Internally cooled fluorescent device and reflector lamp arrangement including said fluorescent device
A dual fluorescent wheel with two disk-shaped carrier elements which are interconnected by wing-type cooling ribs is disclosed. When the dual fluorescent wheel rotates, air flows in through an axial opening in one of the carrier elements, the air flows radially through the interspace between the carrier elements or the wing-type cooling ribs and flows out at the edge. This airflow improves the dissipation of heat which is produced when an excitation laser irradiates the annular fluorescent strips located on the two exterior faces.
1. A reflector lamp arrangement comprising
at least one reflector,
at least one excitation laser which is designed for the emission of an excitation-laser radiation, and
an internally cooled fluorescent device, comprising
two disk-like carrier elements having two sides each which are arranged at a mutual distance in such a manner that one side of one carrier element faces one side of the other carrier element and as a result define two inside surfaces, facing one another, of the fluorescent device, the respective other two sides of the two carrier elements pointing toward the outside and thus defining two outside surfaces of the fluorescent device,
at least one conversion area which contains a luminous material and is arranged on at least one of the two outside surfaces, and
at least one opening which is arranged in at least one of the two carrier elements;
wherein the reflector lamp arrangement is designed for the excitation-laser radiation to impinge on the at least one conversion area of the fluorescent device, to be wavelength-converted by the luminous material of the at least one conversion area and at least a part of the wavelength-converted light to impinge on the at least one reflector.
2. The reflector lamp arrangement as claimed in claim 1 , which is designed for at least a part of the excitation-laser radiation to impinge at least temporarily also on the at least one scattering area of the fluorescent device, to be reflectively scattered by its reflectively scattering surface and at least a part of the reflectively scattered light to impinge on the at least one reflector.
3. The reflector lamp arrangement as claimed in claim 1 , which is designed for at least one of the two disk-like carrier elements to rotate and a cooling medium to enter through the at least one opening in one of the carrier elements, flow through the internal space between the inside surfaces of the two disk-like carrier elements and leave at its edge area.
4. The reflector lamp arrangement as claimed in claim 3 , wherein the cooling ribs, extending essentially radially in the interspace between the inside surfaces of the two disk-like carrier elements, are bent in opposition to the direction of rotation of the fluorescent device.
5. The reflector lamp arrangement as claimed in claim 3 , wherein the cooling medium is a component of a closed cooling circuit.
6. The reflector lamp arrangement as claimed in claim 1 , which is designed in such a manner that the at least one reflector has at least one focal point and that at least a part of the at least one conversion area rotates through the at least one focal point.
7. The reflector lamp arrangement as claimed in claim 1 , wherein both outside surfaces of the two carrier elements of the fluorescent device are provided with a conversion area and wherein the reflector comprises two half-shell reflectors having in each case one focal point, wherein the reflector lamp arrangement is designed in such a manner that each of the two conversion areas rotates through one focal point of a half-shell reflector.
8. The reflector lamp arrangement as claimed in claim 7 , which is designed in such a manner that both half-shell reflectors in each case have a primary and a secondary focal point, wherein the conversion areas on the two outside surfaces of the carrier elements rotate through the respective primary focal points and the two secondary focal points coincide to form a common focal point.