Patents by Inventor Iwao Okazaki

Iwao Okazaki 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: 20200369554
    Abstract: An optical fiber manufacturing method includes a process of passing a glass fiber through a fiber path before applying a resin. The glass fiber is drawn from a glass preform, the fiber path is formed through a cooling tube, and the cooling tube is housed in a casing and is cooled by a coolant. The process includes supplying a dry gas into a dry space formed between the casing and the cooling tube. The dry gas has a first dew point lower than the temperature of the cooling tube. The process includes measuring, by a dew point meter, a second dew point at one or both of an inlet and an outlet of the fiber path. The process includes controlling the temperature of the coolant in the cooling tube such that the temperature of the cooling tube is higher than the second dew point measured by the dew point meter.
    Type: Application
    Filed: May 14, 2020
    Publication date: November 26, 2020
    Inventors: Takahiro SAITO, Iwao OKAZAKI
  • Publication number: 20200369556
    Abstract: An optical fiber manufacturing method includes a first process of passing a glass fiber through a fiber path. The fiber path is formed through a cooling tube that is housed in a first casing. The method also includes a second process of leading the glass fiber into a second casing before leading into the first casing. The first process includes supplying a first dry gas, having a dew point lower than the temperature of the cooling tube, into a first dry space formed between the first casing and the cooling tube. The second process includes supplying a second dry gas into a second dry space formed inside the second casing so as to cause air pressure in the second dry space to be higher than air pressure in an external space. The dew point of the second dry gas is lower than the dew point in the external space.
    Type: Application
    Filed: May 18, 2020
    Publication date: November 26, 2020
    Inventors: Takahiro SAITO, Iwao OKAZAKI, Yoshihiro MORIMOTO, Makoto AOKI
  • Publication number: 20200199009
    Abstract: In a method for manufacturing an optical fiber, a dummy rod is connected to a vicinity of an upper end of a glass preform which includes a diameter-reduced portion at an upper portion thereof, and the glass preform is heated to be melt in a drawing furnace to draw an optical fiber. A cap member is provided at a position of the diameter-reduced portion, and an upper end of the cap member is disposed close to a lower end of the dummy rod. When an orthogonal coordinate axis is set, in which an outer diameter ratio of the cap member to the glass preform is set as a horizontal axis x, and an outer diameter ratio of the dummy rod to the glass preform is set as a vertical axis y, the x and the y satisfy an expression y?0.1527×x?3.103.
    Type: Application
    Filed: November 2, 2016
    Publication date: June 25, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tatsuya KONISHI, Iwao OKAZAKI, Fumio YOSHIMURA
  • Patent number: 10487001
    Abstract: A seal structure of an optical fiber drawing furnace for sealing a gap between an upper end opening of the optical fiber drawing furnace and an optical fiber glass preform inserted from the upper end opening, includes a plurality of blade members, a support mechanism for supporting the plurality of blade members, and a pressing operation mechanism for individually pressing the plurality of blade members in a radial direction of the optical fiber glass preform so as to bring distal ends of the plurality of blade members into contact with a side surface of the optical fiber glass preform, wherein a pressing force at the time of bringing the plurality of blade members into contact with the optical fiber glass preform is set at 0.1 to 10 N per blade member.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: November 26, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takashi Yamazaki, Iwao Okazaki, Tatsuya Konishi
  • Publication number: 20190210910
    Abstract: An optical fiber drawing method where a glass base material passes through an opening provided in a drawing furnace from the material side and drawing is performed by suspending and descending the material into the drawing furnace while being sealed by a sealing mechanism provided in the vicinity of the opening, in which a first portion of the sealing mechanism seals a gap between an outer peripheral surface of the material and an inner surface of the opening when drawing starts and a tapered portion of the material starts passing through the first portion, and a second portion is disposed above the first portion before sealing by the first portion becomes ineffective, and then conduction between inside and outside of the drawing furnace is carried out to prevent fluctuation of pressure inside the furnace immediately after disposing the second portion and the conduction is interrupted when the material further descends.
