Discharge lamp having vitreous shield

Details Discharge lamp having vitreous shield Discharge lamp having vitreous shield

1979-08-01

1981-07-28

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Filament or electric heater in series with a discharge...

313190, 313207, 313219, 315 46, H01J 744, H01J 1734, H01J 1978, H01K 162

Patent

active

042812747

ABSTRACT:
A jacketed metal halide discharge lamp combining a miniature arc tube containing sodium iodide and a standby filament within an outer envelope, is provided with a glass sleeve around the arc tube. The glass sleeve is preferably connected to a point of potential which is positive relative to the arc tube, suitably the anode when the arc is operated on d.c. The glass sleeve prevents sodium loss from the arc by trapping ultraviolet light and by shielding the arc from photoelectrons. The sleeve serves also to reduce color shift when the arc tube is switched over from "high" to "low", and to protect the outer bulb in the event of arc tube rupture.

REFERENCES:
patent: 3134920 (1964-05-01), Van de Weijer
patent: 3424935 (1969-01-01), Gungle et al.
patent: 3484637 (1969-12-01), Van Boort et al.
patent: 3609437 (1971-09-01), Taeketol et al.
patent: 3780331 (1973-12-01), Knochel et al.
patent: 3995928 (1976-12-01), Shaffner et al.
patent: 4151445 (1979-04-01), Davenport et al.

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