Optics: image projectors – Distortion compensation
Patent
1997-01-10
1998-03-03
Dowling, William
Optics: image projectors
Distortion compensation
353 70, 353101, G03B 2114
Patent
active
057227527
ABSTRACT:
A multimedia projector comprises a optical frame that mounts, from back to front, a light source, a back fresnel lens, a back polarizer, an LCD display object, a front polarizer, a front fresnel lens, and a front lens group for projecting images formed by the LCD display object. To provide keystone distortion correction of projected images, the front fresnel lens is manually and selectively tiltable about an axis extending parallel with the plane of the LCD display object. The selective tilting is accomplished by a manually movable fresnel actuator with a cammed surface. A control arm extends between the fresnel actuator and the fresnel lens, and rides on the cammed surface such that a relatively large movement of the fresnel actuator produces a relatively small adjustment in tilt of the fresnel lens in order to permit fine adjustment of the fresnel lens tilt. To provide contrast adjustment, a contrast adjustment mechanism is attached to the back polarizer to permit the manual selective tilting of the back polarizer about an axis extending perpendicular to the front polarizer, in order to optimize contrast of images projected by the front lens group.
REFERENCES:
patent: 4002408 (1977-01-01), Amma
patent: 4089599 (1978-05-01), Kuboshima
patent: 4436393 (1984-03-01), Vanderwerf
patent: 5548357 (1996-08-01), Appel et al.
Carlson Timothy M.
Dowling William
In Focus Systems, Inc.
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