Patent No. 6,598,976
Issued: July 29, 2003 Filed: Sept 5, 2001
METHOD AND APPARATUS FOR IMAGE ENHANCEMENT AND ABERRATION CORRECTIONS IN A SMALL REAL IMAGE PROJECTION SYSTEM, USING AN OFF-AXIS REFLECTOR, NEUTRAL DENSITY WINDOW, AND AN ASPHERIC CORRECTED SURFACE OF REVOLUTION
Inventors: Westort; Kenneth S. (Ithaca, NY); Robinson; Douglas L. (Ithaca, NY)
For information: http://www.opd3d.com/
A real image projection system comprises a single curved mirror having two different optical surfaces of revolution, one on the convex surface and one on the concave surface. In one embodiment, the convex surface is a conical curve of spherical or parabolic surface of revolution, coated with a reflective optical coating. The concave surface is much like that of a Mangin mirror, but it has an aspheric surface of revolution, optimized to reduce spherical aberrations over a larger area offset from the optical axis. The system optionally employs a single aspheric surface of revolution on the concave surface for reduction of aberrations, although the Mangin mirror approach, using an aspheric concave surface of revolution, is the preferred embodiment.
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