Patents by Inventor Norihiro Momotsu
Norihiro Momotsu 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).
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Patent number: 11579396Abstract: An optical fiber protective unit includes: a reticulated tube having openings that are reticulately formed, the reticulated tube being configured to accommodate a plurality of optical fibers inserted through the reticulated tube; a tubular member disposed inside the reticulated tube, the tubular member being configured to accommodate the plurality of optical fibers through the tubular member; and a cylindrical member attached to an end part of the reticulated tube. The cylindrical member has an inner diameter that is larger than an outer diameter of the tubular member.Type: GrantFiled: September 18, 2019Date of Patent: February 14, 2023Assignee: Fujikura Ltd.Inventors: Rikimaru Takeda, Norihiro Momotsu
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Publication number: 20210349280Abstract: An optical fiber protective unit includes: a reticulated tube having openings that are reticulately formed, the reticulated tube being configured to accommodate a plurality of optical fibers inserted through the reticulated tube; a tubular member disposed inside the reticulated tube, the tubular member being configured to accommodate the plurality of optical fibers through the tubular member; and a cylindrical member attached to an end part of the reticulated tube. The cylindrical member has an inner diameter that is larger than an outer diameter of the tubular member.Type: ApplicationFiled: September 18, 2019Publication date: November 11, 2021Applicant: FUJIKURA LTD.Inventors: Rikimaru Takeda, Norihiro Momotsu
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Patent number: 10725261Abstract: An optical fiber-cable branch member includes: a branch member main body; a cable fixing portion that holds and fixes an end portion of a jacket of an optical fiber-cable onto the branch member main body; and a tube fixing portion that fixes a plurality of protective tubes onto the branch member main body. The optical fiber-cable includes a first optical fiber core bundle and the jacket, and the jacket coats an outer circumference of the first optical fiber core bundle and includes a tension-resisting member buried in a cable longitudinal direction. The plurality of protective tubes cover and protect respective outer circumferences of a plurality of second optical fiber core bundles obtained by branching the first optical fiber core bundle extending from the end portion of the jacket.Type: GrantFiled: May 31, 2016Date of Patent: July 28, 2020Assignee: Fujikura Ltd.Inventors: Terutake Kobayashi, Norihiro Momotsu
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Publication number: 20200049885Abstract: A jacket removal tool for an optical cable in which a rip cord is buried in a jacket is provided. The jacket removal tool includes: a blade that shaves the jacket; and a blade counterpart. An opening through which a part of the jacket shaved by the blade passes is disposed between the blade and the blade counterpart. The blade counterpart includes: a counter bottom surface along the optical cable; a counter side surface connected to the counter bottom surface; and an edge that connects the counter bottom surface and the counter side surface and that is disposed along a perpendicular line extending from a cutting edge of the blade with respect to the counter bottom surface. The edge is parallel to a blade line of the cutting edge.Type: ApplicationFiled: January 12, 2018Publication date: February 13, 2020Applicant: Fujikura Ltd.Inventors: Terutake Kobayashi, Norihiro Momotsu
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Patent number: 10481331Abstract: A reinforcement sleeve for connecting a plurality of optical fibers to each other by fusion splice includes: a base member; a cover member that sandwiches a fusion splice portion of the plurality of optical fibers between the cover member and the base member; a first adhesive layer disposed between the base member and the plurality of optical fibers; and a second adhesive layer disposed between the cover member and the plurality of optical fibers. A width of the reinforcement sleeve is defined by a reinforcement sleeve standard relating to a reinforcement sleeve, and a height of the reinforcement sleeve is 1/n of a height defined by the reinforcement sleeve standard, where n is an integer equal to or larger than 2.Type: GrantFiled: January 4, 2019Date of Patent: November 19, 2019Assignee: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu
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Patent number: 10459183Abstract: An optical wiring unit includes a plurality of drawers with optical adapters. Each of the drawers includes a first latch part and a second latch part. When any of the drawers are drawn out to a predetermined position, the first latch part of a drawn-out drawer latches on the second latch part of an adjacent drawer to lock the drawn-out drawer to the predetermined position.Type: GrantFiled: October 31, 2018Date of Patent: October 29, 2019Assignee: FUJIKURA LTD.Inventors: Ryoichi Mitobe, Norihiro Momotsu
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Publication number: 20190285822Abstract: A connection structure includes: a closure including an introduction tube; at least two optical cables inserted through the introduction tube; a seal that closes a gap between the introduction tube and each of the optical cables; and a holder disposed on a side opposite to the closure when seen from the seal. The holder fixes the at least two optical cables over a predetermined length.Type: ApplicationFiled: February 27, 2019Publication date: September 19, 2019Applicant: FUJIKURA LTD.Inventors: Yuichi Yoshida, Norihiro Momotsu, Katsushi Agata
