Projection display device

Details Projection display device Projection display device

1995-03-24

1997-04-22

Dowling, William

Optics: image projectors

Light shield, mask, hood, or diaphragm

349 62, G03B 2114

Patent

active

056224184

ABSTRACT:
A projection display device comprises: a diaphragm for the illuminating system disposed in the vicinity of a focal point of the light collected by the concave mirror; a collimation lens for rendering parallel the light passing through the aperture of the first diaphragm; a scattering-type liquid crystal light valve for forming forming image on its displaying surface; a field lens for converging the light rendered parallel by the collimation lens; a projection lens having an entrance pupil disposed in the vicinity of a focal point of the light converged by the field lens; and a second diaphragm having an aperture and provided in the projection lens. An aperture varying section of the first diaphragm varies the aperture diameter of the diaphragm of the illuminating system, and the other aperture varying section varies the aperture diameter of the diaphragm of the projection lens, thereby varying the diameter of an entrance pupil.

REFERENCES:
patent: 5123729 (1992-06-01), Kondo et al.
patent: 5142387 (1992-08-01), Shikama et al.
patent: 5321789 (1994-06-01), Kida et al.
patent: 5379083 (1995-01-01), Tomita
patent: 5473393 (1995-12-01), Manabe
patent: 5519518 (1996-05-01), Watanabe et al.
patent: 5541679 (1996-07-01), Yang

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