Incandescent lamp with dichroic trihedral corner reflectors

Details Incandescent lamp with dichroic trihedral corner reflectors Incandescent lamp with dichroic trihedral corner reflectors

1984-07-18

1986-09-16

Willis, Davis L.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Plural diverse optical devices

313113, H01J 516, H01J 6140

Patent

active

046124730

ABSTRACT:
A dichroically reflect/transmit disc is comprised of multiple small trihedral dichroic corner-reflectors and is positioned near an incandescent filament in such a way as to intercept a substantial part of the light emitted therefrom. The dimension of each reflective/transmissive surface of each individual corner-reflector is small in comparison with the width of the filament. Each reflective/transmissive surface reflects light of infrared frequencies, but transmits light of visible frequencies with minimal attenuation. Thus, infrared light is reflected back onto the filament, with the overall result of significantly improving luminous efficacy in terms of the amount of visible light obtained for a given amount of power consumed by the filament.

REFERENCES:
patent: 2102975 (1937-12-01), Rolph
patent: 3309554 (1967-03-01), Lorenzo
patent: 4039878 (1977-08-01), Eijkelenboom et al.
patent: 4331901 (1982-05-01), de Vrijer et al.

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