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. 18, 1989
Filed:
Sep. 17, 1987
Applicant:
Inventor:
Masaaki Sawai, Takasaki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 46 ;
Abstract
A semiconductor laser chip having a buried hetero structure comprising a semiconductor substrate and a light emitting portion wherein the active layer and buried layers of the light emitting portion are disposed to be on only a portion of the semiconductor substrate. By virture of this arrangement, the probability of occurrence of V.sub.TH effects can be reduced. Also, the occurrence of the junction short-circuits resulting from an overhanging electrode or from deposition of foreign matter can be reduced.