Patents by Inventor Yasuhiro Koike

Yasuhiro Koike 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: 20250147213
    Abstract: A translucent resin composition comprises a transparent resin, and a natural fiber having a birefringence ?n of 0.013 to 0.15 and an average particle size of 2 to 100 ?m. The translucent resin composition contains 1 to 20 parts by mass of natural fiber with respect to 100 parts by mass of transparent resin. The translucent resin composition is used for depolarization. The natural fiber is an animal fiber.
    Type: Application
    Filed: January 13, 2025
    Publication date: May 8, 2025
    Applicants: SAIDEN CHEMICAL INDUSTRY CO., LTD.
    Inventors: Sumihisa ODA, Yasuhiro Koike, Shizuki Sasaki
  • Patent number: 12242103
    Abstract: A batch-molding multi optical transmission sheet assembly includes a batch-molding multi optical transmission sheet, a housing member, and a fixing element. The batch-molding multi optical transmission sheet includes a sheet-like covering part made of plastic, and a plurality of optical transmission regions, inside the covering part, including a core region made of plastic that is disposed to extend along an extending direction of the covering part and a clad region made of plastic that surrounds an outer circumference of the core region, the optical transmission regions being arranged in a line in substantially parallel with each other along a principal surface of the covering part. The housing member includes a disposition hole in which at least one end part of the batch-molding multi optical transmission sheet is housed. The fixing element fixes the batch-molding multi optical transmission sheet and the housing member.
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: March 4, 2025
    Inventors: Yasuhiro Koike, Hiroshi Takizuka
  • Patent number: 11828977
    Abstract: An integrally molded multi-optical transmission sheet includes: a sheet-like coated portion formed of plastic; and a plurality of optical transmission regions having a core region formed of plastic, and a clad region formed of plastic and surrounding an outer periphery of the core region, which are provided inside the coated portion to extend along an extending direction of the coated portion, wherein the plurality of optical transmission regions are arranged in a row substantially parallel to each other along a main surface of the coated portion, and in a case where light is incident from one end face side of the plurality of optical transmission regions and transmitted toward the other end face side, a M2 value of emitted light is 1.7 or more.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: November 28, 2023
    Inventor: Yasuhiro Koike
  • Patent number: 11726247
    Abstract: There is provided a display device exhibiting a good color reproducibility, even when observed through polarized sunglasses. A display device comprises a polarizer a and an optical film X on a surface on a light emitting surface side of a display element, wherein L1, which is the light incident vertically on the optical film X, among light incident on the optical film X from the display element side, satisfies a specific condition, and L2, which is the light emitting vertically from the light emitting surface side of the optical film X, and passing through a polarizer b having the absorption axis parallel to the absorption axis of the polarizer a, satisfies a specific condition.
    Type: Grant
    Filed: September 17, 2020
    Date of Patent: August 15, 2023
    Assignees: DAI NIPPON PRINTING CO., LTD.
    Inventors: Takashi Kuroda, Yasuhiro Koike
  • Patent number: 11411648
    Abstract: An optical transmission system transmits a Radio Frequency (RF) signal by a frequency division multiplexing method. The optical transmission system includes a Transmitter Optical SubAssembly (TOSA), an optical fiber, and a Receiver Optical SubAssembly (ROSA). The TOSA includes a surface emitting laser diode configured to be capable of emitting light at output of 0.8 mW or more. In the optical transmission system including the surface emitting laser diode, a noise index obtained by a measurement method including a predetermined step is 10.0 dB?V or less.
    Type: Grant
    Filed: November 28, 2019
    Date of Patent: August 9, 2022
    Assignees: NITTO DENKO CORPORATION
    Inventors: Yuichi Tsujita, Takeshi Tanaka, Satoshi Ito, Keita Kiyoshima, Atsushi Yamagishi, Yasuhiro Koike, Azusa Inoue
  • Patent number: 11204524
    Abstract: The present invention aims to provide an image display device including an optical film having a thickness suitable for practical use without including any special inorganic material, wherein the image display device has high color rendering properties and is capable of minimizing the occurrence of blackout and interference colors (rainbow unevenness) even when the image display device includes light sources that emit light having a narrow emission spectrum. The present invention provides an image display device including an optical film having an in-plane birefringence and a polarizer in this order, wherein the optical film and the polarizer are disposed to form an angle of about 45° between a slow axis of the optical film and an absorption axis of the polarizer, the optical film has a retardation of 3000 nm or more, and light incident on the optical film provides at least 50% coverage of ITU-R BT.2020.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: December 21, 2021
    Assignees: Dai Nippon Printing Co., Ltd.
