A focusing lens barrel machining fixture

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By designing a focusing lens barrel machining fixture with an adjustable outer diameter fixed shaft and an L-shaped moving seat, the problem of the narrow adaptability range of existing fixtures has been solved, improving production efficiency and machining accuracy, and extending the service life of the fixture.

CN224509435UActive Publication Date: 2026-07-17THE OPTICAL ELEMENT FACTORY OF THE INST OF OPTICS & ELECTRONICS THE CHINESE ACADEMY OF SCI

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: THE OPTICAL ELEMENT FACTORY OF THE INST OF OPTICS & ELECTRONICS THE CHINESE ACADEMY OF SCI
Filing Date: 2025-07-23
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

The existing focusing lens barrel machining fixtures have a narrow range of compatibility, resulting in frequent fixture changes, increased equipment downtime, reduced production efficiency, and the accumulation of positioning errors due to multiple clamping, which affects the machining accuracy of curved grooves.

Method used

A focusing lens barrel machining fixture was designed, comprising a fixed base, a first fixed shaft, an annular boss, and a second fixed shaft. The outer diameter of the first fixed shaft is adjustable. Combined with an L-shaped moving seat and a scale, it can be adapted to lens barrels with different inner diameter specifications. Magnetic suction and threaded connection ensure stable clamping. Wear-resistant hard alloy material is used to reduce wear.

Benefits of technology

It expands the range of fixture compatibility, reduces equipment downtime, improves production efficiency, ensures the machining accuracy and consistency of curved grooves, reduces human error, and extends the service life of fixtures.

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Abstract

This utility model relates to the field of focusing lens barrel processing technology, specifically to a focusing lens barrel processing fixture, including a fixed base and an end plate. The fixed base consists of a first fixed shaft, an annular boss, and a second fixed shaft. The outer diameter of at least one end of the first fixed shaft is adjustable and it has a pin hole in its radial direction. The rear end of the first fixed shaft is connected to the front end of the annular boss, and the rear end of the annular boss is connected to the front end of the second fixed shaft. The end plate is detachably connected to the front end of the first fixed shaft, and a clamping area for mounting the focusing lens barrel to be processed is formed between the end plate and the annular boss. This utility model, by adjusting the outer diameter of at least one end of the first fixed shaft, in conjunction with the clamping area formed by the end plate and the annular boss, allows the outer diameter of the first fixed shaft to be adjusted to adapt to focusing lens barrels with different inner diameter specifications. This eliminates the need for frequent fixture changes due to changes in the inner diameter of the lens barrel, reduces equipment downtime, and improves production efficiency, making it particularly suitable for batch processing scenarios of multi-specification products.

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Description

Technical Field

[0001] This utility model relates to the field of focusing lens barrel processing technology, and more specifically, to a focusing lens barrel processing fixture. Background Technology

[0002] In the field of optical instrument manufacturing, the focusing lens barrel, as a core component for adjusting the lens focal length, often requires the machining of curved grooves with specific trajectories on its outer wall. This is to cooperate with the guiding structure in the optical system to achieve precise focusing. Therefore, the machining accuracy of the curved grooves directly affects the sliding stability of the focusing lens barrel and the imaging consistency of the optical system. The focusing lens barrel is usually a cylindrical structure. When machining the curved grooves on the outer wall, a fixture is needed to achieve stable clamping and avoid deviations in the curved groove trajectory or surface damage caused by vibration or offset.

[0003] Existing focusing lens barrel machining fixtures mostly employ rigid structures of fixed dimensions, with a fixed range of inner diameter adaptation for their clamping area, only suitable for focusing lens barrels with specific inner diameter specifications. However, in actual production, the inner diameter parameters of the focusing lens barrel need to be adjusted according to the assembly requirements of different optical systems, resulting in a single fixture often only corresponding to one inner diameter model, leading to poor versatility. Frequent fixture changes not only increase equipment downtime and reduce production efficiency but also cause cumulative positioning errors due to multiple clamping operations, affecting the machining accuracy of curved grooves.

[0004] Therefore, there is an urgent need for a focusing lens barrel machining fixture that can be adapted to different inner diameter specifications, in order to solve the problems of narrow adaptation range and unstable machining accuracy of existing focusing lens barrel machining fixtures. Utility Model Content

[0005] The purpose of this utility model is to provide a focusing lens barrel processing fixture to solve the technical problems of narrow adaptability and unstable machining accuracy of existing focusing lens barrel processing fixtures.

