Optical disc drive apparatus

Details Optical disc drive apparatus Optical disc drive apparatus

2007-10-15

2010-10-12

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047270, C369S047400

Reexamination Certificate

active

07813231

ABSTRACT:
An optical disc drive apparatus has: a rotation angle counter cleared when the number of pulses in a frequency multiplied FG signal has reached a value corresponding to one rotation of the disc; a switching sector detector detecting polarity switching locations based on the output signal of an RF processor to clear the rotation angle counter; a switching window signal generator generating a switching window signal having a predetermined width based on the count value; a timing signal generator generating a timing signal for each sector based on the output signal of the RF processor; and a polarity switching signal generator generating a polarity switching signal based on the switching window signal and the timing signal.

REFERENCES:
patent: 6333902 (2001-12-01), Shim
patent: 2006/0077828 (2006-04-01), Ogura et al.
patent: 2007/0121443 (2007-05-01), Kawashima et al.
patent: 11-283254 (1999-10-01), None
patent: 2000-215485 (2000-08-01), None

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