Optical disc recording and retrieval system

Details Optical disc recording and retrieval system Optical disc recording and retrieval system

1981-04-15

1984-02-21

Konick, Bernard

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369111, 369124, G11B 2722, G11B 2730

Patent

active

044334036

ABSTRACT:
An optical signal recording and reproduction or retrieval system which records a primary signal on a recording track provided on a recording medium by projecting a laser beam which has been modulated by the primary signal onto the recording track, and further records a secondary signal, by superposition, on the recording track by projecting the laser beam which has been modulated by the secondary signal having a frequency band which is different from that of the primary signal onto the recording track for enabling the deleting of the previously recorded primary signal.

REFERENCES:
patent: 3657707 (1972-04-01), McFarland et al.
patent: 4145758 (1979-03-01), Drexler et al.
patent: 4313191 (1982-01-01), Winslow et al.
patent: 4327430 (1982-04-01), Wada et al.
patent: 4340907 (1982-07-01), Hirata et al.

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