公开(公告)号：US12204714B2

公开(公告)日：2025-01-21

申请号：US17929838

申请日：2022-09-06

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuki Tachibana ,  Hiroaki Kitada

IPC: G06F3/041

Abstract: An operation detection sensor is provided and an electronic apparatus is provided that detect an operation on an operation target regardless of a waveform state of an output voltage of a sensor. The operation detection sensor includes a piezoelectric element, a voltage detection circuit that detects a voltage generated in the piezoelectric element, and a calculation unit that obtains a reference voltage by averaging detection voltages of the voltage detection circuit, and detects an operation on an operation target when a state in which a voltage difference between the reference voltage and the detection voltage is a predetermined value or more continues for a predetermined time or more.

公开(公告)号：US11847289B2

公开(公告)日：2023-12-19

申请号：US17816551

申请日：2022-08-01

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Masamichi Ando ,  Takashi Kihara ,  Hidekazu Kano ,  Yuuki Tachibana

IPC: G06F3/044 ,  G06F3/041 ,  G01L1/16

CPC classification number: G06F3/0447 ,  G01L1/16 ,  G06F3/0414 ,  G06F2203/04105

Abstract: A pressing sensor is provided that generates an output voltage of a first polarity by deforming with an operation plate when a part of a user's body touches the operation plate, and generates the output voltage of a second polarity by deforming with the operation plate when the part of the user's body is moved away from the operation plate. Moreover, a calculation unit calculates an electrical parameter integral value by time-integrating an electrical parameter that changes with the output voltage generated by the pressing sensor. The electrical parameter has a third polarity when the output voltage has the first polarity and has a fourth polarity when the output voltage has the second polarity. The calculation unit calculates a subtraction electrical parameter integral value obtained by subtracting a predetermined value having the third polarity per unit time from the electrical parameter integral value.