Eccentricity measuring tool for lens of transmission-type centrescope

By designing a lens eccentricity measurement tool for a transmission-type centering instrument and adopting precise positioning and auxiliary limiting structures, the problems of insufficient measurement accuracy and versatility of existing transmission-type centering instruments are solved, and high-precision and widely adaptable lens eccentricity measurement is achieved.

CN223332597UActive Publication Date: 2025-09-12HEBEI CHANGHONG PHOTOELECTRIC TECH CO LTD
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Patent Information

Application Number
CN202422802242.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-18
Publication Date
2025-09-12
Estimated Expiration
2034-11-18

AI Technical Summary

Technical Problem

The existing transmission-type centering instrument lens eccentricity measurement method has low accuracy and versatility, and is difficult to meet the measurement requirements of high precision and a variety of lens sizes.

Method used

A lens eccentricity measurement fixture for a transmission-type centering instrument is designed. The fixture adopts a combined structure of a first slider, a limit block, a threaded rod, a positioning pin and a limit slot, and cooperates with a slide rod, a slider, a positioning shaft, a roller and a rubber sleeve to achieve precise positioning and auxiliary limiting of the lens, ensuring that the optical center is aligned with the measurement reference.

Benefits of technology

The accuracy of lens eccentricity measurement and the versatility of the equipment are improved, and the rapid adjustment of lenses of different sizes can be adapted, thereby reducing measurement errors and preventing measurement errors caused by lens center offset.

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Abstract

The utility model belongs to the technical field of optical lens measurement, and particularly relates to a lens eccentricity measuring tool for a transmission type centres.The lens eccentricity measuring tool comprises a base, a stand column is fixedly arranged at the top of the base, and a mounting frame is fixedly arranged on one side of the stand column. The center of the locating pin corresponds to the center of the light through hole, the locating pin is rotated anticlockwise, the bottom of the locating pin is separated from the lens table, then the two locating pins move towards the direction close to the lens, and when the locating pins are attached to the outer edge of the lens, pulling of the locating pins is stopped, the locating pins rotate clockwise, and the locating pins are fixed in the first locating groove. Through the arrangement of the positioning pin and the first positioning groove, the optical center of the lens can be accurately aligned with the measurement reference, errors are reduced to the maximum extent, more accurate eccentric values can be obtained in the measurement process, the measurement precision is improved, the positioning pin with the position capable of being rapidly adjusted can adapt to lenses of different sizes, and the universality of equipment is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of optical lens measurement, in particular to a tool for measuring the eccentricity of a lens used in a transmission-type centering instrument. Background Art

[0002] In the field of optics, lens quality plays a crucial role in the performance of optical systems. Lens decentering is a key factor affecting its quality. With the continuous advancement of technology, optical systems are increasingly used in various fields, such as digital cameras, smartphones, and optical instruments. These devices place increasingly high demands on lens precision. Therefore, accurately measuring lens decentering has become particularly important. Transmissive centering devices are the most commonly used instruments for optical measurement.

[0003] However, the existing transmission type centering instrument usually uses mechanical contact measurement to measure the lens eccentricity, which has low accuracy and versatility. Therefore, a tool for measuring the eccentricity of the lens of a transmission type centering instrument is proposed. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a tool for measuring the eccentricity of a lens of a transmission type centering instrument.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a tool for measuring the eccentricity of a lens of a transmission-type centering instrument, comprising a base, a column is fixedly provided on the top of the base, a mounting bracket is fixedly provided on one side of the column, an upper light beam emitting assembly is provided on the mounting bracket, a connecting seat is fixedly provided on the top of the base, a lower light beam emitting assembly is provided on the top of the connecting seat, a chassis is fixedly provided on the top of the lower light beam emitting assembly, a mirror stage is fixedly provided on the top of the chassis, two first positioning grooves and two second positioning grooves are provided on the mirror stage, a positioning structure is provided in each of the two first positioning grooves, and a limit assembly is provided in one of the second positioning grooves.

[0006] As a further description of the above technical solution:

[0007] First limiting grooves are provided on both sides of the inner walls of the first positioning groove, and second limiting grooves are provided on both sides of the inner walls of the second positioning groove.

