光学仪器中分划板的刻线曾经是采用机械刻线,酸蚀,然后涂黑的办法,到了六十年代改进为真空镀铬的方法,提高了生产效率和某些方面的质量,但是有一个严重的缺点即镀铬的线条有很强的反射光,一般真空镀铬的表面具有55%左右的反射率。这种线条表面的反射光干扰仪器中的正常光路,影响成象质量。近年来国内采用了镀黑铬的办法使线条表面的反 The reticle reticle in optical instruments used to be mechanically retted, etched, and then blacked out to the sixties for a vacuum-chrome-plated method that improved production efficiency and quality in some aspects but had one A serious drawback is the chrome lines have a strong reflection of light, the general vacuum chrome surface with about 55% reflectivity. The reflected light from the surface of this line interferes with the normal light path in the instrument and affects the image quality. In recent years, the domestic use of black chrome plated lines to make the surface of the anti