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Halogen lamp for pulse operation

A pulse-operated, halogen technology, applied in the field of halogen incandescent lamps, can solve the problems of reduced life of halogen incandescent lamps

Inactive Publication Date: 2012-02-08
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It has been found that halogen incandescent lamps with PWM operation have a significantly reduced lifetime

Method used

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  • Halogen lamp for pulse operation
  • Halogen lamp for pulse operation
  • Halogen lamp for pulse operation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] figure 1 An automotive lamp 10 including a glass lamp vessel 12 and a socket 14 is shown. A filament 16 of tungsten-doped material is arranged inside the lamp vessel 12 .

[0029] The socket 14 includes a metal alignment flange 18 and an electrical connector portion 20 having male plug contacts 22 electrically connected to the filament 16 .

[0030] Lamp 10 is intended to be used in such figure 2 The car headlight 24 is shown. The headlight 24 includes a reflector 26 that includes a central mounting opening 28 with a mounting ring 30 . The lamp 10 is mounted in the headlight 24 by being arranged in the mounting opening 28 such that the lamp vessel 12 with the filament 16 is arranged in the reflector volume. The lamp socket 14 is thus arranged on the mounting ring 30 . Here, the positioning flange 18 is positioned on the mounting ring 30 so as to ensure precise axial positioning of the lamp 10 within the reflector 26 .

[0031] The lamp 10 shown is an automotive h...

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PUM

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Abstract

The invention relates to a halogen automotive lamp for pulse width operation, a lighting assembly including a halogen lamp and to a method of operating a halogen lamp. The lamp comprises a transparent lamp vessel with a gas filling comprising a rare gas component and a halogen component. A filament is arranged within the vessel. In conventional halogen lamps operation with pulsed electrical power, such as e.g. PWM operation of automotive halogen lamps for cornering and bending light lead to shortened lifetimes. In order to propose a lamp with increased lifetime under pulse operation, the gas filling comprises nitrogen in an amount of 0.1-5 mol-%. It has surprisingly been found that filament deformation may be counteracted by the corresponding small amount of nitrogen.

Description

technical field [0001] The present invention generally relates to halogen lamps and lighting assemblies incorporating such lamps and methods of operating the lamps. More specifically, the lamp is a halogen incandescent lamp operable with a pulsed power supply. Background technique [0002] As is known to the skilled person, in a halogen lamp the gas filling of the transparent lamp vessel containing the filament comprises a noble gas component and a halogen component. In operation, a halogen cycle in which evaporated (tungsten) material from the filament reacts with the halogen components enables stable operation at high filament temperatures. [0003] Currently, different types of halogen automotive lamps are available, such as, for example, lamps of the known H4, H7 or H8 type. Automotive halogen lamps are characterized by their electrical properties (suitable for operation at an on-board voltage of 12V at their nominal power), their optical properties (i.e. fulfilling e....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01K1/50F21V19/00
CPCH01K1/50Y02B20/00
Inventor B.R.米尔德斯B.肖恩费尔德B.克贝尔
Owner KONINK PHILIPS ELECTRONICS NV