Electric lamp and discharge devices: systems – Confined gas or vapor-type load device with pressure...
Patent
1991-12-04
1993-12-28
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Confined gas or vapor-type load device with pressure...
315117, H01J 1328
Patent
active
052743055
ABSTRACT:
The mercury vapor pressure in a low pressure mercury discharge lamp is thermostatically controlled. A low pressure mercury discharge lamp includes electrodes and a source of mercury vapor sealed in a lamp envelope. A heater and a thermal switching device are in thermal contact with the source of mercury vapor. The heater is energized when the source of mercury vapor is below a predetermined temperature during operation of the lamp. The heater is preferably a resistance heater electrically connected in series with one of the lamp electrodes. The thermal switching device can be a bimetal thermostatic switch. The source of mercury vapor is typically an amalgam selected to have an optimum mercury vapor pressure at the maximum operating temperature of the lamp. The heater and the thermal switching device can be located external to the lamp envelope or can be located within the lamp envelope. The lamp provides a relatively constant light output over a broad range of operating temperatures and different lamp orientations.
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Bessone Carlo S.
GTE Products Corporation
LaRoche Eugene R.
Zarabian A.
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