Image enhancement and aberration corrections in a small real...

Details Image enhancement and aberration corrections in a small real... Image enhancement and aberration corrections in a small real...

2005-08-30

2005-08-30

Nguyen, Judy (Department: 2851)

Optics: image projectors

Projected image combined with real object

C353S078000, C353S010000, C359S479000, C359S631000

Reexamination Certificate

active

06935747

ABSTRACT:
An improved real image projection system comprises, in the primary configuration, a tilted mirror to eliminate ghost reflections, and a unique arrangement allowing the introduction of a second background image without a 50%/50% beamsplitter, while providing system transmission of approximately 50%. A secondary configuration incorporates an elliptical or aspheric curved mirror designed to simulate the surface of a spherical curve when light strikes the elliptical surface at an angle equal to the elliptical angle of the curved mirror. In a third configuration, a single curved mirror has two different optical surfaces of revolution, one on the convex surface and one on the concave surface. The concave surface is much like that of a Mangin lens, but it has an aspheric surface of revolution, optimized to reduce spherical aberrations over a larger area offset from the optical axis.

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