Patents Assigned to Fujikura Ltd.
  • Patent number: 11050130
    Abstract: Provided is a dielectric waveguide having a good reflection characteristic also in a band on a low frequency side of a center frequency of a given operation band. A dielectric waveguide (1) includes: a waveguide region (12) which is defined by a first wide wall (21), a second wide wall (22), a first narrow wall (23), a second narrow wall (24), and a short wall (25) and which is filled with a dielectric; and a mode conversion section (31) which includes a columnar conductor (34) extending from a surface of the waveguide region (12) toward an inside of the waveguide region (12). A width (W2) of the short wall (25) is configured to be greater than a waveguide width (Wi) at a location (x=x1) at which the columnar conductor (34) is provided.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: June 29, 2021
    Assignee: FUJIKURA LTD.
    Inventor: Yusuke Uemichi
  • Patent number: 11048054
    Abstract: An optical fiber cable includes: a core; an outer filling disposed outside the core; and a sheath that covers the core and the outer filling. The core includes: optical fibers; an inner filling; and a wrapping tube that wraps the optical fibers and the inner filling. The outer filling and the inner filling absorb water.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: June 29, 2021
    Assignee: Fujikura Ltd.
    Inventors: Shogo Shimizu, Akira Namazue, Go Taki, Ken Osato
  • Patent number: 11048039
    Abstract: An optical fiber includes: a core; a depressed layer surrounding the core; and a cladding surrounding the depressed layer. A refractive index profile of the core is an ?-th power distribution having an index ? of 1.0 or more and 2.9 or less. A relative refractive index difference ?? of the depressed layer with respect to the cladding has an absolute value |??| that is 0.05% or more and 0.15% or less. A ratio r1/r2 of a radius r1 of the core to an outer radius r2 of the depressed layer is 0.35 or more and 0.60 or less. A cable cutoff wavelength ?cc of 22 m is less than 1.26 ?m. A mode field diameter at a wavelength of 1.31 inn is larger than 8.6 inn and smaller than 9.5 ?m.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: June 29, 2021
    Assignee: Fujikura Ltd.
    Inventor: Ryo Maruyama
  • Patent number: 11048043
    Abstract: An optical fiber fusion-splicer that fusion-splices at least a pair of optical fibers that includes: a pair of electrode rod units each having a pointed end portion that faces each other and a pair of mounting bases that each support the electrode rod units. Abutting portions of the optical fibers are interposed between the pair of electrode rod units. Each of the electrode rod units includes: an electrode rod that fusion-splices the optical fibers by discharge heating and a main heat dissipation member that protrudes from an outer circumferential surface of the electrode rod. Each of the pair of mounting bases supports a position of the electrode rod units that is closer to a base end side than a pointed end portion of the electrode rod.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: June 29, 2021
    Assignee: Fujikura Ltd.
    Inventors: Noriyuki Kawanishi, Makoto Iwamatsu
  • Publication number: 20210191061
    Abstract: A method for manufacturing an optical fiber ribbon includes: forming a colored layer on to each of a plurality of optical fibers and forming an optical fiber ribbon by curing a connecting material applied to a surface of the colored layer of each of the optical fibers to form connection parts that connect adjacent ones of the optical fibers. Forming the colored layer further includes: applying a coloring agent to the optical fibers and curing the coloring agent such that uncured resin remains on the surface of the colored layer. Forming the optical fiber ribbon further includes: applying the connecting material to the surface with the uncured resin and curing the connecting material and the uncured resin on the surface of the colored layer.
    Type: Application
    Filed: November 8, 2016
    Publication date: June 24, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Mizuki Isaji, Soichiro Kaneko, Ken Osato
  • Publication number: 20210194105
    Abstract: Provided is a dielectric waveguide having a good reflection characteristic also in a band on a low frequency side of a center frequency of a given operation band. A dielectric waveguide (1) includes: a waveguide region (12) which is defined by a first wide wall (21), a second wide wall (22), a first narrow wall (23), a second narrow wall (24), and a short wall (25) and which is filled with a dielectric; and a mode conversion section (31) which includes a columnar conductor (34) extending from a surface of the waveguide region (12) toward an inside of the waveguide region (12). A width (W2) of the short wall (25) is configured to be greater than a waveguide width (W1) at a location (x=x1) at which the columnar conductor (34) is provided.
    Type: Application
    Filed: October 26, 2018
    Publication date: June 24, 2021
    Applicant: FUJIKURA LTD.
    Inventor: Yusuke Uemichi
  • Publication number: 20210195741
    Abstract: A component-embedded substrate includes: insulating layers each including a wiring pattern; an embedded component including a connection terminal; a plurality of vias that electrically connect the connection terminal to the wiring patterns adjacent to each other in a lamination direction. Each of the vias is composed of a via hole in the insulating layer and a conductive material in the via hole. One of the vias is a connection via connected to the connection terminal, and another of the vias is an adjacent via adjacent to the connection via in the lamination direction. The connection via and adjacent via overlap in a plan view. S1/A1?0.61 and S1/A2?0.61 are satisfied, where A1 is an average cross-sectional area of the connection via, A2 is an average cross-sectional area of the adjacent via, and S1 is an overlapping area of the connection via and adjacent via in the plan view.
