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: 8483598
    Abstract: The image forming apparatus includes a latent image bearing member; a charging device charging the surface of the latent image bearing member; a latent image forming device forming an electrostatic latent image on the surface of the latent image bearing member; a developing device supplying toner to the electrostatic latent image to form a toner image; a cover film supplying device supplying a cover film to the surface of the latent image bearing member at a cover film supplying position located on an upstream side from the development position so that the toner image is formed on the cover film covering the surface of the latent image bearing member; and a cover film separating device separating the cover film bearing the toner image thereon from the surface of the image bearing member before the cover film bearing the toner image thereon reaches the cover film supplying position.
    Type: Grant
    Filed: April 12, 2010
    Date of Patent: July 9, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Shigekazu Enoki, Takuya Suganuma, Ryuji Yoshida, Yoshinori Nakagawa, Atsushi Kurokawa, Ichiro Kadota, Naoyuki Ozaki, Hiroki Atari, Hiroyuki Sugiyama, Kazuhisa Sudo, Masanori Kawasumi, Hiroshi Nakai, Shin Kayahara, Shuji Tanaka
  • Publication number: 20130129391
    Abstract: A toner container and an image forming apparatus are disclosed. The toner container includes a guiding member formed at a part surrounding a toner outlet to be protruded from a circumferential surface of the toner container for guiding an opening or closing operation of a shutter member in a circumferential direction of the toner container. The image forming apparatus includes an image forming apparatus main body. The image forming apparatus main body includes a main body side shutter for opening or closing a toner supplying opening to be connected to the toner outlet. When the shutter member is opened, an end surface of the guiding member pushes the main body side shutter together with the opening operation of the shutter member, and the toner supplying opening is opened and is connected to the toner outlet.
    Type: Application
    Filed: December 19, 2012
    Publication date: May 23, 2013
    Inventors: Ichiro Kadota, Kunihiro Ohyama, Masayuki Yamane, Takeshi Uchitani, Nobuyuki Taguchi, Satoru Yoshida, Takuya Seshita
  • Patent number: 8391755
    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: Grant
    Filed: September 5, 2008
    Date of Patent: March 5, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshinori Nakagawa, Yasuyuki Ishii, Hideki Kosugi, Tomoko Takahashi, Masaaki Yamada, Ichiro Kadota
  • Patent number: 8373732
    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: Grant
    Filed: August 19, 2008
    Date of Patent: February 12, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Takahashi, Ichiro Kadota, Toshihiro Kanematsu, Masaaki Yamada
  • Patent number: 8369738
    Abstract: A toner container and an image forming apparatus are disclosed. The toner container includes a guiding member formed at a part surrounding a toner outlet to be protruded from a circumferential surface of the toner container for guiding an opening or closing operation of a shutter member in a circumferential direction of the toner container. The image forming apparatus includes an image forming apparatus main body. The image forming apparatus main body includes a main body side shutter for opening or closing a toner supplying opening to be connected to the toner outlet. When the shutter member is opened, an end surface of the guiding member pushes the main body side shutter together with the opening operation of the shutter member, and the toner supplying opening is opened and is connected to the toner outlet.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: February 5, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Ichiro Kadota, Kunihiro Ohyama, Masayuki Yamane, Takeshi Uchitani, Nobuyuki Taguchi, Satoru Yoshida, Takuya Seshita
  • Patent number: 8355657
    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: Grant
    Filed: July 18, 2008
    Date of Patent: January 15, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Ichiro Kadota, Yasuyuki Ishii, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Yoshinori Nakagawa
  • Patent number: 8165510
    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: Grant
    Filed: May 15, 2008
    Date of Patent: April 24, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Ichiro Kadota, Yasuyuki Ishii, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Yoshinori Nakagawa, Masanori Horike, Nobuaki Kondoh
  • Patent number: 8126346
    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: Grant
    Filed: September 30, 2009
    Date of Patent: February 28, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Yura, Koichi Kato, Hiroshi Nakai, Kazumi Suzuki, Kei Yasutomi, Hideki Kosugi, Hirokatsu Suzuki, Ichiro Kadota
  • Patent number: 8073350
    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: Grant
    Filed: June 16, 2008
    Date of Patent: December 6, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuyuki Ishii, Hideki Kosugi, Tomoko Takahashi, Masaaki Yamada, Ichiro Kadota, Yoshinori Nakagawa
  • Patent number: 8041267
    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: Grant
    Filed: April 13, 2009
    Date of Patent: October 18, 2011
    Assignee: Ricoh Company, Limited
    Inventors: Yoshinori Nakagawa, Yasuyuki Ishii, Masaaki Yamada, Hideki Kosugi, Tomoko Takahashi, Ichiro Kadota
  • Patent number: 8005409
    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: Grant
    Filed: May 20, 2009
    Date of Patent: August 23, 2011
    Assignee: Ricoh Company Limited
    Inventors: Yasuyuki Ishii, Hideki Kosugi, Tomoko Takahashi, Yoshinori Nakagawa, Masaaki Yamada, Ichiro Kadota
  • Publication number: 20110176820
    Abstract: A development device includes a toner-containing chamber for containing supplied toner having an interior wall, a developer-containing chamber for containing developer including toner and carrier communicating with the toner-containing chamber; and a transport screw to transport the supplied toner from the toner-containing chamber to the developer-containing chamber, disposed in the toner-containing chamber so that there is no gap between the outer edge of the transport screw and the interior wall of the toner-containing chamber in a portion lower than a level of the supplied toner in the toner-containing chamber.
