Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-01-25
2009-11-03
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
C369S044410
Reexamination Certificate
active
07613097
ABSTRACT:
An optical pickup apparatus which carries out recording/reproduction or deletion of information on an optical disc, including a semiconductor laser device in which at least two light sources are integrated, and a hologram optical element which has a plurality of outgoing light areas that divide light reflected from the optical disc, each light being emitted from the semiconductor laser device; the hologram optical element has division lines which divide the outgoing light areas at a position intersecting with each optical axis of the reflected light. The optical pickup apparatus is able to detect a signal corresponding to a light beam divided almost equally in two, even when any one of the plurality of light sources are operating.
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English language Abstract of JP 2002-123971 A.
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Furukawa Daisuke
Kuroda Toshihiro
Nagano Kazumasa
Nakanishi Hideyuki
Agustin Peter Vincent
Greenblum & Bernstein PLC
Panasonic Corporation
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