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Mercury-free high intensity gas-discharge lamp

A gas discharge lamp, high-intensity technology, applied in the direction of gas discharge lamps, discharge lamps, circuits, etc., can solve the problems of increased lamp voltage, unsuitable for low rated power HID lamps, etc., and achieve the effect of improving the beam maintenance rate

Inactive Publication Date: 2013-01-02
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another problem associated with conventional HID lamps is the increase in lamp voltage as the lamp ages
Therefore, the method adopted by US 6,392,346 is not suitable for low power rated HID lamps, for example, lamps for automotive headlight applications

Method used

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  • Mercury-free high intensity gas-discharge lamp
  • Mercury-free high intensity gas-discharge lamp
  • Mercury-free high intensity gas-discharge lamp

Examples

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Embodiment Construction

[0036] In Fig. 1, a cross-section of a quartz glass high intensity discharge lamp 1 according to an exemplary embodiment of the invention is shown. Essentially, the lamp 1 comprises a quartz glass discharge vessel 5 enclosing a discharge chamber 2 containing a filling gas. Two electrodes 3 , 4 protrude from opposite ends of the lamp 1 into the discharge chamber 2 . During manufacture, while the discharge vessel is still open at one end, a salt fill (eg, in the form of solid particles of various metal halides), as well as any other fill components (eg, inert gas) can be introduced. The discharge chamber 2 is then sealed by pinching. The volume (or volume) of the discharge chamber 2 is determined by the inner diameter D of the discharge vessel 5 i and outer diameter D o to control. Inner diameter and outer diameter D i 、D o Measured at the widest point.

[0037] The electrodes 3, 4 can be realized as simple rods of uniform thickness from base to tip. However, the thickne...

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Abstract

The invention describes a mercury-free high-intensity gas-discharge lamp (1) comprising a discharge vessel (5) enclosing a fill gas in a discharge chamber (2) and comprising a pair of electrodes (3, 4) extending into the discharge chamber (2), for which lamp (1) the fill gas is derived from a salt fill introduced into the discharge chamber (2) prior to sealing, which salt fill is free of scandium and includes a halide composition comprising a sodium halide to a proportion of at least 65 wt% and at most 97.2 wt%,a thallium halide to a proportion of at least 2 wt% and at most 25 wt%, and an indium halide to a proportion of at least 0.5 wt% and at most 25 wt%.

Description

technical field [0001] The present invention describes a mercury-free high intensity discharge lamp. Background technique [0002] In a high intensity discharge (HID) lamp, an electric arc established between two electrodes produces an intense bright light. When HID lamps are used in automotive headlight applications, they have a number of advantages over other types of lamps. For example, the light output of a xenon metal halide lamp is greater than that of a similar tungsten-halogen lamp. Also, HID lamps have a significantly longer life than incandescent lamps. These and other advantages make HID lamps particularly suitable for automotive headlight applications. [0003] In prior art HID lamps, the discharge chamber contains a combination of a fill gas mainly consisting of xenon, a halide and one or more other metal salts which evaporate during lamp operation. Older HID lamps include mercury in the fill gas. The use of mercury in such lamps is being phased out for obv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/82
CPCH01J61/827
Inventor M.哈亚科T.博勒特
Owner KONINK PHILIPS ELECTRONICS NV
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