Master disk for making dies for pressing in particular optical d

Details Master disk for making dies for pressing in particular optical d Master disk for making dies for pressing in particular optical d

1996-04-02

1998-06-23

Vargot, Mathieu D.

Plastic article or earthenware shaping or treating: apparatus

Means forming a mold; or flask, per se

264 133, 264 137, 425810, B29C 3342

Patent

active

057702381

ABSTRACT:
Master disks for providing dies in particular for pressing optical disks, methods of manufacturing same, pressing dies obtained from such master disks and optical disks obtained from the latter and such pressing dies, the master disks consisting of a support carrying at its surface a succession of microcups representative of the information to be duplicated and consisting of a hard, conducting material reflecting in the near infrared range and selected from a zirconium, hafnium or titanium nitride or carbonitride, a hard ceramic reflecting in the near infrared range and conducting at the surface only and a hard glass reflecting in the near infrared range and conducting at the surface only.

REFERENCES:
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patent: 4430401 (1984-02-01), Wilkinson
patent: 4482511 (1984-11-01), Komatsubara
patent: 4610933 (1986-09-01), Van de Leest
patent: 4953385 (1990-09-01), Aoki et al.
patent: 4954065 (1990-09-01), Shindo et al.
patent: 5338178 (1994-08-01), Kato et al.
Patent Abstracts of Japan--vol. 12, No. 361 (P. 763) Sep. 28, 1988.
Patent Abstracts of Japan--vol. 12, No. 144 (P. 697) May 6, 1988.
Patent Abstracts of Japan, JP-A-1 142 077 (Derwent Abstract), Jun., 1989.
Patent Abstracts of Japan, JP-A-2 172 041 (E.P.O. Abstract), Jul. 1990.

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