Patents by Inventor Ryohta KUBOKAWA

Ryohta KUBOKAWA 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: 9661169
    Abstract: An electric power supplying device includes a main power supply that supplies electric power to each component of an apparatus, an auxiliary power supply that supplies electric power to an assisted component in the apparatus, the assisted component requiring power supply during start-up time of the apparatus and having a whose start-up time being equal to or longer than a predetermined period of time, a discharging control circuit that controls the auxiliary power supply to cause the auxiliary power supply to output a voltage, the output voltage being lower than a voltage output by the main power supply and being equal to or more than a lower limit voltage of a voltage range that the assisted component is operable, and a power supply prevention circuit that prevents the auxiliary power supply from supplying power to a component other than the assisted component in the apparatus.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: May 23, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Yamashita, Atsuki Iwata, Takuma Kasai, Norikazu Okada, Homare Ehara, Tetsuya Yano, Toshimasa Aoki, Ryohta Kubokawa, Shuntaroh Nakayama, Takaaki Shirai
  • Patent number: 9541867
    Abstract: An image forming apparatus includes a fixing device to fix an image on a recording medium by heating the recording medium, multiple heat storing devices to store heat generated at the fixing device, an electric generating element to generate power by converting the heat into power, and a switch to switch connection and disconnection between the electric generating element and at least one of the multiple heat storing devices.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: January 10, 2017
    Assignee: Rioch Company, Ltd.
    Inventors: Homare Ehara, Takaaki Shirai, Norikazu Okada, Tomoyuki Yamashita, Ryohta Kubokawa, Takuma Kasai, Keita Maejima
  • Publication number: 20160344885
    Abstract: An electric power supplying device includes a main power supply that supplies electric power to each component of an apparatus, an auxiliary power supply that supplies electric power to an assisted component in the apparatus, the assisted component requiring power supply during start-up time of the apparatus and having a whose start-up time being equal to or longer than a predetermined period of time, a discharging control circuit that controls the auxiliary power supply to cause the auxiliary power supply to output a voltage, the output voltage being lower than a voltage output by the main power supply and being equal to or more than a lower limit voltage of a voltage range that the assisted component is operable, and a power supply prevention circuit that prevents the auxiliary power supply from supplying power to a component other than the assisted component in the apparatus.
    Type: Application
    Filed: May 13, 2016
    Publication date: November 24, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomoyuki Yamashita, Atsuki Iwata, Takuma Kasai, Norikazu Okada, Homare Ehara, Tetsuya Yano, Toshimasa Aoki, Ryohta Kubokawa, Shuntaroh Nakayama, Takaaki Shirai
  • Publication number: 20160336799
    Abstract: A commercial AC power shutdown detecting apparatus includes a photocoupler including a light-emitting element and a light-receiving element, a lighting circuit that flows a pulsating current through the light-emitting element of the photocoupler to turn on and off light of the light-emitting element, a charging-discharging circuit including a capacitor and a resistor that charges the capacitor via the resistor when the light-emitting element is turned off, and discharges the capacitor via the light-receiving element and the a resistor when the light-emitting element is turned on, and a comparing circuit that compares a voltage value between capacitor terminals with a predetermined voltage value intermediate between a maximum voltage value between the capacitor terminals when the light-emitting element repeats turning light on and off and the consistent DC voltage value, and outputs a shutdown detection signal if the voltage value between the capacitor terminals exceeds the predetermined voltage value.
