Optical filters complementary angular blocking regions
US11899230B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2022 |
| Grant date | Feb 13, 2024 |
| Priority date | — |
| Expiry date | May 17, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2207/123
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An example optical filter may include an angle blocking layer having a first angular light blocking range θAL relative to a normal axis, and an interference filter adjacent the angle blocking layer having a second angular light blocking range θIF relative to the normal axis. θIF and θAL at least partially overlap. The example optical filter has a predetermined light transmission zone comprising angles from 0° to a maximum light transmission angle θTmax relative to a normal axis of the major surface. The example optical filter has a predetermined angular light blocking zone θB, a union of θIF and θAL. An example optical filter may include an interference filter having an incidence angle-dependent reflection band and an absorbing layer having an absorption band. The incidence angle-dependent reflection band and the absorption band may overlap at at least one wavelength at at least one angle of incidence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.