Fixing apparatus, image forming apparatus, wire winding...

Details Fixing apparatus, image forming apparatus, wire winding... Fixing apparatus, image forming apparatus, wire winding...

2008-06-03

2008-06-03

Tran, Hoan H (Department: 2852)

Electrophotography

Image formation

Fixing

Reexamination Certificate

active

07383010

ABSTRACT:
A fixing apparatus of the present invention for an electronic induction heating system includes a heat roller and a magnetic excitation coil that generates Joule heat within the heat roller. The fixing apparatus includes a coil positioner that positions the magnetic excitation coil around a portion of a periphery of the heat roller, a fixing roller that fixes toner image on a recording medium, and a belt that contacts a portion of a periphery of the heat roller and the fixing roller to conduct the generated heat from the heat roller to the fixing roller. The coil positioner further has a surface of first curvature substantially identical to a curvature of a periphery of the heat roller at an opposition area, the opposition area being opposite to a contact area where the heat roller makes contact with the belt. The coil positioner is spaced from the belt by a predetermined distance. The coil positioner further has a first extension extending from a first end of the opposition area of the coil positioner and a second extension extending from a second end of the opposition area of the coil positioner. The first extension and the second extension are spaced from the belt distances larger than the predetermined distance.

REFERENCES:
patent: 6872925 (2005-03-01), Asakura et al.
patent: 6888113 (2005-05-01), Monda et al.
patent: 7129448 (2006-10-01), Matsunaga et al.
patent: 2004/0238530 (2004-12-01), Nonaka et al.
patent: 2-220325 (1990-09-01), None
patent: 9-026719 (1997-01-01), None
patent: 2000-243545 (2000-08-01), None
U.S. Appl. No. 11/080,431 to Matsunaga et al.

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