Light emitting device

Patent metadata

Field	Value
Publication number	US-9798070-B2
Application number	US-201415031322-A
Country	US
Kind code	B2
Filing date	Oct 23, 2014
Priority date	Nov 5, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

In various embodiments, a light emitting device is provided comprising a plurality of first solid state light sources for emitting first light with a first spectral distribution, and a first light guide comprising a first light input surface, a first end surface extending in an angle with respect to each other and at least one first further surface extending parallel to the first light input surface. The first light guide receiving the first light at the first light input surface, and guiding a part of the first light to the first end surface. The light emitting device further comprises one first optical element, for shaping light that is coupled out of the first light guide through a part of the at least one first further surface such as to provide a first shaped light, and at least one second optical element on the first end surface.

First claim

The invention claimed is:

1. A light emitting device comprising:
a plurality of first solid state light sources adapted for, in operation, emitting first light with a first spectral distribution, and
a first light guide comprising a first light input surface, a first end surface extending in an angle different from zero with respect to each other and at least one first further surface, the plurality of first solid state light sources being arranged at the first light input surface,
the first light guide being adapted for receiving the first light with the first spectral distribution at the first light input surface, and guiding at least a part of the first light with the first spectral distribution to the first end surface,
the light emitting device further comprising at least one first optical element, which is adapted for shaping light that is coupled out of the first light guide through at least a part of the at least one first further surface such as to provide a first shaped light, and at least one second optical element arranged at or on the first end surface.

2. A light emitting device according to claim 1 , wherein the first light guide is adapted to couple at least a part of the first light with the first spectral distribution out of the first end surface and wherein the at least one second optical element is adapted for shaping light that is coupled out of the first light guide through the first end surface such as to provide a second shaped light.

3. A light emitting device according to claim 1 , wherein the second optical element furthermore is adapted for shaping at least a part of the first shaped light.

4. A light emitting device according to claim 1 , wherein the first optical element is adapted for converting at least a part of the first shaped light to light with a third spectral distribution and wherein the at least one second optical element is adapted for converting at least a part of the second shaped light to light with a fourth spectral distribution being different from the third spectral distribution.

5. A light emitting device according to claim 1 , wherein the at least one second optical element is a reflector and wherein the first light guide is adapted to couple at least a part of the first light with the first spectral distribution out of at least a part of the at least one first further surface.

6. A light emitting device according to claim 5 , wherein light out-coupling means are provided on the at least part of the at least one first further surface of the first light guide.

7. A light emitting device according to claim 5 , wherein light out-coupling means are provided in a part of the first light guide.

8. A light emitting device according to claim 1 , wherein the first light guide is transparent.

9. A light emitting device according to claim 1 , further comprising a luminescent element arranged at, in or on the at least one first optical element.

10. A light emitting device according to claim 1 , further comprising:
a plurality of second solid state light sources adapted for, in operation, emitting third light with a fifth spectral distribution, and
a second light guide comprising a second light input surface, a second end surface extending in an angle different from zero with respect to each other and at least one second further surface, the plurality of second solid state light sources being arranged at the second light input surface,
the second light guide being adapted for receiving the third light with the fifth spectral distribution at the second light input surface, guiding at least a part of the third light with the fifth spectral distribution to the second end surface and coupling at least a part of the third light with the fifth spectral distribution out of the second end surface,
at least one fourth optical element which is adapted for shaping light coupled out of the second light guide through at least a part of the at least one second further surface such as to provide a third shaped light, and
at least one fifth optical element arranged at or on the at least one second end surface.

11. A light emitting device according to claim 10 , wherein the at least one fifth optical element is adapted for shaping the third light with the fifth spectral distribution that is coupled out of the second light guide through the at least one second end surface such as to provide a fourth shaped light.

12. A light emitting device according to claim 1 , wherein the at least one first optical element is a first part of a reflector element and the at least one fourth optical element is a second part of the reflector element, the first part and the second part of the reflector element being separated by means of a separation element.

13. A light emitting device according to claim 1 , wherein the second light guide is adapted for converting at least a part of the third light with the fifth spectral distribution to fourth light with a sixth spectral distribution, guiding at least a part of the fourth light with the sixth spectral distribution to the second end surface and coupling at least a part of the fourth light with the sixth spectral distribution out of the second end surface.

14. A light emitting device according to claim 1 , wherein the first light guide is adapted for converting at least a part of the first light with the first spectral distribution to second light with a second spectral distribution, and guiding the second light with the second spectral distribution to the first end surface.

Assignees

• Philips Lighting Holding Bv

Inventors

• Van Bommel Ties
• Hikmet Rifat Ata Mustafa

Classifications

• F21Y2105/00

  Planar light sources · CPC title

• F21W2121/00

  Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00 · CPC title

• F21S41/151

  arranged in one or more lines · CPC title

• G02B6/0063

  for extracting light out both the major surfaces of the light guide · CPC title

• F21V29/505

  of reflectors · CPC title