[0008] As a further description of the above technical solution:

[0009] The stage is provided with four mounting holes in a circular equidistant array, each of the mounting holes is movably provided with a top screw, and the stage and the chassis are fixedly connected by the top screw.

[0010] As a further description of the above technical solution:

[0011] The positioning structure includes a first sliding block movably connected to the first positioning groove, a threaded rod is movably provided on the top of the first sliding block, and a positioning pin is fixedly provided on the top of the threaded rod.

[0012] As a further description of the above technical solution:

[0013] First limiting blocks are fixedly provided on both sides of the first sliding block, the first limiting blocks are movably connected to the first limiting grooves, an internal threaded hole is provided on the top of the first sliding block, and the threaded rod is adapted to the internal threaded hole.

[0014] As a further description of the above technical solution:

[0015] The limiting assembly includes a sliding rod fixedly connected to the second positioning groove, a second slider movably provided on the sliding rod, second limiting blocks fixedly provided on both sides of the second slider, the second limiting block and the second limiting groove movably connected, a positioning shaft fixedly provided on the top of the second slider, and a roller movably provided on the top of the positioning shaft.

[0016] As a further description of the above technical solution:

[0017] A spring is sleeved on the slide bar, one end of the spring is fixedly connected to one side of the second slider, the other end of the spring is fixedly connected to one side of the second positioning groove, and a rubber sleeve is sleeved on the outside of the rotating roller.

[0018] As a further description of the above technical solution:

[0019] A circular hole is provided at the bottom of the rotating roller, a bearing is fixedly provided in the circular hole, and an inner ring of the bearing is fixedly sleeved on the positioning shaft.

[0020] The utility model has the following beneficial effects:

[0021] 1. Compared with the prior art, the lens eccentricity measurement tool for a transmission-type centering instrument is provided with a first slider, a first limit block, an internal threaded hole, a threaded rod, a positioning pin and a first positioning groove. During measurement, the lens to be measured is placed on the top of the stage, and the center of the lens is aligned with the center of the light-through hole on the stage. The positioning pin is then rotated counterclockwise to disengage its bottom from the top of the stage. The two positioning pins are then simultaneously moved in a direction close to the lens. When the positioning pin is in contact with the outer edge of the lens, the positioning pin is stopped from being pulled and rotated clockwise to be fixed in the first positioning groove. By providing the positioning pin and the first positioning groove, the optical center of the lens can be accurately aligned with the measurement reference, thereby minimizing the error, helping to obtain a more accurate eccentricity value during the measurement process, and improving the measurement accuracy. The positioning pin, which can be quickly adjusted in position, can adapt to lenses of different sizes, thereby improving the versatility of the equipment.

[0022] 2. Compared with the existing technology, the tooling for measuring the eccentricity of the lens of a transmission-type centering instrument is provided with a sliding rod, a second sliding block, a second limiting block, a positioning shaft, a rotating roller and a rubber sleeve. After completing the preliminary positioning, the rotating roller is released. Under the thrust of the spring, the second sliding block drives the positioning shaft to reset, and the positioning shaft drives the rotating roller. The rubber sleeve on the outside of the rotating roller can fit with the outer edge of the lens to achieve auxiliary limiting of the lens. When the lens is manually rotated one circle and the sensor is used to measure the motion trajectory of the image point after the light beam passes through the lens to analyze the eccentricity, it can prevent the center of the lens and the center of the light hole from shifting, resulting in a large difference in the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of a tool for measuring the eccentricity of a lens of a transmission-type centering instrument proposed in the present invention;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of a lens stage in a tooling for measuring lens eccentricity of a transmission-type centering instrument proposed in the present invention;

[0025] Figure 3 This is a front cross-sectional schematic diagram of a lens stage in a tooling for measuring lens eccentricity of a transmission type centering instrument proposed in the present invention;

[0026] Figure 4 This is an exploded schematic diagram of a positioning structure in a tool for measuring lens eccentricity of a transmission-type centering instrument proposed in the present invention;

[0027] Figure 5 The present invention provides an exploded schematic diagram of a limit assembly in a tool for measuring lens eccentricity of a transmission-type centering instrument.

