Ferrite particles and electrophotographic development carrier using same, electrophotographic developer and method of manufacturing ferrite particles
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United States of America Patent
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Nov 29, 2016
Grant Date -
Feb 11, 2016
app pub date -
Feb 26, 2014
filing date -
Mar 28, 2013
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Abstract
There are provided ferrite particles in which Mn ferrite is used as the main phase and which contain Sr ferrite, where the degree of projections and recesses in the surface of the particles falls within a range of 2.5 to 4.5 μm, and the standard deviation of the size of grains appearing on the surface of the particles falls within a range of 1.5 to 3.5 μm. In this way, a coating resin is left on the surface of the particles even after long-term use and thus a decrease in the charging property is reduced.
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