| 摘要 |
<p>An improved process for making video discs, which enables the molding of replicas having substantially higher signal-to-noise ratios during playback. One aspect of the invention extends the duration of a photoresist development process to yield developed recording masters having spaced information-bearing pits with unexpectedly steeper sidewalls. Another aspect of the invention forms metallic stampers using an initial vapor deposition step carried out in an extremely low pressure of about 1 x 10<-><6> torr, to reduce oxidation and thereby improve conformity between the photoresist geometry and the stamper geometry.</p> |
