Abstract: It is an object of the present invention to provide an electrophotographic photosensitive member capable of suppressing the environmental fluctuation in the electrical characteristics. The present invention provides the electrophotographic photosensitive member in which the surface layer contains the compound having the specific structure.

Abstract: A cylindrical electrophotographic photosensitive member having concave portions on a surface thereof includes a region A having concave portions at an end portion in an axial direction of the photosensitive member and a region B having concave portions different from those in the region A in a direction toward a center of the axial direction of the photosensitive member from the region A, wherein in the region A, an average value L1 is 20 to 200 ?m, an average value W1 satisfies W1?L1, an average value d1 is 1.7 to 4.0 ?m, and an area ratio a1 is 5 to 65%; and in the region B, an average value L2 is 20 to 200 ?m, an average value W2 satisfies W2?L2, an average value d2 is 0.3 to 1.5 ?m, and an area ratio a2 is 5 to 65%.

Abstract: It is an object of the present invention to provide an electrophotographic photosensitive member capable of suppressing the environmental fluctuation in the electrical characteristics. The present invention provides the electrophotographic photosensitive member in which the surface layer contains the compound having the specific structure.

Abstract: Disclosed is a cylindrical electrophotographic photosensitive member having a region A along an outer surface and a region B along the outer surface. In this electrophotographic photosensitive member, the region A is located on an end side in an axial direction of the electrophotographic photosensitive member relative to the region B, the region A has a specific groove provided on the outer surface of the electrophotographic photosensitive member, an area ratio a1 of the groove is 65% to 100%, the region B has specific concave portions provided on the outer surface of the electrophotographic photosensitive member, and an area ratio a2 of the concave portion is 5% to 65%.

Abstract: A cylindrical electrophotographic photosensitive member having concave portions on a surface thereof includes a region A having concave portions at an end portion in an axial direction of the photosensitive member and a region B having concave portions different from those in the region A in a direction toward a center of the axial direction of the photosensitive member from the region A, wherein in the region A, an average value L1 is 20 to 200 ?m, an average value W1 satisfies W1?L1, an average value d1 is 1.7 to 4.0 ?m, and an area ratio a1 is 5 to 65%; and in the region B, an average value L2 is 20 to 200 ?m, an average value W2 satisfies W2?L2, an average value d2 is 0.3 to 1.5 ?m, and an area ratio a2 is 5 to 65%.

Abstract: Provided is a cylindrical electrophotographic photosensitive member, including a concave/convex portion forming region in which at least one of concave portions and convex portions are formed on a surface of the electrophotographic photosensitive member from a central portion to both end portions in an axial direction of the electrophotographic photosensitive member, wherein a maximum value Lmax and a minimum value Lmin of a distance L from the central portion to one end portion of the concave/convex portion forming region in the axial direction of the surface of the electrophotographic photosensitive member satisfy a specific relation.

Abstract: Provided is a cylindrical electrophotographic photosensitive member, including a concave/convex portion forming region in which at least one of concave portions and convex portions are formed on a surface of the electrophotographic photosensitive member from a central portion to both end portions in an axial direction of the electrophotographic photosensitive member, wherein a maximum value Lmax and a minimum value Lmin of a distance L from the central portion to one end portion of the concave/convex portion forming region in the axial direction of the surface of the electrophotographic photosensitive member satisfy a specific relation.

Abstract: There is provided an electrophotographic photosensitive member having a cylindrical shape, including a plurality of concave portions on a surface thereof, wherein a sum of opening areas of the concave portions is 5% or more and 65% or less based on a total area of a surface layer of the electrophotographic photosensitive member, an average value davg of depths of the concave portions satisfies the following Equation (1), 0.4?davg?3.0(?m)??Equation (1) a sum of opening areas of concave portions having a specific depth d is 95% or more of the sum of the opening areas of the concave portions, an average value Lavg of maximum widths of openings of the concave portions in a circumferential direction of the electrophotographic photosensitive member is 20 ?m or more and 200 ?m or less, and the electrophotographic photosensitive member has at least one specific region B.

Abstract: There is provided an electrophotographic photosensitive member having a cylindrical shape, including a plurality of concave portions on a surface thereof, wherein a sum of opening areas of the concave portions is 5% or more and 65% or less based on a total area of a surface layer of the electrophotographic photosensitive member, an average value davg of depths of the concave portions satisfies the following Equation (1), 0.4?davg?3.0 (?m)??Equation (1) a sum of opening areas of concave portions having a specific depth d is 95% or more of the sum of the opening areas of the concave portions, an average value Lavg of maximum widths of openings of the concave portions in a circumferential direction of the electrophotographic photosensitive member is 20 ?m or more and 200 ?m or less, and the electrophotographic photosensitive member has at least one specific region B.

Abstract: In the electrophotographic photosensitive member of the present invention, a plurality of convex portions having a longest diameter L1 in the generatrix direction of the electrophotographic photosensitive member of 30 ?m or more arid a height H1 of 1 ?m or more are formed on the surface of the electrophotographic photosensitive member, a plurality of convex portions corresponding to the convex portions formed on the surface of the surface layer are formed at the interface between the surface layer and a layer immediately below the surface layer, and the rate of fitting of the convex portions formed on the surface of the surface layer to the convex portions formed at the interface between the surface layer and the layer immediately below the surface layer is 20% or more and 200% or less.

