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:
Jun. 12, 2007
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). 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 (U) includes at least a first color-correcting lens subunit (SU/CC) 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.