Reflection type screen

Claim 1

A reflection type projection screen, comprising, a transparent substrate having a thickness of 0.1 to 2.0 mm; a plurality of convex lenses formed on the front surface of said transparent substrate and being of a size so as to be nondiscriminatable from an observers position; said convex lenses having a focal length which gives a focus behind the rear surface of said transparent substrate and wherein the ratio of vertical height to transversal width of said lenses is greater than one and the vertical height is 0.1 to 2.0 mm; said rear surface of said transparent substrate having a plurality of mirror areas and a plurality of light absorbing areas where the mirror areas constitute from 28% to 37% of the total area and the light absorbing areas constitute from 72% to 63% of the total area; wherein light rays arriving from a projector substantially parallel to the optical axis of the said lenses impinge upon the mirror areas, are focused to a point within said substrate and pass back through said lenses to be externally diffused, while light rays arriving at an angle not substantially parallel to the optical axis of said lenses impinge upon the light absorbing areas and are absorbed; wherein the thickness and refractive index of said transparent substrate and the focal length of said lenses are selected so as to diffuse the reflected rays at the same angle as the range of observation.