Patent ID: 11953709
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. A system comprising:
one or both of a light emitter or a light receiver;
a reflective layer, the reflective layer including a multilayer optical film; and
a wavelength selective scattering layer, the wavelength selective scattering layer including a plurality of interconnected voids, wherein the wavelength selective scattering layer has a near-infrared scattering ratio of less than about 0.9, the near-infrared scattering ratio being a ratio of an average near-infrared scattering to an average visible scattering, and wherein the wavelength selective scattering layer has a visible reflective haze ratio of greater than about 0.5, the visible reflective haze ratio being a ratio of an average visible diffusive reflectance to an average visible total reflectance, wherein the reflective layer is disposed between the wavelength selective scattering layer and one or both of the light emitter and the light receiver.