Low-pressure mercury vapor discharge lamp
AssigneeU.S. Philips Corporation
InventorsAdrianus J. H. J. Van Zon, Johannes R. Gelens
Life of this patent
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Abstract
Low-pressure mercury vapor discharge lamp comprising a, preferably folded, discharge tube located within a lamp envelope and having electrodes and an electric stabilization ballast, which is partly surrounded by a thin-walled lamp base, which is connected to the envelope. In the region of the connection between the lamp base and the lamp envelope there is a metal plate for cooling the ballast, this heat sink being at the same time a mounting plate for further components in the lamp such as a starter switch.
Claims9
A low-pressure mercury vapor discharge lamp including a lamp envelope member, a discharge tube therein which is closed in a vacuum-tight manner and contains mercury and a rare gas, electrodes between which a discharge takes place during operation being arranged one at each end of the discharge tube, an electric stabilization ballast for the discharge, and a hollow lamp base member which is connected to the envelope member and a lampcap member for fitting the lamp in a luminaire, and a metal plate, at least the electric stabilization ballast and the ends of the discharge tube being connected to the metal plate, the metal plate being arranged near the connection of the lamp base member to the lamp envelope member and extends to one of said members, the metal plate having upright walls with which one or more walls of the ballast are in intimate thermal contact.
Dependencies are inferred from the claim text.