Optical device for e.g. public lighting equipment, has cavities with revolution profile whose one edge is in contact with curve that is identical to Bezier curve, where Bezier curve is defined by segments tangent to one end of former curve

摘要

The device (1) has a thick sheet (2) made of transparent material and facing LEDs (A). Each LED produces light beam along a direction (D). The sheet has a large face (3) and cavities (4) placed with respect to the LEDs, where a revolution profile of the cavities is composed of an arc. The bend radius of the arc is small with respect to other dimensions of the profile. An edge of the profile is perpendicular to the direction and another edge is in contact with a curve that is identical to Bezier curve defined by segments. Each segment is tangent to one end of the former curve.