Illumination device having beam splitting polarization means

Details Illumination device having beam splitting polarization means Illumination device having beam splitting polarization means

1993-03-23

1995-01-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, 359 48, G02F 100

Patent

active

053827902

ABSTRACT:
A device for illuminating an area includes a circular reflector for focussing a light ray from a light source into a beam. A polarizer splits the beam into an effective beam having a first polarization direction and a complimentary beam having a second polarization direction. The polarizer reflects the effective radiation toward the area to be illuminated and transmits the complementary radiation to a rough surface having a roughness at least an order of magnitude greater than the wavelength of the light to diffuse the light and reflect at least a portion of the complementary beam back to the reflector and another portion to the area to be illuminated.

REFERENCES:
patent: 1887650 (1932-11-01), Larner et al.
patent: 3512868 (1967-12-01), Gorikewicz et al.
patent: 4798448 (1989-06-01), van Raalte
patent: 4913529 (1990-04-01), Goldenberg et al.
Patent Abstracts of Japan vol. 12 No. 293 Aug. 10, 1988 63-67979.

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