Developing apparatus, developing method, image forming apparatus, and image forming method
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United States of America Patent
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Feb 28, 2017
Grant Date -
Jul 2, 2015
app pub date -
Dec 17, 2014
filing date -
Dec 26, 2013
priority date (Note) -
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Abstract
The developing apparatus includes a toner, a developing container, a developing roller, and a toner layer thickness controlling member,
- wherein the toner contains toner particles containing a binder resin and a colorant, and silica fine particles; the covering rate X1 of the surface of each of the toner particles with the silica fine particles is 40.0 to 75.0 area %; and a diffusion index represented by X1/X2 satisfies a predetermined range where the theoretical covering rate with the silica fine particles is defined as X2,the developing roller includes a substrate, a base layer, and a coverage portion; and the volume resistivity of the coverage portion and the average thickness of the coverage portion are within predetermined ranges.
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