Patents by Inventor Keiji Emura

Keiji Emura 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).

  • Patent number: 11892670
    Abstract: A light emitting module including: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole; and a light source disposed in the light source placement part. In the schematic top view: the light adjusting hole is not positioned on a first straight line connecting (i) a center of the light source and (ii) a point in the sectioning groove that is farthest from the center of the light source, and a first lateral face of the light adjusting hole has a first region, and a line normal to the first region is oblique to a second straight line connecting (i) the center of the light source and (ii) a point in the sectioning groove that is closest to the center of the light source.
    Type: Grant
    Filed: October 25, 2022
    Date of Patent: February 6, 2024
    Assignee: NICHIA CORPORATION
    Inventors: Takuya Nakabayashi, Toru Hashimoto, Keiji Emura
  • Patent number: 11841135
    Abstract: A light emitting module includes: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole that, in a schematic top view, is located between the sectioning groove and the light source placement part; and a light source disposed in the light source placement part. A refractive index of an inside of the light adjusting hole is lower than a refractive index of the light guide member. In the schematic top view, the light adjusting hole is positioned to intersect with a first straight line connecting a center of the light source and a farthest point in the sectioning groove, the farthest point being farthest from the center of the light source.
    Type: Grant
    Filed: February 15, 2022
    Date of Patent: December 12, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Takuya Nakabayashi, Toru Hashimoto, Keiji Emura
  • Patent number: 11817529
    Abstract: A light emitting element includes a semiconductor structure, and first and second electrodes. In a plan view, the first electrode has a first connecting portion, and a first extending portion and exactly two second extending portions. The second electrode has a second connecting portion, and exactly two third extending portions. The first extending portion extends linearly from the first electrode connecting portion toward the second electrode connecting portion. Each of the two third extending portions includes a bent portion, and a linear portion located between the first extending portion and a respective one of linear portions of the two second extending portions, and along an imaginary line that extends through the two second extending portions and the two third extending portions in a direction perpendicular to the direction in which the first extending portion extends, an entirety of the second electrode is located inward of the two second extending portions.
    Type: Grant
    Filed: March 12, 2021
    Date of Patent: November 14, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Kosuke Sato, Keiji Emura
  • Patent number: 11808968
    Abstract: A planar light source includes a light source, a light guide member, and a sectioning member. The light guide member has a light source placement part in which the light source is disposed and a section defining part having a groove surrounding the light source placement part. The sectioning member has light reflectivity and is disposed in the section defining part. A first portion in the section defining part that is furthest from a center of the light source in a plan view has a transmittance higher than a transmittance of a second portion in the section defining part that is closest from the center of the light source in the plan view.
    Type: Grant
    Filed: July 31, 2022
    Date of Patent: November 7, 2023
    Assignee: NICHIA CORPORATION
    Inventor: Keiji Emura
  • Patent number: 11740401
    Abstract: A method of manufacturing a light emitting module includes: providing an intermediate that includes a light guide having a first principal face and a second principal face opposing the first principal face, a plurality of light sources disposed on the second principal face of the light guide, and a wiring layer disposed on the second principal face and electrically connected to the plurality of light sources; allowing the plurality of light sources to emit light and measuring optical characteristics of the emitted light; and forming an optical characteristic correcting element in the intermediate based on the measured optical characteristics.
    Type: Grant
    Filed: August 31, 2021
    Date of Patent: August 29, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Keiji Emura, Takuya Nakabayashi, Toru Hashimoto
  • Publication number: 20230238489
    Abstract: A light emitting element includes: a semiconductor structure; first and second electrodes formed above the semiconductor structure; and a protective film. In a plan view: the first electrode has a first connecting portion, a first extending portion, and two second extending portions, the second electrode has a second connecting portion, and two third extending portions, the first extending portion extends linearly in a direction from the first connecting portion toward the second connecting portion, the two second extending portions are located on opposite sides of the first extending portion, respectively, with each of the second extending portions having two bent portions and a linear portion extending parallel to the first extending portion and located between the two bent portions, and the two third extending portions are located between the first extending portion and the two second extending portions, respectively.
    Type: Application
    Filed: April 4, 2023
    Publication date: July 27, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Kosuke SATO, Keiji EMURA
  • Patent number: 11703714
    Abstract: Darkening of the periphery of a light-emitting module in which a plurality of light-emitting units are two-dimensionally arranged is reduced. The present light-emitting module has a light-emitting region including a plurality of light-emitting units two-dimensionally arranged, the light-emitting units each including a light-guiding plate having a first main surface, a first recess opening toward the first main surface, a second main surface opposite to the first main surface, and a second recess opening toward the second main surface; a light source inside the first recess; and a light-reflective first member inside the second recess. In each of the light-emitting units, a center of the light-emitting unit and a center of the second recess coincide with an optical axis of the light source in a plan view. In at least one of the light-emitting units, a center of the first member is closer to a center of the light-emitting region than the optical axis of the light source is in a plan view.
