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US 4,233,653 AGranted
Low-pressure mercury vapor discharge lamp
AssigneeU.S. Philips Corporation
InventorsHermanus M. Jongerius, Rein W. van der Wolf
Life of this patent
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Abstract
Low-pressure mercury vapor discharge lamp having a luminescent layer and a conductive transparent coating. An amalgam is disposed in the discharge space to reduce loss of light owing to greying of this layer.
Claims1
A low-pressure mercury vapor discharge lamp for cooperation with an associated electrical power supply which comprises:
- a tubular glass envelope having first and second ends, first and second electrodes sealed respectively at said first and second ends of said envelope with connection means extending out of said envelope, an ionizable medium disposed in said tube which includes mercury, a light-transmissive conductive layer disposed on the inside of said glass envelope which is not connected to either electrode, said layer extending over substantially the full axial extent of said envelope and extending over less than the entire extent of the envelope at each axial cross-section, a luminescent coating disposed on said layer, and an amalgam disposed in said tube.
Dependencies are inferred from the claim text.