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:
May. 13, 2003
Filed:
Jan. 17, 2001
Jacob Moskovich, Cincinnati, OH (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Telecentric projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a negative first unit (U ) which has at least one negative meniscus element (N ) having at least one aspheric surface and a positive second unit (U ) which has at least one positive element (P ) having at least one aspheric surface. The lens' aperture stop (AS) is located between the two units, and a third lens unit (U ) may be used in the vicinity of the aperture stop to improve the correction of axial color. The lenses have small forward vertex distances, small clear apertures, and long back focal lengths which make them particularly well-suited for use in the manufacture of compact projection systems.