Patents by Inventor Yuji Ieiri

Yuji Ieiri 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).

  • Publication number: 20200301357
    Abstract: An image forming apparatus including an electrode pair including two electrodes facing each other; a powder container interposed between the two electrodes and including a storage medium that is communicably coupled to the image forming apparatus; a capacitance detector configured to detect capacitance between the two electrodes; a powder container mounting determiner configured to determine whether the powder container is mounted to the image forming apparatus based on the capacitance, upon detecting that communication is not possible between the image forming apparatus and the storage medium; and an image forming execution controller configured to cause the image forming apparatus to execute image formation, upon determining, by the powder container mounting determiner, that the powder container is mounted to the image forming apparatus.
    Type: Application
    Filed: March 17, 2020
    Publication date: September 24, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Masashi HOMMI, Tetsuya HARA, Yuji IEIRI, Takumi MIYAGAWA
  • Patent number: 10775729
    Abstract: A remaining toner amount detecting apparatus detects a remaining toner amount in a toner bottle. The remaining toner amount detecting apparatus includes at least one pair of electrodes that are configured to face each other with the toner bottle interposed between the electrodes; a first estimator configured to estimate the remaining toner amount based on a capacitance between the electrodes of the at least one pair of electrodes; a second estimator configured to estimate the remaining toner amount by counting a number of pixels in a printed image; and an estimation selector configured to use either one of the first estimator or the second estimator to output the remaining toner amount, based on a temperature or a humidity inside an apparatus in which the toner bottle is mounted.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: September 15, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Tetsuya Hara, Masashi Hommi, Yuji Ieiri, Takumi Miyagawa
  • Publication number: 20200233361
    Abstract: A remaining toner amount detecting apparatus detects a remaining toner amount in a toner bottle. The remaining toner amount detecting apparatus includes at least one pair of electrodes that are configured to face each other with the toner bottle interposed between the electrodes; a first estimator configured to estimate the remaining toner amount based on a capacitance between the electrodes of the at least one pair of electrodes; a second estimator configured to estimate the remaining toner amount by counting a number of pixels in a printed image; and an estimation selector configured to use either one of the first estimator or the second estimator to output the remaining toner amount, based on a temperature or a humidity inside an apparatus in which the toner bottle is mounted.
    Type: Application
    Filed: January 15, 2020
    Publication date: July 23, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Tetsuya HARA, Masashi HOMMI, Yuji IEIRI, Takumi MIYAGAWA
  • Publication number: 20200201229
    Abstract: A remaining toner amount detecting apparatus includes two electrodes; a remaining toner amount detector configured to detect a remaining toner amount in a toner container based on a capacitance between the two electrodes; a storage configured to store a first capacitance value between the two electrodes preliminarily detected in a non-disposed state in which the toner container is not disposed between the two electrodes; and an abnormality detector configured to detect an abnormality of the remaining toner amount detecting apparatus based on the first capacitance value stored in the storage and a second capacitance value between the two electrodes that is detected in the non-disposed state.
    Type: Application
    Filed: December 13, 2019
    Publication date: June 25, 2020
    Applicant: Ricoh Company, Ltd.
    Inventor: Yuji IEIRI
  • Patent number: 9162443
    Abstract: An ink jet recording device comprises: an ink jet recording head for discharging an ink droplet; and a recording control part for outputting a drive signal to cause the ink jet recording head to discharge an ink droplet, wherein the recording control part includes a current amplifier circuit for amplifying a drive signal by active elements connected in multi-stages, and the current amplifier circuit includes a current interruption element connected to an input side of the active element of the current amplifier circuit on a power source side, the current interruption element being for preventing damage of the active element due to an overcurrent from occurring when a short circuit of the drive signal is generated.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: October 20, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventor: Yuji Ieiri
  • Publication number: 20150174896
    Abstract: An ink jet recording device comprises: an ink jet recording head for discharging an ink droplet; and a recording control part for outputting a drive signal to cause the ink jet recording head to discharge en ink droplet, wherein the recording control part includes a current amplifier circuit for amplifying a drive signal by active elements connected in multi-stages, and the current amplifier circuit includes a current interruption element connected to an input side of the active element of the current amplifier circuit on a power source side, the current interruption element being for preventing damage of the active element due to an overcurrent from occurring when a short circuit of the drive signal is generated.
    Type: Application
    Filed: December 5, 2014
    Publication date: June 25, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventor: Yuji Ieiri
  • Patent number: 9054545
    Abstract: A power supply control device includes a photoelectric conversion unit to convert light energy to electricity, and a power supply control signal output unit driven by power converted by the photoelectric conversion unit and configured to detect a change in lighting intensity at an installation environment of the power control device based on an output voltage of the photoelectric conversion unit to output a power control signal which causes power of an external device to start up or shut down to the external device.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: June 9, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Yuji Ieiri
  • Patent number: 8814302
    Abstract: A defective nozzle detector is included in an inkjet recording apparatus in which a plurality of nozzles to discharge droplets is provided and a recording head including the plurality of nozzles scans while moving in a main scanning direction, thereby forming an image. The defective nozzle detector includes a sensor board on which droplets are impacted from the nozzle of the recording head, a plurality of sensor electrodes and a common electrode alternately disposed on the sensor board and arranged in patterns that intersect the main scanning direction of the recording head, and an electrostatic capacitance sensor to detect changes in the electrostatic capacitance between the sensor electrode and the common electrode.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: August 26, 2014
    Assignee: Ricoh Company, Ltd.
