| 摘要 |
1447066 Optical recording on discs PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 31 Aug 1973 [2 Sept 1972 5 Sept 1972] 41115/73 Heading G5R A disc 1 is successively coated with an etchable layer 2, a metal film 3 and a photoresist 4 and is rotated so that a radiation (e.g. laser) beam modulated according to the information to be recorded scans a circular or spiral track, intermittently exposing the photoresist 4; development, Fig. 2b, followed by etching of the exposed portions of the metal film 3 and layer 2 yields a record, Fig. 2c. This may be used as a stamper or as a master from which stampers are derived. |
