Patents by Inventor Kazuyuki Sohma

Kazuyuki Sohma 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).

  • Publication number: 20190384000
    Abstract: An optical fiber according to an embodiment comprises, as a structure suitable for large capacity transmission over a long haul, a core, a cladding having an outer diameter of 80 ?m or more and 130 ?m or less, a primary coating, and a secondary coating having elasticity higher than that of the primary coating and an outer diameter of 210 ?m or less. The optical fiber having the structure as described above has an MFD of 10 ?m or more at a wavelength of 1550 nm, a cable cutoff wavelength longer than 1260 nm, and a microbending loss of 0.6 dB/km or less at a wavelength of 1550 nm.
    Type: Application
    Filed: August 23, 2019
    Publication date: December 19, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yoshiaki TAMURA, Kazuyuki SOHMA, Takemi HASEGAWA
  • Patent number: 10509161
    Abstract: An optical fiber includes an optical transmission medium comprising a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, and 1.1 ppm or less of a phosphorus compound and 2.5% by mass or less of a phenol compound based on the total amount of the primary resin layer are contained in the primary resin layer.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: December 17, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kensaku Shimada, Kazuyuki Sohma, Yuya Homma
  • Patent number: 10451796
    Abstract: Provided is an optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding. A Young's modulus of the primary coating layer is 0.1 to 1.0 MPa, a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H2?3×1017 N?1 m?6, the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus, and the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000. The formulas include H = H g + H s = ? ? ? r g 4 ? E g + ? ? ( r s ? 4 - r p 4 ) ? E s ? ? and D = 0.897 ? E p + 2.873 ? ( E s - E p ) ? ( E p E s ) 0.8311 ? ( 2 ? r s - r p r s - r g ) 1.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: October 22, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tadashi Enomoto, Takashi Fujii, Tomoyuki Hattori, Kazuyuki Sohma
  • Patent number: 10358577
    Abstract: In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter ET(30) of the resin composition is 47 to 61.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: July 23, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya Homma, Kazuyuki Sohma, Kensaku Shimada
  • Publication number: 20190187366
    Abstract: Provided is an optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding. A Young's modulus of the primary coating layer is 0.1 to 1.0 MPa, a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H2?3×1017 N?1m?6, the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus, and the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000. The formulas include H = H g + H s = ? ? ? r g 4 ? E g + ? ? ( r s ? 4 - r p 4 ) ? E s ? ? and D = 0.897 ? E p + 2.873 ? ( E s - E p ) ? ( E p E s ) 0.8311 ? ( 2 ? r s - r p r s - r g ) 1.
    Type: Application
    Filed: August 2, 2017
    Publication date: June 20, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tadashi ENOMOTO, Takashi FUJII, Tomoyuki HATTORI, Kazuyuki SOHMA
  • Publication number: 20190179081
    Abstract: A splicing structure of optical fibers in which optical fibers are coupled together, the optical fibers each comprising: a coated fiber portion including a glass fiber and a coating layer coating an outer periphery of the glass fiber; and a bare fiber portion where a certain length of the glass fiber is projected from an end face of the coating layer in an extending direction, wherein the glass fiber end faces of the bare fiber portion are fusion coupled together, and an outer periphery of the bare fiber portion is coated by a recoating layer, the recoating layer is a cured product of an ultraviolet light curable resin composition including a urethane (meth)acrylate oligomer and a mold release agent, and a content of the mold release agent is 0.01 to 1.5% by mass based on a total amount of the ultraviolet light curable resin composition.
    Type: Application
    Filed: December 6, 2018
    Publication date: June 13, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kensaku SHIMADA, Kazuyuki SOHMA
  • Publication number: 20190127605
    Abstract: In an ultraviolet-curable resin composition for an optical fiber coating, the polarity parameter ET(30) of the resin composition is 47 to 61.
    Type: Application
    Filed: October 25, 2018
    Publication date: May 2, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya HOMMA, Kazuyuki SOHMA, Kensaku SHIMADA
  • Publication number: 20190064433
    Abstract: An optical fiber comprising: a glass fiber including a core and a cladding; and a coating layer coating an outer periphery of the glass fiber; wherein the coating layer includes a primary coating layer and a secondary coating layer, and a hardness at a depth of 200 nm from a surface of the secondary coating layer, HIT-200 nm, is 0.02 to 0.20 GPa as measured with a nano indenter.