    Type: Application
    Filed: September 4, 2017
    Publication date: July 11, 2019
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Satoshi YOSHIKAWA, Iwao OKAZAKI, Takashi YAMAZAKI
  • Patent number: 9567252
    Abstract: Capacity of space in a drawing furnace is decreased so as to reduce variations in pressure in the furnace and also the side of an insertion port of a glass perform is stably sealed. When drawing is started, an outer peripheral surface of the optical fiber glass preform 11 is sealed with a first seal part 17 of the seal mechanism. After a vicinity of a taper part of the optical fiber glass preform 11 starts to pass through the first seal part 17, switching to a second seal part 18 arranged above the first seal part 17 is performed, and an outer peripheral surface of a sleeve member 20 fixed so as to surround an outer periphery of the dummy rod 12 is sealed with the second seal part 18.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: February 14, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Iwao Okazaki, Takashi Yamazaki, Tatsuya Konishi, Katsuyuki Tsuneishi
  • Patent number: 9475722
    Abstract: An apparatus includes a susceptor and a protective pipe. A gas containing 50% or more of argon or nitrogen is used as a gas to be supplied into the susceptor. The protective pipe has a heat insulating region (17a) enclosed with a heat insulator (18) with a length of Db (mm) at the upper section thereof and a non-heat insulating region (17b) not enclosed with any heat insulators at the lower section thereof. The temperature of the glass fiber at the outlet of the protective pipe becomes 1700° C. or less. The outer diameter of the glass fiber at the outlet of the protective pipe is within a range of the target outer diameter of the glass fiber+6 ?m or less.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: October 25, 2016
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tadashi Enomoto, Iwao Okazaki, Takashi Yamazaki, Masatoshi Hayakawa, Manabu Shiozaki, Norihiro Uenoyama, Masaru Furusyou
  • Publication number: 20160002090
    Abstract: Capacity of space in a drawing furnace is decreased so as to reduce variations in pressure in the furnace and also the side of an insertion port of a glass perform is stably sealed. When drawing is started, an outer peripheral surface of the optical fiber glass preform 11 is sealed with a first seal part 17 of the seal mechanism. After a vicinity of a taper part of the optical fiber glass preform 11 starts to pass through the first seal part 17, switching to a second seal part 18 arranged above the first seal part 17 is performed, and an outer peripheral surface of a sleeve member 20 fixed so as to surround an outer periphery of the dummy rod 12 is sealed with the second seal part 18.
    Type: Application
    Filed: February 18, 2014
    Publication date: January 7, 2016
    Inventors: Iwao OKAZAKI, Takashi YAMAZAKI, Tatsuya KONISHI, Katsuyuki TSUNEISHI
  • Publication number: 20150321944
    Abstract: A seal structure of an optical fiber drawing furnace for sealing a gap between an upper end opening of the optical fiber drawing furnace and an optical fiber glass preform inserted from the upper end opening, includes a plurality of blade members, a support mechanism for supporting the plurality of blade members, and a pressing operation mechanism for individually pressing the plurality of blade members in a radial direction of the optical fiber glass preform so as to bring distal ends of the plurality of blade members into contact with a side surface of the optical fiber glass preform, wherein a pressing force at the time of bringing the plurality of blade members into contact with the optical fiber glass preform is set at 0.1 to 10 N per blade member.
