Image forming apparatus having a fixing device with improved temperature detection features
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United States of America Patent
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Jun 12, 2007
Grant Date -
Jun 30, 2005
app pub date -
Dec 14, 2004
filing date -
Dec 24, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An image forming apparatus includes a fixing device having a pressure roller. The surface of the pressure roller is coated with a PFA resin and has an average surface roughness Ra of 0.05 to 0.13 .mu.m. A thermister is provided to detect the surface temperature of the pressure roller. The thermister includes a metal plate, a resister element attached to the metal plate, and a pair of fluorocarbon-resin films sandwiching the metal plate and the resister element. The fluorocarbon-resin film has a thickness of 15 .mu.m to 80 .mu.m.
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