Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
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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Chinese Office Action for corresponding Application No. 200510067656.6, dated Dec. 14, 2007.
Asada Jun-ichi
Kanda Yusuke
Momoo Kazuo
Nishiwaki Seiji
Otani Kenji
Agustin Peter Vincent
Panasonic Corporation
Renner , Otto, Boisselle & Sklar, LLP
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