Incandescent lamp with bulb having IR reflecting film

Details Incandescent lamp with bulb having IR reflecting film Incandescent lamp with bulb having IR reflecting film

1985-06-03

1987-03-24

DeMeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313315, H01K 126

Patent

active

046527893

ABSTRACT:
This invention relates to an incandescent lamp bulb comprising a visible light transmitting and infrared ray reflecting film formed on at least either one of the inside and outside of a tubular, transparent bulb, said film being composed of a lamination of alternate high and low refractive index layers, wherein the optical film thickness of any one of the high reflective index layers ranges from 0.21 to 0.31.mu., that of the topmost low refractive index layer ranges from 1/2.times.0.21 to 1/2.times.0.31.mu., that of at least one low refractive index layer ranges from 2.times.0.21 to 2.times.0.31.mu., and that of any remainder low refractive index layer ranges from 0.21 to 0.31.mu..

REFERENCES:
patent: 2552184 (1951-05-01), Koch
patent: 4017758 (1977-04-01), Almer et al.
patent: 4409512 (1983-10-01), Walsh

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