Patents by Inventor Junichi Chikawa

Junichi Chikawa 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: 6931099
    Abstract: The present invention relates to a high-energy X-ray imaging device that is suitable for precise medical diagnosis and capable of enhancing the accuracy of nondestructive examinations. The high-energy X-ray imaging device of the present invention includes an electron-circulating type high luminance X-ray generator and a two-dimensional X-ray detector that is sensitized for high-energy X-rays. The electron-circulating type X-ray generating device consists of a tinytarget together with a LINAC or microtron injector and a synchrotron. The synchrotron stores electrons, and electrons are bombarded against a tinytarget placed on the electron orbit to generate high-energy X-rays. The means to sensitize the two-dimensional X-ray detectors consists of a thin film made of lead or other heavy elements. This thin film is placed in front of and in close contact with the two-dimensional detector, such as X-ray film. The X-ray image thus generated is a transmissive image.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: August 16, 2005
    Assignee: Photon Production Laboratory Ltd.
    Inventors: Hironari Yamada, Isao Tooyama, Yasuji Kitazawa, Junichi Chikawa
  • Publication number: 20040013233
    Abstract: The present invention relates to a high-energy X-ray imaging device that is suitable for precise medical diagnosis and capable of enhancing the accuracy of nondestructive examinations. The high-energy X-ray imaging device of the present invention comprises an electron-circulating type high luminance X-ray generator and a two-dimensional X-ray detector that is sensitized for high-energy X-rays. The electron-circulating type X-ray generating device consists of a tinytarget together with a LINAC or microtron injector and a synchrotron. The synchrotron stores electrons, and electrons are bombarded against a tinytarget placed on the electron orbit to generate high-energy X-rays. The means to sensitize the two-dimensional X-ray detectors consists of a thin film made of lead or other heavy elements. It is placed in front of and in close contact with the two-dimensional detector, such as X-ray film. The X-ray image thus generated is a transmissive image.
    Type: Application
    Filed: April 11, 2003
    Publication date: January 22, 2004
    Inventors: Hironari Yamada, Isao Tooyama, Yasuji Kitazawa, Junichi Chikawa
  • Patent number: 3944823
    Abstract: An X-ray topograph reproducing apparatus is provided whereby the X-ray topograph throughout the total surface of a specimen crystal may be reproduced in positive and rapid succession. The reproduction of the X-ray topograph is effected by providing means for rotating the crystal in a horizontal direction while being moved in parallel with a given direction. The X-ray topograph at one point on the crystal obtained by an incident X-ray having different wave lengths is always reproduced at the same position on a record surface by providing means for maintaining the amount of movement of the record surface with respect to the amount of movement of the crystal at a given ratio and by providing means for recording or indicating an image reproducing output signal in one or two dimensional manner by both of a signal of detecting the amount of movement of the crystal and a signal associated with scanning in the lengthwise direction of slits through which pass the X-ray.
    Type: Grant
    Filed: July 15, 1974
    Date of Patent: March 16, 1976
    Assignee: Nippon Hoso Kyokai
    Inventor: Junichi Chikawa