Developing roller, developing apparatus, and image forming...

Details Developing roller, developing apparatus, and image forming... Developing roller, developing apparatus, and image forming...

2011-06-28

2011-06-28

Lee, Susan S (Department: 2884)

Electrophotography

Image formation

Development

Reexamination Certificate

active

07970322

ABSTRACT:
A developing roller includes a cylindrical sleeve that holds developer on a peripheral surface thereof, and a magnet roller being provided in the sleeve and having a plurality of magnetic poles. The sleeve includes a plurality of micro-recesses formed on the peripheral surface thereof, and the plurality of micro-recesses are arranged dispersedly in the axial direction and the circumferential direction of the sleeve. The densities of the micro-recesses in both end portions of the sleeve are larger than the density of the micro-recesses in a central portion of the sleeve.

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patent: 7599650 (2009-10-01), Katoh et al.
patent: 2007/0110484 (2007-05-01), Yamada et al.
patent: 2008-139650 (2008-06-01), None

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