Patent application number | Description | Published |
20130223886 | CHARGING MEMBER, ELECTROPHOTOGRAPHIC PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention aims to achieve compatibility between high conductivity and durability against the application of a DC voltage in the charging member of an electrophotographic apparatus for maintaining the image quality of the electrophotographic apparatus in association with an increase in speed of the electrophotographic apparatus and more severe use conditions thereof in recent years. Provided is a charging member having a conductive support and a conductive elastic layer, in which: the elastic layer contains a polymer having an alkylene oxide chain in a molecule thereof, an ion conductive agent, and a polyrotaxane; and the polyrotaxane has a structure in which a linear molecule penetrates the inside of the ring of a cyclic molecule having an ionic group, the linear molecule has two block groups, and the block groups are placed at both terminals of the linear molecule to prevent the cyclic molecule from leaving the linear molecule. | 08-29-2013 |
20130236214 | ELECTRO-CONDUCTIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is an electro-conductive member in which a C set hardly occurs. The electro-conductive member is an electro-conductive member including an electro-conductive substrate and a porous rubber elastic layer, in which the porous rubber elastic layer includes closed cells including particles, and the particles are not fixed to inner walls of the closed cells. | 09-12-2013 |
20130251403 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - The charging member includes: an electrically conductive support; and an electrically conductive surface layer, in which the surface layer includes a first polyrotaxane and a second polyrotaxane; the first polyrotaxane has a structure in which a first straight-chain molecule passes through an inside of a ring of a first cyclic molecule; the second polyrotaxane has a structure in which a second straight-chain molecule passes through an inside of a ring of a second cyclic molecule; and the first polyrotaxane and the second polyrotaxane are bound together through formation of a chemical bond between the first cyclic molecule and the second cyclic molecule. | 09-26-2013 |
20140221183 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS - In order to maintain the image quality of a recent high-speed electrophotographic apparatus, a charging member is provided which hardly causes charging unevenness of a photosensitive member even when vibration of the photosensitive member occurs. The charging member includes an electro-conductive support, an electro-conductive elastic layer, and a surface layer. The elastic layer contains a resin having an epichlorohydrin chain in the molecular structure and a specific flavonoid compound having two or more hydroxyl groups in the molecular structure. | 08-07-2014 |
20140274628 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS - A charging member is provided, suppressing the occurrence of streak-like images resulting from resistance increase caused by degradation of the charging member due to electric conduction for a long period. A process cartridge and an electrophotographic apparatus are also provided, suppressing the occurrence of streak-like images and stably forming a high-quality electrophotographic image. | 09-18-2014 |
20140295336 | ELECTROPHOTOGRAPHIC PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - Uneven charging is improved, and production of a banding image attributed to a slip between the charging member and the electrophotographic photosensitive member is suppressed. An electrophotographic process cartridge including a charging member and an electrophotographic photosensitive member which is electrically charged upon being brought into contact with the charging member, wherein the charging member includes a electro-conductive substrate and a surface layer formed on the electro-conductive substrate; the surface layer contains at least a binder resin, an electron conductive agent, and a resin particle having a plurality of pores inside thereof; the surface of the surface layer has a protrusion derived from the resin particle; the electrophotographic photosensitive member includes a support and a photosensitive layer formed on the support; and the surface layer of the electrophotographic photosensitive member contains a specific component. | 10-02-2014 |
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 |