Patents Assigned to Fujikura Ltd.
  • Publication number: 20240061191
    Abstract: A manufacturing tool for an optical connector includes: a tool body that includes a concave part; a handle that includes an operating part and a contact part; and a connecting shaft that rotatably connects the handle to the tool body. The handle is rotatable between: a stand-by position, and a push-into position in which a larger portion of the contact part is disposed inside the concave part than in the stand-by position. A direction in which the operating part moves is different from a direction in which the contact part moves.
    Type: Application
    Filed: October 18, 2021
    Publication date: February 22, 2024
    Applicant: Fujikura Ltd.
    Inventor: Masayuki Hirose
  • Publication number: 20240061185
    Abstract: An optical connector includes: a ferrule holding an optical fiber; a holder holding the ferrule; a protection sleeve including a tip that is fixed to a sleeve fixing portion of the holder; an inner housing in which at least a part of the sleeve fixing portion is housed; and an outer housing in which at least a part of the inner housing is housed. The inner housing includes a tab portion that tilts in a radial direction of the ferrule and applies a pressure on the protection sleeve by tilting inward in the radial direction in a state in which the tab portion is disposed inside the outer housing.
    Type: Application
    Filed: November 24, 2021
    Publication date: February 22, 2024
    Applicant: Fujikura Ltd.
    Inventor: Ririka Seino
  • Publication number: 20240053559
    Abstract: An optical cable includes an optical fiber, an outer sheath that houses the optical fiber, and a tubular reinforcement sheet disposed between the optical fiber and the outer sheath. In a cross section perpendicular to a length direction of the optical cable, an adhesive strength between the tubular reinforcement sheet and the outer sheath in a first zone is stronger than an adhesive strength between the tubular reinforcement sheet and the outer sheath in a second zone.
    Type: Application
    Filed: April 27, 2022
    Publication date: February 15, 2024
    Applicant: Fujikura Ltd.
    Inventors: Shinnosuke Sato, Daisuke Hikima, Daiki Takeda, Ken Osato
  • Publication number: 20240053562
    Abstract: An optical fiber cable includes: a core including optical fibers; a reinforcing wrap that surrounds the core; and a sheath that accommodates the core and the reinforcing wrap. The reinforcing wrap includes an overlapping portion. A first end portion of the reinforcing wrap overlaps a second end portion of the reinforcing wrap at a portion of the reinforcing wrap in a circumferential direction of the optical fiber cable in a cross-sectional view.
    Type: Application
    Filed: October 27, 2023
    Publication date: February 15, 2024
    Applicant: Fujikura Ltd.
    Inventors: Tomoaki Kaji, Akira Namazue, Ken Osato
  • Publication number: 20240051226
    Abstract: A stereolithography device includes: a container that stores a photocurable resin before curing, the container having a bottom plate that is optically transparent; a holder configured to be immersed into the photocurable resin; a reaction light irradiation section configured to irradiate a reaction light that accelerates curing of the photocurable resin, wherein the reaction light passes through a boundary surface between the bottom plate and the photocurable resin; and an inhibition light irradiation section configured to irradiate an inhibition light that inhibits curing of the photocurable resin, wherein the inhibition light is totally reflected at the boundary surface.
    Type: Application
    Filed: August 18, 2021
    Publication date: February 15, 2024
    Applicant: Fujikura Ltd.
    Inventor: Hiroyuki Yamagishi
  • Publication number: 20240051865
    Abstract: An optical fiber preform includes: a cladding glass body that is a cladding of an optical fiber, is cylindrical, and comprises an inner hole along an axial direction; a glass rod accommodated in the inner hole; and a dummy silica rod selected from either one of a first solid dummy silica rod fixed to a first end of the cladding glass body that closes a first end of the inner hole positioned at the first end of the cladding glass body, or a second solid dummy silica rod accommodated and integrated in a connecting glass tube fixed to the first end to close a first tip opening end of the connecting glass tube. A tip seal that closes a second end of the inner hole at a second end of the cladding glass body is provided in the second end of the cladding glass body.
    Type: Application
    Filed: October 23, 2023
    Publication date: February 15, 2024
    Applicant: Fujikura Ltd.
    Inventors: Yoshimichi Amma, Katsuhiro Takenaga, Ryohei Fukumoto
  • Patent number: 11901317
    Abstract: The present invention reduces an electromagnetic coupling that can occur between a first signal line provided on a first substrate and a second signal line provided on a main surface of a second substrate on the first substrate side. A wireless module (10) includes an RFIC (28), a baseband IC (16), a first substrate (11) on which first signal lines (121 through 126) for transmitting a baseband signal are provided, and a second substrate (21) provided with second signal lines (2201 through 2232) for transmitting an RF signal on a main surface (211). The first substrate (11) is provided with a pseudo conductor wall (post wall 13) for shielding the first signal lines (121 through 126) and the second signal lines (2201 through 2232).
