High emissivity filament for energy conserving incandescent lamp

Details High emissivity filament for energy conserving incandescent lamp High emissivity filament for energy conserving incandescent lamp

1979-09-17

1981-08-11

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

313112, 313344, 313315, H01J 115, H01J 1908, H01K 102

Patent

active

042836530

ABSTRACT:
An incandescent lamp having a coating thereon which returns infrared energy to the filament to decrease the amount of power consumed by the lamp in order to maintain the filament at a predetermined operating temperature has a predetermined fractional spacing between turns which results in an emissivity greater than 0.5 at 2,000.degree. K. The filament also has a predetermined length to diameter ratio to make it compact and thereby improve its emissivity and the capture of the reflected infrared radiation and to reduce aberration losses. The filament can be a coiled coil or triple coiled coil and can be stabilized by secondary recrystallization.

REFERENCES:
patent: 2126155 (1938-08-01), Van Dyck
patent: 2218345 (1940-10-01), Spaeth
patent: 2859369 (1958-11-01), Williams et al.
patent: 3210589 (1965-10-01), Mason
patent: 3662208 (1972-05-01), Ohmae et al.
patent: 4017758 (1977-04-01), Almer et al.

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