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. 04, 2012
Filed:
Jun. 30, 2011
Kenji Nagatomi, Kaizu, JP;
Shinsei Kasahara, Ota, JP;
Shigeharu Shirane, Kumagaya, JP;
Masayuki Yoshie, Oizumi-Machi, JP;
Kenji Nagatomi, Kaizu, JP;
Shinsei Kasahara, Ota, JP;
Shigeharu Shirane, Kumagaya, JP;
Masayuki Yoshie, Oizumi-Machi, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A spectral element separates first laser light in such a manner that an area including only signal light as reflected first laser light is formed on a photodetector. The photodetector is provided with a first sensor group which is disposed at an irradiation position of signal light of the separated first laser light, and a second sensor group which receives zero-th order diffraction light of a main beam and two sub beams of second laser light that has been transmitted through the spectral element. The second sensor group includes a four-divided sensor which receives the main beam. The four-divided sensor is disposed in an area surrounded by the first sensor group. Zero-th order diffraction light of the first laser light that has been transmitted through the spectral element is irradiated onto the four-divided sensor.