Optics: image projectors – Polarizer or interference filter
Patent
1991-08-02
1993-01-19
Cuchlinski, Jr., William A.
Optics: image projectors
Polarizer or interference filter
353 31, 353 37, G02F 113
Patent
active
051810549
ABSTRACT:
Disclosed is an image projector in which a spatial modulation of light is carried out on the two orthogonal components of polarization of light in order to increase the luminous efficiency of the projector. The image projector of the invention includes a light source, a projection screen, a splitter of polarizations splitting the light into two polarized beams having complementary polarizations, two mirrors reflecting the two polarized beams, firstly so as to give them opposite directions and superimpose them on one and the same axis on which a spatial light modulator is positioned and, secondly, to make them pass again through the polarization splitter by which they are superimposed on one and the same axis with one and the same direction and oriented towards the projection screen and/or the light source as a function of their modulation by the spatial modulator.
REFERENCES:
patent: 2449287 (1948-09-01), Flood
patent: 5028121 (1991-07-01), Baur et al.
patent: 5042921 (1991-08-01), Sato et al.
patent: 5073013 (1991-12-01), Sonehara et al.
patent: 5075798 (1991-12-01), Sonehara et al.
patent: 5097323 (1992-03-01), Sato et al.
"Van Norstrand's Scientific Encyclopedia" Edition 7, vol. 2, 1989, New York, US, D. M. Considine et al. p. 1719.
Huignard Jean-Pierre
Loiseaux Brigitte
Nicolas Christophe
Puech Claude
"Thomson-CSF"
Cuchlinski Jr. William A.
Dowling William C.
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