Patents by Inventor Marehiko Hirajima

Marehiko Hirajima 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: 10120322
    Abstract: An image forming apparatus includes an image bearing member, a transfer member, a power source, a detection unit, and a fixing unit. The transfer member transfers a toner image to a transfer material from the image bearing member. The detection unit detects electric current flowing in the transfer member when the power source applies voltage to the transfer member. The fixing unit fixes a toner image to a transfer material by heat. The heat to the fixing unit is controlled where a subsequent transfer material conveyance stops after the transfer material is discharged from the fixing unit, in a case where a second current value, detected when voltage is applied to the transfer member contacting the fixing unit and the transfer member, is greater than a first current value detected when voltage is applied to the transfer member before the transfer material reaches the fixing unit.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: November 6, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaru Ohno, Kenji Watanabe, Takao Kume, Marehiko Hirajima
  • Publication number: 20180004149
    Abstract: An image forming apparatus includes an image bearing member, a transfer member, a power source, a detection unit, and a fixing unit. The transfer member transfers a toner image to a transfer material from the image bearing member. The detection unit detects electric current flowing in the transfer member when the power source applies voltage to the transfer member. The fixing unit fixes a toner image to a transfer material by heat. The heat to the fixing unit is controlled where a subsequent. transfer material conveyance stops after the transfer material is discharged from the fixing unit, in a case where a second current value, detected when voltage is applied to the transfer member contacting the fixing unit and the transfer member, is greater than a first current value detected. when voltage is applied to the transfer member before the transfer material reaches the fixing unit.
    Type: Application
    Filed: June 20, 2017
    Publication date: January 4, 2018
    Inventors: Masaru Ohno, Kenji Watanabe, Takao Kume, Marehiko Hirajima
  • Patent number: 9663310
    Abstract: A sheet feeding device includes a raising and lowering portion, a first detecting portion, a feeding portion, a second detecting portion, and a controller. When a change in a state of the feeding roller from a state of being in an uppermost sheet feedable position to a state of being not in the uppermost sheet feedable position is detected by the second detecting portion and then a change in a state of the uppermost sheet from a state of being in a feeding position to a state of being not in the feeding position is detected by the first detecting portion, the controller controls the raising and lowering portion to raise the stacking member on the basis of a correction amount determined based on a time from change timing of the second detecting portion to change timing of the first detecting portion.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: May 30, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Marehiko Hirajima
  • Publication number: 20160355355
    Abstract: A sheet feeding device includes a raising and lowering portion, a first detecting portion, a feeding portion, a second detecting portion, and a controller. When a change in a state of the feeding roller from a state of being in an uppermost sheet feedable position to a state of being not in the uppermost sheet feedable position is detected by the second detecting portion and then a change in a state of the uppermost sheet from a state of being in a feeding position to a state of being not in the feeding position is detected by the first detecting portion, the controller controls the raising and lowering portion to raise the stacking member on the basis of a correction amount determined based on a time from change timing of the second detecting portion to change timing of the first detecting portion.
    Type: Application
    Filed: May 26, 2016
    Publication date: December 8, 2016
    Inventor: Marehiko Hirajima
  • Patent number: 9001351
    Abstract: An image forming apparatus includes first through third control units, with the first for processing input image information and each of the second and third for controlling an operation of an image forming unit by communication with the first. In a first mode, in which power is supplied to the first through third control units, the first and third control units communicate via the second control unit. In a second mode, in which the first control unit does not communicate with the second control unit, the first and third control units communicate via a communication line without communicating via the second control unit. The power consumption of the second mode is lower than that of the first mode. In the second mode, the first and third control units can transmit information for transition from the second mode to the first mode to each other via the communication line.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: April 7, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hidehiro Wakamiya, Marehiko Hirajima
  • Patent number: 8958094
    Abstract: An image forming apparatus includes first through third control units, with the first for processing input image information and each of the second and third for controlling an operation of an image forming unit by communication with the first. In a first mode, in which power is supplied to the first through third control units, the first and third control units communicate via the second control unit. In a second mode, in which the first control unit does not communicate with the second control unit, the first and third control units communicate via a communication line without communicating via the second control unit. The power consumption of the second mode is lower than that of the first mode. In the second mode, the first and third control units can transmit information for transition from the second mode to the first mode to each other via the communication line.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: February 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hidehiro Wakamiya, Marehiko Hirajima
  • Publication number: 20140146347
    Abstract: An image forming apparatus includes first through third control units, with the first for processing input image information and each of the second and third for controlling an operation of an image forming unit by communication with the first. In a first mode, in which power is supplied to the first through third control units, the first and third control units communicate via the second control unit. In a second mode, in which the first control unit does not communicate with the second control unit, the first and third control units communicate via a communication line without communicating via the second control unit. The power consumption of the second mode is lower than that of the first mode. In the second mode, the first and third control units can transmit information for transition from the second mode to the first mode to each other via the communication line.
