Class / Patent application number | Description | Number of patent applications / Date published |
399176000 | Roller | 88 |
20080232853 | CONFORMABLE, ELECTRICALLY RELAXABLE RUBBERS USING CARBON NANOTUBES FOR BCR/BTR APPLICATIONS - Exemplary embodiments provide bias-able devices for use in electrostato-graphic printing apparatuses using conformable and electrically relaxable rubber materials. The rubber material can include a plurality of nanotubes distributed uniformly and/or spatially-controlled throughout a rubber matrix for providing the rubber material with a uniform mechanical conformability and a uniform electrical resistivity. The rubber material can be used as a functional layer disposed over a conductive substrate such as a conductive core depending on the specific design or engine architecture. Other functional layers can also be disposed over the conductive substrate and/or the rubber material of the bias-able devices including bias charging rolls (BCRs) and bias transfer rolls (BTRs). | 09-25-2008 |
20080232854 | IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable image bearing member on which an electrostatic latent image is formed; a charging member for being supplied with a charging voltage which is a DC voltage not having an AC voltage component and for contacting the bearing member to electrically charge a surface of the bearing member using an electric discharge; a transfer member for transferring onto a transfer material a toner image formed on the surface of the bearing member by developing the electrostatic latent image, at a transfer position; wherein the charging potential of the charging member is different between when the charging member provides a first region with a potential and when the charging member provides a second region with a potential, thus providing a predetermined potential difference between the first region and the second region, and wherein the transfer member is not supplied with a voltage when the second region is at the transfer position, where the first region is a region on the image bearing member which has been charged by the charging member and which is to be an image forming region, and the second region is a region of the image bearing member which is a non-image-forming region in an immediately previous rotation of the image bearing member and which corresponds to the first region on the bearing member. | 09-25-2008 |
20090087220 | CONDUCTIVE RUBBER MEMBER - The conductive rubber member of the invention has a conductive elastic layer to which conductivity has been imparted and which serves as an outermost layer, and a surface-treated layer formed through impregnating a surface of the conductive elastic layer with a surface-treatment liquid containing at least an isocyanate component and an organic solvent, wherein the surface-treated layer is formed of an upper portion on the outermost side, and a lower portion beneath the upper portion, the upper portion has a density of the isocyanate component which is greater on the inner side than on the surface side within the upper portion, and the lower portion has a density of the isocyanate component that gradually decreases inwardly. | 04-02-2009 |
20090116874 | ELECTROPHOTOGRAPHIC PHOTORECEPTOR AND METHOD FOR IMAGE FORMATION USING SAID ELECTROPHOTOGRAPHIC PHOTORECEPTOR - An image-forming method employing an electrophotographic process is provided with which images having high resolution can be obtained and which is less apt to cause image defects even in repetitions of use, does not cause conspicuous image defects even under severe conditions suitable for high resolution, and has excellent electrical characteristics. The object has been accomplished with an electrophotographic photoreceptor for developing an electrostatic latent image formed in the surface thereof with a polymerization toner, the electrophotographic photoreceptor comprising a photosensitive layer which contains a polymer comprising a repeating unit including a partial structure represented by formula (1). | 05-07-2009 |
20090123185 | IMAGING DEVICE COMPONENTS COMPRISED OF HYDROPHOBIC CARBON NANOTUBES - An electrophotographic imaging device includes a charging device, a cleaning device, and a fuser member that each include hydrophobic carbon nanotubes. The use of hydrophobic carbon nanotubes can increases the charging device's, the cleaning device's, and the fuser member's durability, conductivity, and contaminants deposition. | 05-14-2009 |
20090142099 | CONDUCTIVE MEMBER, PROCESS CARTRIDGE USING THE CONDUCTIVE MEMBER, AND IMAGE FORMING DEVICE USING THE PROCESS CARTRIDGE - A conductive member includes, a conductive supporting body, an electric resistance-adjusting layer formed in the conductive supporting body, and a space holding member which is formed on each end of the electric resistance-adjusting layer and has a material different from a material of the electric resistance-adjusting layer, the space holding member constantly maintaining a space between an image carrier and the electric resistance-adjusting layer, and the electric resistance-adjusting layer including a resin composition having a thermoplastic resin (A) containing at least an ether group, a fibrous polymer (B), which do not melt in (A) and has an aromatic skeleton in a molecule, and an electrolyte salt (C). | 06-04-2009 |
20090274487 | CHARGING MEMBER, CHARGING DEVICE INCLUDING THE CHARGING MEMBER, PROCESS CARTRIDGE INCLUDING THE CHARGING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE PROCESS CARTRIDGE - A charging member is provided in which a minute gap between an image support body and the charging member is set widely but even so the charging member does not abnormally discharge easily, the charging member includes a conductive support body | 11-05-2009 |
