Device for optical recording and read-out of data along a prerec

Details Device for optical recording and read-out of data along a prerec Device for optical recording and read-out of data along a prerec

1982-07-06

1985-04-23

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369111, 369277, 369275, G11B 700, G11B 2110

Patent

active

045134073

ABSTRACT:
The invention relates to optical devices enabling writing and reading of data on a disc comprising a preformed pattern, the recording and reading operations utilizing a lighting spot able to illuminate only a single track element at a time. The invention provides a preformed pattern such that the spot overlaps on the track elements bordering a track interstice and vice versa, in such manner as to obtain a preformed contrast which can be accentuated by recording the data. The invention is applicable in particular to the recording of video frequency signals and to storing digital data on a disc.

REFERENCES:
patent: 3171744 (1965-03-01), Peticolas
patent: 3314073 (1967-04-01), Becker
patent: 3644014 (1972-02-01), Hirschberg
patent: 3913076 (1975-10-01), Lehureau
patent: 3983317 (1976-09-01), Glorioso
patent: 4032691 (1977-06-01), Kido
patent: 4176377 (1979-11-01), Howe
patent: 4313188 (1982-01-01), Bartolini
Patent Abstracts of Japan, vol. 5, No. 88 (p. 65) Jun. 9, 1981.

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