Heating roller of a fixing device with two internal heaters...

Electrophotography – Image formation – Fixing

Reexamination Certificate

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Details

C219S216000, C399S330000, C399S335000

Reexamination Certificate

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06996363

ABSTRACT:
A heating device for heating a recording sheet. The heating device has a first heater located within a heating roller. The first heater has a heat distribution effective to form a low temperature region in an axially central portion of the heating roller and a high temperature region in each of axially opposite end portions of the heating roller. There is a second heater located within the heating roller that has a heat distribution effective to form a high temperature region in the axially central portion of the heating roller, a low temperature region in each of the opposite end portions of the heating roller, and a second-level high temperature region in each of axially opposite end portions of the high temperature region, the second-level high temperature region being lower in temperature than the high temperature region.

REFERENCES:
patent: 4580033 (1986-04-01), Sakurai
patent: 5512993 (1996-04-01), Endo et al.
patent: 6385410 (2002-05-01), Hanyu et al.
patent: 2003/0190170 (2003-10-01), Hamada et al.
patent: H04-337783 (1992-11-01), None
patent: H06-011998 (1994-01-01), None
patent: H08-123230 (1996-05-01), None
patent: 2001-175120 (2001-06-01), None
patent: 2001154521 (2001-06-01), None
patent: 2001343859 (2001-12-01), None

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