Abstract: An electrophotographic member including an electro-conductive substrate, an elastic layer, and a surface layer, the surface layer containing a fine particle and a binder resin, and having a thickness of less than 1.0 ?m, the fine particles having an average particle diameter of from 0.1 ?m to 0.9 ?m, the fine particles having a volume occupancy of 60 vol % to 99 vol % with respect to 100 vol % of the binder resin in the surface layer, the elastic modulus E1 of the fine particle being 1,000 MPa or more, and the elastic modulus E2 of the binder resin being 2 MPa to 200 MPa, and MD-1 hardness H1 of the surface layer being 50° to 100°, and a difference (H1?H2) between the H1 and MD-1 hardness H2 of the elastic layer being 5° or more.

Abstract: An electrophotographic member including an electro-conductive substrate, an elastic layer, and a surface layer, the surface layer containing a fine particle and a binder resin, and having a thickness of less than 1.0 ?m, the fine particles having an average particle diameter of from 0.1 ?m to 0.9 ?m, the fine particles having a volume occupancy of 60 vol % to 99 vol % with respect to 100 vol % of the binder resin in the surface layer, the elastic modulus E1 of the fine particle being 1,000 MPa or more, and the elastic modulus E2 of the binder resin being 2 MPa to 200 MPa, and MD-1 hardness H1 of the surface layer being 50° to 100°, and a difference (H1-H2) between the H1 and MD-1 hardness H2 of the elastic layer being 5° or more.

Abstract: A developing device including: a developer; and a developing member configured to carry the developer on a surface thereof, the developing roller including an electro-conductive substrate and a single-layer elastic layer serving as a surface layer on the substrate, the surface layer comprising a binder resin, and the binder resin contains a crosslinked urethane resin and a crosslinked acrylic resin, the crosslinked urethane resin and the crosslinked acrylic resin form an interpenetrating polymer network structure in a first region from an outer surface of the surface layer to a position at a depth of 0.1 ?m from the outer surface, wherein the developer contains developer particles each containing at least a binder resin and a magnetic substance.

Abstract: A developing apparatus comprising a toner and a toner bearing member for bearing the toner, wherein the volume resistivity of the toner is from 1.0×1010 ?·cm to 1.0×1014 ?·cm, a toner bearing member exhibits multiple elementary processes, the volume resistance value Rdr per unit area of the toner bearing member is from 5.0×105 ?/cm2 to 2.0×108 ?/cm2, the capacitance Cdr per unit area of the toner bearing member is from 300 pF/cm2 to 900 pF/cm2, and the capacitance per unit area and volume resistance value of the toner as converted by a parallel plate capacitor model at a thickness of 1.5 times the weight-average particle diameter of the toner are in specific relationships.