Patents by Inventor Minoru Kasahara

Minoru Kasahara 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: 20240116808
    Abstract: A colored optical fiber includes a bare optical fiber, a primary layer formed of a first ultraviolet curing resin covering the bare optical fiber and a secondary layer formed of a second ultraviolet curing resin covering the primary layer. An outer diameter of the secondary layer is smaller than or equal to 210 ?m. A Young's modulus of the primary layer is smaller than or equal to 88% with respect to a saturated Young's modulus of the primary layer.
    Type: Application
    Filed: December 12, 2023
    Publication date: April 11, 2024
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kuniaki ISHIZUKI, Minoru KASAHARA, Mitsuhiro IWAYA
  • Patent number: 11914205
    Abstract: The present invention satisfies at least one of the condition of the degree of freedom of a primary layer 11 shown in the equation (I) and the condition of the rigidity of a secondary layer 12 shown in the equation (II). Thus, a coated optical fiber 1 capable of suppressing transmission loss in a low temperature environment is provided, in which, even when an optical fiber 10 having a large effective core cross-sectional area Aeff of the optical fiber 10 at a wavelength of 1550 nm and having high microbend sensitivity is used, transmission loss in a low temperature environment can be suppressed. [Math.
    Type: Grant
    Filed: August 23, 2022
    Date of Patent: February 27, 2024
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Minoru Kasahara, Yoshihiro Arashitani, Kouji Mochiduki, Masahiro Yabe
  • Publication number: 20230418015
    Abstract: A colored optical fiber comprises a bare optical fiber, a primary layer formed of a first ultraviolet curing resin covering the bare optical fiber, and a secondary layer formed of a second ultraviolet curing resin covering the primary layer, wherein a Young's modulus of the primary layer is smaller than 70% with respect to a saturated Young's modulus of the primary layer, and wherein the saturated Young's modulus of the primary layer is smaller than or equal to 0.85 MPa.
    Type: Application
    Filed: September 7, 2023
    Publication date: December 28, 2023
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kuniaki ISHIZUKI, Minoru KASAHARA, Mitsuhiro IWAYA
  • Publication number: 20230358949
    Abstract: An optical fiber includes: a core portion made of glass; a side core layer made of glass and enclosing the core portion; a cladding portion made of glass and enclosing the side core layer; and a coating layer including a primary layer made of resin and enclosing the cladding portion, and a secondary layer made of resin and enclosing the primary layer. The relationships ?1>?Clad>?2 and 0>?2 are satisfied where ?1 represents relative refractive-index difference of average maximum refractive index of the core portion with respect to average refractive index of the cladding portion, ?2 represents relative refractive-index difference of average refractive index of the side core layer with respect to average refractive index of the cladding portion, and ?Clad represents relative refractive-index difference of average refractive index of the cladding portion with respect to refractive index of pure silica glass.
    Type: Application
    Filed: July 17, 2023
    Publication date: November 9, 2023
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kazunori MUKASA, Minoru KASAHARA, Keiichi AISO, Yukihiro TSUCHIDA, Naoya YOMOGITA, Takumi SUGANE, Ichihiko SUGANUMA, Tomoaki GONOHE, Mitsuhiro IWAYA, Zoltan VARALLYAY, Tamas MIHALFFY
  • Publication number: 20230257301
    Abstract: Provided is a colored optical fiber of which a primary layer is easily formed. The colored optical fiber includes a bare optical fiber, a primary layer formed of an ultraviolet curing resin covering the bare optical fiber, and a secondary layer formed of an ultraviolet curing resin covering the primary layer. Young's modulus of the primary layer is smaller than 70% with respect to a saturated Young's modulus of the primary layer. The saturated Young's modulus of the primary layer is larger than or equal to 0.84 MPa.
