Luminaire with multiple light emissive surfaces

Abstract

A luminaire comprising a housing having a first main face opposite a second main face at a distance W. The first main face comprises a light exit window transmissive for light source light, is bordered by at least one sidewall connecting the first and second main face, and has a length L. The sidewall comprises essentially over its full length L a light emission window which is transmissive for light source light and which has a height H, with H in between 0.1*W to 0.8*W.

Claims

1. A luminaire comprising a housing with a first main face opposite a second main face at a distance W and being configured to accommodate a plurality of light sources for generating light source light; the first main face comprising a light exit window transmissive for light source light and being bordered about its periphery by at least one sidewall, the at least one sidewall having at least one corresponding length L and transversely extending from the first main face, and an edge bordering the first main face; wherein the at least one sidewall comprises essentially over its full length L a light emission window transmissive for light source light and which has a height H, with H in between 0.1*W to 0.8*W, and wherein the light exit window is associated with a first light source of the plurality of light sources having a first main issue direction of light oriented toward the light exit window and each of the light emission windows is associated with a second light source of the plurality of light sources having at least one second main issue direction of light oriented toward the light emission windows; wherein the luminaire is characterized in that the height H is varied over the periphery of the of the at least one sidewall.

2. The luminaire as claimed in claim 1, wherein the height H is varied between 0.2*W to 0.4*W.

3. The luminaire as claimed in claim 1 wherein the at least one sidewall comprises a second edge and the light emission window extends from its first edge towards its second edge or the light emission window extends from its second edge towards its first edge.

4. The luminaire as claimed in claim 1, wherein the light exit window extends over the whole first main face.

5. The luminaire as claimed in claim 1, wherein a non-light emitting region is comprised in between the light exit window and the light emission window around the periphery of the at least one side wall.

6. The luminaire as claimed in claim 1, wherein the light emission window is formed by a plurality of light transmissive sub-windows.

7. The luminaire as claimed in claim 1, wherein the housing accommodates the plurality of light sources.

8. The luminaire as claimed in claim 1, wherein the first and second light sources are independently controllable.

9. The luminaire as claimed in claim 1, wherein the housing comprises acoustic absorptive material.

10. The luminaire as claimed in claim 1, wherein light source light is issued as a light beam from the light emission window at angles of at the most 65 between the normal to the light exit window and the light beam.

11. A luminaire as claimed in claim 1, wherein the second main face comprises a further light exit window.

12. A luminaire comprising a housing with a first main face opposite a second main face at a distance W and being configured to accommodate a plurality of light sources for generating light source light; the first main face comprising a light exit window transmissive for light source light and being bordered about its periphery by at least one sidewall, the at least one sidewall having at least one corresponding length L and transversely extending from the first main face, and an edge bordering the first main face; wherein the at least one sidewall comprises essentially over its full length L a light emission window transmissive for light source light and which has a height H, with H in between 0.1*W to 0.8*W, and wherein the light exit window is associated with a first light source of the plurality of light sources having a first main issue direction of light oriented toward the light exit window and each of the light emission windows is associated with a second light source of the plurality of light sources having at least one second main issue direction of light oriented toward the light emission, and wherein the at least one sidewall comprises a further light emission window separated from the light emission window by a light blocking band with height HB, HB being in the range of 0.2*W to 0.6*W.

13. The luminaire as claimed in claim 12, wherein the height H is varied between 0.2*W to 0.4*W.

14. The luminaire as claimed in claim 12 wherein the at least one sidewall comprises a second edge and the light emission window extends from its first edge towards its second edge or the light emission window extends from its second edge towards its first edge.

15. The luminaire as claimed in claim 12, wherein the light exit window extends over the whole first main face.

16. The luminaire as claimed in claim 12, wherein a non-light emitting region is comprised in between the light exit window and the light emission window around the periphery of the at least one side wall.

17. The luminaire as claimed in claim 12, wherein the light emission window is formed by a plurality of light transmissive sub-windows.

18. The luminaire as claimed in claim 12, wherein the first and second light sources are independently controllable.

19. The luminaire as claimed in claim 12, wherein light source light is issued as a light beam from the light emission window at angles of at the most 65 between the normal to the light exit window and the light beam.

20. A luminaire as claimed in claim 12, wherein the second main face comprises a further light exit window.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will now be further elucidated by means of the schematic drawings, in which

(2) FIG. 1 shows a perspective view from below of a first embodiment of the luminaire according to the invention;

(3) FIG. 2 shows a perspective view from below of a second embodiment of the luminaire according to the invention;

(4) FIG. 3 shows a partial cross-section in length direction of a third embodiment of a luminaire according to the invention;

(5) FIG. 4 shows a partial cross-section of a fourth embodiment of a luminaire according to the invention;

(6) FIG. 5 shows a partial cross-section of a fifth embodiment of a luminaire according to the invention;

(7) FIG. 6 shows a partial cross-section of a sixth embodiment of a luminaire according to the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

