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. 15, 1994
Filed:
Aug. 07, 1992
Tateki Oka, Atsugi, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
A fixing device of an image forming apparatus for fixing a toner image on a paper by a heating roller and a pressure roller, and having a detector for detecting the temperature of the heating roller. The fixing device controls to supply the electric current to the heating roller intermediately between on state and off state by repeatedly switching on and off the electric current when the difference between the detection temperature signal detected by the detector and a reference temperature signal is within a predetermined value. In detail, the fixing device overlays a periodically changing signal on at least one of the detection temperature signal and the reference temperature signal by a signal convertor so as to control the current supplied to the heating roller in accordance with the comparison result of the detection temperature signal and the reference temperature signal output from the signal convertor.