The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 2006
Filed:
Jun. 02, 2004
Jacob Moskovich, Cincinnati, OH (US);
Jacob Moskovich, Cincinnati, OH (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have first and second lens units (U,U), 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 (L) having a generally meniscus shape and a second lens element (L) having a biconcave shape when its surface configurations are described by best fit spherical surfaces. The second lens element (L) has an Abbe number (v) which is (a) less than or equal to 55 and (b) less than the Abbe number (V) of the first lens element (L). The second lens element (L) also has an optical power (φ) 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 (φ). This combination of lens shapes, Abbe numbers, and optical powers provides higher order lateral color correction without the need for abnormal partial dispersion glasses.