Method of and system for detecting the rate of an electronic timepiece

摘要: The operating speed of an electronic timepiece, whose electro-optical indicator is excited by oscillator with a frequency harmonically related to its stepping rate, determined electrostatic sensor including monitoring plate capacitively coupled electrode the indicator. output bipolar pulse train developed across resistor defining differentiation circuit small time constant condenser formed and electrode, capacitance this being on order 1 pf or less so that controlling not significantly loaded presence sensor.