Image forming apparatus with induction heating coil unit and...

Details Image forming apparatus with induction heating coil unit and... Image forming apparatus with induction heating coil unit and...

2008-12-29

2010-11-16

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Fixing

C399S330000, C399S334000, C219S619000

Reexamination Certificate

active

07835680

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.

REFERENCES:
patent: 7266336 (2007-09-01), Ueno et al.
patent: 6-318001 (1994-11-01), None
patent: 2003-107941 (2003-04-01), None
patent: 3527442 (2004-05-01), None

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