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

• Main Author: Mehl Oliver
• Format: Patent
• Language: English
• Published: 06.02.2018
• Subjects: BLASTING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; LIGHTING; MECHANICAL ENGINEERING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; WEAPONS

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.