Lighting unit, electrodeless low-pressure discharge lamp, and di

Details Lighting unit, electrodeless low-pressure discharge lamp, and di Lighting unit, electrodeless low-pressure discharge lamp, and di

1996-01-26

1997-12-09

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313486, 313487, H01J 162, H01J 6304

Patent

active

056964269

ABSTRACT:
A lighting unit according to the invention comprises an electrodeless low-pressure discharge lamp and a high-frequency supply. The electrodeless low-pressure discharge lamp is provided with a discharge vessel which is closed in a gastight manner, comprises an ionizable filling, and has an enveloping portion and a recessed portion surrounded by the enveloping portion, which enveloping and recessed portions of the discharge vessel each support a luminescent layer. The electrodeless low-pressure discharge lamp is in addition provided with a coil which is arranged in the recessed portion of the discharge vessel and which is electrically connected to the supply. The conversion efficiency of the luminescent layer on the recessed portion is relatively high compared with that of the luminescent layer on the enveloping portion. This measure renders possible a lower temperature of the core.

REFERENCES:
patent: 4001628 (1977-01-01), Ryan
patent: 4070598 (1978-01-01), DeLuca et al.
patent: 4099090 (1978-07-01), Corth et al.
patent: 4357559 (1982-11-01), Piper
patent: 5006752 (1991-04-01), Eggink et al.
patent: 5105122 (1992-04-01), Kowings et al.

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