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:
Oct. 27, 2015
Filed:
Jul. 13, 2011
Hirotaka Kanou, Toyokawa, JP;
Tetsuya Kagawa, Toyokawa, JP;
Hirotaka Kanou, Toyokawa, JP;
Tetsuya Kagawa, Toyokawa, JP;
KONICA MINOLTA BUSINESS TECHNOLOGIES, INC., Chiyoda-Ku, Tokyo, JP;
Abstract
In a fixing device thermally fixing toner images on recording sheets of various sizes, (i) a conductive heat generating rotational body configured to heat toner images, (ii) an excitation coil positioned along a part of an outer circumferential surface of the heat generating rotational body and configured to generate a magnetic flux to heat the heat generating rotational body by electromagnetic induction, and (iii) a demagnetization coil positioned close to the excitation coil so as to cover a part of the excitation coil and configured to cancel, when a toner image is being fixed on a smaller-sized recording sheet, a part of the magnetic flux generated by the excitation coil so that overheating is prevented in a non sheet-passing region, are provided. The demagnetization coil has a thickness smaller than a thickness of the excitation coil in an axis direction of the coils.