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:
Aug. 19, 2014
Filed:
Dec. 31, 2009
Applicants:
Yoichiro Tarui, Chiyoda-ku, JP;
Atsushi Narazaki, Chiyoda-ku, JP;
Ryoichi Fujii, Chiyoda-ku, JP;
Inventors:
Assignee:
Mitsubishi Electric Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L 29/76 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor device using one or more guard rings includes a p-type guard ring region surrounding a pn junction region, an insulating film covering the p-type guard ring region, one or more conductive films electrically connected with the p-type guard ring region through one or more contact holes made in the insulating film, and a semi-insulating film covering the insulating film and the conductive films. Thus, a desired breakdown voltage characteristic can be ensured even if a foreign matter or the like adheres to a surface of the conductive films.