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:
Jul. 25, 1995
Filed:
Aug. 12, 1993
Applicant:
Inventors:
Assignee:
Goldstar Co., Ltd., Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257 13 ; 257 94 ; 257 96 ; 257 97 ; 257183 ;
Abstract
A semiconductor laser diode of a double hetero structure including a semiconductor substrate, a buffer layer, a clad layer of a first conductivity type, an active layer and a clad layer of a second conductivity type, all layers being sequentially formed over the substrate, characterized by an intermediate layer interposed at at least one of a region between the substrate and the first clad layer and a region between the second clad layer and the cap layer, the intermediate layer being adapted to reduce a series resistance component and thus make a flow of current smooth.