Patents by Inventor Yasuhiko Ogino

Yasuhiko Ogino 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: 10088781
    Abstract: An image forming apparatus includes a transfer member configured to abut against an image carrier for carrying a toner image to form a transfer nip; and a power supply configured to output a bias voltage for transferring the toner image on the image carrier onto a recording medium nipped in the transfer nip. The bias voltage includes a first voltage for transferring the toner image from the image carrier onto the recording medium in a transfer direction and a second voltage having an opposite polarity of the first voltage, the first and the second voltages being alternately output. A time-averaged value of the bias voltage is set to a polarity in the transfer direction and is set in the transfer direction side with respect to a median between a maximum and a minimum of the bias voltage.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: October 2, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinya Tanaka, Naomi Sugimoto, Haruo Iimura, Shinji Aoki, Yasuhiko Ogino, Kazuchika Saeki, Keigo Nakamura
  • Patent number: 9874839
    Abstract: A fixing device includes a fixing rotator rotatable in a predetermined direction of rotation and a nip formation pad disposed inside the fixing rotator. A pressure rotator presses against the nip formation pad via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. A heat generator is disposed inside the fixing rotator to heat the fixing rotator. A reflector is interposed between the heat generator and the nip formation pad. The reflector includes a reflection face to reflect radiant heat radiated from the heat generator. The reflection face includes a reflection portion disposed opposite the heat generator at various angles. A support is provided separately from the nip formation pad and supports the reflector.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: January 23, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazunari Sawada, Kenji Ishii, Kazuhito Kishi, Takayuki Seki, Hiroshi Yoshinaga, Takashi Seto, Hiromasa Takagi, Ippei Fujimoto, Takamasa Hase, Yasuhiko Ogino, Shohta Kobashigawa
  • Patent number: 9851663
    Abstract: A fixing device includes a primary heater disposed opposite a fixing rotator to heat a circumferential span of the fixing rotator other than a fixing nip formed between the fixing rotator and a pressure rotator and a secondary heater disposed outboard from the primary heater in an axial direction of the fixing rotator to heat the fixing rotator at the fixing nip. The primary heater and the secondary heater heat a bi-heating span of the fixing rotator in the axial direction thereof. The secondary heater heats a mono-heating span of the fixing rotator in the axial direction thereof and generates a decreased amount of heat to be conducted to the bi-heating span of the fixing rotator. The decreased amount of heat is smaller than an increased amount of heat to be conducted to the mono-heating span of the fixing rotator that is heated by the secondary heater only.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: December 26, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Shohta Kobashigawa, Kenji Ishii, Kazuhito Kishi, Takayuki Seki, Hiroshi Yoshinaga, Takashi Seto, Hiromasa Takagi, Ippei Fujimoto, Hiroshi Seo, Takamasa Hase, Kazunari Sawada, Yasuhiko Ogino
  • Patent number: 9829840
    Abstract: A fixing device includes a nip formation pad that presses against a pressure rotator via an endless belt to form a fixing nip between the belt and the pressure rotator, through which a recording medium bearing a toner image is conveyed. A fixing heater is disposed opposite at least a center span of a conveyance span of the belt in an axial direction thereof where the recording medium is conveyed to heat the belt. A first lateral end heater and a second lateral end heater are mounted on the nip formation pad and disposed opposite a first lateral end span and a second lateral end span of an inner circumferential surface of the belt in the axial direction thereof, respectively, to heat the belt. The second lateral end heater is electrically connected in series to the first lateral end heater.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: November 28, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Seto, Kenji Ishii, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa, Kazuhito Kishi, Ippei Fujimoto, Kazunari Sawada, Hiroshi Yoshinaga, Hiromasa Takagi, Takamasa Hase, Hiroshi Seo
  • Patent number: 9778606
    Abstract: A fixing device includes a first heater and a second heater disposed inside a fixing rotator to heat the fixing rotator. The first heater generates an increased amount of heat and includes a first heat generator having a first heating span in a longitudinal direction of the first heater. The second heater generates a decreased amount of heat and includes a second heat generator having a second heating span in a longitudinal direction of the second heater. A partition is interposed between the first heater and the second heater to define a first compartment having an increased size and accommodating the first heater and a second compartment having a decreased size and accommodating the second heater.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: October 3, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Takayuki Seki, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa, Kenji Ishii, Kazuhito Kishi, Takashi Seto, Ippei Fujimoto, Kazunari Sawada, Hiroshi Yoshinaga
  • Patent number: 9678460
