The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2009
Filed:
Jan. 25, 2006
Hideyuki Nakanishi, Ohtsu, JP;
Toshihiro Kuroda, Takatsuki, JP;
Kazumasa Nagano, Takatsuki, JP;
Daisuke Furukawa, Takatsuki, JP;
Hideyuki Nakanishi, Ohtsu, JP;
Toshihiro Kuroda, Takatsuki, JP;
Kazumasa Nagano, Takatsuki, JP;
Daisuke Furukawa, Takatsuki, JP;
Panasonic Corporation, Osaka, JP;
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.