US 12,326,586 B2
Low wave-front error optical filter film
John D. Le, Woodbury, MN (US); Kazuta Saito, Tokyo (JP); and Michael L. Steiner, New Richmond, WI (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/760,517
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Aug. 17, 2020, PCT No. PCT/IB2020/057743
§ 371(c)(1), (2) Date Mar. 15, 2022,
PCT Pub. No. WO2021/053424, PCT Pub. Date Mar. 25, 2021.
Claims priority of provisional application 62/903,156, filed on Sep. 20, 2019.
Prior Publication US 2022/0350066 A1, Nov. 3, 2022
Int. Cl. G02B 5/30 (2006.01); G02B 27/28 (2006.01)
CPC G02B 5/305 (2013.01) [G02B 27/283 (2013.01)] 19 Claims
OG exemplary drawing
 
13. A polarizing beam splitter comprising:
a multilayer polymeric reflective polarizer disposed between first and second optical prisms and comprising opposing first and second major surfaces;
a first optical bonding layer making physical contact with and bonding the first major surface of the reflective polarizer to the first optical prism; and
a second optical bonding layer making physical contact with and bonding the second major surface of the reflective polarizer to the second optical prism, wherein for light at a wavelength of 0.6328 microns incident on the polarizing beam splitter from each of the first and second major surface sides of the reflective polarizer, the polarizing beam splitter has a reflected root mean square wavefront error of less than about 0.5 waves.