Optical recording apparatus for recording auxiliary signals used

Details Optical recording apparatus for recording auxiliary signals used Optical recording apparatus for recording auxiliary signals used

1993-05-04

1995-07-11

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 50, 369 54, G11B 7095

Patent

active

054327652

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: 4907212 (1990-03-01), Pharris et al.
patent: 5164932 (1992-11-01), Fennema et al.
patent: 5251194 (1993-10-01), Yoshimoto et al.

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