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).

  • Patent number: 11111877
    Abstract: A piston in which a solid lubricant resin layer made of a resin containing a solid lubricant is formed at a skirt portion. A guide groove absent area where no guide groove is formed, which is provided in a predetermined range of the solid lubricant resin layer at a center portion in a width direction. The guide grooves directing from the both ends in the width direction of the guide groove absent area to both ends in the width direction of the skirt portion. The end portions of the guide grooves extended to end edges of the solid lubricant resin layer to form open ends. The solid lubricant resin layer and the guide grooves are formed at least at a thrust side skirt portion. The guide grooves are formed in a shape inclined upward from the guide groove absent area toward the end edges of the solid lubricant resin layer.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: September 7, 2021
    Assignee: ART METAL MFG. CO., LTD.
    Inventors: Chiaki Taresawa, Nobuyuki Fujiwara, Naoki Yamakawa, Kunihiko Kobayashi
  • 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
  • Publication number: 20190310430
    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: Application
    Filed: June 15, 2017
    Publication date: October 10, 2019
    Applicant: FUJIKURA LTD.
    Inventors: Thao Thi Thanh Nguyen, Kunihiko Fujiwara, Junya Watanabe
  • Patent number: 10345527
    Abstract: A holder includes a base including a reference surface and a slider to which an optical-fiber retainer that retains an optical-fiber can be attached. The slider is movable in a front-rear direction with respect to the base, and at least a portion of the optical-fiber retainer is accommodated between the reference surface and the slider when the optical-fiber retainer is attached to the slider and the optical-fiber retainer is positioned with respect to the reference surface by moving the slider toward a reference surface side.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: July 9, 2019
    Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takashi Yamaguchi, Kunihiko Fujiwara, Yuji Aoyagi, Katsushi Nakayachi, Keisuke Yoneda
  • Patent number: 10247885
    Abstract: An optical connector includes a holding member that has a main body section including a bottom wall section and a pair of side wall sections. The holding member is capable of holding, in a space surrounded by the bottom wall section and the pair of side wall sections, an optical cable including a layer of a fibrous tensile member and an optical connector main body including a fixing section that fixes the holding member. The holding member also includes a pinching member that is configured to pinch the fibrous tensile member between itself and an outer surface of the bottom wall section of the main body section. The fixing section includes a pair of inner surfaces that pinches the main body section and the pinching member from a direction in which the pinching member and the bottom wall section pinch the fibrous tensile member.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: April 2, 2019
    Assignee: FUJIKURA LTD.
    Inventors: Takashi Yamaguchi, Kunihiko Fujiwara
  • Publication number: 20190077123
    Abstract: A translucent material according to this invention includes a base made of a glass-based material, and an oxide layer layered in an upper direction (or on an upper surface) of the base. Examples of the base may include tempered glass using soda lime glass or aluminosilicate glass, heat-resistant glass mostly using borosilicate glass, and quartz glass. The oxide layer includes yttrium oxide (Y2O3) as a base material thereof and further includes nitrogen and a Group 4A element. The translucent material having such a composition is qualified to constitute a low-adhesion material and a molding member. When quartz glass is selected and used as the base material, an intermediate layer may be interposed between the base and the oxide layer.
    Type: Application
    Filed: March 13, 2017
    Publication date: March 14, 2019
    Inventors: Kunihiko FUJIWARA, Daisuke HIGASHI, Tomoko KISHIMOTO
  • Publication number: 20190025522
    Abstract: An optical connector includes a holding member that has a main body section including a bottom wall section and a pair of side wall sections. The holding member is capable of holding, in a space surrounded by the bottom wall section and the pair of side wall sections, an optical cable including a layer of a fibrous tensile member and an optical connector main body including a fixing section that fixes the holding member. The holding member also includes a pinching member that is configured to pinch the fibrous tensile member between itself and an outer surface of the bottom wall section of the main body section. The fixing section includes a pair of inner surfaces that pinches the main body section and the pinching member from a direction in which the pinching member and the bottom wall section pinch the fibrous tensile member.
    Type: Application
    Filed: January 12, 2017
    Publication date: January 24, 2019
    Applicant: FUJIKURA LTD.
    Inventors: Takashi Yamaguchi, Kunihiko Fujiwara
  • Publication number: 20180348441
    Abstract: A holder includes a base including a reference surface and a slider to which an optical-fiber retainer that retains an optical-fiber can be attached. The slider is movable in a front-rear direction with respect to the base, and at least a portion of the optical-fiber retainer is accommodated between the reference surface and the slider when the optical-fiber retainer is attached to the slider and the optical-fiber retainer is positioned with respect to the reference surface by moving the slider toward a reference surface side.
    Type: Application
    Filed: January 19, 2017
    Publication date: December 6, 2018
    Applicants: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takashi Yamaguchi, Kunihiko Fujiwara, Yuji Aoyagi, Katsushi Nakayachi, Keisuke Yoneda
  • Patent number: 10101541
    Abstract: An optical ferrule and an optical connector are provided, which make it possible to reduce the labor required for an adhesive wiping operation even when the optical ferrule is small-sized. A first adhesive filling recess 113 is equipped, which is formed at an outlet of an optical fiber hole 112 so that a forward end of a bare fiber 120, which is positioned by the optical fiber hole 112, is allowed to abut against an inner wall 113w opposed to the outlet, and the bare fiber 120 is adhered and fixed in a resultant state by means of an adhesive 131 with which the recess is filled, wherein the first adhesive filling recess 113 is provided with adhesive accommodating recesses 115, 117 which are shallower than the first adhesive filling recess 113 and are disposed continuously with the first adhesive filling recess 113.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: October 16, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Tatsuya Ohta, Kunihiko Fujiwara, Takanobu Mikami
  • Publication number: 20170351039
    Abstract: A cleaning tool includes a head member that presses a cleaning element at a pressing face against a cleaning target; a feed mechanism that supplies the cleaning element to the pressing face and that collects the cleaning element from the pressing face; and a liquid supply section that supplies a liquid cleaner and moistens the cleaning element at the pressing face with the liquid cleaner.
    Type: Application
    Filed: June 7, 2017
    Publication date: December 7, 2017
    Applicant: FUJIKURA LTD.
    Inventors: Junichi Nakane, Kunihiko Fujiwara
  • Patent number: 9429717
    Abstract: A ferrule of the present invention includes a positioning mechanism for positioning an optical fiber, and a recess having at least a first inner wall for allowing a front end of the optical fiber portion positioned by the positioning mechanism to protrude, and a second inner wall opposite to the first inner wall. A distance between the first inner wall and the second inner wall is less than or equal to four times the outer diameter of the optical fiber. Adhesive is filled into the recess and cured in a state in which the optical fiber protrudes from the first inner wall and substantially contacts the second inner wall to fix the optical fiber.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: August 30, 2016
    Assignee: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Tatsuya Ohta, Akito Nishimura, Terutake Kobayashi, Kunihiko Fujiwara
  • Patent number: 9134485
    Abstract: An optical connector cleaning tool includes a cleaning body that is fed and moved, a feeding mechanism that performs supply and take-up of the cleaning body, a housing body that houses the feeding mechanism, an extension portion that extends from the housing body, comprising a plurality of distal end tube portions, and an outer tube body through which the plurality of distal end tube portions pass, including a plurality of distal end openings from which the plurality of distal end tube portions are extended; and a head member that is passed through each of the plurality of distal end tube portions and that presses the cleaning body against the joining end face at the distal end of the extension portion.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: September 15, 2015
    Assignee: FUJIKURA LTD.
    Inventors: Kunihiko Fujiwara, Junichi Nakane