Koninklijke Philips Corporation N.V.

Herman Muller

Josephus Christiaan Maria Hendricx

Johannes Petrus Maria Ansems

Petrus Antonius Marie Weerdesteijn

Arnoldus Johanna Walravens

The invention relates to a metal halide lamp for a vehicle headlamp comprising a cylindrically-shaped discharge vessel () having a ceramic wall which encloses a discharge space comprising Xe and ionizable filling, and a cylindrically-shaped outer bulb () surrounding the discharge vessel (). According to the invention a portion () of the surface of the outer bulb () facing away from the discharge vessel () is shaped as a negative lens. Preferably, the portion () encompasses a segment of the outer bulb () with a segment angle &#x3b1; in the range between 30&#x2266;&#x3b1;&#x2266;60&#xb0;. Preferably, the portion () forming the negative lens is shaped as a flat surface.

Metal halide lamp and vehicle headlamp

The invention relates to a metal halide lamp which is provided with a discharge vessel having a ceramic wall and enclosing a discharge space. Two electrodes having tips at a mutual distance EA are positioned in the discharge space, which contains besides Xe also an ionizable filling with NaI and CeI . The discharge vessel has an internal diameter Di at least over the length EA. According to the invention it holds that Di<1.4 mm and also that the relation EA/Di<5 is complied with.

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Turnhout, Belgium

Herman Muller