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. 21, 2019
Filed:
Nov. 19, 2013
3m Innovative Properties Company, St. Paul, MN (US);
Tri D. Pham, Woodbury, MN (US);
Steven H. Kong, Woodbury, MN (US);
Haiyan Zhang, Woodbury, MN (US);
Joseph T. Aronson, Menomonie, WI (US);
Michael R. Leaf, Eau Claire, WI (US);
Gary T. Boyd, Woodbury, MN (US);
Nicholas A. Johnson, Burnsville, MN (US);
Qingbing Wang, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Optical diffusing films are made by microreplication from a structured surface tool. The tool is made using a 2-part electroplating process, wherein a first electroplating procedure forms a first metal layer with a first major surface, and a second electroplating procedure forms a second metal layer on the first metal layer, the second metal layer having a second major surface with a smaller average roughness than that of the first major surface. The second major surface can function as the structured surface of the tool. A replica of this surface can then be made in a major surface of an optical film to provide light diffusing properties. The structured surface and/or its constituent structures can be characterized in terms of various parameters such as optical haze, optical clarity, Fourier power spectra of the topography along orthogonal in-plane directions, ridge length per unit area, equivalent circular diameter (ECD), and/or aspect ratio.