Toner and image forming apparatus
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United States of America Patent
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Nov 23, 2004
Grant Date -
Jan 2, 2003
app pub date -
Apr 2, 2002
filing date -
Apr 3, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A toner having a medium-resistance external additive, and an image forming apparatus which uses the toner. The medium-resistance external additive coating ratio of particles, of which mother particles have equivalent diameters smaller or larger than a diameter of a mother particle diameter, which is equal to the mean particle diameter of the toner, is set to be higher than a virtual reference curve in synchronous distribution of the particle diameters of synchronous medium-resistance external additive particles, relative to the diameters of mother particles. Further, the medium-resistance external additive coating ratios of particles in a range in which mother particles have diameters smaller than d1, and in a range in which mother particles have diameters larger than d2, are set to be higher than a virtual reference curve in synchronous distribution of the particle diameters of synchronous medium-resistance external additive particles relative to the diameters of mother particles.
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