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:
Dec. 14, 2010
Filed:
Nov. 20, 2007
Applicants:
Kazushi Mori, Hirakata, JP;
Katsutoshi Hibino, Kaizu, JP;
Kenji Asano, Kakamigahara, JP;
Kenji Nagatomi, Kaidu, JP;
Shogo Suzuki, Mizuho, JP;
Naoyuki Takagi, Gifu, JP;
Inventors:
Kazushi Mori, Hirakata, JP;
Katsutoshi Hibino, Kaizu, JP;
Kenji Asano, Kakamigahara, JP;
Kenji Nagatomi, Kaidu, JP;
Shogo Suzuki, Mizuho, JP;
Naoyuki Takagi, Gifu, JP;
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/135 (2006.01);
U.S. Cl.
CPC ...
Abstract
A diffraction element is disposed between a beam branching element (such as a beam splitter) and a photodetector. The diffraction element further segment an interference fringe introduced into stray light by a diffraction grating which divides a laser beam emitted from a laser beam source into a main beam and two sub-beams.