[0006] This utility model is achieved through the following technical solution: a focusing lens barrel processing fixture, including a fixed base and an end plate. The fixed base is composed of a first fixed shaft, an annular boss and a second fixed shaft. The outer diameter of at least one end of the first fixed shaft is adjustable and a pin hole is opened radially thereon. The rear end of the first fixed shaft is connected to the front end of the annular boss, and the rear end of the annular boss is connected to the front end of the second fixed shaft. The end plate is detachably connected to the front end of the first fixed shaft. A clamping area for installing the focusing lens barrel to be processed is formed between the end plate and the annular boss.

[0007] According to a preferred embodiment, the outer diameter of the rear end of the first fixed shaft is adjustable. The first fixed shaft is composed of a shaft base and a first movable seat disposed on at least two sides of the rear end of the shaft base. The outer side of the first movable seat is an arc-shaped surface. The annular boss is composed of a boss body and a second movable seat disposed on at least two sides of the front end of the boss body and corresponding to the first movable seat. The first movable seat and the second movable seat together form an L-shaped movable seat. The L-shaped movable seat is slidably connected to the front end of the annular boss.

[0008] According to a preferred embodiment, the front end of the second movable seat is provided with a waist groove, and the front end of the boss body is provided with a first screw hole corresponding to the waist groove.

[0009] According to a preferred embodiment, the front end of the boss body is provided with a scale, which is located on one side of the front end of the second movable seat.

[0010] According to a preferred embodiment, the first fixed shaft is made of wear-resistant cemented carbide.

[0011] According to a preferred embodiment, a second screw hole is provided at the front end of the first fixed shaft, and the cover plate is threadedly connected to the front end of the first fixed shaft through the second screw hole.

[0012] According to a preferred embodiment, a magnetic attraction element is provided between the cover plate and the first fixed shaft.

[0013] According to a preferred embodiment, the rear end of the cover plate and the front end of the annular boss are both provided with gaskets on the periphery of the first fixed shaft.

[0014] The technical solution of the focusing lens barrel processing fixture provided by this utility model has at least the following advantages and beneficial effects: (1) The outer diameter of at least one end of the first fixed shaft is adjustable. With the clamping area formed by the end plate and the annular boss, the outer diameter of the first fixed shaft can be adjusted to adapt to focusing lens barrels with different inner diameter specifications. There is no need to frequently change the fixture due to changes in the inner diameter of the lens barrel, which reduces equipment downtime and improves production efficiency. It is especially suitable for batch processing of multi-specification products; (2) The L-shaped moving seat formed by the first moving seat and the second moving seat is slidably connected to the front end of the annular boss. With the cooperation of the waist groove and the first screw hole, the outer diameter of the first fixed shaft can be precisely adjusted to ensure uniform clamping force for lens barrels with different inner diameters and avoid processing (3) The scale at the front end of the boss provides a precise reference for the adjustment process, reduces the error of manual operation, ensures the consistency of clamping and positioning of the same batch of mirror tubes, and improves the dimensional accuracy and trajectory consistency of the curved groove; (4) The end plate and the first fixed shaft are fixed by threaded connection and magnetic attraction, which is convenient to install and disassemble and the connection is stable, reducing the time cost of clamping operation; (5) The first fixed shaft is made of wear-resistant hard alloy, which can effectively reduce wear in long-term use and avoid the decrease in positioning accuracy caused by shaft clearance; the shims at the corresponding positions of the end plate and the annular boss further buffer the clamping force, protect the mirror tube surface from damage, and extend the service life of the fixture itself. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the focusing lens barrel processing fixture provided in Embodiment 1 of this utility model; Figure 2 A side view of the focusing lens barrel processing fixture provided in Embodiment 1 of this utility model; Figure 3 This is a top view of the focusing lens barrel processing fixture provided in Embodiment 1 of this utility model; Figure 4 This is a side view of the focusing lens barrel processing fixture in the clamping state provided in Embodiment 1 of this utility model; Figure 5 This is a top view of the focusing lens barrel processing fixture in the clamping state provided in Embodiment 1 of this utility model; Figure 6 A longitudinal cross-sectional schematic diagram of the focusing lens barrel processing fixture in the clamping state provided in Embodiment 1 of this utility model; Reference numerals: 100-fixed base, 110-first fixed shaft, 111-pin hole, 112-shaft base, 113-first movable seat, 114-second screw hole, 120-annular boss, 121-bore body, 122-second movable seat, 123-waist groove, 124-first screw hole, 130-second fixed shaft, 200-end plate, 300-clamping area, 400-focusing lens barrel to be processed. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Example 1 This embodiment provides a focusing lens barrel machining fixture. Figure 1 This is a schematic diagram of the focusing lens barrel machining fixture. (See attached diagram) Figure 1 As shown, the focusing lens barrel processing fixture includes a fixed base 100 and an end plate 200.

