Patents by Inventor Yuji Kamiyama

Yuji Kamiyama 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: 8824909
    Abstract: An image forming apparatus includes a magnetic roller voltage applier for a magnetic roller, a developing roller voltage applier for a developing roller and a controller for controlling the appliers. The controller controls the magnetic roller voltage applier to apply, to the magnetic roller, a first voltage for forcibly conveying a thin layer of toner held on the developing roller toward the magnetic roller for a first period required for one turn of the developing roller, and controls the developing roller voltage applier to apply, to the developing roller, a second voltage for causing toner on the developing roller to fly onto the image carrier for a second period when at least the forcible consumption electrostatic latent image faces a facing portion between the developing roller and the magnetic roller. At least parts of the first period and the second period are overlapped with each other.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: September 2, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventor: Yuji Kamiyama
  • Publication number: 20120328313
    Abstract: An image forming apparatus includes a magnetic roller voltage applier for a magnetic roller, a developing roller voltage applier for a developing roller and a controller for controlling the appliers. The controller controls the magnetic roller voltage applier to apply, to the magnetic roller, a first voltage for forcibly conveying a thin layer of toner held on the developing roller toward the magnetic roller for a first period required for one turn of the developing roller, and controls the developing roller voltage applier to apply, to the developing roller, a second voltage for causing toner on the developing roller to fly onto the image carrier for a second period when at least the forcible consumption electrostatic latent image faces a facing portion between the developing roller and the magnetic roller. At least parts of the first period and the second period are overlapped with each other.
    Type: Application
    Filed: June 8, 2012
    Publication date: December 27, 2012
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Yuji Kamiyama
  • Patent number: 6829448
    Abstract: A method and apparatus for image forming includes a hybrid developing apparatus that supplies surly charged toner to a developing roll. The apparatus includes a developing roll that is electrically conductive at least on its surface. The image forming apparatus and the method have a constitution capable of applying an alternating current bias having a duty ratio in the range of 10 to 50% and a direct current bias superposed thereon. The developing roll is directly confronted with a latent image bearing body through an insulative toner thin layer at the nearest region of the developing roll and the latent image bearing body. An independent bias is applied to each of the developing roll and the magnetic roll, and the toner is refreshed by the varying duty ratio of the alternate current bias and the direct current bias after developing.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: December 7, 2004
    Assignee: Kyocera Corporation
    Inventors: Yoshio Ozawa, Yuji Kamiyama, Shoichi Sakata, Toshinori Nishimura
  • Publication number: 20040022549
    Abstract: In order to provide a compact, rapid and inexpensive image forming apparatus and method of the same having a hybrid developing apparatus wherein developing ghost and selective developing are avoided without complicating a developing apparatus and surly charged toner is supplied to a developing roll while stable quality images are obtained for a long time, an image forming apparatus and a method of the same which is characterized in that a developing roll is electrically conductive at least on its surface and a continuous plane of electrode to which a developing bias is applied in the direction of circumference at developing region by the surface is formed, and that the image forming apparatus and the method have a constitution capable of applying an alternate current bias having a duty ratio within the range from 10 to 50% and a direct current bias superposed thereon wherein the developing roll is directly confronted with a latent image bearing body through an insulative toner thin layer at the nearest region
    Type: Application
    Filed: March 25, 2003
    Publication date: February 5, 2004
    Inventors: Yoshio Ozawa, Yuji Kamiyama, Shoichi Sakata, Toshinori Nishimura
  • Patent number: 6616257
