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:
Nov. 23, 2010
Filed:
Jun. 19, 2007
Tomoya Satoh, Osaka, JP;
Toru Takayama, Nara, JP;
Koichi Hayakawa, Okayama, JP;
Isao Kidoguchi, Hyogo, JP;
Tomoya Satoh, Osaka, JP;
Toru Takayama, Nara, JP;
Koichi Hayakawa, Okayama, JP;
Isao Kidoguchi, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A semiconductor laser devicehaving a ridge stripe structure comprises: an n-type clad layerhaving a protrusion; and an n-type current block layercovering the clad layer, except the upper surface of the protrusion. When the width of the upper surface is W, the distance between front and rear cleavage planes is L, the width of the upper surface at the front cleavage plane is Wf, and the width of the upper surface at the rear cleavage is Wr. In a range where a distance from the front cleavage plane is shorter than or equal to L/2, an area Sc of the upper surface is in a range of L/8×(3Wf+Wr)<Sc≦L/2×Wf, and W in an arbitrary position in the range is in a range of ½(Wf+Wr)<W≦Wf.