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:
Apr. 25, 2000
Filed:
Nov. 13, 1998
Applicant:
Inventor:
Zenji Takahashi, Tokyo, JP;
Assignee:
Oki Data Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
399 66 ; 399-9 ; 399 89 ; 399313 ;
Abstract
The transfer voltage supplied to the transfer roller in an electrophotographic printer is determined by feeding current to the transfer roller and reading the voltage produced by passage of the current through the transfer roller. Whether the transfer roller is adequately charged is determined by comparing the voltage reading with a previous voltage reading. The voltage reading is preferably an average reading taken over one revolution of the transfer roller. Alternatively, separate voltage readings are taken for different radial sectors of the transfer roller, and the transfer voltage is determined separately for each radial sector.