Phase controlling device, fuser controlling device having...

Details Phase controlling device, fuser controlling device having... Phase controlling device, fuser controlling device having...

2007-03-23

2009-06-02

Brase, Sandra L (Department: 2852)

Electrophotography

Control of electrophotography process

Control of fixing

Reexamination Certificate

active

07542693

ABSTRACT:
A phase controlling device of reduced cost, a fuser controlling device including the phase controlling device, and a phase controlling method. The phase controlling device includes: a first signal generating unit generating an error signal that corresponds to a difference between the reference temperature of the fuser and the actual temperature of the fuser; a pulse generating unit generating a sawtooth wave pulse signal that increases with time during a half period of the AC power; and a control signal generating unit comparing the error signal and the sawtooth wave pulse signal and outputting a phase control signal controlling phase of the AC power. The pulse generating unit generating an increasing sawtooth wave pulse may have a relatively simple circuit configuration relative to that of the pulse generating unit generating a decreasing sawtooth wave pulse, thereby reducing manufacturing costs.

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patent: 2006/0140691 (2006-06-01), Kim et al.
patent: 4-318586 (1992-11-01), None
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patent: 2002-171750 (2002-06-01), None
Extended European Search Report issued Nov. 20, 2007 from the European Patent Office with respect to European Patent Application No. 07107745.7 filed on May 8, 2007.

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