Incandescent lamp with modified helium fill gas

Details Incandescent lamp with modified helium fill gas Incandescent lamp with modified helium fill gas

1975-05-01

1976-08-10

Rolinec, R. V.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313223, 313226, H01K 150

Patent

active

039744132

ABSTRACT:
An incandescent lamp has an envelope defining a sealed fill gas cavity in which is located an electrically energizable tungsten filament that, when energized, has a sheath formed therearound of nonreactive gas and vaporized tungsten to suppress filament evaporation; the gas fill further includes a small quantity of helium in the range of 1% - 6% of the total gas charge effective to increase the density of the sheath and to increase temperature gradient within the sheath thereby to produce a drive force that improves the redeposition of tungsten vapor from the sheath back to the filament thereby to increase bulb life.

REFERENCES:
patent: 2219890 (1940-10-01), Freitag et al.

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