20100014891 | CONDUCTIVE ELASTIC ROLLER AND IMAGE FORMING APPARATUS COMPRISING THE SAME - This invention is a conductive elastic roller ( | 01-21-2010 |
20100046987 | CHARGING MEMBER, CHARGING DEVICE, IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE - The present invention provides a charging member, a charging device, an image forming apparatus, and a process cartridge that minimize local unevenness in potential of a charged object resulting from soiling of the charging member with soiling microparticles or soiling aggregates, that do not cause image failure such as unevenness in image density and scumming, and that output good images through the life of the charging member. The charging member charges a surface of the object by receiving a voltage while being in contact with the object, and satisfies the condition that Rzjis≦30 and Rsk≦0, where Rzjis represents the ten-point average roughness of a surface of the charging member in contact with the object and Rsk represents the skewness of a roughness curve. | 02-25-2010 |
20100104322 | Image Forming Apparatus - Provided is an image forming apparatus which includes a cylindrical image carrier, on which at least an electrostatic latent image is formed, and a charge roller for non-contact charging the image carrier with a predetermined charge gap, and applies at least an alternating current (AC) voltage to the charge roller to non-contact charge the image carrier, wherein a predetermined number of partition members for partitioning an internal space of the image carrier into a plurality of sub-spaces are arranged at a central position of an axial direction of the image carrier or in the vicinity of the central position of the axial direction of the image carrier, in the image carrier. | 04-29-2010 |
20100142998 | CHARGING ROLLER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention provides a charging roller having a stable chargeability and capable of preventing occurrence of “fogging” on an electrophotographic image. The invention relates to a contact-charging type charging roller which includes a conductive support and a surface layer. The surface layer contains a binder, resin particles containing a carbon black dispersed in the binder, and graphitized particles dispersed in the binder; and the surface layer has, on its surface, convex portions derived from the resin particles, and convex portions derived from the graphitized particles. These convex portions have a specific relationship. | 06-10-2010 |
20100183334 | CHARGING UNIT AND IMAGE FORMING APPARATUS - A charging unit in an image forming apparatus comprising a charging roller that charges a photosensitive drum using a charging bias, an insulating casing surrounding the charging roller, and a metal shield member. The shield member is positioned so as to surround the casing in close contact with the outer peripheral surface of the casing. | 07-22-2010 |
20100247149 | CHARGING MEMBER, PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS - The present invention provides a charging member that includes at least: a base material; and a conductive outermost layer that is disposed on the base material, comes into contact with a body to be charged, has a ten-point average surface roughness Rz of about 2 μm to about 20 μm, and contains (A) a resin and (B) specific conductive particles for forming the surface roughness, the charging member coming into contact with the body to be charged, in a state where a voltage is applied, to charge the body to be charged. | 09-30-2010 |
20110002711 | ELECTROCONDUCTIVE ROLL, CHARGING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - The invention provides an electroconductive roll having at least a surface layer forming an outer peripheral surface of the electroconductive roll. The surface layer contains projections and recesses. The projections contain a plurality of particles. A ratio of an area occupied by particles existing in a cross-section of a projection to an entire area of the cross-section of the projection is larger than a ratio of an area occupied by particles existing in a cross-section of a recess to an entire area of the cross-section of the recess. The invention further provides a process cartridge having a charging roll which is the electroconductive roll and/or a transfer roll which is the electroconductive roll. The invention further provides an image forming apparatus having a charging unit containing the electroconductive roll and/or a transfer unit containing the electroconductive roll. | 01-06-2011 |
20110008070 | IMAGE FORMING UNIT AND IMAGE FORMING DEVICE - An image forming unit has a rotatable electrostatic latent image carrier, a charge member positioned to contact the electrostatic latent image carrier and charge a surface of the electrostatic latent image carrier, and a developing part, which supplies a developer to the electrostatic latent image carrier for obtaining a developer image. The charge member includes a conductive elastic layer and a surface layer formed on a circumferential surface of the conductive elastic layer. The surface layer contains particles having an average particle size of 5 μm-20 μm; and a ratio of a surface area per unit area of the surface layer is in a range from 1.5 to 3.0. | 01-13-2011 |
20110013939 | CONDUCTIVE MEMBER, CHARGING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING DEVICE - A conductive member includes a substrate, an elastic layer provided on the substrate and a surface layer provided on the elastic layer, in which the surface layer has a sea/island structure includes a sea portion containing a first resin and an island portion containing a second resin, and at least the island portion contains carbon black. | 01-20-2011 |
