Electric lamp and discharge devices: systems – Pulsating or a.c. supply
Patent
1990-09-06
1992-06-09
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
315209R, 315DIG7, H05B 4116
Patent
active
051210347
ABSTRACT:
Miniature high pressure arc lamps containing a substantial pressure of xenon, in addition to metal halide and mercury, can provide instant light at turn-on and are suitable for automotive headlamps. The high pressure of xenon aggravates convection which causes arc bowing and overheating of the envelope above the arc. By operating the lamp at high frequency within selected bands, acoustic modes are excited in the fill which straighten the arc and make the envelope more isothermal. Frequency modulation of the input can be used to broaden the band selected for acoustic operation and relax the tolerance on arc tube and circuit parameters needed for a match. Acoustic operation may also be used to effect physical displacement of the arc for beam switching.
REFERENCES:
patent: 4170746 (1979-10-01), Davenport
patent: 4232243 (1980-11-01), Rigden
patent: 4373146 (1983-02-01), Bonazoli
patent: 4527097 (1985-07-01), van der Heijden
patent: 4705991 (1987-11-01), Ganser
Allen Gary R.
Allison Joseph M.
Davenport John M.
Hansler Richard L.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Jacob Fred
LaRoche Eugene R.
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