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Publication number: 20190250331Abstract: A reinforcement sleeve for connecting a plurality of optical fibers to each other by fusion splice includes: a base member; a cover member that sandwiches a fusion splice portion of the plurality of optical fibers between the cover member and the base member; a first adhesive layer disposed between the base member and the plurality of optical fibers; and a second adhesive layer disposed between the cover member and the plurality of optical fibers. A width of the reinforcement sleeve is defined by a reinforcement sleeve standard relating to a reinforcement sleeve, and a height of the reinforcement sleeve is 1/n of a height defined by the reinforcement sleeve standard, where n is an integer equal to or larger than 2.Type: ApplicationFiled: January 4, 2019Publication date: August 15, 2019Applicant: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu
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Patent number: 10371911Abstract: An optical fiber cord includes: a multi-fiber cord section that includes an outer cover that encloses an optical fiber unit where a plurality of coated optical fibers are gathered; a plurality of branch cord sections where the coated optical fibers are housed in branch tubes; and a branch protection section that includes an exterior member that covers a branch portion where the plurality of coated optical fibers are branched from the multi-fiber cord section toward the branch cord sections.Type: GrantFiled: December 14, 2017Date of Patent: August 6, 2019Assignee: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu
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Patent number: 10310203Abstract: A grounding structure of an optical fiber cable that includes a sheath, a plurality of optical fibers housed in the sheath, and a first tension member and a second tension member embedded in the sheath so as to interpose the optical fibers therebetween in a radial direction includes: a conductive member that electrically connects a first extending portion of the first tension member and a second extending portion of the second tension member. The first extending portion and the second extending portion extends from an end portion of the sheath. A length of the second extending portion in a longitudinal direction of the optical fiber cable is greater than a length of the first extending portion in the longitudinal direction. The second extending portion is held by a tension member holding portion and is electrically connected to a grounding circuit.Type: GrantFiled: December 21, 2017Date of Patent: June 4, 2019Assignee: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu
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Publication number: 20190137713Abstract: An optical wiring unit includes a plurality of drawers with optical adapters. Each of the drawers includes a first latch part and a second latch part. When any of the drawers are drawn out to a predetermined position, the first latch part of a drawn-out drawer latches on the second latch part of an adjacent drawer to lock the drawn-out drawer to the predetermined position.Type: ApplicationFiled: October 31, 2018Publication date: May 9, 2019Applicant: FUJIKURA LTD.Inventors: Ryoichi Mitobe, Norihiro Momotsu
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Patent number: 10209474Abstract: A fiber arrangement member includes: a tubular housing that houses a plurality of optical fibers; and a plurality of guide portions extending from a first end in an axial direction of the housing toward side areas of the first end. The guide portions extend from the housing in different directions from each other crossing an axial line of the housing. The guide portions comprise guide grooves that house the optical fibers and communicate with an inner space of the housing. The grooves are open at sides of the grooves opposite to a second end in the axial direction of the housing on entire lengths in extending directions of the grooves. The grooves selectively house the optical fibers extended from the first end in the axial direction of the housing. The optical fibers housed in one of the grooves move into another of the grooves.Type: GrantFiled: January 5, 2018Date of Patent: February 19, 2019Assignee: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu, Terutake Kobayashi
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Patent number: 10175438Abstract: An optical fiber cord includes: a multi-fiber cord section that includes an outer cover that encloses an optical fiber unit where a plurality of coated optical fibers are gathered; a plurality of branch cord sections where the coated optical fibers are housed in branch tubes; and a branch protection section that includes an exterior member that covers a branch portion where the plurality of coated optical fibers are branched from the multi-fiber cord section toward the branch cord sections.Type: GrantFiled: December 14, 2017Date of Patent: January 8, 2019Assignee: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu
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Patent number: 10146019Abstract: An optical connector retaining unit includes: an optical connector retaining member that retains an optical connector of a distal end of an optical fiber in a connection standby state being optically connected to nothing; and a reflecting section that reflects visible light emitted from the distal end of the optical fiber after led into a proximal end of the optical fiber opposite to the distal end thereof provided with the optical connector, at an inclination angle of 45 degrees or less with respect to an optical axis of the emitted visible light, or a scattering section that scatters visible light emitted from the distal end of the optical fiber such that scattered light includes light within the inclination angle of 45 degrees or less with respect to the optical axis of the emitted visible light.Type: GrantFiled: January 5, 2018Date of Patent: December 4, 2018Assignee: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu, Terutake Kobayashi