    Type: Application
    Filed: December 30, 2010
    Publication date: July 21, 2011
    Inventors: Ichiro KADOTA, Kunihiro Ohyama, Masayuki Yamane, Takeshi Uchitani, Satoru Yoshida, Takuya Seshita
  • Patent number: 7920812
    Abstract: A development device 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 are provided in the second electrode layer, over the entire latent image bearable area of a photosensitive body in the orthogonal-to-movement direction. The toner on the surface of the roller part is caused to hop between a plurality of spots directly beneath the openings that respectively exist directly beneath the plurality of openings in the second electrode layer, and a plurality of spots between the openings that respectively exist between the plurality of openings in the second electrode layer, within the entire area of the first electrode layer which is uniformly formed in the roller circumferential direction.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: April 5, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Kosugi, Yasuyuki Ishii, Tomoko Takahashi, Masaaki Yamada, Ichiro Kadota, Yoshinori Nakagawa
  • Patent number: 7912410
    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: Grant
    Filed: September 5, 2008
    Date of Patent: March 22, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoko Takahashi, Yasuyuki Ishii, Hideki Kosugi, Ichiro Kadota, Masaaki Yamada, Yoshinori Nakagawa
  • Patent number: 7907856
    Abstract: An apparatus for developing a latent image on a latent image carrier includes a toner carrier and multiple electrodes arranged at intervals on a surface of the toner carrier. A potential difference is formed between even-numbered electrodes and odd-numbered electrodes of the electrodes by applying a first pulse voltage to the even-numbered electrodes and a second pulse voltage to the odd-numbered electrodes so that toner on the surface of the toner carrier moves back and forth between the electrodes, where the first and second pulse voltages are in different phases, and the toner moving back and forth between the electrodes is conveyed to a position facing the latent image carrier by movement of the surface of the toner carrier and thereby caused to adhere to the latent image on the latent image carrier.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: March 15, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeo Tsukamoto, Nobuaki Kondoh, Masanori Horike, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Ichiro Kadota, Yoshinori Nakagawa, Yasuyuki Ishii
  • Publication number: 20100278558
    Abstract: The image forming apparatus includes a latent image bearing member; a charging device charging the surface of the latent image bearing member; a latent image forming device forming an electrostatic latent image on the surface of the latent image bearing member; a developing device supplying toner to the electrostatic latent image to form a toner image; a cover film supplying device supplying a cover film to the surface of the latent image bearing member at a cover film supplying position located on an upstream side from the development position so that the toner image is formed on the cover film covering the surface of the latent image bearing member; and a cover film separating device separating the cover film bearing the toner image thereon from the surface of the image bearing member before the cover film bearing the toner image thereon reaches the cover film supplying position.
    Type: Application
    Filed: April 12, 2010
    Publication date: November 4, 2010
    Inventors: Shigekazu ENOKI, Takuya Suganuma, Ryuji Yoshida, Yoshinori Nakagawa, Atsushi Kurokawa, Ichiro Kadota, Naoyuki Ozaki, Hiroki Atari, Hiroyuki Sugiyama, Kazuhisa Sudo, Masanori Kawasumi, Hiroshi Nakai, Shin Kayahara, Shuji Tanaka
  • Publication number: 20100226690
    Abstract: A toner container and an image forming apparatus are disclosed. The toner container includes a guiding member formed at a part surrounding a toner outlet to be protruded from a circumferential surface of the toner container for guiding an opening or closing operation of a shutter member in a circumferential direction of the toner container. The image forming apparatus includes an image forming apparatus main body. The image forming apparatus main body includes a main body side shutter for opening or closing a toner supplying opening to be connected to the toner outlet. When the shutter member is opened, an end surface of the guiding member pushes the main body side shutter together with the opening operation of the shutter member, and the toner supplying opening is opened and is connected to the toner outlet.
    Type: Application
    Filed: August 4, 2009
    Publication date: September 9, 2010
    Inventors: Ichiro Kadota, Kunihiro Ohyama, Masayuki Yamane, Takeshi Uchitani, Nobuyuki Taguchi, Satoru Yoshida, Takuya Seshita
  • Patent number: 7783235
    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: Grant
    Filed: October 8, 2007
    Date of Patent: August 24, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeo Tsukamoto, Nobuaki Kondoh, Masanori Horike, Tomoko Takahashi, Masaaki Yamada, Hideki Kosugi, Ichiro Kadota, Yoshinori Nakagawa, Yasuyuki Ishii
  • Patent number: 7734233
    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: Grant
    Filed: April 12, 2007
    Date of Patent: June 8, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Katsuhiro Aoki, Hideki Zemba, Tomoko Takahashi, Nobuaki Kondoh, Masanori Horike, Masaaki Yamada, Takeo Tsukamoto, Hideki Kosugi, Ichiro Kadota, Yoshinori Nakagawa, Yasuyuki Ishii
  • Patent number: 7724394
    Abstract: An image forming apparatus includes a pseudo half tone processing unit that performs a pseudo half tone process on input image data to generate output image data. An exposure unit executes light modulation of a plurality of light emitting sources based on the output image data. The exposure unit performs writing in such a way that different numbers of light emitting sources are used when writing a character/line image and a picture image or a graphics image. The pseudo half tone processing unit performs pseudo half tone processes with different resolutions on a character/line image and a picture image or a graphics image based on the numbers of the light emitting sources to be used for the writing by the exposure unit.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: May 25, 2010
    Assignee: Ricoh Company, Limited
    Inventors: Kei Yasutomi, Jun Yura, Hideki Kosugi, Hirokatsu Suzuki, Kohichi Katoh, Hiroshi Nakai, Ichiro Kadota, Kazumi Suzuki