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US 4,747,678 AGranted
Optical relay system with magnification
AssigneeThe Perkin-Elmer Corporation
InventorsDavid R. Shafer, Abe Offner, Rama Singh
Life of this patent
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Abstract
There is disclosed a ring field relay optical system incorporating concave spherical mirrors and including magnification achieved, at least partially, by a convex spherical mirror. In further modifications, aberrations introduced by the convex mirror are controlled by lens groups formed from fused silica. The system is usable from the visible through the deep ultraviolet portion of the spectrum.
Claims20
An optical system for forming a magnified image of an object within an annular ring field concentric with the optical axis of the system, comprising:
- first, second, and third concave spherical mirrors, a convex spherical mirror providing substantially all of the magnification in the system, each of said mirrors having its center of curvature on the optical axis of the system, said first concave mirror being disposed to receive light from an object area, said convex mirror being disposed to receive light from said first concave mirror, said second concave mirror being disposed to receive light from said convex mirror, and said third concave mirror being disposed to receive light from said second concave mirror and focus it at a final image area, said second concave mirror focusing light at an intermediate image area between said second and third concave mirrors.
Dependencies are inferred from the claim text.