Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1990-04-26
1992-04-07
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315176, 315219, 315DIG5, H05B 3702
Patent
active
051031388
ABSTRACT:
The present invention describes a method and apparatus for a high frequency switching gas discharge tube supply which suppresses or eliminates the "bubble effect" in gas discharge tubes containing argon-mercury gas or other gases and which eliminates the migration of mercury or other migratory gases toward one electrode over time. To prevent mercury migration to one electrode over time within an argon-mercury gas discharge tube, the DC bias is periodically reversed in direction resulting in a gas discharge tube display which is uniform in intensity of light over the length of the tube.
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Orenstein Edward D.
Shields Donald M.
Dinh Son
LaRoche Eugene R.
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