High intensity discharge lamp having safety device with pyrophor

Details High intensity discharge lamp having safety device with pyrophor High intensity discharge lamp having safety device with pyrophor

1978-06-22

1980-03-25

Smith, Alfred E.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Electric switch inside evacuated or gas filled envelope

337401, H01J 1734

Patent

active

041952510

ABSTRACT:
A high intensity arc discharge lamp has an arc tube the emission of which includes some harmful UV radiation. An outer envelope surrounds the arc tube and substantially blocks the harmful UV radiation. The lamp includes means to render the arc tube inoperative when the outer envelope becomes cracked or punctured sufficiently to admit air therewithin, the means including a pyrophoric material to initiate combustion of a current carrying portion of the lamp circuit.

REFERENCES:
patent: 4013919 (1977-03-01), Corbley
patent: 4013920 (1977-03-01), Petro
patent: 4032816 (1977-06-01), Rokosz
patent: 4090105 (1978-05-01), Koo

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