IR illumination module for MEMS-based eye tracking
US11624906B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2019 |
| Grant date | Apr 11, 2023 |
| Priority date | — |
| Expiry date | Nov 18, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0178
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination system having a reduced z-dimensional profile, which is achieved by reflecting light out of plane relative to a light source that generated the light, is disclosed herein. This illumination system includes an IR illumination device, a collimating optic, a turning optic, and a waveguide. The turning optic is specially configured to receive IR light from the IR illumination device and to reflect the IR light out of plane relative to the emission orientation of the IR illumination device. The reflected IR light is reflected towards the collimating optic. The waveguide is positioned in a fixed position relative to the collimating optic and includes an input port or grating to receive the collimated IR light. By reflecting light out of the plane, the size of the illumination system can be beneficially reduced in the z-direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.