    Type: Grant
    Filed: October 10, 2022
    Date of Patent: July 18, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Keiji Emura, Toshinobu Katsumata
  • Publication number: 20230085463
    Abstract: A light-emitting device includes a wiring board, a plurality of light-emitting elements disposed on the wiring board, a light-reflecting member covering a lateral surface of each of the plurality of light-emitting elements, a plurality of light-transmitting layers each located above an emission surface of a corresponding one of the plurality of light-emitting elements, a plurality of light-reflecting layers disposed on the plurality of light-transmitting layers, respectively, a light-diffusing layer disposed above the plurality of light-reflecting layers and the light-reflecting member, and a low-refractive-index layer located between the light-reflecting member and the light-diffusing layer, around each pair of one of the plurality of light-transmitting layers and one of the light-reflecting layers, and having a refractive index lower than that of the plurality of light-transmitting layers.
    Type: Application
    Filed: October 17, 2022
    Publication date: March 16, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Takuya NAKABAYASHI, Ryohei YAMASHITA, Keiji EMURA, Tsuyoshi OKAHISA, Toshinobu KATSUMATA
  • Publication number: 20230059057
    Abstract: Darkening of the periphery of a light-emitting module in which a plurality of light-emitting units are two-dimensionally arranged is reduced. The present light-emitting module has a light-emitting region including a plurality of light-emitting units two-dimensionally arranged, the light-emitting units each including a light-guiding plate having a first main surface, a first recess opening toward the first main surface, a second main surface opposite to the first main surface, and a second recess opening toward the second main surface; a light source inside the first recess; and a light-reflective first member inside the second recess. In each of the light-emitting units, a center of the light-emitting unit and a center of the second recess coincide with an optical axis of the light source in a plan view. In at least one of the light-emitting units, a center of the first member is closer to a center of the light-emitting region than the optical axis of the light source is in a plan view.
    Type: Application
    Filed: October 10, 2022
    Publication date: February 23, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Keiji EMURA, Toshinobu KATSUMATA
  • Publication number: 20230060023
    Abstract: A light emitting module including: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole; and a light source disposed in the light source placement part. In the schematic top view: the light adjusting hole is not positioned on a first straight line connecting (i) a center of the light source and (ii) a point in the sectioning groove that is farthest from the center of the light source, and a first lateral face of the light adjusting hole has a first region, and a line normal to the first region is oblique to a second straight line connecting (i) the center of the light source and (ii) a point in the sectioning groove that is closest to the center of the light source.
    Type: Application
    Filed: October 25, 2022
    Publication date: February 23, 2023
    Applicant: NICHIA CORPORATION
    Inventors: Takuya NAKABAYASHI, Toru HASHIMOTO, Keiji EMURA
  • Patent number: 11520098
    Abstract: A light emitting module including: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole; and a light source disposed in the light source placement part. In the schematic top view: the light adjusting hole is not positioned on a first straight line connecting (i) a center of the light source and (ii) a point in the sectioning groove that is farthest from the center of the light source, and a first lateral face of the light adjusting hole has a first region, and a line normal to the first region is oblique to a second straight line connecting (i) the center of the light source and (ii) a point in the sectioning groove that is closest to the center of the light source.
    Type: Grant
    Filed: February 4, 2021
    Date of Patent: December 6, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Takuya Nakabayashi, Toru Hashimoto, Keiji Emura
  • Publication number: 20220381970
    Abstract: A planar light source includes a light source, a light guide member, and a sectioning member. The light guide member has a light source placement part in which the light source is disposed and a section defining part having a groove surrounding the light source placement part. The sectioning member has light reflectivity and is disposed in the section defining part. A first portion in the section defining part that is furthest from a center of the light source in a plan view has a transmittance higher than a transmittance of a second portion in the section defining part that is closest from the center of the light source in the plan view.
    Type: Application
    Filed: July 31, 2022
    Publication date: December 1, 2022
    Applicant: NICHIA CORPORATION
    Inventor: Keiji EMURA
  • Patent number: 11506932
    Abstract: Darkening of the periphery of a light-emitting module in which a plurality of light-emitting units are two-dimensionally arranged is reduced. The present light-emitting module has a light-emitting region including a plurality of light-emitting units two-dimensionally arranged, the light-emitting units each including a light-guiding plate having a first main surface, a first recess opening toward the first main surface, a second main surface opposite to the first main surface, and a second recess opening toward the second main surface; a light source inside the first recess; and a light-reflective first member inside the second recess. In each of the light-emitting units, a center of the light-emitting unit and a center of the second recess coincide with an optical axis of the light source in a plan view. In at least one of the light-emitting units, a center of the first member is closer to a center of the light-emitting region than the optical axis of the light source is in a plan view.
    Type: Grant
    Filed: July 26, 2021
    Date of Patent: November 22, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Keiji Emura, Toshinobu Katsumata
  • Patent number: 11506934
    Abstract: A light-emitting device includes a wiring board, a plurality of light-emitting elements disposed on the wiring board, a light-reflecting member covering a lateral surface of each of the plurality of light-emitting elements, a plurality of light-transmitting layers each located above an emission surface of a corresponding one of the plurality of light-emitting elements, a plurality of light-reflecting layers disposed on the plurality of light-transmitting layers, respectively, a light-diffusing layer disposed above the plurality of light-reflecting layers and the light-reflecting member, and a low-refractive-index layer located between the light-reflecting member and the light-diffusing layer, around each pair of one of the plurality of light-transmitting layers and one of the light-reflecting layers, and having a refractive index lower than that of the plurality of light-transmitting layers.
