Patents by Inventor Ichiro Kadota

Ichiro Kadota has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7725056
    Abstract: A developing device configured to form toner cloud without making toner particles adhere to the electrostatic transport substrate having electrodes. By applying periodical voltages to electrodes, electrically charged toner particles float on the electrostatic transport substrate. Also, a rotatable toner transporter designed to carry toner particles floating on the electrostatic transport substrate. Also, a two-component developer bearer including a sleeve with magnets on which the two-component developer is borne. The two-component developer borne on the sleeve is sent to the toner transporter by rotation of the sleeve. There, toner particles are transported to the toner transporter because of the electric bias applied between the two-component developer bearer and the toner transporter. Toner particles electrically floating on the toner transporter are sent to the photoconductor for development.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: May 25, 2010
    Assignee: Ricoh Co., Ltd.
    Inventors: Hideki Kosugi, Ichiro Kadota, Kazumi Suzuki, Takeo Tsukamoto
  • Publication number: 20100021214
    Abstract: A toner carrying member includes a plurality of electrodes arranged in a first direction intersecting with a second direction in which its surface moves. A voltage applying unit applies a bias to the electrodes such that an electric field direction is changed temporally in an alternate manner between adjacent electrodes. An adjusting member adjusts an amount of toner carried on the toner carrying member. A toner-cloud facilitating member includes a conductive member arranged between the toner supplying member and the adjusting member in the second direction in opposite to the toner carrying member.
    Type: Application
    Filed: June 1, 2009
    Publication date: January 28, 2010
    Inventors: Ichiro KADOTA, Yasuyuki ISHII, Tomoko TAKAHASHI, Masaaki YAMADA, Hideki KOSUGI, Yoshinori NAKAGAWA
  • Publication number: 20100021195
    Abstract: An apparatus and method for image fixing are disclosed. A fixing device includes a fixing member, a pressure member, a heater, and a pressure controller. The fixing member and the pressure member face with each other to form a nip. The heater heats a surface of the fixing member when the fixing member rotates. The pressure controller changes a pressure generated at the nip, according to an operation of the fixing device.
    Type: Application
    Filed: September 30, 2009
    Publication date: January 28, 2010
    Inventors: Jun YURA, Koichi Kato, Hiroshi Nakai, Kazumi Suzuki, Kei Yasutomi, Hideki Kosugi, Hirokatsu Suzuki, Ichiro Kadota
  • Publication number: 20090290901
    Abstract: A development device includes an open-ended housing, a rotatable roller, an array of multiple primary electrodes, a voltage source, a sealing member, and a secondary electrode. The housing accommodates toner for application to the photoconductive surface through an end opening thereof. The roller has an outer circumferential surface to deliver the toner from within the housing to a development zone. The array of multiple primary electrodes are aligned with each other on the roller surface. The voltage source applies a periodic pulse voltage to at least a subset of the primary electrodes to generate an oscillating primary electric field. The sealing member seals clearance between the roller surface and an edge of the end opening downstream from the development zone. The secondary electrode generates a secondary electric field to force the toner from the sealing member toward the roller surface to prevent premature removal of the toner.
    Type: Application
    Filed: May 20, 2009
    Publication date: November 26, 2009
    Inventors: Yasuyuki Ishii, Hideki Kosugi, Tomoko Takahashi, Yoshinori Nakagawa, Masaaki Yamada, Ichiro Kadota
  • Patent number: 7620336
    Abstract: An apparatus including and a method using a fixing device including a fixing member, a pressure member, a heater, and a pressure controller. The fixing member and the pressure member face with each other to form a nip. The heater heats a surface of the fixing member when the fixing member rotates. The pressure controller is configured to change a pressure generated at the nip, according to an operation of the fixing device.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: November 17, 2009
    Assignee: Ricoh Co., Ltd.
    Inventors: Jun Yura, Koichi Kato, Hiroshi Nakai, Kazumi Suzuki, Kei Yasutomi, Hideki Kosugi, Hirokatsu Suzuki, Ichiro Kadota
  • Patent number: 7613419
    Abstract: An image forming apparatus equipped with an image bearing member, a latent electrostatic image forming unit which forms a latent electrostatic image on the image bearing member, a developing unit which develops the latent electrostatic image by using a toner to form a toner image, a transfer fixing member which is roll shaped or belt shaped and bears the toner image , a heating unit which heats the toner image on the transfer fixing member; and a pressurizing member which is roll shaped and forms a transfer fixing nip with the transfer fixing member. The toner image on the transfer fixing member is transferred and fixed simultaneously to a recording medium which passes through the transfer fixing nip to record an image on the recording medium.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: November 3, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazumi Suzuki, Takashi Fujita, Hideki Kosugi, Ichiro Kadota, Atsushi Nakafuji, Hiromitsu Takagaki
  • Publication number: 20090257786
    Abstract: A developing device includes a toner carrying member and an electric-field forming unit. The electric-field forming unit forms electric fields having different characteristics at a first area of the surface of the toner carrying member located within a developing area and a second area of the surface of the toner carrying member located out of the developing area such that a hopping height of toner at the first area is higher than that at the second area.
    Type: Application
    Filed: April 13, 2009
    Publication date: October 15, 2009
    Inventors: Yoshinori NAKAGAWA, Yasuyuki ISHII, Masaaki YAMADA, Hideki KOSUGI, Tomoko TAKAHASHI, Ichiro KADOTA
  • Publication number: 20090123193
    Abstract: A development device capable of suppressing the occurrence of development defects caused by partial damage to an electrode of a toner bearing roller. The development device is provided with a first electrode layer and a second electrode layer, which are laminated so as to overlap one another in a normal direction with respect to the surface of the roller part of the toner bearing roller. A plurality of openings, which are independently arranged in a matrix in both the roller surface movement direction and an orthogonal-to-movement direction which is the direction orthogonal thereto, are provided in, of these electrode layers, the second electrode layer existing in the upper location that is closer to the roller surface, over the entire latent image bearable area of a photosensitive body in the orthogonal-to-movement direction.
    Type: Application
    Filed: October 30, 2008
    Publication date: May 14, 2009
    Inventors: Hideki KOSUGI, Yasuyuki Ishii, Tomoko Takahashi, Masaaki Yamada, Ichiro Kadota, Yoshinori Nakagawa
  • Publication number: 20090067889
    Abstract: A developing device constituted to be capable of reliably making toner flare, and carrying out developing normally in the developing area, by preventing toner from adhering to the toner carrier. A developing device having a toner carrier which is disposed in opposition to a latent image carrier and which carries toner for developing an electrostatic latent image on the latent image carrier, the developing device including: a plurality of electrodes aligned at a predetermined interval within the toner carrier; voltage application means for applying a voltage to the electrodes so that the electric field between the plurality of electrodes varies with time, wherein the electric field between the electrodes causes the toner on the toner carrier to hop and form a cloud; and a toner adhesion prevention member that is provided upstream of a developing area where the latent image carrier is in opposition to the toner carrier and that prevents adhesion of toner to the toner carrier.
    Type: Application
    Filed: September 5, 2008
    Publication date: March 12, 2009
    Inventors: Yoshinori Nakagawa, Yasuyuki Ishii, Hideki Kosugi, Tomoko Takahashi, Masaaki Yamada, Ichiro Kadota
  • Publication number: 20090067879
    Abstract: A developing device for a toner powder cloud development system, which can achieve high image quality and can be made compact. The developing device has a two-component development unit, a toner carrier, and an alternating current power source. The toner carrier, which is arranged opposing a latent image carrier, has a plurality of electrodes disposed in a line in a prescribed direction on the surface thereof, and mutually insulated. The alternating current power source supplies a voltage such that an electric field across the plurality of electrodes is temporally switched. The inter-electrode electric field causes the toner being carried on the surface of the toner carrier to carry out hopping, thereby forming a toner powder cloud and carrying out development. The movement speed of the latent image carrier and the linear velocity of the toner carrier are set at approximately equivalent speeds.
    Type: Application
    Filed: September 5, 2008
    Publication date: March 12, 2009
    Inventors: Tomoko TAKAHASHI, Yasuyuki ISHII, Hideki KOSUGI, Ichiro KADOTA, Masaaki YAMADA, Yoshinori NAKAGAWA
  • Publication number: 20090051735
    Abstract: A liquid droplet flight device is provided that moves an ink or the like using a comparatively low voltage and stably causes flight of even a high viscosity ink or the like. When causing droplets of a liquid inside a liquid retaining section to fly onto a medium transported between liquid droplet discharge means and an opposing electrode in the liquid droplet flight device, a high voltage is applied to the flight electrode from a bias power source to generate an electric field between the flight electrode and the opposing electrode. On/off control of flight control means is performed in this state to apply a drive voltage of a low voltage to an EW drive electrode from a drive power source such that the liquid inside a slit moves to a leading end portion of the flight electrode due to an electrowetting phenomenon, and the liquid that has moved to the leading end portion of the flight electrode flies toward the opposing electrode through the electric field such that a liquid droplet lands on the medium.
    Type: Application
    Filed: August 19, 2008
    Publication date: February 26, 2009
    Inventors: Hiroshi Takahashi, Ichiro Kadota, Toshihiro Kanematsu, Masaaki Yamada
  • Publication number: 20090035025
    Abstract: A disclosed developing apparatus employs a flare roller that is a toner carrier in which electrodes of two different phases are provided at fine intervals. Density irregularities or scumming in a developed image due to a potential difference between the flare roller and a latent image carrier are prevented by maintaining a constant potential on the flare roller surface. A voltage is applied to the electrodes on the flare roller such that an electric field that varies with time is generated between the electrodes, whereby a toner cloud is produced by the movement or hopping of toner over the flare roller. Thereby the toner attaches to a latent image on the latent image carrier, thus developing the latent image. In one embodiment, a bias with an average potential equal to an average potential of the bias applied to the electrodes is applied to a toner layer thickness regulating member.
    Type: Application
    Filed: June 16, 2008
    Publication date: February 5, 2009
    Inventors: Yasuyuki ISHII, Hideki Kosugi, Tomoko Takahashi, Masaaki Yamada, Ichiro Kadota, Yoshinori Nakagawa
  • Publication number: 20090022523
    Abstract: A development unit includes a toner carrying device, a regulating member, and a toner leak protection member. The toner carrying device having a first electrode and a second electrode arrayed with an interval. The first and second electrodes are supplied with a given voltage to set an electric field, changing in a time cycle, between the first and second electrodes. The electric field is used to hop toner over the toner carrying device to form a toner cloud for developing a latent image. The regulating member regulates an amount of toner on the toner carrying device. The toner leak protection member, made from a conductive material, prevents leakage of toner, and is supplied with a bias voltage.
    Type: Application
    Filed: July 18, 2008
    Publication date: January 22, 2009
    Inventors: Ichiro KADOTA, Yasuyuki Ishii, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Yoshinori Nakagawa
  • Publication number: 20080286015
    Abstract: The development device includes a toner carrier, a toner supplier, and a surface electrical potential controller. When the toner supplier supplies toner particles to the toner carrier, the toner carrier carries toner particles to adhere to a latent image formed on the latent image carrier and has a time constant ?1 of a surface electrical potential change of the toner carrier. The surface electrical potential controller has a time constant ?2 of a surface electrical potential change of the toner carrier smaller than the time constant ?1. The toner carrier includes a plurality of electrodes aligned in parallel and electrically insulated from each other on the surface thereof, and a voltage supplier for supplying each of the plurality of electrodes with a voltage to periodically switch electrical fields therebetween, so that the toner particles form a cloud on the surface of the toner carrier while hopping.
    Type: Application
    Filed: May 15, 2008
    Publication date: November 20, 2008
    Inventors: Ichiro Kadota, Yasuyuki Ishii, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Yoshinori Nakagawa, Masanori Horike, Nobuaki Kondoh
  • Patent number: 7412190
    Abstract: The present invention provides a developing apparatus and an image forming apparatus which are capable of outputting stable images with no surface staining and toner scattering even when an image forming process is repeated over a long time period, or even when image formation is performed after special use conditions in which little toner is consumed have continued over a long time period. An area in which a relationship of 0.6<Vlocal/Vaverage<0.
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: August 12, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Ichiro Kadota, Kazumi Suzuki, Hideki Kosugi, Keisuke Uchida
  • Publication number: 20080089723
    Abstract: An image formation apparatus using a hopping method is disclosed. Toner provided on a moving surface of a toner supporting object is conveyed, while the toner is hopping on the surface due to an electric field, to a position that counters a latent image supporting object by movement of the surface, and is adhered to a latent image formed on the latent image supporting object. The image formation apparatus includes a supply member for scooping up the toner in a toner container by plural hollows formed on a surface of the supply member with endless movement of the surface of the supply member, for conveying the toner to a position where the supply member contacts the toner supporting object, and for providing the toner to the surface of the toner supporting object.
    Type: Application
    Filed: October 8, 2007
    Publication date: April 17, 2008
    Inventors: Takeo Tsukamoto, Nobuaki Kondoh, Masanori Horike, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Ichiro Kadota, Yoshinori Nakagawa, Yasuyuki Ishii
  • Publication number: 20080089720
    Abstract: A development apparatus using a hopping method and an image formation apparatus including the development apparatus are disclosed. The development apparatus includes a toner supporting object for supporting and conveying a toner by a movement of the toner supporting object, while the toner is hopping on a surface of the toner supporting object by an electric field; a regulating member made of a flexible material for constituting a toner thickness regulation position; a latent image supporting object for supporting a latent image; and a development position, which is a position of the toner supporting object, that counters the latent image supporting object; wherein the toner is conveyed through the regulation position to the development position where the toner is adhered to the latent image, and wherein one end of the regulating member is supported, and the other end contacts the toner supporting object.
    Type: Application
    Filed: October 8, 2007
    Publication date: April 17, 2008
    Inventors: Takeo Tsukamoto, Nobuaki Kondoh, Masanori Horike, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Ichiro Kadota, Yoshinori Nakagawa, Yasuyuki Ishii
  • Patent number: 7313336
    Abstract: An image forming apparatus includes a plurality of color toner development devices, a recycled toner development device, at least one cleaning device, a toner collecting and supplying device, and an image pattern generation device. The plurality of color toner development devices store separate color toners, and the recycled toner development device stores recycled toner. The at least one cleaning device removes toner remaining on at least one image carrying member after a transfer operation. The toner collecting and supplying device stores and supplies the removed toner to the recycled toner development device. The image pattern generation device generates image patterns developed by the plurality of color toner development devices and the recycled toner development device based on a characteristic of developer and a color of the recycled toner stored in the recycled toner development device.
    Type: Grant
    Filed: July 15, 2005
    Date of Patent: December 25, 2007
    Assignee: Ricoh Company, Ltd.
    Inventors: Ichiro Kadota, Atsushi Shinozaki, Nekka Matsuura, Hisashi Shoji, Kazumi Suzuki, Nobutaka Takeuchi, Satoshi Muramatsu, Yukio Tabata, Motohiro Usami
  • Publication number: 20070242985
    Abstract: A disclosed development device includes: a latent image carrier; a conveying member disposed so as to face the latent image carrier, the conveying member having plural electrodes insulated from one another and arranged at predetermined intervals so as to generate an electric field for moving toner on the conveying member; a voltage application unit applying a voltage of n phases (n is a positive integer not less than one) to the electrodes so as to form a cloud of the toner and the toner is adhered to the latent image carrier so as to form a visualized toner image; a toner supply unit supplying the toner to the conveying member; and a height adjusting member adjusting a uniform height for a toner layer of the toner immediately before a development area on the conveying member in which development is performed.
    Type: Application
    Filed: April 12, 2007
    Publication date: October 18, 2007
    Inventors: Katsuhiro AOKI, Hideki Zemba, Tomoko Takahashi, Nobuaki Kondoh, Masanori Horike, Masaaki Yamada, Takeo Tsukamoto, Hideki Kosugi, Ichiro Kadota, Yoshinori Nakagawa, Yasuyuki Ishii
  • Publication number: 20070160395
    Abstract: A developing device configured to form toner cloud without making toner particles adhere to the electrostatic transport substrate having electrodes. By applying periodical voltages to electrodes, electrically charged toner particles float on the electrostatic transport substrate. Also, a rotatable toner transporter designed to carry toner particles floating on the electrostatic transport substrate. Also, a two-component developer bearer including a sleeve with magnets on which the two-component developer is borne. The two-component developer borne on the sleeve is sent to the toner transporter by rotation of the sleeve. There, toner particles are transported to the toner transporter because of the electric bias applied between the two-component developer bearer and the toner transporter. Toner particles electrically floating on the toner transporter are sent to the photoconductor for development.
    Type: Application
    Filed: January 10, 2007
    Publication date: July 12, 2007
    Inventors: Hideki Kosugi, Ichiro Kadota, Kazumi Suzuki, Takeo Tsukamoto