Optical pickup device

Details Optical pickup device Optical pickup device

2011-06-21

2011-06-21

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S112160, C369S112220, C369S044230, C369S044250

Reexamination Certificate

active

07965610

ABSTRACT:
In an optical pickup capable of removing inter-layer crosstalk, a dark line that may appear in a central portion of a beam is removed. Thereby, an error in a data signal is reduced. Reflected light from a multi-layer disc is split into two parallel bundles with a splitting optical system in a way that the light is split at a central line. Thereby, when reflected light from a target layer is focused, the reflected light is not influenced from an attenuation element provided on an optical axis.

REFERENCES:
patent: 2007/0104072 (2007-05-01), Ogata
patent: 2007/0268807 (2007-11-01), Kimura et al.
patent: 2008/0127238 (2008-05-01), Kimura et al.
patent: 2008/0267019 (2008-10-01), Kimura et al.
patent: 2009/0016180 (2009-01-01), Kimura et al.
patent: 2009/0103106 (2009-04-01), Kimura et al.
patent: 2002367211 (2002-12-01), None
patent: 2005302084 (2005-10-01), None
Hartmut Richter et al.; System Aspects of Dual-Layer Phase-Change Recording with High Numerical Aperture Optics and Blue Laser; Japan Journal Applied Physics; Feb. 2003; pp. 956-960; vol. 42, Part 1, No. 2B.
Shigeharu Kimura et al.; Use of grating in reading multi-layer disc to reduce amount of interlayer cross-talk; ISOM/ODS, Technical Digest Post-deadline Papers, TD05-155; 2008; pp. 1-3; central Research Laboratory, Hitachi, Ltd. 1-280, Higashi-koigakubo, Kokubunji 185-8601, Japan.

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