    Inventors: Yasuhiro Koike, Takashi Kuroda, Kana Yamamoto
  • Patent number: 11092738
    Abstract: Provided is an optical fiber cable which allows for high-quality signal transmission in short-distance transmission. The optical fiber cable is designed for use in optical communication based on transmitting an optical beam from a light-emitting device, to a light-receiving device. The optical fiber cable has: a proximal end which is one end thereof on the side of the light-emitting device, and a distal end which is the other end thereof on the side of the light-receiving device, wherein an optical beam returning from the side of the distal end toward the side of the light-emitting device has an M2 factor of 1.7 or more; and a length of 50 m or less.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: August 17, 2021
    Assignees: NITTO DENKO CORPORATION
    Inventors: Yasuhiro Koike, Azusa Inoue
  • Patent number: 10948764
    Abstract: The present invention provides a liquid crystal display method capable of, when a screen thereof is observed through a polarizer such as sunglasses, ensuring an excellent visibility regardless of the angle of observation. In a liquid crystal display device at least having a backlight light source, a liquid crystal cell, and a polarizer disposed on a viewing side of the liquid crystal cell, a white light-emitting diode is used as the backlight light source; and a polymer film having a retardation of from 3,000 nm to 30,000 nm is used so as to be disposed on the viewing side of the polarizer so that an angle between an absorption axis of the polarizer and a slow axis of the polymer film becomes about 45 degrees.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: March 16, 2021
    Assignees: KEIO UNIVERSITY, TOYOBO CO., LTD.
    Inventors: Yasuhiro Koike, Akihiro Tagaya
  • Patent number: 10890704
    Abstract: There is provided a display device exhibiting a good color reproducibility, even when observed through polarized sunglasses. A display device comprises a polarizer a and an optical film X on a surface on a light emitting surface side of a display element, wherein L1, which is the light incident vertically on the optical film X, among light incident on the optical film X from the display element side, satisfies a specific condition, and L2, which is the light emitting vertically from the light emitting surface side of the optical film X, and passing through a polarizer b having the absorption axis parallel to the absorption axis of the polarizer a, satisfies a specific condition.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: January 12, 2021
    Assignees: DAI NIPPON PRINTING CO., LTD.
    Inventors: Takashi Kuroda, Yasuhiro Koike
  • Publication number: 20200264365
    Abstract: Provided is an optical fiber cable which allows for high-quality signal transmission in short-distance transmission. The optical fiber cable is designed for use in optical communication based on transmitting an optical beam from a light-emitting device, to a light-receiving device. The optical fiber cable has: a proximal end which is one end thereof on the side of the light-emitting device, and a distal end which is the other end thereof on the side of the light-receiving device, wherein an optical beam returning from the side of the distal end toward the side of the light-emitting device has an M2 factor of 1.7 or more; and a length of 50 m or less.
    Type: Application
    Filed: September 11, 2018
    Publication date: August 20, 2020
    Applicants: NITTO DENKO CORPORATION
    Inventors: Yasuhiro Koike, Azusa Inoue
  • Patent number: 10677975
    Abstract: There is provided a display device exhibiting a good color reproducibility, even when observed through polarized sunglasses. A display device comprises a display element, and a polarizer a and an optical film X on a surface on a light emitting surface side of the display element, wherein L1, which is the light incident vertically on the optical film X, among light incident on the optical film X from the display element side, satisfies a specific condition, and L2, which is the light emitting vertically from the light emitting surface side of the optical film X, and passing through a polarizer b having the absorption axis parallel to the absorption axis of the polarizer a, satisfies a specific condition.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: June 9, 2020
    Assignees: DAI NIPPON PRINTING CO., LTD.
    Inventors: Takashi Kuroda, Yasuhiro Koike
  • Patent number: 10054816
    Abstract: The present invention provides a liquid crystal display method capable of, when a screen thereof is observed through a polarizer such as sunglasses, ensuring an excellent visibility regardless of the angle of observation. In a liquid crystal display device at least having a backlight light source, a liquid crystal cell, and a polarizer disposed on a viewing side of the liquid crystal cell, a white light-emitting diode is used as the backlight light source; and a polymer film having a retardation of from 3,000 nm to 30,000 nm is used so as to be disposed on the viewing side of the polarizer so that an angle between an absorption axis of the polarizer and a slow axis of the polymer film becomes about 45 degrees.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: August 21, 2018
    Assignees: TOYO BOSEKI KABUSHIKI KAISHA, KEIO UNIVERSITY
    Inventors: Yasuhiro Koike, Akihiro Tagaya
  • Patent number: 10035889
    Abstract: Disclosed is an optical film having low wavelength dispersibility which is obtained by stretching a film formed of a fluorine-containing cyclic olefin polymer including at least one selected from a repeating structural unit represented by the formula described below, wherein a phase difference at a wavelength of 550 nm is greater than or equal to 50 nm, wavelength dispersibility represented by a ratio Re (400 nm)/Re (550 nm) of a phase difference Re (400 nm) at a wavelength of 400 nm to a phase difference Re (550 nm) at a wavelength of 550 nm is 1.00 to 1.05, wavelength dispersibility represented by a ratio Re (400 nm)/Re (800 nm) of a phase difference Re (400 nm) at a wavelength of 400 nm to a phase difference Re (800 nm) at a wavelength of 800 nm is 1.00 to 1.05, and total light transmittance is greater than or equal to 92%.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: July 31, 2018
    Assignees: MITSUI CHEMICALS, INC., KEIO UNIVERSITY
    Inventors: Tadahiro Sunaga, Takashi Oda, Yasuhiro Koike
  • Patent number: 10022677
    Abstract: Disclosed herein is a process for separating components of a gas mixture using gas-separation copolymer membranes. These membranes use a selective layer made from copolymers of perfluorodioxolane monomers. The resulting membranes have superior selectivity performance for gas pairs of interest while maintaining fast gas permeance compared to membranes prepared using conventional perfluoropolymers, such as Teflon® AF, Hyflon® AD, and Cytop®.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: July 17, 2018
    Assignee: Membrane Technology and Research, Inc.
