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. 30, 2014
Filed:
Nov. 19, 2010
Yufeng Liu, Woodbury, MN (US);
David T. Yust, Woodbury, MN (US);
Yufeng Liu, Woodbury, MN (US);
David T. Yust, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A light diffusing optical construction is disclosed. The optical construction includes a symmetric optical diffuser that scatters light in a first direction with a first viewing angle Aand in a second direction orthogonal to the first direction with a second viewing angle A, where Ais substantially equal to A. The symmetric optical diffuser includes an optically transparent first layer and a plurality of randomly arranged optically transparent beads partially embedded in the first layer leaving portions of the beads exposed. The optical construction also includes a specular reflector that reflects light that is not scattered by the symmetric optical diffuser. The specular reflector has a first average reflectance Rin the visible at zero incident angle and a second average reflectance Rin the visible at 60 degree incident angle. R/Ris at least about 1.5. The optical construction also includes a light absorbing layer that absorbs light that is not reflected by the specular reflector.