US 12,472,711 B2
Optical system
Andrew J. Ouderkirk, Kirkland, WA (US); Zhisheng Yun, Sammamish, WA (US); Timothy L. Wong, St. Paul, MN (US); Erin A. McDowell, Afton, MN (US); Jo A. Etter, Kirkland, WA (US); and Robert M. Jennings, Shoreview, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed on Dec. 18, 2019, as Appl. No. 16/718,385.
Application 16/718,385 is a continuation of application No. 15/754,002, granted, now 10,564,427, previously published as PCT/US2016/050024, filed on Sep. 2, 2016.
Claims priority of provisional application 62/214,049, filed on Sep. 3, 2015.
Prior Publication US 2020/0124856 A1, Apr. 23, 2020
Int. Cl. G02B 27/28 (2006.01); B29D 11/00 (2006.01); G02B 5/30 (2006.01); G02B 13/00 (2006.01); G02B 17/08 (2006.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01); G02B 27/09 (2006.01); G02B 27/14 (2006.01); G03B 21/28 (2006.01)
CPC B29D 11/00644 (2013.01) [G02B 5/30 (2013.01); G02B 5/3041 (2013.01); G02B 5/305 (2013.01); G02B 5/3058 (2013.01); G02B 5/3066 (2013.01); G02B 5/3083 (2013.01); G02B 13/0055 (2013.01); G02B 17/0804 (2013.01); G02B 17/0856 (2013.01); G02B 27/0068 (2013.01); G02B 27/0081 (2013.01); G02B 27/0172 (2013.01); G02B 27/0905 (2013.01); G02B 27/0983 (2013.01); G02B 27/144 (2013.01); G02B 27/145 (2013.01); G02B 27/148 (2013.01); G02B 27/283 (2013.01); G02B 27/286 (2013.01); G03B 21/28 (2013.01); G02B 17/0896 (2013.01); G02B 2027/011 (2013.01); G02B 2027/013 (2013.01); G02B 2027/0138 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical system comprising:
a first lens;
a partial reflector having an average optical reflectance of at least 30% for at least one desired wavelength; and
a reflective polarizer substantially transmitting light having a first polarization state and substantially reflecting light having an orthogonal second polarization state,
the optical system having an optical axis, a light ray propagating along the optical axis passes through the first lens, the partial reflector and the reflective polarizer without being substantially refracted,
the first lens having opposing first and second major surfaces defined by respective different first and second equations, wherein each equation, but not each major surface, is rotationally symmetric about the optical axis,
wherein each of the first and second major surfaces has a first portion rotationally symmetric about the optical axis and a second portion adjacent the first portion rotationally asymmetric about the optical axis.