Electrophotography – Control of electrophotography process – Control of fixing
Reexamination Certificate
2007-12-18
2007-12-18
Chen, Sophia S. (Department: 2852)
Electrophotography
Control of electrophotography process
Control of fixing
C219S216000, C399S088000
Reexamination Certificate
active
11255102
ABSTRACT:
A period of a first edge, a voltage change in a first direction of a first pulse signal fed from a zero-crossing detecting circuit, is detected. A second edge, a voltage change in a second direction opposite to the first direction, is generated when a time period equal to half the period of the first edge has elapsed from the next first edge. In response to a second pulse signal generated from the first and second edges, phase control of power to be supplied to heating elements is performed by using triacs. In this manner, during power control using a signal from the zero-crossing detecting circuit as a trigger signal, is achieved stable power control which enables tracking even though the power supply frequency fluctuates, and which is impervious to the effect of the positive or negative polarity of an input power supply.
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Chihara Hiroshi
Kawazu Takao
Mochizuki Masataka
Takahashi Atsuya
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