Illumination apparatus with phosphor wheel
AssigneeOSRAM GmbH
InventorOliver Mehl
Life of this patent
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Abstract
Various embodiments propose an illumination apparatus having a laser apparatus and a phosphor wheel, wherein the phosphor wheel has, in addition to at least one phosphor region for phosphor conversion, at least one transmission region for colored light having a second, greater dominance wavelength from a light source. The beam paths from light source and laser apparatus are e.g. arranged collinearly, wherein the phosphor wheel rotates into the common optical axis of the laser apparatus and light source. By adding colored light having a greater dominance wavelength, the dominance wavelength of a colored light channel that is required for projection applications can also be obtained with colored light converted using efficient phosphor having a dominance wavelength that is too small.
Claims20
An illumination apparatus, comprising:
- a phosphor wheel comprising a first side and a second side, wherein the first side has a phosphor region, and wherein the phosphor wheel has a transmission region;
- a laser apparatus for irradiating at least part of the phosphor region on the first side of the phosphor wheel with laser radiation;
- wherein the phosphor region has a phosphor which can be irradiated by the laser radiation and re-emits said laser radiation, at least partially wavelength-converted to colored light having a first dominance wavelength;
- a light source for irradiating the transmission region with colored light having a second dominance wavelength, and
- wherein the second dominance wavelength is greater than the first dominance wavelength.
A method for operating an illumination apparatus,
- the illumination apparatus comprising:
- a phosphor wheel comprising a first side and a second side, wherein the first side has a phosphor region, and wherein the phosphor wheel has a transparent region;
- a laser apparatus for irradiating at least part of the phosphor region on the first side of the phosphor wheel with laser radiation;
- wherein the phosphor region has a phosphor which can be irradiated by the laser radiation and re-emits said laser radiation, at least partially wavelength-converted to colored light having a first dominance wavelength;
- a light source for irradiating the transparent region with colored light having a second dominance wavelength, and
- wherein the second dominance wavelength is greater than the first dominance wavelength;
- the method comprising:
- irradiating the phosphor region with the laser radiation from the laser apparatus for producing colored light having the first dominance wavelength produced using phosphor conversion;
- and
- producing colored light having the second dominance wavelength by operating the light source.
An illumination apparatus, comprising:
- a phosphor wheel comprising a first side and a second side, wherein the first side has a phosphor region, and wherein the phosphor wheel has a transparent region;
- a laser apparatus for irradiating at least part of the phosphor region on the first side of the phosphor wheel with laser radiation;
- wherein the phosphor region has a phosphor which can be irradiated by the laser radiation and re-emits said laser radiation, at least partially wavelength-converted to colored light having a first dominance wavelength;
- a light source for irradiating the transparent region with colored light having a second dominance wavelength, and
- wherein the second dominance wavelength is greater than the first dominance wavelength.
Dependencies are inferred from the claim text.