Patents by Inventor Mamoru Ishizuka

Mamoru Ishizuka 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 guide member and light guide member manufacturing method
    Patent number: 10295725
    Abstract: A light guide member includes a reflective surface with a diffusion groove array. The diffusion groove array includes diffusion grooves arranged in the reflective surface in a length direction of the light guide member. The diffusion groove array includes, as the diffusion grooves, at least two inspection grooves and a non-inspection diffusion groove. The two inspection grooves are spaced in the length direction of the light guide member. The non-inspection diffusion groove is between the two inspection grooves. An intermediate part, in a length direction, of each of the two inspection grooves is divided by an ungrooved portion with no groove.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: May 21, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hideki Koizumi, Takeshi Ito, Tatsuji Ono, Yoshio Obata, Mamoru Ishizuka
  • LIGHT GUIDE MEMBER AND LIGHT GUIDE MEMBER MANUFACTURING METHOD
    Publication number: 20170205562
    Abstract: A light guide member includes a reflective surface with a diffusion groove array. The diffusion groove array includes diffusion grooves arranged in the reflective surface in a length direction of the light guide member. The diffusion groove array includes, as the diffusion grooves, at least two inspection grooves and a non-inspection diffusion groove. The two inspection grooves are spaced in the length direction of the light guide member. The non-inspection diffusion groove is between the two inspection grooves. An intermediate part, in a length direction, of each of the two inspection grooves is divided by an ungrooved portion with no groove.
    Type: Application
    Filed: July 21, 2015
    Publication date: July 20, 2017
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LT D.
    Inventors: Hideki KOIZUMI, Takeshi ITO, Tatsuji ONO, Yoshio OBATA, Mamoru ISHIZUKA
  • Perpendicular magnetic recording medium
    Patent number: 4824539
    Abstract: A Co-Cr perpendicular magnetic recording medium includes a chromium oxide film formed on a Co-Cr perpendicular magnetization film, and a SiO.sub.2 protective film formed on the chromium oxide film. The chromium oxide film is formed by conducting a heating treatment to the surface of the Co-Cr perpendicular magnetization film in an oxygen atmosphere of about 10 .sup.-4 to 10.sup.-3 Torr, at a temperature of about 300.degree. C. to 400.degree. C. for about two hours. The chromium oxide film has a thickness of about 20 to 200 .ANG.. The SiO.sub.2 protective film has a thickness greater than 50 .ANG., but the total thickness of the chromium oxide film and the SiO.sub.2 protective film is selected between 70 and 300 .ANG..
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: April 25, 1989
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tomohisa Komoda, Mamoru Ishizuka, Shuhei Tsuchimoto, Mitsuhiko Yoshikawa
  • Perpendicular magnetic recording medium
    Patent number: 4725482
    Abstract: A Co-Cr perpendicular magnetic recording medium includes a chromium oxide film formed on a Co-Cr perpendicular magnetization film, and a SiO.sub.2 protective film formed on the chromium oxide film. The chromium oxide film is formed by conducting a heating treatment to the surface of the Co-Cr perpendicular magnetization film in an oxygen atmosphere of about 10.sup.-4 to 10.sup.-3 Torr, at a temperature of about 300.degree. C. to 400.degree. C. for about two hours. The chromium oxide film has a thickness of about 20 to 200 .ANG.. The SiO.sub.2 protective film has a thickness greater than 50 .ANG., but the total thickness of the chromium oxide film and the SiO.sub.2 protective film is selected between 70 and 300 .ANG..
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: February 16, 1988
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tomohisa Komoda, Mamoru Ishizuka, Shuhei Tsuchimoto, Mitsuhiko Yoshikawa