Filter for colored electric lamp

Details Filter for colored electric lamp Filter for colored electric lamp

1989-11-15

1991-05-21

O'Shea, Sandra L.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

313580, 350 16, 350316, H01J 516, H01J 6140, H01K 130, G02B 528

Patent

active

050178253

ABSTRACT:
The colored electric lamp has a lamp vessel (1) carrying a colored translucent interference filter (12) of alternately SiO.sub.2 layers and layers of comparatively high refractive index. In the filter, layers of high refractive index have an optical thickness smaller than 1/4.lambda..sub.0, while SiO.sub.2 layers have an optical thickness larger than 1/4.lambda..sub.0. An SiO.sub.2 layer of 500-900 nm thickness can be present on the filter. The light emitted by the lamp has a higher color saturation and the filter has a better adherence to the lamp vessel than in the case of a lamp comprising a conventional filter having an equal overall thickness of layers of high refractive index.

REFERENCES:
patent: 3897140 (1975-07-01), Tuthill
patent: 4425527 (1984-01-01), Sichel
patent: 4652789 (1987-03-01), Kawakatsu et al.
patent: 4659178 (1987-04-01), Kyogoku
patent: 4689519 (1987-08-01), Coms et al.
patent: 4701663 (1987-10-01), Kawakatsu et al.
patent: 4734614 (1988-03-01), Kuus
patent: 4870318 (1989-09-01), Csanyi et al.

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