Fixing apparatus and image forming apparatus
US7139495B2 · kind B2 · utility
7Cited by
3References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 23, 2003 |
| Grant date | Nov 21, 2006 |
| Priority date | — |
| Expiry date | Apr 24, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/2006
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
If a temperature of a heat roller 12 rises abnormally, a thermostat 54 operates. When the thermostat 54 operates, a conduction path to an excitation coil 91 of a relay 90 is cut off so that a normally open contact 92 of the relay 90 can be operated. When the normally open contact 92 operates, the supply path of a drive signal supplied from a frequency variable oscillator 81 to a transistor 63 is cut off. By the cut-off, a high-frequency current does not flow through coils 14a to 14c; therefore, induction heating with respect to the heat roller 12 is stopped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.