Discharge lamp having cooling means

Abstract

A discharge lamp, and particularly a high-pressure gas-discharge lamp (an HID (high-intensity discharge) lamp or UHP (ultra-high performance) lamp), having a reflector and a cooling means is described. The cooling means comprises at least one nozzle ( 3 ) by which a flow of gas can be directed onto the discharge lamp, the at least one nozzle ( 3 ) being so arranged that it does not extend, at least to any substantial degree, into a beam path produced by the lamp ( 2 ) and the reflector ( 1 ). In this way, the cooling means does not produce any obstacles on the beam path for the light. With preferred embodiments, it is possible to produce a turbulent flow that surrounds particularly the discharge vessel ( 21 ) of the lamp and that considerably increases the effectiveness of the cooling means. Further embodiments also allow the discharge lamp to be operated in a plurality of different positions without individual regions of the lamp being too little or too severely cooled.

Description

technical field [0001] The invention relates to a discharge lamp, in particular to a high-pressure gas discharge lamp (HID lamp (High Intensity Discharge Lamp) or UHP lamp (Ultra High Performance Lamp)) with a reflector and a cooling device. [0002] Discharge lamps can withstand relatively high levels of thermal stress, depending on the size of the discharge lamp, the state of installation, and its operating power. In order to avoid any shortening of the life of the discharge lamp due to thermal stress and / or further increasing its power, cooling means are used in many cases. Background technique [0003] Known, for example, from US Pat. No. 3,843,879 is a discharge lamp which is fitted by means of one of its electrode seals (extrusions) into the radial portion of the reflector. In this case, the cooling device is essentially formed by a sleeve structure connected to a source of compressed air and mounted on the other electrode seal of the lamp, through which air flows tow...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this cooling device is that the construction of the sleeve and the ducts required for the supply of compressed air adversely affect the optical properties of the lamp, since the light is screened out or the polar diagram of the light distribution is altered

[0004] In addition, when the lamp is not operating in its required operating position, the cooling device or other cooling devices may cause problems, because on the one hand any change in this position also means that the hottest area of ​​the lamp is shifted to different points and may thus be insufficiently cooled, in which case there is a risk of recrystallization of the quartz of the lamp envelope

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