Electric lamp and discharge devices – With gas or vapor – Having particular electrode structure
Reexamination Certificate
2006-06-06
2006-06-06
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Having particular electrode structure
C313S637000, C313S640000
Reexamination Certificate
active
07057346
ABSTRACT:
An ultra-high pressure mercury lamp is provided in which the disadvantage caused by projections formed on the electrode tips during operation can be eliminated. This is achieved by an arrangement in which a silica glass arc tube, filled with at least 0.15 mg/mm3of mercury, rare gas and halogen in the range from 10−6μmole/mm3to 10−2μmole/mm3, includes a pair of opposed electrodes spaced a distance of at most 2 mm. Additionally, at least one of the electrodes includes a part with a greater diameter which is formed on the electrode shaft using a melting process, a projection which is formed by the tip of the electrode shaft, and a part with a decreasing diameter which extends from the part with the greater diameter in the direction toward the projection.
REFERENCES:
patent: 5109181 (1992-04-01), Fischer et al.
patent: 5497049 (1996-03-01), Fischer
patent: 6545430 (2003-04-01), Ono et al.
patent: 2001-059900 (2001-03-01), None
patent: 2001-174596 (2001-06-01), None
Horikawa Yoshihiro
Tukamoto Takuya
Patel Vip
Safran David S.
Ushiodenki Kabushiki Kaisha
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