Optical record carrier having position indentifying track modula

Details Optical record carrier having position indentifying track modula Optical record carrier having position indentifying track modula

1987-12-09

1990-03-06

Evans, Arthur G.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369276, H04N 585

Patent

active

049072161

ABSTRACT:
A system for recording and/or reading an information signal (V.sub.i) on an elongated track (4) of an optically readable record carrier (1). A position-identifying signal (V.sub.p) which is synchronous with a clock signal is recorded on the track 4 by modulating the transverse excursion of the track, the signal V.sub.p indicating the instantaneous position along the track at which the information signal V.sub.i is located. The frequency band of the position-identifying signal V.sub.p is situated substantially outside the frequency band of the information signal V.sub.i. In manufacturing such a record carrier, the deflection of a recording beam of radiation in a direction substantially transverse to the track is modulated by the position-information signal V.sub.p.

REFERENCES:
patent: 4736258 (1988-04-01), Noble et al.
Patent Abstracts of Japan, vol. 6, No. 252 (p.-161), (1130) Dec. 1982 57-147139 10 Sep. 82.
Patent Abstracts of Japan vol. 11 No. 230 (p.-599) (267) 28 Jul. 1987 Sony 624339.

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