公开(公告)号：US11269121B2

公开(公告)日：2022-03-08

申请号：US16071544

申请日：2016-05-06

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Guanglei Du ,  John A. Wheatley ,  Yi Hang Lv ,  Anthony M. Renstrom ,  Neeraj Sharma ,  Fuguo Xu

IPC: G02B5/26 ,  G02B5/22 ,  G02B5/20 ,  G02B5/28

Abstract: A system may include one or both of a light emitter (46) and a light receiver (40), and an optical filter (10). The optical filter (10) includes a wavelength selective scattering layer (14). The wavelength selective scattering layer (14) may have a near-infrared scattering ratio of less than about 0.9. The filter (10) may have a visible reflective haze ratio of greater than about 0.5. A method may include disposing the wavelength selective scattering layer (14) adjacent one or both of the light emitter (46) and the light receiver (40). The optical filter (10) may include a wavelength selective reflective layer (16). The optical filter (10) may include a wavelength selective absorbing layer (34). An article may include the optical filter (10). The wavelength selective scattering layer (14) may have an average near-infrared scattering of less than 60%, an average visible scattering of greater than 10%, and a difference between the % total visible reflectance and the % diffuse visible reflectance of less than 20.