Patents by Inventor Shigeru Nakagawa

Shigeru Nakagawa 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: 20170199343
    Abstract: An optical module includes: at least one optical waveguide provided on a surface of a substrate; a plurality of grooves provided in the optical waveguide on the surface of the substrate and having both a surface orthogonal to the surface of the substrate and an inclined surface; multiple pairs of light-emitting and light-receiving elements aligned with the plurality of grooves in the optical waveguide and provided so as to correspond to light of different wavelengths on the optical waveguide; and a plurality of light-selecting filters each provided on an inclined surface of the plurality of grooves in the optical waveguide and reflecting light of the wavelength corresponding to the light-emitting element in the respective pair of light-emitting and light-receiving elements towards the optical waveguide, and selectively reflecting light of the corresponding wavelength from the light propagating through the optical waveguide towards the corresponding pair of light-emitting and light-receiving elements.
    Type: Application
    Filed: March 28, 2017
    Publication date: July 13, 2017
    Inventors: SHIGERU NAKAGAWA, YOICHI TAIRA, MASAO TOKUNARI
  • Patent number: 9702316
    Abstract: A spark-ignition direct injection engine is provided. The engine includes an engine body, a fuel injection valve, a fuel pressure setting mechanism, an ignition plug, and a controller. The controller switches between a compression-ignition mode where the engine body is operated to perform compression-ignition combustion and a spark-ignition mode where the engine body is operated to perform spark-ignition combustion. Immediately after switching from the spark-ignition mode to the compression-ignition mode, the controller operates the engine body in a compression-ignition initial mode where the fuel pressure is set to be 30 MPa or above and the fuel injection valve is controlled to perform the fuel injection in a period from a late stage of the compression stroke to an early stage of the expansion stroke so that the gas mixture self-ignites to combust.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: July 11, 2017
    Assignee: Mazda Motor Corporation
    Inventors: Kouhei Iwai, Masahisa Yamakawa, Junichi Taga, Shigeru Nakagawa, Saori Mizuno, Keiji Araki
  • Publication number: 20170193200
    Abstract: A method and system are provided for predicting chemical structures. The method includes receiving, at a user interface, intended structural feature values and intended chemical property values, as vectors. The method further includes constructing, by a hardware processor, a prediction model, wherein the prediction model predicts other structural feature values from the intended structural feature values and the intended chemical property values, and automatically configuring, by the hardware processor, at least one chemical structure candidate from the other structural feature vectors.
    Type: Application
    Filed: December 30, 2015
    Publication date: July 6, 2017
    Inventors: Hsiang H. Hsu, Gakuto Kurata, Koji Masuda, Shigeru Nakagawa, Hajime Nakamura, Seiji Takeda
  • Patent number: 9523816
    Abstract: An optical device includes an SOI substrate, the embedded insulating layer having a thickness of 200 nanometers (nm) or less; an optical waveguide comprising a Group III-V compound semiconductor material formed on top of the SOI substrate; and an optical leakage preventing layer formed inside the SOI substrate on a bottom side of the optical waveguide to prevent leakage of light from inside the optical waveguide towards the SOI substrate.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: December 20, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Shigeru Nakagawa, Seiji Takeda
  • Patent number: 9484482
    Abstract: A light coupling structure is provided that includes a diffractive grating coupler, a total internal reflection (TIR) mirror, and a polymer waveguide. The TIR mirror is formed within the polymer waveguide to direct light signals between the diffractive grating coupler and the polymer waveguide.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: November 1, 2016
    Assignee: International Business Machines Corporation
    Inventors: Hsiang Han Hsu, Shigeru Nakagawa
  • Patent number: 9429711
    Abstract: An optical device includes a substrate including a waveguide array formed therein, each waveguide having a reflective surface; a lens array unit including a waveguide-side lens array arranged facing the waveguide array so each lens of the lens array is aligned with the corresponding reflective surface; and a connector unit including an optical transmission path-side lens array arranged and fixed so each lens of the lens array is aligned with the corresponding lens in the waveguide-side lens array, the plurality of inserted optical transmission paths aligned with the corresponding lens in the optical transmission path-side lens array.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: August 30, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Shigeru Nakagawa, Hidetoshi Numata, Yoichi Taira
  • Publication number: 20160246007
    Abstract: Embodiments of the present invention provide optical modules which input and output wavelength multiplexed optical signals to and from an optical waveguide, and a manufacturing method thereof. In one embodiment, an optical module comprises light emitting and light receiving element pairs that are positioned on grooves of one or more optical waveguides, where each light emitting and light receiving element pair corresponds to a different wavelength of light. Each light emitting and light receiving element pair includes an optical pin comprising an inclined surface and a light selecting filter that are configured to reflect light of a corresponding wavelength from an optical waveguide to the light receiving element, and from the light emitting element to the optical waveguide.
