Low sag tungsten filament having an elongated lead interlocking

Details Low sag tungsten filament having an elongated lead interlocking Low sag tungsten filament having an elongated lead interlocking

1990-05-09

1991-12-10

Yusko, Donald J.

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313578, H01K 102

Patent

active

050721470

ABSTRACT:
Improved tungsten coil filaments having good sag resistance and useful in double ended, high intensity and energy efficient tungsten halogen lamps having an IR reflecting filter on the filament chamber. These coil filaments have a microstructure which is a large, elongated and interlocking grain structure produced by a high temperature heat treatment process.

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Pugh and McWhorter, "An Elastic Recovery Test for Recrystallization", Metall. Trans, v. 20A, pp. 1885-1887 (9/89).
Tungsten, pp. 136-137 (1952 Chapman & Hall, Ltd., London).

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