(8) FIG. 1 shows a perspective view from below of a first inventive embodiment of a luminaire 1 having a subtle wave-like curvature and being electrically connected to mains and suspended from a ceiling via suspension cables 3. The luminaire comprises a housing 5 having a first main face 7 opposite a second main face 9 at a distance W and which housing accommodates a light source (not shown) for generating light source light (not shown). The first main face comprises a diffuser as a light exit window 17 which extends over the whole first main face, which is diffusely transmissive for light source light and which is bordered by at least four sidewalls 19a,b,c,d each having a respective length La,b,c,d and transversely extending from the first main face. A respective first edge 21a,b,c,d, of each sidewall borders the first main face. Each sidewall comprises essentially over its full length L a respective light emission window 23a,b,c,d which is transmissive for light source light and which has a height H, with H being about 0.25*W. The light emission windows border with their first edges the light exit window.

(9) FIG. 2 shows a perspective view from below of a second embodiment of a pendant luminaire 1 according to the invention. The luminaire comprises a housing 5 having a first main face 7 opposite a second main face 9 at a distance W and which housing accommodates a light source (not shown) for generating light source light (not shown). The first main face comprises a light exit window 17 and the second main face 9 comprises a further light exit window 25. The sidewall 19 comprises light emission windows 23 and a further light emission window 27 mutually separated by a light blocking band 29 having a height HB of 0.55*W. The further light emission window is formed by a large number, in this case about 25000, of relatively small light transmissive sub-windows 24 embodied as round dots. From relatively large distances these sub-windows merge into one large light emission window and virtually form one light transmissive area, while when being observed form relatively small distances they render the luminaire to have an aesthetic, decorative feature, as shown in the detailed zoom view.

(10) FIG. 3 shows a partial cross-section in length direction of a third embodiment of a luminaire 1 according to the invention. The luminaire has a housing 5 in which a light source 11, i.e. in the figure an array of first Lambertian LED light sources 11a and an array of second Lambertian LED light sources 11b, is accommodated. The luminaire further has a light exit window 17 associated with the array of first light sources and has a light emission window 23 associated with the array of second light sources. The light emission window borders with its first edge 21 the light exit window. Each array of light sources is controlled by a respective controller 15a,b to independently control the intensity/brightness of the associated array of light sources and thus to independently control the luminous flux of light source light 13 to be issued from the light exit window respectively the light emission window. Wiring 31 can be relatively short as the controller can be located close to its associated light source.

(11) FIG. 4 shows a partial cross-section of a fourth embodiment of a luminaire 1 according to the invention similar to the cross section of FIG. 3. The light source 11 is accommodated in the housing 5 and in this embodiment comprises a pair of first elongated fluorescent tubes 11a as a first light source and a pair of second elongated fluorescent tubes 11b as a second light source. The fluorescent tubes 11a and 11b each are provided with a respective reflective coating on a respective side facing away from an associated window to render the fluorescent tubes 11a and 11b to have a main light issuing direction 55 towards the associated window. All the light sources are controlled by a single controller 15 and not independently controllable. The first main face 7 has a light exit window 17 which is surrounded by a circumferential non-light emitting region 33. The sidewall 19 has a light emission window 23 which neither borders neither the first edge 21 nor a second edge 35 of the sidewall, and which has a height H of about 0.5*W.

(12) FIG. 5 shows a partial cross-section of a fifth embodiment of a luminaire 1 according to the invention similar to the cross section of FIG. 3. The housing 5 of the luminaire comprises a box 37 and a lid 39 mutually connected via special connectors 41, for example spacers. In this embodiment the sidewall 19 does not extend over the full distance W between the first 7 and second main face 9, in this embodiment the sidewall extends for about 65% over distance W. The light emission window 23 in the sidewall has height H which is also about 65% of W. The light emission window is provided with a meso-optic refractive structure 43, which however could be any refractive and/or reflective structure, for example a grating, a micro lens optic or Fresnel lens, which redirects light source light 13 in directions at smaller angles than 65 with a normal N to the first main face. The housing not only accommodates the light source 11 but also accommodates acoustic absorptive material 45, rendering the luminaire to have a relatively large thickness (W) of, for example, about 10 to 15 cm.

(13) FIG. 6 shows a partial cross-section of a sixth embodiment of a luminaire 1 according to the invention similar to the cross section of FIG. 3. The luminaire is slightly curved and its sidewall 19 comprises a light emission window 23 which extends from the second edge 35 towards the first edge 21. The light emission window has a variable height Ha,b,c over the circumference of the sidewall and tapers from a central region 47 of the luminaire towards the peripheral region 49 of the luminaire. The light emission window is diffusely transmissive for light source light 13. The first light source 11a is an array of LEDs facing the light exit window and mounted on a PCB 51 and the second light source 11b is an elongated halogen incandescent lamp with a reflector 53 to render the main issue direction 55 of light from the second light source 11b to be towards the light emission window. The light sources 11a and 11b being independently controllable.