[0018] The fixed base 100 is composed of a first fixed shaft 110, an annular boss 120 and a second fixed shaft 130. The outer diameter of at least one end of the first fixed shaft 110 is adjustable, which can be adapted to focusing lens barrels with different inner diameters, thus broadening the applicability of the clamp.

[0019] The first fixed shaft 110 has a pin hole 111 in the radial direction. The pin hole 111 can be used with a positioning pin to realize the circumferential limit of the lens barrel, prevent the lens barrel from rotating relative to the fixture during processing, ensure the accuracy of the curved groove processing trajectory, and make the fixture have both versatility and positioning stability.

[0020] The rear end of the first fixed shaft 110 is connected to the front end of the annular boss 120. In some preferred embodiments, the outer diameter of the rear end of the first fixed shaft 110 is adjustable. The first fixed shaft 110 is composed of a shaft base 112 and first movable seats 113 located on at least two sides of the rear end of the shaft base 112. The design of the shaft base 112 and the first movable seats 113 on at least two sides in this embodiment allows the rear end outer diameter to be changed by adjusting the distance between the first movable seats 113, thereby adapting to lens barrels with different inner diameters. The first movable seats 113 arranged on at least two sides can make the force on the inner side of the lens barrel more uniform, prevent local compression from causing lens barrel deformation, and ensure the stability of the lens barrel structure during the processing of the curved groove.

[0021] The outer side of the first movable seat 113 is an arc-shaped surface, which increases the contact area, disperses the clamping force, and prevents dents and deformations from occurring on the inner side of the lens barrel due to stress concentration. At the same time, it allows the lens barrel to fit more tightly with the fixture, making the lens barrel less prone to shaking during processing and improving the positional accuracy of the curved groove processing.

[0022] The end plate 200 is detachably connected to the front end of the first fixed shaft 110. The end plate 200 and the annular boss 120 form a clamping area 300 for mounting the focusing lens barrel 400 to be processed. Specifically, the outer diameter of the first fixed shaft 110 is adjustable. With the clamping area 300 formed by the end plate 200 and the annular boss 120, the outer diameter of the first fixed shaft 110 can be adjusted to adapt to focusing lens barrels with different inner diameter specifications. This eliminates the need to frequently change the fixture due to changes in the inner diameter of the lens barrel, reduces equipment downtime, and improves production efficiency. It is especially suitable for batch processing scenarios of multi-specification products.

[0023] See Figure 2 As shown, the annular boss 120 is composed of a boss body 121 and a second movable seat 122 located at least on both sides of the front end of the boss body 121 and corresponding to the first movable seat 113; see also Figure 3 As shown, the front end of the second movable seat 122 is provided with a waist groove 123, and the front end of the boss body 121 is provided with a first screw hole 124 corresponding to the waist groove 123; further, the first movable seat 113 and the second movable seat 122 together form an L-shaped movable seat, which is slidably connected to the front end of the annular boss 120; specifically, in this embodiment, through the cooperation of the waist groove 123 and the first screw hole 124, after the bolt is inserted, it not only provides guidance for the adjustment of the L-shaped movable seat, but also locks the adjustment position, allowing the L-shaped movable seat to slide within a certain range to adapt to different outer diameter requirements. After adjustment, the structure is kept stable by tightening the bolt, making the fixture adjustment convenient and the clamping reliable, improving the stability during processing. For the clamping state of the focusing lens barrel processing fixture, see Figures 4 to 6 As shown.

