Optical recording apparatus for recording auxillary signals used

Details Optical recording apparatus for recording auxillary signals used Optical recording apparatus for recording auxillary signals used

1991-08-30

1993-10-12

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4426, 369 4429, 369 54, G11B 700

Patent

active

052532410

ABSTRACT:
An optical recording apparatus for automatically compensating for focus offset which cannot be compensated for with a conventional focus servo circuit. A plurality of auxiliary signals differing from one another in the frequency domain is generated, a rotational synchronism signal is generated by detecting an index mark put on the optical disk in advance to indicate the reference point of the rotational phase, and a switching signal is generated in response to the rotational synchronism signal. In response to the switching signal, a plurality of auxiliary signals and an information signal are consecutively outputted and recorded onto a track of the optical disk.

REFERENCES:
patent: 4476499 (1984-10-01), Kanamaru et al.
patent: 4551771 (1985-11-01), Machida et al.
patent: 4724494 (1988-02-01), Koide
patent: 4766502 (1988-08-01), Mashimo
patent: 5121375 (1992-06-01), Kuribayashi

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