Patent ID: 6560025
Filing Date: 2003-05-06
Classification: G03B

Abstract:
A translucent screen used for a projector system which creates a multi-screen by projecting respective images from a plurality of arranged projectors, comprising:a first surface where a plurality of condensing optical surfaces for condensing entering luminous flux are arranged at a predetermined cycle; and a second surface where a plurality of optical surfaces for deflecting the optical paths of lights entering approximately the center of the condensing optical surfaces arranged on said first surface in a direction approximately vertical to the main surface of the translucent screen are arranged at a predetermined cycle, wherein said first surface and second surface are set such that when the same images are projected from two adjacent projectors out of said plurality of projectors, the beams from said two adjacent projectors emitted from said second surface are set such that the brightness is approximately the same regardless the direction of observing said translucent screen, and that the images constituting the multi-screen continue smoothly, wherein said second surface is disposed approximately at the focal positions of the condensing optical surfaces arranged on said first surface, wherein the condensing optical surfaces arranged on said first surface are convex lens surfaces, and said second surface is comprised of the plurality of convex lens surfaces corresponding to the convex lens surfaces of said first surface respectively, which are arranged two-dimensionally approximately at the focal positions of the convex lens surfaces of said first surface, wherein the condensing optical surfaces comprised of the convex lenses on said first surface are comprised of spherical surfaces having a predetermined entrance aperture, and wherein said first surface defines the condensing optical surfaces to be the actual entrance aperture by continuously and cyclically arranging the condensing optical surfaces, which are a part of the spherical surfaces, at a space shorter than the diameter of the spherical surface so as to define said condensing optical surface to be a predetermined entrance aperture.