Patents by Inventor Kei Sunaga

Kei Sunaga 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: 7512307
    Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: March 31, 2009
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
  • Patent number: 7410303
    Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: August 12, 2008
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
  • Publication number: 20070189682
    Abstract: An optical component as an embodiment of the present invention comprises an optical waveguide. This optical waveguide is a single optical waveguide having a first position and a second position along a longitudinal direction thereof. In this optical waveguide, cross-sectional refractive index profiles vary along the longitudinal direction between the first position and the second position. In this optical waveguide, at a predetermined wavelength to become a single mode at the first position, an overlap rate between a field distribution of light having propagated from the first position and having arrived at the second position, and a Gaussian distribution is not less than 90%.
    Type: Application
    Filed: August 27, 2004
    Publication date: August 16, 2007
    Inventors: Ken Hashimoto, Masaki Ohmura, Kei Sunaga, Shinji Ishikawa, Akira Inoue
  • Publication number: 20060263034
    Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.
    Type: Application
    Filed: July 31, 2006
    Publication date: November 23, 2006
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kakii, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
  • Publication number: 20050123248
    Abstract: An optical connector ferrule molding die 1 for molding an optical connector ferrule having a plurality of optical fiber holes comprises an upper die 10, a lower die 11, and an intermediate die 12, whereas the intermediate die 12 comprises a plurality of optical fiber hole forming pins 126 for forming optical fiber holes. The lower die 11 is provided with a protrusion 114 for forming a window hole of the optical connector ferrule, whereas the optical fiber hole forming pins 126 projecting from the intermediate die 12 are secured by through holes 115 penetrating through the protrusion 114 and V-grooves 113.
    Type: Application
    Filed: November 29, 2002
    Publication date: June 9, 2005
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD
    Inventors: Wataru Sakurai, Hiroshi Katsura, Toshiaki Kaki, Kei Sunaga, Tomohiko Ueda, Toshifumi Hosoya, Daizo Nishioka, Kenichiro Ohtsuka, Yuko Masunaga
  • Patent number: 6345916
    Abstract: The present invention provides a fiber optic connector comprising a fiber pressing member and a substrate having a part A with multiple fiber arranging grooves in which bare portion of optical fibers are fixed, and a part B in which coated portion of optical fibers are fixed, and its manufacturing method. The connector enables to prevent an increase in transmission loss or breakage of the optical fibers by reducing the localized stress on the fibers from the rear end of the fiber pressing member and the rear end edge of the fiber arranging grooves.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: February 12, 2002
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Dai Yui, Kei Sunaga, Teruo Ikechi, Hidetoshi Ishida, Manabu Shiozaki, Takashi Sasaki, Kohei Kobayashi
  • Patent number: 6299361
    Abstract: The invention has an object to provide a method of making an optical fiber array in which bare fibers obtained by removing a coating of an optical fiber ribbon can be certainly arrayed on a V-groove substrate. A first feature of the invention is to use a positioning guide, and the positioning guide is provided with a recess portion having inclined wall surfaces, and its bottom portion is made to have a width equal to the whole width of the bare fibers in an arrayed state. By using this positioning guide, the optical fiber array can be made in a process as follows. In a state where bare fibers exposed by removing part of coating of tip portions of two fiber ribbons are alternately arranged, the positioning guide is raised from below. The bare fibers with irregular gaps are moved by the positioning guide and are arranged. In this state, the bare fibers are pressed by a fiber pressing member from above, and the V-groove substrate is raised, so that they are put on V grooves and are fixed by an adhesive.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: October 9, 2001
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Sasaki, Teruaki Nishida, Hidetoshi Ishida, Dai Yui, Kei Sunaga