Patents Assigned to Fantacia
  • Objective lens system with aspheric Fresnel elements
    Patent number: 4293196
    Abstract: A high speed projection lens system particularly adaptable for a television projection system having a viewing screen and a video image forming surface is provided. The projection lens system includes a first thin meniscus lens element convex to the projection screen having an aspherical Fresnel type surface; a second thin meniscus lens element concave to the projection screen having an aspherical Fresnel type surface and a weak third thin aspherical meniscus lens element.
    Type: Grant
    Filed: August 13, 1979
    Date of Patent: October 6, 1981
    Assignee: Fantacia
    Inventor: Robert S. Hilbert