Patents Assigned to Toshinori Morizani
  • Patent number: 5131977
    Abstract: Herein disclosed is a method for manufacturing a base plate for a recording disc, which comprises steps of polishing the surface of the base plate of glass or aluminum, thereafter dispersing uniformly micro-crystals on the polished surface to form a portion where the micro-crystals are in contact with said polished surface, and subjecting the base plate to etching treatment with an etching agent in a gas phase or a liquid phase. Also disclosed is a base plate for a recording disc, which is obtained by uniformly dispersing micro-crystals on the surface of the base plate and subjecting the same to etching treatment, said base plate having very fine convexities and concavities on its surface.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: July 21, 1992
    Assignees: C. Itoh & Co., Ltd., Toshinori Morizani
    Inventors: Toshinori Morizane, Yuko Yoshida, Koichi Awazu