Patents by Inventor Tomohito KAWASE

Tomohito KAWASE 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: 20180108809
    Abstract: The light emitting device includes a substrate, and an n-type conductive type semiconductor layer, a light emitting layer and a p-type conductive type semiconductor layer laminated in series on a surface of the substrate. The light emitting layer, the p-type conductive type semiconductor layer, and a portion of the n-type conductive type semiconductor layer excluding the vicinity of the peripheral portion compose a semiconductor laminate structure portion. A p-side transparent electrode layer is formed on a surface of the p-type conductive type semiconductor layer. The p-side transparent electrode covers a substantially whole area of a predetermined current injection region on a surface of the p-type conductive type semiconductor layer. A p-side electrode is formed on a surface of the p-side transparent electrode layer.
    Type: Application
    Filed: December 6, 2017
    Publication date: April 19, 2018
    Applicant: ROHM CO., LTD.
    Inventors: Takao FUJIMORI, Tomohito KAWASE, Yasuo NAKANISHI
  • Patent number: 9947834
    Abstract: A light emitting element includes: a substrate; a first conductive type semiconductor layer stacked on the substrate; a light emitting layer stacked on the first conductive type semiconductor layer; a second conductive type semiconductor layer stacked on the light emitting layer; an ITO layer stacked on the second conductive type semiconductor layer; and a reflective layer stacked on the ITO layer. The substrate is transparent to an emission wavelength of the light emitting layer, and the reflective layer includes a Ti-containing first layer stacked on the ITO layer to make contact with the ITO layer and an Al-containing second layer stacked on the first layer in an opposite side to the ITO layer.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: April 17, 2018
    Assignee: ROHM CO., LTD.
    Inventors: Tomoya Ebisawa, Tomohito Kawase
  • Patent number: 9871166
    Abstract: The light emitting device 1 includes a substrate 2, and an n-type conductive type semiconductor layer 3, a light emitting layer 4 and a p-type conductive type semiconductor layer 5 laminated in series on a surface 2A of the substrate 2. The light emitting layer 4, the p-type conductive type semiconductor layer 5, and a portion of the n-type conductive type semiconductor layer 3 excluding the vicinity of the peripheral portion compose a semiconductor laminate structure portion 6. A p-side transparent electrode layer 14 is formed on a surface of the p-type conductive type semiconductor layer 5. The p-side transparent electrode 14 covers a substantially whole area of a predetermined current injection region 13 on a surface of the p-type conductive type semiconductor layer 5. A p-side electrode 15 is formed on a surface of the p-side transparent electrode layer 14.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: January 16, 2018
    Assignee: ROHM CO., LTD.
    Inventors: Takao Fujimori, Tomohito Kawase, Yasuo Nakanishi
  • Publication number: 20150214428
    Abstract: The light emitting device 1 includes a substrate 2, and an n-type conductive type semiconductor layer 3, a light emitting layer 4 and a p-type conductive type semiconductor layer 5 laminated in series on a surface 2A of the substrate 2. The light emitting layer 4, the p-type conductive type semiconductor layer 5, and a portion of the n-type conductive type semiconductor layer 3 excluding the vicinity of the peripheral portion compose a semiconductor laminate structure portion 6. A p-side transparent electrode layer 14 is formed on a surface of the p-type conductive type semiconductor layer 5. The p-side transparent electrode 14 covers a substantially whole area of a predetermined current injection region 13 on a surface of the p-type conductive type semiconductor layer 5. A p-side electrode 15 is formed on a surface of the p-side transparent electrode layer 14.
    Type: Application
    Filed: January 20, 2015
    Publication date: July 30, 2015
    Applicant: ROHM CO., LTD.
    Inventors: Takao FUJIMORI, Tomohito KAWASE, Yasuo NAKANISHI
  • Patent number: 8946752
    Abstract: The semiconductor device includes a substrate, a semiconductor layer which is formed on the substrate and includes a light emitting layer, and a diffraction/scattering film for diffracting or scattering light generated at the light emitting layer. The diffraction/scattering film is formed between the light emitting layer and the substrate, has a side surface slanted with respect to a film thickness direction thereof, and has a composition gradient in the film thickness direction.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: February 3, 2015
    Assignee: Rohm Co., Ltd.
    Inventors: Tomohito Kawase, Toshikuni Shinohara
  • Publication number: 20140191268
    Abstract: A light emitting element includes: a substrate; a first conductive type semiconductor layer stacked on the substrate; a light emitting layer stacked on the first conductive type semiconductor layer; a second conductive type semiconductor layer stacked on the light emitting layer; an ITO layer stacked on the second conductive type semiconductor layer; and a reflective layer stacked on the ITO layer. The substrate is transparent to an emission wavelength of the light emitting layer, and the reflective layer includes a Ti-containing first layer stacked on the ITO layer to make contact with the ITO layer and an Al-containing second layer stacked on the first layer in an opposite side to the ITO layer.
    Type: Application
    Filed: January 7, 2014
    Publication date: July 10, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Tomoya EBISAWA, Tomohito KAWASE
  • Publication number: 20140070253
    Abstract: The semiconductor device includes a substrate, a semiconductor layer which is formed on the substrate and includes a light emitting layer, and a diffraction/scattering film for diffracting or scattering light generated at the light emitting layer. The diffraction/scattering film is formed between the light emitting layer and the substrate, has a side surface slanted with respect to a film thickness direction thereof, and has a composition gradient in the film thickness direction.
    Type: Application
    Filed: September 4, 2013
    Publication date: March 13, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Tomohito KAWASE, Toshikuni SHINOHARA