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. 23, 2018
Filed:
May. 19, 2014
Applicant:
3m Innovative Properties Company, St. Paul, MN (US);
Inventor:
Fei Lu, Cupertino, CA (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/122 (2006.01); F21V 8/00 (2006.01);
U.S. Cl.
CPC ...
G02B 6/0036 (2013.01); G02B 6/0001 (2013.01); G02B 6/0065 (2013.01); G02B 6/0066 (2013.01); G02B 6/001 (2013.01); G02B 6/0038 (2013.01);
Abstract
A lightguide includes a center optical axis and includes a plurality of light extracting structures formed on a surface of the light guide, each structure includes a reflecting surface adapted to extract light propagating along the optical axis by reflecting the propagating light toward a light exit side of the light guide. The reflecting surface makes an angle of less than 45 degrees and greater than 10 degrees with the optical axis.