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

Details Method of and system for detecting the rate of an electronic tim Method of and system for detecting the rate of an electronic tim

1974-01-03

1976-03-30

Queisser, Richard C.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G04B 1700, G04D 712

Patent

active

039465918

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

REFERENCES:
patent: 2748595 (1956-06-01), Hetzel
patent: 2931217 (1960-04-01), Wenot et al.
patent: 3756013 (1973-09-01), Bergey et al.
patent: 3811314 (1974-05-01), Anouchi
patent: 3838564 (1974-10-01), Holcomb

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