A LIGHT EMITTING DEVICE

• US 20160259116A1
• Filed: 10/23/2014
• Published: 09/08/2016
• Est. Priority Date: 11/05/2013
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Philips Lighting BV (Koninklijke Philips N.V.)
• Inventors: VAN BOMMEL, TIES, HIKMET, RIFAT ATA MUSTAFA
• Granted Patent: US 9,798,070 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/16 Laser light sources
• CPC Class Codes: F21S 41/176 Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
• CPC Class Codes: F21S 41/24 Light guides
• CPC Class Codes: F21S 41/285 Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
• CPC Class Codes: F21S 41/321 the reflector being a surface of revolution or a planar surface, e.g. truncated
• CPC Class Codes: F21S 41/323 the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21W 2121/00 Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: G02B 6/0003 the light guides being doped with fluorescent agents
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0063 for extracting light out both the major surfaces of the light guide
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64

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.

Claims

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.

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

10. 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.

11. 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.

12. A light emitting device according to claim 11, 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.

13. 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.

14. 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.

16. 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.

8. (canceled)

15. (canceled)