    Abstract: A fixing device includes a primary heater, a secondary heater, and a tertiary heater to heat a primary heating span, a secondary heating span, and a tertiary heating span of a fixing rotator, respectively. A primary temperature detector and a secondary temperature detector detect a temperature of the fixing rotator. A tertiary temperature detector detects a temperature of a pressure rotator. A controller selectively performs a primary control mode to de-energize the tertiary heater and a secondary control mode to connect the secondary heater and the tertiary heater in series to energize the primary heater, the secondary heater, and the tertiary heater. The controller energizes the secondary heater and the tertiary heater in the secondary control mode based on the temperature of the fixing rotator and the pressure rotator detected by the secondary temperature detector and the tertiary temperature detector, respectively.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: June 13, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Takamasa Hase, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa, Kenji Ishii, Kazuhito Kishi, Takashi Seto, Hiroshi Seo, Ippei Fujimoto, Hiroshi Yoshinaga, Hiromasa Takagi, Kazunari Sawada
  • Publication number: 20170146931
    Abstract: An image forming apparatus includes a transfer member configured to abut against an image carrier for carrying a toner image to form a transfer nip; and a power supply configured to output a bias voltage for transferring the toner image on the image carrier onto a recording medium nipped in the transfer nip. The bias voltage includes a first voltage for transferring the toner image from the image carrier onto the recording medium in a transfer direction and a second voltage having an opposite polarity of the first voltage, the first and the second voltages being alternately output. A time-averaged value of the bias voltage is set to a polarity in the transfer direction and is set in the transfer direction side with respect to a median between a maximum and a minimum of the bias voltage.
    Type: Application
    Filed: December 23, 2016
    Publication date: May 25, 2017
    Inventors: Shinya TANAKA, Naomi Sugimoto, Haruo Iimura, Shinji Aoki, Yasuhiko Ogino, Kazuchika Saeki, Keigo Nakamura
  • Patent number: 9651905
    Abstract: A fixing device includes a fixing rotator and a heater disposed inside the fixing rotator to heat the fixing rotator with radiant heat. A pressure rotator presses against the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. A reflector is disposed opposite the heater to reflect the radiant heat radiated from the heater to the fixing rotator. The reflector includes a first parallel plane, a second parallel plane, and a third tilt plane. The second parallel plane is parallel to the first parallel plane and stepped with respect to the first parallel plane. The second parallel plane is disposed closer to the fixing nip and the heater than the first parallel plane. The third tilt plane bridges the first parallel plane and the second parallel plane and is disposed opposite the heater.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: May 16, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Ippei Fujimoto, Kazuhito Kishi, Takashi Seto, Takayuki Seki, Kazunari Sawada, Kenji Ishii, Hiroshi Yoshinaga, Hiromasa Takagi, Takamasa Hase, Yasuhiko Ogino, Shohta Kobashigawa
  • Patent number: 9639042
    Abstract: A fixing device includes a nip formation pad to press against a fixing rotator. A primary heater is disposed opposite the fixing rotator in a primary heating span spanning in an axial direction of the fixing rotator to heat the primary heating span of the fixing rotator from which heat is conducted to the nip formation pad with a primary conduction. A secondary heater is disposed opposite the fixing rotator in a secondary heating span that is outboard from the primary heating span in the axial direction of the fixing rotator. The secondary heater is interposed between a first nip formation portion and a second nip formation portion of the nip formation pad to heat the secondary heating span of the fixing rotator through the nip formation pad from which heat is conducted to the fixing rotator with a secondary conduction greater than the primary conduction.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: May 2, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Ishii, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa, Kazuhito Kishi, Takashi Seto, Ippei Fujimoto, Kazunari Sawada, Hiroshi Yoshinaga, Hiromasa Takagi, Takamasa Hase
  • Patent number: 9618886
    Abstract: A nip formation assembly disposed opposite an opposed rotator via an endless belt includes a nip formation pad to press against the opposed rotator via the endless belt to form a fixing nip between the endless belt and the opposed rotator, through which a recording medium bearing a toner image is conveyed. A fixing heater is disposed opposite at least a center span of the endless belt in an axial direction thereof where the recording medium is conveyed. The fixing heater heats the endless belt. A lateral end heater is mounted on the nip formation pad and disposed opposite a lateral end span of an inner circumferential surface of the endless belt in the axial direction thereof. The lateral end heater heats the endless belt.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: April 11, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Seto, Kenji Ishii, Kazuhito Kishi, Ippei Fujimoto, Takayuki Seki, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa, Hiromasa Takagi
  • Patent number: 9612555
