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:
Sep. 26, 2006
Filed:
Apr. 15, 2005
Kazushi Mori, Hirakata, JP;
Mitsuaki Matsumoto, Osaka, JP;
Koji Tominaga, Hirakata, JP;
Atsushi Tajiri, Osaka, JP;
Minoru Sawada, Yawata, JP;
Kazushi Mori, Hirakata, JP;
Mitsuaki Matsumoto, Osaka, JP;
Koji Tominaga, Hirakata, JP;
Atsushi Tajiri, Osaka, JP;
Minoru Sawada, Yawata, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
In a holographic pattern provided in a holographic optical element, a patterntwists a diffracted light beam in a clockwise direction, to form a semi-circular light spot Sa on photodetection parts A and B so as to extend over a dividing line LX in a four-segment photodetection part. A patternsimilarly twists the diffracted light beam in a clockwise direction, to form a semi-circular light spot Sb on photodetection parts C and D so as to extend over a dividing line LX in the four-segment photodetection part.