Lighting device and luminaire comprising the same
Disclosed is a lighting device ( 200 ) comprising a mounting surface ( 201 ); a lens ( 100 ) comprising a lens body ( 101 ) having an inner surface ( 102 ) encapsulating a cavity ( 103 ) and delimiting an entrance to said cavity, said entrance facing the mounting surface, the inner surface comprising a plurality of adjoining surface sections each defining a segment of the cavity, wherein each segment has a narrowing region distal to the entrance delimited by a curved portion ( 106 ) of the surface section delimiting said segment; and an elongate carrier ( 202 ) extending from the mounting surface into the cavity segments through the cavity entrance and comprising a plurality of solid state lighting elements ( 203 ) configured to emit light towards the lens body. Further disclosed is a luminaire comprising the said lighting device.
1. A lighting device comprising:
a mounting surface;
a lens comprising a lens body having an inner surface encapsulating a cavity and delimiting an entrance to said cavity, said entrance facing the mounting surface, the inner surface comprising a plurality of adjoining surface sections each defining a segment of the cavity, wherein each segment has a narrowing region distal to the entrance delimited by a curved portion of the surface section delimiting said segment; and
an elongate carrier extending from the mounting surface into the cavity segments through the cavity entrance and comprising a plurality of solid state lighting elements configured to emit light towards the lens body;
wherein the cavity comprises an elongate cross-section parallel to the cavity entrance.
2. The lighting device of claim 1 , wherein each surface section extends between a first edge proximal to the entrance and a second edge distal to the entrance, and has an inflection-free profile in between the first edge and the second edge.
3. The lighting device of claim 1 , wherein each segment further comprises a further region in between the narrowing region and the entrance, the further region delimited by a further portion of the surface section delimiting said segment.
4. The lighting device of claim 3 , wherein at least some of the further portions linearly extend in a direction from the entrance to the narrowing portion of the segment comprising the linearly extending further portion.
5. The lighting device of claim 1 , wherein the elongate cross-section comprises rounded end regions interconnected by inwardly curving adjoining regions or planar adjoining.
6. The lighting device of claim 1 , wherein the lens body comprises a dome-shaped outer surface.
7. The lighting device of claim 6 , wherein the outer surface is a smooth surface or a faceted surface.
8. The lighting device of claim 1 , wherein the plurality of solid state lighting elements are mounted in spatially separated sets along the length of the elongate carrier.
9. The lighting device of claim 8 , wherein at least two of the sets are adapted to emit light of different spectral composition with respect to each other.
10. The lighting device of claim 8 , wherein at least one set is mounted on the elongate carrier such that it aligns with a curved portion of one of the surface sections.
11. The lighting device of claim 1 , wherein the elongate carrier comprises at least two elongate mounting surfaces carrying the solid state lighting elements.
12. The lighting device of claim 1 , wherein the elongate carrier comprises at least one printed circuit board; wherein the solid state lighting elements are surface-mounted on the at least one printed circuit board.
13. The lighting device of claim 1 , wherein the lighting device is a capsule light bulb.
14. A luminaire comprising the lighting device according to claim 1 .