Lens radius measuring device based on grating ruler

Through the lens radius measurement device based on the grating scale, combined with the interferometer and grating scale detection combination, the problem of measuring large-diameter lenses is solved by traditional methods, and automated and accurate lens radius measurement is realized. It is suitable for large lenses and avoids lenses damage.

CN222317975UActive Publication Date: 2025-01-07BEIJING INST OF REMOTE SENSING EQUIP
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Patent Information

Application Number
CN202420476275.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-12
Publication Date
2025-01-07
Estimated Expiration
2034-03-12

AI Technical Summary

Technical Problem

It is difficult to effectively measure the radius of large-diameter optical lenses in the prior art. The traditional spherical meter method requires contacting the lenses to easily cause scratches and the measurement range is limited, making it difficult to meet the needs of large-diameter lenses.

Method used

Using a lens radius measurement device based on the grating scale, combined with the interferometer and grating scale detection combination, the lens radius is determined by adjusting the position of the interferometer and grating scale, and using the fringe changes in the interferometer to achieve automated measurement, suitable for large lenses, and through Electric slide rails and precision ball screws achieve precise position adjustment.

Benefits of technology

Accurate measurement of large-diameter lenses is achieved, lens damage is avoided, the measurement range is expanded, suitable for large lenses, and the measurement accuracy is up to 0.01mm.

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Abstract

The utility model provides a lens radius measuring device based on a grating ruler. An interferometer combination comprises an interferometer and a transverse slide rail, and a grating ruler detection combination comprises a grating ruler, a longitudinal slide rail and a lens clamping structure. The grating ruler is arranged on the longitudinal sliding rail, the lens clamping structure is arranged on the longitudinal sliding rail, the interferometer is installed on the transverse sliding rail, the position of the interferometer is adjusted to be focused with a to-be-detected lens, and the position of the grating ruler detection combination is adjusted to enable stripes obtained in the interferometer to change. And determining the radius of the to-be-measured lens based on the change of the stripes. The method can realize automatic lens radius measurement, is suitable for large lenses, and does not cause damage to the lenses during measurement.
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Description

Technical Field

[0001] The utility model relates to the technical field of optical detection, in particular to a lens radius measuring device based on a grating ruler. Background Art

[0002] Optical lenses are the main components of imaging optical systems, and the radius of curvature of spherical optical lenses is one of the important parameters that determine the optical properties of optical lenses. By measuring the radius of the lens, the processing quality of the optical element being measured can be determined. At present, the main method for measuring the radius is the spherometer method, which uses contact measurement and positioning, has good measurement repeatability, and its measurement accuracy can reach within 3μm. However, during the measurement process, the probe needs to contact the optical lens being measured, which is prone to appearance problems such as lens scratches, and the measurement range is small. It can only measure optical lenses with a diameter of less than 70mm, which is difficult to meet the measurement needs of large-diameter lenses.

[0003] Therefore, there is an urgent need for a lens radius measuring device based on a grating ruler. Utility Model Content

[0004] The purpose of the utility model is to provide a lens radius measurement device based on a grating ruler to meet the measurement requirements of large-diameter lenses. The specific technical solution is as follows:

[0005] The utility model provides a lens radius measuring device based on a grating ruler, the device comprising: an interferometer combination and a grating ruler detection combination;

[0006] The interferometer combination includes an interferometer and a transverse slide rail, and the grating scale detection combination includes: a grating scale, a longitudinal slide rail, and a lens clamping structure; the grating scale is arranged on the longitudinal slide rail, the lens holding structure is arranged on the longitudinal slide rail, and the interferometer is installed on the transverse slide rail. The position of the interferometer is adjusted to focus on the lens to be tested, and the position of the grating scale detection combination is adjusted so that the fringes obtained in the interferometer change, and the radius of the lens to be tested is determined based on the change of the fringes.

[0007] In another embodiment of the utility model, the interferometer assembly further comprises: a lifting platform, an interferometer riding bottom plate;

[0008] The interferometer resting base plate is arranged on the transverse slide rail, the lifting platform is arranged on the interferometer resting base plate, and the interferometer is arranged on the lifting platform; the height position of the interferometer is fine-tuned by adjusting the lifting platform.

[0009] In another embodiment of the utility model, two transverse guide rails are provided, each transverse guide rail includes a transverse linear rail and a transverse linear rail slider; each transverse linear guide rail is provided with a plurality of transverse linear guide sliders, and each transverse linear guide slider is fixed on the interferometer supporting base plate.

[0010] In another embodiment of the utility model, the interferometer assembly further comprises a fine-tuning assembly, the fine-tuning assembly is installed between the transverse slide rail and the interferometer riding base plate, the fine-tuning assembly comprises: a precision ball screw, a fixed seat, and a fine-tuning assembly slider;

[0011] The fixed seat is arranged on the slider of the transverse slide rail, the precision ball screw is arranged on the fixed seat, the fine-tuning combination slider is arranged on the precision ball screw, and the fine-tuning combination slider is fixed on the base plate of the interferometer; the horizontal position of the interferometer is fine-tuned by rotating the precision ball screw.