    Inventor: Yuji Ieiri
  • Patent number: 8764143
    Abstract: An image forming apparatus includes: a plurality of heads, each of which includes a capacitive load used as an actuator for discharging ink; a drive-voltage generating circuit that outputs a drive voltage to be applied to the actuator and includes a plurality of current amplifying circuits; and a plurality of head drivers that control the actuators of the heads. Each of the current amplifying circuits is configured to include a plurality of bipolar transistors and to operate so as to equalize output current loads of the bipolar transistors included in the current amplifying circuits, and waveforms of the drive voltages output from the current amplifying circuits are combined to form a combined waveform of the drive voltages to be applied to each of the head drivers.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: July 1, 2014
    Assignee: Ricoh Company, Limited
    Inventor: Yuji Ieiri
  • Publication number: 20130033719
    Abstract: A power supply control device includes a photoelectric conversion unit to convert light energy to electricity, and a power supply control signal output unit driven by power converted by the photoelectric conversion unit and configured to detect a change in lighting intensity at an installation environment of the power control device based on an output voltage of the photoelectric conversion unit to output a power control signal which causes power of an external device to start up or shut down to the external device.
    Type: Application
    Filed: July 24, 2012
    Publication date: February 7, 2013
    Inventor: Yuji IEIRI
  • Publication number: 20120306952
    Abstract: An image forming apparatus includes: a plurality of heads, each of which includes a capacitive load used as an actuator for discharging ink; a drive-voltage generating circuit that outputs a drive voltage to be applied to the actuator and includes a plurality of current amplifying circuits; and a plurality of head drivers that control the actuators of the heads. Each of the current amplifying circuits is configured to include a plurality of bipolar transistors and to operate so as to equalize output current loads of the bipolar transistors included in the current amplifying circuits, and waveforms of the drive voltages output from the current amplifying circuits are combined to form a combined waveform of the drive voltages to be applied to each of the head drivers.
    Type: Application
    Filed: May 10, 2012
    Publication date: December 6, 2012
    Inventor: Yuji IEIRI
  • Publication number: 20110298855
    Abstract: A defective nozzle detector is included in an inkjet recording apparatus in which a plurality of nozzles to discharge droplets is provided and a recording head including the plurality of nozzles scans while moving in a main scanning direction, thereby forming an image. The defective nozzle detector includes a sensor board on which droplets are impacted from the nozzle of the recording head, a plurality of sensor electrodes and a common electrode alternately disposed on the sensor board and arranged in patterns that intersect the main scanning direction of the recording head, and an electrostatic capacitance sensor to detect changes in the electrostatic capacitance between the sensor electrode and the common electrode.
    Type: Application
    Filed: June 1, 2011
    Publication date: December 8, 2011
    Applicant: Ricoh Company, Ltd.
    Inventor: Yuji Ieiri
  • Patent number: 7819492
    Abstract: An image forming apparatus includes an image process control unit processing an image data and generating a control signal, and a drive pattern generation unit to generate a drive pattern to drive a recording head, based on the control signal, the drive pattern generation unit generating at least a first drive pattern and a second drive pattern which is different from the first drive pattern. The drive pattern generation unit sets a reference potential of the second drive pattern as a target reference potential and applying a pattern end of the first drive pattern to one of a pull-up pattern and a pull-down pattern operation before the second drive pattern is performed, wherein the drive pattern generation unit generates one of the pull-up pattern and the pull-down pattern based on a slope value obtained by comparing the target reference potential and the end potential.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: October 26, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Jun Watanabe, Yuji Ieiri, Kohichi Sadano, Tsuyoshi Yamada
  • Patent number: 7789475
    Abstract: In an image forming apparatus, a control unit determines that dirt is present on the linear scale when a detecting unit detects a change in a moving direction of a moving member while the moving member is moving at a constant speed.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: September 7, 2010
    Assignee: Ricoh Company, Limited
    Inventors: Takashi Morishita, Yoshimitsu Ogura, Kenji Kagami, Jun Watanabe, Yuji Ieiri, Tomokazu Tsuchiya, Shigeru Yoshigai
  • Publication number: 20090027432
    Abstract: An image forming apparatus includes an image process control unit processing an image data and generating a control signal, and a drive pattern generation unit to generate a drive pattern to drive a recording head, based on the control signal, the drive pattern generation unit generating at least a first drive pattern and a second drive pattern which is different from the first drive pattern. The drive pattern generation unit sets a reference potential of the second drive pattern as a target reference potential and applying a pattern end of the first drive pattern to one of a pull-up pattern and a pull-down pattern operation before the second drive pattern is performed, wherein the drive pattern generation unit generates one of the pull-up pattern and the pull-down pattern based on a slope value obtained by comparing the target reference potential and the end potential.
    Type: Application
    Filed: July 21, 2008
    Publication date: January 29, 2009
    Inventors: Jun Watanabe, Yuji Ieiri, Kohichi Sadano, Tsuyoshi Yamada
  • Publication number: 20080225070
    Abstract: In an image forming apparatus, a control unit determines that dirt is present on the linear scale when a detecting unit detects a change in a moving direction of a moving member while the moving member is moving at a constant speed.
    Type: Application
    Filed: March 18, 2008
    Publication date: September 18, 2008
    Inventors: Takashi Morishita, Yoshimitsu Ogura, Kenji Kagami, Jun Watanabe, Yuji Ieiri, Tomokazu Tsuchiya, Shigeru Yoshigai