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Publication number: 20180329167Abstract: An optical fiber-cable branch member includes: a branch member main body; a cable fixing portion that holds and fixes an end portion of a jacket of an optical fiber-cable onto the branch member main body; and a tube fixing portion that fixes a plurality of protective tubes onto the branch member main body. The optical fiber-cable includes a first optical fiber core bundle and the jacket, and the jacket coats an outer circumference of the first optical fiber core bundle and includes a tension-resisting member buried in a cable longitudinal direction. The plurality of protective tubes cover and protect respective outer circumferences of a plurality of second optical fiber core bundles obtained by branching the first optical fiber core bundle extending from the end portion of the jacket.Type: ApplicationFiled: May 31, 2016Publication date: November 15, 2018Applicant: FUJIKURA LTD.Inventors: Terutake Kobayashi, Norihiro Momotsu
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Patent number: 10120155Abstract: An optical fiber cable branch member includes a branch member main body, a cable-fixing portion which holds and fixes, onto the branch member main body, an end portion of a jacket of an optical fiber cable including a first optical fiber core bundle and the jacket which coats an outer circumference of the first optical fiber core bundle, and includes a tension resistance member buried in a cable longitudinal direction, a tube-fixing portion which fixes, onto the branch member main body, a plurality of protective tubes which respectively cover and protect respective outer circumferences of a plurality of second optical fiber core bundles obtained by branching the first optical fiber core bundle extending from the end portion of the jacket, and a main body-fixing portion which fixes the branch member main body onto an object to be attached.Type: GrantFiled: May 31, 2017Date of Patent: November 6, 2018Assignee: FUJIKURA LTD.Inventors: Sho Kishimoto, Norihiro Momotsu
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Publication number: 20180196211Abstract: An optical fiber cord includes: a multi-fiber cord section that includes an outer cover that encloses an optical fiber unit where a plurality of coated optical fibers are gathered; a plurality of branch cord sections where the coated optical fibers are housed in branch tubes; and a branch protection section that includes an exterior member that covers a branch portion where the plurality of coated optical fibers are branched from the multi-fiber cord section toward the branch cord sections.Type: ApplicationFiled: December 14, 2017Publication date: July 12, 2018Applicant: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu
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Publication number: 20180196214Abstract: A fiber arrangement member includes: a tubular housing that houses a plurality of optical fibers; and a plurality of guide portions extending from a first end in an axial direction of the housing toward side areas of the first end. The guide portions extend from the housing in different directions from each other crossing an axial line of the housing. The guide portions comprise guide grooves that house the optical fibers and communicate with an inner space of the housing. The grooves are open at sides of the grooves opposite to a second end in the axial direction of the housing on entire lengths in extending directions of the grooves. The grooves selectively house the optical fibers extended from the first end in the axial direction of the housing. The optical fibers housed in one of the grooves move into another of the grooves.Type: ApplicationFiled: January 5, 2018Publication date: July 12, 2018Applicant: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu, Terutake Kobayashi
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Publication number: 20180196204Abstract: An optical connector retaining unit includes: an optical connector retaining member that retains an optical connector of a distal end of an optical fiber in a connection standby state being optically connected to nothing; and a reflecting section that reflects visible light emitted from the distal end of the optical fiber after led into a proximal end of the optical fiber opposite to the distal end thereof provided with the optical connector, at an inclination angle of 45 degrees or less with respect to an optical axis of the emitted visible light, or a scattering section that scatters visible light emitted from the distal end of the optical fiber such that scattered light includes light within the inclination angle of 45 degrees or less with respect to the optical axis of the emitted visible light.Type: ApplicationFiled: January 5, 2018Publication date: July 12, 2018Applicant: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu, Terutake Kobayashi
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Publication number: 20180196212Abstract: A grounding structure of an optical fiber cable that includes a sheath, a plurality of optical fibers housed in the sheath, and a first tension member and a second tension member embedded in the sheath so as to interpose the optical fibers therebetween in a radial direction includes: a conductive member that electrically connects a first extending portion of the first tension member and a second extending portion of the second tension member. The first extending portion and the second extending portion extends from an end portion of the sheath. A length of the second extending portion in a longitudinal direction of the optical fiber cable is greater than a length of the first extending portion in the longitudinal direction. The second extending portion is held by a tension member holding portion and is electrically connected to a grounding circuit.Type: ApplicationFiled: December 21, 2017Publication date: July 12, 2018Applicant: FUJIKURA LTD.Inventors: Katsushi Agata, Norihiro Momotsu