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:
Nov. 26, 1991
Filed:
Sep. 12, 1990
Akihiko Hiroe, Fujisawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A photoelectric conversion device comprises a first voltage source for providing a first predetermined voltage, a photoconductive cell having a first end connected to the first voltage source and a second end, the photoconductive cell being provided so as to receive an optical radiation and having a resistance that is changed in response to the optical radiation supplied to the photoconductive cell, a load resistance having a first end connected to the second end of the photoconductive cell and a second end, a second voltage source connected to the second end of the load resistance for providing thereto a second predetermined voltage that is different from the first predetermined voltage, and threshold detection circuit having an input terminal connected to the second end of the photoconductive cell, wherein the threshold detection circuit has a threshold level and produces a first output signal having a first level when an input signal supplied to the input terminal has a level below the threshold level while producing a second output signal having a second level when the input signal has a level above the threshold level.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile