公开(公告)号：US20210223491A1

公开(公告)日：2021-07-22

申请号：US17255581

申请日：2019-10-09

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

Abstract: An optical fiber cable includes: a sheath; and a core that is housed in the sheath and includes an intermittently-adhered optical fiber ribbon including optical fibers and adhesive portions for intermittently adhering the optical fibers in a longitudinal direction. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The recesses each include: two connecting portions respectively connected to radial inner ends of two adjacent protrusions; and a bottom surface positioned between the two connecting portions.

公开(公告)号：US20230418013A1

公开(公告)日：2023-12-28

申请号：US18464463

申请日：2023-09-11

Applicant: Fujikura Ltd.

Inventor： Akira Namazue ,  Shogo Shimizu ,  Go Taki ,  Okimi Mukai ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/443 ,  G02B6/4431

Abstract: An optical fiber cable includes: a sheath including recesses and protrusions that are alternately disposed in a circumferential direction on an outer circumferential surface of the sheath; a core that includes optical fibers and is accommodated in the sheath; tensile strength members embedded in the sheath; and a ripcord that is embedded in the sheath. A marking portion protruding outward in a radial direction is disposed in the sheath. The ripcord is disposed between the marking portion and the core.

公开(公告)号：US11782228B2

公开(公告)日：2023-10-10

申请号：US17268313

申请日：2020-12-04

Applicant: Fujikura Ltd.

Inventor： Akira Namazue ,  Shogo Shimizu ,  Go Taki ,  Okimi Mukai ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/443 ,  G02B6/4431

Abstract: An optical fiber cable includes: a sheath including recesses and protrusions that are alternately disposed in a circumferential direction on an outer circumferential surface of the sheath; a core that includes optical fibers and is accommodated in the sheath; and tensile strength members embedded in the sheath. The core is interposed between the tensile strength members in a transverse cross-sectional view. In the transverse cross-sectional view, the tensile strength members are embedded in portions of the sheath facing outward from the core in a first direction in which the two tensile strength members face each other in the transverse cross-sectional view.

公开(公告)号：US11709329B2

公开(公告)日：2023-07-25

申请号：US17671886

申请日：2022-02-15

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/4432 ,  G02B6/4403 ,  G02B6/4405 ,  G02B6/441 ,  G02B6/4404

Abstract: An optical fiber cable includes: a sheath; a core that is housed in the sheath and comprises optical fibers; tensile strength members embedded in the sheath; and ripcords embedded in the sheath. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The recesses each include: two connecting portions respectively connected to radial inner ends of two adjacent protrusions; and a bottom surface positioned between the two connecting portions. In a transverse cross-sectional view, the ripcords are positioned inside some of the protrusions, and the tensile strength members are positioned inside the remaining protrusions.

公开(公告)号：US11287591B2

公开(公告)日：2022-03-29

申请号：US17255581

申请日：2019-10-09

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

Abstract: An optical fiber cable includes: a sheath; and a core that is housed in the sheath and includes an intermittently-adhered optical fiber ribbon including optical fibers and adhesive portions for intermittently adhering the optical fibers in a longitudinal direction. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The recesses each include: two connecting portions respectively connected to radial inner ends of two adjacent protrusions; and a bottom surface positioned between the two connecting portions.

公开(公告)号：US20230350145A1

公开(公告)日：2023-11-02

申请号：US18350446

申请日：2023-07-11

Applicant: FUJIKURA LTD.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/4432 ,  G02B6/4403 ,  G02B6/4405 ,  G02B6/4404 ,  G02B6/441

Abstract: An optical fiber cable includes: a sheath; a core that is housed in the sheath and comprises optical fibers; tensile strength members embedded in the sheath; and ripcords embedded in the sheath. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The recesses each include: two connecting portions respectively connected to radial inner ends of two adjacent protrusions; and a bottom surface positioned between the two connecting portions. In a transverse cross-sectional view, the ripcords are positioned inside some of the protrusions, and the tensile strength members are positioned inside the remaining protrusions.

公开(公告)号：US20230350144A1

公开(公告)日：2023-11-02

申请号：US18331602

申请日：2023-06-08

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/4432 ,  G02B6/4403 ,  G02B6/4405 ,  G02B6/4404 ,  G02B6/441

Abstract: An optical fiber cable includes: a sheath; and a core that is housed in the sheath and includes optical fibers. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The optical fiber cable has a compressive strength of 12.8 N/mm2 or greater and 32.4 N/mm2 or less.

公开(公告)号：US20220342172A1

公开(公告)日：2022-10-27

申请号：US17763950

申请日：2020-11-09

Applicant: Fujikura Ltd.

Inventor： Masatoshi Ohno ,  Okimi Mukai ,  Go Taki ,  Shogo Shimizu ,  Ryo Inagaki ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44 ,  G02B6/25

Abstract: A method of exposing a core of an optical fiber cable that includes: a core including an optical fiber; a wrapping tube wrapping the core; a jacket housing the core and the wrapping tube; and a tension-resisting member of a Fiber Reinforced Plastic (FRP) embedded in the jacket, includes: making a cut in a circumferential direction in the jacket at a position closer to a first end portion of the optical fiber cable than to a second end portion of the optical fiber cable in a longitudinal direction; bending the optical fiber cable at a portion having the cut and fracturing the tension-resisting member; and removing a removal portion of the jacket that is disposed between the cut and the first end portion.

公开(公告)号：US20200073068A1

公开(公告)日：2020-03-05

申请号：US16610018

申请日：2018-05-09

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Akira Namazue ,  Go Taki ,  Ken Osato

IPC: G02B6/44 ,  G02B6/48

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.

公开(公告)号：US20240329348A1

公开(公告)日：2024-10-03

申请号：US18580021

申请日：2022-04-19

Applicant: Fujikura Ltd.

Inventor： Shogo Shimizu ,  Soichiro Kaneko ,  Akira Namazue ,  Ken Osato

IPC: G02B6/44

CPC classification number: G02B6/4433 ,  G02B6/449

Abstract: An optical cable includes optical fiber units each including a bundle of optical fibers. The optical fiber units are twisted together in an S-Z configuration in which a twisting direction of the optical fiber units is reversed at a reversal part and an adjacent reversal part adjacent to the reversal part. A twisting angle, by which the optical fiber units are twisted in a circumferential direction between the reversal part and the adjacent reversal part, is 540 degrees or greater.