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:
May. 25, 1993
Filed:
Nov. 05, 1991
Applicant:
Inventors:
Takeshi Himoto, Osaka, JP;
Ichiro Tonai, Osaka, JP;
Assignee:
Sumitomo Electric Indsutries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2502141 ; 257431 ;
Abstract
A photodiode comprises e.g. an n-type semiconductor layer, a p-type semiconductor region selectively formed in a central part from a surface of the n-type semiconductor layer, a dish-like shaped pn-junction therebetween, an annular electrode formed on the p-type region, an electrode formed on the other side of the n-type semiconductor layer, and a dielectric layer deposited on the n-type semiconductor layer for preventing light from attaining to the semiconductor layer by reflecting a dielectric multilayer consisting of two different media having effective thicknesses equal to one fourth of the wavelength of the light.