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:
Oct. 13, 2015
Filed:
Dec. 19, 2011
Andrew J. Ouderkirk, St. Paul, MN (US);
Arokiaraj Jesudoss, Singapore, SG;
Ravi Palaniswamy, Singapore, SG;
Nicholas T. Gabriel, Minneapolis, MN (US);
Andrew J. Ouderkirk, St. Paul, MN (US);
Arokiaraj Jesudoss, Singapore, SG;
Ravi Palaniswamy, Singapore, SG;
Nicholas T. Gabriel, Minneapolis, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A broadband light source includes a phosphor layer excited by light from multiple LEDs. A dichroic reflector reflects light from the LEDs onto the phosphor layer. First and second LEDs are responsible for first and second broadband portions respectively of a broadband output light of the source, each such broadband portion being broadband and nominally white. The device components are configured and arranged so that the first and second broadband light portions have different CIE color coordinates. These portions combine to yield a resultant color for the overall broadband light output of the source, which resultant color is a function of the relative amounts of the first and second broadband light portions. An open-loop or closed-loop controller can independently drive the LEDs to provide a desired mix of the broadband light portions so that the overall broadband light output has a color in a desired design space.