    Type: Application
    Filed: June 12, 2019
    Publication date: June 24, 2021
    Applicant: Fujikura Ltd.
    Inventors: Masakazu Sato, Nobuki Ueta, Yoshio Nakao, Masatoshi Inaba
  • Publication number: 20210180168
    Abstract: A method of manufacturing an aluminum alloy wire includes: forming a rough drawing wire composed of an aluminum alloy containing aluminum, an additive element, and unavoidable impurities, the additive element including Si and Mg; obtaining an aluminum alloy wire by performing a treatment on the rough drawing wire, wherein the treatment includes at least one or more wire drawing treatments; forming a first solution treatment material by forming a solid solution of the aluminum and the additive element and then performing a quenching treatment on the solid solution, wherein the first solution treatment is performed directly before the last of the one or more wire drawing treatments is performed; a second solution treatment that forms a second solution treatment material by forming a solid solution of the aluminum and the additive element and then performing a quenching treatment on the solid solution.
    Type: Application
    Filed: September 6, 2018
    Publication date: June 17, 2021
    Applicant: Fujikura Ltd.
    Inventors: Tatsunori Shinoda, Naoki Kaneko, Tsuyoshi Yoshioka
  • Publication number: 20210181015
    Abstract: A photodetection device including: first optical fibers; a second optical fiber; an optical combiner having: an end face connected to an end face of each of the first optical fibers; and another end face connected to an end face of the second optical fiber; a first photodetector that detects an intensity of light propagating through at least one of the first optical fibers; a second photodetector that detects Rayleigh scattering of light propagating through the second optical fiber; and a calculator that calculates the intensity of light propagating in a predetermined direction through the first optical fibers or the second optical fiber, from a result of detection by the first photodetector and a result of detection by the second photodetector.
    Type: Application
    Filed: June 21, 2019
    Publication date: June 17, 2021
    Applicant: Fujikura Ltd.
    Inventors: Shinichi Sakamoto, Wataru Kiyoyama
  • 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: 20210175676
    Abstract: A laser apparatus includes: an optical fiber through which a laser beam propagates; a resin that fixes the optical fiber; a sound sensor that detects a sound produced by the resin that shrinks when a power of light propagating through the optical fiber decreases from its peak value; a storage that stores a threshold relating to a sound produced when the resin shrinks; and a comparison determination part. The comparison determination part compares a detected value representative of the sound detected by the sound sensor to the threshold stored in the storage and determines that the resin has been degraded when the detected value exceeds the threshold.
    Type: Application
    Filed: September 24, 2019
    Publication date: June 10, 2021
    Applicant: FUJIKURA LTD.
    Inventor: Naoyuki Sugiyama
  • Publication number: 20210171394
    Abstract: A method of producing an optical fiber wire including a coating made of an ultraviolet curable resin, the method includes: a first irradiation step including applying first ultraviolet light to a point on the optical fiber wire where at least a portion of the ultraviolet curable resin is uncured; and a second irradiation step including applying second ultraviolet light to the point on the optical fiber wire where at least the portion is cured after the first irradiation step. The portion is a surface layer of the coating. A temperature of the optical fiber wire immediately before the second irradiation step is 50° C. or higher and 300° C. or lower.
    Type: Application
    Filed: November 7, 2018
    Publication date: June 10, 2021
    Applicant: FUJIKURA LTD.
    Inventors: Kenji Yamashiro, Hiroo Kawahara
  • Publication number: 20210170914
    Abstract: A plurality of pressure-sensitive switches of a sitting sensor (1) has a first pressure-sensitive switch group including a first pressure-sensitive switch (SW11) including a first specific pressure-sensitive switch and a second pressure-sensitive switch (SW21), and a second pressure-sensitive switch group including first pressure-sensitive switches (SW11, SW12) including the first specific pressure-sensitive switch, and a second pressure-sensitive switch (SW22), in which in the first pressure-sensitive switch group, the first pressure-sensitive switch (SW11) and the second pressure-sensitive switch (SW21) are disposed adjacent to each other along a left-right direction of a seat (SE), in the second pressure-sensitive switch group, the first pressure-sensitive switches (SW11, SW12) and the second pressure-sensitive switch (SW22) are disposed adjacent to each other along a front-rear direction of the seat (SE), and turning on the first pressure-sensitive switch and the second pressure-sensitive switch causes a
    Type: Application
    Filed: April 10, 2019
    Publication date: June 10, 2021
    Applicant: Fujikura Ltd.
