Patents by Inventor Kunihiko Fujiwara

Kunihiko Fujiwara 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).

  • Publication number: 20230271579
    Abstract: A power conversion apparatus includes a hermetic housing, a power semiconductor module, and dry gas. The hermetic housing includes a gas inlet valve and a gas outlet valve. The power semiconductor module is arranged in an internal space in the hermetic housing. The internal space in the hermetic housing is filled with dry gas.
    Type: Application
    Filed: September 7, 2020
    Publication date: August 31, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Junichi NAKASHIMA, Kenji FUJIWARA, Kozo HARADA, Kunihiko TAJIRI, Yuji SHIRAKATA
  • Publication number: 20230180377
    Abstract: A cleaning tool includes: a tool body; and an extension part extending from the tool body and including a head configured to press a cleaning body against a cleaning target. The head includes a conductor part made of a conductor.
    Type: Application
    Filed: April 13, 2021
    Publication date: June 8, 2023
    Applicant: Fujikura Ltd.
    Inventors: Yuya Sakaguchi, Shunsuke Fujita, Kunihiko Fujiwara
  • Publication number: 20220397724
    Abstract: A cleaning tool includes: a head including: a pressing part that presses a cleaning element against an object to be cleaned in a pressing direction, and having a first dimension in a width direction orthogonal to the pressing direction; and a neck part having a second dimension smaller than the first dimension in the width direction; and a housing that houses the head such that the pressing part and the neck part protrude from the housing in the pressing direction. A length of the housing in the width direction is equal to or greater than a length of protrusion of the pressing part protruding from the housing in the pressing direction.
    Type: Application
    Filed: April 7, 2021
    Publication date: December 15, 2022
    Applicant: FUJIKURA LTD.
    Inventors: Shunsuke Fujita, Kunihiko Fujiwara
  • Publication number: 20220276448
    Abstract: A cleaning tool includes: a head; and a cleaning body wrapped around the head. The head includes: a head body; and a projection that projects from the head body. The projection is retractable relative to the head body. The head may further include an elastic member that restores a positional relationship between the projection and the head body.
    Type: Application
    Filed: August 20, 2020
    Publication date: September 1, 2022
    Applicant: Fujikura Ltd.
    Inventors: Shunsuke Fujita, Kunihiko Fujiwara, Masashi Ohshima
  • Publication number: 20220229245
    Abstract: An optical connector includes optical fibers, a ferrule, and a pitch fixing member. The optical fibers have bare parts where coating parts have been stripped off. The ferrule has insertion holes, and the bare parts are inserted into the insertion holes. The pitch fixing member is inserted into the ferrule and has fixing parts that fix a pitch of the coating parts of the optical fibers to a pitch of the insertion holes.
    Type: Application
    Filed: July 10, 2020
    Publication date: July 21, 2022
    Applicant: Fujikura Ltd.
    Inventors: Shuhei Kanno, Takahito Otomitsu, Kunihiko Fujiwara
  • Patent number: 11294125
    Abstract: An optical connector includes: a housing that retractably accommodates a ferrule; a spring that is accommodated in the housing to press the ferrule to a front side; and an engaging member connected to one end of the spring, fixed to the housing by engaging with the housing, and including a pair of arm parts arranged to sandwich the spring. When a direction perpendicular to a direction in which the spring presses the ferrule and to a direction in which the pair of arm parts is lined up is an up-down direction, window parts are arranged on both sides in the up-down direction of the housing. The engaging member includes: claw parts that are provided on an upper and a lower side of the pair of arm parts to engage with the window parts; and deformation parts that allow the claw parts to be displaced in the up-down direction.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: April 5, 2022
    Assignee: FUJIKURA LTD.
    Inventors: Shunsuke Fujita, Takahito Otomitsu, Shuhei Kanno, Kunihiko Fujiwara
  • Publication number: 20220082758
    Abstract: An optical fiber alignment tool includes a fiber aligner that includes: separators that assort optical fibers; and fiber insertion portions each disposed between a respective pair of the separators and that align the optical fibers in an alignment direction in a predetermined order when the optical fibers are inserted into the fiber insertion portion; and a fiber holding portion that includes a mount surface on which the optical fibers are mounted. The fiber aligner and the fiber holding portion are relatively movable in the alignment direction of the optical fibers.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 17, 2022
    Applicant: FUJIKURA LTD.
    Inventors: Thao Thi Thanh Nguyen, Junya Watanabe, Kunihiko Fujiwara
  • Publication number: 20220082819
    Abstract: An attachment cleaning tool includes: a cleaning tool; and an attachment detachably attached to the cleaning tool. The cleaning tool includes: cleaning bodies that clean connection end surfaces of ferrules of an optical connector; head members each that press the cleaning bodies against the connection end surfaces; nozzle members that respectively accommodate the head members; a feeding mechanism that supplies and withdraws the cleaning bodies with respect to the head members; and an accommodating body which accommodates the feeding mechanism. Each of the connection members of the attachment includes: an attachment portion attached to a tip portion of each of the nozzle members; and a tubular portion that protrudes from the attachment portion in a longitudinal direction of the nozzle members and into which one of the ferrules is inserted. The connection members move following a relative movement of the nozzle members in the lateral direction.