    Type: Application
    Filed: January 24, 2014
    Publication date: November 12, 2015
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takashi YAMAZAKI, Iwao OKAZAKI, Tatsuya KONISHI
  • Patent number: 9120694
    Abstract: The present invention provides a glass preform heating furnace in which the occurrence of arching is suppressed. The glass preform heating furnace is equipped with a susceptor (3); a slit heater (4); an insulator; and a furnace body, wherein, in the case that the space between the slit heater (4) and the susceptor or between the slit heater (4) and the conductive member closest to the slit heater is D, that the maximum value of the electric field in this space is E1, that the number of the slits in the slit heater is N, that the slit width of the slit heater is S, and that the maximum value of the electric field in the slit space is E2, the values of D, N and S are set so that E1?E2 is established.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: September 1, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tadashi Enomoto, Iwao Okazaki, Takashi Yamazaki, Masatoshi Hayakawa
  • Publication number: 20150101368
    Abstract: When a lower gauge pressure of a cooling tube part is set at A, and the number of divided units of the cooling tube part is set at N, and a length of each of the divided units of the cooling tube part is set at Li (i=1 to N), and a radius of each of the divided units of the cooling tube part is set at Ri (i=1 to N), and a gas flow rate of a coolant gas passed through each of the divided units of the cooling tube part is set at Qi (i=1 to N), and a viscosity coefficient of a coolant gas is set at ?1, and a radius of an optical fiber is set at r1, and a drawing speed of the optical fiber is set at V1, and a pressure loss of a straight tube part is set at B, and the number of divided units of the straight tube part is set at n, and a length of each of the divided units of the straight tube part is set at LLj (j=1 to n), and a radius of each of the divided units of the straight tube part is set at RRj (j=1 to n), and a gas flow rate of a pressurized gas passed through the straight tube part is set at Qgas, and a
    Type: Application
    Filed: October 9, 2014
    Publication date: April 16, 2015
    Inventors: Norihiro UENOYAMA, Iwao OKAZAKI, Manabu SHIOZAKI, Tadashi ENOMOTO
  • Publication number: 20140226948
    Abstract: An apparatus includes a susceptor and a protective pipe. A gas containing 50% or more of argon or nitrogen is used as a gas to be supplied into the susceptor. The protective pipe has a heat insulating region (17a) enclosed with a heat insulator (18) with a length of Db (mm) at the upper section thereof and a non-heat insulating region (17b) not enclosed with any heat insulators at the lower section thereof. The temperature of the glass fiber at the outlet of the protective pipe becomes 1700° C. or less. The outer diameter of the glass fiber at the outlet of the protective pipe is within a range of the target outer diameter of the glass fiber+6 ?m or less.
    Type: Application
    Filed: January 9, 2013
    Publication date: August 14, 2014
    Inventors: Tadashi Enomoto, Iwao Okazaki, Takashi Yamazaki, Masatoshi Hayakawa, Manabu Shiozaki, Norihiro Uenoyama, Masaru Furusyou
  • Publication number: 20140196505
    Abstract: The present invention provides a glass preform heating furnace in which the occurrence of arching is suppressed. The glass preform heating furnace is equipped with a susceptor (3); a slit heater (4); an insulator; and a furnace body, wherein, in the case that the space between the slit heater (4) and the susceptor or between the slit heater (4) and the conductive member closest to the slit heater is D, that the maximum value of the electric field in this space is E1, that the number of the slits in the slit heater is N, that the slit width of the slit heater is S, and that the maximum value of the electric field in the slit space is E2, the values of D, N and S are set so that E1?E2 is established.
    Type: Application
    Filed: June 13, 2012
    Publication date: July 17, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tadashi Enomoto, Iwao Okazaki, Takashi Yamazaki, Masatoshi Hayakawa
  • Patent number: 7016582
    Abstract: Based on an intermediate 20A in which a cladding portion 22 is formed on the outer periphery of a core portion 21, a pair of holes 23 and 24 are provided parallel to the z axis on both sides of the core portion 21 within the cladding portion 22, and an intermediate 20 is thereby fabricated. In this intermediate 20, a width Ry in the y-axis direction is made smaller than a width Rx in the x-axis direction. Moreover, a cylindrical stress applying part 33 is inserted into a hole 23 of the intermediate 20, and a cylindrical stress applying part 34 is inserted into a hole 24 thereof. Thus, a preform 40 is formed. These materials are drawn and integrated together, and a polarization maintaining optical fiber is thereby manufactured.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: March 21, 2006
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Iwao Okazaki, Ichiro Tsuchiya, Shinji Ishikawa, Motohide Yoshida, Tetsuya Haruna, Kazuyuki Soma
  • Publication number: 20040114895
    Abstract: Based on an intermediate 20A in which a cladding portion 22 is formed on the outer periphery of a core portion 21, a pair of holes 23 and 24 are provided parallel to the z axis on both sides of the core portion 21 within the cladding portion 22, and an intermediate 20 is thereby fabricated. In this intermediate 20, a width Ry in the y-axis direction is made smaller than a width Rx in the x-axis direction. Moreover, a cylindrical stress applying part 33 is inserted into a hole 23 of the intermediate 20, and a cylindrical stress applying part 34 is inserted into a hole 24 thereof. Thus, a preform 40 is formed. These materials are drawn and integrated together, and a polarization maintaining optical fiber is thereby manufactured.
