Optical information recording mother disc and method of producin

Details Optical information recording mother disc and method of producin Optical information recording mother disc and method of producin

1981-06-15

1983-10-04

Faber, Alan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369284, 3461351, 346137, 264106, G11B 700

Patent

active

044083190

ABSTRACT:
An optical information recording disc having pits in a first film formed on one of major surfaces of the disc is uniformly covered with a suitable second film, whereby the size of each pits is corrected. When the disc is to be used as a mother disc for production of replicas, at least the wall of each pit is covered by a third layer having continuously increased thickness towards the bottom of the pit so that a peeling off of an intermediate transfer disc from the mother disc is facilitated.

REFERENCES:
patent: 3819315 (1974-06-01), Bouchard
patent: 3842217 (1974-10-01), Clemers
patent: 3882214 (1975-05-01), Nosher
patent: 3894179 (1975-07-01), Jacobs
patent: 4052738 (1977-10-01), Hosomi
patent: 4155098 (1979-05-01), Roach
patent: 4164754 (1979-08-01), Dubois

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