Patent ID: 7715098

Claim:
A projection screen having increased contrast between reflected projected light and ambient light incident thereon, comprising in combination: a plurality of optical elements, each optical element including a lens disposed on a forward surface of said projection screen effective for receiving the projected light and for focusing the light at first chosen distance therefrom along a first optical axis, said lens having a forward surface facing the incident light, a portion of the forward surface of said lens near the periphery thereof forming a facet; a reflective surface facing the incident light beam, centered along the first optical axis and tilted relative thereto effective for focusing the light beam at a second chosen distance therefrom along a second optical axis intersecting the first optical axis at said reflecting surface; whereby a first plane which intersects the facet is defined by the first optical axis and the second optical axis, and a second plane including the first optical axis and orthogonal to the first plane is defined; a first baffle disposed in the vicinity of the first chosen distance along the first optical axis on the opposing side of the second plane from the facet, for blocking light; and a second baffle disposed approximately at the second chosen distance from the reflecting surface, and having a hole therein for permitting focused light reflected from said reflective surface to pass therethrough and emerge through the forward surface of said lens through said facet.