Abstract: The present invention provides an electrophotographic photosensitive member including a support, and a photosensitive layer on the support. The photosensitive layer has a charge generating layer containing a charge generating material and a charge transporting layer containing a charge transporting material, in this order. The charge transporting layer contains (?) a specific polycarbonate resin or a specific polyester resin, (?) the charge transporting material, (?) a methoxybenzene, and (?) a methoxybenzene, a methoxycyclohexane or a methylhexanol having a substituent. The content W? of the (?) is 0.001% by mass or more and 1% by mass or less based on the total mass of the charge transporting layer.

Abstract: In the electrophotographic photosensitive member of the present invention, a plurality of convex portions having a longest diameter L1 in the generatrix direction of the electrophotographic photosensitive member of 30 ?m or more arid a height H1 of 1 ?m or more are formed on the surface of the electrophotographic photosensitive member, a plurality of convex portions corresponding to the convex portions formed on the surface of the surface layer are formed at the interface between the surface layer and a layer immediately below the surface layer, and the rate of fitting of the convex portions formed on the surface of the surface layer to the convex portions formed at the interface between the surface layer and the layer immediately below the surface layer is 20% or more and 200% or less.

Abstract: The subject invention relates to a charge transport layer forming coating liquid containing a charge transport material, at least one selected from the group consisting of polycarbonate resins and polyester resins, at least one of xylene and toluene, and cyclopentanone. The proportion of cyclopentanone in the charge transport layer forming coating liquid is in the range of 50% by mass to 85% by mass relative to the total mass of at least one of xylene and toluene and cyclopentanone.

Abstract: The present invention provides an electrophotographic photosensitive member including a support, and a photosensitive layer on the support. The photosensitive layer has a charge generating layer containing a charge generating material and a charge transporting layer containing a charge transporting material, in this order. The charge transporting layer contains (?) a specific polycarbonate resin or a specific polyester resin, (?) the charge transporting material, (?) a methoxybenzene, and (?) a methoxybenzene, a methoxycyclohexane or a methylhexanol having a substituent. The content W? of the (?) is 0.001% by mass or more and 1% by mass or less based on the total mass of the charge transporting layer.

Abstract: An electrophotographic photosensitive member includes a charge transport layer containing (?) a charge transporting compound, (?) a binding resin in a proportion in the range of 50% by mass to 200% by mass relative to the mass of the charge transporting compound, (?) a compound being at least one of xylene and toluene with a content in the range of 0.01% by mass to 2.00% by mass relative to the total mass of the charge transport layer, and (?) a cycloalkanone with a content in the range of 0.01% by mass to 1.20% by mass relative to the total mass of the charge transport layer. Also, a charge transport layer forming coating liquid contains (??) a charge transport material, (??) at least one selected from the group consisting of polycarbonate resins and polyester resins, (??) at least one of xylene and toluene, and (??) cyclopentanone. The proportion of (??) is in the range of 50% by mass to 85% by mass relative to the total mass of (??) and (??).

Abstract: An electrophotographic photosensitive member includes a charge transport layer containing (?) a charge transporting compound, (?) a binding resin in a proportion in the range of 50% by mass to 200% by mass relative to the mass of the charge transporting compound, (?) a compound being at least one of xylene and toluene with a content in the range of 0.01% by mass to 2.00% by mass relative to the total mass of the charge transport layer, and (?) a cycloalkanone with a content in the range of 0.01% by mass to 1.20% by mass relative to the total mass of the charge transport layer.

Abstract: Provided is an electrophotographic photosensitive member in which a surface of the electrophotographic photosensitive member has: a plurality of specific depressed portions; and a plurality of specific line grooves formed at portions other than the specific depressed portions, and in which when a square region 500 ?m on a side is arranged at an arbitrary position of the surface of the electrophotographic photosensitive member, an area of the plurality of depressed portions in the square region 500 ?m on a side is 95,000 ?m2 or more and 180,000 ?m2 or less.

Abstract: An electrophotographic photosensitive member includes a charge transport layer containing (?) a charge transporting compound, (?) a binding resin in a proportion in the range of 50% by mass to 200% by mass relative to the mass of the charge transporting compound, (?) a compound being at least one of xylene and toluene with a content in the range of 0.01% by mass to 2.00% by mass relative to the total mass of the charge transport layer, and (?) a cycloalkanone with a content in the range of 0.01% by mass to 1.20% by mass relative to the total mass of the charge transport layer.

Abstract: Provided is an electrophotographic photosensitive member in which a surface of the electrophotographic photosensitive member has: a plurality of specific depressed portions; and a plurality of specific line grooves formed at portions other than the specific depressed portions, and in which when a square region 500 ?m on a side is arranged at an arbitrary position of the surface of the electrophotographic photosensitive member, an area of the plurality of depressed portions in the square region 500 ?m on a side is 95,000 ?m2 or more and 180,000 ?m2 or less.