    Type: Application
    Filed: May 1, 2016
    Publication date: November 17, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Atsuki Iwata, Takuma Kasai, Norikazu Okada, Homare Ehara, Tetsuya Yano, Toshimasa Aoki, Tomoyuki Yamashita, Ryohta Kubokawa, Shuntaroh Nakayama, Takaaki Shirai
  • Patent number: 9429909
    Abstract: An image forming apparatus includes a heat-generating component, a power generation device including a thermoelectric element, a heat radiation device, a cooling device, a temperature detector that detects a temperature increase of the heat-generating component, and a controller. The heat radiation device includes a first radiator plate interposed between the heat-generating component and a surface of the thermoelectric element and a second radiator plate attached to another surface of the thermoelectric element. The cooling device cools the first radiator plate. The controller controls operations of the cooling device and the power generation device by operating the cooling device if the detected temperature increase reaches at least a predetermined threshold value, and causing the power generation device to generate power without operating the cooling device to cool the first radiator plate passively if the detected temperature increase falls below the predetermined threshold value.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: August 30, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takaaki Shirai, Satoru Tao, Takuma Kasai, Norikazu Okada, Homare Ehara, Keita Maejima, Tomoyuki Yamashita, Ryohta Kubokawa
  • Patent number: 9389573
    Abstract: An image forming apparatus includes a heat generator configured to generate heat in the image forming apparatus; a converter including a capacitor to convert AC power supplied from an external power supply into DC power for a load unit; a thermoelectric transducer configured to convert the generated heat into DC power for the load unit; a detector configured to detect a voltage of the AC power; and a controller configured to cause the converter to continue supplying the DC power to the load unit when a first elapsed time elapsed since the detected voltage drops below a rated voltage is shorter than a first time period shorter than an upper limit of a period of time over which the capacitor is dischargeable, and cause the thermoelectric transducer to supply the DC power to the load unit when the first elapsed time exceeds the first time period.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: July 12, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Norikazu Okada, Takaaki Shirai, Takuma Kasai, Keita Maejima, Tomoyuki Yamashita, Ryohta Kubokawa, Satoru Tao, Homare Ehara
  • Publication number: 20160077475
    Abstract: An image forming apparatus includes a fixing device to fix an image on a recording medium by heating the recording medium, multiple heat storing devices to store heat generated at the fixing device, an electric generating element to generate power by converting the heat into power, and a switch to switch connection and disconnection between the electric generating element and at least one of the multiple heat storing devices.
    Type: Application
    Filed: August 31, 2015
    Publication date: March 17, 2016
    Applicant: Ricoh Company, Ltd.
    Inventors: Homare EHARA, Takaaki SHIRAI, Norikazu OKADA, Tomoyuki YAMASHITA, Ryohta KUBOKAWA, Takuma KASAI, Keita MAEJIMA
  • Publication number: 20150370216
    Abstract: An image forming apparatus includes a heat generator configured to generate heat in the image forming apparatus; a converter including a capacitor to convert AC power supplied from an external power supply into DC power for a load unit; a thermoelectric transducer configured to convert the generated heat into DC power for the load unit; a detector configured to detect a voltage of the AC power; and a controller configured to cause the converter to continue supplying the DC power to the load unit when a first elapsed time elapsed since the detected voltage drops below a rated voltage is shorter than a first time period shorter than an upper limit of a period of time over which the capacitor is dischargeable, and cause the thermoelectric transducer to supply the DC power to the load unit when the first elapsed time exceeds the first time period.
    Type: Application
    Filed: June 22, 2015
    Publication date: December 24, 2015
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Norikazu OKADA, Takaaki SHIRAI, Takuma KASAI, Keita MAEJIMA, Tomoyuki YAMASHITA, Ryohta KUBOKAWA, Satoru TAO, Homare EHARA
  • Publication number: 20150177684
    Abstract: An image forming apparatus includes a heat-generating component, a power generation device including a thermoelectric element, a heat radiation device, a cooling device, a temperature detector that detects a temperature increase of the heat-generating component, and a controller. The heat radiation device includes a first radiator plate interposed between the heat-generating component and a surface of the thermoelectric element and a second radiator plate attached to another surface of the thermoelectric element. The cooling device cools the first radiator plate. The controller controls operations of the cooling device and the power generation device by operating the cooling device if the detected temperature increase reaches at least a predetermined threshold value, and causing the power generation device to generate power without operating the cooling device to cool the first radiator plate passively if the detected temperature increase falls below the predetermined threshold value.
    Type: Application
    Filed: December 22, 2014
    Publication date: June 25, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takaaki SHIRAI, Satoru TAO, Takuma KASAI, Norikazu OKADA, Homare EHARA, Keita MAEJIMA, Tomoyuki YAMASHITA, Ryohta KUBOKAWA