Patents by Inventor Isamu Oishi

Isamu Oishi 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: 6349162
    Abstract: Disclosed is a field distribution converting optical fiber which can be massproduced and enables mutual conversion elliptical field distribution to circular field distribution or vice versa, and a laser diode module in which the field distribution converting optical fiber is used. The optical axis is assumed to be Z, either of the refractive index profiles of a core in the X and Y directions of the orthogonal three axes X, Y and Z is made into a square-law distribution profile, a slope of the refractive index profile in the corresponding X direction is made different from a slope of the refractive index profile in the Y direction. The optical axis propagating in the XZ and XY planes is caused to cyclically change in the Z direction, wherein these cycles are made different from each other to cause the cross-sectional profile of the field distribution of the optical fiber to be cyclically changed.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: February 19, 2002
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Kazuo Shiraishi, Isamu Oishi
  • Patent number: 5861637
    Abstract: A surface-mounted module (1) having an optical semiconductor device (5) and an optical fiber (6) mounted on a substrate (2) and a method of producing the surface mounted-module. The substrate (2) of the surface-mounted module (1) comprises a base component (3), which has marks (3b) indicative of the mounting position for an optical semiconductor device and a positioning section (3c) for positioning an optical fiber and is formed by a precision transfer process, and a molded body (4) joined integrally to the base component.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: January 19, 1999
    Assignee: The Furukawa Electric Co., Ltd.
    Inventor: Isamu Oishi
  • Patent number: 5446816
    Abstract: An optical fiber having a lens formed at an end thereof comprises a fiber body including a core and a cladding, and an incident light guide portion having a uniform refractive index and integrally formed at an end portion of the fiber body, wherein the incident light guide portion has a convex surface, and the core has a distal end located within the incident light guide portion at a position close to a focal point of the incident light guide portion.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: August 29, 1995
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Kazuo Shiraishi, Kazuhito Matsumura, Isamu Oishi, Katsuo Ebine
  • Patent number: 3974467
    Abstract: A long flexible waveguide is fabricated by corrugating a thin-walled tube circular in section and then molding the corrugated tube so as to make the shape of its section substantially rectangular. The long flexible waveguide has a substantially rectangular section wherein a corrugating pitch P falls within a range of .lambda..sub.g /10<P<2 K.sqroot.D.sup.. t where .lambda..sub.g denotes a wavelength in the waveguide, K a constant, D an outer diameter of the tube before the corrugation, and t a thickness of the wall of said tube, and wherein a radius of curvature R of each inside corner of the molded tube falls within a range of h .ltoreq.R .ltoreq.0.46 b where h denotes a depth of the corrugate form of said tube, and b a dimension of said tube on the side of a minor axis of said section. Rectangular waveguide thus fabricated has excellent electric characteristics and is produced under good working conditions.
    Type: Grant
    Filed: May 29, 1975
    Date of Patent: August 10, 1976
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Susumu Tobita, Masashi Shimoishizaka, Isamu Oishi, Keiichi Miwa, Hideo Kanda
  • Patent number: 3945552
    Abstract: A method and apparatus for forming a corrugated waveguide which has pairs of sub-blocks for forming the corrugated metal tube into the desired shape repeatedly by mating the sub-blocks, separating and advancing them intermittently so that the desired elliptic section or predetermined shape of section of the corrugated tube may be gradually approximated.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: March 23, 1976
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Susumu Tobita, Masashi Shimoishizaka, Yuzo Sumita, Isamu Oishi, Koji Kato