    Type: Application
    Filed: May 5, 2016
    Publication date: August 25, 2016
    Inventors: Shigeru Nakagawa, Yoichi Taira, Masao Tokunari
  • Publication number: 20160245128
    Abstract: A control system of an engine is provided. The control system includes an exhaust variable valve mechanism for changing an operation mode of an exhaust valve, a fuel injection controlling module for controlling a fuel injector to inject fuel at a fuel injection timing associated with an operating state of the engine, a variable valve mechanism controlling module for operating the exhaust valve via the exhaust variable valve mechanism in a first operation mode when the operating state of the engine is within a compression self-ignition range, and in a second operation mode when the operating state of the engine is within a spark-ignition range, and a first in-cylinder state quantity estimating module for estimating a first state quantity inside the cylinder relating to a burned gas amount within the cylinder.
    Type: Application
    Filed: January 27, 2016
    Publication date: August 25, 2016
    Inventors: Shuhei Shintani, Takuji Okumura, Hiroaki Horiuchi, Shigeru Nakagawa
  • Publication number: 20160209608
    Abstract: An optical module includes: at least one optical waveguide provided on a surface of a substrate; a plurality of grooves provided in the optical waveguide on the surface of the substrate and having both a surface orthogonal to the surface of the substrate and an inclined surface; multiple pairs of light-emitting and light-receiving elements aligned with the plurality of grooves in the optical waveguide and provided so as to correspond to light of different wavelengths on the optical waveguide; and a plurality of light-selecting filters each provided on an inclined surface of the plurality of grooves in the optical waveguide and reflecting light of the wavelength corresponding to the light-emitting element in the respective pair of light-emitting and light-receiving elements towards the optical waveguide, and selectively reflecting light of the corresponding wavelength from the light propagating through the optical waveguide towards the corresponding pair of light-emitting and light-receiving elements.
    Type: Application
    Filed: March 8, 2016
    Publication date: July 21, 2016
    Inventors: SHIGERU NAKAGAWA, YOICHI TAIRA, MASAO TOKUNARI
  • Patent number: 9389366
    Abstract: Embodiments of the present invention provide optical modules which input and output wavelength multiplexed optical signals to and from an optical waveguide, and a manufacturing method thereof. In one embodiment, an optical module comprises light emitting and light receiving element pairs that are positioned on grooves of one or more optical waveguides, where each light emitting and light receiving element pair corresponds to a different wavelength of light. Each light emitting and light receiving element pair includes an optical pin comprising an inclined surface and a light selecting filter that are configured to reflect light of a corresponding wavelength from an optical waveguide to the light receiving element, and from the light emitting element to the optical waveguide.
    Type: Grant
    Filed: October 21, 2014
    Date of Patent: July 12, 2016
    Assignee: International Business Machines Corporation
    Inventors: Shigeru Nakagawa, Yoichi Taira, Masao Tokunari
  • Publication number: 20160154188
    Abstract: Methods for fabricating connectors for multilayered optical waveguides, as well as apparatuses for multilayered optical waveguides that embody ferrules and connectors. The method of fabricating a connector includes the steps of: stacking in a containing unit of a ferrule, a plurality of optical waveguides that are each preliminarily formed in the shape of layers; and injecting resin or adhesive through a space lying between the plurality of optical waveguides and the containing unit of the ferrule, with the plurality of optical waveguides contained in a stacked manner so that resin or adhesive reaches each of the plurality of optical waveguides.
    Type: Application
    Filed: January 22, 2016
    Publication date: June 2, 2016
    Inventors: Shigeru Nakagawa, Hidetoshi Numata
  • Patent number: 9341797
    Abstract: An optical module includes: at least one optical waveguide provided on a surface of a substrate; a plurality of grooves provided in the optical waveguide on the surface of the substrate and having both a surface orthogonal to the surface of the substrate and an inclined surface; multiple pairs of light-emitting and light-receiving elements aligned with the plurality of grooves in the optical waveguide and provided so as to correspond to light of different wavelengths on the optical waveguide; and a plurality of light-selecting filters each provided on an inclined surface of the plurality of grooves in the optical waveguide and reflecting light of the wavelength corresponding to the light-emitting element in the respective pair of light-emitting and light-receiving elements towards the optical waveguide, and selectively reflecting light of the corresponding wavelength from the light propagating through the optical waveguide towards the corresponding pair of light-emitting and light-receiving elements.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: May 17, 2016
    Assignee: International Business Machines Corporation
    Inventors: Shigeru Nakagawa, Yoichi Taira, Masao Tokunari
  • Patent number: 9304255
    Abstract: An optical device includes an SOI substrate, the embedded insulating layer having a thickness of 200 nanometers (nm) or less; an optical waveguide comprising a Group III-V compound semiconductor material formed on top of the SOI substrate; and an optical leakage preventing layer formed inside the SOI substrate on a bottom side of the optical waveguide to prevent leakage of light from inside the optical waveguide towards the SOI substrate.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: April 5, 2016
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Shigeru Nakagawa, Seiji Takeda
  • Patent number: 9274288
    Abstract: Methods for fabricating connectors for multilayered optical waveguides, as well as apparatuses for multilayered optical waveguides that embody ferrules and connectors. The method of fabricating a connector includes the steps of: stacking in a containing unit of a ferrule, a plurality of optical waveguides that are each preliminarily formed in the shape of layers; and injecting resin or adhesive through a space lying between the plurality of optical waveguides and the containing unit of the ferrule, with the plurality of optical waveguides contained in a stacked manner so that resin or adhesive reaches each of the plurality of optical waveguides.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: March 1, 2016
    Assignee: International Business Machines Corporation
    Inventors: Shigeru Nakagawa, Hidetoshi Numata
  • Publication number: 20150378095
    Abstract: A light coupling structure is provided that includes a diffractive grating coupler, a total internal reflection (TIR) minor, and a polymer waveguide. The TIR minor is formed within the polymer waveguide to direct light signals between the diffractive grating coupler and the polymer waveguide.
