Discharge lamp with automatic shut off

Details Discharge lamp with automatic shut off Discharge lamp with automatic shut off

1984-12-21

1986-12-16

Dixon, Harold

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

315 74, 337290, H01J 744

Patent

active

046299394

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.

REFERENCES:
patent: 460140 (1891-09-01), Howell
patent: 471302 (1892-03-01), Marx
patent: 4013920 (1977-03-01), Petro
patent: 4208614 (1980-06-01), Strauss et al.
patent: 4305020 (1981-12-01), Nalepa
patent: 4388557 (1983-06-01), Shaffer

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