Method for operating an illuminating device

Patent metadata

Field	Value
Publication number	US-9958669-B2
Application number	US-201515308850-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	May 6, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Various embodiments may relate to a method for operating an illuminating device with a pump radiation source for emitting pump radiation, and a phosphor wheel, on which a first phosphor for emitting first conversion light and a second phosphor for emitting second conversion light are provided, in which method the phosphor wheel rotates about a rotation axis and in the process is irradiated with the pump radiation in an irradiation region eccentrically with respect to the rotation axis in such a way that a circular track is irradiated owing to the rotation of the phosphor wheel, wherein during a 360° revolution of the phosphor wheel the first phosphor is irradiated with a first pump radiation power and the second phosphor is irradiated with a second pump radiation power, which is different than the first pump radiation power.

First claim

The invention claimed is:

1. A method for operating an illuminating device comprising
a pump radiation source for emitting pump radiation, and
a phosphor wheel, on which a first phosphor for emitting first conversion light and a second phosphor for emitting second conversion light are provided,
wherein the first phosphor and the second phosphor are arranged in a manner spatially separated from one another on the phosphor wheel,
and wherein a first useful light based on the first conversion light and a second useful light based on the second conversion light have the same color, but a different color locus in the CIE standard colorimetric system,
in which method the phosphor wheel rotates about a rotation axis and in the process is irradiated with the pump radiation in an irradiation region eccentrically with respect to the rotation axis in such a way that a circular track is irradiated owing to the rotation of the phosphor wheel,
wherein during a 360° revolution of the phosphor wheel the first phosphor is irradiated with a first pump radiation power and the second phosphor is irradiated with a second pump radiation power, which is different than the first pump radiation power.

2. The method as claimed in claim 1 , wherein this variation between the first pump radiation power and the second pump radiation power is repeated over a first multiplicity of successive 360° revolutions and the first phosphor and the second phosphor are irradiated with the same pump radiation power during a second multiplicity of successive 360° revolutions of the phosphor wheel that follow the first multiplicity of 360° revolutions.

3. The method as claimed in claim 1 , wherein the first useful light is provided by filtering the first conversion light and/or the second useful light is provided by filtering the second conversion light.

4. The method as claimed in claim 3 , wherein the first phosphor and the second phosphor are the same phosphor and the different color locus is set solely by the filtering.

5. The method as claimed in claim 1 , wherein the first useful light is provided with a first luminous efficiency and the second useful light is provided with a second luminous efficiency, wherein the first luminous efficiency is at least 20% greater than the second luminous efficiency.

6. The method as claimed in claim 1 , wherein the same color is red or green.

7. The method as claimed in claim 6 , wherein the first useful light has a first dominant wavelength and the second useful light has a second dominant wavelength, wherein in the case of red the second dominant wavelength is greater than the first dominant wavelength and in the case of green the second dominant wavelength is less than the first dominant wavelength.

8. The method as claimed in claim 1 , wherein the first useful light has a first color locus and the second useful light has a second color locus, wherein at least a third useful light having a third color locus and a fourth useful light having a fourth color locus are additionally provided, which third and fourth color loci together with respectively the first or the second color locus span at least one three-color RGB color gamut, wherein the two color gamuts differ by at least 5% in their area in the CIE standard colorimetric system.

9. The method as claimed in claim 1 , wherein the color of the first and of the second useful light is green, that is to say that this useful light is based on a green first phosphor and a green second phosphor, wherein furthermore red first useful light and red second useful light is provided, which differs in the color locus but has the same color green, for which purpose a red first phosphor and a red second phosphor are additionally arranged in a manner spatially separated from one another on the phosphor wheel.

10. The method as claimed in claim 9 , wherein during a 360° revolution of the phosphor wheel the green first phosphor is irradiated with a green first pump radiation power and the green second phosphor is irradiated with a green second pump radiation power, which is different than the green first pump radiation power, and during the same 360° revolution the red first phosphor is irradiated with a red first pump radiation power and the red second phosphor is irradiated with a red second pump radiation power, which is different than the green first pump radiation power, wherein this variation between the pump radiation powers is furthermore repeated over the first multiplicity of successive 360° revolutions.

11. An illuminating device comprising
a pump radiation source for emitting pump radiation,
a phosphor wheel, on which a first phosphor for emitting first conversion light and a second phosphor for emitting second conversion light are provided, and
a control unit for controlling the pump radiation source,
wherein the first and the second phosphor are arranged in a manner spatially separated from one another on the phosphor wheel,
and wherein a first useful light based on the first conversion light and a second useful light based on the second conversion light have the same color, but a different color locus in the CIE standard colorimetric system,
and wherein the control unit is furthermore configured for a method in which the phosphor wheel rotates about a rotation axis and in the process is irradiated with the pump radiation in an irradiation region eccentrically with respect to the rotation axis in such a way that a circular track is irradiated owing to the rotation of the phosphor wheel,
wherein during a 360° revolution of the phosphor wheel the first phosphor is irradiated with a first pump radiation power and the second phosphor is irradiated with a second pump radiation power, which is different than the first pump radiation power.

Assignees

• Osram Gmbh

Inventors

• Mehl Oliver

Classifications

• G03B33/08

  Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) · CPC title

• H05B47/16

  by timing means · CPC title

• G03B21/204 Primary

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · CPC title

• G02B26/008 Primary

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• H05B37/0281

  Electricity · mapped topic