Projection lenses having color-correcting rear lens units

Details Projection lenses having color-correcting rear lens units Projection lenses having color-correcting rear lens units

2007-06-12

2007-06-12

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S663000, C359S708000

Reexamination Certificate

active

11194324

ABSTRACT:
Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a first unit (U1) separated from a positive second unit (U2). The lenses are telecentric on the short conjugate side, have a large field of view in the direction of the long conjugate, have low aberration levels, and include a space between two of the lens elements making up the lens which is sufficient to accept a reflective surface (RS) for folding the lens' optical axis. The second or rear lens unit (U2) includes at least a first color-correcting lens subunit (SU2/CC1) which has a positive-followed-by-negative form and contributes to the correction of the chromatic aberrations of the projection lens, including the correction of lateral color.

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J. Hoogland, “The Design of Apochromatic Lenses,” inRecent Development in Optical Design, R.A. Ruhloff editor, Perkin-Elmer Corporation, Norwalk, CT, 1968, pp. 6-1 to 6-7.

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