Electrophotography – Control of electrophotography process – Control of fixing
Reexamination Certificate
2011-06-28
2011-06-28
Chen, Sophia S (Department: 2852)
Electrophotography
Control of electrophotography process
Control of fixing
C219S216000, C399S037000
Reexamination Certificate
active
07970309
ABSTRACT:
The image forming apparatus includes an image forming part, a fixing part including a heater and a temperature detection element; and a power-control part that controls power to be supplied to the heater according to the detection temperature of the temperature detection element, wherein during the power to be supplied to the heater is controlled so as to keep the detection temperature at a control target temperature, if the on-duty ratio selected so to keep the detection temperature at the control target temperature is a specific on-duty ratio and the specific on-duty ratio continues for a predetermined number of cycles, the power-control part switches to another control cycle different in the number of consecutive half-waves of the AC waveform from the control cycle.
REFERENCES:
patent: 6853818 (2005-02-01), Nishida
patent: 2003/0072581 (2003-04-01), Nishida
patent: 2010/0239301 (2010-09-01), Nemoto et al.
patent: 5-281865 (1993-10-01), None
patent: 8-036323 (1996-02-01), None
patent: 2003/123941 (2003-04-01), None
patent: 2008/209604 (2008-09-01), None
Sato Kei
Shimura Yasuhiro
Canon Kabushiki Kaisha
Chen Sophia S
Fitzpatrick ,Cella, Harper & Scinto
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