20110044725 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - A charging member is provided which can inhibit defective images due to poor charging and adhering substances from occurring even after being repeatedly used for a long time, and can inhibit deformation and defective images due to the C set, caused by a change in rotational speed accompanying such deformation even after being left standing in a stopping state for a long time. The charging member includes a conductive support and a surface layer. The surface layer includes a binder and resin particles dispersed in the binder, each resin particle having a depressed portion on its surface. Protrusions resulting from the resin particles are formed on the surface of the surface layer. The protrusions each have a depressed portion resulting from the depressed portion of the resin particle, and the surface of the resin particle is covered with the binder. | 02-24-2011 |
20110052262 | COMPOSITION FOR CONDUCTIVE ROLLER, CONDUCTIVE ROLLER, CHARGING UNIT, IMAGE FORMING APPARATUS, PROCESS CARTRIDGE, AND METHOD OF MANUFACTURING CONDUCTIVE ROLLER - A rubber composition for a conductive roller that has at least an elastic layer above an outer periphery of a shaft member having conductivity is provided, the rubber composition including: a binary epichlorohydrin rubber; and a vulcanizing agent that contains at least sulfur, wherein the rubber composition does not contain a quinoxaline vulcanizing agent and a triazine vulcanizing agent. | 03-03-2011 |
20110129258 | CHARGING ROLLER FOR IMAGE FORMING APPARATUS AND MANUFACTURING METHOD THEREOF - Disclosed is a charging roller for an image forming apparatus capable of preventing the formations of surface scratches. The charging roller includes a roller shaft, a roller body formed on the roller shaft and a scratch prevention layer formed on the roller body. The scratch prevention layer contains inorganic crystal of polysilicate. | 06-02-2011 |
20110176833 | CHARGING MEMBER AND ELECTROPHOTOGRAPHIC APPARATUS - To provide a charging member that can have a uniform electrical resistance, can not easily change in electrical resistance even by any long-term continuous electrification and, as a result thereof, may cause less change in its charging performance with time. A charging member having a conductive support and an elastic-material layer; the elastic-material layer comprising a vulcanized rubber; the vulcanized rubber being a vulcanized product of a composition which comprises i) a binder polymer comprising a polymer having a butadiene skeleton and ii) carbon black as electrically conductive particles; and the polymer having a butadiene skeleton has a molecular terminal modified with an atomic group having a specific structure. | 07-21-2011 |
20110200361 | BIAS CHARGE ROLLER COMPRISING OVERCOAT LAYER - Disclosed are bias charge rollers having an overcoat layer. The overcoat layer comprises a phenolic resin and a conductive agent. The resulting bias charge rollers have reduced streaking and increased service lifetimes. | 08-18-2011 |
20110200362 | BIAS CHARGE ROLLER COMPRISING OVERCOAT LAYER - Disclosed are bias charge rollers having an overcoat layer. The overcoat layer comprises an acrylonitrile-butadiene-styrene (ABS) terpolymer and metal oxide particles optionally doped with a doping agent. The resulting bias charge rollers have reduced streaking and increased service lifetimes. | 08-18-2011 |
20110206414 | METHOD FOR MANUFACTURING ELECTRIFYING ROLLER AND ELECTRIFYING ROLLER MANUFACTURED BY THE METHOD - Provided are a method of manufacturing an electrifying roller in which a highly precise electrifying roller can be manufactured at a low cost and with more ease and an electrifying roller manufactured by the method. | 08-25-2011 |
20110222910 | CHARGING DEVICE AND IMAGE FORMING APPARATUS - A charging device includes a charging roll, a voltage application member and a confronting potential varying unit. The charging roll is disposed so as to be in contact with an image holding body on whose surface an electrostatic latent image is to be formed, and charges the image holding body. The voltage application member is disposed so as to be in contact with the charging roll, and applies a voltage to a surface of the charging roll. The confronting potential varying unit varies a surface potential profile of the charging roll in its axial direction in a contact region between the charging roll and the image holding body according to both the number of image-formed sheets and a wear situation of the image holding body so that a surface potential of the image holding body becomes approximately constant in an axial direction of the image holding body. | 09-15-2011 |
20110299891 | IMAGE FORMING APPARATUS - An image forming apparatus, having: an image carrier configured by a positively charged single-layer electrophotographic photosensitive body; a charging device which is based on a contact charging method for charging a circumferential surface of the image carrier while making contact with the circumferential surface of the image carrier; a developing roller which is disposed so as to oppose the image carrier and carry and convey toner on the circumferential surface; and a voltage application unit which applies a developing bias to the developing roller, wherein the frequency of an AC component of the developing bias applied by the voltage application unit is 2.6 to 4.2 kHz. | 12-08-2011 |
20120003011 | Systems and Methods for a Charging Roller - A charging roller for an imaging device may include a shaft having a shaft length; a cylindrical foam layer partially covering the shaft and having a foam thickness, a first foam end and a second foam end, the cylindrical foam layer having a foam length less than the shaft length; a skin layer covering the cylindrical foam layer; and first and second retention members, the first retention member disposed adjacent to the first foam end and the second retention member disposed adjacent to the second foam end. | 01-05-2012 |
