Apparatus and record carrier for optically writing information

Details Apparatus and record carrier for optically writing information Apparatus and record carrier for optically writing information

1984-11-26

1987-10-27

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369109, 369112, G11B 2110

Patent

active

047034084

ABSTRACT:
A record carrier has a circular disc-shaped substrate on which a recording layer capable of optically writing information therein is disposed, and is so constructed that a plurality of circumferential reference tracks extending in a rotating direction are provided at radial intervals, the reference track being put into an optically detectable structure so as to function as an optical guide for recording information between the adjacent reference tracks. A first light beam and a second light beam are condensed by an identical objective lens so as to be respectively focused on the recording layer of the record carrier. As one of the reference tracks is being tracked by the first light beam, the second light beam is diffracted by a light diffracter so as to be spaced from the first light beam on the record carrier by desired track pitches in the radial direction thereof. Thus, data is sequentially recorded at predetermined pitches in a recording area located between the reference tracks by means of the second light beam.

REFERENCES:
patent: 4209793 (1980-06-01), Ueno
patent: 4283777 (1981-08-01), Curry et al.
patent: 4449212 (1984-05-01), Reno
patent: 4462095 (1984-07-01), Chen
patent: 4488277 (1984-12-01), McFarlane et al.
patent: 4504939 (1985-03-01), Eberly
patent: 4507763 (1985-03-01), Kato
patent: 4532522 (1985-07-01), Tsunoda et al.
patent: 4577301 (1986-03-01), Mathews et al.
Translation of 56-41530, PTO #2720.

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