Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Reexamination Certificate
2007-10-16
2007-10-16
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
C313S637000, C313S639000, C313S642000
Reexamination Certificate
active
10535803
ABSTRACT:
The invention relates to a high-pressure discharge lamp with a discharge vessel having a filling comprising—a rare gas, for example argon, —mercury, and —chlorine, wherein the filling quantities of mercury [Hg] and chlorine [Cl] comply with the following conditions: —[Hg](E[Cl]3200 (μmole/cm3)2, —[Cl] £ 10 μmole/cm3. The condition [Hg](E[Cl]3200 (μmole/cm3)2 achieves HgCl vapor pressures in the discharge sufficient for generating significant radiation components of the B2S+-X2S+ band system of this molecule. The condition [Cl] £ 10 μmole/cm3 serves to limit the chemical aggressiveness of the chlorine filling, in particular to limit the attacks on the wall and electrodes and thus to achieve longer lamp lives. The addition of chlorine-binding metals, in particular of germanium, leads to a further improvement in the radiation and life properties of the lamp.
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Baier Johannes
Hilbig Rainer
Koerber Achim Gerhard Rolf
Natour Ghaleb
Scholl Robert Peter
Williams Joseph
Won Bumsuk
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