Patents by Inventor Hiroaki Miyagawa

Hiroaki Miyagawa 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: 9864334
    Abstract: A recording-material cooling device includes a first cooling member, a second cooling member, an approach-and-separation member, and a positioning member. The first cooling member is disposed at a first face side of a recording material to absorb heat of the recording material. The second cooling member is disposed at a second face side of the recording material to absorb heat of the recording material. The approach-and-separation member brings the first cooling member and the second cooling member close to and away from each other. The positioning member positions the first cooling member and the second cooling member relatively brought close to each other by the approach-and-separation member.
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: January 9, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Keisuke Ikeda, Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Susumu Tateyama, Hiroaki Miyagawa, Kenji Ishii, Takeshi Watanabe
  • Patent number: 9772585
    Abstract: A cooling conveyor includes a conveyor, a cooler, and a pipe. The conveyor includes at least a first conveyor and a second conveyor to sandwich and convey a recording material. The first conveyor approaches and separates from the second conveyor. The cooler is disposed in the second conveyor to cool the recording material after an image is fixed on the recording material. The pipe is connected to the cooler to flow a cooling liquid into the cooler.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: September 26, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuhiro Shimojima, Hiroaki Miyagawa
  • Patent number: 9567518
    Abstract: Disclosed herein are emissive ceramic elements having low amounts of certain trace elements. Applicants have surprisingly found that a lower internal quantum efficiency (IQE) may be attributed to specific trace elements that, even at very low amounts (e.g., 50 ppm or less), can cause significant deleterious effects on IQE. In some embodiments, the emissive ceramic element includes a garnet host material and an amount of Ce dopant. The emissive ceramic element may, in some embodiments, have an amount of Na in the composition less than about 67 ppm, an amount of Mg in the composition less than about 23 ppm, or an amount of Fe in the composition less than about 21 ppm.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: February 14, 2017
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroaki Miyagawa, Bin Zhang, James Chienchung Shih
  • Patent number: 9563155
    Abstract: A cooling device, which is includable to an image forming apparatus, includes a conveyor, a cooler, and at least one roller. The conveyor conveys a recording medium with a first roller and a second roller each of which is in a loop. The cooler is disposed within the loop of the second belt and cools the recording medium discharged from a fixing device. The at least one roller is a roller within the loop of the first belt and between a first end roller disposed at an end of the first belt facing a plane of a conveyance path. Alternatively, the at least one roller is multiple rollers within the loop of the first belt and contacts an inner circumferential surface of the first belt against the cooler and an upstream roller of the multiple rollers has a smallest pressing force of the multiple rollers.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: February 7, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Ishii, Hiroaki Miyagawa, Tohru Matsumoto, Masahiro Yamazaki, Keisuke Kubota
  • Publication number: 20160355732
    Abstract: A garnet ceramic phosphor with Ce and Mn co-doping, wherein calcium and silicon in the phosphor crystal host can be minimized for enhancing performance, is described herein. Also a ceramic phosphor element comprising a garnet phosphor having composition of formula 1 or 2 is described herein: (A1-x,Cex)3(Al1-y,Mny)5-wSiwO12??(Formula 1) (Lu1-xCex)3(Al1-y,Mny)5-wSiwO12??(Formula 2).
    Type: Application
    Filed: June 8, 2016
    Publication date: December 8, 2016
    Inventors: Hiroaki Miyagawa, Ekambaram Sambandan, Bin Zhang
  • Publication number: 20160342136
    Abstract: A recording-material cooling device includes a first cooling member, a second cooling member, an approach-and-separation member, and a positioning member. The first cooling member is disposed at a first face side of a recording material to absorb heat of the recording material. The second cooling member is disposed at a second face side of the recording material to absorb heat of the recording material. The approach-and-separation member brings the first cooling member and the second cooling member close to and away from each other. The positioning member positions the first cooling member and the second cooling member relatively brought close to each other by the approach-and-separation member.
