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:
May. 27, 2008
Filed:
Mar. 07, 2005
Hideki Tatematsu, Ashiya, JP;
Hirofumi Ihara, Fukuoka, JP;
Tadafumi Shimizu, Ogori, JP;
Masahiro Samei, Toyonaka, JP;
Keiichi Matsuzaki, Kurume, JP;
Tomoyuki Noguchi, Kasuga, JP;
Hideki Tatematsu, Ashiya, JP;
Hirofumi Ihara, Fukuoka, JP;
Tadafumi Shimizu, Ogori, JP;
Masahiro Samei, Toyonaka, JP;
Keiichi Matsuzaki, Kurume, JP;
Tomoyuki Noguchi, Kasuga, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An image heating apparatus that enables a temperature of an image heating element to be stably maintained at a target temperature as a fixing speed varies. A Proportional-Integral-Derivative (PID) controller determines whether a temperature control computation results in a range that allows temperature control with one IGBT, and a linear control is performed if the result is at least equal to a minimum power obtained as IH output. PWM control is performed at minimum power if the power is less than a required minimum power. Thus, a computation method of a supply power computator need not be switched according to the fixing speed, and a calorific value of a fixing belt can be controlled using one computation method.