    Inventors: Zhenjie He, Timothy C. Merkel, Yoshiyuki Okamoto, Yasuhiro Koike
  • Publication number: 20170368498
    Abstract: A process for separating components of a fluid mixture using membranes comprising a selective layer made from copolymers of perfluorinated dioxolanes. The resulting membranes have superior selectivity performance for fluid pairs of interest while maintaining fast fluid permeance compared to membranes prepared using conventional perfluoropolymers, such as Teflon® AF, Hyfion® AD, and Cytop®.
    Type: Application
    Filed: September 6, 2017
    Publication date: December 28, 2017
    Applicant: Membrane Technology and Research, Inc.
    Inventors: Zhenjie He, Timothy C. Merkel, Johannes G. Wijmans, Yoshiyuki Okamoto, Yasuhiro Koike
  • Patent number: 9798068
    Abstract: Provided is an illumination module capable of preventing a light exit surface from being darker along peripheral edge portions as though having borders. An illumination module (1) includes: a light guiding plate (20), which has an end surface (21) and a first principal surface (23); a light source (30) configured to emit light that enters the end surface (21); and a diffusion plate (50), which has alight incident surface (55) and a light exit surface (56). The diffusion plate (50) includes a protruding part (51), which protrudes toward the light guiding plate (20) side and the light source (30), which is positioned so as to face a peripheral edge portion (26) on the end surface (21) side of the light guiding plate (20), and which has a light incident surface (52) into which light exiting the peripheral edge portion (26) enters.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: October 24, 2017
    Assignees: KEIO UNIVERSITY, NITTOH INC.
    Inventors: Yasuhiro Koike, Akihiro Tagaya, Keiichi Mochizuki, Takashi Iwamoto, Kazumasa Osumi
  • Patent number: 9693456
    Abstract: This substrate includes an insulating substrate having a first surface and a second surface, and a metal layer of a metal plate bonded to the first surface. The insulating substrate has a through hole. The metal layer includes: a bent section that is inserted through the through hole and bulges from the first surface toward the second surface; and outer periphery sections that are positioned around the bent section and are bonded to the first surface. The bent section has a first end and a second end positioned on opposite sides, and is bent with respect to the outer periphery sections at the first end and the second ends. The outer periphery sections are divided into a first outer periphery section and a second outer periphery section, which are respectively continuous with the first end and the second end of the bent section.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: June 27, 2017
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Kiminori Ozaki, Yasuhiro Koike, Hiroaki Asano, Hitoshi Shimadu, Shigeki Kawaguchi, Tomoaki Asai
  • Patent number: 9655240
    Abstract: A substrate includes an insulating substrate, a metal layer formed on one surface of the insulating substrate, and an electronic component soldered to the surface of the metal layer. The metal layer is formed of a metal plate. The surface of the metal layer has a soldering area, and a groove portion positioned on the outer periphery of the soldering area.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: May 16, 2017
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Kiminori Ozaki, Yasuhiro Koike, Hiroaki Asano, Hitoshi Shimadu, Shigeki Kawaguchi, Tomoaki Asai
  • Patent number: 9643124
    Abstract: A process for separating components of a gas mixture using gas-separation copolymer membranes. These membranes use a selective layer made from copolymers of partially fluorinated or perfluorinated dioxolane monomers and a second monomer, such as dioxane or a partially fluorinated dioxolane. The resulting membranes have superior selectivity performance for gas pairs of interest while maintaining fast gas permeance compared to membranes prepared using conventional perfluoropolymers, such as Teflon® AF, Hyflon® AD, and Cytop®.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: May 9, 2017
    Assignee: Membrane Technology and Research, Inc.
    Inventors: Hao Zhang, Zhenjie He, Timothy C Merkel, Yoshiyuki Okamoto, Yasuhiro Koike
  • Patent number: 9551843
    Abstract: When a moving member moves to a fixing position, a fixing member moves to a second fixing position, a blade of the fixing member cuts into a protection layer of a cord, and thereby the cord is fixed. When the moving member moves to a releasing position, the fixing member moves to a second releasing position, the blade leaves the protection layer, and thereby the cord is released.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: January 24, 2017
    Assignees: HONDA TSUSHIN KOGYO CO., LTD., KEIO UNIVERSITY
    Inventors: Shigehiro Oi, Koichiro Yoshimura, Yasuhiro Koike