[0024] The front end of the boss body 121 is provided with a scale, which is located on one side of the front end of the second moving seat 122. Specifically, the scale provides a precise reference for the adjustment process, reduces errors in manual operation, ensures the consistency of clamping and positioning of the same batch of lens barrels, and improves the dimensional accuracy and trajectory consistency of the curved groove.

[0025] The rear end of the annular boss 120 is connected to the front end of the second fixed shaft 130. The rear end of the second fixed shaft 130 is used to install on the shaft of the machining center. The rear end of the second fixed shaft 130 can be equipped with a flange or a mounting interface to achieve installation and fixation. The specific details will not be elaborated here.

[0026] The first fixed shaft 110 has a plurality of pin holes 111 with different inner diameters spaced radially. Specifically, the plurality of pin holes 111 with different inner diameters radially opened on the first fixed shaft 110 can be used with positioning pins to achieve rapid positioning of the lens barrel, avoid circumferential offset during clamping, and ensure the accuracy of the machining position of the curved groove.

[0027] The first fixed shaft 110 is made of wear-resistant hard alloy. The wear-resistant hard alloy can effectively reduce wear during long-term use and avoid the decrease in positioning accuracy caused by shaft clearance. The front end of the first fixed shaft 110 is provided with a second screw hole 114. The cover plate is threaded to the front end of the first fixed shaft 110 through the second screw hole 114. A magnetic attraction component is provided between the cover plate and the first fixed shaft 110. Specifically, the end plate 200 and the first fixed shaft 110 are fixed by threaded connection and magnetic attraction component, which makes installation and disassembly convenient and the connection stable, reducing the time cost of clamping operation.

[0028] Gaskets are provided on the rear end of the cover plate and the front end of the annular boss 120 corresponding to the periphery of the first fixed shaft 110. Specifically, the gaskets at the corresponding positions of the end plate 200 and the annular boss 120 further buffer the clamping force, protect the lens barrel surface from damage, and extend the service life of the fixture itself.

[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A focusing lens barrel processing jig characterized by comprising: The device includes a fixed base (100) and an end plate (200). The fixed base (100) is composed of a first fixed shaft (110), an annular boss (120) and a second fixed shaft (130). The outer diameter of at least one end of the first fixed shaft (110) is adjustable and a pin hole (111) is provided radially thereon. The rear end of the first fixed shaft (110) is connected to the front end of the annular boss (120). The rear end of the annular boss (120) is connected to the front end of the second fixed shaft (130). The end plate (200) is detachably connected to the front end of the first fixed shaft (110). A clamping area (300) for mounting the focusing lens barrel (400) to be processed is formed between the end plate (200) and the annular boss (120).

2. The focusing lens barrel machining jig according to Claim 1, wherein The outer diameter of the rear end of the first fixed shaft (110) is adjustable. The first fixed shaft (110) is composed of a shaft base (112) and a first movable seat (113) located on at least two sides of the rear end of the shaft base (112). The outer side of the first movable seat (113) is an arc-shaped surface. The annular boss (120) is composed of a boss body (121) and a second movable seat (122) located on at least two sides of the front end of the boss body (121) and corresponding to the first movable seat (113). The first movable seat (113) and the second movable seat (122) together form an L-shaped movable seat. The L-shaped movable seat is slidably connected to the front end of the annular boss (120).

3. The focusing lens barrel machining jig according to claim 2, wherein The front end of the second movable seat (122) is provided with a waist groove (123), and the front end of the boss body (121) is provided with a first screw hole (124) corresponding to the waist groove (123).

4. The focusing lens barrel machining jig according to Claim 3, wherein The front end of the boss body (121) is provided with a scale, which is located on one side of the front end of the second movable seat (122).

5. The focusing lens barrel machining jig according to Claim 1, wherein The first fixed shaft (110) is made of wear-resistant hard alloy.

6. The focusing lens barrel machining jig according to Claim 1, wherein The first fixed shaft (110) has a second screw hole (114) at its front end, and the cover plate is threaded to the front end of the first fixed shaft (110) through the second screw hole (114).

7. The focusing barrel machining fixture of claim 1, wherein, A magnetic attraction element is provided between the cover plate and the first fixed shaft (110).

8. The focus barrel machining fixture of claim 1, wherein, Gaskets are provided on the rear end of the cover plate and the front end of the annular boss (120) corresponding to the periphery of the first fixed shaft (110).