Halogen incandescent lamp

Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For plural electrodes of discharge device

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313222, 313252, H01J 1716

Patent

active

043664091

ABSTRACT:
A halogen incandescent lamp performing halogen cycle in operation, comprising a bulb formed of light-transmitting material in which gas containing halogen atoms and inert gas are enclosed, a tungsten filament with working temperature of 2,800.degree. K. or more contained in the bulb, at least a pair of lead-in wires connected to or integrally formed on both ends of the tungsten filament, respectively, and having a part sealed in the bulb, the lamp characterized in that the light-transmitting material is aluminosilicate glass having a strain point of 660.degree. C. or higher and an average thermal expansion coefficient of 41.times.10.sup.-7 to 48.times.10.sup.-7 cm/cm/.degree.C. at a temperature of 100.degree. to 300.degree. C., and that at least filament-side seal portions of the lead-in wires have a diameter of 0.2 to 0.6 mm.

REFERENCES:
patent: 3496401 (1970-02-01), Dumbaugh, Jr.
patent: 3798491 (1974-03-01), Malm
patent: 3829729 (1974-08-01), Westlund, Jr. et al.
patent: 3978362 (1976-08-01), Dumbaugh, Jr. et al.
patent: 4074167 (1978-02-01), van den Broek et al.
patent: 4105826 (1978-08-01), Thomas

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