Incandescent electric lamp with partial light transmitting coati

Details Incandescent electric lamp with partial light transmitting coati Incandescent electric lamp with partial light transmitting coati

1978-10-18

1980-10-07

Demeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313114, H01K 114, H01K 126, H01K 132

Patent

active

042271134

ABSTRACT:
An incandescent lamp of a type in which infrared (IR) energy is to be reflected back to the filament. The lamp has one section which is coated with an IR reflecting material which also will transmit visible light and another section coated with material which has a high reflectivity to IR energy and a low transmissivity to visible light. The filament is mounted off-center of the optical image axis of the envelope and substantially all of the energy in the visible light range exits from the envelope in no more than two passes.

REFERENCES:
patent: 1342894 (1920-06-01), Bugbee
patent: 2121314 (1938-06-01), Birdseye et al.
patent: 2144400 (1939-01-01), Birdseye
patent: 2488751 (1949-11-01), Verbeek et al.
patent: 2622222 (1952-12-01), Hageman et al.
patent: 2859369 (1958-11-01), Williams et al.
patent: 3209188 (1965-09-01), Freeman
patent: 3209192 (1965-09-01), Decker
patent: 4039878 (1977-08-01), Eijkelboom et al.

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