Patents by Inventor Yasuto AKATSUKA

Yasuto AKATSUKA 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).

  • Light emitting apparatus and projector
    Patent number: 11552216
    Abstract: A light emitting apparatus includes an electrode and a laminated structure. The laminated structure includes an n-type first semiconductor layer, a light emitting layer, a p-type second semiconductor layer, a tunnel junction layer, and an n-type third semiconductor layer. The electrode is electrically connected to the first semiconductor layer. The first semiconductor layer, the light emitting layer, the second semiconductor layer, the tunnel junction layer, and the third semiconductor layer are arranged in a presented order. The light emitting layer and the first semiconductor layer form a columnar section.
    Type: Grant
    Filed: March 8, 2021
    Date of Patent: January 10, 2023
    Inventors: Yasuto Akatsuka, Hiroyuki Shimada, Koichiro Akasaka, Katsumi Kishino
  • LIGHT EMITTING APPARATUS AND PROJECTOR
    Publication number: 20220166194
    Abstract: A light emitting apparatus includes a laminate including a columnar section. The columnar section includes an n-type semiconductor layer, a first p-type semiconductor layer, a light emitting layer provided between the n-type semiconductor layer and the first p-type semiconductor layer, and a second p-type semiconductor layer in contact with the first p-type semiconductor layer. The first p-type semiconductor layer is provided between the light emitting layer and the second p-type semiconductor layer. The first p-type semiconductor layer has a c-plane and a facet surface. The second p-type semiconductor layer has a c-plane region provided at the c-plane and a facet-surface region provided at the facet surface. The c-plane region has negatively polarized charges at an interface with the first p-type semiconductor layer. The facet-surface region has positively polarized charges at the interface.
    Type: Application
    Filed: November 18, 2021
    Publication date: May 26, 2022
    Applicants: SEIKO EPSON CORPORATION, SOPHIA SCHOOL CORPORATION
    Inventors: Yasuto AKATSUKA, Katsumi KISHINO
  • Light Emitting Apparatus And Projector
    Publication number: 20210280740
    Abstract: A light emitting apparatus includes an electrode and a laminated structure. The laminated structure includes an n-type first semiconductor layer, a light emitting layer, a p-type second semiconductor layer, a tunnel junction layer, and an n-type third semiconductor layer. The electrode is electrically connected to the first semiconductor layer. The first semiconductor layer, the light emitting layer, the second semiconductor layer, the tunnel junction layer, and the third semiconductor layer are arranged in a presented order. The light emitting layer and the first semiconductor layer form a columnar section.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 9, 2021
    Inventors: Yasuto AKATSUKA, Hiroyuki SHIMADA, Koichiro AKASAKA