Incandescent lamp filament with surface crystallites and method

Details Incandescent lamp filament with surface crystallites and method Incandescent lamp filament with surface crystallites and method

1992-10-01

1995-02-14

Yusko, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313345, 313355, 427 78, 427111, H01J 114, B05D 512

Patent

active

053898532

ABSTRACT:
The invention refers to a filament having improved emission of visible light. The emissivity of a tungsten filament is improved by depositing a layer of submicron-to-micron crystallites on the filament, the layer having substantially submicron spacing between crystallites. The crystallites being formed from tungsten or a tungsten alloy of up to 1 weight percent thorium, up to 10 weight percent of at least one of rhenium, tantalum, or niobium, and the balance substantially tungsten.

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H. G. Craighead, R. E. Howard, D. M. Tennant, "Selectively Emissive Refractory Metal Surfaces", 38 Applied Physics Letters 74 (1981).
"The Application of Tungsten Wire as the Light Source in Incandescent Electric Lamps"; D. J. Jones; Oct. 1973; pp. 503-512.
J. F. Waymouth, "Where Will the Next Generation of Lamps Come From?"; pp. 22-25 and FIG. 20, undated publication.

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