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Discharge lamp, electrode, and method of manufacturing an electrode portion of a discharge lamp

A technology for electrode parts and discharge lamps, which is applied in the parts of gas discharge lamps, the manufacture of discharge tubes/lamps, and discharge lamps, etc., can solve the problems of long sintering time, difficulty in sintering electrodes and porous electrodes, etc. Effect

Inactive Publication Date: 2009-05-27
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] A disadvantage of prior art electrodes is that it is difficult to sinter said electrodes to obtain porous electrodes due to the long sintering times required for large particles

Method used

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  • Discharge lamp, electrode, and method of manufacturing an electrode portion of a discharge lamp
  • Discharge lamp, electrode, and method of manufacturing an electrode portion of a discharge lamp
  • Discharge lamp, electrode, and method of manufacturing an electrode portion of a discharge lamp

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Embodiment Construction

[0022] figure 1 An AC high pressure gas discharge (HID) lamp 1 is shown, hereinafter referred to as lamp 1 . The lamp 1 has a sealed transparent or translucent bulb 2 forming a discharge chamber housing electrodes 3 each having a porous electrode part 4 and an elongated part 5, ie the electrodes 3 have well-defined electrode tips. Current can be fed to or from the electrode 3 via the lead wire 6 and the feed conductor 7 . figure 2 A detailed image of the electrode 3 is shown, where the porous electrode part 4 is a reshaped extruded cylindrical part and the elongated part 5 is a drawn rod.

[0023] image 3 A schematic particle size diagram of the material mixture used to obtain the porous electrode portion 4 according to the embodiment of the present invention is shown. The vertical axis represents the volume percentage of the powder, and the horizontal axis represents the particle size d. FIG. 4 shows a scanning electrode micrograph of part 4 after sintering.

[0024] T...

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Abstract

The invention relates to a discharge lamp comprising a sealed transparent bulb accommodating two electrodes, wherein at least one of said electrodes has at least a porous portion comprising first particles with a first mean particle size ( 1) defined by a first particle size distribution (11) and second particles (20) with a second mean particle size ( 2) defined by a second particle size distribution (21). The first mean particle size ( 1) is smaller than said second mean particle size ( 2). Consequently, an electrode portion with a higher porosity and a longer lifetime is obtained.

Description

technical field [0001] The invention relates to a discharge lamp comprising a sealed bulb housing two electrodes, wherein at least one of said electrodes has at least a porous portion. The invention also relates to an electrode and a method for producing an electrode part of a discharge lamp. Background technique [0002] Discharge lamps generally comprise two electrodes arranged opposite one another in a gas-filled, sealed, transparent or translucent bulb. During operation, these electrodes are supplied with an electric current which results in significant heating of the electrodes. Therefore, the thermal design of the electrodes in, for example, Ultra High Pressure (UHP) or High Pressure Discharge (HID) lamps is an important issue in preventing premature lamp failure during operation. [0003] One way to reduce the effect of temperature on electrode lifetime is to increase the surface area of ​​the electrode. US 6,218,025 discloses a sintered electrode of a refractory m...

Claims

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Application Information

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IPC IPC(8): H01J61/073H01J9/02
CPCH01J9/04H01J9/02H01J61/0735H01J61/0732H01J61/06H01J61/073
Inventor N·赫克E·J·M·侯厄特
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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