    Type: Grant
    Filed: December 17, 2020
    Date of Patent: February 13, 2024
    Assignee: FUJIKURA LTD.
    Inventor: Kohei Matsumaru
  • Patent number: 11899266
    Abstract: [Problem] When a surface of the optical fiber ribbon is rough, the microbending loss is increased due to the irregularities formed on the surface of the optical fiber ribbon. [Solution] An intermittently connected optical fiber ribbon of the present disclosure, includes: a plurality of optical fibers arranged in a predetermined direction; and connecting portions that intermittently connect two adjacent ones of the optical fibers. A peripheral cover portion formed of resin configuring the connecting portions is formed on a periphery of the optical fibers. An arithmetic mean roughness Ra of a surface of the peripheral cover portion is 0.41 ?m or lower.
    Type: Grant
    Filed: May 12, 2020
    Date of Patent: February 13, 2024
    Assignee: Fujikura Ltd.
    Inventors: Yoshie Murakoshi, Akira Namazue, Ken Osato
  • Patent number: 11901690
    Abstract: A fiber laser device includes a pumping light source, an amplifying fiber, an input side fiber fusion-spliced on an input side of the amplifying fiber and formed with a HR-FBG, an output side fiber fusion-spliced on an output side of the amplifying fiber and formed with an OC-FBG having a reflectivity smaller than that of the HR-FBG, an output end, and a mode filter, wherein the input side fiber or an intermediate fiber disposed between the amplifying fiber and the input side fiber is fusion-spliced with the amplifying fiber via a fusion splice portion, and at least a portion of the mode filter is disposed in a region between the fusion splice portion and a position separated from the fusion splice portion by a coherence length of beating caused by mode interference of signal light propagating in the amplifying fiber.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: February 13, 2024
    Assignee: Fujikura Ltd.
    Inventors: Yasuo Nakanishi, Yasuhiro Mashiko, Shinichi Sakamoto, Kensuke Shima
  • Patent number: 11899259
    Abstract: A cable that protects an object includes: a sheath; and a cylindrical reinforcement member disposed inside the sheath and that surrounds the object. The cylindrical reinforcement member has a first side edge and a second side edge that extend in a longitudinal direction. The cylindrical reinforcement member is formed of a cable reinforcement sheet including: a first metal sheet; and a second metal sheet joined to the first metal sheet. A portion of the first metal sheet overlaps a portion of the second metal sheet, and the overlapping portions define a joint portion where the first metal sheet and the second metal sheet are joined. The joint portion is inclined, from the second side edge to the first side edge, toward the first metal sheet.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: February 13, 2024
    Assignee: Fujikura Ltd.
    Inventors: Akira Namazue, Tomoaki Kaji, Ken Osato
  • Patent number: 11892679
    Abstract: A fusion splicer includes: a device main body including a heater that heats a pair of optical fibers that each include a glass part and a coated part; a pair of glass holders each including a groove on which the respective glass part is disposed; a pair of first clamps that each clamp the respective glass part against the respective glass holder; a pair of second clamps that each clamp the respective coated part from above; a third clamp that is fixed to the device main body and that restricts movement of at least one of the optical fibers in a closed state; and a windproof cover that covers the heater, the glass holders, the first clamps, the second clamps, and the third clamp.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: February 6, 2024
    Assignee: Fujikura Ltd.
    Inventor: Ryo Hasegawa
  • Patent number: 11892694
    Abstract: Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in V-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2, and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.
    Type: Grant
    Filed: June 15, 2022
    Date of Patent: February 6, 2024
    Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Akira Namazue, Ken Osato, Naoki Okada, Yusuke Yamada, Daisuke Kakuta, Hisaaki Nakane, Shinya Hamaguchi
  • Publication number: 20240038264
    Abstract: An optical memory includes a support and nanoparticles, each of which changes between a crystal phase and an amorphous phase when irradiated with light. The nanoparticles are supported by the support and spaced apart from each other in one or both of an in-plane direction of a face of the support and a direction normal to the face of the support.
    Type: Application
    Filed: August 20, 2021
    Publication date: February 1, 2024
    Applicants: FUJIKURA LTD., FUJIKURA LTD.
