Optical: systems and elements – Lens – With field curvature shaping
Patent
1996-11-13
1998-06-02
Epps, Georgia Y.
Optical: systems and elements
Lens
With field curvature shaping
359649, G02B 300
Patent
active
057609659
ABSTRACT:
A wide-projection angle liquid crystal projection lens system including a condensing lens, installed opposite to a light-emitting surface of an image-forming element for emitting image rays to be magnified and projected onto a screen of a projection display system, for converging the image rays incident thereto, a first lens group, installed opposite to a light-emitting surface of the condensing lens, for compensating for chromatic aberration of the image rays converged and emitted from the condensing lens, a second lens group for changing a direction of the image rays emitted from the first lens group, and a third lens group for magnifying the image rays emitted from the second lens group and projecting the magnified image rays to a reflecting mirror. According to the system, the optical axis of the system can be changed over about 90.degree. utilizing the prism provided in the projection lenses, and thus the height and depth of the projection display system is reduced to a minimum. Also, utilizing the condensing lens provided opposite to the light-emitting surface of the image-forming element, only the image rays emitted from the liquid crystal display panel at nearly light angles pass through the projection lens system, and thereby the contrast of the image is improved.
REFERENCES:
patent: 4526442 (1985-07-01), Betensky
patent: 4620773 (1986-11-01), Fukuda
patent: 4810075 (1989-03-01), Fukuda
patent: 4948237 (1990-08-01), Hirata et al.
patent: 5005950 (1991-04-01), Morin
patent: 5570140 (1996-10-01), Toide et al.
Epps Georgia Y.
Mack Ricky
Samsung Electronics Co,. Ltd.
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