Light emitting device and luminaire
AssigneeKoninklijke Philips N.V.
InventorsErik Boonekamp, Ludo Haenen
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Abstract
The present invention relates to a light emitting device 100 which employs light sources 102 having a narrow or limited light intensity distribution, and which device is arranged for redistributing the light from the light sources and outputting a light with a broader spatial light intensity distribution via a circumferential light output surface 115 arranged on a funnel-shaped light output portion 112. The light emitting device further comprises a light mixing portion 120 for mixing the light emitted from the light sources 112 before entering into the light output portion 112.
Claims14
A light emitting device comprising:
- a light unit having at least one light source;
- and
- a light guide unit;
- said light guide unit comprising:
- a light input portion for receiving light from said light source,
- a light output portion;
- and
- a light mixing portion arranged between the light input portion and the light output portion and reflecting light along an interior surface;
- said light output portion being funnel-shaped comprising:
- a base arranged to receive light from said light mixing portion;
- a convex light emitting upper surface;
- a concave lower surface;
- and
- a circumferential light output surface arranged substantially perpendicular to the light input portion;
- said light output surface interposed between said upper and lower surfaces;
- wherein said upper surface and said lower surface define a light guide path from said base to said circumferential light output surface to create a substantially toroidal intensity distribution.
A light emitting device comprising:
- a light unit having at least one light emitting diode positioned to output light into a light guide;
- said light guide having a light input area which receives light from said at least one light emitting diode;
- said light guide having an opposing end from said light input area forming a light output area;
- said light guide further having an elongated light mixing chamber interposed between the light input area and the light output area and reflecting light along an interior surface;
- said light guide interior surface formed from a plurality of substantially flat walls;
- a light output structure receiving light from said light output area of said light guide, said light output structure being funnel-shaped and including a base arranged to receive light from said light mixing chamber;
- said light output structure further having a convex light emitting upper surface and a concave lower surface;
- a circumferential light output surface on said light output structure arranged substantially perpendicular to the light input area of the light guide;
- said circumferential light output surface interposed between said convex upper surface and concave lower surface;
- wherein said upper surface and said lower surface define a light guide path from said base to said circumferential light output surface to create a substantially toroidal intensity distribution.
Dependencies are inferred from the claim text.