Image forming apparatus with induction heating coil unit and a magnetism adjusting member with a closed frame shape
US7835680B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2008 |
| Grant date | Nov 16, 2010 |
| Priority date | — |
| Expiry date | Feb 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/2032
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixing unit (14) of an image forming apparatus (1) includes a heating member (48) having a first area where a sheet does not come into contact with the heating member (48) and a second area where the sheet comes into contact with the heating member (48). The fixing unit (14) further includes a coil (52) forming a magnetic field, cores (54,56) forming a magnetic path near the coil (52), a nonmagnetic magnetism adjusting member (90) arranged on the magnetic path and having a closed frame, and a switcher (58,60) capable of switching the magnetism adjusting member (90) between a first state where the magnetism adjusting member (90) generates an induction current resulting from the magnetic field to shield the magnetism in the first area, and a second state where the magnetism adjusting member (90) generates no induction current and the magnetism is not shielded in the first area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.