公开(公告)号：US20210333455A1

公开(公告)日：2021-10-28

申请号：US17274309

申请日：2019-09-13

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Ryan T. FABICK ,  Matthew E. SOUSA ,  William B. BLACK ,  Edward J. KIVEL

IPC: G02B5/28

Abstract: An optical film including a plurality of alternating first and second layers disposed on a skin layer is described. The skin layer has an average thickness greater than about 2 microns. A transmittance of the film for substantially normally incident light includes a band edge separating first and second wavelength ranges, where each range is at least 250 nm wide. A reflectance of the film is greater than about 95% for each wavelength in the first wavelength range; an average transmittance of the film is greater than about 80% in the second wavelength range; and a difference between maximum and minimum values of the optical transmittance of the film in the second wavelength range is less than about 30%. The band edge may have a slope that is greater than about 2%/nm. The transmittance may increase monotonically at least from about 10% to about 70% with increasing wavelength.