Patents by Inventor Akihisa Miyazoe

Akihisa Miyazoe 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: 10622130
    Abstract: A superconducting magnet in which efficiency of conduction cooling is improved is described as well as a magnetic resonance imaging apparatus that includes the superconducting magnet and requires no liquid helium. The magnet resonance imaging apparatus includes: a coil portion including a winding core, a winding portion formed by winding a wire around the winding core, a first flange provided on one side of the winding core, and a second flange provided on the other side of the winding core; a cooling device for cooling the coil portion; and a heat conducting member for thermally connecting the coil portion and the cooling device, in which at least one of the first flange, the second flange, and the winding core has a region made of a material whose thermal contraction rate is larger than a thermal contraction rate of the winding portion.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: April 14, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Chishin Hori, Manabu Aoki, Akihisa Miyazoe, Yukinobu Imamura
  • Patent number: 10559411
    Abstract: The objective of the present invention is to provide a conduction-cooling-type super-conducting magnet, wherein a surface pressure is applied between a super-conducting coiled wire portion and a cooling member, the non-uniformity of the surface pressure in the diameter direction of the coiled wire portion has been improved, whereby the uniformity of contact heat resistance has been improved, moreover, warping due to a thermal contraction difference between the cooling member and the coiled wire portion arising at cooling time has been decreased sufficiently, and a surface pressure application mechanism can be installed solely in the low-temperature portion where the super-conducting coiled wire portion is installed.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: February 11, 2020
    Assignee: HITACHI, LTD.
    Inventors: Akihisa Miyazoe, Mitsushi Abe
  • Publication number: 20190313521
    Abstract: A deflection electromagnet device generates a high magnetic field without increasing the size of a vacuum duct to facilitate control over a beam orbit. Magnetic flux lines from a return pole pass through the vacuum duct of a high-temperature superconductor in a vacuum heat insulation container and the charged particle beam is thus deflected, thereby generating radiation. A three-pole magnetic field is formed on the beam orbit and the charged particle beam is thus deflected by individual magnetic fields, so that radiation can be generated while the charged particle beam returns to a coaxial orbit. Therefore, an increase in size of the vacuum duct can be prevented. A shielding current is dominant and the non-uniformity of the magnetic field in a z-axis direction is prevented by disposing the high-temperature superconductor having a crystal direction c-axis orthogonal to a horizontal plane in which the charged particle beam flows.
    Type: Application
    Filed: January 22, 2018
    Publication date: October 10, 2019
    Inventors: Akihisa MIYAZOE, Yukihiro MURATA
  • Patent number: 10424428
    Abstract: An object is to provide a super-conducting coil and a magnetic resonance imaging device that are quench-free by reducing Joule heat generated upon occurrence of separation of members even in a high magnetic field. The super-conducting coil in accordance with the present invention includes a spool and a super-conducting wire wound around the spool. The coil further includes, between the spool and the super-conducting wire, a first resin layer containing thermoplastic resin, a second resin layer containing thermosetting resin, and a mixed layer, the mixed layer being positioned between the first resin layer and the second resin layer and containing a mixture of the thermoplastic resin and the thermosetting resin.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: September 24, 2019
    Assignee: HITACHI, LTD.
    Inventors: Masahiro Kawasaki, Kenji Okishiro, Tadashi Arai, Akihisa Miyazoe
  • Patent number: 10056178
    Abstract: The superconducting magnet device reduces the number of connections within and/or the number of wires leading out of a superconducting coil winding and promptly starts expending the magnetic energy in a superconducting coil operating in a persistent-current mode when the superconducting coil increases in temperature or transitions to normal conductivity. This invention provides a superconducting magnet device that has the following: a superconducting coil connected to an excitation power supply; a persistent-current switch connected to the superconducting coil; a heater that controls the temperature of the persistent-current switch; a current source that is connected in parallel with the persistent-current switch and has a different polarity from the excitation power supply; a driving circuit connected to the heater and the current source; and a signal-inputting means for inputting a signal to the driving circuit.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: August 21, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Akihisa Miyazoe, Takeshi Nakayama, Manabu Aoki
  • Patent number: 9852831
    Abstract: This superconducting magnet includes: a superconducting coil that is formed by winding a first superconducting wire rod; a second superconducting wire rod, which is disposed by being thermally in contact with and electrically insulated from the superconducting coil, and which has a superconducting transition temperature that is lower than that of the first superconducting wire rod; voltage terminals that are disposed at a plurality of areas of the second superconducting wire rod; a voltmeter connected to the voltage terminals; and a switch circuit connected to the voltmeter. The switch circuit interrupts a current when receiving an output from the voltmeter, the current being one that is to be supplied to the superconducting coil.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: December 26, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Akihisa Miyazoe, Takeshi Nakayama, Ryuya Ando, Manabu Aoki
  • Publication number: 20170117076
    Abstract: The objective of the present invention is to provide a conduction-cooling-type super-conducting magnet, wherein a surface pressure is applied between a super-conducting coiled wire portion and a cooling member, the non-uniformity of the surface pressure in the diameter direction of the coiled wire portion has been improved, whereby the uniformity of contact heat resistance has been improved, moreover, warping due to a thermal contraction difference between the cooling member and the coiled wire portion arising at cooling time has been decreased sufficiently, and a surface pressure application mechanism can be installed solely in the low-temperature portion where the super-conducting coiled wire portion is installed.
