Fixing apparatus with current control to heater

Details Fixing apparatus with current control to heater Fixing apparatus with current control to heater

2008-01-22

2008-01-22

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

C399S070000, C399S328000, C219S486000

Reexamination Certificate

active

07321738

ABSTRACT:
A fixing apparatus has a first heating member and a second heating member provided in a heating portion, and a current control unit which controls an AC current to be supplied to the heating portion, The current control unit executes a wave number control, on the AC current supplied to the heating portion, in a unit of predetermined number of half-waves so that an AC current to the first heating member is supplied in a positive-negative symmetrical pattern in the unit of predetermined number of half-waves; an AC current to the second heating member is supplied in a positive-negative symmetrical pattern in the unit of predetermined number of half waves; AC currents to the first and second heating members are supplied in a positive-negative symmetrical pattern in total in the unit of predetermined number of half-waves and the current control unit increases the duty ratio alternately for the first heating member and the second heating member.

REFERENCES:
patent: 5486903 (1996-01-01), Kanno et al.
patent: 5669039 (1997-09-01), Ohtsuka et al.
patent: 5994671 (1999-11-01), Suzuki et al.
patent: 6385406 (2002-05-01), Funamizu et al.
patent: 6519426 (2003-02-01), Goto et al.
patent: 6701117 (2004-03-01), Kaji
patent: 2006/0051118 (2006-03-01), Kaji et al.
patent: 9-258598 (1997-10-01), None
patent: 2004-138839 (2004-05-01), None
patent: WO 2005064419 (2005-07-01), None

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