Optical disk substrate, optical information-storage medium, and

Details Optical disk substrate, optical information-storage medium, and Optical disk substrate, optical information-storage medium, and

1990-01-17

1991-10-22

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428412, 428913, 369272, 369284, 341 76L, 3411351, 430945, B32B 302

Patent

active

050594613

ABSTRACT:
An optical disk substrate having a foreign-substances index of not more than 1.times.10.sup.5 .mu.m.sup.2 /g, an optical information-storage medium wherein the substrate has an information-recording layer, and a propocess and an apparatus for manufacturing the optical disk substrate.

REFERENCES:
patent: 4701770 (1987-10-01), Ito et al.
patent: 4764331 (1988-08-01), Tokuhara et al.
patent: 4798767 (1989-01-01), Aoki et al.

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