Cylindrical retroreflector array for rotation tracking
US12104934B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2023 |
| Grant date | Oct 1, 2024 |
| Priority date | — |
| Expiry date | May 1, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P13/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic device is described. The electronic device may include a housing, a rotatable crown, and a self-mixing interferometry (SMI) sensor positioned within the housing. The rotatable crown may include an array of retroreflective surface features that reflect incident light back to a light source. Each retroreflective surface feature of the array of retroreflective surface features may be formed as a corner-cube with three perpendicular faces. The SMI sensor or associated processing electronics may compare originally emitted light with reflected light to identify a movement or distance of the rotatable crown with respect to the SMI sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.