    Type: Application
    Filed: September 30, 2003
    Publication date: June 17, 2004
    Inventors: Iwao Okazaki, Ichiro Tsuchiya, Shinji Ishikawa, Motohide Yoshida, Tetsuya Haruna, Kazuyuki Soma
  • Publication number: 20020018883
    Abstract: A thermoplastic resin film includes at least a thermoplastic resin A having a glass transition temperature of equal to or higher than 150° C., and this film has a thickness equal to or more than 30 &mgr;m, a retardation less than or equal to 20 nm, an enthalpy relaxation temperature from 140° C. to 200° C. and an enthalpy relaxation magnitude from 0.01 to 2.0 kJ/mol. This film has good surface flatness, low retardation and satisfactory thermal dimensional stability, and can be advantageously used as a substrate of liquid crystal display device.
    Type: Application
    Filed: June 25, 2001
    Publication date: February 14, 2002
    Inventors: Iwao Okazaki, Kenji Tsunashima, Yutaka Harada
  • Patent number: 6331344
    Abstract: According to the present invention, a biaxially oriented polyester film is provided which comprises at least one film layer composed predominantly of polypropylene terephthalate and has a heat shrinkage of 0.8% or below after standing at 80° C. for 30 minutes. This film is excellent in wear resistance and hence useful particularly for magnetic recording media.
    Type: Grant
    Filed: August 16, 1999
    Date of Patent: December 18, 2001
    Assignee: Toray Industries, Inc.
    Inventors: Iwao Okazaki, Yukari Nakamori, Shozi Nakajima, Akira Kubota, Yuri Shirakawa
  • Patent number: 6319587
    Abstract: A biaxially-oriented polyester film includes at least two layers and at least one outermost layer is composed of a polyester having a rigid amorphous content of about 10 to 55%. The biaxially-oriented polyester film has a longitudinal Young's modulus of at least about 4.5 GPa. The biaxially-oriented polyester film is suitable for high-density magnetic recording media, such as digital video tapes and high-density data recording tapes.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: November 20, 2001
    Assignee: Toray Industries, Inc.
    Inventors: Iwao Okazaki, Shozi Nakajima, Yukari Nakamori
  • Patent number: 5677034
    Abstract: Disclosed is a biaxially oriented, laminated polyester film having a lamination structure with at least two layers. At least one of the outermost layers of the film is a thin laminated layer A having a thickness of not more than 3 .mu.m. In the layer A, internally formed particles and specified agglomerated particles or mono-dispersed particles are present, or the mono-dispersed particles are present at a very small content. When the polyester film is used as a base film for magnetic recording media, the abrasion resistance of the film surface at a high speed can be greatly increased.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: October 14, 1997
    Assignee: Toray Industries, Inc.
    Inventors: Iwao Okazaki, Tohru Miyake, Koichi Abe, Keisuke Ohshima
  • Patent number: 5532047
    Abstract: Disclosed is a biaxially oriented, laminated polyester film having a lamination structure with at least two layers. At least one of the outermost layers of the film is a thin laminated layer A having a thickness of not more than 3 .mu.m. In the layer A, internally formed particles and specified agglomerated particles or mono-dispersed particles are present, or the mono-dispersed particles are present at a very small content. When the polyester film is used as a base film for magnetic recording media, the abrasion resistance of the film surface at a high speed can be greatly increased.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: July 2, 1996
    Assignee: Toray Industries, Inc.
    Inventors: Iwao Okazaki, Tohru Miyake, Koichi Abe, Keisuke Ohshima