Apparatus for reproducing information from an optically readable

Details Apparatus for reproducing information from an optically readable Apparatus for reproducing information from an optically readable

1984-01-13

1986-04-15

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 700

Patent

active

045832099

ABSTRACT:
An apparatus is described for reading an optically readable record carrier in which a light beam which has been modulated by the record carrier is incident on a detector divided into four quadrants. A tracking-error signal is obtained by measuring the time intervals between corresponding zero crossings of a first signal supplied by two diagonally situated sub-detectors of said detector and a second signal supplied by the two other diagonally situated sub-detectors and/or all four sub-detectors.

REFERENCES:
patent: 4051527 (1977-09-01), Braat
patent: 4057833 (1977-11-01), Braat
patent: 4408314 (1983-10-01), Yokota
patent: 4467462 (1984-08-01), Shibata
patent: 4497048 (1985-01-01), Kimura

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