Edge-Lit Stepped Light Guide for Downlight Module

摘要

A light guide 2 for a ceiling downlight module 1 provides a batwing light distribution in a compact, flat form factor using edge-lit source light injection. A plurality of solid state light sources 16 inject light from peripheral side surface 12 inward into light guide 2 which has a disc-shaped light guide body 4 having a set of concentric annular steps or faces 42, 44, 46, 48, 50, 52 between which inwardly-facing light-exit rings or facets 24, 26, 28, 30, 32, 34 are formed. Light exiting the ring-shaped facets 24-34 provides substantial light intensity in lateral directions away from a normal optical axis A of light guide 2. Light exiting from facets 24-34 created an advantageous and aesthetically pleasing appearance of lighted rings.

主权项

1. An edge-lit light module (1) for a lamp, comprising,
a light guide (2) having a disc-shaped body (4) rotationally symmetric about an optical axis (A), said body (4) having in top view a circular shape, said body (4) having a bottom surface (6), a light exit surface (10) adapted to output light, said light exit surface (10) being disposed opposite said bottom surface (6), and a radially outwardly located peripheral side surface (12), the side surface (12) defining a light entrance window (14); a plurality of solid state light sources (16) disposed proximate said side surface (12) and arranged to emit light into said light entrance window (14) generally radially inwards; and said light exit surface (10) comprising a plurality of concentric, radially inwardly-facing ring-shaped facets (24, 26, 28, 30, 32, 34), and each successively more radially outwardly-disposed said ring-shaped facet (28; 26) being spaced successively further, as seen in a direction along the optical axis (A) extending from the bottom surface (6) towards the light exit surface (10), from said bottom surface (6) than an adjacent more radially inwardly-disposed said ring-shaped facet (26; 24).