Developing device, image forming apparatus, and image...

Details Developing device, image forming apparatus, and image... Developing device, image forming apparatus, and image...

2011-03-15

2011-03-15

Gray, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S284000

Reexamination Certificate

active

07907877

ABSTRACT:
A developing device has a rotatable toner bearing member that bears toner having a particulate external additive externally added to core particles. Projecting sections are arranged in a regular manner on a surface of the toner bearing member. A longitudinal direction of a regulation member runs along an axial direction of the toner bearing member, and a leading edge of the regulation member in lateral and thickness directions faces an upstream side in a rotating direction of the toner bearing member. A relationship among the volume mean toner particle size A, the volume mean external additive particle size B, the ten-point average protrusion roughness. C, and the distance D between the leading edge and projecting sections is C <B <D <A.

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