Koninklijke Philips Corporation N.v.

Ralf Muckel

Michael Haacke

Manfred Westemeyer

Wilfried Emunds

Paul Hellwig

Markus Gerhard

Pieter Postma

Georg Haselhorst

Juergen Schoeneich

Herbert Schartmann

Jürgen Schoeneich

A high pressure gas discharge lamp has electrodes that project into a discharge space surrounded by a discharge wall. The discharge space has a filling of rare gas and metal halides. The metal halide composition comprises halides of sodium and scandium with a mass ratio of halides of Sodium and Scandium of 0.9-1.5. In order to provide a lamp that can be easily manufactured and is well suited for operation at reduced power, the discharge vessel wall is of externally and internally cylindrical shape. The lamp may be manufactured by providing a cylindrical tube of quartz material, heating the tube at two distant portions and forming grooves there, inserting two electrodes into the tube and heating and pinching the tube at both ends to seal the discharge space. Manufacture is carried out without a bulb forming step such that the discharge space remains in externally and internally cylindrical shape.

Discharge lamp with improved discharge vessel

A lamp () for an automotive headlamp and a method for manufacturing such kind of a lamp () is provided, wherein the lamp () comprises a burner () for emitting light, a metal holder () connected to the burner () for supporting the burner (), a first socket part () made from a heat-resistant plastic material, which is connected to the burner (), and a second socket part (), through which a part of the burner (), which is connected to a first electrical pole (), is led for connecting the burner () to a voltage source, wherein the second socket part () is arranged adjacent to the first socket part () such, that at least one insulating gap () for providing voltage resistance in mainly radial and/or axial direction is provided. Due to the first socket part () it is possible to receive the hot burner () by the socket without impairing the heat resistance, wherein the second socket part () may be made from a cheaper material. This leads to a reduction of production costs without impairing the heat resistance or the voltage resistance provided by the insulating gap () between the first socket part () and the second socket part ().

High-pressure discharge lamp and a method of manufacturing a high-pressure discharge lamp

A mercury-free gas discharge lamp suitable in particular for motor vehicles has an enhanced discharge arc diffuseness. The lamp according includes an inner vessel and/or outer bulb with a structured arrangement or pattern such that the discharge arc diffuseness of the lamp is increased, such as by 0.01 mm to 1.5 mm.

Increasing the discharge arc diffuseness in mercury-free discharge lamps

A high-pressure gas discharge lamp (HID &lsqb;high intensity discharge&rsqb; lamp) is described which is designed in particular so as to be free from mercury and suitable for use in automobile technology. To achieve improved lamp properties, in particular a substantially equal luminous efficacy compared with lamps of the same power and having a gas filling with mercury, as well as a burning voltage which is as high as possible, a geometry is proposed for the discharge space ( ) which raises the temperature of the coldest spot in the lamp to such a degree that the light-generating substances can enter the gas phase to a sufficient extent also without mercury, and in particular in combination with the use of a metal halide as a voltage gradient generator.

High-pressure gas discharge lamp

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Aachen, Germany

Ralf Muckel