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| Number | Title | Issue Date |
| 8190071 | Developing device forming toner layer by magnetic brush and image forming apparatus using same The surface of a developing roller is coated with a phenol resin layer at a higher level in triboelectric series than a toner. A positively charged toner supplied from a magnetic roller onto the developing roller is negatively charged by friction with the phenol res... | 05/29/2012 |
| 8155570 | Developing device and image forming apparatus with the same A first bias Vslv is applied to a development roller 22 and a second bias Vmag is applied to a magnetic roller 23 to perform development; after completion of development, without changing the setting of Vslv, of the AC component Vpp2 of Vmag, the peak ... | 04/10/2012 |
| 8126378 | Developing device and image forming apparatus with a toner separation member that uses a bias voltage to pull away toner in a developer Provided are a developing device and an image forming apparatus which employ a hybrid development method, have a toner-collecting developer supporting member and keep toner collecting ability stable for a long period of time to form high-quality images without devel... | 02/28/2012 |
| 8059995 | Image forming apparatus including a developer bearing member with an alternate electric field being applied thereto An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, a... | 11/15/2011 |
| 8050602 | Developing device and image forming apparatus equipped with the same A developing device includes: a developer containing a toner and a carrier; a first transporting member placed at an opening portion of a developer vessel used for housing the developer; a second transporting member that faces the first transporting member with a fi... | 11/01/2011 |
| 7979011 | Image forming apparatus having a photoconductive drum An image forming apparatus that includes: a photoconductive drum; a developing roller that is arranged opposite the photoconductive drum and that carries toner; a detecting portion that detects an occurrence of electrical discharge between the developing roller and ... | 07/12/2011 |
| 7962073 | Image forming apparatus with developing unit having a magnetic brush An image forming apparatus having an image carrier for forming an electrostatic latent image and a developing unit for developing the electrostatic latent image with a two-component developing agent, the developing unit includes: a developing agent carrier for devel... | 06/14/2011 |
| 7941080 | Image forming apparatus An image forming apparatus is provided with a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image formed on the photoconductive member by a first bias, and a magnetic roller for forming a magnetic brush... | 05/10/2011 |
| 7890029 | Image forming apparatus There is provided an image forming apparatus capable of realizing improvement of an image density by improving dot reproducibility and reducing fog at the same time. An alternating voltage is applied to a development sleeve so that a first period during which a firs... | 02/15/2011 |
| 7835676 | Developing apparatus image forming apparatus, and method of charging a developer using charging particles A developing apparatus for visualizing an electrostatic latent image on an electrostatic latent image bearing member by using a developer including toner and carrier particles, has a developer including toner and carrier particles, a first transport member, a second... | 11/16/2010 |
| 7826781 | Image forming apparatus with controlled application of alternating-current bias An image forming apparatus has a photoconductive member, and a developing roller develops a latent image on the photoconductive member by a first alternating-current bias in the form of a rectangular wave. The following relationships are satisfied in calculating the... | 11/02/2010 |
| 7764910 | Image forming apparatus An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, a... | 07/27/2010 |
| 7742727 | Image forming apparatus An image forming apparatus has a photoconductive member on which a latent image is to be formed, a developing roller for developing the latent image on the photoconductive member by a first bias. A magnetic roller forms a magnetic brush thereon with a two-component ... | 06/22/2010 |
| 7613417 | Image forming apparatus An image forming apparatus uses a two-component developer containing a toner and a carrier. The apparatus has a latent image bearer for bearing an electrostatic latent image. A toner bearer bears the toner to be conveyed to a development region to develop the electr... | 11/03/2009 |
| 7474867 | Magnetic carrier, two-component developer, development method, development device and image forming apparatus of electrophotography A two-component developer including toner and magnetic carriers is provided. The two-component developer is characterized in that when a development device including a developer bearing member bearing the two-component developer is operated under a development condi... | 01/06/2009 |
| 7440718 | Developing apparatus featuring image defect supression A developing apparatus having a developing sleeve provided with an elastic layer on its surface, and for developing an electrostatic image formed on an image bearing member with a mono-component magnetic toner having a mean degree of circularity of 0.965 or greater,... | 10/21/2008 |
| 7418215 | Developing device with toner and magnetic carrier, and image forming apparatus using the developing device A developing device includes a developing housing which faces an image carrier on which an electrostatic latent image is carried and stores a developer which contains toner and magnetic carrier; a developer carrier that is disposed apart from the image carrier in th... | 08/26/2008 |
| 7383003 | Developing apparatus for preventing ghost images and uneven image density A developing apparatus includes a developing roller for developing an image with a developer; a non-rotary magnet roll inside the roller; a blade; and an abutting member abutting against the roller, wherein the following expressions are satisfied: |Vs|>|Vdev|, |Br|/... | 06/03/2008 |
| 7362991 | Image forming apparatus An image forming apparatus having a photosensitive drum bearing an electrostatic image, and a developing sleeve carrying a developer for developing the electrostatic image, the developing sleeve is in non-contact with the photosensitive drum, and is designed to be f... | 04/22/2008 |
| 7343122 | Image forming apparatus for preventing worm-shaped image irregularities There is described an image forming apparatus, which prevents an occurrence of worm-shaped image irregularities even in the high-speed developing operation to form a high quality image. In the image forming apparatus, the contact developing employing a two component... | 03/11/2008 |
| 7340203 | Method and device for cleaning support elements in printers or copiers by means of magnetic fields The invention relates to a method and devices for cleaning the surfaces of applicator rollers, photoconductor drums, transfer belts, and photoconductor belts using magnetic roller systems. The invention also relates to methods and systems for cleaning magnetic rolle... | 03/04/2008 |
