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:
Apr. 22, 2008
Filed:
Mar. 11, 2005
Susumu Koike, Osaka, JP;
Kenichi Matsuda, Osaka, JP;
Susumu Koike, Osaka, JP;
Kenichi Matsuda, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The dual wavelength semiconductor laser source for an optical pickup includes: two semiconductor laser elements outputting laser beams having oscillating wavelengths different from each other; and a multiplexing waveguide, formed inside of a photonic crystal having a photonic band gap, having one output end outputting laser light at one end surface and two input ends at the other end surfaces. Output beams of the two semiconductor laser elements are coupled to the respective two input ends of the multiplexing waveguide and the two beams are outputted from the one output end of the multiplexing waveguide.