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US 5,635,802 AGranted
Lighting unit having electrodeless low-pressure discharge lamp with a luminescent layer
AssigneeU.S. Philips Corporation
InventorHerman J. G. Gielen
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AssigneeU.S. Philips Corporation
InventorHerman J. G. Gielen
Estimating the term…
A lighting unit according to the invention comprises an electrodeless low-pressure discharge lamp 20 provided with a discharge vessel 20 enclosing a discharge space 20 with an ionizable filling in a gastight manner. The discharge vessel 20 has a recessed portion 23 and an enveloping portion 23 which transmits radiation generated in the discharge vessel. Means are present in the recessed portion for initiating and maintaining an electric discharge in the discharge space. The means comprise a member for generating an electric field in the discharge space. The recessed portion is provided with a luminescent layer, which is subdivided into mutually separated regions, at a surface facing the discharge space. The lighting unit further comprises a supply unit for supplying the means. The lamp of the lighting unit according to the invention has a comparatively low ignition voltage.
A lighting unit comprising an electrodeless low-pressure discharge lamp provided with a discharge vessel which encloses a discharge space containing an ionizable filling in a gastight manner and which has a recessed portion and an enveloping portion which is permeable to radiation generated in the discharge vessel, while the recessed portion is provided with a luminescent layer at a surface facing towards the discharge space, and means are present in the recessed portion for achieving and maintaining an electric discharge in the discharge space, which means comprise a member for generating an electric field in the discharge space (21), and the lighting unit in addition has a electrical supply unit for supplying said means, characterized in that the luminescent layer on the recessed portion is subdivided into mutually separated regions.
An electrodeless low-pressure discharge lamp, comprising:
A discharge vessel, comprising a light transmissive wall which encloses a discharge space containing an ionizable filling in a gastight manner and which has a recessed portion and an enveloping portion which is permeable to radiation generated in the discharge vessel, while the recessed portion is provided with a luminescent layer at a surface facing towards the discharge space, characterized in that the luminescent layer on the recessed portion is subdivided into mutually separated regions.
Dependencies are inferred from the claim text.