Free hook face prism positioning design and machining method

Abstract

The invention provides a free hook face prism positioning design and machining method so as to solve the problems about high-precision-requirement free hook face machining, detection and adjustment reference consistency control. Based on free hook face prism machining, detection offline detection process repeated positioning and other requirements, a specially-designed auxiliary reference processtable is arranged on a free hook face prism and provided with a positioning reference face, and accordingly machining reference and adjustment reference consistency is achieved. By adoption of the method, uniformity of machining, detecting and even later adjustment reference can be achieved, consistency control of free hook face machining, detecting and adjustment reference is achieved, and the final optical system performance is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of precision processing and high-precision detection of optical components. The invention relates to a positioning processing method of a curved surface prism, in particular to a positioning design and processing method of a free-form surface prism. Background technique [0002] The free-form prism is a special optical element formed by two or more free-form surfaces. Due to the diversity of free-form structure designs, there are a large number of applications in the civilian market, such as F-theta prisms, head-mounted displays, AR, VR, etc. The free-form surface prism can be divided into two types: optical resin and optical glass according to the material. For optical resin, it can be realized by diamond turning or high-precision injection molding technology. However, optical resin materials have poor light transmission and environmental tolerance, so free-form surface prisms of optical glass materials ar...

AI Technical Summary

Problems solved by technology

For ordinary free-form prisms, since the prism itself has no processing and adjustment reference, it needs special tooling to assist in processing and testing, such as "a free-form prism processing method" proposed by patent application number 201610969003.5. This patent adopts high-precision coding The tool realizes the processing requirements of free-form surface prism angle. After adopting this processing method, once the part is removed from the tooling, the original datum will be lost, which will have a great impact on subsequent assembly and adjustment, that is, the repeated positioning datum will be lost, resulting in subsequent assembly. There is some difficulty in tuning

Moreover, the structure adopted in this patent is relatively complicated, and a high-precision encoder is required, which is difficult to be widely used.

Images