Patents by Inventor Yoshiki Yamakawa

Yoshiki Yamakawa 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).

  • Optical fiber core wire
    Patent number: 11385431
    Abstract: The coated optical fiber (10) includes: an optical fiber (11) including a core (111) and a cladding (112); a first buffer layer (121) covering the optical fiber (11), and having a refractive index lower than that of the cladding (112) and a Shore D hardness of D/20.0/1 or higher; a second buffer layer (122) covering the first buffer layer (121), and having a higher Shore D hardness than the first buffer layer (121); and a jacket (13) covering the second buffer layer (122).
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: July 12, 2022
    Assignee: Mitshishi Cable Industries, Ltd.
    Inventors: Masatoshi Tanaka, Yoshiki Yamakawa, Hideaki Itou, Daiki Tabei
  • OPTICAL FIBER CORE WIRE
    Publication number: 20190346649
    Abstract: The coated optical fiber (10) includes: an optical fiber (11) including a core (111) and a cladding (112); a first buffer layer (121) covering the optical fiber (11), and having a refractive index lower than that of the cladding (112) and a Shore D hardness of D/20.0/1 or higher; a second buffer layer (122) covering the first buffer layer (121), and having a higher Shore D hardness than the first buffer layer (121); and a jacket (13) covering the second buffer layer (122).
    Type: Application
    Filed: December 12, 2017
    Publication date: November 14, 2019
    Inventors: Masatoshi TANAKA, Yoshiki YAMAKAWA, Hideaki ITOU, Daiki TABEI
  • Optical temperature sensor and method for manufacturing optical temperature sensor
    Patent number: 10139290
    Abstract: Provided is an optical temperature sensor including a temperature sensing element having light transmission characteristics that vary with temperature, a hollow holding member that holds the temperature sensing element, and an optical fiber that is arranged inside the holding member, the optical fiber including a tip face that is disposed to face the temperature sensing element at a position separated from the temperature sensing element by a predetermined distance. The temperature sensing element allows light emitted from the tip face of the optical fiber to be incident thereon, allows the incident light to be transmitted therethrough, and allows reflected light of the transmitted light that has been reflected by a measuring object to be transmitted therethrough.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: November 27, 2018
    Assignee: Tokyo Electron Limited
    Inventors: Takari Yamamoto, Kenichiro Yamada, Yoshiki Yamakawa, Yuji Mizuma, Hirokazu Taniguchi, Masatoshi Tabira
  • OPTICAL TEMPERATURE SENSOR AND METHOD FOR MANUFACTURING OPTICAL TEMPERATURE SENSOR
    Publication number: 20160363486
    Abstract: Provided is an optical temperature sensor including a temperature sensing element having light transmission characteristics that vary with temperature, a hollow holding member that holds the temperature sensing element, and an optical fiber that is arranged inside the holding member, the optical fiber including a tip face that is disposed to face the temperature sensing element at a position separated from the temperature sensing element by a predetermined distance. The temperature sensing element allows light emitted from the tip face of the optical fiber to be incident thereon, allows the incident light to be transmitted therethrough, and allows reflected light of the transmitted light that has been reflected by a measuring object to be transmitted therethrough.
    Type: Application
    Filed: March 2, 2015
    Publication date: December 15, 2016
    Inventors: Takari YAMAMOTO, Kenichiro YAMADA, Yoshiki YAMAKAWA, Yuji MIZUMA, Hirokazu TANIGUCHI, Masatoshi TABIRA
  • Optical fiber/glass tube fusion-spliced structure, optical fiber assembly including the structure, and glass tube used in the structure
    Patent number: 7507038
    Abstract: An optical fiber/glass tube fusion spliced structure includes an optical fiber made of glass and a glass tube through which the optical fiber is inserted and at least in part of the optical fiber/glass tube fusion spliced structure, an outer circumference portion of the optical fiber and an inner circumference portion of the glass tube are fusion spliced. Part of the fusion spliced portion located in one of the optical fiber and the glass tube is formed of a material having a lower fusion point than a fusion point of part of the fusion spliced portion located in the other.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: March 24, 2009
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Mamoru Nakamura, Takeshi Satake, Motohiko Yamasaki, Moriyuki Fujita, Kenji Sato, Yoshiki Yamakawa
  • Optical fiber/glass tube fusion-spliced structure, optical fiber assembly including the structure and glass tube used in the structure
    Publication number: 20080247714
    Abstract: An optical fiber/glass tube fusion spliced structure includes an optical fiber made of glass and a glass tube through which the optical fiber is inserted and at least in part of the optical fiber/glass tube fusion spliced structure, an outer circumference portion of the optical fiber and an inner circumference portion of the glass tube are fusion spliced. Part of the fusion spliced portion located in one of the optical fiber and the glass tube is formed of a material having a lower fusion point than a fusion point of part of the fusion spliced portion located in the other.
    Type: Application
    Filed: April 3, 2007
    Publication date: October 9, 2008
    Inventors: Mamoru Nakamura, Takeshi Satake, Motohiko Yamasaki, Moriyuki Fujita, Kenji Sato, Yoshiki Yamakawa