Mica heat shield for high intensity discharge lamp

Details Mica heat shield for high intensity discharge lamp Mica heat shield for high intensity discharge lamp

1996-10-25

1998-05-26

Dombroske, George M.

Electric lamp and discharge devices

With gas or vapor

Having electrode shield

313 42, 313623, 313626, H01J 1702

Patent

active

057571341

ABSTRACT:
A high intensity discharge lamp has a light transmissive envelope and an arc tube located within the envelope. The arc tube contains an arc generating and sustaining medium as well as electrodes. A flare is sealed to the lamp envelope and the flare includes two electrically conductive lead-ins sealed therein, each of the lead-ins having a given diameter. A mica heat shield comprising a planar mica disc frictionally engages the lead-ins, the mica disc having a pair of lead-in receiving apertures therein, the receiving apertures having a diameter greater than the given diameter and each having an oppositely extending, radial slot extending therefrom, each of the slots having a width less than the given diameter. The mica heat shield is positioned on the lead-ins closely and adjacent to the upper surface of the flare by having the slots in frictional engagement with the lead-ins.

REFERENCES:
patent: 1930090 (1933-10-01), Gaidies
patent: 4910427 (1990-03-01), Aelterman et al.
patent: 5466987 (1995-11-01), Williamson

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