Electrophotography – Control of electrophotography process – Control of fixing
Reexamination Certificate
2007-02-06
2009-12-15
Gray, David M (Department: 2852)
Electrophotography
Control of electrophotography process
Control of fixing
C347S017000
Reexamination Certificate
active
07634209
ABSTRACT:
A temperature control method for a fixing device, which includes a heating unit that heats a recording material; a temperature detecting unit that detects a temperature of the heating unit; and a temperature controlling unit that determines an amount of power supplied based on a detected temperature of the temperature detecting unit, and controls the temperature of the heating unit by supplying the determined amount of power supplied, wherein temperature is sampled by the temperature detecting unit at a prescribed cycle, and the amount of power supplied is determined on the basis of this detection result, and when the duty cycle of the determined amount of power supplied is no more than 50%, a first period during which power is intermittently supplied to the heating unit, and a second period during which a power supply to the heating unit is not permitted are set within the prescribed cycle.
REFERENCES:
patent: 2002/0061202 (2002-05-01), Kataoka
patent: 2007/0134018 (2007-06-01), Nanba et al.
patent: 3695525 (2005-07-01), None
Gray David M
Hogan & Hartson LLP
Seiko Epson Corporation
Wong Joseph S
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