公开(公告)号：US20240288614A1

公开(公告)日：2024-08-29

申请号：US18656731

申请日：2024-05-07

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Guanglei DU ,  John A. WHEATLEY ,  Yi Hang LV ,  Anthony M. RENSTROM ,  Neeraj SHARMA ,  Fuguo XU

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

CPC classification number: G02B5/26 ,  G02B5/206 ,  G02B5/208 ,  G02B5/22 ,  G02B5/223 ,  G02B5/281

Abstract: An optical system includes a multilayer optical film configured to block transmission of visible light but allow peaks or bands of certain visible wavelengths to pass through; an object disposed on a first side of the multilayer optical film; and a light source and a light sensor disposed on an opposite second side of, and facing, the multilayer optical film. The object is configured to receive light emitted by the light source through the multilayer optical film. The light sensor is configured to receive light from the multilayer optical film. An optical filter may include the multilayer optical film disposed on a wavelength selective scattering layer and/or on a wavelength selective absorbing layer. The wavelength selective scattering layer may have a near-infrared scattering ratio of less than about 0.9.

公开(公告)号：US20220146725A1

公开(公告)日：2022-05-12

申请号：US17583553

申请日：2022-01-25

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 ,  G02B5/28 ,  G02B5/20

Abstract: A system may include one or both of a light emitter and a light receiver, and an optical filter. The optical filter includes a wavelength selective scattering layer. The wavelength selective scattering layer may have a near-infrared scattering ratio of less than about 0.9. The filter may have a visible reflective haze ratio of greater than about 0.5. A method may include disposing the wavelength selective scattering layer adjacent one or both of the light emitter and the light receiver. The optical filter may include a wavelength selective reflective layer. The optical filter may include a wavelength selective absorbing layer. An article may include the optical filter. The wavelength selective scattering layer 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.