Lighting device

Patent metadata

Field	Value
Publication number	US-9291315-B2
Application number	US-201414320669-A
Country	US
Kind code	B2
Filing date	Jul 1, 2014
Priority date	Aug 30, 2013
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

In various embodiments, a lighting device includes at least one laser light source and a light wavelength conversion element. The light wavelength conversion element includes phosphor which is arranged on a surface region of a substrate and is used for wavelength conversion of the light emitted by the at least one laser light source. The light wavelength conversion element has a greater thickness at the edge of the surface region, provided with phosphor, of the substrate than at the surface centroid of the surface region, provided with phosphor, of the substrate. The thickness is respectively measured perpendicularly to the surface region, provided with phosphor, of the substrate.

First claim

What is claimed is:

1. A lighting device, comprising:
at least one laser light source; and
a light wavelength conversion element;
the light wavelength conversion element comprising phosphor which is arranged on a surface region of a substrate and is used for wavelength conversion of the light emitted by the at least one laser light source;
wherein the light wavelength conversion element has a greater thickness at the edge of the surface region, provided with phosphor, of the substrate than at the surface centroid of the surface region, provided with phosphor, of the substrate, the thickness respectively being measured perpendicularly to the surface region, provided with phosphor, of the substrate,
wherein the phosphor has a greater thickness on the substrate at the edge of the surface region, provided with phosphor, of the substrate than at the surface centroid of the surface region, provided with phosphor, of the substrate, and
wherein the concentration of a wavelength conversion means in the phosphor is less at the edge of the surface region, provided with phosphor, of the substrate than at the surface centroid of the surface region, provided with phosphor, of the substrate.

2. The lighting device of claim 1 ,
wherein the substrate provided with phosphor has a greater thickness at the edge of the surface region provided with phosphor than at the surface centroid of the surface region, provided with phosphor, of the substrate.

3. The lighting device of claim 1 ,
wherein the thickness of the phosphor lies in the range from 2 micrometers to 500 micrometers.

4. The lighting device of claim 1 ,
wherein the substrate is formed as a sapphire or ceramic platelet.

5. The lighting device of claim 1 ,
which is formed in such a way that a laser beam directed onto the light wavelength conversion element is generated with a laser spot on a surface of the light wavelength conversion element, the energy density of the laser beam being greater in an edge zone of the laser spot than at the surface centroid of the laser spot.

Assignees

• Osram Gmbh

Inventors

• Sorg Joerg
• Boesl Florian
• Sprenger Dennis

Classifications

• F21Y2115/30

  Semiconductor lasers · CPC title

• F21S41/16

  Laser light sources · CPC title

• A61B1/0653 Primary

  with wavelength conversion · CPC title

• G02B6/0008

  the light being emitted at the end of the fibre · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title