    Type: Grant
    Filed: August 30, 2021
    Date of Patent: November 22, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Takuya Nakabayashi, Ryohei Yamashita, Keiji Emura, Tsuyoshi Okahisa, Toshinobu Katsumata
  • Patent number: 11480319
    Abstract: A light emitting module includes: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole that, in a schematic top view, is located between the sectioning groove and the light source placement part; and a light source located in the light source placement part. A refractive index of an inside of the light adjusting hole is lower than a refractive index of the light guide member. In the schematic top view, the light adjusting hole is not positioned on a first straight line connecting a center of the light source and a farthest point in the sectioning groove, the farthest point being farthest from the center of the light source.
    Type: Grant
    Filed: February 5, 2021
    Date of Patent: October 25, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Takuya Nakabayashi, Toru Hashimoto, Keiji Emura
  • Patent number: 11393954
    Abstract: A light emitting element includes: a semiconductor structure including: a first semiconductor, an active layer, and a second semiconductor layer; a first electrode; a first insulating layer; a first internal electrode; a second internal electrode; a second insulating layer; a first external electrode; and a second external electrode.
    Type: Grant
    Filed: December 21, 2020
    Date of Patent: July 19, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Akihiro Nakamura, Keiji Emura
  • Publication number: 20220205614
    Abstract: A light-emitting device includes a light-emitting element, a first wavelength converting member, a second wavelength converting member, and a first light-transmissive member. The first light-transmissive member is located between the first wavelength converting member and the second wavelength converting member. The first light-transmissive member has a refractive index smaller than a refractive index of a base material of the one of the first wavelength converting member and the second wavelength converting member having a shorter peak emission wavelength than the other of the first wavelength converting member and the second wavelength converting member. Each of corresponding surfaces of lateral surfaces of the first wavelength converting member, lateral surfaces of the first light-transmissive member, and lateral surfaces of the second wavelength converting member may constitute a continuous light-emission surface.
    Type: Application
    Filed: December 22, 2021
    Publication date: June 30, 2022
    Applicant: NICHIA CORPORATION
    Inventors: Keiji EMURA, Tsuyoshi OKAHISA
  • Publication number: 20220170611
    Abstract: A light emitting module includes: a light guide member including: an emission region defined by a sectioning groove, a light source placement part located in the emission region, and a light adjusting hole that, in a schematic top view, is located between the sectioning groove and the light source placement part; and a light source disposed in the light source placement part. A refractive index of an inside of the light adjusting hole is lower than a refractive index of the light guide member. In the schematic top view, the light adjusting hole is positioned to intersect with a first straight line connecting a center of the light source and a farthest point in the sectioning groove, the farthest point being farthest from the center of the light source.
    Type: Application
    Filed: February 15, 2022
    Publication date: June 2, 2022
    Applicant: NICHIA CORPORATION
    Inventors: Takuya NAKABAYASHI, Toru HASHIMOTO, Keiji EMURA
  • Patent number: RE49298
    Abstract: The present invention provides a light emitting element capable or realizing at least one of lower resistance, higher output, higher power efficiency (1 m/W), higher mass productivity and lower cost of the element using a light transmissive electrode for an electrode arranged exterior to the light emitting structure. A semiconductor light emitting element includes a light emitting section, a first electrode and a second electrode on a semiconductor structure including first and second conductive type semiconductor layers, the first and the second electrodes respectively including at least two layers of a first layer of a light transmissive conductive film conducting to the first and the second conductive type semiconductor and a second layer arranged so as to conduct with the first layer. First and second light transmissive insulating films are respectively arranged so as to overlap at least one part of the first and the second layers.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: November 15, 2022
    Assignee: NICHIA CORPORATION
    Inventors: Masahiko Sano, Takahiko Sakamoto, Keiji Emura, Katsuyoshi Kadan
  • Patent number: RE49406
    Abstract: The present invention provides a light emitting element capable or realizing at least one of lower resistance, higher output, higher power efficiency (1 m/W), higher mass productivity and lower cost of the element using a light transmissive electrode for an electrode arranged exterior to the light emitting structure. A semiconductor light emitting element includes a light emitting section, a first electrode and a second electrode on a semiconductor structure including first and second conductive type semiconductor layers, the first and the second electrodes respectively including at least two layers of a first layer of a light transmissive conductive film conducting to the first and the second conductive type semiconductor and a second layer arranged so as to conduct with the first layer. First and second light transmissive insulating films are respectively arranged so as to overlap at least one part of the first and the second layers.
    Type: Grant
    Filed: July 10, 2019
    Date of Patent: January 31, 2023
    Assignee: NICHIA CORPORATION
    Inventors: Masahiko Sano, Takahiko Sakamoto, Keiji Emura, Katsuyoshi Kadan