Rear projection screen
First Claim
1. A rear projection screen of the type comprising a circular Fresnel lens consisting of a plurality of concentrically circular lens elements and a lenticular lens means having a plurality of corrugated parallel convex lens elements formed over one surface thereof, the other surface of said lenticular lens means being formed with a plurality of parallel projections or protrusions extended in the longitudinal direction of said lenticular lens elements, masking stripes being formed over said parallel projections or protrusions, the improvement wherein the side surfaces of each of said parallel projections or protrusions are so cut that they will not intercept the light rays emerging from said corrugated parallel convex lens elements of said lenticular lens means.
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Accused Products
Abstract
A rear projection or translucent screen consisting of a circular Fresnel lens consisting of a plurality of concentrically circular lens elements and a lenticular lens having a plurality of corrugated parallel convex lens elements. Parallel projections or ridges are formed on the surface opposite to the lens surface of the lenticular lens and masking stripes are formed over the projections or ridges. The side surfaces of the projections or ridges are so defined that they will not intercept the light rays emerging from the corrugated parallel convex lens elements. According to one embodiment of the present invention, the top of each of the projections or ridges is formed with a groove and an ink is filled into the groove. According to another embodiment of the present invention, the position of each projection or ridge is deviated from the boundary between the adjacent corrugated parallel convex lens elements by a distance which is determined by a predetermined relationship.
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Citations
10 Claims
- 1. A rear projection screen of the type comprising a circular Fresnel lens consisting of a plurality of concentrically circular lens elements and a lenticular lens means having a plurality of corrugated parallel convex lens elements formed over one surface thereof, the other surface of said lenticular lens means being formed with a plurality of parallel projections or protrusions extended in the longitudinal direction of said lenticular lens elements, masking stripes being formed over said parallel projections or protrusions, the improvement wherein the side surfaces of each of said parallel projections or protrusions are so cut that they will not intercept the light rays emerging from said corrugated parallel convex lens elements of said lenticular lens means.
Specification