Back to results
US 2009/0289550 A1Published application
High-pressure mercury discharge lamp
AssigneeOSRAM GmbH
InventorsRainer Koger, Markus Kolodziejczyk, Wolfgang Spielmann
Life of this patent
Estimating the term…
Abstract
The invention relates to a high-pressure mercury discharge lamp for DC operation at a nominal wattage of more than 1.5 kW. Said high-pressure mercury discharge lamp comprises an anode, at least some areas of which are made of a material containing at least some tungsten, said material having a grain number of more than 200 grains per mm2 and a density of more than 19.05 g/cm3.
Claims19
A high pressure mercury discharge lamp that is provided for DC operation with a nominal power of higher than 1.5 kW, comprising
- a discharge vessel,
- an anode and a cathode that are arranged in the discharge vessel, the diameter of the anode being between 25 mm and 70 mm, and at least the anode being formed, at least in some areas, from a material that has at least a proportion of tungsten and
- a fill that is located inside the discharge vessel and contains mercury with a fill quantity of between 0.5 mg/cm3 and 7 mg/cm3, as well as at least one inert gas with a cold fill pressure of higher than 0.8 bar,
- characterized in that
- the material of the anode has a grain number of greater than 200 grains per mm2 and
- a density of higher than 19.05 g/cm3.
3 more elements
Dependencies are inferred from the claim text.