Optical systems and optical filters
US12352991B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2024 |
| Grant date | Jul 8, 2025 |
| Priority date | — |
| Expiry date | May 7, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/21
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.