Preformatted optical recording card and method of producing the

Details Preformatted optical recording card and method of producing the Preformatted optical recording card and method of producing the

1987-01-16

1989-10-31

Dees, Jose G.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430321, 430322, 430323, 430324, 430495, 428201, 428203, 428913, 3461351, 369272, 369275, 369277, 369283, 369284, 369286, G03C 300, G11B 700

Patent

active

048777137

ABSTRACT:
An improved art of producing an optical recording medium by utilizing a photo-etching technique is disclosed. Pits pattern of address for guide groove and sector on each of tracks of optical recording medium to be preformatted is formed in accordance with a photo-etching process or a resist lift-off process. A film of optical recording medium is formed on a transparent base plate and it is then subjected to photo-etching process or alternatively to resist lift-off process to form preformatted pits pattern.

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patent: 4778747 (1988-10-01), Ohta et al.

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