[0012] In another embodiment of the present invention, the adjustment accuracy of the fine-tuning combination is 0.01 mm.

[0013] In another embodiment of the utility model, the grating ruler detection assembly includes: a grating ruler, a lens fixing seat, a bridge type drag chain, and a lens clamp;

[0014] The grating ruler is fixedly mounted on the side of the longitudinal slide rail, the lens fixing seat is fixed on the slider of the longitudinal slide rail, the bridge type drag chain is fixed on the lens fixing seat, and the lens clamp is mounted on the bridge type drag chain.

[0015] In another embodiment of the utility model, one longitudinal slide rail is provided.

[0016] In another embodiment of the present invention, the grating ruler is an electronic grating ruler.

[0017] In another embodiment of the utility model, the grating ruler detection assembly is further provided with a position detection device, and the position detection device is used to measure the position of the lens on the grating ruler.

[0018] In another embodiment of the present invention, the longitudinal slide rail is an electric slide rail, and the movement of the lens can be achieved through motor control.

[0019] The beneficial effects of the utility model are as follows:

[0020] The utility model provides a lens radius measuring device based on a grating ruler, wherein the interferometer combination includes an interferometer and a transverse slide rail, and the grating ruler detection combination includes: a grating ruler, a longitudinal slide rail, and a lens clamping structure; the grating ruler is arranged on the longitudinal slide rail, the lens holding structure is arranged on the longitudinal slide rail, and the interferometer is installed on the transverse slide rail. The position of the interferometer is adjusted to focus on the lens to be measured, and the position of the grating ruler detection combination is adjusted so that the fringes obtained in the interferometer change, and the radius of the lens to be measured is determined based on the change of the fringes. The method can realize automatic lens radius measurement, is suitable for large lenses, and will not cause damage to the lens during measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the structural diagrams of a lens radius measuring device based on a grating ruler;

[0022] Figure 2 This is one of the structural diagrams of a lens radius measuring device based on a grating ruler;

[0023] Figure 3 This is one of the structural diagrams of a lens radius measuring device based on a grating ruler;

[0024] Among them, 1. Interferometer; 2. Lifting platform; 3. Interferometer base plate; 4. Grating scale detection combination; 5. Longitudinal slide rail; 6. Fine-tuning combination. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of this specification clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and their corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this document.

[0026] The following combination Figure 1-3 , describes in detail the technical solutions provided by each embodiment of this specification. Specific embodiment 1:

[0028] The purpose of the utility model is to provide a lens radius measurement device based on a grating ruler to meet the measurement requirements of large-diameter lenses. The specific technical solution is as follows:

[0029] The utility model provides a lens radius measuring device based on a grating ruler, the device comprising: an interferometer combination and a grating ruler detection combination;

[0030] The interferometer combination includes an interferometer and a transverse slide rail, and the grating scale detection combination includes: a grating scale, a longitudinal slide rail, and a lens clamping structure; the grating scale is arranged on the longitudinal slide rail, the lens holding structure is arranged on the longitudinal slide rail, and the interferometer is installed on the transverse slide rail. The position of the interferometer is adjusted to focus on the lens to be tested, and the position of the grating scale detection combination is adjusted so that the fringes obtained in the interferometer change, and the radius of the lens to be tested is determined based on the change of the fringes.

[0031] In another embodiment of the utility model, the interferometer assembly further comprises: a lifting platform, an interferometer riding bottom plate;

[0032] The interferometer resting base plate is arranged on the transverse slide rail, the lifting platform is arranged on the interferometer resting base plate, and the interferometer is arranged on the lifting platform; the height position of the interferometer is fine-tuned by adjusting the lifting platform.

[0033] In another embodiment of the utility model, two transverse guide rails are provided, each transverse guide rail includes a transverse linear rail and a transverse linear rail slider; each transverse linear guide rail is provided with a plurality of transverse linear guide sliders, and each transverse linear guide slider is fixed on the interferometer supporting base plate.

[0034] In another embodiment of the utility model, the interferometer assembly further comprises a fine-tuning assembly, the fine-tuning assembly is installed between the transverse slide rail and the interferometer riding base plate, the fine-tuning assembly comprises: a precision ball screw, a fixed seat, and a fine-tuning assembly slider;

[0035] The fixed seat is arranged on the slider of the transverse slide rail, the precision ball screw is arranged on the fixed seat, the fine-tuning combination slider is arranged on the precision ball screw, and the fine-tuning combination slider is fixed on the base plate of the interferometer; the horizontal position of the interferometer is fine-tuned by rotating the precision ball screw.

[0036] In another embodiment of the present invention, the adjustment accuracy of the fine-tuning combination is 0.01 mm.

