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US 9,851,656 B2Granted
Developing roller, toner and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsKeiichiro Juri, Makoto Matsushita, Hideaki Yasunaga
Life of this patent
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Abstract
A developing roller includes a conductive axis body; a conductive elastic layer overlying the conductive axis body; and a toner bearing layer overlying the conductive elastic layer and having a surface dispersed with particles having an average particle diameter of from 11 nm to 40 nm. The rotary torque is from 2.5 N to 3.5 N.
Claims10
A developing roller, comprising:
- a conductive axis body;
- a conductive elastic layer overlying the conductive axis body;
- and
- a toner bearing layer overlying the conductive elastic layer and having a surface dispersed with particles having an average particle diameter of from 11 nm to 40 nm,
- wherein a rotary torque of the developing roller is from 2.5 N to 3.5 N when the developing roller is rotated at 180 rpm, and
- wherein the toner bearing layer includes concavities and convexities adjacent to each other having gaps therebetween of from 1 to 3 μm.
3 more elements
A developing roller, comprising:
- a conductive axis body;
- a conductive elastic layer overlying the conductive axis body;
- and
- a toner bearing layer overlying the conductive elastic layer and having a surface dispersed with particles having an average particle diameter of from 11 nm to 40 nm,
- wherein a rotary torque of the developing roller is proportional to a force of 2.5 N to 3.5 N detected when the developing roller is rotated at 180 rpm, and
- wherein the toner bearing layer includes concavities and convexities adjacent to each other having gaps therebetween of from 1 to 3 μm.
3 more elements
Dependencies are inferred from the claim text.