    Inventor: Yuichiro Kunai
  • Publication number: 20240035924
    Abstract: An inspection method, for an optical fiber including a bare optical fiber and a light-transmitting coating layer that coats an outer peripheral surface of the bare optical fiber, includes: irradiating, with illumination light having directivity, an outer peripheral surface of a wound body that includes the optical fiber wound in multiple layers around a bobbin; receiving the illumination light reflected by the wound body and generating image data containing at least a part of an image of the illumination light; and determining, based on the image data, whether a stripe pattern is projected in the image. The stripe pattern is a state in which the illumination light repeatedly changes along a winding direction of the optical fiber.
    Type: Application
    Filed: July 13, 2021
    Publication date: February 1, 2024
    Applicant: Fujikura Ltd.
    Inventor: Satoshi Matsunaga
  • Patent number: 11888203
    Abstract: A filter device having desired characteristics is easily designed. The filter device includes a post-wall waveguide functioning as a resonator group including five congruent resonators (R1 to R5). The resonators (R1, R2) include therein respective control posts (CP1, CP2), and a shortest distance (di) from the control post (CPi) to a narrow wall of the resonator (Ri) satisfies d1>d2. The resonators (R4, R5) include therein respective control posts (CP4, CP5), and a shortest distance (dj) from the control post (CPj) to a narrow wall of the resonator (Rj) satisfies d4<d5.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: January 30, 2024
    Assignee: FUJIKURA LTD.
    Inventor: Yusuke Uemichi
  • Publication number: 20240030574
    Abstract: The power splitter-combiner (1) includes one combining terminal (11), two split terminals (12a, 12b), an absorption resistance (13) connected between the two split terminals, a first transmission line (14a) connected between the combining terminal and one split terminal of the two split terminals, a second transmission line (14b) connected between the combining terminal and the other split terminal of the two split terminals and having a length shorter than that of the first transmission line, and at least one first open stub (15) connected to the second transmission line.
    Type: Application
    Filed: May 31, 2021
    Publication date: January 25, 2024
    Applicant: Fujikura Ltd.
    Inventor: Yusuke Uemichi
  • Patent number: 11881887
    Abstract: A frequency converter up-converts a transmission signal in an intermediate frequency hand into a signal in a wireless frequency hand as a USB or an LSR of a local oscillation signal using the local oscillation signal. When PMhigh?1/2×IFwid?RFtx?PMhigh?1/2×CHwid, the frequency converter is configured to satisfy ?LO=PMhigh?1/2×Fwid?IFcent and IFtx=RFtx??LO. Alternatively, when PMlow+1/2×IFwid?RFtx?PMlow+1/2×CHwid, the frequency converter is configured to satisfy ?LO=PMlow+1/2×IFwid+IFcent and IFtx=?LO?RFtx.
    Type: Grant
    Filed: January 13, 2021
    Date of Patent: January 23, 2024
    Assignee: FUJIKURA LTD.
    Inventors: Yo Yamaguchi, Kiyoshi Kobayashi
  • Publication number: 20240019644
    Abstract: An end part structure for an optical connector includes a ferrule having a connection end face and a fiber hole into which an optical fiber is inserted up to the connection end face, a spring disposed at a rear side of the ferrule in a longitudinal direction of the fiber hole, a spring push that surrounds the optical fiber, a housing that accommodates the ferrule and the spring and to which the spring push is locked such that the ferrule is biased forward by the spring, a braided tube mounted on the spring push, and a fixing member that fixes the braided tube to the spring push. The spring is sandwiched between the spring push and the ferrule in the longitudinal direction.
    Type: Application
    Filed: June 23, 2021
    Publication date: January 18, 2024
    Applicant: Fujikura Ltd.
    Inventor: Shuhei Kanno
  • Publication number: 20240019615
    Abstract: An optical computing device includes a substrate and planar light diffraction elements. Each of the planar light diffraction elements is fixed to the substrate and includes microcells that have respective thicknesses or refractive indices set independently.
    Type: Application
    Filed: August 2, 2021
    Publication date: January 18, 2024
    Applicant: FUJIKURA LTD.
    Inventor: Hiroyuki Yamagishi
  • Publication number: 20240019643
    Abstract: A boot configured to be attached to a ferrule includes: a fiber insertion hole into which optical fibers are inserted; a lower part on one side with respect to the fiber insertion hole; and an upper part on another side with respect to the fiber insertion hole. The fiber insertion hole is disposed to correspond with fiber holes of the ferrule that are disposed in an array in one direction. The upper part includes a protrusion part that protrudes relative to an end surface of the lower part in a fiber insertion direction. The ferrule includes: an adhesive filling part configured to be filled with an adhesive; and a stepped part that guides the optical fibers into the fiber holes.
    Type: Application
    Filed: August 25, 2021
    Publication date: January 18, 2024
    Applicant: FUJIKURA LTD.
    Inventor: Hirotaka Asada