    Abstract: A printing head has a plurality of heater boards, each of which includes a shift register to which printing data and selection data for selecting preheating pulse signals are applied as inputs, a latch circuit for latching the printing data, a selection-data latch circuit for latching the selection data, a selection circuit for selecting any one of a plurality of preheating pulse signals inputted in accordance with the latched selection data, and a plurality of heating resistors driven by the printing data or preheating pulse signals. Correction data, obtained by a head correcting apparatus, for performing printing at an average density by correcting the characteristics of each heater board is stored in a memory of the printing head. A printing apparatus decides the selection data in accordance with the correction data and sets the selection data in the selection-data latch circuit.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: September 9, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiyuki Imanaka, Masami Ikeda, Masaaki Izumida, Yuji Kamiyama
  • Patent number: 6562537
    Abstract: An electrostatic latent image developer is provided which has an improved durability and a longer life-time by preventing the toner spent. The electrostatic latent image developer comprises a resin-coated magnetic carrier and a toner. Said resin-coated magnetic carrier consists of a magnetic ferrite carrier core and a coating layer formed thereon by polymerizing a high molecular weight polyethylene resin directly on the surface of said carrier core. Said toner does not contain polyethylene wax but polypropylene wax and/or polyester wax having an average molecular weight of 10,000 as the wax component or components in an amount of from 0.1 to 20 wt. %.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: May 13, 2003
    Assignee: Kyocera Corporation
    Inventors: Hisashi Mukataka, Yuji Kamiyama, Noriaki Sakamoto, Yoshio Ozawa
  • Patent number: 6490792
    Abstract: An ink-jet ink cartridge having an ink containing portion for containing the ink to be supplied to an ink-jet head, and a lid for covering the ink containing portion, characterized in that a wall of the ink containing portion and one face of the lid are welded together owing to frictional heat by vibration.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: December 10, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Hajime Kaneko, Yuji Kamiyama
  • Patent number: 6478416
    Abstract: A sealing method for an ink container having a front side, a rear side, a bottom side, an upper side and two lateral sides, and having an ink supply port for supplying ink to a recording head portion and an air vent for fluid communication between an inside of the ink container and ambience. A seal member is mounted on a first one of the sides and on a second one of the sides continuous with the first side, the seal member having a width larger than a width of the first and second sides. A portion of the seal member is inwardly folded beyond the width of the first side. A portion of the seal member is outwardly folded beyond the width of the second side. The inwardly folded portion of the seal member is heat-sealed to a side of a packaging bladder for accommodating the ink container.
    Type: Grant
    Filed: July 13, 2001
    Date of Patent: November 12, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Hajime Kaneko, Masahiko Higuma, Yuji Kamiyama, Yoichi Taneya
  • Patent number: 6471339
    Abstract: This invention has as its object to provide a substrate for an ink jet recording head, which is compact and can realize stable recording with high reliability, a recording head using the substrate, a recording apparatus mounting the recording head, and a method of driving the recording head. There are disclosed a substrate for a thermal recording head, having a plurality of heating resistor elements, a plurality of wiring electrodes for supplying driving signals to the heating resistor elements, a function element, electrically connected to the heating resistor elements, for selectively driving the plurality of heating resistor elements, and a measurement resistor element which is electrically independent form the heating resistor elements and the function element, and haws a resistance value larger than that of each heating resistor element, an ink jet head, a head cartridge, and a recording apparatus utilizing the substrate, and a method of driving a recording head using a measurement resistor.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: October 29, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuji Kamiyama, Fumio Murooka, Tatsuo Furukawa, Shuichi Katao, Yoshiyuki Imanaka, Hiroyuki Maru, Masaaki Izumida
  • Patent number: 6439690
    Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.