    Type: Application
    Filed: June 24, 2015
    Publication date: December 31, 2015
    Inventors: Hsiang Han Hsu, Shigeru Nakagawa
  • Publication number: 20150316719
    Abstract: An optical device includes an SOI substrate, the embedded insulating layer having a thickness of 200 nanometers (nm) or less; an optical waveguide comprising a Group III-V compound semiconductor material formed on top of the SOI substrate; and an optical leakage preventing layer formed inside the SOI substrate on a bottom side of the optical waveguide to prevent leakage of light from inside the optical waveguide towards the SOI substrate.
    Type: Application
    Filed: June 24, 2015
    Publication date: November 5, 2015
    Inventors: Shigeru Nakagawa, Seiji Takeda
  • Publication number: 20150293305
    Abstract: An optical device includes a substrate including a waveguide array formed therein, each waveguide having a reflective surface; a lens array unit including a waveguide-side lens array arranged facing the waveguide array so each lens of the lens array is aligned with the corresponding reflective surface; and a connector unit including an optical transmission path-side lens array arranged and fixed so each lens of the lens array is aligned with the corresponding lens in the waveguide-side lens array, the plurality of inserted optical transmission paths aligned with the corresponding lens in the optical transmission path-side lens array.
    Type: Application
    Filed: June 24, 2015
    Publication date: October 15, 2015
    Inventors: Shigeru Nakagawa, Hidetoshi Numata, Yoichi Taira
  • Publication number: 20150277041
    Abstract: An optical device includes an SOI substrate, the embedded insulating layer having a thickness of 200 nanometers (nm) or less; an optical waveguide comprising a Group III-V compound semiconductor material formed on top of the SOI substrate; and an optical leakage preventing layer formed inside the SOI substrate on a bottom side of the optical waveguide to prevent leakage of light from inside the optical waveguide towards the SOI substrate.
    Type: Application
    Filed: March 10, 2015
    Publication date: October 1, 2015
    Inventors: Shigeru Nakagawa, Seiji Takeda
  • Publication number: 20150277066
    Abstract: An optical device includes a substrate including a waveguide array formed therein, each waveguide having a reflective surface; a lens array unit including a waveguide-side lens array arranged facing the waveguide array so each lens of the lens array is aligned with the corresponding reflective surface; and a connector unit including an optical transmission path-side lens array arranged and fixed so each lens of the lens array is aligned with the corresponding lens in the waveguide-side lens array, the plurality of inserted optical transmission paths aligned with the corresponding lens in the optical transmission path-side lens array.
    Type: Application
    Filed: March 13, 2015
    Publication date: October 1, 2015
    Inventors: Shigeru Nakagawa, Hidetoshi Numata, Yoichi Taira
  • Publication number: 20150153522
    Abstract: Embodiments of the present invention provide optical modules which input and output wavelength multiplexed optical signals to and from an optical waveguide, and a manufacturing method thereof. In one embodiment, an optical module comprises light emitting and light receiving element pairs that are positioned on grooves of one or more optical waveguides, where each light emitting and light receiving element pair corresponds to a different wavelength of light. Each light emitting and light receiving element pair includes an optical pin comprising an inclined surface and a light selecting filter that are configured to reflect light of a corresponding wavelength from an optical waveguide to the light receiving element, and from the light emitting element to the optical waveguide.
    Type: Application
    Filed: October 21, 2014
    Publication date: June 4, 2015
    Inventors: Shigeru Nakagawa, Yoichi Taira, Masao Tokunari