US 11,927,783 B2
Optical system and optical film
John D. Le, Woodbury, MN (US); Zhisheng Yun, Sammamish, WA (US); Timothy L. Wong, St. Paul, MN (US); Timothy J. Nevitt, Red Wing, MN (US); Adam D. Haag, Woodbury, MN (US); and Arthur L. Kotz, Woodbury, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/054,247
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jul. 11, 2019, PCT No. PCT/IB2019/055936
§ 371(c)(1), (2) Date Nov. 10, 2020,
PCT Pub. No. WO2020/012416, PCT Pub. Date Jan. 16, 2020.
Claims priority of provisional application 62/697,585, filed on Jul. 13, 2018.
Prior Publication US 2021/0215865 A1, Jul. 15, 2021
Int. Cl. G02B 5/30 (2006.01)
CPC G02B 5/305 (2013.01) 14 Claims
OG exemplary drawing
 
1. An optical system comprising:
one or more optical lenses having at least one curved major surface;
a partial reflector; and
a reflective polarizer, such that for a substantially normally incident light in a predetermined wavelength range extending at least from about 450 nm to about 600 nm:
the partial reflector has an average optical reflectance of at least 30%; and
the reflective polarizer has an average optical reflectance Rs for a first polarization state, an average optical transmittance Tp for an orthogonal second polarization state, and an average optical reflectance Rp for the second polarization state, Tp≥80%, Rp≤1%, and 50%≤Rs≤95%.