Title:
【発明の名称】光ディスク再生装置のチルトサーボ回路
Document Type and Number:
Japanese Patent JP2605776
Kind Code:
B2
Abstract:
A tilt servo circuit for controlling an optical axis of an optical pickup perpendicularly to the surface of an optical disc such as a Laser Vision Disc or a Compact Disc playbed back by an optical disc playback device comprises a RF level detection circuit for detecting level of an RF reproduced signal from an optical pickup, a tilt changing circuit for changing a tilt angle of the optical pickup, and a tilt servo control circuit for controlling the tilt changing circuit so as to bring the RF level to maximum or substantially maximum. The level of the RF reproduced signal varies with inclination of laser beam with respect to the perpendicular direction to the disc surface, namely the RF level is at the maximum when the inclination is zero and it decreases as the inclination increases. By detecting the RF level and controlling the tilt changing circuit in a manner to bring the RF level to the maximum, the inclination of the optical axis of the laser beam can be corrected.
Inventors:
Shingo Kamiya
Hiroyoshi Takanashi
Hiroyoshi Takanashi
Application Number:
JP2359288A
Publication Date:
April 30, 1997
Filing Date:
February 03, 1988
Export Citation:
Assignee:
Yamaha Corporation
International Classes:
G11B7/095; G11B7/09; (IPC1-7): G11B7/09
Domestic Patent References:
| JP5942648A | ||||
| JP6379239A | ||||
| JP6313127A | ||||
| JP6299924A |
Attorney, Agent or Firm:
Kunihiko Kato