US 11,865,808 B2
Shaped optical films and methods of shaping optical films
Robert M. Jennings, Shoreview, MN (US); William T. Fay, Woodbury, MN (US); Jo A. Etter, Stillwater, MN (US); Arthur L. Kotz, Woodbury, MN (US); and David J. W. Aastuen, 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 May 16, 2022, as Appl. No. 17/744,917.
Application 17/744,917 is a continuation of application No. 16/754,825, granted, now 11,358,355, previously published as PCT/IB2018/058253, filed on Oct. 23, 2018.
Claims priority of provisional application 62/578,135, filed on Oct. 27, 2017.
Prior Publication US 2022/0274359 A1, Sep. 1, 2022
Int. Cl. B32B 1/00 (2006.01); B29D 11/00 (2006.01); B29C 51/42 (2006.01)
CPC B32B 1/00 (2013.01) [B29C 51/428 (2013.01); B29D 11/0073 (2013.01); B29D 11/00644 (2013.01); B29D 11/00932 (2013.01); B32B 2307/416 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A curved optical film comprising a plurality of polymeric layers shaped along orthogonal first and second directions such that:
a first curve being an intersection of the optical film with a first plane orthogonal to the second direction and to a reference plane has a best-fit first circular arc subtending a first angle at a center of curvature of the first circular arc of greater than 180 degrees, the optical film having a maximum projected area in the reference plane; and
a second curve being an intersection of the optical film with a second plane orthogonal to the first direction and to the reference plane has a best-fit second circular arc subtending a second angle at a center of curvature of the second circular arc of at least 30 degrees,
wherein each location across at least 90% of a total area of the optical film has a reflectance greater than about 80% and a transmittance less than about 2% for normally incident light having a same predetermined wavelength and a same first polarization state.