Projection lamp for illumination

Patent metadata

Field	Value
Publication number	US-2017334338-A1
Application number	US-201715497251-A
Country	US
Kind code	A1
Filing date	Apr 26, 2017
Priority date	May 19, 2016
Publication date	Nov 23, 2017
Grant date	—

Abstract

A projection lamp for illumination includes a pump radiation unit configured to emit pump radiation, a phosphor element for the at least partial conversion of the pump radiation into a conversion light, and a micromirror array having a multiplicity of micromirror actuators which are arranged in the form of a matrix. The projection lamp is set up such that, during operation, the phosphor element is irradiated by the pump radiation from the pump radiation unit. The conversion light which is thereupon emitted by the phosphor element at least partially makes up an illumination light, which illumination light is guided for adjusting a light distribution over the micromirror actuators. The micromirror actuators are illuminated inhomogeneously with the illumination light at respective times to support the light distribution that is adjusted using the micromirror array.

First claim

What is claimed is:

1 . A projection lamp for illumination, comprising:
a pump radiation unit configured to emit pump radiation; a phosphor element for the at least partial conversion of the pump radiation into a conversion light; a micromirror array having a multiplicity of micromirror actuators which are arranged in the form of a matrix; wherein the projection lamp is set up such that, during operation, the phosphor element is irradiated by the pump radiation from the pump radiation unit, wherein the conversion light which is thereupon emitted by the phosphor element at least partially makes up an illumination light, which illumination light is guided for adjusting a light distribution over the micromirror actuators, wherein the micromirror actuators are illuminated inhomogeneously with the illumination light at respective times to support the light distribution that is adjusted using the micromirror array.

2 . The projection lamp of claim 1 ,
wherein the illumination light is guided only over some of the micromirror actuators in the respective time points, that is to say others of the micromirror actuators are unilluminated, which at least supports the inhomogeneous illumination of the micromirror actuators.

3 . The projection lamp of claim 1 ,
wherein at the respective time points, a first plurality of the micromirror actuators is illuminated with a first part of the illumination light and a second plurality of the micromirror actuators is illuminated with a second part of the illumination light, wherein the first and the second part of the illumination light have different spectral compositions, which at least supports the inhomogeneous illumination of the micromirror actuators.

4 . The projection lamp of claim 1 ,
wherein at the respective time points, a first plurality of the micromirror actuators is illuminated with a first part of the illumination light that, on the micromirror array, has a first irradiance, and a second plurality of the micromirror actuators is illuminated with a second part of the illumination light that, on the micromirror array, has a second irradiance, wherein the first and the second irradiance differ, which at least supports the inhomogeneous illumination of the micromirror actuators.

5 . The projection lamp of claim 1 ,
wherein the pump radiation strikes a surface of incidence of the phosphor element and generates an inhomogeneous irradiance distribution on the surface of incidence, which at least supports the inhomogeneous illumination of the micromirror actuators.

6 . The projection lamp of claim 1 ,
wherein the pump radiation unit has a plurality of pump radiation sources, wherein at the respective time points, a first one of the pump radiation sources emits a first part of the pump radiation with a first radiation density, and a second one of the pump radiation sources emits a second part of the pump radiation with a second radiation density, wherein the first and the second radiation densities differ, which at least supports the inhomogeneous illumination of the micromirror actuators.

7 . The projection lamp of claim 6 ,
wherein the first and the second pump radiation sources are of identical design, but are operated at the respective time points with different output power.

8 . The projection lamp of claim 1 ,
wherein at least one of the pump radiation passes through a filter upstream of the phosphor element or the illumination light passes through a filter downstream of the phosphor element, which at least supports the inhomogeneous illumination of the micromirror actuators.

9 . The projection lamp of claim 1 ,
wherein at least one of the pump radiation is delimited by a stop upstream of the phosphor element or the illumination light is delimited by a stop downstream of the phosphor element, i.e. a beam cross section of the respective beam is reduced, which at least supports the inhomogeneous illumination of the micromirror actuators.

10 . The projection lamp of claim 1 ,
wherein the phosphor element has, with respect to a lateral direction that is at an angle to a pump radiation direction of irradiation, a first region and a second region that differs from the first, wherein the first region and the second region differ in terms of their conversion properties, which at least supports the inhomogeneous illumination of the micromirror actuators.

11 . The projection lamp of claim 10 ,
wherein the same phosphor is provided and/or the same scattering particles are provided in the first region and the second region, but at least one of the effective concentration of the phosphor differs in the first region and the second region or the effective concentration of the scattering particles differs in the first region and the second region.

12 . The projection lamp of claim 1 ,
wherein the phosphor element has a gradient region, wherein the conversion properties vary along a lateral direction, which is at an angle to the pump radiation direction of irradiation, with a gradient, which at least supports the inhomogeneous illumination of the micromirror actuators.

13 . The projection lamp of claim 12 ,
wherein the gradient region extends circumferentially about an axis that is perpendicular to the lateral direction, and the conversion properties in the gradient region vary along the directions that are radial with respect to said axis with a gradient.

14 . The projection lamp of claim 12 ,
wherein the change in conversion properties is achieved by way of a varying effective concentration of a phosphor.

15 . The projection lamp of claim 1 ,
wherein the phosphor element is displaceably mounted such that the conversion properties of the phosphor element in a first displacement position with respect to the pump radiation unit differ from those in a second displacement position with respect to the pump radiation source.

Assignees

• Osram Gmbh

Inventors

• Schoemer Ricarda
• Hager Juergen
• Schwaiger Stephan
• Hering Oliver
• Haas Norbert

Classifications

• F21S41/176

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title

• F21V17/02

  with provision for adjustment (F21V17/04 - F21V17/08 take precedence) · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V14/04

  by movement of reflectors {(in vehicle head lamps F21S41/675)} · CPC title

• F21S41/686

  Blades, i.e. screens moving in a vertical plane · CPC title