一、概述虫胶复制镀铬工艺,在国内光学冷加工方面得到广泛应用,特别在小面积分划板及各种光学度盘的复制上,国内各兄弟单位积累了宝贵经验。我所应用于大面积码盘和光栅盘的复制时,碰到了脱膜严重、胶点、脏点很多、针孔密布、脱胶不彻底等问题。本文详细地叙述了码盘、圆光栅盘虫胶复制镀铬的基本原理、工艺、配方、优缺点、经验体会以及目前我们达到的水平。如:复制后度盘精度最高达±0.4秒,复制后圆光栅盘精度最高达±0.3秒,复制后码盘精度最高达±0.2秒,接近母板精度。二、码盘、圆光栅盘虫胶复制、镀铬工艺的基本原理 First, an overview of shellac replication chrome plating process, the domestic optical cold processing has been widely used, especially in the small area reticle and a variety of optical disk copy, the domestic units have accumulated valuable experience. When applied to the copying of large-area code discs and grating discs, I encountered such problems as serious peeling, glue spots, dirty spots, pinholes and incomplete degumming. This paper describes in detail the code disc, round grating disc shellac chrome copy the basic principles, technology, formulation, advantages and disadvantages, experience and the level we have reached. Such as: copy the accuracy of the dial up to ± 0.4 seconds after copying the circular grating disk accuracy of up to ± 0.3 seconds, after copying the encoder accuracy of up to ± 0.2 seconds, close to the motherboard accuracy. Second, the code wheel, circle grating dish shellac copy, chrome plating process basic principles