Abstract: A development system that contains a developer carrier for carrying a developer on the surface thereof to a development region opposite to an image bearing body, and a regulating member biased into contact with the surface of the developer carrier by a predetermined pressure for regulating an amount of developer carried by a developer transport member. The developer carrier has a surface coated with fine particles with an average particles size of between 3 and 30 .mu.m which are bonded with the surface.

Abstract: A developing apparatus which is equipped with a developer control member for controlling the developer on a developer supporter to a prescribed thickness, and which uses a one-component developer, characterized in that recessed sections are formed at the surface of the developer supporter to receive the developer, and the density .alpha. of particles of the developer which enter the recessed sections and the nip width L1 between the developer control member and the developer supporter satisfy the relationship: 3<.alpha..multidot.L1<10.

Abstract: A method of developing latent electrostatic images and a developer-bearing member for use in the method are disclosed, which method includes the steps of (a) forming numerous micro closed electric fields near the surface of a rotatable developer-bearing member which comprises an electroconductive support and a surface layer formed thereon comprising an electroconductive organic polymeric matrix and numerous minute charge-retainable insulating segments distributed at least one the surface of the surface layer, by electrically charging the surface of the charge-retainable insulating segments; (b) supplying a one-component type developer comprising toner particles to the rotatable developer-bearing member to hold the developer on the rotatable developer-bearing member to hold the developer on the rotatable developer-bearing member by the numerous micro closed electric fields; and (c) bringing the rotatable developer-bearing member near or into contact with a latent-electrostatic-image-bearing member which bears

Abstract: A process for producing an aluminum pipe is disclosed which has the steps of cutting the aluminum pipe on its periphery, and thereafter carrying out rotary pressure rolling. Also, an electrophotographic photosensitive member, a device unit, an electrophotographic apparatus and a developing roll having the aluminum pipe are disclosed.

Abstract: A developing roller includes a magnet roller and a rotatable sleeve thereon. The sleeve is covered with a surface coating of a metal, alloy, metal nitride, metal oxide, metal carbide or metal sulfide by dry plating. The coating has a resistivity of up to 0.01 .OMEGA.cm. The sleeve is fully wear resistant at its surface. Formation of the coating by dry plating minimizes the variation of coating thickness to improve the dimensional precision of the sleeve surface. The developing roller and a developing apparatus equipped therewith can produce images of quality for a long time.

Abstract: A developing roller (1) having a thin layer of a developer (4) carried thereon and a drum (3) bearing an electrostatic latent image on its surface are rotated in close relationship, thereby feeding the developer (4) to the surface of the drum (3) for visualizing the electrostatic latent image thereon. The ionization potential of the developing roller (1) surface is adjusted to be below the ionization potential of the developer (4) surface when the developer is charged negative and above the ionization potential of the developer (4) surface when the developer is charged positive. The developer has an ionization potential of 4.5-5.5 eV. When using negatively charged developer, the development roller should preferably contain a lubricant or non-ionic surfactant and should preferably be made of a polyurethane containing a polyisocyanate so as to obtain the desired ionization potential.

Abstract: A developer roll for use in an electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member in which a voltage differential is applied between the roll and a region adjacent the roll is provided. The developer roll includes a wound roll of media and a layer of resin. The wound roll is formed from a sheet of the media. The layer of resin is applied to the periphery of the wound roll. The layer of resin and the roll of media are selected of materials to obtain a decay rate relating to the electrical response of the layer of resin to the applied voltage differential.

Abstract: A developer cartridge for image forming apparatuses which performs development to form images with non-magnetic, one-component type developer. The cartridge includes a developing roller for supplying developer to a photoconductor drum, a developer feed roller in non-contact with the developing roller for supply developer to the developing roller, and a developer-layer thickness control member for controlling the thickness of the developer layer on the developing roller. The developer feed roller is shaped as a regular polygonal prism. Since no recesses are formed in the surface of the regular polygonal prism, driving torque does not increase when developer is scrubbed from the prism, thus ensuring consistent operation and improved image quality. Non-magnetic, one-component type developer is compressed onto the developing roller by supplying the developer via the developer feed roller into a bottleneck between the developing roller and a developer applying member.

Abstract: In an electrophotographic image forming apparatus of the type using single-ingredient type high resistance toner, a developing roller or similar toner conveyor roller is covered with a dielectric layer which is comparatively thick at opposite end portions than at an intermediate portion. A conductive or semiconductive elastic layer underlies the dielectric layer. With the above configuration, the dielectric layer is prevented from coming off the roller. This, coupled with the tact that the elastic layer does not contact a photoconductive element, eliminates current leaks and thereby extends the life of the roller and photoconductive element.

Abstract: An electrostatic assist roller (30) for use in a coating, printing or copying machine includes a cylindrical roller core (35), and a ceramic layer (38) formed by plasma spraying a blend of an insulating ceramic material and a semiconductive ceramic material in a ratio which is selected to control the resistance and thickness of the ceramic layer in response to an applied voltage differential. The semiconductive ceramic layer (38) is sealed with a solid, low viscosity sealer (39), such as Carnauba wax, to protect the ceramic layer (38) from moisture penetration. A second ceramic layer (37) may be used to insulate the semiconductive ceramic layer (38) from the core (35).

Abstract: A developing device is used to develop an electrostatic latent image with a one-component type developer, the latent image being formed on a photosensitive body. The device has a developing roller made of a conductive rubber, and a conductive sponge roller engaged with the developing roller to feed the developer to the developing roller. The rollers are rotated in the same direction, and the developer fed to a nip between the rollers is subjected to triboelectrification by the rollers, whereby the developer is electrically charged. The charged developer is electrostatically adhered to the surface of the developing roller due to an electrostatic image force acting therebetween. The sponge roller has a friction plate associated therewith, for effectively and additionally charging the developer. Also, the developing roller has a developer-removing plate associated therewith, for removing residual developer, not used for development of latent images, from the developing roller.

Abstract: A cylindrical member such as a developing roller or photosensitive drum has a sleeve, a flange at the end portion of the sleeve, and a space-controlling member provided at the end portion of the sleeve. The flange is press-fitted into the end portion of the sleeve to be bonded to the sleeve. A space-controlling portion of the space-controlling member is located further from the end of the sleeve than the press-fitted portion of the flange.

Abstract: A developer support supplies a charge developer to an electrostatic latent image formed on an electrostatic latent image holder. The developer support has a nonmagnetic substrate in a shape of a hollow cylinder, wherein the substrate comprises at least one metal with an amorphous film formed on the nonmagnetic substrate. The amorphous film consists essentially of an element selected from Cr or Zn, the at least one metal, O, and H.

Abstract: A donor roll for the conveyance of toner in a development system for an electrophotographic printer includes an outer surface of phenolic resin. The resin is doped to a suitable conductivity to facilitate a discharge time constant thereon of less than 300 microseconds. The donor roll is used in conjunction with an electrode structure as used in scavengeless development.