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:
Jun. 11, 2002
Filed:
Jul. 07, 1998
Kexin Xu, Kyoto, JP;
Keiichi Fukada, Kyoto, JP;
Kyoto Daiichi Kagaku Co., Ltd., Kyoto, JP;
Abstract
An acousto-optic tunable filter including: an acousto-optic crystal ; an acoustic wave driver ; and a piezoelectric transducer , is provided in front of a light source section including a plurality of light sources A, B, . . . N having different wavelength characteristics. The frequency of RF generated by the acoustic wave driver is varied in accordance with a desired wavelength. Thus, the light having the desired wavelength is incident on a converging lens as plus and minus first-order light beams, and the light having wavelengths other than the desired wavelength is incident on a converging lens as a zero-order light beam. The converging lens converges the plus and minus first-order light beams and the zero-order light beams at positions different from each other. A selector having openings located at the positions onto which the plus and first-order light beams are converged is provided in front of the converging lens . Therefore, only the light having the desired wavelength can pass through the selector and is emitted from the light source apparatus