    Type: Application
    Filed: April 24, 2023
    Publication date: August 17, 2023
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kuniaki ISHIZUKI, Minoru KASAHARA, Mitsuhiro IWAYA
  • Publication number: 20220397732
    Abstract: The present invention satisfies at least one of the condition of the degree of freedom of a primary layer 11 shown in the equation (I) and the condition of the rigidity of a secondary layer 12 shown in the equation (II). Thus, a coated optical fiber 1 capable of suppressing transmission loss in a low temperature environment is provided, in which, even when an optical fiber 10 having a large effective core cross-sectional area Aeff of the optical fiber 10 at a wavelength of 1550 nm and having high microbend sensitivity is used, transmission loss in a low temperature environment can be suppressed. [Math.
    Type: Application
    Filed: August 23, 2022
    Publication date: December 15, 2022
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Minoru KASAHARA, Yoshihiro ARASHITANI, Kouji MOCHIDUKI, Masahiro YABE
  • Patent number: 11435518
    Abstract: Provided is a coated optical fiber and an optical fiber cable capable of suppressing transmission loss (microbend loss) even in an optical fiber having high microbend sensitivity. In the present invention, the degree of freedom of a primary layer 11 represented by the equation (I) and the rigidity of a secondary layer 12 represented by the equation (II) are set in specific ranges, respectively. Thus, the present invention provides a coated optical fiber 1 capable of suppressing the transmission loss even when an optical fiber 10 having high microbend sensitivity such as a BI fiber having a large effective core cross-sectional area Aeff of an optical fiber is used. The present invention can be widely used as a coated optical fiber 1 constituting a coated optical fiber ribbon or as a coated optical fiber 1 housed in an optical fiber cable. Further, an optical fiber cable including such coated optical fibers 1 enjoys the effect of the above-described coated optical fiber 1. [Math.
    Type: Grant
    Filed: March 12, 2021
    Date of Patent: September 6, 2022
    Assignee: FURUKAWA ELECTRIC CO. LTD.
    Inventors: Minoru Kasahara, Yoshihiro Arashitani, Kouji Mochiduki, Masahiro Yabe
  • Publication number: 20210199883
    Abstract: Provided is a coated optical fiber and an optical fiber cable capable of suppressing transmission loss (microbend loss) even in an optical fiber having high microbend sensitivity. In the present invention, the degree of freedom of a primary layer 11 represented by the equation (I) and the rigidity of a secondary layer 12 represented by the equation (II) are set in specific ranges, respectively. Thus, the present invention provides a coated optical fiber 1 capable of suppressing the transmission loss even when an optical fiber 10 having high microbend sensitivity such as a BI fiber having a large effective core cross-sectional area Aeff of an optical fiber is used. The present invention can be widely used as a coated optical fiber 1 constituting a coated optical fiber ribbon or as a coated optical fiber 1 housed in an optical fiber cable. Further, an optical fiber cable including such coated optical fibers 1 enjoys the effect of the above-described coated optical fiber 1. [Math.
    Type: Application
    Filed: March 12, 2021
    Publication date: July 1, 2021
    Applicant: FURUKAWA ELECTRIC CO. LTD.
