Lighting device and method for generating light by means of a wavelength conversion arrangement and a band-stop filter, and method for providing a band-stop filter
First Claim
1. A lighting device for generating light by means of wavelength conversion arrangement, comprising:
- an excitation radiation source, which is designed to emit excitation radiation, and a wavelength conversion arrangement, which comprises at least one first wavelength conversion element and one second wavelength conversion element, which wavelength conversion arrangement is arranged in such a way that excitation radiation emitted by the excitation radiation source can be radiated at least indirectly onto the first wavelength conversion element and onto the second wavelength conversion element,wherein the first wavelength conversion element is designed to convert excitation radiation into light having a first spectrum and a first dominant wavelength, andwherein the second wavelength conversion element is designed to convert excitation radiation into light having a second spectrum and a second dominant wavelength, wherein the second dominant wavelength is longer than the first dominant wavelength,characterized in thatthe lighting device furthermore comprises at least one band-stop filter arranged in such a way that light emitted by the first wavelength conversion element and the second wavelength conversion element can be radiated at least partly and at least indirectly onto the band-stop filter,wherein the band-stop filter is designed to filter the light emitted by the wavelength conversion elements and radiated onto the band-stop filter in such a way that the first dominant wavelength is shortened and the second dominant wavelength is lengthened.
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Accused Products
Abstract
The invention proposes a lighting device (1) comprising a wavelength conversion arrangement (12) and a static band-stop filter (14). The wavelength conversion arrangement (12) comprises two wavelength conversion elements, which can be excited to emit conversion light by means of excitation radiation emitted by an excitation source (2). In order to increase the color space which is addressable by means of the two wavelength conversion elements, with the aid of the band-stop filter (14) the shorter dominant wavelength of the conversion light of both wavelength conversion elements is shortened and the longer dominant wavelength is lengthened. For this purpose, the peak wavelength of the band-stop filter (14) is chosen such that it lies between the two dominant wavelengths of the conversion light emitted by the two wavelength conversion elements. The use of a static band-stop filter (14) designed in this way makes it possible to dispense with separate filter elements for each wavelength conversion element. If the wavelength conversion arrangement is designed as a phosphor wheel (12), in particular a separate filter wheel to be synchronized with the phosphor wheel can be dispensed with.
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Citations
20 Claims
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1. A lighting device for generating light by means of wavelength conversion arrangement, comprising:
an excitation radiation source, which is designed to emit excitation radiation, and a wavelength conversion arrangement, which comprises at least one first wavelength conversion element and one second wavelength conversion element, which wavelength conversion arrangement is arranged in such a way that excitation radiation emitted by the excitation radiation source can be radiated at least indirectly onto the first wavelength conversion element and onto the second wavelength conversion element, wherein the first wavelength conversion element is designed to convert excitation radiation into light having a first spectrum and a first dominant wavelength, and wherein the second wavelength conversion element is designed to convert excitation radiation into light having a second spectrum and a second dominant wavelength, wherein the second dominant wavelength is longer than the first dominant wavelength, characterized in that the lighting device furthermore comprises at least one band-stop filter arranged in such a way that light emitted by the first wavelength conversion element and the second wavelength conversion element can be radiated at least partly and at least indirectly onto the band-stop filter, wherein the band-stop filter is designed to filter the light emitted by the wavelength conversion elements and radiated onto the band-stop filter in such a way that the first dominant wavelength is shortened and the second dominant wavelength is lengthened. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for generating light by means of a wavelength conversion arrangement, which comprises at least two wavelength conversion elements, comprising the following method steps:
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providing a first wavelength conversion element, which, upon absorbing excitation radiation, converts the latter into light having a first spectrum and a first dominant wavelength, providing a second wavelength conversion element, which, upon absorbing excitation radiation, converts the latter into light having a second spectrum and a second dominant wavelength, wherein the first dominant wavelength is shorter than the second dominant wavelength, radiating excitation radiation onto the first wavelength conversion element, radiating excitation radiation onto the second wavelength conversion element, characterized by the following further method step; providing a band-stop filter, which filters the light converted by the wavelength conversion elements in such a way that the first dominant wavelength is shortened and the second dominant wavelength is lengthened.
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12. The method as claimed 11 comprising the following method step:
selecting the peak wavelength and the FWHM filter width of the band-stop filter in such a way that the band-stop filter reduces the dominant wavelength of the wavelength-converted light having the first spectrum and increases the dominant wavelength of the wavelength-converted light having the second spectrum. - View Dependent Claims (13, 14)
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15. A lighting device for generating light by means of wavelength conversion arrangement, comprising:
an excitation radiation source, which is designed to emit excitation radiation, and a wavelength conversion arrangement, which comprises at least one first wavelength conversion element and one second wavelength conversion element, which wavelength conversion arrangement is arranged in such a way that excitation radiation emitted by the excitation radiation source can be radiated at least indirectly onto the first wavelength conversion element and onto the second wavelength conversion element, wherein the first wavelength conversion element is designed to convert excitation radiation into light having a first spectrum and a first dominant wavelength, wherein the first wavelength conversion element is designed in such a way that the first dominant wavelength is in a green or yellow-green spectral range, and wherein the second wavelength conversion element is designed to convert excitation radiation into light having a second spectrum and a second dominant wavelength, wherein the second dominant wavelength is longer than the first dominant wavelength, wherein the second wavelength conversion element is designed in such a way that the second dominant wavelength is in a red or yellow-red spectral range, characterized in that the lighting device furthermore comprises at least one band-stop filter arranged in such a way that light emitted by the first wavelength conversion element and the second wavelength conversion element can be radiated at least partly and at least indirectly onto the band-stop filter, wherein the band-stop filter is designed to filter the light emitted by the wavelength conversion elements and radiated onto the band-stop filter in such a way that the first dominant wavelength is shortened and the second dominant wavelength is lengthened. - View Dependent Claims (16, 17, 18, 19, 20)
Specification