Electric lamp and discharge devices – With gas or vapor – Having a particular total or partial pressure
Patent
1989-09-08
1990-11-06
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
Having a particular total or partial pressure
313631, 313285, 313113, H01J 1720, H01J 1704, H01J 61073, H01J 6140
Patent
active
049689169
ABSTRACT:
A xenon metal halide lamp having an improved electrode structure that is particularly suited for automotive applications is disclosed. The electrode is comprises of a tip portion that is located at one end of a shank with the shank having a filament coiled therearound. The tip and shank portions are designed to allow for high initial current during starting and low current during operation. The coil filament is situated in opposite neck portions of an envelope forming the light source so as to; (1) cause the electrodes to be axially aligned within the light source; (2) keep the shank of the electrode from intimate contact with the envelope thereby preventing the condensation of the mercury and allowing for substantial vaporization of the metal halide ingredients at the neck portion; and (3) prevent the thermal expansion of the electrode from cracking the envelope.
REFERENCES:
patent: 2518944 (1950-08-01), Scott
patent: 3706900 (1972-12-01), Van Beek
patent: 4254356 (1981-03-01), Karikas
patent: 4574219 (1986-03-01), Davenport et al.
Davenport John M.
Giordano Rocco T.
Hansler Richard L.
Springer Robert H.
Corwin Stanley C.
General Electric Company
Jacob Fred
McMahon John P.
O'Shea Sandra L.
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