    Inventors: Minoru KASAHARA, Yoshihiro ARASHITANI, Kouji MOCHIDUKI, Masahiro YABE
  • Patent number: 9846292
    Abstract: The purpose of the present invention is to provide, by a configuration or method different from conventional art, a coated optical fiber enabling reduced interface delamination between a glass fiber and a primary coating layer when the coated optical fiber is immersed in water, and a reduction of transmission loss increase. A coated optical fiber according to one embodiment of the present invention is provided with a glass fiber, a primary coating layer coated on the glass fiber, a secondary coating layer coated on the primary coating layer, and a colored layer coated on the secondary coating layer. The coated optical fiber is configured so that small water bubbles are generated substantially evenly within the primary coating layer when the coated optical fiber is immersed for 200 days in warm water of 60° C.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: December 19, 2017
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Minoru Kasahara, Minoru Saito, Yoshihiro Arashitani
  • Patent number: 9841558
    Abstract: The present invention provides a two-layer structure colored optical fiber which includes a colored secondary coating layer improved in collectability and separability. The two-layer structure colored optical fiber in an embodiment of the present invention includes a glass optical fiber, a primary coating layer coating the glass optical fiber, and a colored secondary coating layer coating the primary coating layer. The secondary coating layer has such characteristics that a surface cure percentage is 99% or more at an infrared absorption peak of a wave number of 1407 cm?1 and a surface kinetic friction force in Knot Test is less than 0.075 N.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: December 12, 2017
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Hiroki Tanaka, Minoru Kasahara, Junpei Watanabe, Kenichi Suyama, Yoshihiro Arashitani
  • Publication number: 20170131511
    Abstract: The present invention provides a two-layer structure colored optical fiber which includes a colored secondary coating layer improved in collectability and separability. The two-layer structure colored optical fiber in an embodiment of the present invention includes a glass optical fiber, a primary coating layer coating the glass optical fiber, and a colored secondary coating layer coating the primary coating layer. The secondary coating layer has such characteristics that a surface cure percentage is 99% or more at an infrared absorption peak of a wave number of 1407 cm?1 and a surface kinetic friction force in Knot Test is less than 0.075 N.
    Type: Application
    Filed: January 13, 2017
    Publication date: May 11, 2017
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Hiroki TANAKA, Minoru KASAHARA, Junpei WATANABE, Kenichi SUYAMA, Yoshihiro ARASHITANI
  • Publication number: 20170107145
    Abstract: A method of producing an optical fiber, containing: (a) a resin application step of applying an ultraviolet curable resin, onto an outer circumference of an optical fiber; (b) a heating step of heating the ultraviolet curable resin; and (c) a light irradiation step of irradiating the ultraviolet curable resin with ultraviolet light emitted from a semiconductor light emitting element, in a state in which the ultraviolet curable resin is heated, to cure the ultraviolet curable resin into a coating resin.
    Type: Application
    Filed: December 23, 2016
    Publication date: April 20, 2017
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kenichi SUYAMA, Yoshihiro ARASHITANI, Hiroki TANAKA, Minoru KASAHARA, Kazuyoshi AKIZUKI
  • Patent number: 9291769
    Abstract: A colored optical fiber including a glass optical fiber; a primary coating layer that covers the glass optical fiber; a secondary coating layer that covers the primary coating layer; and a colored layer that coats the secondary coating layer. The relaxation modulus after 24 hours at 60° C. of of the layers coated is 140 MPa or less.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: March 22, 2016
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Hiroki Tanaka, Minoru Saito, Minoru Kasahara, Yasuo Nakajima, Yoshihiro Arashitani
  • Patent number: 9292768
    Abstract: Provided is a label data generating method of generating label data to create a label by printing a printing image on a tape-shaped member, the method comprising: setting sequential printing for creating the labels by printing a plurality of types of printing images based on each item of individual information which is sequentially read from an information list including the plurality of items of individual information; setting the number of printed copies; and generating the label data so that a plurality of copies of the labels are created, wherein in the generating of the label data, the label data is generated so that the label data creating apparatus performs non-sequential printing that prints the plurality of types of printing images respectively printed for a plurality of copies by the sequential printing in a sequence in which the same printing images are collected for a plurality of copies.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: March 22, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Mikihiro Kajihara, Akinori Tsuji, Minoru Kasahara, Junpei Watanabe
  • Publication number: 20150293325
    Abstract: The purpose of the present invention is to provide, by a configuration or method different from conventional art, a coated optical fiber enabling reduced interface delamination between a glass fiber and a primary coating layer when the coated optical fiber is immersed in water, and a reduction of transmission loss increase. A coated optical fiber according to one embodiment of the present invention is provided with a glass fiber, a primary coating layer coated on the glass fiber, a secondary coating layer coated on the primary coating layer, and a colored layer coated on the secondary coating layer. The coated optical fiber is configured so that small water bubbles are generated substantially evenly within the primary coating layer when the coated optical fiber is immersed for 200 days in warm water of 60° C.
