Process of producing information recording disc

Details Process of producing information recording disc Process of producing information recording disc

1985-11-04

1987-05-05

Brammer, Jack P.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430641, 430531, 430438, 430568, 428 64, 346 76L, 3461351, 346150, G03C 176

Patent

active

046632670

ABSTRACT:
An information recording disc comprising a generally circular substrate having a polished major surface, a light-reflective coating formed on the polished major surface of the substrate, and a light-absorptive coating formed on the surface of the light-reflective coating and formed with information tracks each consisting of a succession of spaced pits in the light-absorptive coating, the light-absorptive coating being composed of a mixture of cellulose nitrate and a dye sensitizer exhibiting a noticeable light absorptivity in response to light with a predetermined wavelength, the cellulose nitrate being prepared from a starting cellulose containing at least about 97% of alpha-cellulose. If desired, the light-reflective coating may be dispensed with so that the light-absorptive information recording coating is formed directly on the polished surface of the substrate.

REFERENCES:
patent: 3985915 (1976-10-01), Gipstein et al.
patent: 4097895 (1978-06-01), Spong
patent: 4195313 (1980-03-01), Bell et al.
patent: 4230939 (1980-10-01), de Bont et al.
patent: 4412231 (1983-10-01), Namba et al.
patent: 4430401 (1984-02-01), Wickinson

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