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Mercury-free high-pressure discharge lamp with a reduced amount of zinc halide

A technology for high-pressure discharge lamps and content, which is applied to discharge lamps, gas discharge lamps, circuits, etc., and can solve problems such as luminous flux drop

Inactive Publication Date: 2012-09-19
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of zinc components in the filling has the disadvantage that the luminous flux produced by the high-pressure discharge lamp decreases with increasing zinc content in the filling

Method used

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  • Mercury-free high-pressure discharge lamp with a reduced amount of zinc halide
  • Mercury-free high-pressure discharge lamp with a reduced amount of zinc halide
  • Mercury-free high-pressure discharge lamp with a reduced amount of zinc halide

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Embodiment Construction

[0028]A preferred embodiment of the invention is a mercury-free halide metal vapor high-pressure discharge lamp with an electrical power consumption of 25 watts. The lamp is designed for use in motor vehicle headlights. The high pressure discharge lamp has a 17mm 3 Discharge vessel 10 , sealed on both sides, of a volumetric discharge space 106 in which an ionizable filling is contained in a gas-tight manner. In the region of the discharge space 106, the outer contour of the discharge vessel 10 forms an ellipsoid, and its inner contour forms a cylinder in the region between the electrodes 11, 12 ( figure 2 ). The walls of the discharge vessel 10 are thus convexly arched in the region of the discharge space 106 and have a greater wall thickness between the electrodes 11 , 12 than at the two ends of the discharge space 106 , at Electrodes 11, 12 are provided in the two ends. The ratio D1 / D2 of the wall thickness lies in the range of 1.2 to 1.3. That is to say, the following...

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Abstract

The invention relates to a high-pressure discharge lamp for vehicle headlights, comprising a discharge vessel (10) which is sealed in a gas-tight manner and which has a discharge chamber (106). Electrodes (11, 12) and a filling for producing a gas discharge are enclosed in the discharge chamber, wherein the filling is designed as a mercury-free filling that contains at least xenon and halides of sodium, scandium, and zinc. The filling has an amount of zinc halide ranging from 0 mg to 1 mg per 1 cm3 of the discharge chamber volume; the amount of halides that is present in the discharge chamber (106) of the discharge vessel (10) ranges from 8 mg to 15 mg per 1 cm3 of the discharge chamber volume; the cold fill pressure of the xenon ranges from 1.0 megapascal to 1.8 megapascal; and the volume of the discharge chamber (106) of the discharge vessel (10) has a value ranging from 0.015 cm3 to 0.022 cm3.

Description

technical field [0001] The invention relates to a high-pressure discharge lamp according to the preamble of claim 1 . Background technique [0002] A high-pressure discharge lamp of this type is disclosed, for example, in EP 1 351 276 A2. Said document describes a high-pressure discharge lamp for automotive headlamps with a mercury-free filling having a concentration between 2 mg and 6 mg per 1 cm 3 Zinc iodide content within the range of the volume of the discharge vessel. [0003] Patent document US 7,126,281 B1 describes a high-pressure discharge lamp for automotive headlamps with an electrical power consumption of about 35 watts and a mercury-free filling consisting of xenon and the metals sodium, scandium, Indium and zinc halides. [0004] The zinc content of the filling replaces the previously used mercury and is required for adjusting the so-called arc voltage of the high-pressure discharge lamp. The term "arc voltage" denotes the operating voltage of the high-pre...

Claims

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Application Information

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IPC IPC(8): H01J61/82
CPCH01J61/827
Inventor 弗兰克・维尔纳德米特里・扎哈罗夫
Owner OSRAM GMBH
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