High-pressure discharge lamp

Details High-pressure discharge lamp High-pressure discharge lamp

1978-10-18

1980-11-11

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

315 74, 315 49, 313 17, 01J 1978, 01J 2316, H01J 744, H01J 1346

Patent

active

042335426

ABSTRACT:
High-pressure discharge lamps, having a sealed discharge vessel surrounded by a sealed glass envelope, are known in which an oxidizable metal foil (e.g. of molybdenum) is located, in the space between the vessel and the envelope substantial on the axis of the vessel and is electrically in series with the discharge path. If the envelope is fractured for any reason and the lamp is subsequently ignited, the temperature of the foil is increased due to the discharge current passing through it. The foil is oxidized, and hence fractured, by the air which has permeated said space and the lamp is, extinguished. Such oxidation and fracture normally takes about ten minutes. In accordance with the invention, the foil (14) in the space between the envelope (1) and vessel (2) is arranged close to the wall of the vessel adjacent to an electrode (6) so as to be heated mainly by heat generated in the vessel. This reduces the fracturing time to about one minute.

REFERENCES:
patent: 4013919 (1977-03-01), Corbley
patent: 4090105 (1978-05-01), Koo
patent: 4143301 (1979-03-01), Strauss et al.

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