| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a fixing device using an electromagnetic induction heat system, which restricts fluctuations in temperature ripples on a fixing roller and stably controlling the temperature of the fixing roller during a standby period without sheet passing operation to maintain a predetermined temperature while heating and rotating the fixing roller, and to provide an image forming apparatus provided with the fixing device. <P>SOLUTION: The fixing device includes: a fixing sleeve having a heating layer; a pressure roller to form a nip while contacting the fixing sleeve and to be driven to rotate the fixing sleeve; a temperature sensor to detect a temperature of the fixing sleeve; and an excitation coil provided near the fixing sleeve and configured to perform induction heating of the heating layer based on the detection result from the temperature detector. The fixing device changes a rotational speed of the fixing sleeve (S104), in a standby time during which the fixing sleeve, while rotating, is controlled to be heated so as to maintain a target temperature (S102), when a periodic temperature difference with a fluctuation amplitude larger than a predetermined value compared to the target temperature occurs on a circumference of the fixing rotary member (S103). <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