20120070193 | CHARGING MEMBER, PROCESS UNIT CARTRIDGE, AND IMAGE FORMING APPARATUS - A charging member includes a conductive metal shaft and a conductive elastic layer. The conductive elastic layer comprises a rubber material containing 50% to 100% by weight of epichlorohydrin rubber containing 56 mol % or more of an ethylene oxide and a calcium oxide having an average particle size D50 of 18 μm or smaller. | 03-22-2012 |
20120082482 | CHARGING ROLLER, IMAGE FORMING APPARATUS, AND RECYCLING METHOD - A charging roller has a conductive shaft, a charge emission member provided to the shaft, and a gap securing member provided to the shaft. The gap securing member (i) protrudes toward the photoreceptor drum so as to be closer to the photoreceptor drum than the charge emission member is to the photoreceptor drum and (ii) is in contact with the photoreceptor drum so as to secure a gap between the charge emission member and the photoreceptor drum. A conductive part of the gap securing member and the shaft are bonded to each other by electrically releasing adhesive, so that the gap securing member is provided to the shaft. | 04-05-2012 |
20120121295 | ELECTRIFICATION APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME - An electrification apparatus includes: an electrification roller that rotates touching an image carrier to electrify a surface of the image carrier; a support member that by means of a bearing portion, supports rotatably a rotation shat which is disposed at an end portion in a shaft direction of the electrification roller; and a cover member that is disposed on the rotation shaft and covers a portion of the rotation shaft which is near the bearing portion. | 05-17-2012 |
20120121296 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is a charging member, which has excellent follow-up property to the rotation of a photosensitive drum and can charge an electrophotographic photosensitive member more stably. The charging member is a charging member, comprising a mandrel, an elastic layer formed on an outer periphery of the mandrel, and a surface layer formed on an outer periphery of the elastic layer, in which the surface layer comprises at least one selected from hydroxylated fullerene and oxidized fullerene, and a binder. | 05-17-2012 |
20120134714 | Electrically Conductive Roller and Image-Forming Device - This invention provides an electrically conductive roller capable of forming an image without fogging even in a low humidity environment and an image-forming device. Specifically, the invention relates to an electrically conductive roller has an elastic layer formed on an outer circumferential surface of a shaft and a urethane coat layer formed on an outer circumferential surface of the elastic layer, wherein the urethane coat layer includes a urethane resin, and at least one ionic liquid selected from the group consisting of pyridinium ionic liquids and amine ionic liquids, in an amount from 1 to 20 parts by mass to 100 parts by mass of the urethane resin; and an image-forming device equipped with the electrically conductive roller. | 05-31-2012 |
20120155922 | Charging device and image forming apparatus using the same - A roll-type charging device contacts an image receptor serving as a body to be charged and is capable of rotating due to rotation of the image receptor. The apparatus includes a hollow roll having a cylindrical shape and formed of a hollow elastic member and flanges having rotation axes and formed of elastic members, the flanges inserted into two ends of the hollow roll to increase an inner diameter of the hollow roll. | 06-21-2012 |
20120177408 | CHARGING MEMBER - Provided is a charging member having an elastic layer to which components derived from a developer hardly adhere even when the charging member is used for a long time period and in which elastic layer the occurrence of compression set is suppressed The charging member includes: a electroconductive support; and a electroconductive elastic layer, in which the elastic layer is formed through irradiation of an electron beam onto a surface of a rubber layer formed of a crosslinked product of a rubber mixture containing an acrylonitrile-butadiene rubber and a styrene-butadiene rubber; the styrene-butadiene rubber has a 1,2-vinyl bond, and at least one selected from a cis-1,4 bond and a trans-1,4 bond; and a ratio of the numbers of moles of the 1,4 bonds to a total number of moles of the 1,2-vinyl bond, the cis-1,4 bond, and the trans-1,4 bond is 31 mol % or more and 61 mol % or less. | 07-12-2012 |
20120201572 | ROLLER FOR IMAGING APPARATUS AND IMAGING APPARATUS INCLUDING THE ROLLER - A roller includes a shaft including reinforcing fiber and a binder resin; and an elastic body surrounding an outer surface of the shaft, wherein an average length to average diameter ratio (L/D) of the reinforcing fiber is from about 15,000:1 to about 50,000:1. | 08-09-2012 |
20120213553 | CHARGING MEMBER, CHARGING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A charging member includes at least a substrate and a conductive outermost layer that is disposed on the substrate, that comes in contact with a charging object, and that includes (A) a resin and (B) aggregates of a plurality of acicular particles protruding in a radial pattern from a center to an outside. The charging member charges the charging object by coming in contact with the charging object in a state where a voltage is applied to the charging member. | 08-23-2012 |
20120243909 | ROLL MEMBER, CHARGING UNIT, PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS - Disclosed is a roll member including a core, and an elastic layer arranged on the core, the elastic layer containing a rubber material and polyalphaolefin. | 09-27-2012 |
