Image forming apparatus and control method for the same
US8238774B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Apr 6, 2009 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Oct 5, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00481
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus having a fixing device 26 that includes a fixing roller 30, a center coil 33a for induction heating a substantially central part in the axial direction of the fixing roller 30, side coils 33b, 33c for induction-heating end parts in the axial direction of the fixing roller, induction heating power sources 60, 61, 70, 71 which supply a high-frequency pulse voltage to these coils, and a power control circuit 58a which variably controls output power of the induction heating power sources 60, 61, 70, 71 so that the output power increases or decreases stepwise on a predetermined cycle, and has a function of selectively setting maximum power supply and a function of selectively setting the output power variance cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.