Incandescent lamp with extended filament lifetime

Details Incandescent lamp with extended filament lifetime Incandescent lamp with extended filament lifetime

1982-05-26

1987-10-27

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313580, 313315, 313334, H01K 126, H01K 132

Patent

active

047032200

ABSTRACT:
An incandescent lamp has an envelope within which is enclosed an incandescent filament. The incandescent filament is surrounded by a tubular element with open ends. The element transmits visible radiation, and reduces but does not eliminate convection around the filament. This reduces the rate at which evaporated filament material is carried away from the filament and deposited elsewhere within the lamp. If desired, a filter coating may be placed on the element for reflecting infrared radiation back to the filament and transmitting visible radiation away from the filament and out of the lamp. The element may engage the filament leads for mounting purposes.

REFERENCES:
patent: 4280076 (1981-07-01), Walsh
patent: 4281274 (1981-07-01), Bechard et al.
patent: 4338540 (1982-07-01), Sovilla

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