Metal vapor arc lamp having thermal link diminishable in heat co

Details Metal vapor arc lamp having thermal link diminishable in heat co Metal vapor arc lamp having thermal link diminishable in heat co

1981-05-04

1983-08-30

Smith, Alfred E.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313 13, 313634, H01J 102, H01J 724, H01J 6152

Patent

active

044019122

ABSTRACT:
A high pressure metal (sodium) vapor lamp comprises an outer vitreous envelope and an inner ceramic arc tube supported within it. The arc tube contains vaporizable metal in excess of the quantity vaporized in operation and the heat balance determines a cold spot whereat excess metal collects. The temperature of the cold spot determines the vapor pressure and the voltage drop across the lamp which must lie between specified limits. A thermal link is provided to a metal member such as the exhaust tube, the heat loss from which influences significantly the temperature of the cold spot. In completed lamps measuring too low in voltage, such thermal link may be partly severed without breaking open the outer envelope in order to raise the voltage. One convenient way utilizes an auxiliary wire which is cut by aiming a laser beam at it. Another convenient way to reduce the conductive cross section of the thermal link is to use a laser to drill one or more holes through a metallic member comprising the thermal link.

REFERENCES:
patent: 3246189 (1966-04-01), Waymouth
patent: 4034252 (1977-07-01), McVey
patent: 4074163 (1978-02-01), van der Leeuw

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