20120263499 | ELECTROPHOTOGRAPHIC ELECTRICALLY CONDUCTIVE MEMBER - The present invention provides an electrophotographic electrically conductive member in which conductivity needed for a charging member is secured, and defects in an image attributed to uneven discharging can be minimized independently of a long-term use and an environment of use. An electrophotographic electrically conductive member comprising an electrically conductive support and an electrically conductive layer, wherein the electrically conductive layer includes an ion conductive resin having a quaternary ammonium ion in a molecule structure as a binder resin, and a carrier molecule represented by the following formula (1) or (2): | 10-18-2012 |
20130004205 | SURFACE COATINGS FOR THE BIAS CHARGING ROLLER - Various embodiments provide materials and methods for bias charging members including an outer surface coating overlaying an outer base layer, wherein the outer surface coating can include conductive fillers combined with one or more polymers to provide desirable surface, electrical, and/or mechanical properties. | 01-03-2013 |
20130004206 | CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - A charging member for electrophotographic apparatus is provided which has a superior charging performance for the electrophotographic photosensitive member and also can not easily change with time in charging performance. The charging member has a substrate, an elastic layer and a surface layer, which surface layer contains a high-molecular compound having an Si—O—Ti linkage in the molecular structure and a cyclic polysilane represented by the general formula (7) defined in the specification, and the high-molecular compound has a constituent unit represented by the general formula (1) and a constituent unit represented by the following formula (2) which are defined in the specification. | 01-03-2013 |
20130108325 | CHARGE MEMBER, CHARGE DEVICE AND IMAGE FORMING APPARATUS | 05-02-2013 |
20130136501 | DEVELOPING CARTRIDGE AND IMAGE FORMING APPARATUS HAVING THE SAME - A developing cartridge includes a photoconductive body, a charging unit which charges a surface of the photoconductive body and a developing unit which forms a toner image. The charging unit includes a shaft which applies a charging voltage and which has a central axis parallel to a rotating axis of the photoconductive body, a tubular member of a conductive material which surrounds the shaft, a current carrying member which applies an electric current to the shaft and the tubular member, and a damping member which is disposed between the shaft and the current carrying member. The shaft has a middle portion which is thicker than opposite end portions in a longitudinal direction along the central axis. | 05-30-2013 |
20130170860 | Charge Roller for an Image Forming Apparatus Using Hard Filler Particles - An image forming apparatus includes a charge roller with improved resistance to defects from prolonged periods of nonuse. The charge roller includes an outermost coating layer including a coating material and filler particles. The filler particles have an average particle size larger than an average thickness of the outermost coating layer in a portion without the filler particles. Furthermore, the filler particles are harder and have a higher glass transition temperature than the coating material. | 07-04-2013 |
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 |
20130251406 | METHOD OF MANUFACTURING CHARGING ROLL, CHARGING ROLL, CHARGING UNIT, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A method of manufacturing a charging roll includes forming an adhesive layer, which has elasticity such that the adhesive layer is compressed up to 50% of the thickness and recovers up to 90% of the thickness after the compression is released, on an outer peripheral surface of a cylindrical base material and extruding a material of a conductive elastic layer along with the base material having the adhesive layer formed thereon by the use of an extrusion molding machine to form the conductive elastic layer on an outer peripheral surface of the adhesive layer. | 09-26-2013 |
20130287444 | CHARGING MEMBER, ELECTROPHOTOGRAPHIC APPARATUS, AND PROCESS CARTRIDGE - Provided is a charging member capable of stably charging an object to be charged while suppressing adhesion of toner or an external additive onto a surface of an elastic layer and compression set of an abutting portion of the elastic layer. The charging member is a charging member, comprising a mandrel; and an electro-conductive elastic layer, wherein: the elastic layer has a universal hardness decreasing from a surface toward a depth direction thereof; and the hardnesses at a central portion and both end portions in a longitudinal direction of the charging member satisfy the relationships: in the surface of the elastic layer, the hardnesses at the both end portions are higher than that at the central portion; and at a position having a depth of t (μm) from the surface of the elastic layer, the hardness at the central portion is higher than those at the both end portions. | 10-31-2013 |
20130308982 | CHARGE ROLLERS AND APPARATUS INCLUDING CHARGE ROLLERS - Printers, methods, and apparatus to form an image on a substrate are disclosed. An example disclosed charge roller includes a dielectric outer layer ( | 11-21-2013 |
20130343782 | DELIVERY APPARATUS - There is described an applicator for use in an image forming apparatus. The applicator includes an applicator comprising an elastomeric matrix and a functional material dispersed therein. The applicator includes an actuator for moving the applicator between a first position having the applicator in contact with a surface, and a second position. The actuator moves the applicator from the first position to the second position at a frequency of from about 10 | 12-26-2013 |
