Developer in an image forming device having a binding resin and magnetic powder
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United States of America Patent
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May 7, 1991
Issued Date -
N/A
app pub date -
May 25, 1990
filing date -
Oct 26, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A developer for developing electrostatic images, containing a magnetic toner having a binder resin and magnetic powder, the developer containing 17-60% by number of magnetic toner particles of 5 microns or smaller, containing 1-23% by number of magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of magnetic toner particles of 16 microns or larger; wherein the magnetic toner has a volume-average particle size of 4-9 microns, and the magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following: N/V=-0.04N+k, wherein N denotes % by number of magnetic toner particles of 5 micron or smaller, V denotes % by volume of magnetic toner particles of 5 microns or smaller, k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
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