[0028] Legend:

[0029] 1. Base; 2. Column; 3. Mounting frame; 4. Upper beam emitting assembly; 5. Connecting seat; 6. Lower beam emitting assembly; 7. Mirror stage; 8. First positioning slot; 9. Second positioning slot; 10. First limiting slot; 11. Second limiting slot; 12. Positioning structure; 121. First slider; 122. First limiting block; 123. Internal threaded hole; 124. Threaded rod; 125. Positioning pin; 13. Limiting assembly; 131. Sliding rod; 132. Second slider; 133. Second limiting block; 134. Positioning shaft; 135. Roller; 136. Rubber sleeve; 14. Chassis. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0031] Reference Figures 1 to 5 The utility model provides a tool for measuring the eccentricity of a lens of a transmission-type centering instrument: it includes a base 1, a column 2 is fixedly provided on the top of the base 1, a mounting bracket 3 is fixedly provided on one side of the column 2, an upper light beam emitting assembly 4 is provided on the mounting bracket 3, a connecting seat 5 is fixedly provided on the top of the base 1, a lower light beam emitting assembly 6 is provided on the top of the connecting seat 5, a chassis 14 is fixedly provided on the top of the lower light beam emitting assembly 6, a mirror stage 7 is fixedly provided on the top of the chassis 14, four mounting holes in a circular equidistant array are provided on the stage 7, top screws are movably provided in the mounting holes, the mirror stage 7 and the chassis 14 are fixedly connected by top screws, two first positioning grooves 8 and two second positioning grooves 9 are provided on the stage 7, first limiting grooves 10 are provided on the inner walls on both sides of the first positioning groove 8, and second limiting grooves 11 are provided on the inner walls on both sides of the second positioning groove 9;

[0032] In order to achieve the purpose of improving measurement accuracy and improving versatility, a positioning structure 12 is provided in each of the two first positioning grooves 8. The positioning structure 12 includes a first slider 121 movably connected to the first positioning groove 8. Both sides of the first slider 121 are fixed with a first limit block 122. The first limit block 122 is movably connected to the first limit groove 10. A threaded rod 124 is movably provided on the top of the first slider 121. An internal threaded hole 123 is provided on the top of the first slider 121. The threaded rod 124 and the internal threaded hole 123 are adapted. A positioning pin 125 is fixed on the top of the threaded rod 124 to place the lens to be measured. At the top of the stage 7, the positioning pin 125 is rotated counterclockwise, the positioning pin 125 moves up and the bottom of the positioning pin 125 is out of contact with the top of the stage 7, and then the two positioning pins 125 are moved simultaneously in the direction close to the lens. When the positioning pin 125 is in contact with the outer edge of the lens, the positioning pin 125 is stopped and rotated clockwise. By setting the positioning pin 125 and the first positioning groove 8, the optical center of the lens can be accurately aligned with the measurement reference, minimizing the error, helping to obtain more accurate eccentricity values ​​during the measurement process, and improving the measurement accuracy. The positioning pin 125 that can be quickly adjusted can adapt to lenses of different sizes, improving the versatility of the equipment;

[0033] In order to achieve the purpose of auxiliary limit, a limit assembly 13 is provided in one of the second positioning grooves 9. The limit assembly 13 includes a slide rod 131 fixedly connected to the second positioning groove 9, and a second slider 132 is movably provided on the slide rod 131. A spring is sleeved on the slide rod 131, and one end of the spring is fixedly connected to one side of the second slider 132, and the other end of the spring is fixedly connected to one side of the second positioning groove 9. Second limit blocks 133 are fixedly provided on both sides of the second slider 132, and the second limit block 133 is movably connected to the second limit groove 11. A positioning shaft 134 is fixedly provided on the top of the second slider 132, and a roller 135 is movably provided on the top of the positioning shaft 134. The roller 135 A circular hole is provided at the bottom of 35, in which a bearing is fixed. The inner ring of the bearing is fixedly sleeved on the positioning shaft 134. A rubber sleeve 136 is sleeved on the outside of the roller 135. After completing the preliminary positioning, the roller 135 is released. Under the thrust of the spring, the second slider 132 drives the positioning shaft 134 to reset. The positioning shaft 134 then drives the roller 135. The rubber sleeve 136 on the outside of the roller 135 can fit with the outer edge of the lens to achieve auxiliary positioning of the lens. When the lens is manually rotated one circle and the sensor measures the motion trajectory of the image point after the light beam passes through the lens to analyze the eccentricity, it can prevent the center of the lens and the center of the light hole from shifting, resulting in a large difference in the measurement results.

