Optical pickup device

Details Optical pickup device Optical pickup device

2010-04-14

2011-10-11

Haley, Joseph (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, C369S112140, C369S112220, C369S044230, C369S044370

Reexamination Certificate

active

08036090

ABSTRACT:
Provided is an optical pickup device capable of stabilizing a tracking signal and a focusing signal and of preventing quality deterioration of a data signal by eliminating a multi-layer crosstalk. Of reflected lights from a multi-layer disc, a reflected light from a target layer is split into two by a light flux splitting optical system so that the reflected light is spread out toward two directions with respect to a central line, and then the split lights are condensed. In this case, a reflected light from another layer does not reach a condensing position of the reflected light from the target layer, and only the reflected light from the target layer can be detected by a detector. Accordingly, a crosstalk from the another layer is eliminated.

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.
S. Kimura, T. Ide, Y. Anzai, K. Watanabe, T. Shintani, and E. Tatsu, “Use of grating in reading multilayer discs to reduce amount of interlayer crosstalk,” Jpn. J. Appl. Phys. 48, 03A057 (2009).
K. Sano, et al., “Novel One-Beam Tracking Detection Method for Dual-Layer Blu-ray Discs”,The Japan Society of Applied Physics, vol. 45, No. 2B, 2006, pp. 1174-1177.
H. Richter, et al., “System Apsects of Dual-Layer Phase-Change Recording With High Numerical Aperture Optics and Blue Laser”,The Japan Society of Applied Physics, vol. 42, No. 2B, 2003, pp. 956-960.

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