Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Electric switch inside evacuated or gas filled envelope
Patent
1979-11-19
1981-12-08
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Electric switch inside evacuated or gas filled envelope
315 75, 315106, 313184, H01J 2550, H01J 1346, H01J 1978, H01K 162
Patent
active
043050204
ABSTRACT:
A high-intensity discharge lamp which has a lamp current-interrupting device in series circuit with the arc tube which is sensitive to any breach occurring in the protective outer envelope. The current-interrupting constituent of the device initially incorporated into the lamp comprises vanadium sesquioxide. The device has predetermined dimensions and an initial predetermined operating resistance. During normal operation of the lamp the device operates at a predetermined temperature sufficiently low so that said device is stable in the presence of the non-reactive atmosphere enclosed by the outer envelope. The predetermined temperature also being sufficiently high so that upon a breach occurring in the outer envelope permitting oxygen to enter, the vanadium sesquioxide rapidly converts to vanadium pentoxide to interrupt the continuity of the power circuit to the arc tube and prevent the operation of the lamp.
REFERENCES:
patent: 4013919 (1977-03-01), Corbley
patent: 4090105 (1978-05-01), Koo
patent: 4143301 (1979-03-01), Strauss et al.
patent: 4195251 (1980-03-01), Bamberg
patent: 4208614 (1980-06-01), Strauss et al.
patent: 4233542 (1980-11-01), Oostuogels et al.
Chatmon, Jr. Saxfield
Lombard R. S.
Westinghouse Electric Corp.
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