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AssigneeSharp Kabushiki Kaisha
InventorsToshihisa Ishida, Tatsuo Imafuku, Junichi Saito, Takahiro Bito
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The present invention provides an electrophotographic developer which reduces toner contamination on the surface of a developer carrier even when a development effective range is narrowed and which is stabilized in an image quality in every environmental situation and has a long life and a low cost and an image-forming method using the same. In the present invention, used for the electrostatically charged-image holder described above having a radius of curvature of 18 mm or less in a development effective range is the electrophotographic developer which is a two-component developer comprising a toner comprising at least a binder and a colorant and a carrier which is coated with a resin and has a weight average particle diameter of 40 to 100 μm, wherein the above toner has a volume average particle diameter of 8 to 11.5 μm, and the toner particles having a diameter of 6.35 μm or less account for 20 number % or less.
An electrophotographic developer used in steps where it is fed from a developer carrier to develop an electrostatic latent image on an electrostatically charged-image holder and where the above developed image is transferred onto a transferring material, wherein it is used for the electrostatically charged-image holder described above having a radius of curvature of 18 mm or less in a development effective range and is a two-component developer comprising a toner comprising at least a binder and a colorant and a carrier which is coated with a resin and has a weight average particle diameter of 40 to 100 μm;
An image-forming method comprising a step where an electrostatic latent image on an electrostatically charged-image holder is developed with a developer fed from a developer carrier and a step where the above developed image is transferred onto a transferring material, wherein the above electrostatically charged-image holder has a radius of curvature of 18 mm or less in a development effective range;
Dependencies are inferred from the claim text.