Patents by Inventor Fujio Okuyama

Fujio Okuyama 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).

  • Die and glass material for forming glass substrate, method for manufacturing glass substrate, and magnetic disk glass substrate
    Patent number: 6718799
    Abstract: A glass material (4) is placed in a forming die including a pair of upper and lower dies (1, 2) and a control member (3) for controlling the space between the upper and the lower die, and then heated, softened, and molded by pressure into a glass substrate in the shape of a parallel plate. The amount of thermal contraction of the control member is smaller than that of the glass material. Therefore, the glass substrate is released from the die when cooled after molding. The present invention can provide a glass substrate that is excellent in smoothness and form accuracy of the surface, and that is suitable for recording media such as magnetic disks that are inexpensive and suitable for mass production.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: April 13, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuaki Takagi, Kunio Hibino, Tomokazu Tokunaga, Fujio Okuyama, Minoru Onoda
  • Die and glass material for forming glass substrate, method for manufacturing glass substrate, and magnetic disk glass substrate
    Publication number: 20030121286
    Abstract: A glass material (4) is placed in a forming die including a pair of upper and lower dies (1, 2) and a control member (3) for controlling the space between the upper and the lower die, and then heated, softened, and molded by pressure into a glass substrate in the shape of a parallel plate. The amount of thermal contraction of the control member is smaller than that of the glass material. Therefore, the glass substrate is released from the die when cooled after molding. The present invention can provide a glass substrate that is excellent in smoothness and form accuracy of the surface, and that is suitable for recording media such as magnetic disks that are inexpensive and suitable for mass production.
    Type: Application
    Filed: February 4, 2003
    Publication date: July 3, 2003
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuaki Takagi, Kunio Hibino, Tomokazu Tokunaga, Fujio Okuyama, Minoru Onoda
  • Glass substrate forming mold and production method for glass substrate
    Patent number: 6539750
    Abstract: A glass material (4) is placed in a forming die including a pair of upper and lower dies (1, 2) and a control member (3) for controlling the space between the upper and the lower die, and then heated, softened, and molded by pressure into a glass substrate in the shape of a parallel plate. The amount of thermal contraction of the control member is smaller than that of the glass material. Therefore, the glass substrate is released from the die when cooled after molding. The present invention can provide a glass substrate that is excellent in smoothness and form accuracy of the surface, and that is suitable for recording media such as magnetic disks that are inexpensive and suitable for mass production.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: April 1, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuaki Takagi, Kunio Hibino, Tomokazu Tokunaga, Fujio Okuyama, Minoru Onoda