Fixing controller and image forming apparatus
US8023841B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2009 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Jan 13, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/2039
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixing controller capable of rapidly detecting an excessive temperature rise, even if an abnormal temperature rise takes place in a state that a rotor of a fixing unit, such as a thin-walled roller or belt, stops rotating. A rotating belt is heated by a coil, a belt temperature is detected by a thermistor, and a drive frequency of a driving circuit for driving the coil is controlled by a control circuit. When the temperature detected by the thermistor becomes equal to or higher than a predetermined temperature, the drive circuit is stopped by an excessive temperature rise detecting circuit. The thermistor is heated such that a difference between the temperatures detected by the thermistor when the belt is rotating and when the belt stops rotating becomes equal to or larger than a predetermined temperature difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.