Patents by Inventor Akihiro Nakama

Akihiro Nakama 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: 20210208343
    Abstract: An optical-fiber-attached ferrule includes: an optical fiber hole into which an optical fiber is inserted and fixed with a first adhesive; and an adhesive-filling section including an opening surface and an opposed surface opposite the opening surface. The adhesive-filling section is filled with a second adhesive that is softer than the first adhesive with an end surface of the optical fiber positioned closer to the opposed surface than to the opening surface.
    Type: Application
    Filed: March 15, 2017
    Publication date: July 8, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Hirotaka Asada
  • Publication number: 20210132299
    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; and a base that holds the adhesive body. The base includes a first protrusion on a holding surface of a holding part that holds the adhesive body. The first protrusion is disposed at a rear side of a section of the adhesive body and is in contact with the optical signal region.
    Type: Application
    Filed: March 6, 2018
    Publication date: May 6, 2021
    Applicants: FUJIKURA LTD., TOMOEGAWA CO., LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Hirotaka Asada, Makoto Goto, Masayoshi Suzuki
  • Patent number: 10962725
    Abstract: A ferrule structure includes: a holding aperture that holds light guide members forming light guides; a recess that is recessed from a connection end surface with respect to a mating ferrule; a first lens array on a base surface that is a bottom surface of the recess; and a first groove that is recessed from the base surface and is on an outer side of the first lens array. The first lens array includes lenses that are aligned with the light guides.
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: March 30, 2021
    Assignee: Fujikura Ltd.
    Inventors: Akihiro Nakama, Hirotaka Asada
  • Publication number: 20200371298
    Abstract: A ferrule structure includes: a ferrule body including a body-side guide hole for insertion of a guide pin, and a holding hole that holds light guide members forming light guides; a lens plate including a plate-side guide hole for insertion of the guide pin, and a lens array that includes lenses aligned to the light guides; and a recessed part in an end part of at least one of the body-side guide hole and the plate-side guide hole on an adhesion surface side.
    Type: Application
    Filed: August 6, 2018
    Publication date: November 26, 2020
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Hirotaka Asada
  • Publication number: 20200341207
    Abstract: A ferrule structure includes: a holding aperture that holds light guide members forming light guides; a recess that is recessed from a connection end surface with respect to a mating ferrule; a first lens array on a base surface that is a bottom surface of the recess; and a first groove that is recessed from the base surface and is on an outer side of the first lens array. The first lens array includes lenses that are aligned with the light guides.
    Type: Application
    Filed: August 6, 2018
    Publication date: October 29, 2020
    Applicant: Fujikura Ltd.
    Inventors: Akihiro Nakama, Hirotaka Asada
  • 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: 10768380
    Abstract: A ferrule that holds an end part of an optical fiber includes a fiber hole into which the optical fiber is inserted and an upper wall part and a lower wall part that define a hollow adhesive filling part, where the lower wall part faces the upper wall part. The adhesive filling part is filled with an adhesive applied between the optical fiber inserted in the fiber hole and an inner wall surface of the adhesive filling part. The upper wall part has an upper opening through which the adhesive passes into the adhesive filling part, and the lower wall part has a lower opening that ventilates the adhesive filling part to outside of the ferrule.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: September 8, 2020
    Assignee: Fujikura Ltd.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Hirotaka Asada, Kazuaki Toba, Masanari Yamamoto, Ryohei Takahashi
  • Patent number: 10705299
    Abstract: A ferrule structure includes: a ferrule body including a guide hole that accepts insertion of a guide pin, and a fiber hole that accepts insertion of an optical fiber and that is disposed in an opening surface of the ferrule body; and a lens plate including a guide hole that accepts insertion of the guide pin, a lens part, and an abutment surface that abuts an endface of the optical fiber. A recess is disposed in at least one of the ferrule body and the lens plate. A matching material filling gap, that is to be filled with a refractive index matching material, is formed with the recess, between the opening surface of the ferrule body and the abutment surface of the lens plate.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: July 7, 2020
    Assignee: Fujikura Ltd.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Hirotaka Asada
  • Patent number: 10605997
    Abstract: An optical-fiber-attached ferrule of the invention includes: an optical fiber; and a ferrule that holds an end portion of the optical fiber, where the ferrule includes a ferrule end surface, a fiber hole to insert the optical fiber, an adhesive-filling section that includes an opening surface of the optical fiber hole and an opposed surface opposed to the opening surface, and a light transmitting part that transmits an optical signal between the ferrule end surface and the opposed surface, and an end surface of the optical fiber is disposed close to the opposed surface in the adhesive-filling section The adhesive-filling section is filled with an optical adhesive with Shore hardness D of equal to or less than 50.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: March 31, 2020
    Assignee: Fujikura Ltd.
