Sealed beam headlamp and method for testing its serviceability

Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope

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Details

313113, 313572, 313579, 313643, 445 3, 445 18, H01K 128, H01K 150, H01J 942

Patent

active

047206527

ABSTRACT:
A sealed beam lamp having an outer envelope defining a gas-tight enclosure filled with an inert nonreactive gas at a pressure in the range of 5 to 50 Torrs, and an illuminating burner capsule mounted within the enclosure. The integrity of the gas-tight enclosure as well as the pressure of the gas is verified by creating a predetermined electrical potential within the enclosure to form a glow discharge in the gas if the gas pressure is within a predetermined range indicating the lamp is serviceable and an arc discharge if the gas pressure is in excess of the range indicating the lamp is defective.

REFERENCES:
patent: 3364378 (1968-01-01), Beesley
patent: 3418512 (1968-12-01), T'Jampens et al.
patent: 4302697 (1981-11-01), Demas et al.
patent: 4463277 (1984-07-01), De Caro

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