    Type: Grant
    Filed: June 20, 2001
    Date of Patent: August 27, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Junji Shimoda, Masami Kasamoto, Fumio Murooka, Tatsuo Furukawa, Jun Kawai, Hiroyuki Maru, Teruo Arashima, Masaaki Izumida, Yoshinori Misumi, Yuji Kamiyama
  • Patent number: 6428154
    Abstract: An ink cartridge for ink jet use is provided with an aperture for filling in the cartridge with ink. The circumference of the aperture and a part of a plug pressed in the aperture are fused and welded to be formed integrally to airtightly close the aperture, and obtain an integrated structure without any interface. Hence, it is made possible to reliably prevent ink from leaking therefrom, even if some scratches and cracks are present on both of them. This contributes to eliminating inspection steps to find ink leakage in the course of manufacture, and also, contributes to improving the yield of production. As a result, a significant reduction of costs is possible, while enhancing the reliability of the ink cartridge.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: August 6, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuji Kamiyama, Kazuaki Masuda, Hajime Kaneko, Hiroaki Tanaka, Hiroyuki Ishinaga
  • Patent number: 6409300
    Abstract: A printing head has a plurality of heater boards, each of which includes a shift register to which printing data and selection data for selecting preheating pulse signals are applied as inputs, a latch circuit for latching the printing data, a selection-data latch circuit for latching the selection data, a selection circuit for selecting any one of a plurality of preheating pulse signals inputted in accordance with the latched selection data, and a plurality of heating resistors driven by the printing data or preheating pulse signals. Correction data, obtained by a head correcting apparatus, for performing printing at an average density by correcting the characteristics of each heater board is stored in a memory of the printing head. A printing apparatus decides the selection data in accordance with the correction data and sets the selection data in the selection-data latch circuit.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: June 25, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiyuki Imanaka, Masaki Inaba, Masami Ikeda, Yutaka Koizumi, Tsuyoshi Orikasa, Tatsuo Furukawa, Toshio Kashino, Hideaki Kishida, Seiichiro Karita, Shuji Koyama, Haruhiko Terai, Kimiyuki Hayasaki, Shuichi Katao, Akira Goto, Kouichi Omata, Hiroyuki Maru, Masaaki Izumida, Yuji Kamiyama, Takayuki Ono
  • Patent number: 6382772
    Abstract: An ink jet head includes ink ejection outlet for ejecting ink, a plurality of heat generating resistors for generating thermal energy contributable to ejecting the ink, and ink flow path comprising the plurality of the heat generating resistors and being in fluid communication with the ejection outlet, the heat generating resistors generating the thermal energy upon receiving a driving signal, so that a bubble is generated in the ink within the ink flow path to eject the ink through the ink ejection outlet; wherein the plurality of the heat generating resistors are arranged in parallel, relative to the ink ejecting direction, in the ink flow path, and the distances from the heat generating centers of the heat generating resistors to the ejection outlet are different.
    Type: Grant
    Filed: August 26, 1999
    Date of Patent: May 7, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuji Kamiyama, Hiroyuki Ishinaga, Yoshiyuki Imanaka, Masaaki Izumida
  • Patent number: 6381437
    Abstract: Disclosed is an image formation method using electrophotography, comprising the steps of supplying a developer by a developing device (17) onto a photosensitive drum (11) in rotation to form a toner image thereon, transferring the formed toner image onto a transfer paper to form an image on the transfer paper, and removing untransferred developer by use of a cleaning blade (21), wherein an OPC photosensitive drum (11) is used for the photosensitive drum and includes a photosensitive layer (27) being formed on an electrically conductive base (25) and having an initial thickness which is a value within a range of 20 to 50 &mgr;m, and wherein the amount X of reduction in the thickness of the photosensitive layer (27) in the OPC photosensitive drum (11) satisfies the following expression (1) 0.5 &mgr;m<30X/R<1.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: April 30, 2002
    Assignee: Kyocera Corporation
    Inventors: Yoshio Ozawa, Hisashi Mukataka, Yojiro Sato, Yuji Kamiyama, Motoki Moriguchi
  • Publication number: 20020047873
    Abstract: A printing head has a plurality of heater boards, each of which includes a shift register to which printing data and selection data for selecting preheating pulse signals are applied as inputs, a latch circuit for latching the printing data, a selection-data latch circuit for latching the selection data, a selection circuit for selecting any one of a plurality of preheating pulse signals inputted in accordance with the latched selection data, and a plurality of heating resistors driven by the printing data or preheating pulse signals. Correction data, obtained by a head correcting apparatus, for performing printing at an average density by correcting the characteristics of each heater board is stored in a memory of the printing head. A printing apparatus decides the selection data in accordance with the correction data and sets the selection data in the selection-data latch circuit.
