Patents by Inventor Yasumoto Kawamura

Yasumoto Kawamura 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 connector and method of and fixture for setting projection length of optical fiber
    Patent number: 6312164
    Abstract: The invention is directed to an optical connector in which a length of an optical fiber 5 projects from a connection end surface (16) of a ferrule (1) is accurately set, a method of and a fixture for setting the projection length of the optical fiber. A recess surface (33) is formed in a ferrule receiving surface (32). A depth of the recess surface (33) is equal to a length an optical fiber (5) projects from the connection end surface (16) of the ferrule (1). The ferrule (1) is held by ferrule holding members (35a) and (35b), so that the ferrule (1) is abutted against the ferrule receiving surface (32) by the urging force of compression springs (36). Through the ferrule (1), an optical fiber cored line (3) is projected from the connection end surface (16) of the ferrule (1) and abutted against the recess surface (33).
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: November 6, 2001
    Assignees: The Furukawa Electric Co., Ltd., Nippon Telegraph and Telephone Company
    Inventors: Yasumoto Kawamura, Takehiro Hayashi, Ken Kanai, Kazuo Hogari, Shinichi Furukawa, Shinji Nagasawa
  • Optical connector and method of and setting projection length of optical fiber
    Patent number: 6234684
    Abstract: The invention is directed to an optical connector in which a length of an optical fiber 5 projects from a connection end surface (16) of a ferrule (1) is accurately set, a method of and a fixture for setting the projection length of the optical fiber. A recess surface (33) is formed in a ferrule receiving surface (32). A depth of the recess surface (33) is equal to a length an optical fiber (5) projects from the connection end surface (16) of the ferrule (1). The ferrule (1) is held by ferrule holding members (35a) and (35b), so that the ferrule (1) is abutted against the ferrule receiving surface (32) by the urging force of compression springs (36). Through the ferrule (1), an optical fiber cored line (3) is projected from the connection end surface (16) of the ferrule (1) and abutted against the recess surface (33).
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: May 22, 2001
    Assignees: The Furukawa Electric Co., Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Yasumoto Kawamura, Takehiro Hayashi, Ken Kanai, Kazuo Hogari, Shinichi Furukawa, Shinji Nagasawa
  • Optical connector and method of and fixture for setting projection length of optical fiber
    Patent number: 6089759
    Abstract: The invention is directed to an optical connector in which a length of an optical fiber 5 projects from a connection end surface (16) of a ferrule (1) is accurately set, a method of and a fixture for setting the projection length of the optical fiber. A recess surface (33) is formed in a ferrule receiving surface (32). A depth of the recess surface (33) is equal to a length an optical fiber (5) projects from the connection end surface (16) of the ferrule (1). The ferrule (1) is held by ferrule holding members (35a) and (35b), so that the ferrule (1) is abutted against the ferrule receiving surface (32) by the urging force of compression springs (36). Through the ferrule (1), an optical fiber cored line (3) is projected from the connection end surface (16) of the ferrule (1) and abutted against the recess surface (33).
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: July 18, 2000
    Assignees: The Furukawa Electric Co. Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Yasumoto Kawamura, Takehiro Hayashi, Ken Kanai, Kazuo Hogari, Shinichi Furukawa, Shinji Nagasawa