Patent application number | Description | Published |
20120045250 | CHARGING MEMBER, PROCESS FOR ITS PRODUCTION, AND ELECTROPHOTOGRAPHIC APPARATUS - To provide a charging member that can not easily cause faulty cleaning. A charging member having a conductive support and an elastic layer that is a surface layer; the elastic layer having on its surface a region having been cured by irradiation with electron rays, where the region having been cured supports at least one type of spherical particles of spherical silica particles, spherical alumina particles and spherical zirconia particles in such a state that the spherical particles are exposed at least in part to the surface of the elastic layer so as to make the surface roughened. | 02-23-2012 |
20120076539 | CHARGING MEMBER - A charging member is provided which can not easily change in charging performance even because of its service over a long period of time. The charging member has a conductive support, an elastic layer and a surface layer. The elastic layer comprises spherical particles in such a way that the spherical particles are exposed at least in part to the surface of the elastic layer so as to make the surface of the elastic layer roughened; the spherical particles are at least one type selected from the group consisting of spherical silica particles, spherical alumina particles and spherical zirconia particles; the surface of the elastic layer is overlaid with the surface layer in such a way that the surface profile of the elastic layer is reflected on the surface profile of the charging member; and the surface layer comprises a high-molecular compound having a specific constituent unit. | 03-29-2012 |
20130295330 | CHARGING MEMBER AND ELECTROPHOTOGRAPHIC APPARATUS - There is provided a charging member having charging performance that is not easily changed even by long-term use. | 11-07-2013 |
20140128233 | CHARGING MEMBER, MANUFACTURING METHOD THEREFOR, A PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - To provide a charging member which suppresses the generation of density nonuniformity in an electrophotographic image caused by charge nonuniformity due to adhesion of charged substances, such as toner particles. There is provided a charging member which has a surface layer, the surface layer includes conductive zinc oxide whiskers each formed of a nuclear portion and four needle crystal portions extending radially outward therefrom, and the needle crystal portions are exposed to form convex portions of a surface of the surface layer. | 05-08-2014 |
20140270853 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is a charging member for suppressing the vibration of a charging roller which occurs owing to a difference in circumferential speed in a longitudinal direction when the roller is rotated to follow a photosensitive member, and suppressing a banding image caused by the vibration of the charging roller over a long period of time. The charging member includes a substrate and an elastic layer. The elastic layer contains a rubber having a polar group and hollow particles each having a shell containing a crystal of calcium carbonate. | 09-18-2014 |
20140301754 | ROLLER MEMBER FOR ELECTROPHOTOGRAPHY, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - The roller member has a substrate and an electroconductive elastic layer. The elastic layer has a crown shape of which an outer diameter at the middle in the lengthwise direction is larger than those at its both ends. The elastic layer includes a bowl-shaped resin particle. The surface of the roller member has concavity derived from an opening of the bowl-shaped resin particle and a protrusion derived from an edge of the opening of the resin particle. The relation in the restoring rate for elastic deformation between at the middle of the roller member and at its both ends is such that: on the surface of the elastic layer the restoring rate is larger at both ends than that at the middle, and at the position of depth t μm from the elastic layer surface the restoring rate is larger at the middle than that at both ends. | 10-09-2014 |
20140308607 | CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention relates to a charging member. The charging member comprises an electro-conductive substrate and an electro-conductive surface layer, wherein the surface layer includes a binder resin, an electro-conductive particle dispersed in the binder resin, and a resin particle that roughens the surface of the surface layer; the surface layer has a plurality of protrusions each derived from the resin particle in the surface thereof; the resin particle that forms the protrusion has a pore inside thereof; has a porosity Vt of porosity is 2.5% by volume or less as a whole; and has a region whose porosity V11 is from 5% by volume to 20% by volume, wherein the region is farthest away from the electro-conductive substrate in the resin particle, and assuming that the resin particle is a solid particle having no pores, the region corresponds to a 11% by volume-occupying region of the solid particle. | 10-16-2014 |
20140334843 | CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - A charging member including an electro-conductive substrate, an electro-conductive elastic layer, and an electro-conductive surface layer, wherein the elastic layer includes a polymer having a unit derived from ethylene oxide and at least one particle selected from the group consisting of graphite particles and graphitized particles; wherein a particle-exposing portion where the particle is exposed is present on the surface of the elastic layer; the surface of the elastic layer including the particle-exposing portions is coated with the surface layer; the surface layer includes binder resin and resin particles dispersed in the binder resin and has a plurality of protrusions derived from the resin particles on the surface; when the resin particles in the surface layer are orthographically projected onto the surface of the elastic layer, areas other than projected areas of the resin particles on the surface of the elastic layer overlap the particle-exposing portion. | 11-13-2014 |
20150087489 | CHARGING MEMBER, METHOD OF PRODUCING THE SAME, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention directs to provide a charging member having a protrusion to which smear is difficult to adhere even in a long-term used, and as a result being capable of exhibiting stable charging performance. The charging member has an electro-conductive substrate and an electro-conductive surface layer, wherein the surface layer includes a binder resin and a resin particle including a plurality of electro-conductive domains inside thereof, the surface layer has a protrusion derived from the resin particle, and the electro-conductive domains are localized in the vicinity of the surface of the resin particle. | 03-26-2015 |