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. 03, 1992
Filed:
Mar. 15, 1991
Applicant:
Inventors:
Yoshihiro Miyamoto, Atsugi, JP;
Kunihiro Tanikawa, Tama, JP;
Yuichiro Ito, Atsugi, JP;
Kazuya Kubo, Sagamihara, JP;
Nobuyuki Kajihara, Ebina, JP;
Isao Tofuku, Atsugi, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; G01J / ; H01L / ;
U.S. Cl.
CPC ...
307580 ; 307584 ; 307311 ; 328-2 ; 250332 ; 357 24 ; 377 57 ;
Abstract
A charge injection circuit for injecting a charge to a signal processing circuit has a photo-voltaic element for generating a photocurrent when an infrared light is received, a field effect transistor used for injecting the charge to the signal processing circuit, and an impedance conversion circuit for feeding back an output of the field effect transistor to a substrate potential of the photo-voltaic element. The impedance conversion circuit has a gain which is greater than zero and less than or equal to one.