High-pressure discharge lamp with mercury chloride having a limited chlorine content
November 21, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3586898 High pressure electric discharge lamp containing metal halides High pressure mercury vapor discharge lamp Rare earth halide light source with enhanced red emission Metal halide lamp with rhenium skin on tungsten electrode High-pressure metal halide lamp having three part electrode rods High pressure discharge lamp, with tungsten electrode and lighting optical apparatus and image display system using the same Patent #: 6211616 InventorsAssigneeApplicationNo. 10535803 filed on 11/21/2003US Classes:313/640, And rare earth metal313/637, With particular gas or vapor313/639, Mercury vapor313/642, And rare gas313/635, Envelope layer or coating313/641With rare gasExaminersPrimary: Williams, JosephAssistant: Won, Bumsuk Foreign Patent References
International ClassesH01J 61/20H01J 17/20 AbstractThe 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]3 200 (μmole/cm3)2, —[Cl] £ 10 μmole/cm3. The condition [Hg](E[Cl]3 200 (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. | |
