Koninklijke Philips Corporation N.V.

Martinus Joseph Maria Kessels

Cornelis Johannes Maria Denissen

Gerardus Marinus Josephus Franciscus Luijks

Ton Reinier Mulderij

Maria Louisa Renders

Theodorus Petrus Cornelis Maria Vos

Disclosed is a lamp comprising a ceramic discharge vessel () with end parts () and with electrodes () which are connected to a respective external contact via a respective feedthrough (). Each feedthrough is sealed with a sealing part () thereof by a sealing compound () in the end part. The discharge vessel gastightly encloses a discharge space into which said two electrodes extend from the end part and which contains an ionizable filling. The sealing compound comprises at least one first component chosen from the group consisting of ruthenium (Ru), iridium (Ir), osmium (Os) and rhenium (Re), and comprises at least one second component chosen from the group consisting of silicium (Si), boron (B), phosphor (P). Thus, a halide resistant lamp vessel is obtained exhibiting excellent lifetime characteristics and long lifetimes.

Sealing compound and ceramic discharge vessel comprising such sealing compound

The high-pressure discharge lamp comprises a discharge vessel provided with a first and a second lamp electrode, an outer envelope which surrounds the discharge vessel with space and which is provided with a lamp cap. A tube-like UV enhancer having a longitudinal axis is provided in the space having a ceramic wall and provided with an internal enhancer electrode connected to the first lamp electrode and by way of a capacitive coupling connected to the second lamp electrode, and which enhancer electrode has an end inside the enhancer. The capacitive coupling is formed by a metal curl positioned around the UV enhancer in a plane perpendicular to the longitudinal axis of the UV enhancer and close to the end of the enhancer electrode. The lamp shows on ignition with a relative small ignition voltage only a very small ignition delay.

High-pressure discharge lamp having construction for preventing breakdown

The invention relates to a metal halide lamp having an outer bulb containing besides a discharge vessel a UV enhancer (UVE). The UVE has a ceramic wall and, according to the invention, is provided with a pair of internal electrodes. Preferably, at least one of the electrodes has an electrode winding with emitter.

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Eindhoven, Netherlands

Martinus Joseph Maria Kessels