Title:
POSITION SENSOR FOR A TIMEPIECE SETTING STEM
Document Type and Number:
WIPO Patent Application WO/2016/055275
Kind Code:
A3
Abstract:
A capacitive sensor is described for determining the instantaneous angular position of a rotatable element (3) in a timepiece, such as the setting stem of a wristwatch. Static electrodes (11, 12, 13, 21, 22, 23) are arranged to form, in conjunction with rotor electrodes (5a, 5b) of the rotatable element (3), a first differential capacitance pair (1) and a second differential capacitance pair (2). A sensor calculation unit is configured to sense difference values from the differential capacitances pairs (1, 2) and to evaluate the angular position of the rotatable element (3) from the difference values using predetermined information relating the differential capacitance values to angular position values.
Inventors:
FERRI YVAN (CH)
HAENNI RAPHAËL (CH)
SCHMUTZ DAMIEN (CH)
LAGORGETTE PASCAL (CH)
BALMER RAPHAËL (CH)
HAENNI RAPHAËL (CH)
SCHMUTZ DAMIEN (CH)
LAGORGETTE PASCAL (CH)
BALMER RAPHAËL (CH)
Application Number:
PCT/EP2015/071907
Publication Date:
June 30, 2016
Filing Date:
September 23, 2015
Export Citation:
Assignee:
SWATCH GROUP RES & DEV LTD (CH)
International Classes:
G04C3/00; G01D5/241; H03K17/975
Foreign References:
US20130271119A1 | 2013-10-17 | |||
US20130127449A1 | 2013-05-23 | |||
US6339336B1 | 2002-01-15 |
Attorney, Agent or Firm:
ICB INGÉNIEURS CONSEILS EN BREVETS SA (Fbg de l'Hôpital 3, 2001 Neuchâtel, CH)
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