US 12,461,298 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)
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Filed on Feb. 2, 2024, as Appl. No. 18/431,242.
Application 18/431,242 is a continuation of application No. 17/054,247, granted, now 11,927,783, previously published as PCT/IB2019/055936, filed on Jul. 11, 2019.
Claims priority of provisional application 62/697,585, filed on Jul. 13, 2018.
Prior Publication US 2024/0201428 A1, Jun. 20, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 5/30 (2006.01)
CPC G02B 5/305 (2013.01) 12 Claims
OG exemplary drawing
 
1. An optical film comprising a plurality of interference layers reflecting and transmitting light primarily by optical interference, 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 plurality of interference layers has an average optical reflectance Rs for a first polarization state, and an average optical transmittance Tp and an average optical reflectance Rp for a second polarization state orthogonal to the first polarization state, Tp≥80%, Rp≤1%, and 80%≤Rs≤95%.