Low-pressure mercury vapor discharge lamp

Details Low-pressure mercury vapor discharge lamp Low-pressure mercury vapor discharge lamp

2007-10-02

2007-10-02

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S573000, C313S493000

Reexamination Certificate

active

10510296

ABSTRACT:
Low-pressure mercury vapor discharge lamp has an at least partly substantially cylindrical discharge vessel (10) with a length Ldv and with an internal diameter Din. The discharge vessel (10) encloses, in a gastight manner, a discharge space (13) provided with a inert gas mixture and with mercury. The discharge vessel (10) comprises discharge means (electrodes20a;20b) for maintaining a discharge in the discharge space (13). According to the invention, the ratio of the weight of mercury mHg in the discharge vessel (10) to the product of the internal diameterDin and the length of the discharge vessel Ldv is given by the relation: wherein C (0.01 (g/mm2. Preferably, 0.0005 (C(0.005(g/mm2. Preferably, the discharge vessel (10) contains less than 0.1 mg mercury. The discharge lamp according to the invention operates under unsaturated mercury conditions.

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