Patents by Inventor Tadahiko Kawasaki

Tadahiko Kawasaki 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: 7332744
    Abstract: A semiconductor light-emitting device capable of improving device characteristics such as life and reliability is provided. A current confinement layer includes a non-oxidized region made of AlAs or the like corresponding to a current injection region in an active layer, and an oxidized region made of aluminum oxide corresponding to a non-current injection region. The oxidized region is formed by forming a non-oxidized layer made of AlAs or the like and then oxidizing part of the non-oxidized layer at a temperature from 240° C. to less than 375° C. The thickness of the oxidized region is preferably from 10 nm to 1000 nm. The width of the one side of the oxidized region is one time or more of the width of the non-oxidized region or seven times or less thereof The distance between current confinement layer and the active layer is preferably 50 nm or more, or 500 nm or less, and more preferably 180 nm or more.
    Type: Grant
    Filed: November 8, 2004
    Date of Patent: February 19, 2008
    Assignee: Sony Corporation
    Inventors: Tomonori Hino, Hironobu Narui, Takayuki Kawasumi, Tsuyoshi Nagatake, Yuichi Kuromizu, Tadahiko Kawasaki, Noriko Kobayashi, Masaki Shiozaki, Jugo Mitomo, Michiko Komine
  • Publication number: 20070091966
    Abstract: A semiconductor light-emitting device capable of improving device characteristics such as life and reliability is provided. A current confinement layer includes a non-oxidized region made of AlAs or the like corresponding to a current injection region in an active layer, and an oxidized region made of aluminum oxide corresponding to a non-current injection region. The oxidized region is formed by forming a non-oxidized layer made of AlAs or the like and then oxidizing part of the non-oxidized layer at a temperature from 240° C. to less than 375° C. The thickness of the oxidized region is preferably from 10 nm to 1000 nm. The width of the one side of the oxidized region is one time or more of the width of the non-oxidized region or seven times or less thereof. The distance between current confinement layer and the active layer is preferably 50 nm or more, or 500 nm or less, and more preferably 180 nm or more.
    Type: Application
    Filed: December 20, 2006
    Publication date: April 26, 2007
    Inventors: Tomonori Hino, Hironobu Narui, Takayuki Kawasumi, Tsuyoshi Nagatake, Yuichi Kuromizu, Tadahiko Kawasaki, Noriko Kobayashi, Masaki Shiozaki, Jugo Mitomo, Michiko Komine
  • Publication number: 20070086499
    Abstract: A semiconductor light-emitting device capable of improving device characteristics such as life and reliability is provided. A current confinement layer includes a non-oxidized region made of AlAs or the like corresponding to a current injection region in an active layer, and an oxidized region made of aluminum oxide corresponding to a non-current injection region. The oxidized region is formed by forming a non-oxidized layer made of AlAs or the like and then oxidizing part of the non-oxidized layer at a temperature from 240° C. to less than 375° C. The thickness of the oxidized region is preferably from 10 nm to 1000 nm. The width of the one side of the oxidized region is one time or more of the width of the non-oxidized region or seven times or less thereof. The distance between current confinement layer and the active layer is preferably 50 nm or more, or 500 nm or less, and more preferably 180 nm or more.
    Type: Application
    Filed: December 20, 2006
    Publication date: April 19, 2007
    Inventors: Tomonori Hino, Hironobu Narui, Takayuki Kawasumi, Tsuyoshi Nagatake, Yuichi Kuromizu, Tadahiko Kawasaki, Noriko Kobayashi, Masaki Shiozaki, Jugo Mitomo, Michiko Komine
  • Publication number: 20050139856
    Abstract: A semiconductor light-emitting device capable of improving device characteristics such as life and reliability is provided. A current confinement layer includes a non-oxidized region made of AlAs or the like corresponding to a current injection region in an active layer, and an oxidized region made of aluminum oxide corresponding to a non-current injection region. The oxidized region is formed by forming a non-oxidized layer made of AlAs or the like and then oxidizing part of the non-oxidized layer at a temperature from 240° C. to less than 375° C. The thickness of the oxidized region is preferably from 10 nm to 1000 nm. The width of the one side of the oxidized region is one time or more of the width of the non-oxidized region or seven times or less thereof The distance between current confinement layer and the active layer is preferably 50 nm or more, or 500 nm or less, and more preferably 180 nm or more.
    Type: Application
    Filed: November 8, 2004
    Publication date: June 30, 2005
    Inventors: Tomonori Hino, Hironobu Narui, Takayuki Kawasumi, Tsuyoshi Nagatake, Yuichi Kuromizu, Tadahiko Kawasaki, Noriko Kobayashi, Masaki Shiozaki, Jugo Mitomo, Michiko Komine