Color-corrected projection lenses for use with pixelized panels

Optical: systems and elements – Lens – With field curvature shaping

Reexamination Certificate

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C359S651000

Reexamination Certificate

active

07002753

ABSTRACT:
Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have first and second lens units (U1,U2), with the first lens unit having a negative power and the second lens unit having a positive power. The first lens unit has a first lens element (L1) having a generally meniscus shape and a second lens element (L2) having a biconcave shape when its surface configurations are described by best fit spherical surfaces. The second lens element (L2) has an Abbe number (vL2) which is (a) less than or equal to 55 and (b) less than the Abbe number (VL1) of the first lens element (L1). The second lens element (L2) also has an optical power (φL2/0.7CA) at 0.7 of the clear aperture of its short conjugate surface which is negative and has a magnitude which is greater than the second lens element's on-axis optical power (φL2). This combination of lens shapes, Abbe numbers, and optical powers provides higher order lateral color correction without the need for abnormal partial dispersion glasses.

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