Incandescent lamp having good color rendering properties at a hi

Details Incandescent lamp having good color rendering properties at a hi Incandescent lamp having good color rendering properties at a hi

1990-06-15

1992-09-08

DeMeo, Palmer C.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313579, H01K 132

Patent

active

051461307

ABSTRACT:
Four different optical interference films are formed on the outer surface of an incandescent lamp to achieve good color rendering properties at a high color temperature. A first film formed on the lamp includes high and low refractive index layers alternately stacked so that the total number of layers is n (where n is odd number greater than 5) and the optical thickness thereof is 0.12.about.0.17 .mu.m. A second film formed on the first film has the low refractive index layer and the optical thickness of 0.132.about.0.2125 .mu.m, which is calculated by the equation (K+1).times.d/2, wherein K is 1.2.about.1.5 and d is the optical thickness of each refractive index layer of the first film. A third film formed on the second film has at least a high refractive index layer. The total number of refractive index layers of the third film is an odd number of 1.about.(n-4) and the optical thickness of each refractive index layer thereof is 0.144.about.0.255 .mu.m, which is calculated by the expression (K.times.d). A fourth film includes the low refractive index layer having the optical thickness of 0.0720.about.0.1275 .mu.m, which is calculated by the expression (K .times.d/2).

REFERENCES:
patent: 4652789 (1987-03-01), Kawakatsu et al.
patent: 4701663 (1987-10-01), Kawakatsu et al.
patent: 4839553 (1989-06-01), Mellor

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