Tilt control for optical disk and tilt control method

Details Tilt control for optical disk and tilt control method Tilt control for optical disk and tilt control method

2007-03-13

2007-03-13

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053190, C369S044370

Reexamination Certificate

active

10361031

ABSTRACT:
At the initialization, a tilt mechanism9is activated in a state where an optical pick-up3is fixed, and set up at a position where an E-F phase difference obtained in a signal processing portion4is 180°. Thereafter, a reproducing operation is started. During the reproducing operation, the tilt mechanism9is not activated and the focus control is made with the focus servo by moving the optical pick-up3up or down, while the level of a focus error signal is within a certain range. Further, if the level of focus error signal is beyond the certain range because the optical disk1is greatly inclined, the tilt mechanism9is activated to cause the optical disk1to come closer to the optical pick-up3to enable the control of the focus servo.

REFERENCES:
patent: 6392967 (2002-05-01), Nakayama et al.
patent: 6594206 (2003-07-01), Katayama
patent: 6625093 (2003-09-01), Hong et al.
patent: 6754146 (2004-06-01), Ma et al.
patent: 6781930 (2004-08-01), Fukumoto
patent: 2000-36125 (2000-02-01), None
patent: 2001-266381 (2001-09-01), None

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