    Type: Application
    Filed: December 4, 2001
    Publication date: April 25, 2002
    Inventors: Yoshiyuki Imanaka, Masaki Inaba, Masami Ikeda, Yutaka Koizumi, Tsuyoshi Orikasa, Tatsuo Furukawa, Toshio Kashino, Hideaki Kishida, Seiichiro Karita, Shuji Koyama, Haruhiko Terai, Kimiyuki Hayasaki, Shuichi Katao, Akira Goto, Kouichi Omata, Hiroyuki Maru, Masaaki Izumida, Yuji Kamiyama, Takayuki Ono
  • Patent number: 6336719
    Abstract: An ink-jet ink cartridge having an ink containing portion for containing the ink to be supplied to an ink-jet head, and a lid for covering the ink containing portion, characterized in that a wall of the ink containing portion and one face of the lid are welded together owing to frictional heat by vibration.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: January 8, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Hajime Kaneko, Yuji Kamiyama
  • Publication number: 20020001008
    Abstract: A printing head has a plurality of heater boards, each of which includes a shift register to which printing data and selection data for selecting preheating pulse signals are applied as inputs, a latch circuit for latching the printing data, a selection-data latch circuit for latching the selection data, a selection circuit for selecting any one of a plurality of preheating pulse signals inputted in accordance with the latched selection data, and a plurality of heating resistors driven by the printing data or preheating pulse signals. Correction data, obtained by a head correcting apparatus, for performing printing at an average density by correcting the characteristics of each heater board is stored in a memory of the printing head. A printing apparatus decides the selection data in accordance with the correction data and sets the selection data in the selection-data latch circuit.
    Type: Application
    Filed: June 16, 1999
    Publication date: January 3, 2002
    Inventors: YOSHIYUKI IMANAKA, MASAKI INABA, MASAMI IKEDA, YUTAKA KOIZUMI, TSUYOSHI ORIKASA, TATSUO FURUKAWA, TOSHIO KASHINO, HIDEAKI KISHIDA, SEIICHIRO KARITA, SHUJI KOYAMA, HARUHIKO TERAI, KIMIYUKI HAYASAKI, SHUICHI KATAO, AKIRA GOTO, KOUICHI OMATA, HIROYUKI MARU, MASAAKI IZUMIDA, YUJI KAMIYAMA, TAKAYUKI ONO
  • Patent number: 6332674
    Abstract: An ink cartridge for ink jet use is provided with an aperture for filling in the cartridge with ink. The circumference of the aperture and a part of a plug pressed in the aperture are fused and welded to be formed integrally to airtightly close the aperture, and obtain an integrated structure without any interface. Hence, it is made possible to reliably prevent ink from leaking therefrom, even if some scratches and cracks are present on both of them. This contributes to eliminating inspection steps to find ink leakage in the course of manufacture, and also, contributes to improving the yield of production. As a result, a significant reduction of costs is possible, while enhancing the reliability of the ink cartridge.
    Type: Grant
    Filed: February 11, 1998
    Date of Patent: December 25, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuji Kamiyama, Kazuaki Masuda, Hajime Kaneko, Hiroaki Tanaka, Hiroyuki Ishinaga
  • Publication number: 20010040614
    Abstract: An ink container includes an ink absorbing material accommodating chamber for accommodating an ink absorbing material for retaining ink to be supplied to a recording head; an ink supply opening connectable with said recording head to supply the ink to the recording head from said accommodating chamber; an air vent portion for fluid communication between said accommodating chamber with ambience; wherein said air vent portion has an inside opening in fluid communication with an inside of said accommodating chamber, an outside opening open to the ambience, and a fluid communication path in fluid communication with said inside opening and outside opening; wherein said outside opening takes, when said container is mounted on an apparatus with which it is usable, a position lower than that taken by said inside opening.
    Type: Application
    Filed: July 13, 2001
    Publication date: November 15, 2001
    Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Hajime Kaneko, Masahiko Higuma, Yuji Kamiyama, Yoichi Taneya
  • Publication number: 20010033304
    Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.
    Type: Application
    Filed: June 20, 2001
    Publication date: October 25, 2001
    Inventors: Hiroyuki Ishinaga, Kazuaki Masuda, Junji Shimoda, Masami Kasamoto, Fumio Murooka, Tatsuo Furukawa, Jun Kawai, Hiroyuki Maru, Teruo Arashima, Masaaki Izumida, Yoshinori Misumi, Yuji Kamiyama