Light concentrator module

Patent metadata

Field	Value
Publication number	US-10920939-B2
Application number	US-201816628786-A
Country	US
Kind code	B2
Filing date	Jul 4, 2018
Priority date	Jul 7, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

The invention provides a lighting device ( 1 ) comprising a luminescent element ( 5 ) comprising an elongated light transmissive body ( 100 ), the elongated light transmissive body ( 100 ) comprising a side face ( 140 ), wherein the elongated light transmissive body ( 100 ) comprises a luminescent material ( 120 ) configured to convert at least part of a light source light ( 11 ) selected from one or more of the UV, visible light, and IR received by the elongated light transmissive body ( 100 ) into luminescent material radiation ( 8 ). The invention further provides such luminescent element per se.

First claim

The invention claimed is:

1. A lighting device comprising:
a light source configured to provide light source light selected from one or more of ultraviolet (UV), visible light, and infrared (IR);
a luminescent element comprising an elongated light transmissive body, the elongated light transmissive body comprising a side face, wherein:
the elongated light transmissive body comprises a luminescent material,
the elongated light transmissive body has a length (L);
the elongated light transmissive body is hollow over at least part of the length (L) thereby defining a cavity,
the elongated light transmissive body comprises a radiation input face and a first radiation exit window; wherein the luminescent material is configured to convert at least part of light source light received at the radiation input face into luminescent material radiation, and the luminescent element being configured to couple at least part of the luminescent material radiation out at the first radiation exit window as converter radiation,
the elongated light transmissive body has a first face and a second face defining the length (L) of the elongated light transmissive body; wherein the side face comprises the radiation input face, and wherein:
the second face comprises the radiation exit window.

2. The lighting device according to claim 1 , wherein the elongated light transmissive body has a polygonal cross-section, and wherein the elongated light transmissive body comprises a cavity surrounded by the elongated light transmissive body.

3. The lighting device according to claim 1 , wherein the elongated light transmissive body has a tubular shape having a cavity surrounded by the elongated light transmissive body.

4. The lighting device according to claim 1 , wherein at least part of the cavity comprises a light transmissive material, differing in composition from the composition of the material of the elongated light transmissive body, wherein the light transmissive material in the cavity has an index of refraction equal to or lower than the light transmissive material of the light transmissive body.

5. The lighting device according to claim 1 , wherein one or more of the first face and the second face comprise a plane comprising surface modulations thereby creating different modulation angles relative to the respective plane.

6. The lighting device according to claim 1 , further comprising an optical element optically coupled to the elongated light transmissive body, wherein the elongated light transmissive body and the optical element are a single body.

7. The lighting device according to claim 1 , further comprising an optical element optically coupled to the elongated light transmissive body, wherein the optical element is selected from the group consisting of a compound parabolic concentrator, an adapted compound parabolic concentrator, a dome, a wedge-shaped structure, and a conical structure.

8. The lighting device according to claim 1 , further comprising an optical element optically coupled to the elongated light transmissive body, wherein the optical element comprises a plurality of optical fibers, optically coupled to the elongated light transmissive body.

9. The lighting device according to claim 1 , comprising a plurality of elongated light transmissive bodies, each elongated light transmissive body comprising a luminescent material configured to convert at least part of a light source light selected from one or more of the UV, visible light, and IR received by the elongated light transmissive body into luminescent material radiation, wherein:
the elongated light transmissive bodies differ in one or more of (a) length (L) of the elongated light transmissive bodies, (b) type of luminescent material, (c) concentration of luminescent material, (d) concentration distribution over the elongated light transmissive body, and (e) host matrix for the luminescent material;
each elongated light transmissive body has an axis of elongation (BA);
one or more of the elongated light transmissive bodies comprise cavities;
wherein the elongated light transmissive bodies are configured in a core-shell configuration wherein a smaller elongated light transmissive body is at least partly configured in the cavity of a larger elongated light transmissive body and wherein the axes of elongations (BA) are configured parallel.

10. The lighting device according to claim 9 , wherein the elongated light transmissive bodies have side faces, and wherein side faces of adjacent elongated light transmissive bodies have no physical contact or only over at maximum 10% of their respective surface areas.

11. The lighting device according to claim 9 , further comprising an optical element, wherein the optical element comprises a first wall and a second wall surrounding the first wall thereby defining an optical element having a ring-like cross-section, wherein the optical element comprises a radiation entrance window and a radiation exit window, wherein the radiation entrance window is optically coupled with the plurality of elongated light transmissive bodies.

12. The lighting device according to claim 1 , wherein the first face is facetted or has one or more oblique sides with respect to the side face.

13. The lighting device according to claim 12 , further comprising a reflective surface facing the first face and not being in direct contact with the first face of the elongated light transmissive body.

14. The lighting device according to claim 1 , further comprising a plurality of light sources, wherein (i) one or more light sources are configured to provide light source light to the side face of an outer elongated light transmissive body and/or wherein one or more light sources are configured to provide light source light to one or more first faces, wherein the one or more first faces are end faces, and/or (ii) wherein one or more light sources are configured in a cavity of an inner elongated light transmissive body and configured to provide light source light to the side face of the inner elongated light transmissive body, wherein at least two elongated light transmissive bodies provide luminescent material light with different spectral distributions, and wherein optionally the lighting device comprises a control system, configured to control the spectral distribution of the lighting device light.

15. A lighting system, comprising:
one or more lighting devices according to claim 1 and,
a controller for controlling the one or more lighting devices.

Assignees

• Signify Holding Bv

Inventors

• Haenen Ludovicus Johannes Lambertus
• Hoelen Christoph Gerard August
• De Boer Dirk Kornelis Gerhardus
• Kadijk Simon Eme
• Li Yun

Classifications

• G02B6/023

  having different index layers arranged around the core for guiding light by reflection, i.e. 1D crystal, e.g. omniguide · CPC title

• F21K9/68

  Details of reflectors forming part of the light source · CPC title

• F21Y2103/00

  Elongate light sources, e.g. fluorescent tubes · CPC title

• H05B47/155

  Coordinated control of two or more light sources · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title