Developing device
AssigneeCanon Kabushiki Kaisha
InventorYuta Okuyama
Life of this patent
Estimating the term…
Abstract
A developing device includes a developing sleeve configured to carry and convey developer containing non-magnetic toner and magnetic carrier and having a plurality of concave parts on a surface thereof. The concave parts are periodically arranged in each of a rotation direction and a width direction of the developing sleeve, and each have a shape that can house a circular shape having a diameter equal to an average particle diameter of the carrier carried on the developing sleeve, in a planar view. A distance between the concave parts is smaller than the average particle diameter.
Claims18
A developer bearing member configured to be rotatable and to carry non-magnetic toner and magnetic carrier, the developer bearing member comprising:
- a plurality of concave parts provided on a surface of an entire region where developer is carried, in a rotation axis direction of the developer bearing member,
- wherein each of the plurality of concave parts has a surface size larger than a volume average particle diameter of the carrier, and
- wherein the plurality of concave parts are arranged to make a shortest distance between each of the plurality of concave parts adjacent to each other smaller than the volume average particle diameter of the carrier.
A developing device, comprising:
- a developer bearing member configured to be rotatable and to carry non-magnetic toner and magnetic carrier;
- a magnet provided inside the developer bearing member;
- and
- a plurality of concave parts provided on surface of an entire region where developer is carried, in a rotation axis direction of the developer bearing member,
- wherein each of the plurality of concave parts has a surface size larger than. a volume average particle diameter of the carrier, and
- wherein the plurality of concave parts are arranged to make a shortest distance between each of the plurality of concave parts adjacent to each other smaller than the volume average particle diameter of the carrier.
Dependencies are inferred from the claim text.