    Abstract: A fixing device includes a fixing rotator and an opposed rotator pressed against the fixing rotator to form a fixing nip therebetween. A primary heater is disposed opposite the fixing rotator in a circumferential span of the fixing rotator other than the fixing nip in a circumferential direction of the fixing rotator to heat the fixing rotator. A heat shield is interposed between the primary heater and the fixing rotator and disposed outboard from at least a decreased size recording medium conveyance span of the fixing rotator spanning in an axial direction of the fixing rotator where a recording medium having a decreased size in the axial direction of the fixing rotator is conveyed. The heat shield shields the fixing rotator from the primary heater. A secondary heater is mounted on the heat shield to heat the fixing rotator.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: April 4, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yoshinaga, Kenji Ishii, Kazuhito Kishi, Takashi Seto, Takayuki Seki, Ippei Fujimoto, Kazunari Sawada, Susumu Matsusaka, Yasuhiko Ogino, Shohta Kobashigawa
  • Patent number: 9612556
    Abstract: A fixing device includes a heater to generate heat and a fixing rotator to rotate while contacting the heater. A pressure rotator presses against the heater via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium bearing a toner image is conveyed. The heater includes an insulative substrate and a resistive heat generation layer mounted on the substrate. The resistive heat generation layer is disposed upstream from a center of the fixing nip in a recording medium conveyance direction.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: April 4, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiko Ogino, Kenji Ishii, Takashi Seto, Ippei Fujimoto, Kazuhito Kishi, Kazunari Sawada, Hiroshi Yoshinaga, Hiromasa Takagi, Takamasa Hase, Hiroshi Seo, Susumu Matsusaka, Shohta Kobashigawa
  • Patent number: 9563153
    Abstract: An image forming apparatus includes a transfer member configured to abut against an image carrier for carrying a toner image to form a transfer nip; and a power supply configured to output a bias voltage for transferring the toner image on the image carrier onto a recording medium nipped in the transfer nip. The bias voltage includes a first voltage for transferring the toner image from the image carrier onto the recording medium in a transfer direction and a second voltage having an opposite polarity of the first voltage, the first and the second voltages being alternately output. A time-averaged value of the bias voltage is set to a polarity in the transfer direction and is set in the transfer direction side with respect to a median between a maximum and a minimum of the bias voltage.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: February 7, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinya Tanaka, Naomi Sugimoto, Haruo Iimura, Shinji Aoki, Yasuhiko Ogino, Kazuchika Saeki, Keigo Nakamura
  • Publication number: 20170010570
    Abstract: A fixing device includes a fixing rotator and a heater disposed inside the fixing rotator to heat the fixing rotator with radiant heat. A pressure rotator presses against the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. A reflector is disposed opposite the heater to reflect the radiant heat radiated from the heater to the fixing rotator. The reflector includes a first parallel plane, a second parallel plane, and a third tilt plane. The second parallel plane is parallel to the first parallel plane and stepped with respect to the first parallel plane. The second parallel plane is disposed closer to the fixing nip and the heater than the first parallel plane. The third tilt plane bridges the first parallel plane and the second parallel plane and is disposed opposite the heater.
    Type: Application
    Filed: June 23, 2016
    Publication date: January 12, 2017
    Inventors: Ippei FUJIMOTO, Kazuhito KISHI, Takashi SETO, Takayuki SEKI, Kazunari SAWADA, Kenji ISHll, Hiroshi YOSHINAGA, Hiromasa TAKAGI, Takamasa HASE, Yasuhiko OGINO, Shohta KOBASHIGAWA
  • Publication number: 20160378027
    Abstract: A fixing device includes a fixing rotator rotatable in a predetermined direction of rotation and a nip formation pad disposed inside the fixing rotator. A pressure rotator presses against the nip formation pad via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. A heat generator is disposed inside the fixing rotator to heat the fixing rotator. A reflector is interposed between the heat generator and the nip formation pad. The reflector includes a reflection face to reflect radiant heat radiated from the heat generator. The reflection face includes a reflection portion disposed opposite the heat generator at various angles. A support is provided separately from the nip formation pad and supports the reflector.
    Type: Application
    Filed: June 9, 2016
    Publication date: December 29, 2016
    Inventors: Kazunari SAWADA, Kenji ISHll, Kazuhito KISHI, Takayuki SEKI, Hiroshi YOSHINAGA, Takashi SETO, Hiromasa TAKAGI, lppei FUJIMOTO, Takamasa HASE, Yasuhiko OGINO, Shohta KOBASHIGAWA
  • Publication number: 20160334742
    Abstract: A fixing device includes a primary heater disposed opposite a fixing rotator to heat a circumferential span of the fixing rotator other than a fixing nip formed between the fixing rotator and a pressure rotator and a secondary heater disposed outboard from the primary heater in an axial direction of the fixing rotator to heat the fixing rotator at the fixing nip. The primary heater and the secondary heater heat a bi-heating span of the fixing rotator in the axial direction thereof. The secondary heater heats a mono-heating span of the fixing rotator in the axial direction thereof and generates a decreased amount of heat to be conducted to the bi-heating span of the fixing rotator. The decreased amount of heat is smaller than an increased amount of heat to be conducted to the mono-heating span of the fixing rotator that is heated by the secondary heater only.