20130343783 | IMAGE FORMING APPARATUS - An image forming apparatus includes a positively-charged single layer type electrophotographic photoreceptor, a charging device with a contact charging roller for charging a surface of the photoreceptor and an exposure device for exposing the charged surface of the photoreceptor to light to form an electrostatic latent image thereon. A developing device develops the electrostatic latent image into a toner image and a transfer device transfers the toner image to a transferred body. The charging roller is made of electrically conductive rubber having an Asker-C rubber hardness of 62 to 81°. A roller surface roughness of the charging roller has an average distance (Sm) between asperity peaks on a cross-sectional curve of 55 to 130 μm and that a ten-point average roughness (Rz) is 9 to 19 μm. The image forming apparatus is capable of preventing carrier trapping, film peeling and uneven charging in the photoreceptor. | 12-26-2013 |
20140023397 | CHARGE APPLYING MEMBER AND IMAGE FORMING APPARATUS WITH THE SAME - A charge applying member includes a conductive roller and a shaft. The conductive roller includes a first region in contact with a member to be charged and facing an image forming region of the member to be charged and a second region next to a longitudinal end of the first region and facing a region of the member to be charged outside the image forming region and is configured to apply a charge to the member to be charged. The shaft formed of a metallic material inserted into the conductive roller and configured to be given a voltage from a power supply. A region plated with a metal having a lower ionization tendency than the shaft is formed as a plated region on a surface portion of the shaft corresponding to the first and second regions and a non-plated region is formed on a surface portion of the shaft corresponding to the second region. | 01-23-2014 |
20140037337 | BIAS CHARGE ROLLER AND APPARATUS INCORPORATING THE BIAS CHARGE ROLLER - A bias charge roller includes an electrically conductive core. An outer layer is axially supported on the core. The outer layer is either conductive or semi-conductive. The bias charge roller further includes a continuous raised pattern on the outer surface of the outer layer. The continuous raised pattern is configured to contact a charge-retentive surface of an electrophotographic imaging member so as to charge the charge-retentive surface. The bias charge roller can be employed in an image forming apparatus. | 02-06-2014 |
20140072343 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is a charging member whose surface is suppressed to adhesion of toner or an external additive and is not contaminated easily, and which is less likely to occur a track due to the contact between the charging member and a photosensitive member in an electrophotographic image. The charging member comprises a support, an elastic layer, and a surface layer, wherein the surface layer comprises: a constitutional unit represented by the following general formula (1); a constitutional unit represented by the following general formula (2); a polymer compound having a bond of Si—O—Ti; and phenyl-modified silicone oil having a particular structure. | 03-13-2014 |
20140126933 | APPARATUS, PRINTERS, AND CHARGE ROLLER ASSEMBLIES - Apparatus, printers, and charge roller assemblies are disclosed. An example apparatus includes a roller to charge a printer surface when closer to the printer surface than an upper threshold, and a damper to reduce movement of the roller and to keep the roller closer to the printer surface than the upper threshold. | 05-08-2014 |
20140133888 | CONDUCTIVE MEMBER, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A conductive member includes a conductive supporting body; and
| 05-15-2014 |
20140178103 | IMAGE FORMING APPARATUS, PROCESS CARTRIDGE, AND IMAGE FORMING METHOD - An image forming apparatus, including: an image bearing member; a charging unit; an exposure unit; a developing unit; a transfer unit; a fixing unit; and a cleaning unit including a cleaning blade, wherein the charging unit includes a charging roller that is brought into contact with the image bearing member for charging, the charging roller abutting the image bearing member at a pressing force of 10 mN/cm to 1,000 mN/cm, wherein the cleaning blade includes an elastic member that abuts the surface of the image bearing member to remove a residue attached to the surface of the image bearing member, and wherein an abutment part of the elastic member, which abuts the surface of the image bearing member, includes a cured product of an ultraviolet curable composition containing a (meth)acrylate compound having an alicyclic structure having 6 or more carbon atoms in a molecule. | 06-26-2014 |
20140205323 | CHARGING MEMBER AND ELECTROPHOTOGRAPHIC APPARATUS - The present invention provides a charging member which has a low compression set and which can suppress the generation of image defects. | 07-24-2014 |
20140219681 | CHARGING MEMBER, MANUFACTURING METHOD THEREFOR, AND ELECTROPHOTOGRAPHIC APPARATUS - Provided is a charging member capable of suppressing occurrence of compression set while having flexibility enough to ensure a nip with a photosensitive member. The charging member comprises a support and an elastic layer, wherein the elastic layer has an MD-1 hardness of from 55 to 85° at the surface thereof, and has a universal hardness of 2.0 to 20.0 N/mm | 08-07-2014 |
20140219682 | CHARGING ROLLER - A charging roller includes a conductive core, a resistive elastic layer disposed on the conductive core, and a surface layer disposed on the resistive elastic layer. The impedances of the resistive elastic layer and the surface layer measured at an environmental temperature of about 10° C. and a humidity of about 15% RH in a range of alternating voltage frequencies of an image-forming apparatus used satisfy: | 08-07-2014 |
