PRESSURE DETECTION DEVICE, PRESSURE DETECTION DEVICE CONTROL METHOD, AND PROGRAM

摘要

[Problem] To make it possible to accurately measure a pressing force by means of a pressure sensor. [Solution] In a pressure detection device 1, a pressure sensor 3 has a piezoelectric sheet 21 that generates a piezoelectric signal corresponding to an applied load. A touch detection unit 7 detects a contact to the pressure sensor 3. A switch 11 is capable of performing switching between a charging state and a discharging state of a capacitance 27. An AD conversion unit 39 converts an analog voltage signal into a digital voltage signal, said analog voltage signal having been outputted from an integration circuit 5. An acquisition unit 36 acquires the digital voltage signal in the charging state of the capacitance 27. By controlling the switch 11, a switching unit 35 alternately repeats the charging state and the discharging state of the capacitance 27, and brings the capacitance 27 into the discharge state for a predetermined time after the digital voltage signal is acquired. During a time when the touch detection unit 7 is detecting the contact to the pressure sensor 3, a calculation unit 37 calculates a pressing force measurement value by adding an acquired digital voltage signal.