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Milling and Grinding Method of Large Aperture Off-axis Aspheric Lenses

An off-axis aspheric surface and processing method technology, which is applied in the field of milling and grinding of large-caliber off-axis aspheric lenses, can solve the problems of difficult to achieve high surface shape accuracy, small amount of one-time feed, easy to introduce errors, etc. Achieve the effect of shortening the milling and grinding cycle, improving efficiency and reducing the amount of processing

Active Publication Date: 2018-05-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, it has been proposed to directly mill the blank according to the designed off-axis aspheric surface, and place the off-axis aspheric optical element to be processed directly in the center of the machine tool turntable for processing. This method is suitable for off-axis aspheric surfaces with large diameter and high For lens milling and grinding, the stability is poor, it is easy to introduce errors, it is difficult to achieve high surface accuracy, and the amount of feed is small at one time, and the processing cycle is long

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  • Milling and Grinding Method of Large Aperture Off-axis Aspheric Lenses
  • Milling and Grinding Method of Large Aperture Off-axis Aspheric Lenses
  • Milling and Grinding Method of Large Aperture Off-axis Aspheric Lenses

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the scope of the present invention should not be limited thereto. The concrete steps of this embodiment are:

[0023] 1. Calculate the closest fitting spherical radius of the off-axis aspheric lens to be processed, and find the angle θ required for the off-axis aspheric lens to be processed to be placed in the center of the machine tool turntable

[0024] The aspherical equation expression used in the calculation is:

[0025]

[0026] Among them, s 2 =x 2 +y 2 , c is the curvature, c=1 / R (R is the curvature radius of the vertex), k is the quadratic surface constant, A 2 ~A 4 is the higher order coefficient. According to the above-mentioned aspheric surface equation and parameters, and the outline size of the off-axis aspheric lens (the outline of the off-axis aspheric lens is a square in this example, L×L), the off-axis amount D and ...

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Abstract

The invention provides a milling and grinding method of a large-caliber off-axis aspherical lens. By designing a clamp device with an angle and putting the to-be-machined off-axis aspherical lens at the center of a machine tool rotating table in the manner that the to-be-machined off-axis aspherical lens inclines by a certain angle in the meridian direction of the off-axis aspherical lens, the rise change rate of the to-be-machined off-axis aspherical lens is decreased, and milling, grinding and coping forming continues to be conducted according to designed parameters of the off-axis aspherical lens on the basis that a blank of the to-be-machined off-axis aspherical lens is milled and ground to be the closest to a fitting spherical surface. By means of the method, the machining amount of the subsequent grinding stage is decreased, the machining stability and precision are improved, the milling and grinding period is shortened, and the machining efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of optical processing in large-scale high-power laser devices, in particular to a milling processing method for large-diameter off-axis aspheric lenses. Background technique [0002] Large-aperture off-axis aspheric lenses are mainly used in large-scale high-power laser devices, large astronomical telescopes, interferometers, etc., which have high requirements for surface shape accuracy and surface roughness. As a part of the full-aperture aspheric surface, the off-axis aspheric surface is an off-axis non-rotationally symmetrical optical element. Due to its complex curved surface and high precision requirements, it is difficult to process. It is more difficult to process the large-diameter Oyago off-axis aspheric. [0003] At present, the processing of off-axis aspheric lenses mainly includes four stages: blank manufacturing, milling, grinding and polishing. In the milling and grinding process, the early m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B13/02B24B13/005B24B41/02
CPCB24B13/0055B24B13/02B24B41/02
Inventor 魏朝阳赵璇邵建达张彦超胡晨
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI