Recorded disk reproducing system

Details Recorded disk reproducing system Recorded disk reproducing system

1979-08-24

1981-04-28

Welsh, Maurice J.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

430 23, 430231, 430396, B29D 1700

Patent

active

042645514

ABSTRACT:
A recorded disk preproducing system in which a signal pattern recorded on a master disk is transferred to a reproducing disk positioned in close contact with the master disk upon exposure to flashing light. The master disk includes a thin film of a light screening material such as in organic compound, chalcogen compound, or the like formed on a transparent glass substrate, and an information signal is recorded on the thin film as a pattern of varied light transmission. The reproducing disk has a thin film of a heat sensitive material such as amorphous chalcogen compound formed on a transparent resin substrate, and the optical density and/or a light reflectance of the heat sensitive thin film is varied in accordance with the recorded signal pattern of the master disk upon exposure to the flashing light.

REFERENCES:
patent: 3253918 (1966-05-01), Condax
patent: 3642477 (1972-02-01), Trusheim et al.
patent: 3701659 (1972-10-01), Doo et al.
patent: 3860382 (1975-01-01), Spiller et al.
patent: 4032610 (1977-06-01), Spiller et al.
patent: 4108660 (1978-08-01), Gale et al.

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