Patents by Inventor Tomohiko Ueda

Tomohiko Ueda 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: 6193421
    Abstract: A short optical fiber 2 is incorporated in a ferrule 1 having a polished front end, so as to be projected from the rear end of the ferrule. In a base member 3 in which the short optical fiber is to be fitted into a hole 3b, a V-groove 3d to which the glass portion of an optical fiber is to be fixed, and a V-groove 3e to which the coated portion is to be fixed are formed. A cover member 4 is placed on the base member. The base member 3 and the cover member 4 are clamped by clamp members 5a and 5b and the base member 3 presses to V-grooves. Wedges which are not shown are pressingly inserted between recessed 3g and 4c, and 3h and 4d, and an optical fiber 10 is inserted from the rear portion. Thereafter, the wedges are detached and the optical connector is attached to the terminal of the optical fiber 10.
    Type: Grant
    Filed: August 25, 1999
    Date of Patent: February 27, 2001
    Assignees: Sumitomo Electric Industries, Ltd, Nippon Telegraph and Telephone Corporation
    Inventors: Yoshikyo Tamekuni, Tomohiko Ueda, Kazuo Hogari, Shin-ichi Furukawa
  • Patent number: 6095695
    Abstract: An optical connector includes a first ferrule which holds the ends of a first optical fiber unit including at least one optical fiber, and a housing. The housing is a U-shaped member with parallel arms extending in the lengthwise direction of the first optical fiber unit. The housing surrounds one of the widthwise sides of the first ferrule from which the first optical fiber unit is derived and the lengthwise sides of the first ferrule, whereby the housing accommodates the first ferrule. The housing receives a second ferrule which holds the ends of a second optical fiber unit including at least one optical fiber through the U-shaped opening. The housing surrounds the lengthwise side of the second ferrule and a part of the side of the second ferrule from which the second optical fiber unit is derived, whereby the first and second ferrules are coupled together.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: August 1, 2000
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kenichiro Ohtsuka, Tomohiko Ueda, Toshiaki Kakii
  • Patent number: 6062740
    Abstract: An optical connector in which an optical fiber is fixed within a ferrule such that a tip of the optical fiber is disposed at a front end face position of the ferrule. An optical-fiber-positioning hole formed so as to directly extend into the ferrule from an optical connecting orifice formed in the front end face of the ferrule has a diameter greater than a diameter of the optical fiber positioned within the optical-fiber-positioning hole, the optical-fiber-positioning hole having therein a compressible unfixing area for allowing the optical fiber to compress along the optical-fiber-positioning hole, and a fixing area, disposed behind the compressible unfixing area, for fixing the optical fiber to the ferrule.
    Type: Grant
    Filed: August 25, 1998
    Date of Patent: May 16, 2000
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kenichiro Ohtsuka, Tomohiko Ueda, Toshiaki Kakii, Hiroshi Katsura
  • Patent number: 5993070
    Abstract: A short optical fiber 2 is incorporated in a ferrule 1 having a polished front end, so as to be projected from the rear end of the ferrule. In a base member 3 in which the short optical fiber is to be fitted into a hole 3b, a V-groove 3d to which the glass portion of an optical fiber is to be fixed, and a V-groove 3e to which the coated portion is to be fixed are formed. A cover member 4 is placed on the base member. The base member 3 and the cover member 4 are clamped by clamp members 5a and 5b and the base member 3 presses the V-grooves. Wedges which are not shown are pressingly inserted between recesses 3g and 4c, and 3h and 4d, and an optical fiber 10 is inserted from the rear portion. Thereafter, the wedges are detached and the optical connector is attached to the terminal of the optical fiber 10.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: November 30, 1999
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Yoshikyo Tamekuni, Tomohiko Ueda, Kazuo Hogari, Shin-ichi Furukawa
  • Patent number: 5862282
    Abstract: An optical connector that can stably connect even a tension-resistant jacket-covered optical fiber cord is provided. In an optical connector, which includes an optical connector plug 10 having a ferrule 14 holding an optical fiber and a housing 16 accommodating the ferrule, and an adapter connecting the optical connector plugs; the optical fiber is an optical fiber cord 12 in which at least the jacket carries tension, a secondary coated optical fiber (120) and the jacket (123) carrying the tension of the optical fiber cord 12 are secured to the ferrule 14, and the ferrule 14 is immovably mounted to the housing 16.
    Type: Grant
    Filed: June 17, 1997
    Date of Patent: January 19, 1999
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corp.