[0037] In another embodiment of the utility model, the grating ruler detection assembly includes: a grating ruler, a lens fixing seat, a bridge type drag chain, and a lens clamp;

[0038] The grating ruler is fixedly mounted on the side of the longitudinal slide rail, the lens fixing seat is fixed on the slider of the longitudinal slide rail, the bridge type drag chain is fixed on the lens fixing seat, and the lens clamp is mounted on the bridge type drag chain.

[0039] In another embodiment of the utility model, one longitudinal slide rail is provided.

[0040] In another embodiment of the present invention, the grating ruler is an electronic grating ruler.

[0041] In another embodiment of the utility model, the grating ruler detection assembly is further provided with a position detection device, and the position detection device is used to measure the position of the lens on the grating ruler.

[0042] In another embodiment of the present invention, the longitudinal slide rail is an electric slide rail, and the movement of the lens can be achieved through motor control. Specific embodiment 2:

[0044] The grating ruler detection assembly is placed in front of the interferometer assembly, the lens is installed on the lens clamping mechanism, and the lifting platform and fine-tuning mechanism are adjusted to align the center of the interferometer standard lens with the center of the lens to be measured.

[0045] Slide the optical lens to be measured along the linear guide rail and slider combination 2 and observe the changes in the fringes in the interferometer.

[0046] When cat's eye fringes are observed in the interferometer, the focus of the interferometer standard lens coincides with the center of the radius sphere of the lens being measured, and the grating ruler reading is recorded as 1;

[0047] When black straight lines are observed in the interferometer, the focus of the interferometer standard lens coincides with the vertex position of the measured lens surface, and the grating ruler reading 2 is recorded;

[0048] Lens radius = recorded grating ruler reading 1 - recorded grating ruler reading 2

[0049] The utility model achieves the following significant beneficial effects:

[0050] The implementation is simple, including: building a lens radius measurement device based on a grating ruler; clamping the lens to be measured, adjusting the interferometer to align with the lens; sliding the optical lens to be measured along the guide rail, observing the changes in the fringes in the interferometer; and calculating the lens radius. This solves the problems of the traditional lens contact measurement method, such as easy scratching of the lens and small measurement range.

Claims

1. A lens radius measuring device based on a grating ruler, characterized in that: The device comprises: an interferometer combination and a grating ruler detection combination; The interferometer combination includes an interferometer and a transverse slide rail, and the grating scale detection combination includes: a grating scale, a longitudinal slide rail, and a lens clamping structure; the grating scale is arranged on the longitudinal slide rail, the lens holding structure is arranged on the longitudinal slide rail, and the interferometer is installed on the transverse slide rail. The position of the interferometer is adjusted to focus on the lens to be tested, and the position of the grating scale detection combination is adjusted so that the fringes obtained in the interferometer change, and the radius of the lens to be tested is determined based on the change of the fringes.

2. A lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: The interferometer assembly also includes: a lifting platform and an interferometer base plate; The interferometer resting base plate is arranged on the transverse slide rail, the lifting platform is arranged on the interferometer resting base plate, and the interferometer is arranged on the lifting platform; the height position of the interferometer is fine-tuned by adjusting the lifting platform.

3. A lens radius measuring device based on a grating ruler as claimed in claim 2, characterized in that: There are two transverse slide rails, each of which includes a transverse linear rail and a transverse linear rail slider; each transverse linear guide rail is provided with a plurality of transverse linear guide sliders, and each transverse linear guide slider is fixed on the interferometer base plate.

4. The lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: The interferometer assembly also includes a fine-tuning assembly, which is installed between the transverse slide rail and the interferometer base plate, and includes: a precision ball screw, a fixed seat, and a fine-tuning assembly slider; The fixed seat is arranged on the slider of the transverse slide rail, the precision ball screw is arranged on the fixed seat, the fine-tuning combination slider is arranged on the precision ball screw, and the fine-tuning combination slider is fixed on the interferometer riding base plate; the horizontal position of the interferometer is fine-tuned by rotating the precision ball screw.

5. The lens radius measuring device based on a grating ruler as claimed in claim 4, characterized in that: The adjustment accuracy of the fine-tuning combination is 0.01 mm.

6. The lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: The grating ruler detection combination includes: grating ruler, lens fixing seat, bridge drag chain, lens clamp; The grating ruler is fixedly mounted on the side of the longitudinal slide rail, the lens fixing seat is fixed on the slider of the longitudinal slide rail, the bridge type drag chain is fixed on the lens fixing seat, and the lens clamp is mounted on the bridge type drag chain.

7. The lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: One longitudinal slide rail is provided.

8. The lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: The grating ruler is an electronic grating ruler.

9. The lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: The grating ruler detection assembly is also provided with a position detection device, and the position detection device is used to measure the position of the lens on the grating ruler.

10. The lens radius measuring device based on a grating ruler as claimed in claim 1, characterized in that: The longitudinal slide rail is an electric slide rail, and the movement of the lens can be achieved through motor control.