Patents by Inventor Tomoyasu Hirasawa

Tomoyasu Hirasawa 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: 11371783
    Abstract: A disclosed loop heat pipe includes an evaporator configured to absorb heat from outside by a wall to evaporate a working fluid from a liquid phase to a gas phase; a condenser configured to condense a gas phase working fluid introduced from the evaporator into a liquid phase; an elastic wick configured to contact an inner wall of the evaporator by an elastic force from the elastic wick; and a wick deformation member configured to deform the elastic wick increase a contact pressure of the elastic wick against the inner wall of the evaporator.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: June 28, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomoyasu Hirasawa, Kiyotada Katoh, Takeshi Endoh, Takashi Tanaka, Toshihiko Baba, Keisuke Ikeda, Hiroki Yamasaki
  • Patent number: 11187468
    Abstract: A loop heat pipe wick includes porous rubber.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: November 30, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kiyotada Katoh, Tomoyasu Hirasawa, Norihiko Aze, Takeshi Endoh
  • Publication number: 20200386489
    Abstract: An evaporator for use in a loop heat pipe includes an evaporator body, a heat receiving portion, an inflow portion, a discharge portion, a wick, and a partition. The evaporator body includes an internal space. The heat receiving portion forms an outer surface of the evaporator body to receive heat from an outside of the evaporator body. A working fluid condensed into a liquid phase by a condenser flows into the inflow portion in the internal space. The discharge portion is in the internal space, to discharge a gas-phase working fluid evaporated by the heat received by the heat receiving portion. The working fluid flowing into the inflow portion permeates into the wick in the internal space. The partition partitions the internal space into the inflow portion and the discharge portion with the wick. The wick is sandwiched between a surface of the partition and the heat receiving portion.
    Type: Application
    Filed: May 29, 2020
    Publication date: December 10, 2020
    Inventors: Toshihiko BABA, Tomoyasu HIRASAWA, Keisuke IKEDA, Mayu BANNO
  • Publication number: 20190390918
    Abstract: A disclosed loop heat pipe includes an evaporator configured to absorb heat from outside by a wall to evaporate a working fluid from a liquid phase gas phase; a condenser configured to condense a gas phase working fluid introduced from the evaporator into a liquid phase; an elastic wick configured to contact an inner wall of the evaporator by an elastic force from the elastic wick; and a wick deformation member configured to deform the elastic wick increase a contact pressure of the elastic wick against the inner wall of the evaporator.
    Type: Application
    Filed: June 18, 2019
    Publication date: December 26, 2019
    Inventors: Tomoyasu Hirasawa, Kiyotada Katoh, Takeshi Endoh, Takashi Tanaka, Toshihiko Baba, Keisuke Ikeda, Hiroki Yamasaki
  • Publication number: 20180290476
    Abstract: A light irradiation apparatus includes an irradiation unit including a light source to emit light to a process-target object, a light source driving circuit to drive the light source, a light source controller to control the light source driving circuit to change a light output level of the light source, and a light spot controller to control energy or energy density of a beam spot of the light on the process-target object depending on an operation mode, and a transition mode that one operation mode is being changed to another mode. The light spot controller sets the energy or energy density during the transition mode lower compared to either of the energy or energy density during the one operation mode before the transition mode and the energy or energy density during the another mode after the transition mode.
    Type: Application
    Filed: June 15, 2018
    Publication date: October 11, 2018
    Inventors: Masataka UEHIRA, Kohji SAKAI, Tomoyasu HIRASAWA, Tomomi ISHIMI
  • Patent number: 10071586
    Abstract: A light irradiation apparatus includes an irradiation unit including a light source to emit light to a process-target object, a light source driving circuit to drive the light source, a light source controller to control the light source driving circuit to change a light output level of the light source, and a light spot controller to control energy or energy density of a beam spot of the light on the process-target object depending on an operation mode, and a transition mode that one operation mode is being changed to another mode. The light spot controller sets the energy or energy density during the transition mode lower compared to either of the energy or energy density during the one operation mode before the transition mode and the energy or energy density during the another mode after the transition mode.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: September 11, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Masataka Uehira, Kohji Sakai, Tomoyasu Hirasawa, Tomomi Ishimi
  • Publication number: 20180180360
    Abstract: A loop heat pipe wick includes porous rubber.
