Electric lamp and discharge devices – With temperature modifier – Electric heater
Patent
1989-09-08
1991-09-24
DeMeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Electric heater
313172, 313565, 313595, 313635, 315 49, 315115, H01J 6120, H01J 6160, H01J 730, H01J 724
Patent
active
050516493
ABSTRACT:
A ballastless high pressure discharge lamp includes an arc tube, electrodes disposed in the arc tube, a column of mercury disposed in the arc tube and having a volume less than the volume of the arc tube, and cushion material disposed in the arc tube adjacent at least one of the electrodes. The cushion material comprises an inert gas impinging upon at least one end of the column of mercury. At least one of the electrodes extends into the column of mercury. The discharge lamp also includes a heating member disposed adjacent the arc tube to separate the column of mercury into two sub-columns by the vaporization of a portion of the mercury column to thereby form a space between the two sub-columns and compress the cushion material and allow one of the mercury sub-columns to engage one of the electrodes whereby to form an arc in the space between the two sub-columns of mercury.
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DeMeo Palmer C.
Gordon Edward A.
John F. Waymouth Intellectual Property and Education Trust
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