Screen for the reproduction of three-dimensional static or moving images, and method of manufacturing it

Claim 1

A projection screen for reproducing three-dimensional images with a horizontal parallax, said images being captured from a plurality of different horizontally aligned points and being projected onto the screen by the same plurality of different horizontally aligned projection lenses, the screen comprising, a transparent sheet of parallel horizontal cylindrical lenses (2) and, another transparent sheet of parallel other cylindrical lenses (1), the sheets being substantially parallel to each other, the transversal size of the other cylindrical lenses (1) being so small that they cannot be perceived and a resultant horizontal aperture (G) of the other cylindrical lenses (1) is greater than a value obtained when the distance between two adjacent projection lenses is divided by the projection distance and less than twice this value, the transversal size of the horizontal cylindrical lenses (2) also being so small that they cannot be perceived, the cylindrical lenses (1, 2) having semi-circular cross sections and a common focal plane, wherein at least one (a) the cylindrical lenses (1, 2) are covered by a transparent substance with a refractive index (n') different from the refractive lens index (n) of the cylindrical lenses (1, 2) in order to decrease the resultant horizontal aperture (G), the refractive index (n') being determined so that the resultant horizontal aperture (G) is obtained, and (b) the other cylindrical lenses (1) are arranged at an angle alpha with respect to the horizontal cylindrical lenses (2) which angle alpha is greater than 0° and smaller than 90°, said angle alpha being determined so that the resultant horizontal aperture (G) is obtained.