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:
Sep. 27, 1983
Filed:
Mar. 20, 1981
Applicant:
Inventor:
Toshihisa Hamano, Ebina, JP;
Assignee:
Fuji Xerox Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324457 ; 355 / ;
Abstract
A charge level sensor in which the distance between the sensor and a sample to be sensed is maintained constant and the sensor is entirely protected from strain or contamination by foreign matter and is reduced in size. A rotary drum of aluminum is provided with plural recesses therein in which are disposed charge sensors, preferably MOS FET's. Holes are formed though the substrate leading into the recesses through which pass lead wires coupled to the sensors. The surface of the substrate, including the sensors, is covered by an electric-charge retaining layer such as a photosensitive material or a dielectric material.