    Type: Application
    Filed: August 5, 2016
    Publication date: November 24, 2016
    Inventors: Keisuke IKEDA, Tomoyasu HIRASAWA, Kenichi TAKEHARA, Hiromitsu FUJIYA, Keisuke YUASA, Yasuaki TODA, Susumu TATEYAMA, Hiroaki MIYAGAWA, Kenji ISHII, Takeshi WATANABE
  • Patent number: 9499740
    Abstract: Described herein are elements for light emitting devices comprising: an emissive element comprising a host material and an emissive guest material and substantially free of light scattering material; and a light scattering element comprising either a non-emissive or an emissive material, wherein the light scattering element is between about 2.5% to about 60% by volume voids and the thickness ratio of light scattering element to the emissive element is at least 1 to about 2.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: November 22, 2016
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroaki Miyagawa, Bin Zhang
  • Patent number: 9483018
    Abstract: A recording-material cooling device includes a first belt, a first cooling unit, and a second cooling unit. The first belt is disposed at a first face side of a recording material. The first cooling unit has a first heat absorbing surface to contact the first belt to absorb heat of the recording material. The second cooling unit has a second heat absorbing surface to directly or indirectly contact the recording material to absorb heat of the recording material. The second cooling unit is disposed at a second face side of the recording material. The first and second cooling units are offset from each other in a transport direction of the recording material. Each of the first and second surfaces has a shape in which an inner area protrudes beyond opposed ends in the transport direction. The first and second surfaces overlap each other in a direction crossing the transport direction.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: November 1, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Yutaka Shoji, Kenji Ishii, Makoto Nakura, Susumu Tateyama, Hiroaki Miyagawa, Keisuke Ikeda, Takeshi Watanabe
  • Patent number: 9465358
    Abstract: A recording-material cooling device includes a first cooling member, a second cooling member, an approach-and-separation member, and a positioning member. The first cooling member is disposed at a first face side of a recording material to absorb heat of the recording material. The second cooling member is disposed at a second face side of the recording material to absorb heat of the recording material. The approach-and-separation member brings the first cooling member and the second cooling member close to and away from each other. The positioning member positions the first cooling member and the second cooling member relatively brought close to each other by the approach-and-separation member.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: October 11, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Keisuke Ikeda, Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Susumu Tateyama, Hiroaki Miyagawa, Kenji Ishii, Takeshi Watanabe
  • Patent number: 9372465
    Abstract: A recording-material cooling device is disposed downstream from a fixing device in a transport direction of a recording material. The fixing device includes a fixing member and a pressing member to fix an unfixed toner image on the recording material. The recording-material cooling device includes a first cooling unit disposed at a same side as the pressing member relative to the recording material, a second cooling unit disposed at a same side as the fixing member relative to the recording material, and a third cooling unit disposed at the same side as the pressing member relative to the recording material. The first cooling unit, the second cooling unit, and the third cooling unit are arranged in an order of the first cooling unit, the second cooling unit, and the third cooling unit from upstream to downstream in the transport direction of the recording material.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: June 21, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Keisuke Ikeda, Tomoyasu Hirasawa, Yutaka Shoji, Kenji Ishii, Takeshi Watanabe, Susumu Tateyama, Hiroaki Miyagawa, Hiromitsu Fujiya
  • Patent number: 9360838
    Abstract: A liquid type cooling device, which is incorporated in an image forming apparatus, includes a heat releasing unit to release heat of a coolant that passes therethrough, and multiple air blowing fans disposed facing the heat releasing unit to blow air to the heat releasing unit. A cooling capacity of the liquid type cooling device varies according to a type of a recording medium on which an image is formed.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: June 7, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Miyagawa, Satoshi Aizawa, Susumu Tateyama, Tomoyasu Hirasawa
  • Patent number: 9354601
    Abstract: A liquid type cooling device, which is incorporated in an image forming apparatus, includes a heat receiving part including a heat receiving unit to transport heat from a cooling target to a coolant and a heat releasing part including a heat releasing unit, a cooling fan, and an air flowing space. The heat releasing unit has a coolant flowing path and an air flowing path through which air passes and conducts heat exchange with the coolant. The air flowing space has an air inlet port and an air outlet port. When the air flowing path has an upstream region and a downstream region along a coolant flowing direction of the coolant flowing path, air at high temperature flows into the upstream region of the air flowing path. Alternatively, the heat releasing unit may have a coolant inlet port, a coolant outlet port, and the air flowing path.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: May 31, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyasu Hirasawa, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Kenji Ishii, Susumu Tateyama, Hiroaki Miyagawa, Keisuke Ikeda
  • Patent number: 9335676
    Abstract: An image forming apparatus includes a cooling conveyor to cool a recording material having an image fixed by heat while sandwiching and conveying the recording material. The cooling conveyor includes a conveyance belt, a cooling member, and a cooling unit. The conveyance belt sandwiches and conveys the recording material. The cooling member absorbs heat of the recording material via the conveyance belt. The cooling unit maintains the cooling member at low temperature. The cooling conveyor performs control of stopping the cooling unit in a standby state of the image forming apparatus, activating the cooling unit and performing a preliminary cooling operation to decrease temperature of the cooling member after a shift from the standby state to image forming operation, and then bringing the recording material into contact with the conveyance belt.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: May 10, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Miyagawa, Tomoyasu Hirasawa, Keisuke Ikeda, Susumu Tateyama, Kenji Ishii
  • Publication number: 20160060178
    Abstract: A method and apparatus for sintering flat ceramics using a mesh or lattice is described herein.
