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:
Mar. 30, 1999
Filed:
May. 30, 1997
Applicant:
Inventors:
Kenichi Imamura, Kawasaki, JP;
Naoki Yokoyama, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257184 ; 257187 ; 257462 ; 257466 ; 257197 ; 257198 ;
Abstract
A photodetection device includes a collector layer, a collector electrode connected electrically to the collector layer, a base layer free from a junction region for contacting with an electrode, an emitter layer including at least two, mutually separated emitter regions; and at least two emitter electrodes provided respectively on the emitter regions, wherein the base layer is exposed optically to an external optical radiation.