[0034] When the locating pin 125 is in contact with the outer edge of the lens, the pulling of the locating pin 125 is stopped and the bottom of the locating pin 125 is disengaged from the top of the stage 7, and the locating pin 125 is fixed in the first locating groove 8. By setting the locating pin 125 and the first locating groove 8, the optical center of the lens can be accurately aligned with the measurement reference, which minimizes the error, helps to obtain more accurate eccentricity values ​​during the measurement process, improves the measurement accuracy, and can quickly adjust the position of the locating pin 125. It can adapt to lenses of different sizes and improve the versatility of the equipment. After the initial positioning is completed, the roller 135 is released, and the second slider 132 drives the positioning shaft 134 to reset under the push of the spring. The positioning shaft 134 then drives the roller 135. The rubber sleeve 136 on the outside of the roller 135 can fit with the outer edge of the lens to achieve auxiliary limiting of the lens. When the lens is manually rotated one circle and the sensor measures the motion trajectory of the image point after the light beam passes through the lens to analyze the eccentricity, it can prevent the center of the lens and the center of the light hole from shifting, resulting in a large difference in the measurement results.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tool for measuring lens eccentricity of a transmission-type centering instrument, comprising a base (1), characterized in that: A column (2) is fixedly provided on the top of the base (1), a mounting frame (3) is fixedly provided on one side of the column (2), an upper light beam emitting assembly (4) is provided on the mounting frame (3), a connecting seat (5) is fixedly provided on the top of the base (1), a lower light beam emitting assembly (6) is provided on the top of the connecting seat (5), a chassis (14) is fixedly provided on the top of the lower light beam emitting assembly (6), a mirror stage (7) is fixedly provided on the top of the chassis (14), two first positioning grooves (8) and two second positioning grooves (9) are provided on the mirror stage (7), a positioning structure (12) is provided in each of the two first positioning grooves (8), and a limit assembly (13) is provided in one of the second positioning grooves (9); First limiting grooves (10) are provided on both inner walls of the first positioning groove (8), and second limiting grooves (11) are provided on both inner walls of the second positioning groove (9); The positioning structure (12) comprises a first slider (121) movably connected to the first positioning groove (8); a threaded rod (124) is movably provided on the top of the first slider (121); and a positioning pin (125) is fixedly provided on the top of the threaded rod (124); A first limiting block (122) is fixedly provided on both sides of the first sliding block (121), the first limiting block (122) and the first limiting groove (10) are movably connected, an internal threaded hole (123) is provided on the top of the first sliding block (121), and the threaded rod (124) is adapted to the internal threaded hole (123).

2. The lens eccentricity measurement tool for a transmission-type centering instrument according to claim 1, characterized in that: The mirror stage (7) is provided with four mounting holes in a circular equidistant array, and top screws are movably provided in the mounting holes. The mirror stage (7) and the chassis (14) are fixedly connected via the top screws.

3. The lens eccentricity measurement tool for a transmission-type centering instrument according to claim 1, characterized in that: The limiting assembly (13) includes a slide rod (131) fixedly connected to the second positioning groove (9), a second slider (132) is movably provided on the slide rod (131), second limiting blocks (133) are fixedly provided on both sides of the second slider (132), the second limiting blocks (133) and the second limiting groove (11) are movably connected, a positioning shaft (134) is fixedly provided on the top of the second slider (132), and a roller (135) is movably provided on the top of the positioning shaft (134).

4. The tool for measuring lens eccentricity of a transmission-type centering instrument according to claim 3, characterized in that: The slide bar (131) is provided with a spring, one end of the spring is fixedly connected to one side of the second slide block (132), and the other end of the spring is fixedly connected to one side of the second positioning groove (9). The outer portion of the rotating roller (135) is provided with a rubber sleeve (136).

5. The tool for measuring lens eccentricity of a transmission-type centering instrument according to claim 3, characterized in that: A circular hole is provided at the bottom of the rotating roller (135), a bearing is fixedly provided in the circular hole, and the inner ring of the bearing is fixedly sleeved on the positioning shaft (134).