    Type: Application
    Filed: November 5, 2015
    Publication date: March 3, 2016
    Inventors: Hiroaki Miyagawa, Guang Pan, Hironaka Fujii, Bin Zhang, Amane Mochizuki, Toshitaka Nakamura
  • Publication number: 20160048106
    Abstract: A recording-material cooling device includes a first belt, a first cooling unit, and a second cooling unit. The first belt is disposed at a first face side of a recording material. The first cooling unit has a first heat absorbing surface to contact the first belt to absorb heat of the recording material. The second cooling unit has a second heat absorbing surface to directly or indirectly contact the recording material to absorb heat of the recording material. The second cooling unit is disposed at a second face side of the recording material. The first and second cooling units are offset from each other in a transport direction of the recording material. Each of the first and second surfaces has a shape in which an inner area protrudes beyond opposed ends in the transport direction. The first and second surfaces overlap each other in a direction crossing the transport direction.
    Type: Application
    Filed: October 27, 2015
    Publication date: February 18, 2016
    Inventors: Tomoyasu HIRASAWA, Kenichi TAKEHARA, Hiromitsu FUJIYA, Keisuke YUASA, Yasuaki TODA, Yutaka SHOJI, Kenji ISHII, Makoto NAKURA, Susumu TATEYAMA, Hiroaki MIYAGAWA, Keisuke IKEDA, Takeshi WATANABE
  • Publication number: 20160026125
    Abstract: A cooling device, which is includable to an image forming apparatus, includes a conveyor, a cooler, and at least one roller. The conveyor conveys a recording medium with a first roller and a second roller each of which is in a loop. The cooler is disposed within the loop of the second belt and cools the recording medium discharged from a fixing device. The at least one roller is a roller within the loop of the first belt and between a first end roller disposed at an end of the first belt facing a plane of a conveyance path. Alternatively, the at least one roller is multiple rollers within the loop of the first belt and contacts an inner circumferential surface of the first belt against the cooler and an upstream roller of the multiple rollers has a smallest pressing force of the multiple rollers.
    Type: Application
    Filed: July 23, 2015
    Publication date: January 28, 2016
    Inventors: Kenji ISHII, Hiroaki MIYAGAWA, Tohru MATSUMOTO, Masahiro YAMAZAKI, Keisuke KUBOTA
  • Patent number: 9217979
    Abstract: A recording-material cooling device includes a first belt, a first cooling unit, and a second cooling unit. The first belt is disposed at a first face side of a recording material. The first cooling unit has a first heat absorbing surface to contact the first belt to absorb heat of the recording material. The second cooling unit has a second heat absorbing surface to directly or indirectly contact the recording material to absorb heat of the recording material. The second cooling unit is disposed at a second face side of the recording material. The first and second cooling units are offset from each other in a transport direction of the recording material. Each of the first and second surfaces has a shape in which an inner area protrudes beyond opposed ends in the transport direction. The first and second surfaces overlap each other in a direction crossing the transport direction.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: December 22, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Yutaka Shoji, Kenji Ishii, Makoto Nakura, Susumu Tateyama, Hiroaki Miyagawa, Keisuke Ikeda, Takeshi Watanabe
  • Patent number: 9205571
    Abstract: A method and apparatus for sintering flat ceramics using a mesh or lattice is described herein.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 8, 2015
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroaki Miyagawa, Guang Pan, Hironaka Fujii, Bin Zhang, Amane Mochizuki, Toshitaka Nakamura
  • Patent number: 9206086
    Abstract: A method and apparatus for sintering flat ceramics using a mesh or lattice is described herein.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: December 8, 2015
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroaki Miyagawa, Guang Pan, Hironaka Fujii, Bin Zhang, Amane Mochizuki, Toshitaka Nakamura
  • Patent number: 9170561
    Abstract: A cooling device, which is included in an image forming apparatus, includes multiple air blowers to cool a cooling target provided to the image forming apparatus and a duct to connect with the multiple air blowers and to flow airflow generated by the multiple air blowers therethrough and to have an opening formed thereon and disposed at a position shifted to a part of the multiple air blowers. Respective outputs of the multiple air blowers are different from each other according to respective positions of the multiple air blowers with respect to the opening.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: October 27, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Miyagawa, Koji Kawahara