Transparent screen having intermittent portions for reducing ref

Details Transparent screen having intermittent portions for reducing ref Transparent screen having intermittent portions for reducing ref

1975-10-16

1976-06-29

Hix, L. T.

350129, G03B 2160

Patent

active

039663019

ABSTRACT:
A front projection screen manufactured from transparent material is disclosed. The back side of the screen includes a plurality of prism-like elements so that light incident upon the screen from a preferred direction is totally reflected by the screen, while light incident upon the screen from other directions will pass therethrough. The parallel ridges are intermittently interrupted by repeating surfaces formed parallel to the plane of the front surface of the screen. The sides of the prism-like elements on the back surface of the screen are curved to provide dispersion in a horizontal plane, while the front surface of the screen has segments of cylindrical columns formed thereon perpendicular to the prism-like elements to form an angular light spread in a vertical plane. The repeating surfaces formed on the back surface of the screen, and interrupting the plurality of parallel ridges thereon, permits ambient light directed from non-preferred directions to either be passed through the screen without reflection, or to be absorbed thereby, so that this light is not reflected back thereby. These repeating surfaces preferably, in the former case, comprise repeating planar surfaces, and in the latter case preferably comprise light absorbing coatings. In a preferred embodiment, were particularly repeating planar surfaces are employed, the length of each intermittent parallel ridge divided by the width of the adjacent planar surface is greater than the distance from the focal point of each cylindrical section on the front surface of the screen to the parallel ridge on the back surface divided by the thickness of the screen.

REFERENCES:
patent: 2351034 (1944-06-01), Gabor
patent: 2991693 (1961-07-01), MacNeille
patent: 3782805 (1974-01-01), Brown

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