Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1982-11-15
1984-07-31
Demeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313113, 313573, 313579, H01K 128, H01K 150
Patent
active
044632770
ABSTRACT:
A compact halogen-cycle type incandescent lamp is provided with an envelope that is composed of a selected hard glass (a borosilicate or an aluminosilicate type glass for example) and then dosed with an amount of bromine which is correlated with the glass composition in such a manner that it counteracts the deleterious release of water-vapor forming constituents by the glass envelope when the lamp is energized and the glass is hot. The halogen-cycle lamp is especially adapted for use as the concentrated light source in a general service type lamp or a sealed-beam headlamp and, when so employed, has a fill gas pressure that is so correlated with the gas pressure of the non-oxidizing atmosphere in the outer envelope that the total gas pressure does not exceed 1,000 Torr and the envelope of the halogen-cycle lamp operates at a temperature which is sufficient to reliably sustain the halogen cycle but is below the softening temperature of the particular hard glass from which the halogen lamp envelope is made. In the case of a lamp intended for general lighting or residential illuminating purposes, the halogen-cycle lamp component contains iodine rather than bromine since iodine-cycle lamps produce a "warm" light effect.
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DeMeo Palmer C.
North American Philips Lighting Corporation
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