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:
Jul. 27, 1993
Filed:
Jul. 26, 1991
Youichi Nagatake, Tokyo, JP;
Kouichi Matsumoto, Tokyo, JP;
Kazuo Yamamoto, Tokyo, JP;
Koichi Kitamura, Tokyo, JP;
Nippon Steel Corporation, , JP;
Abstract
An image sensor apparatus includes a matrix array of optical/electrical conversion elements, switching elements for taking out electric charge stored on the conversion elements, and drive circuits for driving the switching elements thereby to take out image signals from the conversion elements in parallel. A matrix array of noise signal retaining circuits is provided on output sides of the conversion elements for temporarily retaining in parallel, as noise signals, signals produced while the optical/electrical conversion elements are not being driven. Subtracting circuits are provided for subtracting from the parallel image signals in parallel the noise signals retained in the noise signal retaining circuits. A multiplexer converts the parallel output signals from the subtracting circuits into a serial signal in a predetermined sequence. Thus, the image sensor apparatus temporarily retains in parallel the parallel noise signals produced as a result of fluctuations in the characteristics of circuit elements, and cancels out with the subtracting circuits substantially the same noise which is contained in the image signals output from the conversion elements.