Mercury short arched lamp with a cathode containing lanthanum oxide
OwnerDietmar Ehrlichmann, Lars Menzelinventors
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Abstract
The invention relates to a mercury short-arched-high pressure discharge lamp (1) which operates with direct-current, comprising a discharge vessel (2) having two necks (4) arranged in a diametrical manner opposite each other, wherein an anode (26) and a cathode (7), made respectively from tungsten, are melted in a gas-tight manner and said vessel is filled with mercury and at least one inert gas. According to the invention, the material of the cathode tip (11) contains, in addition to the tungsten, lanthanum oxide La2O3 and the mercury content of the filling in the discharging vessel volume is at least 1 mg/cm3 and at the most 6 mg/cm3.
Claims7
A short-arc mercury high-pressure discharge lamp (1) for DC operation, comprising a discharge vessel (2) which has two necks (4) fitted diametrically opposite each other, into which an anode (26) and a cathode (7), each made of tungsten, are fused in a gas-tight manner and which contains a filling of mercury and at least one noble gas, characterized in that at least the material of the cathode tip (11) contains, in addition to tungsten, lanthanum oxide La2O3, and the mercury content of the filling in the discharge vessel is at least 1 mg/cm3 and at most 6 mg/cm3.
Dependencies are inferred from the claim text.