| 摘要 |
<p>RCA 70,656 FABRICATION OF DIFFRACTIVE SUBTRACTIVE FILTER EMBOSSING MASTER A recording blank, composed of at least one diffraction grating substrate, such as nickel, covered with a layer of photoresist is used to produce an embossing master by exposing the photoresist to picture information composed of respective white and non-white manifesting regions; developing the exposed photoresist to reveal the grating portions underlying solely the white manifesting regions; electroplating and/or etching the revealed portions to flatten and obliterate the revealed grating portions, and then removing the remainder of the photoresist.</p> |
