LIGHTING ARRANGEMENT

• US 20160018066A1
• Filed: 07/18/2014
• Published: 01/21/2016
• Est. Priority Date: 07/18/2014
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Intel Corporation
• Inventors: ABEL, Nicolas, KILCHER, Lucio
• Granted Patent: US 10,471,467 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B05D 5/06 to obtain multicolour or other optical effects B05D5/02 takes precedence
• CPC Class Codes: B29C 59/02 by mechanical means, e.g. pressing B29C59/007 takes precedence; embossing expanded porous articles B29C44/5627
• CPC Class Codes: B29D 11/00336 by making depressions in the lens surfaces
• CPC Class Codes: B29D 11/00605 Production of reflex reflectors
• CPC Class Codes: B29D 11/00865 Applying coatings; tinting; colouring printing, marking or copying processes B41M; identification in general G09F3/00; producing decorative effects in general B44C; positioning or marking of lenses B24B13/0055
• CPC Class Codes: B29L 2011/0083 Reflectors
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• 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 41/337 the reflector having a structured surface, e.g. with facets or corrugations
• CPC Class Codes: F21S 41/37 characterised by their material, surface treatment or coatings
• CPC Class Codes: F21S 41/675 by moving reflectors
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: G03B 2215/0567 Solid-state light source, e.g. LED, laser

Abstract

The present invention concerns a lighting system, which comprises: a laser light source for radiating light; a wavelength conversion element for receiving the radiated light from the light source and for re-emitting wavelength converted white light; and a reflector element for reflecting the light received from the wavelength conversion element. The reflector element comprises a reflective surface and a micro-patterned surface comprising an array of micro-focal elements. Each of said micro-focal elements is configured to converge or diverge incident light from the wavelength conversion element.

Claims

1. A laser based lighting system comprising:

a laser light source for radiating light;

a scanning mirror arrangement, arranged to be rotatable around two substantially orthogonal axes, for receiving the light radiated by the light source, and for reflecting the received light to a wavelength conversion element;

the wavelength conversion element for receiving the light reflected by the scanning mirror arrangement and for re-emitting multi-spectral light;

a reflector element for reflecting the light received from the wavelength conversion element towards an exit aperture of the lighting system, wherein the reflector element comprises a reflective surface and a micro-patterned surface comprising an array of micro-focal elements, said micro-focal elements being configured to converge or diverge incident light from the wavelength conversion element.

2. A lighting system according to claim 1, wherein the light source is located on a first side of the wavelength conversion element, where the reflected light is arranged to exit the lighting system, and the reflector element is located on a second side of the wavelength conversion element, the second side being opposite to the first side.

3. A lighting system according to claim 1, wherein the micro-focal elements are microlenses or micro-reflectors.

4. A lighting system according to claim 1, wherein the micro-focal elements have a maximum dimension between 1 micrometers and 5 millimetres.

5. A lighting system according to claim 1, wherein the array comprises between 10 000 and 2 250 000 micro-focal elements.

6. A lighting system according to claim 1, wherein the array comprises micro-focal elements of at least two different types.

7. A lighting system according to claim 6, wherein one type of micro-focal element is defined by its focal length, shape and/or size.

8. A lighting system according to claim 1, wherein at least one of the micro-focal elements has a spherical shape.

9. A lighting system according to claim 1, wherein at least one of the micro-focal elements has a cylindrical shape.

10. A lighting system according to claim 1, wherein at least one of the micro-focal elements has an aspherical shape.

11. A lighting system according to claim 1, wherein the array has a convex shape.

12. A lighting system according to claim 1, wherein the array has a concave shape.

13. A lighting system according to claim 12, further comprising a transparent layer located between the reflective surface and the micro-patterned surface.

14. A lighting system according to claim 1, wherein the light reflected from the reflector element is arranged to pass through the wavelength conversion element towards the exit aperture.

15. A lighting system according to claim 1, wherein the reflector element is oriented so that the light reflected from the reflector element exits the lighting system without being further reflected.

16. A lighting system according to claim 1, wherein the wavelength conversion element comprises a phosphorous layer.

17. An illumination method for a lighting system comprising:

a laser light source radiating light to a scanning mirror arrangement arranged to be rotatable around two substantially orthogonal axes;

the scanning mirror arrangement reflecting the light received from the laser light source to a wavelength conversion element;

the wavelength conversion element re-emitting broad-spectral light;

a reflector element reflecting the light from the wavelength conversion element towards an exit aperture of the lighting system, wherein the reflector element comprises a reflective surface and a micro-patterned surface comprising an array of micro-focal elements, said micro-focal elements being configured to converge or diverge incident light from the wavelength conversion element.

18. A method of manufacturing a reflector element for a lighting system, the method comprising:

patterning a transparent substrate with a shaped mask by hot embossing, stamping or under pressure to create a micro-patterned surface;

curing the substrate comprising the micro-patterned surface; and

depositing a reflective layer on to the substrate to create the reflector element.

19. A method according to claim 18, further comprising depositing a phosphorous layer on to the reflector element.

20. A method according to claim 18, wherein the mask is on a roller, and the patterning is done by rotating the roller around its rotational axis while pushing the substrate against the roller and moving the substrate to allow various areas of the substrate to be patterned.