WIDE BEAM ANGLE CREATION FOR SOLID STATE LIGHTING

摘要

Disclosed is a lens plate (10) comprising a plurality of polygonal aspherical lenslets (11) each defined around a Voronoi point (13), said polygonal lenslets combining to form a Voronoi tessellation, wherein each polygonal lenslet includes a rotationally symmetric portion (15) centered on its Voronoi point and an aspherical surface (21) with a continually decreasing curvature from the surface vertex (25) of said rotationally symmetrical portion towards its edges (17). Such a lens plate is capable of generates wide beam angles, e.g. beam angles in excess of 30° at FWHM of the beam with high optical efficiency. Also disclosed is an optical arrangement including such a lens plate, a lighting device including such an optical arrangement and an apparatus including such a lighting device.