrel, for preparing the micro-stress low-deformation supporting lens barrel according to any one of claims 1-7, characterized in that, The following steps are included: The stress dispersion transmission cylinder (1) is provided, and the hanging ball head (2) is arranged at the top of the stress dispersion transmission cylinder (1); a plurality of threaded holes (8) are machined on the connecting ring surface (6); the core lens barrel (3) is provided, the bottom of the core lens barrel (3) is provided with a core spherical reference mirror (4), and the bottom of the core spherical reference mirror (4) is provided with a reference mirror inclined support surface (9); the core lens barrel (3) is arranged in the stress dispersion transmission cylinder (1), and the core lens barrel (3) and the stress dispersion transmission cylinder (1) are fixedly connected through the connecting screw (7) arranged in the threaded hole (8); three self-balancing supports (5) are provided, the plurality of support points of the self-balancing support (5) are in contact with the reference mirror inclined support surface (9), and the core lens barrel (3) is supported.

9. The method for preparing a low-stress, low-deformation support lens barrel according to claim 8, characterized in that, The number of the hanging ball head (2) is three, and the three hanging ball heads (2) are distributed in the circumferential direction of the top of the stress dispersion transmission cylinder (1).

10. The method of claim 8, wherein the micro stress low deformation support lens barrel is prepared by the steps of: The number of the plurality of threaded holes (8) and the connecting screws (7) is six, and the six threaded holes (8) are arranged on the connecting ring surface (6); the number of the self-balancing supporting pieces (5) is three, each self-balancing supporting piece (5) comprises a self-balancing rotating shaft (51), and two seesaw type balance supporting points are formed through the self-balancing rotating shaft (51), the two seesaw type balance supporting points are respectively a first seesaw type balance supporting point (52) and a second seesaw type balance supporting point (53); the three self-balancing supporting pieces (5) form six seesaw type balance supporting points in total, the six seesaw type balance supporting points are all in contact with the reference mirror inclined supporting surface (9), and the force of each seesaw type balance supporting point is uniform.

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