Distributor of electromagnetic radiation, particularly a projection screen.

摘要

The electromagnetic-radiation distributor is combined with at least one radiation emitter (2) and with at least one receiver (16) of the distributed radiation, and is of the type having a surface which has a predetermined multiplicity of optically directional elements. It is characterised in that, for each element, the mean normal (21) to its optically active surface is individually oriented so as to form equal angles with, on the one hand, the straight line substantially constituting the mean axis of the geometrical solid angle having its apex at the mean centre of the element and surrounding as closely as possible a predetermined region where the receiver or receivers are located and with, on the other hand, the straight line joining the mean centre of the element to the mean centre of the zone where the emitter or emitters are located, and in that the element is shaped optically over its entire active surface so that the solid angle into which the radiation is distributed is, in all its plane cross-sections, at least equal to the said geometrical solid angle. <IMAGE>