公开(公告)号：US20180239456A1

公开(公告)日：2018-08-23

申请号：US15533376

申请日：2016-01-12

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： TAKATERU SAWADA ,  TAKUMA BESSHI ,  ERIKA SAWADA

IPC: G06F3/044 ,  G01D5/24 ,  H03K17/96

CPC classification number: G06F3/044 ,  G01D5/24 ,  G06F3/041 ,  H01H36/00 ,  H03K17/955 ,  H03K17/962 ,  H03K2017/9613

Abstract: A sensor body of an electrostatic detection sensor includes a first electrode and a second electrode surrounding the first electrode. A controller is configured to obtain a first sensed intensity of the sensor body while where the first electrode is connected to the second electrode. The controller is configured to obtain a second sensed intensity of the first electrode while the second electrode is grounded. The controller is configured to obtain a third sensed intensity of the second electrode while the first electrode is grounded. The controller is configured to determine whether an object approaches the sensor body or not based on first to third calculation values obtained by calculating the respective changes of the first to third sensed intensities with respect to time.