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Quartz metal halide lamps with high lumen output

A metal halide, light output technology, applied in the direction of discharge lamps, gas discharge lamps, parts of gas discharge lamps, etc., can solve the problems of not improving the light output, etc., to improve lamp efficiency, reduce energy loss, and heat conduction loss Reduced effect

Inactive Publication Date: 2004-02-11
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solutions use nitrogen-filled lamps, which do not improve the light output to the lamp

Method used

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  • Quartz metal halide lamps with high lumen output
  • Quartz metal halide lamps with high lumen output
  • Quartz metal halide lamps with high lumen output

Examples

Experimental program
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Embodiment Construction

[0016] According to the present invention, referring to figure 1 , mark 1 denotes a quartz glass discharge vessel or arc tube filled with a filling including mercury; sodium halide; and one or more metals such as scandium, cesium, calcium, zinc, cadmium, and an inert gas such as argon , barium, mercury, gallium, indium, thallium, germanium, tin, thorium, selenium and tellurium and other halides. In general, iodides of these metals are preferred, although bromides and in some cases chlorides can also be used. The arc tube may contain one or more of sodium iodide, sodium bromide or sodium chloride, all of which are known in the art. According to the present invention, including silicon nitride (Si 3 N 4 ) coating 14 is deposited on the outer surface of the arc tube 1, preferably by chemical vapor deposition (CVD) before the lamp components are assembled into the lamp. Preferably, the arc tube is coated with about 30 nanometers to 200 nanometers of silicon nitride.

[0017] ...

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Abstract

High lumen output quartz metal halide lamps are provided which comprise a vacuum outer fill, and a silicon nitride CVD coating on the outside of the quartz arc tubes (discharge tubes). Instead of nitrogen filled outers, vacuum lamp outers are used to reduce energy loss (since heat conduction loss is reduced) and to increase lumen output. Additionally, only the outside of the arc tubes is coated with silicon nitride, without coating the metal components. This reduces or blocks sodium diffusion through the quartz walls. The silicon nitride coating also retards migration of the trace hydrogen from the lamp outer into the arc tube. At least about a 10% increase, and preferably a 15% increase in lumen output is realized by using a vacuum lamp outer instead of the nitrogen fill outer conventionally used for the traditional quartz fill lamps. The heat conduction loss is reduced and the lamp efficiency is increased significantly.

Description

technical field [0001] The present invention relates to an improved metal halide lamp. Background technique [0002] Conventional metal halide lamps contain an electric light source comprising an arc tube made of a vitreous material such as quartz or high temperature glass, usually centrally disposed within a vitreous outer envelope and supported by a metal frame. The outer envelope typically has at least one end thereof a stem-like or neck-like portion terminating in a generally metallic base. An arc discharge tube or "arc tube" housed within the enclosure is connected to the metal base by a current supply conductor. The arc tube contains electrodes disposed at each end, and contains a fill comprising mercury; sodium halide; and one or more metals such as scandium, cesium, calcium, zinc, cadmium, barium, mercury, gallium, indium, Halides of thallium, germanium, tin, thorium, selenium and tellurium, etc. The arc tube also typically contains an inert gas such as argon. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/34H01J61/35H01J61/82
CPCH01J61/35H01J61/827
Inventor J·-M·涂K·S·多姆布洛夫斯基
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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