Apparatus for locating a track on disc-like optical information

Details Apparatus for locating a track on disc-like optical information Apparatus for locating a track on disc-like optical information

1981-09-11

1984-11-20

Psitos, Aristotelis M.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 2110

Patent

active

044843194

ABSTRACT:
A track searching system for an optical information recording and reproducing apparatus in which a disc-like information carrier provided with concentric or spiral guide tracks of a channel-like configuration is used as an information recording and storing means and adapted to be scanned by a light beam for recording or retrieval of information. Light flux reflected by the information carrier and presenting variable distribution of light intensity is received by paired photoelectric elements. A difference signal and a sum signal derived from the output signals from the photoelectric elements or a reproduced RF signal representative of reproduced information undergo phase comparison processing, the result of which is utilized for determining the direction and number of guide tracks traversed by the scanning light beam. A desired track is searched and accessed with high accuracy at a high speed for assuring a positive and rapid information recording or retrieval at the desired track regardless of eccentricity of the information carrier, variations in the scanning speed, and the presence or absence of a recorded track.

REFERENCES:
patent: 3962721 (1976-06-01), de Hann
patent: 3963862 (1976-06-01), Bouwhuis
patent: 4006293 (1977-02-01), Bouwhuis et al.
patent: 4051527 (1977-09-01), Braat
patent: 4106058 (1978-08-01), Romeas et al.
patent: 4135086 (1979-01-01), Balg
patent: 4268745 (1981-05-01), Okano
patent: 4305144 (1981-12-01), Ukada
patent: 4363116 (1982-12-01), Kleuters et al.
patent: 4375088 (1983-02-01), de Haan et al.

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