Lens support and pressing base

Abstract

The utility model discloses a lens bears and leans and strikes the base. Including base, bears and leans the piece, the base is cylindrical cylinder, the coaxial two -stage round groove of cylinder center is set up, and the diameter of first -stage round groove is greater than the diameter of second -stage round groove, the piece that bears and leans can be dismantled and is installed in second -stage round groove, and the wall surface of outer circle and second -stage round groove is pasted, the perpendicularity tolerance of the reference axle that the top plane of the piece that bears and leans is formed relative to the first -stage round groove inner cylindrical surface does not exceed 0.01mm, and is equipped with the recess in the plane center. The utility model solves the problem that the frame bearing surface is small, and the unstable strike, and the structure lens is pressed in both ends, and the other end lens is skewed.

Description

Technical Field

[0001] This utility model relates to the field of lens assembly technology, and in particular to a lens support and pressing base. Background Technology

[0002] The lens pressing process is usually carried out during the optical assembly process. Pressing can ensure that the lens is properly optically mounted, which in turn directly affects the imaging results.

[0003] Current pressure mounts use lens frames for support. Some lens frames have very small support surfaces, making them prone to tilting and deformation during pressure. Furthermore, in lens structures with lenses mounted at both ends, one lens rests on the other. Using a lens frame for support during pressure can cause the other lens to tilt, resulting in poor image quality. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a lens support and pressing base, which solves the problems of small support surface of the lens frame, unstable pressing, and lens misalignment at the other end when pressing a lens with a two-end structure.

[0005] According to one aspect of the present invention, a lens support and pressing base is provided, comprising a base and a support block;

[0006] The base is a cylindrical tube; two levels of circular grooves are coaxially opened at the center of the tube, with the diameter of the first level of circular groove being larger than the diameter of the second level of circular groove.

[0007] The support block is detachably installed in the second-stage circular groove, with its outer circle fitting against the wall of the second-stage circular groove; the perpendicularity tolerance of the top plane of the support block relative to the reference axis formed by the inner cylindrical surface of the first-stage circular groove shall not exceed 0.01mm, and a groove is provided at the center of the plane.

[0008] In the above technical solution, the lens bearing and pressing base uses a minimalist structure of "cylindrical tube - two-stage circular groove - detachable precision bearing block". It changes the original point / line contact that relied on the end face of the lens frame to the strict vertical constraint of the large plane of the bearing block and the reference axis. This not only increases the effective bearing area, but also directly transmits the axial pressure to the reference surface closest to the lens to be mounted. This solves the two major problems of "small bearing surface of the lens frame → skew" and "mounting lenses at both ends → the lens at the other end is tilted by the force". It also provides a reproducible precision reference for subsequent optical mounting.

[0009] The two-stage circular groove divides the assembly chain in two: the first-stage circular groove provides high coaxial positioning with the outer diameter of the lens barrel, and the second-stage circular groove is used to lock the detachable support block, enabling rapid changeover of the "base-support block" assembly and individual rework after wear, reducing the life cycle cost of the fixture; the perpendicularity of the top surface of the support block relative to the reference axis is ≤0.015mm, which is equivalent to directly compressing the 0.05-0.10mm form and position tolerance of the traditional lens frame end face by an order of magnitude. When pressed, the angle between the force surface of the lens and the optical axis is locked, which greatly suppresses the image plane shift and astigmatism caused by tilting; the top groove makes way for the convex or cemented surface of the lens while maintaining the flat support, avoiding the local stress concentration caused by "hard collision", so that the far-end lens mounted at both ends is no longer passively tilted due to axial compression, thereby ensuring the coaxiality and spacing accuracy of the entire lens assembly.

[0010] In some embodiments, the outer wall of the base has an integrally formed mounting flange.

