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:
Dec. 05, 2006
Filed:
Aug. 01, 2005
Melvyn H. Kreitzer, Cincinnati, OH (US);
Jacob Moskovich, Cincinnati, OH (US);
Melvyn H. Kreitzer, 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 a first unit (U) separated from a positive second unit (U) by a distance sufficient to accept a reflective surface (RS) for folding the lens' optical axis. The lenses are telecentric on the short conjugate side, have a large field of view in the direction of the long conjugate, and have low aberration levels. By using negative lens elements (Land L) composed of plastic materials having large positive Q-values at the long conjugate side of the first lens unit (U), the lenses can achieve low levels of lateral color, including low levels of secondary lateral color, with reduced cost compared to lenses which employ anomalous dispersion glasses in the first lens unit.