Compact incandescent coiled coil filament

Details Compact incandescent coiled coil filament Compact incandescent coiled coil filament

1986-04-14

1987-07-28

Chatmon, Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

315 71, 313341, 445 48, H01J 116, H01J 1910, H01K 114

Patent

active

046833978

ABSTRACT:
This invention provides an improved compact fine wire incandescent lamp filament and method for making such having a primary mandrel ratio in the range of about 1.40 to about 4.00 and a secondary mandrel ratio which is greater than or equal to the primary mandrel ratio. The improved filament design exhibits an increase in compactness and retains or increases structural rigidity while exhibiting minimal sag when the filament is incorporated into an incandescent lamp of the tungsten halogen type variety. The compact coiling method is particularly useful in designing compact filaments for high voltage applications where it is desirable to eliminate the use of rectifying means to lower the effective voltage across the filament.

REFERENCES:
patent: 2218345 (1940-10-01), Spaeth
patent: 2424518 (1947-07-01), Stuart
patent: 3942063 (1976-03-01), Winter et al.
patent: 4208609 (1980-06-01), Berlec
patent: 4316116 (1982-02-01), Graves et al.
patent: 4461973 (1984-07-01), Kaufman et al.
patent: 4480212 (1984-10-01), Monahan et al.
patent: 4499401 (1985-02-01), Graves et al.
patent: 4547704 (1985-10-01), Brinn et al.

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