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AssigneeCanon Kabushiki Kaisha
InventorsGo Shindo, Daisuke Baba
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A developing apparatus includes: a developing roller; a frame configured to support the developing roller at each of two end portions of the developing roller in a longitudinal direction of the developing roller; and a sealing member configured to seal a space between the frame and each of the two end portions of the developing roller. A first lubricant having an average particle size smaller than a predetermined surface roughness Ra is applied to a first region that is located at each end portion of the developing roller in the longitudinal direction and is in contact with the sealing member. A second lubricant having an average particle size larger than the surface roughness Ra is applied to a second region that is located on an inner side of the first region in the longitudinal direction and is separated from the sealing member and has the surface roughness Ra.
A developing apparatus, comprising:
The developing apparatus according to 1, wherein the developer comprises a non-magnetic one component developer.
The developing apparatus according to 1, wherein a surface roughness in the first regions and a surface roughness in the second region are both less than 1.2 μm.
The developing apparatus according to 1, wherein A-B>0.2 μm is satisfied where a surface roughness in the first regions on the developing roller is indicated by A and an average particle size of the first lubricant is indicated by B.
The developing apparatus according to 1, wherein the first lubricant has a charging polarity opposite to that of the developer borne by the developing roller.
The developing apparatus according to 1, wherein an absolute value of a charge amount per unit area of the first lubricant in the first regions is smaller than an absolute value of a charge amount per unit area of the second lubricant in the second region.
The developing apparatus according to 1, wherein
The developing apparatus according to 1, wherein the sealing member includes a raised-pile layer that is made of a fluorine-based resin and is in contact with the developing roller.
The developing apparatus according to 8, wherein the first lubricant is applied to the raised-pile layer.
A developing roller, comprising:
The developing roller according to 10, wherein the developing roller bears a non-magnetic one component developer.
The developing roller according to 10, wherein the second region is configured to be contactable with a regulating member that regulates a layer thickness of developer borne by the developing roller.
The developing roller according to 10, wherein the first regions and the second region are provided on a surface of an elastic layer of the developing roller.
The developing roller according to 10, wherein a surface roughness in the first regions and a surface roughness in the second region are both less than 1.2 μm.
The developing roller according to 10, wherein A-B>0.2 μm is satisfied where a surface roughness in the first regions is indicated by A and an average particle size of the first lubricant is indicated by B.
A developing apparatus, comprising:
Dependencies are inferred from the claim text.