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：US20190025481A1

公开(公告)日：2019-01-24

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

IPC: G02B5/22 ,  G02F1/21 ,  G02B5/26 ,  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.

公开(公告)号：US20190391307A1

公开(公告)日：2019-12-26

申请号：US16071720

申请日：2017-01-20

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： John A. WHEATLEY ,  Guanglei DU ,  David T. YUST ,  Neeraj SHARMA ,  Gilles J. BENOIT ,  Ellison G. KAWAKAMI ,  Anthony M. RENSTROM

IPC: G02B5/20

Abstract: An article includes an optical filter that comprises a wavelength selective reflective layer and at least one wavelength selective absorbing layer. The optical filter has visible transmittance between 400 nm-700 nm of less than about 30% and near infrared transmittance at 830 nm-900 nm greater than about 30%.

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.

公开(公告)号：US20190339432A1

公开(公告)日：2019-11-07

申请号：US16475207

申请日：2018-01-03

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Guanglei DU ,  John A. WHEATLEY ,  Matthew E. SOUSA ,  Anthony M. RENSTROM ,  Neeraj SHARMA

IPC: G02B5/28 ,  B32B5/16 ,  G02B5/02

Abstract: Example systems may include one or both of a light emitter and a light receiver, and an optical filter. The optical filter may include a wavelength selective scattering layer configured to scatter visible light. The optical filter may include a wavelength selective reflecting layer having a predetermined transmission band configured to compensate for a color deviation. The optical filter may include a broadband reflecting layer having a predetermined reflection band configured to compensate for a color deviation. The optical filter may include a low-index layer configured to reduce a color deviation in light emitted by the light emitter or received by the light receiver. The wavelength selective scattering layer may include nanoparticles dispersed in a binder, wherein the ratio of the nanoparticles to the binder by weight is at least 50%. Example articles may include example optical filters.