    Type: Application
    Filed: August 23, 2018
    Publication date: February 28, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya HOMMA, Kazuyuki SOHMA, Kensaku SHIMADA
  • Publication number: 20190064434
    Abstract: An optical fiber includes an optical transmission medium comprising a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, and 1.1 ppm or less of a phosphorus compound and 2.5% by mass or less of a phenol compound based on the total amount of the primary resin layer are contained in the primary resin layer.
    Type: Application
    Filed: August 23, 2018
    Publication date: February 28, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kensaku SHIMADA, Kazuyuki SOHMA, Yuya HOMMA
  • Patent number: 10162108
    Abstract: An optical fiber includes an optical transmission medium having a core and a cladding, a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium, and a secondary resin layer coating the primary resin layer, wherein a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C., and the primary resin layer comprises a cured product of an ultraviolet light curable resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and a ?-diketone compound, and tin.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: December 25, 2018
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya Homma, Kazuyuki Sohma, Kensaku Shimada
  • Patent number: 10048436
    Abstract: An optical fiber includes an optical transmission medium having a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer and a photopolymerization initiator, and a compound containing phosphorus and tin as constituent atoms; and a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: August 14, 2018
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya Homma, Kazuyuki Sohma, Kensaku Shimada
  • Publication number: 20180128970
    Abstract: An optical fiber includes an optical transmission medium having a core and a cladding; a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium; and a secondary resin layer coating the primary resin layer, wherein the primary resin layer comprises a cured product of an ultraviolet light curable resin composition comprising a urethane (meth)acrylate oligomer, a monomer and a photopolymerization initiator, and a compound containing phosphorus and tin as constituent atoms; and a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C.
    Type: Application
    Filed: November 8, 2017
    Publication date: May 10, 2018
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya HOMMA, Kazuyuki SOHMA, Kensaku SHIMADA
  • Publication number: 20180105462
    Abstract: A manufacturing method of an optical fiber includes forming an optical fiber by forming a plurality of resin-coating layers around a glass fiber including a core part and a cladding part, and forming a marking on an outermost layer, which is a colored layer having pigment, of the plurality of resin-coating layers by melting or scorching a surface of the outermost layer with a laser.
    Type: Application
    Filed: October 12, 2017
    Publication date: April 19, 2018
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kensaku SHIMADA, Kazuyuki SOHMA, Yuya HOMMA
  • Publication number: 20180095221
    Abstract: An optical fiber includes an optical transmission medium having a core and a cladding, a primary resin layer disposed in contact with the optical transmission medium to coat the optical transmission medium, and a secondary resin layer coating the primary resin layer, wherein a Young's modulus of the primary resin layer is 0.5 MPa or less at 23° C., and the primary resin layer comprises a cured product of an ultraviolet light curable resin composition containing a urethane (meth)acrylate oligomer, a monomer, a photopolymerization initiator and a ?-diketone compound, and tin.