    Inventors: Akihiro Nakama, Tatsuya Ota
  • Publication number: 20200088954
    Abstract: A ferrule that holds an end part of an optical fiber includes a fiber hole into which the optical fiber is inserted and an upper wall part and a lower wall part that define a hollow adhesive filling part, where the lower wall part faces the upper wall part. The adhesive filling part is filled with an adhesive applied between the optical fiber inserted in the fiber hole and an inner wall surface of the adhesive filling part. The upper wall part has an upper opening through which the adhesive passes into the adhesive filling part, and the lower wall part has a lower opening that ventilates the adhesive filling part to outside of the ferrule.
    Type: Application
    Filed: December 7, 2017
    Publication date: March 19, 2020
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Hirotaka Asada, Kazuaki Toba, Masanari Yamamoto, Ryohei Takahashi
  • 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: 20190353850
    Abstract: An optical loopback member attaches to a counterpart optical connector to face a plurality of optical fibers of the counterpart optical connector that includes a first input optical fiber, second input optical fiber, first output optical fiber, and second output optical fiber. The optical loopback member includes a first reflector including: a first output light reflection surface that reflects a first output light, outputted in a first direction, from the first output optical fiber; and a first input light reflection surface that reflects light reflected by the first output light reflection surface and directs the reflected light to the first input optical fiber arranged in a second direction with respect to the first output optical fiber. The second direction is perpendicular to the first direction.
    Type: Application
    Filed: February 28, 2018
    Publication date: November 21, 2019
    Applicant: FUJIKURA LTD.
    Inventors: Hirotaka Asada, Akihiro Nakama, Shigeo Takahashi
  • Publication number: 20190265417
    Abstract: A ferrule structure includes: a ferrule body including a guide hole that accepts insertion of a guide pin, and a fiber hole that accepts insertion of an optical fiber and that is disposed in an opening surface of the ferrule body; and a lens plate including a guide hole that accepts insertion of the guide pin, a lens part, and an abutment surface that abuts an endface of the optical fiber. A recess is disposed in at least one of the ferrule body and the lens plate. A matching material filling gap, that is to be filled with a refractive index matching material, is formed with the recess, between the opening surface of the ferrule body and the abutment surface of the lens plate.
    Type: Application
    Filed: November 29, 2017
    Publication date: August 29, 2019
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro NAKAMA, Shigeo TAKAHASHI, Hirotaka ASADA
  • Patent number: 10222559
    Abstract: A ferrule holds end portions of optical fibers and includes: a plurality of optical fiber holes arranged in a predetermined direction, wherein the optical fibers are inserted into the plurality of optical fiber holes; and an adhesive-filling section that is filled with an adhesive and internally includes an opening surface of the plurality of optical fiber holes and an opposed surface opposed to the opening surface. The adhesive-filling section includes an upper side opening and a lower side opening, the upper side opening opens on a top surface that is a surface on a side from which the adhesive is filled, and the lower side opening opens on a lower surface that is a surface on a side opposite to the top surface.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: March 5, 2019
    Assignee: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Tatsuya Ota
  • Patent number: 10209455
    Abstract: An optical-fiber-attached ferrule includes: an optical fiber hole into which an optical fiber is inserted; and a filling section filled with a liquid refractive index-matching material.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: February 19, 2019
    Assignee: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi
  • 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: 20180120516
    Abstract: A ferrule holds end portions of optical fibers and includes: a plurality of optical fiber holes arranged in a predetermined direction, wherein the optical fibers are inserted into the plurality of optical fiber holes; and an adhesive-filling section that is filled with an adhesive and internally includes an opening surface of the plurality of optical fiber holes and an opposed surface opposed to the opening surface. The adhesive-filling section includes an upper side opening and a lower side opening, the upper side opening opens on a top surface that is a surface on a side from which the adhesive is filled, and the lower side opening opens on a lower surface that is a surface on a side opposite to the top surface.
    Type: Application
    Filed: January 29, 2016
    Publication date: May 3, 2018
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Tatsuya Ota
  • Publication number: 20180120512
    Abstract: An optical-fiber-attached ferrule includes: an optical fiber hole into which an optical fiber is inserted; and a filling section filled with a liquid refractive index-matching material.
    Type: Application
    Filed: December 5, 2016
    Publication date: May 3, 2018
    Applicant: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi
  • Patent number: 9927583
    Abstract: An optical connector comprises a housing, a regulating portion which is protrudes toward an inner surface of the housing, a ferrule which is secured to an optical fiber and which is accommodated inside the housing so as to be movable. The ferrule includes a base portion and a thinned portion that has a thickness smaller than that of the base portion. If the ferrule moves forward in the butt-connection direction, the regulating portion and the base portion approach each other, so that the regulating portion regulates the movement of the ferrule in the thickness direction. If the ferrule moves backward in the butt-connection direction, the ferrule reaches a position where the thinned portion faces the regulating portion, so that the movement of the ferrule in the thickness direction is not regulated by the regulating portion.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: March 27, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Akihiro Nakama, Shigeo Takahashi, Kazuhiro Takizawa