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. 24, 2012
Filed:
Jul. 13, 2010
Tetsuya Kagawa, Hoi-gun, JP;
Tetsuya Kagawa, Hoi-gun, JP;
Konica Minolta Business Technologies, Inc., Tokyo, JP;
Abstract
In an image forming apparatus having a fixing rotor () that is driven to rotate and fixes an image by heating a recording paper while conveying the paper pressurized against the rotor, an excitation coil () that is provided extending in an axial direction along the fixing rotor () and causes induction heating by applying an alternating magnetic field to the fixing rotor (), and a demagnetizing coil () that is provided superposed on an end of the excitation coil () and is able to partially diminish a magnetic flux generated by the excitation coil (), by making the shape of the portion that belongs to the demagnetizing coil () and overlaps the excitation coil () has an asymmetrical shape have no axis of symmetry in the direction in which the recording paper is conveyed, a trouble due to overheating and defective fixing due to a shortage in the generation of heat can be reduced even when a plurality of kinds of recording papers of slightly different sizes are used.