    Type: Application
    Filed: December 18, 2017
    Publication date: June 28, 2018
    Inventors: Kiyotada Katoh, Tomoyasu Hirasawa, Norihiko Aze, Takeshi Endoh
  • 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: 9707792
    Abstract: A cooling device including a cooling controller cools a laser light source in a laser device. The laser light source irradiates a medium with a laser beam. The cooling controller controls a cooling operation according to data associated with a heating state of a laser light source in the laser device.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: July 18, 2017
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomoyasu Hirasawa
  • Publication number: 20170001459
    Abstract: A light irradiation apparatus includes an irradiation unit including a light source to emit light to a process-target object, a light source driving circuit to drive the light source, a light source controller to control the light source driving circuit to change a light output level of the light source, and a light spot controller to control energy or energy density of a beam spot of the light on the process-target object depending on an operation mode, and a transition mode that one operation mode is being changed to another mode. The light spot controller sets the energy or energy density during the transition mode lower compared to either of the energy or energy density during the one operation mode before the transition mode and the energy or energy density during the another mode after the transition mode.
    Type: Application
    Filed: June 16, 2016
    Publication date: January 5, 2017
    Inventors: Masataka UEHIRA, Kohji SAKAI, Tomoyasu HIRASAWA, Tomomi ISHIMI
  • Patent number: 9513598
    Abstract: A cooling device includes a rotatable belt extended by a plurarity of extending members that transfers a sheet in contact with the surface of the belt, and a plurality of cooling members to cool the sheet via the belt. A cooling surface of the cooling members contacts an internal surface of the transport belt. The cooling members are detachable. The cooling device also includes an adjuster to adjust a contact condition between the cooling surface and the internal surface according to the number of cooling members installed.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: December 6, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Keisuke Ikeda, Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa
  • 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: 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: 9423730
    Abstract: A cooling device including at least two cooling members to cool a recording medium passing thereover, a coolant circulation unit to circulate a coolant, and tubing that connects the coolant circulation unit to the cooling members and through which the coolant circulates. Each of the cooling members includes a heat-absorbing surface that directly contacts the recording medium or indirectly contacts the recording medium via a thermal transmission member, an internal channel provided within each of the cooling members through which the coolant circulates, and a channel inlet and outlet formed at downstream and upstream ends of each of the cooling members in a direction of conveyance of the recording medium, respectively. One of an interval and a thermal insulator is provided between the cooling members.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: August 23, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Keisuke Ikeda, Satoshi Okano, Tomoyasu Hirasawa, Masanori Saitoh, Takehara Kenichi, Hiromitsu Fujiya
  • Patent number: 9400485
    Abstract: In a cooling device that includes a cooling roller that comprises a hollow tubular member and a cooling medium transport unit for transporting a cooling liquid to the inside of the cooling roller and contacts a sheet-like member to cool down the paper, a turbulence generating unit that generates turbulence in a cooling liquid is disposed near an inner wall of the outer tube.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: July 26, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Okano, Takayuki Nishimura, Kenichi Takehara, Yasuaki Iijima, Hiromitsu Fujiya, Tomoyasu Hirasawa, Masanori Saitoh, Shingo Suzuki, Keisuke Yuasa, Keisuke Ikeda
  • Publication number: 20160211636
    Abstract: A cooling device including a cooling controller cools a laser light source in a laser device. The laser light source irradiates a medium with a laser beam. The cooling controller controls a cooling operation according to data associated with a heating state of a laser light source in the laser device.
    Type: Application
    Filed: January 14, 2016
    Publication date: July 21, 2016
    Inventor: Tomoyasu Hirasawa
  • Publication number: 20160195847
    Abstract: A cooling device includes a rotatable belt extended by a plurarity of extending members that transfers a sheet in contact with the surface of the belt, and a plurality of cooling members to cool the sheet via the belt. A cooling surface of the cooling members contacts an internal surface of the transport belt. The cooling members are detachable. The cooling device also includes an adjuster to adjust a contact condition between the cooling surface and the internal surface according to the number of cooling members installed.
    Type: Application
    Filed: March 10, 2016
    Publication date: July 7, 2016
    Inventors: Keisuke IKEDA, Tomoyasu HIRASAWA, Kenichi TAKEHARA, Hiromitsu FUJIYA, Keisuke YUASA
  • 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: 9360837
    Abstract: An air-conditioning unit includes an air conditioner to control air temperature, a first channel to guide air supplied from the air conditioner to a conditioning target, a heat exchange channel through which the air supplied from the air conditioner exchanges heat with the conditioning target, a second channel to guide air from the conditioning target either outside the air-conditioning unit or to the air conditioner, and a channel switching unit to cause the air conditioner to suck in either external air or the air guided from the conditioning target.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: June 7, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyasu Hirasawa, Kenichi Takehara, Hiromitsu Fujiya, Keisuke Yuasa, Yasuaki Toda, Keisuke Ikeda