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:
Jan. 06, 2015
Filed:
Jul. 09, 2013
3m Innovative Properties Company, St. Paul, MN (US);
Timothy J. Nevitt, Red Wing, MN (US);
Timothy J. Hebrink, Scandia, MN (US);
Michael F. Weber, Shoreview, MN (US);
Rolf W. Biernath, Wyoming, MN (US);
David G. Freier, St. Paul, MN (US);
John A. Wheatley, Lake Elmo, MN (US);
Andrew J. Ouderkirk, St. Paul, MN (US);
Charles D. Hoyle, Stillwater, MN (US);
Kristopher J. Derks, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A front and back reflector are arranged to form a hollow light recycling cavity having an output region, and one or more light sources (e.g. LEDs) are disposed to emit light into the cavity. In one aspect, the back reflector has a design characterized by a first and second parameter. The first design parameter is a ratio of the collective emitting area of the light sources Aemit to the area of the output region Aout, and Aemit/Aout is preferably from 0.0001 to 0.1. The second design parameter is SEP/H, where H is the depth of the recycling cavity, and SEP is an average plan view source separation associated with the light sources. Other aspects of the disclosed extended area light sources are also described.