Koninklijke Philips Corporation N.V.

Lumileds LLC

Philips Intellectual Property & Standards Gmbh

Jozef Merx

Gerhard Hebbinghaus

Norbert Lesch

Francis Martin Jozef Deprez

Gerald Scholak

A lamp comprising an envelope () of quartz glass surrounding the light source of the lamp is described, wherein an electric conductor (), for example, an electrode rod, is at least partly embedded in the quartz glass material of the envelope (). At the conductor () is provided with protrusions () forming a brush-like structure at this surface. The protrusions () preferably have an average length of between 10 &#x3bc;m and 35 &#x3bc;m.

Lamp comprising a conductor embedded in the quartz glass envelope of the lamp

A method for manufacturing a discharge lamp comprising at least two tubes or bulbs is disclosed. The lamp is especially a high intensity discharge lamp for use for example in a head lamp of a vehicle, and comprises an inner tube or bulb for enclosing an arc discharge chamber and an outer tube or bulb () for sealingly enclosing the inner tube or bulb, wherein the inner volume of the outer tube or bulb () is evacuated or filled with a gas in an easy and reliable way by using at least one two-step pinching and/or roll-on process for fixation of both tubes at least at one of their axial ends, wherein in a first step the fixation is carried out in such a way that a passage () remains that runs in an at least substantially axial direction of the lamp between the inner volume of the outer tube () and the outside of the axial end () of the inner tube or bulb through which passage the inner volume is evacuated and/or filled with a gas, and wherein in a second step the passage is sealingly closed by carrying out a second pinching or roll-on process.

Method for manufacturing a double tube discharge lamp

The invention relates to a method for the thermal treatment of tungsten electrodes having a fibrous mocrostructure and being free from thorium oxide for high-pressure discharge lamps, to such a tungsten electrode free from thorium oxide, to a method of manufacturing a high-pressure gas discharge lamp with at least one such tungsten electrode free from thorium oxide, to a high-pressure gas discharge lamp with at least one such tungsten electrode free from thorium oxide, and to a lighting unit with at least one such high-pressure gas discharge lamp.

Method for the thermal treatment of tungsten electrodes free from thorium oxide for high-pressure discharge lamps

The invention relates to a Hg free high pressure discharge lamp having a quartz envelope and a halide filling, wherein the lamp comprises at least one electrode which comprises tungsten and &#x2267;0 wt. % and &#x2266;0.5 wt. % thorium and whereby the lamp comprises at least one Mo-containing lead-in wire and/or foil whereby the Mo containing wire and/or foil comprises TiOand having a characteristic life time of &#x2267;2500 h and &#x2266;7500 h according to the EU Carmaker cycle test.

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Vaals, Netherlands

Jozef Merx