Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent
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.
Chatmon Saxfield
GTE Products Corporation
Jimenez Jose W.
Romanow Joseph S.
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