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:
Sep. 06, 2022
Filed:
Oct. 19, 2018
3m Innovative Properties Company, St. Paul, MN (US);
Zhisheng Yun, Sammamish, WA (US);
Michael L. Steiner, New Richmond, WI (US);
Jo A. Etter, Kirkland, WA (US);
Timothy L. Wong, St. Paul, MN (US);
Gilles J. Benoit, Minneapolis, MN (US);
John D. Le, Woodbury, MN (US);
Erin A. McDowell, Afton, MN (US);
Susan L. Kent, Shorewood, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
An optical element includes an optical surface configured to receive light at a predetermined wavelength in a range from about 400 nm to about 1000 nm. The optical surface is defined by a vertical axis and a horizontal axis defining four Cartesian quadrants sequentially numbered in a counter-clockwise direction. A first longitudinal section of the optical surface is centered on the vertical axis and a second longitudinal section of the optical surface is centered on the horizontal axis. The first and second longitudinal section each extend across opposite edges of the optical surface and have a same substantially uniform retardance for substantially normally incident light. The optical element includes four discrete retarder sections. Each retarder section is disposed on a respective Cartesian quadrant of the optical surface and has a retardance difference from the substantially uniform retardance of the optical surface that is greater than zero.