    Inventors: Ichiro Matsuura, Tomohiko Ueda, Toru Yamanishi, Shinji Nagasawa
  • Patent number: 5619605
    Abstract: A novel optical connector that includes the following: an optical connector ferrule which is capable of fixing optical fibers; optical fibers fixed onto the optical connector ferrule, such that the end surfaces of the optical fibers project beyond an end surface of the optical connector ferrule; an adhesive for fixing the optical fibers onto the optical connector ferrule; and a member whose Young's Modulus is less than that of the optical fiber and is provided to an area on the end surface of the optical connector ferrule surrounding, at a minimum, the projected portions of the optical fibers. And when the end surface of the optical connector is polished, the ends of the optical fibers are capable of projecting from the end surface of the optical connector ferrule, even if the end surface portion of the optical connector ferrule contains a filler, the hardness of which is less than that of the optical fibers.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: April 8, 1997
    Assignees: Sumitomo Electric Industries, Ltd, Nippon Telegraph & Telephone Corporation
    Inventors: Tomohiko Ueda, Ichiro Matsuura, Makoto Honjo, Toshiaki Kakii, Toru Yamanishi, Shinji Nagasawa
  • Patent number: 5602951
    Abstract: The ferrule for optical connector according to this invention comprises a first grip portion having first through holes for insertion of optical fibers and gripping part of said optical fibers apart a predetermined distance from the distal ends of optical fibers; a second grip portion arranged along the insertion direction of optical fibers together with the first grip portion and opposed to the first grip portion through a first space. The second grip portion has second through holes for the optical fibers set through the first through holes to be further introduced therethrough, and grips the vicinity of the distal ends of optical fibers; and a pedestal portion projecting from a surface of the first grip portion.
    Type: Grant
    Filed: April 14, 1995
    Date of Patent: February 11, 1997
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph & Telephone Corporation
    Inventors: Tetsuo Shiota, Yoshikyo Tamekuni, Tomohiko Ueda, Ichiro Tsuchiya, Toshiaki Kakii, Shinji Nagasawa
  • Patent number: 5519800
    Abstract: A novel optical connector that includes the following: a optical connector ferrule which is capable of fixing optical fibers; optical fibers fixed onto the optical connector ferrule, such that the end surfaces of the optical fibers project beyond an end surface of the optical connector ferrule; an adhesive for fixing the opticalfibers onto the optical connector ferrule; and a member whose Young's Modulus is less than that of the optical fiber and is provided to an area on the end surface of the optical connector ferrule surronding, at a minimum, the projected portions of the optical fibers. And when the end surface of the optical connector is polished, the ends of the optical fibers are capable of projecting from the end surface of the optical connector ferrule, even if the end surface portion of the optical connector ferrule contains afiller, the hardness of which is less than that oaf the optical fibers.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: May 21, 1996
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph & Telephone Corporation
    Inventors: Tomohiko Ueda, Ichiro Matsuura, Makoto Honjo, Toshiaki Kakii, Toru Yamanishi, Shinji Nagasawa
  • Patent number: 5422971
    Abstract: The present invention relates to an adhesive for connecting and fixing an optical fiber to an optical connector and to an optical connector which uses that adhesive. The adhesive prevents deformation of the optical connector ferrule and stressing of the optical fiber due to hardening shrinkage during the hardening of the adhesive and/or a shrinkage during cooling of the adhesive. In accordance with the invention, (1) the value of (the coefficient of linear expansion (.degree.C..sup.-1) of the adhesive).times.(the difference between a hardening temperature of the adhesive and room temperature (.degree.C.)).times.(Young's Modulus (kg/mm.sup.2) of the adhesive) is equal to or less than about 2.5, (2) the value of (the rate of hardening shrinkage (%) of the adhesive).times.(Young's Modulus (kg/mm.sup.2) of the adhesive) is equal to or less than about 1000 and/or (3) the adhesive hardens at room temperature.
    Type: Grant
    Filed: February 1, 1994
    Date of Patent: June 6, 1995
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Makoto Honjo, Hiroshi Katsura, Tomohiko Ueda, Toru Yamanishi
  • Patent number: 5268986
    Abstract: A redundant length treatment mechanism for an optical fiber which is stored in an optical cable and has one end connected to an optical connector, includes a storage case in which a redundant part of the optical fiber exposed from the optical cable is stored while wound up in a loop form, a bent form or an S-shape form, the storage case having a draw-out portion through which one end portion of the looped optical fiber is drawn out, and curvature restricting means comprising a pair of stoppers secured to the optical fiber for restricting radius of curvature of the optical fiber stored in a loop form in the storage case.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: December 7, 1993
    Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Toshiaki Kakii, Hidetoshi Ishida, Tomohiko Ueda, Kyoji Maruyama, Tadashi Haibara, Shigeru Tomita