    Type: Application
    Filed: June 4, 2014
    Publication date: October 15, 2015
    Applicant: Furukawa Electric Co., Ltd.
    Inventors: Minoru KASAHARA, Minoru SAITO, Yoshihiro ARASHITANI
  • Patent number: 9025924
    Abstract: The present invention provides an optical fiber in which transmission loss is not easily increased when the optical fiber is dipped in water and then dried and also which has a solvent resistant property and a micro-bend resistant property. An optical fiber according to one embodiment of the present invention is an optical fiber in which at least two layers of coating resin coat the circumference of a glass optical fiber. When a Yang's modulus of the first coating layer of the coating resin is defined by PY (MPa) and an elution rate of the coating resin after dipping in 60° C. hot water for 168 hours is defined by E (mass·%), a formula of 1.8?E?8.61×PY+1.40 is satisfied.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: May 5, 2015
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Minoru Saito, Minoru Kasahara, Kouji Mochizuki, Hiroki Tanaka, Yasuo Nakajima
  • Publication number: 20140307269
    Abstract: Provided is a display control method including: obtaining an attachment position image which is an image of an attachment position to which a label having a printing image printed on a printing medium is attached; generating a preview image of the label on which the printing image is printed; generating a synthesized image obtained by overlapping the attachment position image and the preview image; displaying the synthesized image on a display portion; receiving an operation from a user to change the synthesized image in a state where the synthesized image is displayed on the display portion; and displaying the changed synthesized image on the display portion, based on the operation in the receiving of the operation.
    Type: Application
    Filed: April 9, 2014
    Publication date: October 16, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Naofumi Hirabayashi, Minoru Kasahara, Junpei Watanabe
  • Publication number: 20140307273
    Abstract: Provided is a label data generating method of generating label data to create a label by printing a printing image on a tape-shaped member, the method comprising: setting sequential printing for creating the labels by printing a plurality of types of printing images based on each item of individual information which is sequentially read from an information list including the plurality of items of individual information; setting the number of printed copies; and generating the label data so that a plurality of copies of the labels are created, wherein in the generating of the label data, the label data is generated so that the label data creating apparatus performs non-sequential printing that prints the plurality of types of printing images respectively printed for a plurality of copies by the sequential printing in a sequence in which the same printing images are collected for a plurality of copies.
    Type: Application
    Filed: April 10, 2014
    Publication date: October 16, 2014
    Applicant: Seiko Epson Corporation
    Inventors: Mikihiro Kajihara, Akinori Tsuji, Minoru Kasahara, Junpei Watanabe
  • Publication number: 20140301704
    Abstract: A colored optical fiber including a glass optical fiber; a primary coating layer that covers the glass optical fiber; a secondary coating layer that covers the primary coating layer; and a colored layer that coats the secondary coating layer. The relaxation modulus after 24 hours at 60° C. of of the layers coated is 140 MPa or less.
    Type: Application
    Filed: June 19, 2014
    Publication date: October 9, 2014
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Hiroki TANAKA, Minoru SAITO, Minoru KASAHARA, Yasuo NAKAJIMA, Yoshihiro ARASHITANI
  • Publication number: 20140226941
    Abstract: The present invention provides a colored optical fiber that shows anti-microbend property and hot-water resistance, an optical fiber ribbon that utilizes the same, and an optical fiber cable. It is a colored optical fiber 1, which comprises two coating layers of a primary coating layer 31 and a secondary coating layer 32, wherein either one of the primary coating layer 31 or the secondary coating layer 32 is colored, both coating layers have equilibrium elastic moduli of 60 MPa or less, and the secondary coating layer 32 has a relaxation modulus of 410 MPa or more, an optical fiber ribbon 4 that utilizes it, and an optical fiber cable 8.
    Type: Application
    Filed: December 30, 2013
    Publication date: August 14, 2014
    Applicant: Furukawa Electric Co., Ltd.
    Inventors: Hiroki TANAKA, Minoru KASAHARA, Kouji MOCHIDUKI, Minoru SAITO, Yasuo NAKAJIMA