Patents by Inventor Yasumi Nakura

Yasumi Nakura 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: 5155329
    Abstract: In a method for monitoring laser beam welding, a sequential signal representing a laser oscillating wave form is received, light of a predetermined wavelength in the light emitted from the weld zone is received, and the two signals thus received are processed to determine the minimum intensity of the light of the predetermined wavelength and thereby accurately deduce welding beam input and penetration of welding. An apparatus used in practicing the monitoring method includes a monitoring optical fiber for receiving and transmitting the light emitted from a weld being made on a workpiece, an interference filter for selectively passing light of a predetermined wavelength, and a processing device for determining an intensity of the light of the predetermined wavelength.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: October 13, 1992
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kunio Terada, Osa Matsumoto, Yasumi Nakura, Takashi Ishide, Tadashi Nagashima, Shigeo Hashimoto
  • Patent number: 4839495
    Abstract: An improved laser beam welding apparatus for an inner circumferential surface of a tube is disclosed herein, which apparatus comprises an elongated flexible tube containing an optical fiber extended along the length thereof so as to transmit a laser beam, position detecting means disposed in the vicinity of the top end of the flexible tube to determine relative positioning thereof with respect to a work tube in which the flexible tube is inserted, holding means provided with an expander and disposed adjacent to the position detecting means for holding the tip end of the flexible tube in the work tube, rotary drive means disposed closer to the tip end of the flexible tube than the holding means, a rotary cylinder connected to the rotary drive means to be rotated with respect to the flexible tube, guide means mounted on the rotary cylinder in a relatively rotatable manner with respect to the rotary cylinder and held in contact with the inner surface of the work tube for supporting the rotary cylinder in a conce
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: June 13, 1989
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Takuya Kitera, Shoichi Urushibata, Masatoshi Sato, Tadashi Nagashima, Shoichi Hamada, Isao Shirasu, Yasumi Nakura, Michito Sakamoto, Takashi Ishide, Naruo Sakamoto, Masahiko Meka, Masaru Tomeoka