    Type: Application
    Filed: June 9, 2014
    Publication date: April 27, 2017
    Inventors: Akihisa MIYAZOE, Mitsushi ABE
  • Publication number: 20170092397
    Abstract: An object is to provide a super-conducting coil and a magnetic resonance imaging device that are quench-free by reducing Joule heat generated upon occurrence of separation of members even in a high magnetic field. The super-conducting coil in accordance with the present invention includes a spool and a super-conducting wire wound around the spool. The coil further includes, between the spool and the super-conducting wire, a first resin layer containing thermoplastic resin, a second resin layer containing thermosetting resin, and a mixed layer, the mixed layer being positioned between the first resin layer and the second resin layer and containing a mixture of the thermoplastic resin and the thermosetting resin.
    Type: Application
    Filed: June 17, 2015
    Publication date: March 30, 2017
    Applicant: HITACHI, LTD.
    Inventors: Masahiro KAWASAKI, Kenji OKISHIRO, Tadashi ARAI, Akihisa MIYAZOE
  • Publication number: 20160343491
    Abstract: The superconducting magnet device reduces the number of connections within and/or the number of wires leading out of a superconducting coil winding and promptly starts expending the magnetic energy in a superconducting coil operating in a persistent-current mode when the superconducting coil increases in temperature or transitions to normal conductivity. This invention provides a superconducting magnet device that has the following: a superconducting coil connected to an excitation power supply; a persistent-current switch connected to the superconducting coil; a heater that controls the temperature of the persistent-current switch; a current source that is connected in parallel with the persistent-current switch and has a different polarity from the excitation power supply; a driving circuit connected to the heater and the current source; and a signal-inputting means for inputting a signal to the driving circuit.
    Type: Application
    Filed: January 27, 2014
    Publication date: November 24, 2016
    Inventors: Akihisa MIYAZOE, Takeshi NAKAYAMA, Manabu AOKI
  • Publication number: 20160268028
    Abstract: This superconducting magnet includes: a superconducting coil that is formed by winding a first superconducting wire rod; a second superconducting wire rod, which is disposed by being thermally in contact with and electrically insulated from the superconducting coil, and which has a superconducting transition temperature that is lower than that of the first superconducting wire rod; voltage terminals that are disposed at a plurality of areas of the second superconducting wire rod; a voltmeter connected to the voltage terminals; and a switch circuit connected to the voltmeter. The switch circuit interrupts a current when receiving an output from the voltmeter, the current being one that is to be supplied to the superconducting coil.
    Type: Application
    Filed: November 15, 2013
    Publication date: September 15, 2016
    Inventors: Akihisa MIYAZOE, Takeshi NAKAYAMA, Ryuya ANDO, Manabu AOKI
  • Publication number: 20160225504
    Abstract: A superconducting magnet in which efficiency of conduction cooling is improved is described as well as a magnetic resonance imaging apparatus that includes the superconducting magnet and requires no liquid helium. The magnet resonance imaging apparatus includes: a coil portion including a winding core, a winding portion formed by winding a wire around the winding core, a first flange provided on one side of the winding core, and a second flange provided on the other side of the winding core; a cooling device for cooling the coil portion; and a heat conducting member for thermally connecting the coil portion and the cooling device, in which at least one of the first flange, the second flange, and the winding core has a region made of a material whose thermal contraction rate is larger than a thermal contraction rate of the winding portion.
    Type: Application
    Filed: January 21, 2016
    Publication date: August 4, 2016
    Inventors: Chishin Hori, Manabu Aoki, Akihisa Miyazoe, Yukinobu Imamura