Automatic gain control apparatus for use in optical disc recordi

Details Automatic gain control apparatus for use in optical disc recordi Automatic gain control apparatus for use in optical disc recordi

1991-12-03

1993-02-23

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

051896540

ABSTRACT:
A power of a light beam incident on an optical disk is increased when data is recorded on the optical disk in comparison with the time when the optical disk is played back. A level of a playback signal from the optical disk is held when an operation mode is switched from a playback mode to a recording mode to maintain a stable tracking servo. Furthermore, a signal produced from a photo sensor receiving a reflected beam from the optical disk is reduced when the optical disk is recorded so that a comparatively narrow dynamic range is required in a tracking servo loop.

REFERENCES:
patent: Re31160 (1983-02-01), Kinjo
patent: 4338682 (1982-07-01), Hosaka et al.
patent: 4482987 (1984-11-01), Okada
patent: 4747089 (1988-05-01), Eguchi et al.
patent: 4807207 (1989-02-01), Konno

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