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:
Feb. 22, 2000
Filed:
Apr. 22, 1998
Applicant:
Inventors:
Yuji Okamoto, Kanagawa, JP;
Norio Funahashi, Kanagawa, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257314 ; 257315 ; 257323 ; 257435 ; 257443 ; 257458 ; 257461 ;
Abstract
A semiconductor device includes first and second elements, a light-shielding member, and a comparator. The first and second elements are formed on the same substrate, change in electrical characteristics upon irradiation of ultraviolet rays, and hold the changed states. The first element has the same arrangement as that of the second element. The light-shielding member is formed on the first element to shield ultraviolet rays. The comparator compares the electrical characteristics of the first and second elements and outputs an abnormality detection signal on the basis of the comparison results.