A charging roller includes a conductive support, and a roller body to rotate about the conductive support. The roller body includes a conductive elastic layer to contact the conductive support, and a conductive resin layer located around the conductive elastic layer to form a surface of the roller body. The surface has ten-point average roughness Rzjis of approximately 20 μm to 30 μm. The conductive resin layer contains polyrotaxane.

Provided is a charging roller that can achieve excellent image quality and prevent detachment of particles in its surface layer. A charging roller 1 comprises a shaft 2 and, on an outer circumferential side of the shaft 2, at least a base layer 3 and a surface layer 4, wherein the surface layer 4 contains a binder resin 41 and particles 42, and the particles 42 contain 50 mass% or more of a same component A as at least one selected from components constituting the binder resin 41, and a content of the particles in the surface layer is 30 parts to 120 parts by mass with respect to 100 parts by mass of the binder resin.

Provided is a charging roller that can achieve excellent image quality and prevent detachment of particles in its surface layer. A charging roller 1 comprises a shaft 2 and, on an outer circumferential side of the shaft 2, at least a base layer 3 and a surface layer 4, wherein the surface layer 4 contains a binder resin 41 and particles 42, and the particles 42 contain 50 mass% or more of a same component A as at least one selected from components constituting the binder resin 41, and a content of the particles in the surface layer is 30 parts to 120 parts by mass with respect to 100 parts by mass of the binder resin.

The invention relates to a carriage of a linear motion guide for arranging on a rail of the linear motion guide, said carriage having an at least substantially U-shaped cross-section and having at least one substantially U-shaped base body (15) which is supplemented with plastic components, wherein the carriage, in both legs of the U-shape, is in each case connected to at least one self-contained rolling body housing (7) which is kept open towards the rail in order to guide as precisely as possible on the rail and nevertheless being easy to assemble. According to the invention, at least parts of inner and outer boundary surfaces of a return channel (10) and both deflection channels (11) of one of the rolling body housings in the respective leg are formed by means of a one-piece plastic component in both legs of the carriage.

Disclosed is a paper-sheet-feeding/conveying roller having a shaft, and a bi-layer roller material which is formed of an inner layer provided on the shaft and an outer layer. The inner layer provided on the shaft is a foamed elastic layer. The outer layer provided on the foamed elastic layer is a non-foamed elastic layer. The foamed elastic layer is formed of a foamed elastic body of silicone-modified EPDM.

Provided is an electrophotographic electroconductive member, including: an electroconductive support; an electroconductive layer; and a surface layer in order, wherein an impedance is 1.0×10.sup.3Ω to 1.0×10.sup.8Ω at an outer surface of the electroconductive member, in the surface layer, an electronic electroconductive agent is dispersed, the electroconductive layer has a matrix containing a cross-linked product of a first rubber and domains each containing a cross-linked product of a second rubber and electroconductive particles, and wherein, and wherein among the domains observed in specified observation regions, 80% by number or more of the domains satisfy (1) and (2): (1) a proportion of sectional areas of the electroconductive particles with respect to the domain is 20% or more; (2) A/B is 1.00 to 1.10 when A is a perimeter of the domain and B is an envelope perimeter.

Provided is an electrophotographic electroconductive member, including: an electroconductive support; an electroconductive layer; and a surface layer in order, wherein an impedance is 1.0×10.sup.3Ω to 1.0×10.sup.8Ω at an outer surface of the electroconductive member, in the surface layer, an electronic electroconductive agent is dispersed, the electroconductive layer has a matrix containing a cross-linked product of a first rubber and domains each containing a cross-linked product of a second rubber and electroconductive particles, and wherein, and wherein among the domains observed in specified observation regions, 80% by number or more of the domains satisfy (1) and (2): (1) a proportion of sectional areas of the electroconductive particles with respect to the domain is 20% or more; (2) A/B is 1.00 to 1.10 when A is a perimeter of the domain and B is an envelope perimeter.

Provided is an electrophotographic electro-conductive member including a support having an electro-conductive outer surface, and an electro-conductive layer. The electro-conductive layer has a matrix containing a crosslinked product of a first rubber and domains containing a crosslinked product of a second rubber and an electron conductive agent. When measuring an impedance by applying alternating voltage between the outer surface of the support and a platinum electrode on an outer surface of the electro-conductive layer while changing a frequency, a slope at specific frequencies is −0.8 to −0.3 in a double logarithmic plot, and an impedance at specific frequency range is 1.0×10.sup.4Ω to 1.0×10.sup.11Ω. When measuring an impedance by applying alternating voltage between the outer surface of the support and a platinum electrode on an outer surface of the electrophotographic electro-conductive member while changing a frequency, an impedance at specific frequency range is 1.0×10.sup.5Ω to 1.0×10.sup.11Ω.

An electroconductive roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The arithmetic mean peak curvature S.sub.pc of a surface of the surface layer is equal to or greater than 1,880 (1/mm), and is equal to or less than 14,024 (1/mm) The density of peaks S.sub.pd of the surface of the surface layer is equal to or greater than 93,406 (1/mm.sup.2), and is equal to or less than 151,476 (1/mm.sup.2). The surface area of the surface layer per unit projected area is equal to or greater than 1.255, and is equal to or less than 5.132.

A charging roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The average of heights of contours of convex portions on a surface of the surface layer relative to an average cylindrical surface obtained by averaging surface irregularities of the surface layer is equal to or greater than 2.0 micrometers and is equal to or less than 8.4 micrometers. The average of intervals between apexes of the convex portions on the surface of the surface layer is equal to or greater than 6.7 micrometers and is equal to or less than 39.8 micrometers.