Optical projection system

Details Optical projection system Optical projection system

1995-10-20

1996-07-30

Dowling, William C.

Optics: image projectors

Reflector

353 97, 353 31, 348771, G03B 2128

Patent

active

055416799

ABSTRACT:
An optical projection system includes a non-point white light source for emanating a white light, a source lens for focusing the white light, a source stopper having a source aperture for shaping the white light into a predetermined configuration, an optical means having a reflection surface for reflecting the white light, a field lens for collimating the white light, an array of M.times.N thin film actuated mirrors for changing the optical path of the white light reflected therefrom, a projection stopper having a projection aperture for passing a predetermined amount of the white light, a relay lens system having a plurality of lenses for modulating the size of the predetermined configuration of the white light, a RGB pixel filter for dividing the white light into the primary light beams, a projection lens for projecting the primary light beams and a projection screen for displaying an image made up of M.times.N number of pixels thereon. In the optical projection system, the RGB pixel filter is disposed between the projection stopper and the projection lens, and hence the white light only has to pass through the RGB pixel filter once, which will, in turn, prevent the lowering of the intensity of the white light and hence the optical efficiency of the system, and it will also cut down the amount of the white light that is reflected away, thereby reducing noises at the projection screen.

REFERENCES:
patent: 5245369 (1993-09-01), Um et al.
patent: 5371559 (1994-12-01), San-Nohe et al.
patent: 5379081 (1995-01-01), Kim et al.
patent: 5473393 (1995-12-01), Manabe
patent: 5486881 (1996-01-01), Hwang

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