Method and apparatus for detecting radial tilt

Details Method and apparatus for detecting radial tilt Method and apparatus for detecting radial tilt

2003-07-11

2008-03-25

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320

Reexamination Certificate

active

07349311

ABSTRACT:
A method of, and an apparatus for detecting a radial tilt of a disc. Phases of summed signals obtained from signals that external light-receiving units of an octant photo diode receive are compared to generate an external phase comparison signal Do. Phases of other summed signals obtained from other signals, that internal light-receiving units of the octant photo diode receive, are compared to generate the internal phase comparison signal Di. The radial tilt is detected based on the internal and external phase comparison signals Di and Do obtained when a laser beam crosses a track formed the disc. Thus, the radial tilt can be more precisely detected.

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patent: 6781930 (2004-08-01), Fukumoto
patent: 2002/0041542 (2002-04-01), Sano et al.
patent: 1085509 (2001-03-01), None
patent: 2000 48381 (2000-02-01), None
patent: 2001-110074 (2001-04-01), None

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