Patents by Inventor Koichi Maruyama

Koichi Maruyama 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 exposure apparatus for manufacturing color picture tubes
    Patent number: 3982252
    Abstract: In light exposure apparatus wherein the face plate of a color picture tube is exposed to the light from a light source through a swinging illumination intensity correcting filter, a correction lens and a color selection electrode, the effective surface of the illumination intensity correcting filter comprises a plurality of regions having different light transmitting ability, and the effect of the optical characteristics at the interfaces between the regions is arranged and substantially eliminated by the swinging motion of the illumination intensity correcting filter.
    Type: Grant
    Filed: August 22, 1974
    Date of Patent: September 21, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Eiichi Yamazaki, Koichi Maruyama, Toshio Ueda, Hiroshi Yokomizo, Iwao Ogura
  • Correction lenses utilized to form fluorescent screens of colour picture tubes
    Patent number: 3936151
    Abstract: In a correction lens wherein the effective surface thereof has at least a lens member having no island shaped portion, said member being defined by the step shaped border line never closing by themselves to form an island shaped lens segment on said correction lens surface.
    Type: Grant
    Filed: December 4, 1973
    Date of Patent: February 3, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Eiichi Yamazaki, Toshio Ueda, Koichi Maruyama, Iwao Ogura