Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1987-02-19
1989-12-26
Epstein, Henry F.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428693, 428694, 428695, 4284255, 428704, 428913, 430945, 522 96, 522103, 522113, 369283, 369284, 369286, 369288, 427 541, B32B 302
Patent
active
048897574
ABSTRACT:
In an optical recording disk wherein a resin layer cured with ultraviolet radiation is provided on a surface of a transparent substrate, the present invention consists in that a material having a heat distortion temperature of at least 65.degree. C. is employed for the ultraviolet-cured resin layer. The appearance of wrinkles on a UV-cured resin surface is suppressed, whereby an optical recording disk of high carrier-to-noise ratio and long lifetime can be provided.
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Horigome Shinkichi
Miwa Hiroaki
Miyamura Yoshinori
Niihara Toshio
Ohta Norio
Epstein Henry F.
Hitachi , Ltd.
Ryan P. J.
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