| 摘要 |
PROBLEM TO BE SOLVED: To provide a heater control device that can light a heater even in the case when, for example, power supply situation is bad and the AC power supply is making a ringing at zero cross, and an image forming device using this device. SOLUTION: As shown in the figure, at the time of the phase control ON, the heater is lighted by using a lighting signal B having a narrow pulse width, and at the time of the phase control OFF, the heater is lighted by using a lighting signal A having a wide pulse width. By doing in this way, even in the case when, for example, the power supply situation is bad, and the AC power supply waveform is making the ringing at near-by zero cross, the heater can be lighted as shown in the figureβ. COPYRIGHT: (C)2005,JPO&NCIPI
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