Optical disc apparatus including a divided photodetector

Details Optical disc apparatus including a divided photodetector Optical disc apparatus including a divided photodetector

2009-08-07

2011-11-29

Danielsen, Nathan (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S053230, C369S053340

Reexamination Certificate

active

08068393

ABSTRACT:
An optical disc apparatus includes an emitter which emits a laser beam to a optical disc, a divided photodetector including a first dived portion and a second dived portion disposed in a light path of the reflected beam from the optical disc, and producing a first photodetector signal and a second photodetector signal, a phase difference detector which produces a phase difference signal from a phase difference between the first and the second photodetector signals, an integrator which produces a integral signal from a integration of the phase difference signal, a tracking controller configure to perform tracking control based on the integral signal, and a limiter which limits a signal to be supplied from the divided photodetector to the phase difference detector or a signal to be supplied from the phase difference detector to the integrator based on a detection status of a signal detected by the dived photodetector.

REFERENCES:
patent: 6317396 (2001-11-01), Kuribayashi
patent: 2004/0013066 (2004-01-01), Oono et al.
patent: 1 677 292 (2006-07-01), None
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patent: 2005-149704 (2002-06-01), None
patent: 2004-71143 (2004-03-01), None
patent: 2005-182927 (2005-07-01), None

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