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:
Nov. 07, 2006
Filed:
Dec. 22, 2005
Jacob Moskovich, Cincinnati, OH (US);
Michael B. Larson, Georgetown, OH (US);
Richard J. Wessling, Milford, OH (US);
Jacob Moskovich, Cincinnati, OH (US);
Michael B. Larson, Georgetown, OH (US);
Richard J. Wessling, Milford, OH (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U) and negative second lens units (U) where the negative second lens units are customized in terms of at least one optical property for at least two of the colors of light produced by the CRTs with which the units are used. The at least one optical property is not spectral transmission, although the second lens units can also be customized for spectral transmission. As illustrated in FIGS.B–F and FIGS.B–F, such customization of a non-transmissive property provides an effective and cost effective approach for improving the color performance of CRT projection lens systems. Constructions for the positive first lens unit which improve image contrast and reduce manufacturing costs are also provided.