Position sensor for a timepiece setting stem
US10041813B2 · kind B2 · utility
0Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2015 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Sep 23, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/94068
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitive sensor to determine instantaneous angular position of a rotatable element in a timepiece, such as a setting stem of a wristwatch. Static electrodes are configured to form, in conjunction with rotor electrodes of the rotatable element, a first differential capacitance pair and a second differential capacitance pair. A sensor calculation unit is configured to sense difference values from the differential capacitances pairs and to evaluate the angular position of the rotatable element from the difference values using predetermined information relating the differential capacitance values to angular position values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.