Patents by Inventor Akinori Yamasaki

Akinori Yamasaki 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: 5631944
    Abstract: The rotary cathode X-ray tube equipment of present invention is constructed so as to permit radiation of X-ray from all directions with respect to the whole circumference of a subject, and is used for x-ray CT. The equipment of the invention is constructed to prevent an X-ray radiation window 40 of a low strength from being influenced by atmospheric deformations of a vacuum vessel 1 or by machining and assembling errors, for example by using a joint portion disposed between the X-ray radiation window and an inner ring and having both a surface perpendicular to a rotational axis of a rotary member and a cylindrical surface parallel to the rotational axis, a face seal formed on the surface of the joint portion perpendicular to the rotational axis, and an axial seal formed on the cylindrical surface of the joint portion parallel to the rotational axis.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: May 20, 1997
    Assignees: Shimadzu Corporation, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yutaro Kimura, Tetsuhiko Ikeshima, Hiromichi Tonami, Ikuo Konishi, Hiroshi Horikawa, Akihiro Daikoku, Shigekazu Sakabe, Masao Inoue, Akinori Yamasaki
  • Patent number: 5592526
    Abstract: The rotary cathode X-ray tube equipment of the present invention is constructed so as to permit radiation of X-ray from all directions with respect to the whole circumference of a subject, and is used for x-ray CT. The equipment of the invention is constructed to prevent an X-ray radiation window 40 of a low strength from being influenced by atmospheric deformations of a vacuum vessel 1 or by machining and assembling errors, for example by using a joint portion disposed between the X-ray radiation window and an inner ring and having both a surface perpendicular to a rotational axis of a rotary member and a cylindrical surface parallel to the rotational axis, a face seal formed on the surface of the joint portion perpendicular to the rotational axis, and an axial seal formed on the cylindrical surface of the joint portion parallel to the rotational axis.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: January 7, 1997
    Assignees: Shimadzu Corporation, Mitsubishi Denki Kabushiki Kaishi
    Inventors: Akihiro Daikoku, Shigekazu Sakabe, Masao Inoue, Akinori Yamasaki
  • Patent number: 5548629
    Abstract: The rotary cathode X-ray tube equipment of the present invention is constructed so as to permit radiation of X-ray from all directions with respect to the whole circumference of a subject, and is used for x-ray CT. The equipment of the invention is constructed to prevent an X-ray radiation window 40 of a low strength from being influenced by atmospheric deformations of a vacuum vessel 1 or by machining and assembling errors, for example by using a joint portion disposed between the X-ray radiation window and an inner ring and having both a surface perpendicular to a rotational axis of a rotary member and a cylindrical surface parallel to the rotational axis, a face seal formed on the surface of the joint portion perpendicular to the rotational axis, and an axial seal formed on the cylindrical surface of the joint portion parallel to the rotational axis.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: August 20, 1996
    Assignees: Shimadzu Corporation, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yutaro Kimura, Tetsuhiko Ikeshima, Hiromichi Tonami, Ikuo Konishi, Hiroshi Horikawa, Akihiro Daikoku, Shigekazu Sakabe, Masao Inoue, Akinori Yamasaki
  • Patent number: 5481585
    Abstract: The rotary cathode X-ray tube equipment of the present invention is constructed so as to permit radiation of X-ray from all directions with respect to the whole circumference of a subject, and is used for x-ray CT. The equipment of the invention is constructed to prevent an X-ray radiation window 40 of a low strength from being influenced by atmospheric deformations of a vacuum vessel 1 or by machining and assembling errors, for example by using a joint portion disposed between the X-ray radiation window and an inner ring and having both a surface perpendicular to a rotational axis of a rotary member and a cylindrical surface parallel to the rotational axis, a face seal formed on the surface of the joint portion perpendicular to the rotational axis, and an axial seal formed on the cylindrical surface of the joint portion parallel to the rotational axis.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: January 2, 1996
    Assignees: Shimadzu Corporation, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yutaro Kimura, Tetsuhiko Ikeshima, Hiromichi Tonami, Ikuo Konishi, Hiroshi Horikawa, Akihiro Daikoku, Shigekazu Sakabe, Masao Inoue, Akinori Yamasaki
  • Patent number: 5216568
    Abstract: A superconducting magnet device which is capable of protecting at the time of quenching a superconducting magnet divided into a plurality of sections comprises a superconducting magnet circuit which is formed by sequentially connecting in series coil pairs 1a, 1b, and 2a, 2b which are positioned symmetrically with respect to a ferromagnetic shield 6, and by connecting in parallel to the superconducting coils 1a, 1b and 2a, 2b superconducting coil protecting elements 3a and 3b which protect the superconducting coils 1a, 1b and 2a, 2b when the voltage at the ends of the coils has exceeded a predetermined value. If quenching occurs at the superconducting coils 1a, 1b and 2a, 2b, generation of an unbalanced electromagnetic force, a local electromagnetic force, etc., against the ferromagnetic shield 6 is prevented, so that the support structure for the superconducting coils and the ferromagnetic shield can be simplified.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: June 1, 1993
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akihiro Harada, Akinori Yamasaki, Tatsuya Oue
  • Patent number: 5084955
    Abstract: A method for manufacturing a superconducting magnet comprising the steps of applying a bonding agent on a length of a superconductor by passing the superconductor through a bath of the bonding agent to thereby coat the superconductor with the bonding agent. The superconductor coated with the bonding agent is simultaneously wound to form a winding which is then hardened by heating for example to form a rigid winding without voids.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: February 4, 1992
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Yamasaki, Akihiro Harada, Teruo Miyamoto
  • Patent number: 4912445
    Abstract: An electromagnet comprising a magnetic field coil and a substantially cylindrical magnetic shield coaxially disposed around the field coil for defining a magnetic circuit therearound. The magnetic shield comprises a hollow cylindrical magnetic yoke with ring-shaped end plates at its opposite ends. The magnetic yoke's cylindrical wall has a cross-sectional area effective for accommodating the magnetic flux generated by the magnetic field coil. The magnetic yoke has a pair of thicker wall sections at first diametrically opposite positions, and a pair of thinner wall sections a second diametrically opposite positions separated by 90 degrees from the first diametrically opposite positions. The thicker and the thinner wall sections are thicker and thinner, respectively, than a mean required wall thickness which is a wall thickness necessary for providing to the magnetic yoke a cross-sectional area for effectively accommodating the magnetic flux generated by the magnetic field coil.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: March 27, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Yamasaki, Tatsuya Oue
  • Patent number: 4868531
    Abstract: In a superconducting magnet apparatus comprising a liquid helium container accommodating a superconducting magnet in liquid helium and a vacuum insulating vessel surrounding the liquid helium container via a vacuum layer, the improvement wherein power supply leads inserted into a wiring tube fitted through the vacuum insulation vessel and the liquid helium container are formed of a superconductor having a critical temperature not lower than the temperature of liquid nitrogen.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: September 19, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Yamasaki, Sigenori Kuroda, Tatsuya Oue