Optical recording medium, tilt detector, optical disk drive, til

Details Optical recording medium, tilt detector, optical disk drive, til Optical recording medium, tilt detector, optical disk drive, til

1997-10-10

1999-11-02

Huber, Paul W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

3692754, G11B 700, G11B 370

Patent

active

059783320

ABSTRACT:
A tilt detector and tilt detecting method of detecting a tilt amount by using a tracking error signal, for example, a push-pull signal, obtained from the difference in quantities of light received by a photo detector halved in a direction vertical to the track direction, and correcting an error of tilt amount detected by the imbalance of the light beam on the mirror surface.
An optical recording medium for emphasizing the asymmetricity to the track center of the tracking error signal by changing a spatial frequency in the direction vertical to the track at a specified portion to the spatial frequency in the direction vertical to the track at another portion.
An optical disk drive and tilt correcting method including the steps of calculating an off-track amount which is proportional to a tilt amount detected by a tilt detector, giving the off-track calculated by the off-track calculating means to an optical recording medium by an actuator, and maintaining the center of the light beam intensity at the track center.

REFERENCES:
patent: 5206848 (1993-04-01), Kusano et al.
patent: 5430699 (1995-07-01), Matsubara et al.
patent: 5523989 (1996-06-01), Ishibashi
patent: 5627808 (1997-05-01), Hajjar et al.
patent: 5696756 (1997-12-01), Fujimoto et al.
patent: 5808985 (1998-09-01), Gerber et al.
patent: 5886962 (1999-03-01), Takamine et al.

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