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公开(公告)号：US20240288647A1
公开(公告)日：2024-08-29
申请号：US18570957
申请日：2021-06-18
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Akira SAKURAI , Hiroaki TANIOKA , Shigekatsu TETSUTANI , Yusuke YAMADA , Masashi KIKUCHI
IPC: G02B6/44
CPC classification number: G02B6/4431
Abstract: In order to achieve the above-mentioned object, an optical fiber cable according to the present disclosure includes an optical fiber core wire, a sheath covering the optical fiber core wire, three or more anti-tension members inside the sheath, arranged along a longitudinal axis of the optical fiber core wire, and a tear string having an outer periphery a part of which is located outside an outer circumscribed lines of outer peripheries of the three or more anti-tension members in certain cross-sections perpendicular to a longitudinal direction of the sheath, and a part of which comes in contact with an inner periphery of the sheath or is located inside the inner periphery of the sheath in a cross-section perpendicular to the longitudinal direction of the sheath.
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公开(公告)号：US20240272394A1
公开(公告)日：2024-08-15
申请号：US18289763
申请日：2021-05-31
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Masashi KIKUCHI , Shigekatsu TETSUTANI , Yusuke YAMADA , Akira SAKURAI , Hiroaki TANIOKA
IPC: G02B6/44
CPC classification number: G02B6/443 , G02B6/4486
Abstract: An optical fiber cable according to the present disclosure includes: a cable core having a plurality of optical fiber core wires; a sheath covering the cable core; and at least two or more tension members, having warping ability outward from an axial center of a cable core, disposed inside the sheath along the cable core, and any one of the tension members is disposed at a position laying along a position of another of the tension members with the axial center of the cable core sandwiched between the positions.
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公开(公告)号：US20240248001A1
公开(公告)日：2024-07-25
申请号：US18289233
申请日：2021-05-31
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yusuke YAMADA , Masashi KIKUCHI , Akira SAKURAI , Shigekatsu TETSUTANI , Hiroaki TANIOKA
IPC: G01M11/00
CPC classification number: G01M11/3109
Abstract: An object of the present invention is to provide an optical fiber testing method and an optical fiber winding device capable of appropriately reproducing the same lateral pressure and minute bending state in a test of an optical fiber as those in an optical cable.
In the optical fiber testing method according to the present invention, an optical fiber 51-2 of the second layer wound around a bobbin 12 is used as an object to be tested. Lateral pressure to the optical fiber 51-2 of the second layer is applied by an optical fiber 51-3 of the third layer. The lateral pressure is adjusted by a tension when the optical fiber 51-3 of the third layer is wound around the bobbin. In other words, since the lateral pressure is applied to the optical fiber to be tested from another optical fiber, the same lateral pressure and minute bending state as those in the optical cable can be reproduced.-
公开(公告)号：US20230314743A1
公开(公告)日：2023-10-05
申请号：US18009774
申请日：2020-06-16
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yuta MARUO , Hiroaki TANIOKA , Shigekatsu TETSUTANI , Yusuke YAMADA , Akira SAKURAI
IPC: G02B6/44
CPC classification number: G02B6/443
Abstract: The object of the present disclosure is to provide an optical fiber cable having a large contact area with the bottom surface of a rectangular groove and easily bent in at least two directions, as compared to an optical fiber cable having a circular cross-sectional shape perpendicular to a long axis direction. Therefore, the optical fiber cable of the present disclosure has three or more flat side surfaces in the long axis direction and two or more axes each having a minimum moment of inertia of area with respect to neutral planes.
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公开(公告)号：US20240302620A1
公开(公告)日：2024-09-12
申请号：US18289247
申请日：2021-05-31
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Masashi KIKUCHI , Shigekatsu TETSUTANI , Yusuke YAMADA , Akira SAKURAI , Hiroaki TANIOKA
IPC: G02B6/44
CPC classification number: G02B6/4482
Abstract: An optical fiber cable according to the present disclosure includes a cable core having one or a plurality of optical fiber core wires therein; an outer cover which covers the cable core and has a concave portion or a plurality of convex portions for an outer edge of a cross section perpendicular to a long axis direction of the outer cover; and an impression which is marked on the concave portion or on a portion sandwiched between the plurality of convex portions of a side surface of the outer cover.
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Patent Agency Ranking
公开(公告)号：US20230333340A1
公开(公告)日：2023-10-19
申请号：US18026845
申请日：2020-10-09
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yuta MARUO , Akira SAKURAI , Yusuke YAMADA , Shigekatsu TETSUTANI , Hiroaki TANIOKA
CPC classification number: G02B6/441 , G02B6/38875
Abstract: An optical cable according to the present disclosure has a structure in which at least one or more optical fiber cores and an interposition that prevents optical fibers from coming into contact with each other are bundled by a bundle tape.