    Type: Application
    Filed: September 27, 2017
    Publication date: April 5, 2018
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yuya HOMMA, Kazuyuki SOHMA, Kensaku SHIMADA
  • Patent number: 9746605
    Abstract: An optical fiber 1A comprises an optical transmission member 10 including a core 12 and a clad 14, a primary resin layer 22, and a secondary resin layer 24. The effective area of the optical transmission member 10 is 130 ?m2 or larger. The transmission loss of the optical transmission member 10 at a wavelength of 1550 nm is 0.165 dB/km or smaller. The Young's modulus of the primary resin layer 22 is 0.7 MPa or lower, and the Young's modulus of the secondary resin layer 24 is 600 MPa or higher and 1500 MPa or lower. The difference between the transmission loss when the optical fiber 1A is wound at a tension of 80 g around a bobbin on which a metal mesh member having vertical wires of a 50-?m diameter and horizontal wires of a 50-?m diameter are wound and spaced at a pitch of 150 ?m, and the transmission loss of an optical fiber coil is 1.0 dB/km or smaller.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: August 29, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuyuki Sohma, Takehiko Kawano, Noriaki Iwaguchi, Takashi Fujii
  • Patent number: 9733425
    Abstract: A process for producing an optical fiber including a glass fiber, a primary resin coating layer which covers the periphery of the glass fiber, and a secondary resin coating layer which covers the periphery of the primary resin coating layer, wherein the primary resin coating layer is formed by curing a curable resin composition which includes one or more oligomers, one or more monomers, and a reaction initiator, the curable resin composition containing a one-end-capped oligomer in an amount of 30% by mass or larger based on all the oligomers. The optical fiber produced by this production process does not deteriorate in low-temperature transmission loss, because the primary resin coating layer is inhibited from generating voids even when having a low Young's modulus.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: August 15, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuyuki Sohma, Noriaki Iwaguchi, Takashi Fujii
  • Publication number: 20170031092
    Abstract: An optical fiber IA comprises an optical transmission member 10 including a core 12 and a clad 14, a primary resin layer 22, and a secondary resin layer 24. The effective area of the optical transmission member 10 is 130 ?m2 or larger. The transmission loss of the optical transmission member 10 at a wavelength of 1550 nm is 0.165 dB/km or smaller. The Young's modulus of the primary resin layer 22 is 0.7 MPa or lower, and the Young's modulus of the secondary resin layer 24 is 600 MPa or higher and 1500 MPa or lower. The difference between the transmission loss when the optical fiber 1A is wound at a tension of 80 g around a bobbin on which a metal mesh member having vertical wires of a 50-?m diameter and horizontal wires of a 50-?m diameter are wound and spaced at a pitch of 150 ?m, and the transmission loss of an optical fiber coil is 1.0 dB/km or smaller.
    Type: Application
    Filed: May 12, 2015
    Publication date: February 2, 2017
    Inventors: Kazuyuki SOHMA, Takehiko KAWANO, Noriaki IWAGUCHI, Takashi FUJII
  • Patent number: 9297950
    Abstract: Provided is an optical fiber which is provided with heat resistance and productivity and in which a transmission loss is suppressed even in a high-temperature environment. It has, on an outer periphery of a glass fiber composed of a core part and a cladding part, a coating layer made by crosslinking an energy-curable resin composition containing a silicon compound, in which the silicon compound contained in the energy-curable resin composition of the coating layer as an outermost layer has a specified structure having a cyclic silicone site having an epoxy group and a linear silicone site, with the content of the cyclic silicone site in the compound being from 10 to 30% by mass.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: March 29, 2016
    Assignees: SUMITOMO ELECTRIC INDUSTRIES, LTD., ADEKA CORPORATION
    Inventors: Kazuyuki Sohma, Tomoyuki Hattori, Takashi Sueyoshi, Seiichi Saito, Koichi Sakamaki
  • Publication number: 20160047977
    Abstract: A process for producing an optical fiber including a glass fiber, a primary resin coating layer which covers the periphery of the glass fiber, and a secondary resin coating layer which covers the periphery of the primary resin coating layer, wherein the primary resin coating layer is formed by curing a curable resin composition which includes one or more oligomers, one or more monomers, and a reaction initiator, the curable resin composition containing a one-end-capped oligomer in an amount of 30% by mass or larger based on all the oligomers. The optical fiber produced by this production process does not deteriorate in low-temperature transmission loss, because the primary resin coating layer is inhibited from generating voids even when having a low Young's modulus.
    Type: Application
    Filed: August 11, 2015
    Publication date: February 18, 2016
    Inventors: Kazuyuki SOHMA, Noriaki IWAGUCHI, Takashi FUJII
  • Patent number: 9229159
    Abstract: An optical fiber 1 comprising a core layer 2 composed of a silica based glass, a clad layer 3 formed on the outer circumference of the core layer 2 by curing a curable resin composition, and an ink layer 4 formed around the clad layer 3, wherein adhesive force between the core layer 2 and the clad layer 3 being from 1.5 g/mm to 4.0 g/mm.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: January 5, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuyuki Sohma, Yuya Homma, Itaru Sakabe