Patents by Inventor Tomotake Yoshida

Tomotake Yoshida 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).

  • Optical fiber with a lens
    Patent number: 7221839
    Abstract: An optical fiber with a lens, obtained by fusion-coupling a multi-mode optical fiber to a tip of a single-mode optical fiber or polarization maintaining optical fiber, and working the tip of the multi-mode optical fiber, to form a spherical portion at the tip. In this case, the radius of curvature of the spherical portion is set to be larger than the maximum value of the expanded spot size. Furthermore, the length of the multi-mode optical fiber is set based on the correlation depending on said length and said radius of curvature for obtaining the minimum spot size at the focal position.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: May 22, 2007
    Assignee: Moritex Corporation
    Inventors: Kazuyoshi Ohta, Tomotake Yoshida
  • Optical fiber with a lens
    Publication number: 20050008310
    Abstract: An optical fiber with a lens, obtained by fusion-coupling a multi-mode optical fiber to a tip of a single-mode optical fiber or polarization maintaining optical fiber, and working the tip of the multi-mode optical fiber, to form a spherical portion at the tip. In this case, the radius of curvature of the spherical portion is set to be larger than the maximum value of the expanded spot size. Furthermore, the length of the multi-mode optical fiber is set based on the correlation depending on said length and said radius of curvature for obtaining the minimum spot size at the focal position.
    Type: Application
    Filed: July 7, 2004
    Publication date: January 13, 2005
    Inventors: Kazuyoshi Ohta, Tomotake Yoshida