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:
Feb. 01, 2005
Filed:
Dec. 07, 2001
Keisuke Asami, Tokyo, JP;
Keisuke Asami, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
There is provided a wavelength tunable light sourcein which one end surfaceof a semiconductor laseris applied anti-reflection film, a lenscollimates a light beam emitted from the one end surfaceof the semiconductor laseronto which the anti-reflection film is applied, and a wavelength selection portion constituted by a combination of a diffraction gratingand a mirrorselects a light beam having a desired wavelength to return the selected light to the semiconductor laserto make laser oscillation. A center of rotation of the mirroris provided in a position Pwhere mode hopping can be suppressed when the wavelength is tuned and rotation of the mirroris driven by a direct drive system by using a motorhaving a rotation shaftin the center of rotation of the mirror