Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1991-02-21
1993-04-13
Ryan, Patrick J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428192, 428913, 369277, 369284, 369288, 346 76L, 3461351, 430945, B32B 302
Patent
active
052021718
ABSTRACT:
An optical information recording medium is manufactured by a so-called photopolymerization process. The medium comprises a glass substrate and a layer of ultraviolet ray setting resin having a surface which is a replica of a stamper. Concentric recesses are formed at the outer and inner peripheral edges of the glass substrate to receive an excess resin to avoid any formation of a bur on the finished disk medium.
REFERENCES:
patent: 4802160 (1989-01-01), Yamada
Anezaki Yoshikazu
Sasaki Koji
Eslinger Lewis H.
Krynski W.
Maioli Jay H.
Ryan Patrick J.
Sony Corporation
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