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:
Jan. 09, 1996
Filed:
May. 27, 1994
Applicant:
Inventor:
Kentaro Kuhara, Tokyo, JP;
Assignee:
Seiko Instruments Inc., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
257462 ; 257 53 ; 257452 ; 257436 ; 257444 ; 257448 ; 257451 ; 257459 ; 257464 ; 257640 ; 257648 ; 257652 ;
Abstract
A photo sensor comprises a semiconductor substrate, a bipolar photo transistor having an emitter region, a base region and a collector region which is formed in the surface region of the semiconductor substrate, a silicon dioxide formed on the bipolar phototransistor, and a film having a smaller diffusion coefficient of hydrogen than the silicon dioxide formed all over the silicon dioxide.