| 7330684 | Developing device, image forming apparatus, image forming system, charging member, and method for manufacturing developing device A developing device that can suppress occurrence of fogging is achieved. The developing device is provided with: a developer bearing member for bearing a developer; and a charging member for charging the developer borne by the developer bearing member. The charging ... | 02/12/2008 |
| 7315703 | Image forming apparatus, image forming system, and image forming method An image forming apparatus includes an image bearing body and a developer bearing body. A transferring section transfers, onto a medium, a developer image formed on the image bearing body by development of the latent image. A voltage applying section alternately app... | 01/01/2008 |
| 7315711 | Image forming apparatus, process cartridge and cleaningless system An image forming apparatus of includes a developing device bifunctioning as a cleaning device for collecting toner grains left on a photoconductive drum after the transfer of a toner image from the drum to a paper sheet or similar image transfer medium. In the event... | 01/01/2008 |
| 7310490 | Developing unit for an image forming apparatus A developing unit for an image forming apparatus using a two-property developer that induces a magnetic attraction force based on the slope of a curved line representing the magnetism of each magnetic pole of a magnetic field generating part of a developing roller a... | 12/18/2007 |
| 7305196 | Apparatus for and method of controlling high voltage in image forming apparatus An apparatus for and a method of controlling a high voltage in an image forming apparatus using the high voltage with a high alternating current voltage superimposed on a high direct current voltage. The apparatus includes: a high alternating current voltage output ... | 12/04/2007 |
| 7260347 | Image forming apparatus A developing apparatus having: a first developer carrying member close to a developer regulating member for regulating an amount of developer; a second developer carrying member to which the developer is delivered from the first developer carrying member; and a mode... | 08/21/2007 |
| 7251441 | Developing apparatus including magnetic field generating means, for use with a developer which includes a magnetic toner component A developing apparatus includes a developer carrying member for carrying a developer including one component magnetic toner to develop an electrostatic image formed on an image bearing member. The developer carrying member includes an elastic member contactable to t... | 07/31/2007 |
| 7239831 | Image forming apparatus when a maximum developing bias voltage |V| max and surface potential Vd of a charged image bearing member satisfy: |V| max≦|Vd| An image forming apparatus includes an image bearing member; a charging device for electrically charging the image bearing member; a rotatable developer carrying member for carrying a developer to develop an electrostatic image formed on the image bearing member wit... | 07/03/2007 |
| 7174119 | Developing device featuring high viscosity developing agent and superimposed AC and DC bias voltage components A developing device for developing an electrostatic image formed on an image carrier, includes a liquid developing agent, wherein toner particles are dispersed in a liquid solvent, and wherein a viscosity of the liquid developing agent is in a range 100 mPa·s to 10... | 02/06/2007 |
| 7155150 | Method and apparatus for developing a latent image using toner grains constituting a developer A method of developing a latent image formed on a surface of an image carrier with toner grains, which constitute a developer together with magnetic carrier grains for supporting the toner grains, by depositing the developer on a developer carrier, which faces the i... | 12/26/2006 |
| 7151238 | Thermal development apparatus and thermal development process A thermal development apparatus for thermally developing a thermal developable recording material in a thermal development section, the thermal developable recording material having a latent image formed in advance, wherein the the... | 12/19/2006 |
| 7139517 | Developing method for an image forming apparatus and developing device using the same A developing method of the present invention develops a latent image formed on an image carrier with a two-ingredient type developer, which consists of toner grains and carrier grains retaining the toner grains thereon, deposited on a developer carrier in the form o... | 11/21/2006 |
| 7136599 | Developing apparatus, image forming apparatus, and developing method It is intended to provide a developing apparatus, an image forming apparatus and developing method capable of managing both decrease of load on apparatuses and improvement of image quality in case development of an image is made by applying contact developing and AC... | 11/14/2006 |
| 7116933 | Developing unit, image forming apparatus, and developing method A developing unit is adapted to an image forming apparatus of an electrophotographic system that has a two component developing agent. The developing unit deposits a thin layer of toner on a developing roller by way of a magnetic brush on a magnetic roller. The tone... | 10/03/2006 |
| 7110710 | Toner for electrophotography, developer using the same, image-forming process cartridge using the same, image-forming apparatus using the same and image-forming process using the same The toner of the present invention is suitably used in SLIC development system where a liner velocity of a developer-bearing member is 150 to 500 cm/sec. The toner has resin particles containing at least a coloring agent, and a charge controlling agent fine articles... | 09/19/2006 |
| 7099609 | Developing device A developing apparatus includes a developing container for containing a developer comprising toner and a carrier, said developing container is partitioned into a first chamber and a second chamber constituting a circulation path of the developer; a first developing ... | 08/29/2006 |
| 7074292 | Processes for manufacturing blade member of developer quantity control blade A blade member manufacturing process using no mold and a developer quantity control blade manufacturing process using this blade member are disclosed in which a material for the blade member is extruded onto a charge control face face-transferring sheet in a uniform... | 07/11/2006 |
| 7058334 | Electro-photographic image forming apparatus having a function for preventing toner for scattering and control method for the same An electro-photographic image forming apparatus preventing toner from scattering during a printing operation and a control method of the same. The electro-photographic image forming apparatus includes a scattering preventive member being disposed downstream of the d... | 06/06/2006 |
| 7050733 | Image forming apparatus including two developer carrying members wherein potential differences between the developer carrying members and a common voltage source differ An image forming apparatus includes a plurality of developing devices each including a developer carrying member for carrying a developer to develop an electrostatic latent image formed on an image bearing member, and a developer regulating member for regulating the... | 05/23/2006 |
