Method for processing free-form surface prism

Abstract

The invention belongs to the technical fields of optical device manufacturing and ultra-precision processing and relates to a method for processing a free-form surface prism. The method comprises the following steps of: calculating an initiating structure according to the structure of the free-form surface prism to be processed, processing the initiating structure by utilizing a precise processing machine tool or a processing center and processing a side face to be processed to be a free-form surface to be a flat face; making a tool holder used for fixing a diamond cutter, wherein by means ofthe tool holder, the diamond cutter can be perpendicular to an end face of a main shaft and can rotate around the main shaft; arranging the diamond cutter and the tool holder on the main shaft of an ultra-precision machine tool and assembling a high-precision rotating table on a Z shaft of the machine tool to build a free-form surface prism ultra-precision processing system; fixing the free-form surface prism on the rotating table and regulating one flat face undergoing the initiating structure processing to be parallel to the end face of the processing main shaft; and designing a processing path. The method provided by the invention has the characteristics of high processing quality, simple structure, low cost and high efficiency.

Description

Technical field [0001] The invention belongs to the technical field of optical device manufacturing and ultra-precision processing, and relates to a processing method of a free-form surface prism. Background technique [0002] The free-form surface prism is the core key component of the light head-mounted display. It can not only greatly reduce the number of system lenses and achieve the purpose of miniaturization and weight reduction, but also can use the excellent optical performance of the free-form surface to further increase the field of view and reduce the requirements for assembly accuracy. The manufacture of free-form prisms has become the key to the miniaturization and practicability of helmet displays. Therefore, research on the manufacturing technology of free-form prisms is of great significance for strengthening my country's national defense and improving military combat capabilities. [0003] At present, the earliest used processing methods for free-form optical devic...

AI Technical Summary

Problems solved by technology

However, the structure of the free-form prism is complex, and three of the five surfaces of the wedge-shaped prism need to be processed by optical free-form surface nano-cutting, which puts forward extremely high requirements for device positioning and clamping. At the same time, the three free-form surfaces Both the positional relationship and the surface shape accuracy put forward high requirements. Therefore, the optical design research on the application of this device has been widely carried out, but there is still no report on successful manufacturing. It is necessary to address the major national defense requirements and processing difficulties of free-form prisms. , a new and practical free-form surface prism processing method is proposed

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