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
First Claim
1. A real image projection system, comprising:
- a) an injection molded acrylic mirror of two different surfaces of revolution, mounted with an optical axis of said mirror at a tilted angle relative to an optical axis of said system; and
b) a neutral density window or beamsplitter positioned along an imaging axis of said system.
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Abstract
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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Citations
25 Claims
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1. A real image projection system, comprising:
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a) an injection molded acrylic mirror of two different surfaces of revolution, mounted with an optical axis of said mirror at a tilted angle relative to an optical axis of said system; and
b) a neutral density window or beamsplitter positioned along an imaging axis of said system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification