Optical position detection of a timepiece crown stem
US10534320B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2015 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | May 11, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/347
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of detecting a movement of a timepiece setting stem arranged to be moved axially along and/or rotated about its longitudinal axis. The method includes a light source illuminating a portion of the setting stem; a light detector receiving a reflected or diffracted light pattern from the setting stem; a processor forming a first pixel pattern representative of the reflected light pattern at a first time instant; the processor forming a second pixel pattern representative of the reflected light pattern at a second, later time instant; and determining that the setting stem has been moved, if the second pixel pattern is different or shifted with respect to the first pixel pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.