Apparatus for playing a transparent optically encoded multilayer

Details Apparatus for playing a transparent optically encoded multilayer Apparatus for playing a transparent optically encoded multilayer

1975-02-05

1976-12-21

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003E, 1791003V, H04N 576, G11B 712

Patent

active

039990095

ABSTRACT:
A disc-shaped information carrier is described which contains spirally arranged image and/or sound signals coded in optical form. By recording the information in at least two spiral information tracks which may be separately read the total amount of utilizable information may be increased by a factor equal to the number of information tracks.
An apparatus for reading the information carrier is disclosed which there is inserted in the path of the read beam radiation from a source of radiation to a radiation-sensitive detection system an optical system for selectively converging the read beam on each track, whereby the tracks may be read without turning over the information carrier.

REFERENCES:
patent: 2554679 (1951-05-01), Mitchell
patent: 2950971 (1960-08-01), Lewin
patent: 3518442 (1970-06-01), Johnson
patent: 3848095 (1974-11-01), Wohlmut et al.

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