    Type: Application
    Filed: March 31, 2020
    Publication date: March 17, 2022
    Applicant: Fujikura Ltd.
    Inventors: Shunsuke Fujita, Junichi Nakane, Kunihiko Fujiwara
  • Patent number: 11275218
    Abstract: An optical connector includes: a ferrule including a guide pin hole, a plurality of fiber holes lined up in a width direction of the optical fiber, and an inclined end face; a housing in which the ferrule is retractably housed; and an application part that applies an upward force to the ferrule in an upward/downward direction when the optical connector connects with a counterpart connector in a connecting/disconnecting direction. The upward/downward direction is a height direction of the optical connector and is orthogonal to both the connecting/disconnecting direction and the width direction. The inclined end face projects upward toward the counterpart connector.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: March 15, 2022
    Assignee: FUJIKURA LTD.
    Inventors: Takahito Otomitsu, Shuhei Kanno, Shunsuke Fujita, Kunihiko Fujiwara
  • Patent number: 11262503
    Abstract: A fiber cutter includes: a base including a fiber grip that grips an optical fiber; a slider including a fiber end grip that grips an end portion of the optical fiber, wherein the slider moves relative to the base; a cut former including a blade forming an initial cut in the optical fiber and disposed between the fiber grip and the fiber end grip; and a spring that applies a force between the base and the slider to apply a tension to the optical fiber gripped by the fiber grip and the fiber end grip, wherein the cut former is disposed on the slide, and when the initial cut grows and the optical fiber cleaves, the cut former moves together with the slider by the force of the spring.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: March 1, 2022
    Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takaharu Matsuda, Kunihiko Fujiwara, Ryo Koyama, Mitsuru Kihara
  • Publication number: 20220050250
    Abstract: A connector system includes: a first ferrule configured to hold end parts of multi-core fibers; a second ferrule configured to hold end parts of single-core fibers; and an optical connection member. The optical connection member is arranged between the first and the second ferrule, and includes an optical system configured to optically connect respective cores included in the multi-core fibers and the single-core fibers. A guide pin is formed on one of the first and the second ferrule, and a guide hole is formed in another of the first and the second ferrule. A through hole is formed in the optical connection member, and the first ferrule, the optical connection member, and the second ferrule can be aligned by fitting the guide pin in the guide hole through the through hole.
    Type: Application
    Filed: October 2, 2019
    Publication date: February 17, 2022
    Applicant: FUJIKURA LTD.
    Inventors: Hirotaka Asada, Kansei Shindo, Kunihiko Fujiwara
  • Publication number: 20210173154
    Abstract: An optical connector includes: a ferrule including a guide pin hole, a plurality of fiber holes lined up in a width direction of the optical fiber, and an inclined end face; a housing in which the ferrule is retractably housed; and an application part that applies an upward force to the ferrule in an upward/downward direction when the optical connector connects with a counterpart connector in a connecting/disconnecting direction. The upward/downward direction is a height direction of the optical connector and is orthogonal to both the connecting/disconnecting direction and the width direction. The inclined end face projects upward toward the counterpart connector.
    Type: Application
    Filed: November 9, 2018
    Publication date: June 10, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Takahito Otomitsu, Shuhei Kanno, Shunsuke Fujita, Kunihiko Fujiwara
  • Publication number: 20210080656
    Abstract: An optical connector includes: a housing that retractably accommodates a ferrule; a spring that is accommodated in the housing to press the ferrule to a front side; and an engaging member connected to one end of the spring, fixed to the housing by engaging with the housing, and including a pair of arm parts arranged to sandwich the spring. When a direction perpendicular to a direction in which the spring presses the ferrule and to a direction in which the pair of arm parts is lined up is an up-down direction, window parts are arranged on both sides in the up-down direction of the housing. The engaging member includes: claw parts that are provided on an upper and a lower side of the pair of arm parts to engage with the window parts; and deformation parts that allow the claw parts to be displaced in the up-down direction.
    Type: Application
    Filed: October 16, 2018
    Publication date: March 18, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Shunsuke Fujita, Takahito Otomitsu, Shuhei Kanno, Kunihiko Fujiwara
  • Patent number: 10859767
    Abstract: An optical fiber cutter includes: a base member; a movable member that clamps the optical fiber extending from a fiber holder and that moves with respect to the base member between an advanced position and a retracted position in an extending direction of the optical fiber; a biasing member that biases the movable member at the retracted position forward; a locking member that regulates forward movement of the movable member at the retracted position; a cutter supporter that supports a blade that forms an initial cut in the optical fiber, that moves in a direction that intersects with the extending direction of the optical fiber, and that forms the initial cut at an initial cut forming position between the fiber holder and the movable member; and an unlocking member that releases the regulation of forward movement of the movable member before the blade reaches the initial cut forming position.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: December 8, 2020
    Assignee: Fujikura, Ltd.
