Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2011-01-25
2011-01-25
Chow, Lixi (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112170, C369S112190, C369S112010, C369S112030
Reexamination Certificate
active
07876660
ABSTRACT:
An optical pickup apparatus includes: a first light source for emitting a first light flux; a light-converging optical system including an objective lens and a diffractive structure. When the first light flux from an optical information recording medium enters into the diffractive structure, the diffractive structure emits a main light flux and a secondary light flux. The optical pickup apparatus further includes: a first optical element including a first optical area and a second optical area; a second optical element including a third optical area and a fourth optical area; a light-converging element for converging the main light flux at a position between the first optical element and second optical element; a polarization splitting optical member for splitting the main light flux and the secondary light flux each emitted from the first optical element and second optical element; and a photodetector for receiving the main light flux.
REFERENCES:
patent: 6775221 (2004-08-01), Fukumoto
patent: 7660226 (2010-02-01), Ogata
patent: 2006/0013107 (2006-01-01), Nishiwaki et al.
patent: 2006/0114796 (2006-06-01), Maruyama et al.
patent: 1 304 689 (2003-04-01), None
patent: WO2006093326 (2006-09-01), None
Chow Lixi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Konica Minolta Opto Inc.
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