    Inventors: Tetsuya KAWAHIRA, Eriko HAYASHI
  • Patent number: 11028257
    Abstract: A flame-retardant resin composition may include a base resin composed of polyethylene and an acid-modified polyolefin, a silicone compound, a fatty acid-containing compound, and a hindered amine-based compound that includes a hindered amine structure. The polyethylene may include a high-density polyethylene, a medium-density polyethylene and a low-density polyethylene, where the high-density polyethylene has a density of 945 kg/m3 or more, the medium-density polyethylene has a density of 914 kg/m3 or more and less than 945 kg/m3, and the low-density polyethylene has a density of 864 kg/m3 or more and less than 914 kg/m3. The base resin may contain the high-density polyethylene in an amount of 40 mass % or more and 60 mass % or less, the medium-density polyethylene in an amount of 1 mass % or more and 35 mass % or less, and the low-density polyethylene in an amount of 10 mass % or more and 30 mass % or less.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: June 8, 2021
    Assignee: Fujikura Ltd.
    Inventors: Yusuke Yamaki, Shoichiro Nakamura
  • Publication number: 20210163337
    Abstract: A method for producing a porous glass fine particle body includes: a first layer formation step of continuously forming in a longitudinal direction of a rotating starting base material without a break, a first soot layer on a surface of the rotating starting base material; and an second layer formation step of forming second soot layers on an outside of the first soot layer while supplying a raw material gas to each of a burner among burners of a burner group and moving the burner group in a reciprocating manner in the longitudinal direction relative to the rotating starting base material. The burner group and the starting base material move relatively to each other along the longitudinal direction.
    Type: Application
    Filed: April 12, 2019
    Publication date: June 3, 2021
    Applicant: Fujikura Ltd.
    Inventor: Nobutoshi Sato
  • Publication number: 20210161019
    Abstract: A method for manufacturing a multilayer printed wiring board includes: preparing a first wiring board that includes a circuit region formed with one or more signal lines on a main surface of a first insulating substrate; preparing a second wiring board that includes an electrically conductive layer on a main surface of a second insulating substrate; disposing a spacer at a position spaced apart from an outer edge of the circuit region by a predetermined distance along at least a part of the outer edge; disposing an adhesive layer on the circuit region so that a space is provided between the adhesive layer and the spacer; and laminating the first wiring board and the second wiring board for thermocompression bonding.
    Type: Application
    Filed: July 30, 2018
    Publication date: May 27, 2021
    Applicant: Fujikura Ltd.
    Inventor: Akimi Yamazaki
  • Patent number: 11018718
    Abstract: A wireless communication device includes a storage that stores a standard beam table, which is a table constituted by a plurality of antenna weight vector sets corresponding to beam patterns in which beam angular intervals are uniform, and a controller that determines a direction, in which a communication partner's wireless communication device exists, as a direction to be optimized, generates an optimized beam table by changing the angular intervals between the beams of the standard beam table with respect to the direction to be optimized so as to be dense, and performs a communication with the communication partner's wireless communication device using the optimized beam table.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: May 25, 2021
    Assignee: FUJIKURA LTD.
    Inventor: Ken Sakuma
  • Patent number: 11018441
    Abstract: A high gain of an antenna is achieved while suppressing interference of a radio wave from an RFIC. A plurality of serial-type radiation element rows 41 are arranged in parallel. A parallel feed line 45 branches from a feed terminal of an electronic component 11, and connects radiation elements 42, at ends of the serial-type radiation element row 41 farthest from the electronic component 11, to the feed terminal of the electronic component 11. All of the serial-type radiation element rows have an identical path length, along the parallel feed line 45, from each of the radiation elements 42 at the ends farthest from the electronic component 11 to the feed terminal of the electronic component 11. An amplifier 61 is connected to the parallel feed line on a halfway portion of the parallel feed line 45. The amplifier 61 amplifies a signal passing through the parallel feed line 45.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: May 25, 2021
    Assignee: FUJIKURA LTD.
    Inventor: Hideyuki Wada
  • Publication number: 20210151266
    Abstract: A switch includes: a first electrode sheet including a first electrode; a second electrode sheet including a second electrode that faces the first electrode sheet; and an adhesive that includes a first opening through which the first electrode faces the second electrode sheet and that attaches the first electrode sheet to the second electrode sheet. The first electrode sheet includes: a first substrate on which the first electrode is disposed; a first spacer between the first substrate and the second electrode sheet that includes a second opening at a position corresponding to the first electrode; and a first base between the first substrate and the first spacer that overlaps at least a portion of an edge of the first opening of the adhesive. The first spacer is attached to the second electrode sheet by the adhesive.
    Type: Application
    Filed: June 18, 2018
    Publication date: May 20, 2021
    Applicant: Fujikura Ltd.
    Inventors: Yasuyuki Matsushima, Wataru Tanaka, Yasuyuki Tachikawa
  • Publication number: 20210146405
    Abstract: An optical connector cleaning tool includes: a tool body; and an extension that moves relatively with respect to the tool body. The extension extends out of the tool body and includes a head that presses a cleaning element formed with a tape-like adhesive element onto an optical connector. A relative movement of the extension with respect to the tool body carries the cleaning element to the head, and after carrying the cleaning element to the head, enables the cleaning element to contact the optical connector.
    Type: Application
    Filed: December 14, 2018
    Publication date: May 20, 2021
    Applicant: Fujikura Ltd.
    Inventor: Junichi Nakane