Patent ID: 8294992
Filing Date: 2012-10-23
Classification: B29D,G02B

Abstract:
1. A projection-receiving surface comprising: a refraction surface having an undulating contour, said undulating contour of said first surface comprising a plurality of alternating convex cylindrical surface segments and concave cylindrical surface segments, said convex cylindrical surface segments and concave cylindrical surface segments of said undulating contour of said first surface arranged with cylindrical axes in a first direction; and a reflection surface having an undulating contour, said undulating contour of said second surface comprising a plurality of alternating convex cylindrical surface segments and concave cylindrical surface segments, said convex cylindrical surface segments and concave cylindrical surface segments of said undulating contour of said second surface arranged with cylindrical axes in a second direction; wherein said first direction and second direction are skew with each other; and wherein said undulating contour of said refraction surface approximately follows a curve defined by application of an equation of y=sqrt{[(qn−1)P/tanφ] 2 −(x−1) 2 ]}−{P/2tan(φ)}, where n is an index of refraction, q is a surface interaction coefficient, P is a dimension across a pixel, (φ) is one half of a full field angle, x and y are coordinates defining the curve, 1 is an offset parameter =mP/2, with m=1,3,5, . . . M.