Patents by Inventor Taku Kumiya

Taku Kumiya 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: 10599064
    Abstract: A powder-amount detection device includes a first electrode, a second electrode, a third electrode and a voltage detector with the second electrode adjacent to the first electrode on the powder container and have a smaller surface area than a surface area of the first electrode. The third electrode is on a side opposite to the second electrode with the powder container interposed between the third electrode and each of the first electrode and the second electrode. The voltage detector detects voltages of the first electrode and the second electrode by detecting charging and discharging behaviors of the first electrode and the second electrode when a voltage is applied between the third electrode and each of the first electrode and the second electrode for a short time, and detects the amount of powder in the powder container based on the voltages of the first electrode and the second electrode.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: March 24, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahide Yamashita, Taku Kumiya, Yohei Kushida, Takuya Murata, Keita Maejima
  • Patent number: 10429770
    Abstract: A powder-amount detection device includes an outer electrode, an inner electrode, and a detector. The outer electrode is disposed outside a powder container to be replaceably installed to an image forming apparatus. The inner electrode is disposed inside a powder supply port of the powder container. The detector is configured to apply an electric field between the outer electrode and the inner electrode to detect a capacitance between the outer electrode and the inner electrode.
    Type: Grant
    Filed: June 4, 2018
    Date of Patent: October 1, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Taku Kumiya, Masahide Yamashita, Yohei Kushida, Takuya Murata, Keita Maejima
  • Patent number: 10365601
    Abstract: An image forming apparatus includes an image forming device, an image density detector, and a processor. The processor controls the image forming device to form a first test toner image, and controls the image density detector to detect an image density at the plurality of positions of the first test toner image. The processor adjusts an image forming condition so that the image density detected at each of the plurality of positions becomes a target image density, controls the image forming device to form a second test toner image based on the adjusted image forming condition, controls the image density detector to detect an image density at the plurality of positions of the second test toner image, determines whether a streak exists in the second test toner image based on the detected image densities, and executes a countermeasure to prevent an occurrence of the streak.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: July 30, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Keita Sone, Akira Yoshida, Natsumi Matsue, Kazuaki Kamihara, Yuuichiroh Uematsu, Kohei Matsumoto, Taku Kumiya
  • Publication number: 20180348673
    Abstract: A powder-amount detection device includes an outer electrode, an inner electrode, and a detector. The outer electrode is disposed outside a powder container to be replaceably installed to an image forming apparatus. The inner electrode is disposed inside a powder supply port of the powder container. The detector is configured to apply an electric field between the outer electrode and the inner electrode to detect a capacitance between the outer electrode and the inner electrode.
    Type: Application
    Filed: June 4, 2018
    Publication date: December 6, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Taku KUMIYA, Masahide YAMASHITA, Yohei KUSHIDA, Takuya MURATA, Keita MAEJIMA
  • Publication number: 20180341199
    Abstract: A powder-amount detection device includes a first electrode disposed on one side of a powder container to be replaceably installed to an image forming apparatus; a second electrode disposed adjacent to the first electrode and having a smaller surface area than the first electrode, an influence of an amount of powder in the powder container to a capacitance of the second electrode being as small as negligible; a third electrode disposed on a side opposite to the second electrode with the powder container interposed between the third electrode and each of the first electrode and the second electrode; and a voltage detector configured to detect charging and discharging behaviors of the first electrode and the second electrode when a voltage is applied between the third electrode and each of the first electrode and the second electrode for a short time, to detect the amount of powder in the powder container.
    Type: Application
    Filed: May 21, 2018
    Publication date: November 29, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Masahide YAMASHITA, Taku KUMIYA, Yohei KUSHIDA, Takuya MURATA, Keita MAEJIMA
  • Publication number: 20180150010
    Abstract: An image forming apparatus includes an image forming device, an image density detector, and a processor. The processor controls the image forming device to form a first test toner image, and controls the image density detector to detect an image density at the plurality of positions of the first test toner image. The processor adjusts an image forming condition so that the image density detected at each of the plurality of positions becomes a target image density, controls the image forming device to form a second test toner image based on the adjusted image forming condition, controls the image density detector to detect an image density at the plurality of positions of the second test toner image, determines whether a streak exists in the second test toner image based on the detected image densities, and executes a countermeasure to prevent an occurrence of the streak.
    Type: Application
    Filed: October 25, 2017
    Publication date: May 31, 2018
    Inventors: Keita SONE, Akira Yoshida, Natsumi Matsue, Kazuaki Kamihara, Yuuichiroh Uematsu, Kohei Matsumoto, Taku Kumiya