公开(公告)号：US20230229261A1

公开(公告)日：2023-07-20

申请号：US18186537

申请日：2023-03-20

Applicant: Alps Alpine Co., Ltd.

Inventor： Akihisa IIKURA ,  Motoshi OI ,  Tomoya SASAKI

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/044 ,  G06F3/04164 ,  G06F2203/04107

Abstract: A first detection signal creation unit has detection nodes connected to detection electrodes in one-to-one correspondence. The first detection signal creation unit supplies charge from each detection node through a second wire to the relevant detection electrode so that a voltage at the relevant detection node vibrates according to an alternating-current voltage, and creates first detection signals matching the supplied charge. First filters are provided in first paths, each of which branches from an alternating-current output node to a first wire. A phase difference signal creation unit creates a phase difference signal matching the phase difference between the alternating-current voltage and one of the first detection signals.