Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1996-04-10
1998-03-03
Williams, Hezron E.
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313634, H01J 6500
Patent
active
057239410
ABSTRACT:
A lighting unit is disclosed having an electrodeless low pressure discharge lamp which is provided with a discharge vessel closed in a gastight manner and comprising an ionizable filling. The discharge vessel has a recessed portion and an enveloping portion. The recessed portion and the enveloping portion each have a fastening to a metal collar, a coil being arranged in the recessed portion for generating a high-frequency magnetic field for maintaining an electric discharge in the discharge vessel. The enveloping portion is provided at an inner surface with a light-transmitting, electrically conductive layer. The conductive layer is electrically connected to a lead-through member of which the metal collar forms part in that the conductive layer covers a region of the lead-through member which adjoins the inner surface of the enveloping portion and which is at a distance from at least one of the fastenings between the discharge vessel and the collar. The lighting unit according to the invention can be efficiently manufactured, and the lead-through member forms a reliable electrical connection to the conductive layer.
REFERENCES:
patent: 4645967 (1987-02-01), Bouman et al.
patent: 4745323 (1988-05-01), Northrop et al.
patent: 4797595 (1989-01-01), De Jong
Egbert, III Walter M.
Larkin Daniel S.
U.S. Philips Corporation
Williams Hezron E.
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