Optical disk apparatus for detecting wobble signal

Details Optical disk apparatus for detecting wobble signal Optical disk apparatus for detecting wobble signal

2007-04-24

2007-04-24

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047340, C369S059170

Reexamination Certificate

active

10759653

ABSTRACT:
An optical disk apparatus for driving an optical disk having formed therein sawtooth wobbles of +STW and −STW. A pickup receives a laser beam reflected from the optical disk and supplies a reproduced signal to a wobble signal processing section. The wobble signal processing section differentiates the reproduced signal and binarizes the differential signal with reference to a zero level. A pulse length of the binary signal achieved during a positive period is compared with that of the binary signal achieved during a negative period. When the pulse length achieved during the positive period is longer than that achieved during the negative period, the binary signal is determined to be a +STW. In contrast, when the pulse length achieved during the negative period is longer than that achieved during the positive period, the binary signal is determined to be a −STW, whereby a wobble signal is demodulated.

REFERENCES:
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patent: 6680892 (2004-01-01), Mashimo
patent: 2002/0067676 (2002-06-01), Inokuchi et al.
patent: 2003/0185122 (2003-10-01), Akiyama et al.
patent: 2002-324360 (2002-08-01), None

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