Apparatus for optically reading a record carrier with two types

Details Apparatus for optically reading a record carrier with two types Apparatus for optically reading a record carrier with two types

1981-10-28

1984-06-19

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369 49, 369109, 369124, 369275, G11B 700

Patent

active

044556322

ABSTRACT:
A record carrier is described which has an optically readable information structure in which information areas of adjacent information track portions have different phase depths, and an apparatus for reading said record carrier. By a suitable choice of the phase depths and by an electronic phase shift of the signals supplied by the read detectors, cross-talk between adjacent tracks can substantially be eliminated.

REFERENCES:
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 3962721 (1976-06-01), de Haan
patent: 4025784 (1977-05-01), Lehureau et al.
patent: 4057833 (1977-11-01), Braat
patent: 4065786 (1977-12-01), Stewart

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