[0011] In the above technical solution, the flange and base are integrally machined, and their end faces and the reference axis of the cylinder are processed in a single process. This can directly shorten the form and position tolerance chain to three elements: "cylinder-flange-support block", eliminating the coaxial adjustment link of the traditional split flange and greatly reducing assembly errors. Secondly, the flange has threads or pin holes evenly distributed around its circumference, forming a four-point / six-point hard connection with the optical mounting machine. During pressurization, the axial reaction force is distributed to the machine through the flange, and the cylinder wall no longer bears bending moment, avoiding slight deflection that could cause the reference surface of the support block to tilt, thereby protecting the lens at the other end from lateral forces. The outer edge of the flange can also serve as a protective stop, acting as a temporary positioning ring for the second lens in the lens mounting process at both ends, reducing the number of changeover fixtures.

[0012] In some embodiments, the first-stage circular groove wall is provided with at least one vent hole.

[0013] In the above technical solution, at least one vent is added to the wall of the first-stage circular groove, allowing air that might have been trapped in the groove due to the "piston effect" to be released instantly. This eliminates the attitude disturbance caused by air pressure rebound when the lens is lowered and avoids the difficulty of taking it out and putting it in due to negative pressure suction. As a result, the entire structure maintains a stable, clean, and repeatable optical reference throughout the entire pressurization process. The vent directly connects the first-stage circular groove to the outside atmosphere. When the lens or lens barrel is pressed in, the internal air can be quickly depressurized along the vent, preventing the phenomenon of the air cushion pushing the lens out of place. The vent is located on the side wall, which not only prevents dust from falling vertically but also serves as an airflow channel during vacuuming or clean nitrogen replacement, maintaining the cleanliness of the groove and reducing secondary contamination of the support surface and lens by particles.

[0014] In some embodiments, a threaded hole is provided at the center of the bottom of the second-stage circular groove; a threaded post that mates with the threaded hole is provided at the center of the bottom surface of the bearing block.

[0015] In the above technical solution, a threaded hole is added to the center of the bottom of the second-stage circular groove, and a threaded post that mates with it is set coaxially on the bottom surface of the bearing block, so that a three-in-one composite constraint of "face-hole-thread" is formed between the bearing block and the base. This not only completely eliminates the axial micro-jump and circumferential micro-rotation of the bearing block during pressure, but also realizes tool-free quick disassembly and assembly, further consolidating the high precision, high consistency and high maintainability of the entire base.

[0016] The cylindrical surface of the second groove has limited the radial runout of the bearing block. After the central threaded column is screwed in, a constant axial preload is generated. The bearing block fits against the bottom of the groove, and the perpendicularity of the bearing block plane relative to the reference axis remains unchanged within 0.015mm. After the thread is locked, the top plane of the bearing block and the bottom of the groove form a rigid closed ring. The threaded column itself acts as a reinforcing rib, improving the local rigidity of the bearing block and further suppressing micro-deformation during pressing.

[0017] In some embodiments, the base is made of stainless steel; the support block is made of PEEK.

[0018] In the above technical solution, the base is made of stainless steel and the support block is made of PEEK. Stainless steel ensures that the overall geometric accuracy does not drift under long-term pressure and repeated clamping, while PEEK, with its light weight, low friction and low particle shedding characteristics, forms a flexible buffer between the lens and the metal reference, which not only prevents edge chipping and stress concentration caused by hard collision, but also avoids fretting wear caused by metal-metal dry friction.

[0019] Stainless steel can withstand hundreds of thousands of pressure cycles without plastic deformation; its coefficient of thermal expansion is close to that of the frame metal parts, and the reference axis offset caused by temperature drift is controllable, ensuring optical coaxiality can be maintained even in high and low temperature workshops. PEEK can generate uniform surface pressure between the convex or bonded surface of the lens and the supporting surface, reducing local contact stress and suppressing the "Newton's rings" indentation and edge chipping that are prone to occur in traditional metal bases. At the same time, PEEK has a low coefficient of friction, resulting in low resistance when picking up and placing lenses, avoiding secondary impacts caused by vacuum adsorption or robotic gripping. PEEK has natural resistance to chemical corrosion and low particulate properties, showing almost no mass loss in IPA, acetone wiping and UV aging tests in cleanrooms. It does not shed powder or generate static electricity with long-term use, protecting the lens coating and reducing the risk of particulate contamination; its low density reduces the weight of the supporting block, decreasing the inertial torque during threaded pin locking, making manual changeover easier and reducing the load on the machine's motion axes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the lens support and pressing base of this utility model;

