Developing device and image forming apparatus
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United States of America Patent
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May 3, 2011
Grant Date -
Mar 26, 2009
app pub date -
Sep 22, 2008
filing date -
Sep 25, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A developing device includes a rotator that rotates around a shaft, and a bearing element that supports the shaft to a housing. A sliding element formed of a composite material that contains self-lubricating thermoplastic olefin resin as a base material is used as the bearing element. The sliding element formed of the composite material has at least a ratio of numerical values of “Rockwell hardness”/“bending elastic modulus” in a range from 25 to 45, and provides a sliding surface of which a frictional coefficient is lower than that of the sliding element formed of the base material.
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