    Type: Application
    Filed: January 29, 2014
    Publication date: May 29, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hidehiro Wakamiya, Marehiko Hirajima
  • Patent number: 8677156
    Abstract: An image forming apparatus includes an image controller that performs processing of input image information, an engine controller into which a first processing part and a second processing part are combined, and a power supply that supplies power to the engine controller. A mode of the image forming apparatus is switchable from a first mode that is a state of image formation or a stand-by state, to a second mode whose power consumption is smaller than a power consumption of the first mode. In addition, a switch unit switches between the first mode in which power is supplied to the second processing part from the power supply. The image controller and the first processing part communicate with each other through the second processing part in the first mode, or the image controller and the first processing part communicate with each other through a communication line but not through the second processing part in the second mode.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: March 18, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hidehiro Wakamiya, Marehiko Hirajima
  • Patent number: 8444137
    Abstract: In a sheet feeding cassette which lifts up and lifts down a bottom plate each time when a paper is fed, a recording material sensor detects that no recording materials exist when the bottom plate rises over a predetermined position. Accordingly, by measuring a period of time when it is detected that no recording materials exist during a sheet feeding operation, a stacking amount of the recording materials in a sheet feeding cassette can be detected.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: May 21, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Marehiko Hirajima
  • Publication number: 20120112407
    Abstract: In a sheet feeding cassette which lifts up and lifts down a bottom plate each time when a paper is fed, a recording material sensor detects that no recording materials exist when the bottom plate rises over a predetermined position. Accordingly, by measuring a period of time when it is detected that no recording materials exist during a sheet feeding operation, a stacking amount of the recording materials in a sheet feeding cassette can be detected.
    Type: Application
    Filed: November 3, 2011
    Publication date: May 10, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Marehiko Hirajima
  • Publication number: 20110080605
    Abstract: The image controller includes a FET which stops supply power from a low-voltage power supply to an ASIC (second processing unit) in a power-saving mode and starts the supply power in a normal mode, and a communication line for issuing a notification pertaining to transition from the power-saving mode to the normal mode between the image controller and a CPU(first processing part). The CPU controls the FET so as to start supply power to the ASIC when instructed by the image controller to transition from the power-saving mode to the normal mode through the communication line.
    Type: Application
    Filed: September 29, 2010
    Publication date: April 7, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hidehiro Wakamiya, Marehiko Hirajima
  • Publication number: 20080285988
    Abstract: An image forming apparatus includes a storage unit configured to store a recording medium, an image forming unit configured to form an image on the recording medium, a paper feed unit configured to supply the recording medium from the storage unit, a conveying unit configured to convey the recording medium supplied by the paper feed unit to the image forming unit, and a control unit configured to control the paper feed unit and the conveying unit in conveying the recording medium. In accordance with a conveyance state in which the recording medium supplied from the storage unit by the paper feed unit is conveyed to the conveying unit, the control unit controls the conveying speed of the next recording medium supplied by the paper feed unit.
    Type: Application
    Filed: December 10, 2007
    Publication date: November 20, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Wataru Uchida, Kazuhiro Hosohara, Marehiko Hirajima, Yuya Kojima, Yoshihiro Ito
  • Patent number: 6954596
    Abstract: An image forming apparatus in which information regarding used amounts in image forming apparatus main bodies of different features is stored in the storage part of a cartridge, and the interchange time of the cartridge is judged by the use of the information. Thereby, even if a cartridge having interchangeability between a plurality of kinds of image forming apparatus main bodies of different features is mounted on each of the main bodies of different features, an interchange time corresponding to the main body can be grasped accurately.
    Type: Grant
    Filed: August 28, 2003
    Date of Patent: October 11, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masanobu Saito, Marehiko Hirajima
  • Publication number: 20040091274
    Abstract: An image forming apparatus in which information regarding used amounts in image forming apparatus main bodies of different features is stored in the storage part of a cartridge, and the interchange time of the cartridge is judged by the use of the information. Thereby, even if a cartridge having interchangeability between a plurality of kinds of image forming apparatus main bodies of different features is mounted on each of the main bodies of different features, an interchange time corresponding to the main body can be grasped accurately.
    Type: Application
    Filed: August 28, 2003
    Publication date: May 13, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masanobu Saito, Marehiko Hirajima