Optical disk apparatus with a wavelength plate having a...

Details Optical disk apparatus with a wavelength plate having a... Optical disk apparatus with a wavelength plate having a...

2005-04-22

2008-12-09

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

C369S112100

Reexamination Certificate

active

07463569

ABSTRACT:
It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly perform optical disk controls. The optical disk apparatus includes: a light source for emitting light; an objective lens for converging the light onto a signal surface of an optical disk; a polarized beam diffraction element for diffracting the light reflected from the optical disk; a photodetector for detecting the light diffracted from the polarized beam diffraction element; and a wavelength plate disposed between the optical disk and the polarized beam diffraction element. The wavelength plate has a two-dimensional array of a plurality of birefringent regions including first and second regions, the first and second regions differing in birefringent phase difference and/or optic axes from each other, and the plurality of birefringent regions including the first and second regions cause the light to have different polarization states.

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patent: 7099085 (2006-08-01), Yamada et al.
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patent: 06-131674 (1994-05-01), None
patent: 2000-132848 (2000-12-01), None
Chinese Office Action for corresponding Application No. 200510067656.6, dated Dec. 14, 2007.

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