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公开(公告)号：US20240329345A1
公开(公告)日：2024-10-03
申请号：US18579737
申请日：2022-08-24
Inventor： Yutaka HASHIMOTO , Fumiaki SATO , Masashi KIKUCHI , Soichi ISHIKAWA , Akira SAKURAI , Yusuke YAMADA , Sadaharu HOMAN
CPC classification number: G02B6/4403 , G02B6/02019 , G02B6/02395
Abstract: A core portion of each of optical fibers of an optical fiber cable is made of pure silica glass, an effective cross-sectional area of the core portion at a wavelength of 1550 nm is 110 μm2 or more and 150 μm2 or less. The optical fibers include an intermittent connection portion in which a connection portion to which an adhesive resin is applied and a non-connection portion to which the adhesive resin is not applied are alternately provided between adjacent optical fibers. The optical fiber ribbon has a ratio of a total adhesion length to which the adhesive resin is applied to a total length between all the optical fibers of 40% or more per a unit length of the optical fiber ribbon, and an occupancy ratio of the optical fiber ribbon to a cross-sectional area of the internal space is 30% or more and 40% or less.
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公开(公告)号：US20230076354A1
公开(公告)日：2023-03-09
申请号：US17798112
申请日：2020-02-28
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Akira SAKURAI , Hiroaki TANIOKA , Hisashi IZUMITA , Yusuke YAMADA , Yuta MARUO
Abstract: To surely fix an optical fiber cable including a nonmetallic tension member in a closure without damaging the tension member and a core. An optical fiber cable holding device according to the present disclosure includes: a thin plate portion configured, by bending a rectangular thin plate in a length direction thereof into a shape of a rough circle, to hold an outer periphery of an optical fiber cable; a binding mechanism portion fixed on one end of the thin plate portion and configured to bind and fix the thin plate portion wound around the optical fiber cable; protrusion fitting holes provided on the other end of the thin plate portion wound around the optical fiber cable; and a band-diameter adjuster fixed to the binding mechanism portion, including a protrusion to fittable into each of the protrusion fitting holes, and configured to adjust a diameter of the rough circle by changing from one hole to another hole of the protrusion fitting holes to be fitted onto the protrusion.
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公开(公告)号：US20230314744A1
公开(公告)日：2023-10-05
申请号：US18016890
申请日：2020-07-22
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yuta MARUO , Hiroaki TANIOKA , Shigekatsu TETSUTANI , Yusuke YAMADA , Akira SAKURAI
IPC: G02B6/44
CPC classification number: G02B6/443
Abstract: An optical fiber cable of the present disclosure is formed by assembling a plurality of drop optical cables, and each of the drop optical cables has a structure where at least one or more optical fiber cores and a tension fiber or a tension member is embedded in a sheath such that the drop optical cable has two or more axes each having a minimum value of a second moment of area with respect to arbitrary neutral planes, and even an optical cable obtained by assembling drop optical cables has a structure having two or more axes each having a minimum value of the second moment of area with respect to arbitrary neutral planes.
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公开(公告)号：US20230213724A1
公开(公告)日：2023-07-06
申请号：US17928140
申请日：2020-06-01
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Akira SAKURAI , Hiroaki TANIOKA , Hisashi IZUMITA , Shigekatsu TETSUTANI , Yusuke YAMADA , Yuta MARUO
IPC: G02B6/44
CPC classification number: G02B6/4451
Abstract: An object is to provide a closure with a structure having a drainage function to eliminate water immersion into a coated optical fiber against temporary flooding and to prevent water from continuously contacting the coated optical fiber. Another object is to provide a closure with improved workability for opening and closing.
A closure according to the present invention protects a connection part that connects a coated optical fiber enclosed in a optical fiber cable with a coated optical fiber enclosed in a optical fiber cable. The closure includes a coated optical fiber housing that divides an interior of the closure into a first space that is on a side of a road and has a main body cable insertion hole for inserting the optical fiber cables from an exterior and a second space that is on an opposite side of the road and includes the connection part. The coated optical fiber housing has a frustum shape with two bases each open and a base with a smaller area of the two bases protruding toward the side of the road. The base with the smaller area of the two bases is a cable insertion hole for inserting the optical fiber cable from the first space into the second space and is not in contact with a bottom surface of the first space on the side of the road.
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