Developing roller, developing device, process cartridge, and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsToshio Kojima, Kyohta Koetsuka, Rei Suzuki
Life of this patent
Estimating the term…
Abstract
A developing roller includes a developing sleeve and a magnet roller disposed within the developing sleeve to attract developer to an outer surface of the developing sleeve by magnetic force. The outer surface of the developing sleeve has a plurality of recesses of circular or elliptic shape in plan view regularly or irregularly arranged therein so as not to overlap.
Claims16
A developing roller comprising:
- a developing sleeve;
- and
- a magnet roller disposed within the developing sleeve to attract developer to an outer surface of the developing sleeve by magnetic force,
- the outer surface of the developing sleeve having a plurality of recesses configured with a predetermined circular or elliptic shape in plan view regularly arranged therein so as not to overlap and so as to convey the developer, wherein
- adjacent ones of the plurality of recesses are arranged on the developing sleeve regularly at a specific interval in each of a circumferential and a longitudinal direction,
- a longitudinal direction of each of the recesses in the outer surface of the developing sleeve is parallel to a longitudinal direction of the developing sleeve, and
- each of the recesses in the outer surface of the developing sleeve has a substantially V-shaped cross section in a circumferential direction of the developing sleeve and has an arc-shaped cross section in the longitudinal direction of the developing sleeve.
A developing roller comprising:
- a developing sleeve;
- and
- a magnet roller disposed within the developing sleeve to attract developer to an outer surface of the developing sleeve by magnetic force,
- the outer surface of the developing sleeve having a plurality of recesses configured with a predetermined circular or elliptic shape in plan view regularly arranged therein so as not to overlap and so as to convey the developer,
- wherein
- adjacent ones of the plurality of recesses are arranged on the outer surface of the developing sleeve regularly at a specific interval in each of a circumferential and a longitudinal direction, and
- a longitudinal direction of each of the recesses in the outer surface of the developing sleeve is parallel to a longitudinal direction of the developing sleeve, and
- each of the recesses in the outer surface of the developing sleeve has an arc-shaped cross section in a circumferential direction of the developing sleeve and has an arc-shaped cross section in the longitudinal direction of the developing sleeve.
A developing device comprising a developing roller, the developing roller having a developing sleeve and a magnet roller disposed within the developing sleeve to attract developer to an outer surface of the developing sleeve by magnetic force,
- the outer surface of the developing sleeve having a plurality of recesses configured with a predetermined circular or elliptic shape in plan view regularly arranged therein so as not to overlap and so as to convey the developer, wherein
- adjacent ones of the plurality of recesses are arranged on the outer surface of the developing sleeve regularly at a specific interval in each of a circumferential and a longitudinal direction,
- a longitudinal direction of each of the recesses in the outer surface of the developing sleeve is parallel to a longitudinal direction of the developing sleeve, and
- each of the recesses in the outer surface of the developing sleeve has a substantially V-shaped cross section in a circumferential direction of the developing sleeve and has an arc-shaped cross section in the longitudinal direction of the developing sleeve.
Dependencies are inferred from the claim text.