[0022] Figure 2 This is a top view and a cross-sectional schematic diagram of an embodiment of a lens support and pressing base of this utility model;

[0023] Figure 3 This is a schematic diagram of the pressure application of an embodiment of the lens support and pressure base of this utility model. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are only for illustrating the present invention and do not limit the scope of the present invention. Similarly, the following embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0025] Example 1

[0026] like Figures 1 to 3 As shown, a lens support and pressing base includes a base 1 and a support block 2;

[0027] The base 1 is a cylindrical tube; two levels of circular grooves are opened coaxially at the center O of the tube, and the diameter of the first level circular groove 10 is larger than the diameter of the second level circular groove 11.

[0028] The support block 2 is detachably installed on the second-stage circular groove 11, and its outer circle fits against the wall of the second-stage circular groove 11. The perpendicularity tolerance of the top plane A of the support block 2 relative to the reference axis O formed by the inner cylindrical surface 12 of the first-stage circular groove 10 shall not exceed 0.01mm, and a groove 21 is provided at the center of the plane A.

[0029] In this embodiment, the outer wall of the base 1 has an integrally formed mounting flange 13.

[0030] In this embodiment, at least one vent hole 14 is provided on the wall of the first-stage circular groove 10.

[0031] In this embodiment, a threaded hole 15 is provided at the center of the bottom of the second-stage circular groove 11; a threaded post 22 that mates with the threaded hole 15 is provided at the center of the bottom surface of the bearing block 2.

[0032] In this embodiment, the base 1 is made of stainless steel; the support block 2 is made of PEEK.

[0033] In this embodiment, the working principle is as follows:

[0034] Please see Figure 3 Because of the tolerance control of the base 1 and the support block 2, the perpendicularity of the cylindrical surface 101 in the first-stage circular groove 10 to the plane A is guaranteed, thereby ensuring the concentricity of the lens C1 and the support block 2 after the lens C is placed in. Because the base 1 includes a vent 13, the lens C will not be trapped after being placed in, thus keeping the lens C1 horizontal after it rests on the support block 2, so that the pressure is applied vertically to the lens C1 during pressing, thus pressing it in place. Because the base 1 is made of SUS304 stainless steel and the support block 2 is made of PEEK material, the lens is not damaged while ensuring strength.

[0035] The above description is only a part of the embodiments of this utility model, and does not limit the scope of protection of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.

Claims

1. A lens support and pressing base, characterized in that, Includes base and support block; The base is a cylindrical tube; two levels of circular grooves are coaxially opened at the center of the tube, with the diameter of the first level of circular groove being larger than the diameter of the second level of circular groove. The support block is detachably installed in the second-stage circular groove, with its outer circle fitting against the wall of the second-stage circular groove; the perpendicularity tolerance of the top plane of the support block relative to the reference axis formed by the inner cylindrical surface of the first-stage circular groove shall not exceed 0.01mm, and a groove is provided at the center of the plane.

2. The lens support and pressing base as described in claim 1, characterized in that, The base has an integrally formed mounting flange on its outer wall.

3. The lens support and pressing base as described in claim 1, characterized in that, The first-stage circular groove wall is provided with at least one vent hole.

4. The lens support and pressing base as described in claim 1, characterized in that, The second-stage circular groove has a threaded hole at its center; the bearing block has a threaded post at its center that mates with the threaded hole.

5. A lens support and pressing base as described in claim 1, characterized in that, The base is made of stainless steel; the support block is made of PEEK.

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