Optical disc drive apparatus

Details Optical disc drive apparatus Optical disc drive apparatus

2007-01-31

2009-12-29

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112190

Reexamination Certificate

active

07639588

ABSTRACT:
The amount of reflected light from an adjacent layer in a multilayer optical disc is reduced by means of a combination of half-wave plates having different optical axes and a flat mirror. The polarization direction of the reflected light from a target layer is changed without changing the polarization direction of reflected light from the adjacent layer so as to detect a signal from the target layer alone. Because no stray light is introduced into the tracking error signal or focus signal, the laser light irradiated position can be controlled with high accuracy. This makes it possible to accurately determine the laser irradiated position during reading and writing, thereby enhancing signal quality. Because no reflected light from the adjacent layer is introduced into the data signal, a data signal with reduced error can be obtained.

REFERENCES:
patent: 5790501 (1998-08-01), Kase et al.
patent: 2001-174983 (2002-12-01), None
patent: 2002-367211 (2002-12-01), None
patent: 2005-302084 (2005-10-01), None
N. Shida, et al., “Superlarge-Capacity Optical Disk with Multilayer Structure Fabricated Using a Photopolymer Sheet”, Jpn. J. Appl. Phys., vol. 42, pp. 778-783, Feb. 2003.
T. Ogata, “Multi-Layer Disk Read-Out Technology Used Photonic Crystal”, Optics Japan, 2005.
T. Ogata, et al., “Novel Read-Out Technology for Multi-Layer Disk Using Polarization Device”, IEEE, pp. 31-33, 2006.

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