Operation detection device
An operation detection device includes an operation target that accepts contact operation, an operation detection unit that detects contact operation on the operation target as a voltage, a detection unit that detects a frequency of a change in the voltage; and a determination unit that determines a mode of operation of a living body performed on the operation target based on the frequency detected by the detection unit.
1. A touch operation detection device, comprising:
(a) an operation target;
(b) a capacitance sensor which detects changes in capacitance when an object comes into contact with the operation target and generates a capacitance change signal in response thereto;
(c) a piezoelectric sensor that senses a pressing force applied to the operation target and generates an output voltage as a function thereof; and
(d) a controller that determines whether the object that has come into contact with the operation target is a human as a function of the capacitance change signal and the output voltage, the controller making the determination as a function of:
(i) whether the capacitance change signal indicates that the capacitance of the capacitance has changed; and
(ii) whether a peak frequency of the output voltage falls within a predetermined range corresponding to human biological tremors during a time period when the capacitance of the capacitive sensor has changed.
2. The touch operation detection device according to claim 1 , wherein the capacitance sensor also detects changes in capacitance when the object approaches the operation target.
3. The touch operation detection device according to claim 1 , wherein the piezoelectric sensor contains polylactic acid.
4. The operation detection device according to claim 1 , wherein the operation target is a touch screen.