Discharge lamp having vitreous shield

Details Discharge lamp having vitreous shield Discharge lamp having vitreous shield

H - Electricity

01

J

313/136

H01J 61/34 (2006.01) H01J 61/56 (2006.01)

Patent

CA 1145385

LD 7932 DISCHARGE LAMP HAVING VITREOUS SHIELD ABSTRACT OF THE DISCLOSURE 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 tube is operated on d.c. The glass sleeve prevents sodium loss from the arc by trapping ultra-violet light and by shielding the arc tube from photo-electrons. 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.

364542

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