Patents by Inventor Junichi Asama

Junichi Asama 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).

  • Publication number: 20170324304
    Abstract: In an electric motor, a magnetic bearing generates an electromagnetic force between multiple permanent magnets and a coil and rotatably supports an other side of a rotation shaft in an axis line direction. The rotation shaft is configured to be capable of being inclined with a rotation center line using a bearing side of the rotation shaft as a fulcrum. An electronic control device controls a current that flows to the coil such that an axis line of the rotation shaft approaches the rotation center line due to a supporting force which is the electromagnetic force between the multiple permanent magnets and the coil. Accordingly, the rotation shaft is rotatably supported to be freely rotatable by a magnetic bearing and the bearing.
    Type: Application
    Filed: October 29, 2015
    Publication date: November 9, 2017
    Inventors: Koji ITO, Masanori YASUDA, Shinji MAKITA, Jun YAMAOKA, Masao TOKUNAGA, Etsuro YOSHINO, Junichi ASAMA
  • Patent number: 9450469
    Abstract: An inchworm actuator which can move a movable body relative to a stationary body while selectively giving priority to displacement speed or displacement resolution in accordance with the conditions of use is provided. An inchworm actuator 100 includes a movable body 110 supported between first and second guides 101 and 102 which are made of a magnetic material and which extend parallel to each other. In the movable body 110, a voice coil motor 115 is supported by first and second support legs 111 and 112 through toggle mechanisms 116a and 116b. The first and second support legs 111 and 112 are made of a magnetic material and have magnetic field-forming coils 113 and 114. The toggle mechanisms 116a and 116b convert the amount of displacement input from the voice coil motor 115 using a reducing conversion ratio corresponding to the amount of the displacement and transmit a resultant displacement to the first and second support legs 111 and 112.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: September 20, 2016
    Assignee: National University Corporation Shizuoka University
    Inventors: Takaaki Oiwa, Junichi Asama
  • Publication number: 20130334902
    Abstract: An inchworm actuator which can move a movable body relative to a stationary body while selectively giving priority to displacement speed or displacement resolution in accordance with the conditions of use is provided. An inchworm actuator 100 includes a movable body 110 supported between first and second guides 101 and 102 which are made of a magnetic material and which extend parallel to each other. In the movable body 110, a voice coil motor 115 is supported by first and second support legs 111 and 112 through toggle mechanisms 116a and 116b. The first and second support legs 111 and 112 are made of a magnetic material and have magnetic field-forming coils 113 and 114. The toggle mechanisms 116a and 116b convert the amount of displacement input from the voice coil motor 115 using a reducing conversion ratio corresponding to the amount of the displacement and transmit a resultant displacement to the first and second support legs 111 and 112.
    Type: Application
    Filed: September 22, 2011
    Publication date: December 19, 2013
    Inventors: Takaaki Oiwa, Junichi Asama
  • Patent number: 8596999
    Abstract: A disposable centrifugal blood pump with magnetic coupling provides a centrifugal blood pump with magnetic coupling which is simple in structure of disposable parts with low cost. Therefore, a housing as the disposable part includes a rotor having pole faces extending on the outer-peripheral surface and projecting inward from the inner-peripheral surface and an impeller attached to the rotor, and a stator as a reusable part includes three or more electromagnets for electromagnetic coupling for forming a magnetic coupling between the stator and the rotor, a torque transmission disk formed by sandwiching a ring-shaped permanent magnet between two upper and lower ring members and having pole faces corresponding to the pole faces projecting from the inner-peripheral surface of the rotor formed to project for generating a magnetic coupling between stator and rotor, a motor for rotating the torque transmission disk, and a displacement gauge for measuring displacement of the rotor.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: December 3, 2013
    Assignees: Tokyo Institute of Technology, Tokyo Medical and Dental University
    Inventors: Tadahiko Shinshi, Akira Shimokohbe, Junichi Asama, Chikara Hara, Wataru Hijikata, Setsuo Takatani, Hideo Hoshi
  • Publication number: 20120207630
    Abstract: A disposable centrifugal blood pump with magnetic coupling provides a centrifugal blood pump with magnetic coupling which is simple in structure of disposable parts with low cost. Therefore, a housing as the disposable part includes a rotor having pole faces extending on the outer-peripheral surface and projecting inward from the inner-peripheral surface and an impeller attached to the rotor, and a stator as a reusable part includes three or more electromagnets for electromagnetic coupling for forming a magnetic coupling between the stator and the rotor, a torque transmission disk formed by sandwiching a ring-shaped permanent magnet between two upper and lower ring members and having pole faces corresponding to the pole faces projecting from the inner-peripheral surface of the rotor formed to project for generating a magnetic coupling between stator and rotor, a motor for rotating the torque transmission disk, and a displacement gauge for measuring displacement of the rotor.
    Type: Application
    Filed: February 15, 2012
    Publication date: August 16, 2012
    Applicants: TOKYO MEDICAL AND DENTAL UNIVERSITY, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Tadahiko Shinshi, Akira Shimokohbe, Junichi Asama, Chikara Hara, Wataru Hijikata, Setsuo Takatani, Hideo Hoshi
  • Patent number: 8123503
    Abstract: A disposable centrifugal blood pump with magnetic coupling provides a centrifugal blood pump with magnetic coupling which is simple in structure of disposalable parts with low cost. Therefore, a housing as the disposable part includes a rotor having pole faces extending on the outer-peripheral surface and projecting inward from the inner-peripheral surface and an impeller attached to the rotor, and a stator as a reusable part includes three or more electromagnets for electromagnetic coupling for forming a magnetic coupling between the stator and the rotor, a torque transmission disk formed by sandwiching a ring-shaped permanent magnet between two upper and lower ring members and having pole faces corresponding to the pole faces projecting from the inner-peripheral surface of the rotor formed to project for generating a magnetic coupling between stator and rotor, a motor for rotating the torque transmission disk, and a displacement gauge for measuring displacement of the rotor.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: February 28, 2012
    Assignees: Tokyo Institute of Technology, Tokyo Medical and Dental University
    Inventors: Tadahiko Shinshi, Akira Shimokohbe, Junichi Asama, Chikara Hara, Wataru Hijikata, Setsuo Takatani, Hideo Hoshi
  • Publication number: 20100040491
    Abstract: A disposable centrifugal blood pump with magnetic coupling provides a centrifugal blood pump with magnetic coupling which is simple in structure of disposable parts with low cost. Therefore, a housing as the disposable part includes a rotor having pole faces extending on the outer-peripheral surface and projecting inward from the inner-peripheral surface and an impeller attached to the rotor, and a stator as a reusable part includes three or more electromagnets for electromagnetic coupling for forming a magnetic coupling between the stator and the rotor, a torque transmission disk formed by sandwiching a ring-shaped permanent magnet between two upper and lower ring members and having pole faces corresponding to the pole faces projecting from the inner-peripheral surface of the rotor formed to project for generating a magnetic coupling between stator and rotor, a motor for rotating the torque transmission disk, and a displacement gauge for measuring displacement of the rotor.
    Type: Application
    Filed: September 1, 2006
    Publication date: February 18, 2010
    Applicants: Tokyo Institute of Technology, Tokyo Medical and Dental University
    Inventors: Tadahiko Shinshi, Akira Shimokohbe, Junichi Asama, Chikara Hara, Wataru Hijikata, Setsuo Takatani, Hideo Hoshi