Patents by Inventor Koh TOKUMARU

Koh TOKUMARU 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).

  • Fixing control device, fixing control method, and image forming apparatus
    Patent number: 9116479
    Abstract: A fixing control device includes an image detection unit that determines presence of an image in each of areas obtained by division of an image formation region in which the image is formed, a heater selection unit that selects from heaters of a fixing device heaters at positions corresponding to areas in which the presence of the image is determined, a heating amount computation unit that computes a heating amount of a heating area heated by each of the selected heaters in a fixing region corresponding to the image formation region, a change amount computation unit that computes an amount of change of the heating amount between adjoining ones of the heating areas, and a heating amount correction unit that corrects one of the heating amounts of the adjoining heating areas so that the amount of change after the correction is less than a predetermined threshold.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: August 25, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Umezawa, Shiho Shimosaka, Katsunori Kume, Koh Tokumaru, Osamu Kizaki, Noboru Sugiura, Norikazu Okada, Atsuki Iwata, Keita Maejima, Tomoyuki Yamashita
  • FIXING CONTROL DEVICE, FIXING CONTROL METHOD, AND IMAGE FORMING APPARATUS
    Publication number: 20140270835
    Abstract: A fixing control device includes an image detection unit that determines presence of an image in each of areas obtained by division of an image formation region in which the image is formed, a heater selection unit that selects from heaters of a fixing device heaters at positions corresponding to areas in which the presence of the image is determined, a heating amount computation unit that computes a heating amount of a heating area heated by each of the selected heaters in a fixing region corresponding to the image formation region, a change amount computation unit that computes an amount of change of the heating amount between adjoining ones of the heating areas, and a heating amount correction unit that corrects one of the heating amounts of the adjoining heating areas so that the amount of change after the correction is less than a predetermined threshold.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 18, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hiroaki UMEZAWA, Shiho SHIMOSAKA, Katsunori KUME, Koh TOKUMARU, Osamu KIZAKI, Noboru SUGIURA, Norikazu OKADA, Atsuki IWATA, Keita MAEJIMA, Tomoyuki YAMASHITA