Image heating apparatus
US7379685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2005 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | May 5, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/2045
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.