Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

2008-10-22

2011-10-25

Tran, Thang (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

08045428

ABSTRACT:
An optical pickup apparatus comprising: an objective lens focusing laser light emitted from a laser diode to a signal recording layer of an optical disc; a photodetector including a substantially square light-receiving region made of first to fourth sensors divided by boundaries in a first direction corresponding to a tracking direction and a second direction crossing the first direction, the light-receiving region being irradiated with reflected light of the laser light which is reflected from the signal recording layer thereof; and a half mirror reflecting the laser light in a direction of the objective lens and allowing the reflected light to pass therethrough in a direction of the photodetector, the boundary in the second direction for dividing the first to fourth sensors in the light-receiving region being set according to a shape of a spot of the reflected light directly applied from the half mirror to the light-receiving region.

REFERENCES:
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4709139 (1987-11-01), Nakamura et al.
patent: 4779255 (1988-10-01), Sugiyama et al.
patent: 5420847 (1995-05-01), Maeda et al.
patent: 6222803 (2001-04-01), Uemura et al.
patent: 2003/0165014 (2003-09-01), Fukasawa et al.
patent: 2005/0226106 (2005-10-01), Hwang et al.
patent: 2006/0209647 (2006-09-01), Park et al.
patent: 2007/0147198 (2007-06-01), Nagatomi et al.
patent: 2007/0237039 (2007-10-01), Takeuchi
patent: 8-339556 (1996-12-01), None

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