Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2006-03-07
2006-03-07
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S761000, C359S770000
Reexamination Certificate
active
07009777
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 or weakly positive power and the second lens unit having a positive power. The second lens unit has first and second subunits (U2S1and U2S2) which provide positive power followed by negative power. The second subunit (U2S2) of the second unit (U2), in turn, has negative power followed by positive power. In this way, an overall short projection lens (e.g., BRL/f0≦0.9) along with small lens elements (e.g., CAmax/f0≦0.8) can be achieved.
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U.S. Appl. No. 10/858,777 entitled “Color-Corrected Projection Lenses for use with Pixilized Panels”, Attorney Docket No. 59141US002 filed on Jun. 2, 2004.
3M Innovative Properties Company
Collins Darryl J.
Jonas George W.
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