UHP-Reflector with integrated cooling construction
Publication Date: 2004-Nov-10
The IP.com Prior Art Database
UHP-Reflector with integrated cooling construction.
Due to the increasing miniaturization and wall-load of projection lamps (e.g. UHP- lamps), the problem occurs that lamp vessels of said lamps become too hot and the need for cooling of said lamp vessel arises. Studies have shown that cooling of the lamp vessel with two tubes that extend over the sealed portions of the lamp vessel give the best results.
The invention relates to a reflector which is provided with means for cooling of the lamp vessel accommodated in the reflector. The general idea for the mechanical construction of said reflector is shown in the figure.
Cooling of the lamp vessel is attained by flowing air along the sealed portions of the lamp vessel, the air being provided to the lamp vessel via cooling tubes that extend over the sealed portions of the lamp vessel. The first cooling tube extends over the first sealed portion of the lamp, from the neck of the reflector to the discharge space of the lamp vessel. Constructions for cooling via the neck of the reflector are well- known in the art. The second cooling tube extends over the second sealed portion of the lamp vessel, from the first lid in the light emission window to the discharge space of the lamp vessel. The second cooling tube is fixed (e.g. melted or cemented) onto the first lid and exactly over an opening in the first lid. (in order to counteract too much thermal stress between the lid and the cooling tube, which may be made of different glass types e.g. hard glass and quartz glass respectively, the fixing of the cooling tube to the lid may be don...