Patents Assigned to Yamamoto Kogaku Kabushiki Kaisha
  • Method and apparatus for manufacturing lenses and a lens manufactured thereby
    Patent number: 6165392
    Abstract: A method of manufacturing a lens having a lens body integral with a functional sheet on one side thereof, includes an insert molding process including the steps of: placing the functional sheet as an insert in position in a mold defining a suction hole therein; and while attracting the functional sheet against a molding surface of the mold by a peripheral portion thereof by suction through the suction hole, supplying to the mold a molten plastic material for forming the lens body, to form the lens.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: December 26, 2000
    Assignee: Yamamoto Kogaku Kabushiki Kaisha
    Inventors: Nobuyuki Kobuchi, Masahiko Okamoto