Optical pickup device and optical disc apparatus

Details Optical pickup device and optical disc apparatus Optical pickup device and optical disc apparatus

2009-04-02

2011-10-18

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

08040780

ABSTRACT:
In the optical pickup device, while reflection light reflected from the optical multi-layer disc is divided into a plurality of regions so as to produce a plurality of divided optical beams, the divided optical beams are focused onto different positions on a photodetector, and a focus error signal is detected by employing a plurality of the divided optical beams by utilizing the knife edge method, and further, a tracking error signal is detected by employing a plurality of the divided optical beams. Furthermore, the dividing regions of the optical beam and light receiving parts are arranged in such a manner that stray light derived from other layers of the optical disc is not entered to a servo signal-purpose light receiving part of the photodetector when the divided optical beam is focused onto a target layer of the optical disc.

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Sano et al., “Novel One-Beam Tracking Detection Method for Dual-layer Blu-Ray Discs”, CPM2005-149 issued by The Institute of Electronics, Information and Communication Engineers, (Oct. 2005, p. 33, figures 4 and 5).

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