Coated narrow-band filter with absorbent material
US10317591B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2017 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Nov 28, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/223
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention discloses a coated narrow-band filter having an absorbent material. Two sides of the substrate are respectively an A-side and a B-side, a cut-off layer is coated or screen printed on the A-side, wherein lights having a wavelength within a first band are allowed to pass through the cut-off layer. The substrate is an absorbent layer, or an absorbent layer is provided on the B-side of the substrate. The absorbent layer is made of an absorbent material, lights having a wavelength within a second band are allowed to pass through the absorbent layer. The first band partially overlaps with the second band. For processing convenience, the coated narrow-band filter having an absorbent material is provided at different angles and with small angle of incidence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.