Device and method for controlling tilt servo

Details Device and method for controlling tilt servo Device and method for controlling tilt servo

2005-08-02

2005-08-02

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053190

Reexamination Certificate

active

06925039

ABSTRACT:
A tilt servo control device of an apparatus for recording information on and reproducing information from an optical recording medium, the apparatus comprising an optical system for leading a laser beam emitted from a light source to a recording surface of the optical recording medium and a laser beam reflected by the recording surface of the recording medium to a split type photo detector and a read signal generator for generating a read signal in accordance with an output signal of the photo detector. The tilt servo control device generates a push-pull component signal including a differential component of output signals of respective split portions of the photo detector, generates a tilt error signal representing a tilt angle at a position of the laser beam irradiating the recording surface and an optical axis of the laser beam based on the push-pull component signal, and drives a tilt angle adjuster for adjusting the tilt angle so as to reduce the tilt error signal.

REFERENCES:
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patent: 5523989 (1996-06-01), Ishibashi
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patent: 6141304 (2000-10-01), Ogasawara
patent: 6418104 (2002-07-01), Sato et al.
patent: 6594206 (2003-07-01), Katayama
patent: 6707773 (2004-03-01), Katayama
patent: 0 468 613 (1992-01-01), None
patent: 2000-149298 (2000-05-01), None
Japanese Abstract No. 9 212891, dated Dec. 25, 1997.

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