Discharge lamp with automatic shut off
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United States of America Patent
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-
Dec 16, 1986
Grant Date -
N/A
app pub date -
Dec 21, 1984
filing date -
Dec 21, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high intensity discharge lamp with a safety switch which automatically shuts off the lamp upon rupture of the outer envelope. The switch is formed by a carbon rod disposed in the interior space between the arc tube and the outer envelope and connected in series with one of the electrodes so that the current flow through the rod maintains it at an elevated temperature during operation of the lamp. Upon rupture of the outer envelope, the carbon rod oxidizes and falls, thereby interrupting the electrical path to the electrodes.
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