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 |
20140369717 | Printing With Metal-Surface Charge Element in Glow Discharge Regime - Techniques related to printing using a metal-surface charge element. A metal-surface charge element includes at least one metal charge roller to deposit electric charge on an imaging surface. Each metal charge roller includes a metal external surface in charge-transferring relation with the imaging surface and in a glow discharge regime during operation of the printing system for printing. | 12-18-2014 |
20140376965 | ANGLED ALIGNMENT METHOD FOR LIQUID MATERIALS APPLICATOR IN BETTER CONTACT WITH P/R OR BCR TO MINIMIZE TORQUE DURING CYCLING - An image forming apparatus includes an electrophotographic photoconductive member and a delivery unit. The delivery unit is disposed in contact with a surface of the photoconductive member to apply a layer of functional materials to the surface of the photoconductive member, wherein a cylindrical axis of the delivery unit is angled with respect to a cylindrical axis of the photoconductive member to increase uniformity of the functional materials layer. An image forming apparatus an electrophotographic photoconductive member, a charging unit and a delivery unit disposed in contact with the surface of the charging unit, wherein the delivery unit applies a layer of functional materials to the surface of the photoconductive member. and a cylindrical axis of the delivery unit is angled with respect to a cylindrical axis of the charging unit to increase the uniformity of the functional materials layer | 12-25-2014 |
20150016844 | CHARGING MEMBER, CHARGING UNIT, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND METHOD OF MANUFACTURING CHARGING MEMBER - A charging member includes a conductive support, and a conductive elastic layer that is provided on an outer peripheral surface of the conductive support and includes a rubber material and inorganic particles, and in which an average dispersion degree of aggregates of the inorganic particles is 95% or greater and a maximum particle diameter of the aggregates of the inorganic particles is 200 μm or less. | 01-15-2015 |
20150023698 | CONDUCTIVE ROLLER AND IMAGE FORMING APPARATUS HAVING THE SAME - A conductive roller includes a roller body, a spindle, and at least one groove. The roller body contacts with an outer circumferential surface of an image carrier, and is conductive. The spindle is provided in a center of the roller body. The groove is formed in each of side walls of the roller body at opposite ends in an axis direction of the roller body, and extends outward in a radial direction from the spindle. | 01-22-2015 |
20150037070 | Printing Using a Metal-Surface Charging Element - Techniques related to printing using a metal-surface charging element. A printing system includes a metal-surface charging element and a power supply. The charging element is disposed to deposit electric charge on an imaging surface. The power supply may provide electric power with an alternating current (AC) component and a direct current (DC) component to the charging element. | 02-05-2015 |
20150050052 | CHARGING ROLL, CHARGING UNIT, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND METHOD OF MANUFACTURING CHARGING ROLL - A charging roll includes a cylindrical base member that has a metal-containing surface, a conductive adhesive layer that includes a halogen atom-containing resin and has surface roughness Rz in a range of 0.5 μm to 8 μm on an outer peripheral surface side on the base member, and a conductive elastic layer that is disposed to be brought into contact with the outer peripheral surface of the conductive adhesive layer and includes a halogen atom-containing rubber. | 02-19-2015 |
20150093151 | ELECTROCONDUCTIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - The electroconductive member has an electroconductive support and a surface layer formed on the electroconductive support, wherein the surface layer has a porous body having a continuous open pore, and the electroconductive member satisfies the following (1) and (2):
| 04-02-2015 |
20150125183 | CHARGING MEMBER, CHARGING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS - A charging member includes a conductive elastic layer, and a conductive surface layer that is disposed on the conductive elastic layer, is in contact with an image holding member, and contains a resin, porous resin particles, and silicone oil, wherein a content of the porous resin particles is from 3 parts by weight to 25 parts by weight based on 100 parts by weight of the resin, and a content of the silicone oil is from 0.1 part by weight to 10 parts by weight based on 100 parts by weight of the resin. | 05-07-2015 |
20150125184 | CHARGING DEVICE, IMAGE FORMING UNIT AND IMAGE FORMING APPARATUS - A charging device includes a charging member that charges a surface of an image bearing body. The charging member includes a rotation shaft applied with a voltage, and a resilient conductive layer provided on an outer circumferential surface of the rotation shaft. The resilient conductive layer charges the surface of the image bearing body. The resilient conductive layer has a plurality of high resistance regions arranged at intervals in an axial direction of the rotation shaft. | 05-07-2015 |
20150301469 | CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS - Provided a charging member including an electro-conductive substrate and a surface layer. The surface layer includes a binder resin, and a resin particle that roughens the surface layer. A surface of the charging member has a plurality of protrusions each derived from the resin particle. The resin particle has a pore inside thereof, has a porosity Vt of 1.5% by volume or more and 45.0% by volume or less, and has a first and second regions. The first region has a porosity V | 10-22-2015 |