    Type: Application
    Filed: May 2, 2016
    Publication date: November 17, 2016
    Inventors: Shohta KOBASHIGAWA, Kenji Ishii, Kazuhito Kishi, Takayuki Seki, Hiroshi Yoshinaga, Takashi Seto, Hiromasa Takagi, Ippei Fujimoto, Hiroshi Seo, Takamasa Hase, Kazunari Sawada, Yasuhiko Ogino
  • Publication number: 20160274514
    Abstract: A fixing device includes a nip formation pad to press against a fixing rotator. A primary heater is disposed opposite the fixing rotator in a primary heating span spanning in an axial direction of the fixing rotator to heat the primary heating span of the fixing rotator from which heat is conducted to the nip formation pad with a primary conduction. A secondary heater is disposed opposite the fixing rotator in a secondary heating span that is outboard from the primary heating span in the axial direction of the fixing rotator. The secondary heater is interposed between a first nip formation portion and a second nip formation portion of the nip formation pad to heat the secondary heating span of the fixing rotator through the nip formation pad from which heat is conducted to the fixing rotator with a secondary conduction greater than the primary conduction.
    Type: Application
    Filed: March 8, 2016
    Publication date: September 22, 2016
    Inventors: Kenji ISHII, Susumu MATSUSAKA, Yasuhiko OGINO, Shohta KOBASHIGAWA, Kazuhito KISHI, Takashi SETO, Ippei FUJIMOTO, Kazunari SAWADA, Hiroshi YOSHINAGA, Hiromasa TAKAGI, Takamasa HASE
  • Publication number: 20160274511
    Abstract: A fixing device includes a heater to generate heat and a fixing rotator to rotate while contacting the heater. A pressure rotator presses against the heater via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium bearing a toner image is conveyed. The heater includes an insulative substrate and a resistive heat generation layer mounted on the substrate. The resistive heat generation layer is disposed upstream from a center of the fixing nip in a recording medium conveyance direction.
    Type: Application
    Filed: February 24, 2016
    Publication date: September 22, 2016
    Inventors: Yasuhiko OGINO, Kenji ISHll, Takashi SETO, lppei FUJIMOTO, Kazuhito KISHI, Kazunari SAWADA, Hiroshi YOSHINAGA, Hiromasa TAKAGI, Takamasa HASE, Hiroshi SEO, Susumu MATSUSAKA, Shohta KOBASHIGAWA
  • Patent number: RE47726
    Abstract: An image forming apparatus includes a nip forming member and a transfer bias output device that outputs a transfer bias to form a transfer electric field in a transfer nip between the nip forming member and an intermediate transfer member. Upon transfer of a composite toner image including a particular toner image onto a recording medium in the transfer nip, the transfer bias output device outputs the transfer bias including a first superimposed bias in which a direct current (DC) component is superimposed on an alternating current (AC) component. Upon transfer of the composite toner image without the particular toner image onto the recording medium in the transfer nip, the transfer bias output device outputs one of the transfer bias including a second superimposed bias having a peak-to-peak value of the AC component smaller than that of the first superimposed bias and the transfer bias including only the DC component.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: November 12, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shinji Aoki, Haruo Iimura, Yasuhiko Ogino, Tadashi Kasai, Naomi Sugimoto, Shinya Tanaka, Keigo Nakamura
  • Patent number: RE48108
    Abstract: An image forming apparatus includes: an image carrier; a toner image forming unit that forms a toner image on the image carrier; a transfer unit that transfers the toner image on the image carrier to a transfer target having ridges and valleys on a surface thereof; an adjusting unit that adjusts a ratio of A/B, where A is a transfer ratio [%] from the image carrier to a valley portion of the transfer target while B is a transfer ratio [%] from the image carrier to a ridge portion of the transfer target, based on an adjustment input by a user; and a control unit that controls a transfer condition of the transfer unit based on the ratio of A/B adjusted by the adjusting unit.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: July 21, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Emiko Shiraishi, Yasuhiko Ogino, Reki Nakamura, Keigo Nakamura, Takahiro Seki