Method and apparatus for tilt correction and optical disk...

Details Method and apparatus for tilt correction and optical disk... Method and apparatus for tilt correction and optical disk...

2007-12-11

2007-12-11

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053190

Reexamination Certificate

active

10767070

ABSTRACT:
In a tilt correction method, first information about a specific inclination of an object lens is acquired in response to an access request to an information recording medium. The specific inclination is obtained when the signal characteristic of a push-pull signal becomes a prescribed level in or near a target access area. Then, second information about the optimum inclination of the object lens is acquired for the target access area, based on the first information and tilt difference information representing a difference between a first inclination and a second inclination of the object lens defined in advance in a particular area on the information recording medium. The first inclination corresponds to an optimum reproduced signal from the particular area, and the second inclination is obtained when the signal characteristic of the push-pull signal from the particular area becomes the prescribed level. Finally, tilt correction information is estimated from the second information.

REFERENCES:
patent: 6459664 (2002-10-01), Yamada et al.
patent: 7196991 (2007-03-01), Nagaoka et al.
patent: 2002/0060964 (2002-05-01), Park
patent: 2003/0179665 (2003-09-01), Iwazawa et al.
patent: 1 213 712 (2002-06-01), None
patent: 2001-52362 (2001-02-01), None
patent: 2002-25090 (2002-01-01), None

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