Method of manufacturing a die designed to duplicate a video freq

Details Method of manufacturing a die designed to duplicate a video freq Method of manufacturing a die designed to duplicate a video freq

1977-05-06

1979-08-14

Lawrence, Evan K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

96 36, 1791003V, 427 53, 427259, 427264, H04N 586

Patent

active

041647548

ABSTRACT:
A method of manufacturing a metallic die intended for the duplication of a video frequency signal recording. A master impression is engraved in a positive photosensitive resin layer having a thickness on the order of 3000 to 4000 A and covering a metallic substrate, by exposing the layer to a laser beam modulated by the signal which is to be recorded and removing the exposed portions of the layer to bare the underlying substrate. A metal layer substantially equal to the thickness of the initial photosensitive layer is deposited on the non-exposed photosensitive layer and the bared portions of the substrate. Thereafter, the non-exposed photosensitive material and overlying portions of the metal layer are eliminated by a solvent for the non-exposed photosensitive material to form the metal projections of the die.

REFERENCES:
patent: 3463667 (1969-08-01), Chopra
patent: 3567508 (1971-03-01), Cox et al.
patent: 3617373 (1971-11-01), Mott
patent: 3842194 (1974-10-01), Clemens
patent: 3894179 (1975-07-01), Jacobs et al.
patent: 3922774 (1975-12-01), Lindmayer et al.
patent: 4057831 (1977-11-01), Jacobs et al.
An Introduction to Photofabrication using Kodak Photosensitive Resists, Eastman Kodak Company, Publication No. F79, 1967, pp. 7-8.

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