Patents by Inventor Kiyokazu Thoma

Kiyokazu Thoma 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).

  • Magnetic recording media fabrication method
    Patent number: 5691008
    Abstract: A magnetic recording medium fabrication device includes a cooling drum around which a substrate runs while being cooled thereby, an ion gun arranged upstream to a vapor deposition station for kicking out particles absorbed on the plane of the substrate, a cooling body arranged between the cooling drum and ion gun for absorbing kicked out particles and a vapor deposition means for depositing a magnetic layer on the substrate at the vapor deposition station. The magnetic particles forming the magnetic layer that have residual magnetization vectors within .+-.10.degree. of the easy axis direction including the magnetic anisotropy of the medium are greater than or equal to 70% and less than or equal to 90% of the total amount of magnetic particles.
    Type: Grant
    Filed: October 12, 1995
    Date of Patent: November 25, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiyokazu Thoma, Kazunari Yoshimoto, Ryuji Sugita, Tatsuaki Ishida
  • Magnetic recording media, magnetic recording media fabrication method, and fabrication equipment
    Patent number: 5679166
    Abstract: A magnetic recording medium fabrication device includes a cooling drum around which a substrate runs while being cooled thereby, an ion gun arranged upstream to a vapor deposition station for kicking out particles absorbed on the plane of the substrate, a cooling body arranged between the cooling drum and ion gun for absorbing kicked out particles and a vapor deposition device for depositing a magnetic layer on the substrate at the vapor deposition station. The magnetic particles forming the magnetic layer that have residual magnetization vectors within .+-.10.degree. of the easy axis direction including the magnetic anisotropy of the medium are greater than or equal to 70% and less than or equal to 90% of the total amount of magnetic particles.
    Type: Grant
    Filed: October 12, 1995
    Date of Patent: October 21, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiyokazu Thoma, Kazunari Yoshimoto, Ryuji Sugita, Tatsuaki Ishida
  • Magnetic recording medium having a ferromagnetic thin film in which 70% to 90% of the total magnetic particles have residual magnetization vectors within .+-.10.degree. of the easy axis direction
    Patent number: 5569523
    Abstract: A magnetic recording medium fabrication device includes a cooling drum around which a substrate runs while being cooled thereby, an ion gun arranged upstream to a vapor deposition station for kicking out particles absorbed on the plane of the substrate, a cooling body arranged between the cooling drum and ion gun for absorbing kicked out particles and a vapor deposition means for depositing a magnetic layer on the substrate at the vapor deposition station. The magnetic particles forming the magnetic layer that have residual magnetization vectors within .+-.10.degree. of the easy axis direction including the magnetic anisotropy of the medium are greater than or equal to 70% and less than or equal to 90% of the total amount of magnetic particles.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: October 29, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiyokazu Thoma, Kazunari Yoshimoto, Ryuji Sugita, Tatsuaki Ishida