Method for forming video discs

Details Method for forming video discs Method for forming video discs

1982-09-30

1983-12-27

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 38B, C25D 110

Patent

active

044229046

ABSTRACT:
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.times.10.sup.-6 torr, to reduce oxidation and thereby improve conformity between the photoresist geometry and the stamper geometry.

REFERENCES:
patent: 2530842 (1950-11-01), Ruggieri
patent: 4211617 (1980-07-01), Hunyar

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