    Inventors: Takaharu Matsuda, Kunihiko Fujiwara, Ryo Koyama, Mitsuru Kihara
  • Patent number: 10802226
    Abstract: A cleaning tool for cleaning a plurality of optical connectors where the cleaning tool includes: an adhesive portion that is integrally formed with the cleaning tool and that contacts a plurality of connecting end faces of the optical connectors collectively. The plurality of optical connectors are inserted into and connected with one housing that is fitted with another housing. The adhesive portion is disposed on the other housing. The adhesive portion contacts the connecting end faces collectively by fitting the one housing with the other housing.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: October 13, 2020
    Assignee: Fujikura Ltd.
    Inventors: Junichi Nakane, Kunihiko Fujiwara, Shigeo Takahashi, Akihiro Nakama, Hirotaka Asada
  • Patent number: 10782488
    Abstract: A connector-attached optical fiber cord includes: an optical fiber cord including a coated optical fiber and a sheath surrounding a circumference of the coated optical fiber; a ferrule attached to a front end of the coated optical fiber; a housing that houses the ferrule and the optical fiber cord such that the ferrule is exposed to an exterior of the housing at a front end of the housing while the optical fiber cord extends out of a rear end of the housing; a protective tube attached to a portion of the optical fiber cord in which the coated optical fiber is exposed; and a boot attached to the rear end of the housing and that allows the portion of the optical fiber cord to be inserted through the boot.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: September 22, 2020
    Assignee: Fujikura Ltd.
    Inventors: Thao Thi Thanh Nguyen, Kunihiko Fujiwara, Junya Watanabe
  • Publication number: 20200103592
    Abstract: A fiber cutter includes: a base including a fiber grip that grips an optical fiber; a slider including a fiber end grip that grips an end portion of the optical fiber, wherein the slider moves relative to the base; a cut former including a blade forming an initial cut in the optical fiber and disposed between the fiber grip and the fiber end grip; and a spring that applies a force between the base and the slider to apply a tension to the optical fiber gripped by the fiber grip and the fiber end grip, wherein the cut former is disposed on the slide, and when the initial cut grows and the optical fiber cleaves, the cut former moves together with the slider by the force of the spring.
    Type: Application
    Filed: May 7, 2018
    Publication date: April 2, 2020
    Applicants: Fujikura Ltd., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takaharu Matsuda, Kunihiko Fujiwara, Ryo Koyama, Mitsuru Kihara
  • Publication number: 20200016632
    Abstract: A cleaning tool that cleans an optical connector includes an adhesive body that contacts an optical signal region of the optical connector where an optical signal enters and is emitted from the optical connector. The adhesive body includes a protrusion that protrudes in a region—that contacts the optical signal region.
    Type: Application
    Filed: March 6, 2018
    Publication date: January 16, 2020
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Junichi Nakane, Kunihiko Fujiwara, Shigeo Takahashi, Hirotaka Asada, Makoto Goto, Masayoshi Suzuki
  • Publication number: 20190369337
    Abstract: A cleaning tool for cleaning a plurality of optical connectors where the cleaning tool includes: an adhesive portion that is integrally formed with the cleaning tool and that contacts a plurality of connecting end faces of the optical connectors collectively. The plurality of optical connectors are inserted into and connected with one housing that is fitted with another housing. The adhesive portion is disposed on the other housing. The adhesive portion contacts the connecting end faces collectively by fitting the one housing with the other housing.
    Type: Application
    Filed: October 23, 2017
    Publication date: December 5, 2019
    Applicant: FUJIKURA LTD.
    Inventors: Junichi Nakane, Kunihiko Fujiwara, Shigeo Takahashi, Akihiro Nakama, Hirotaka Asada
  • Publication number: 20190339453
    Abstract: An optical fiber cutter includes: a base member; a movable member that clamps the optical fiber extending from a fiber holder and that moves with respect to the base member between an advanced position and a retracted position in an extending direction of the optical fiber; a biasing member that biases the movable member at the retracted position forward; a locking member that regulates forward movement of the movable member at the retracted position; a cutter supporter that supports a blade that forms an initial cut in the optical fiber, that moves in a direction that intersects with the extending direction of the optical fiber, and that forms the initial cut at an initial cut forming position between the fiber holder and the movable member; and an unlocking member that releases the regulation of forward movement of the movable member before the blade reaches the initial cut forming position.
    Type: Application
    Filed: November 20, 2017
    Publication date: November 7, 2019
    Applicants: Fujikura Ltd., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takaharu Matsuda, Kunihiko Fujiwara, Ryo Koyama, Mitsuru Kihara