20150346624 | Charge Roll Mounting Assembly for an Electrophotographic Image Forming Device - An assembly for an electrophotographic image forming device according to one example embodiment includes a charge roll and a bracket that extends along an axial length of the charge roll. First and second bearing retainers are positioned on a first axial end and a second axial end of the bracket, respectively. First and second bearings are pivotally mounted to the first and second bearing retainers, respectively. Each of the first and second bearings has a charge roll opening that supports a respective axial end of a shaft of the charge roll. First and second biasing members act on the first and second bearings, respectively. The first and second biasing members bias the charge roll toward an operative position for charging a photoconductive drum. A direction of force from the first biasing member on the first bearing and from the second biasing member on the second bearing is toward the bracket. | 12-03-2015 |
20150355565 | CHARGING ROLLER, PROCESS CARTRIDGE, AND MANUFACTURING METHOD OF CHARGING ROLLER - A charging roller includes a conductive base material, a conductive adhesive layer that has a gel fraction equal to or greater than 50% on an outer circumferential surface of the base material, and a conductive elastic layer on the adhesive layer. | 12-10-2015 |
20150355566 | CHARGING ROLLER, CHARGING DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME, AND METHOD OF CALCULATING RESISTANCE OF CHARGING ROLLER - A charging roller to apply voltage to a target to charge the target has a surface having a color set in one of a range according to CIE L*a*b* color space and a range according to CIE XYZ color space, and the range according to CIE L*a*b* color space is defined as 32.6≦L*≦50.9, 0.51≦a*≦1.12, and 6.0≦b*≦8.4; and the range according to CIE XYZ color space is defined as 8.8≦X≦21.0, 9.1≦Y≦21.3, and 5.7≦Z≦11.8. | 12-10-2015 |
20160041489 | IMAGE FORMING APPARATUS AND IMAGE FORMING UNIT - Provided is an image forming apparatus including an image holder that is provided to be rotatable, and a charging member that includes a charging member main body and a cover member, in which an outer circumferential surface of the cover member is disposed to be in contact with the image holder, and that charges the image holder, wherein a circumferential speed of one member of the rotating image holder and the rotating charging member main body is greater than a circumferential speed of the other member, and wherein the cover member moves to follow a movement of the one member at a contact portion where the cover member and the image holder come into contact with each other, and a portion of the cover member that is positioned on an upstream side of the contact portion is drawn toward a downstream side. | 02-11-2016 |
20160041491 | ELECTROCONDUCTIVE ROLLER, AND IMAGE FORMING APPARATUS - An electroconductive roller is provided, which is imparted with lower resistance than a prior-art electroconductive roller without addition of an expensive salt and an electron conductive agent liable to cause various problems or by adding the electron conductive agent in a smaller proportion that hardly causes the problems, and an image forming apparatus employing the electroconductive roller is also provided. The electroconductive roller ( | 02-11-2016 |
20160062259 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - A charging member includes an electro-conductive substrate and an electro-conductive resin layer. The electro-conductive resin layer contains a binder, a plurality of bowl-shaped resin particles, and a plurality of hollow particles. The charging member has a surface having recesses due to openings of the bowl-shaped resin particles and protrusions due to edges of the openings of the bowl-shaped resin particles, where the positional relationship between one bowl-shaped resin particle and the hollow particles lying in the vicinity of the bowl-shaped resin particle is that the number of the hollow particles being in the space under the bowl-shaped resin particle in a predetermined depth is at least four in average. | 03-03-2016 |
20160154335 | MEMBER FOR ELECTROPHOTOGRAPHY, METHOD FOR PRODUCING THE SAME, AND IMAGE FORMING APPARATUS | 06-02-2016 |
20160154336 | MEMBER FOR ELECTROPHOTOGRAPHY, PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS | 06-02-2016 |
20160154366 | ELECTROCONDUCTIVE MEMBER FOR ELECTROPHOTOGRAPHY, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC IMAGE-FORMING APPARATUS | 06-02-2016 |
20160161877 | CHARGING MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS - A charging member capable of inhibiting the effect of the contact mark on the electrophotographic image, even after in contact with another member for a long term, is provided. The charging member has a surface layer on a support, the surface layer containing a polymer compound having a structural unit represented by the following formula (1): | 06-09-2016 |
20160170322 | IMAGE FORMING UNIT AND IMAGE FORMING APPARATUS PROVIDED WITH SAME | 06-16-2016 |
20160252836 | ELECTROCONDUCTIVE ROLLER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS | 09-01-2016 |
20160252878 | CARTRIDGE AND IMAGE FORMING APPARATUS | 09-01-2016 |
20160378012 | CHARGING MEMBER - There is provided a charging member ( | 12-29-2016 |
20170235246 | RESISTIVE FILM WITH DUCTILE PARTICLES | 08-17-2017 |
20180024459 | ELECTROCONDUCTIVE MEMBER FOR ELECTROPHOTOGRAPHY, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS | 01-25-2018 |
20180024460 | CHARGING MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS | 01-25-2018 |
20220137527 | CHARGING ROLLER WITH POLYROTAXANE - 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. | 05-05-2022 |