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:
Dec. 29, 2015
Filed:
Oct. 19, 2010
Takao Kawazu, Mishima, JP;
Takao Kawazu, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image heating apparatus includes first and second heat generating elements, first and second driving elements provided in a passage from a commercial power source to the heat generating elements, respectively, and a portion controlling the driving elements at a control level depending on a detection temperature. At the control level, a renewing period is two cycles of a waveform of an alternating current of the power source or an integral multiple thereof. The control portion controls, during a period when the control portion controls the driving elements at one control level, the driving elements so that the heat generating element to which the power is to be preferentially supplied is switched from the first to the second driving element and the waveform of the alternating current passing through each of the heat generating elements keeps symmetry of positive and negative half-cycle components with respect to a zero-voltage line.