公开(公告)号：US20230408565A1

公开(公告)日：2023-12-21

申请号：US18364226

申请日：2023-08-02

Applicant: Alps Alpine Co., Ltd.

Inventor： Kiyoshi SASAI ,  Akihisa IIKURA

IPC: G01R27/26 ,  G01R35/00

CPC classification number: G01R27/2605 ,  G01R35/005

Abstract: A calculation unit calculates a detection value of a capacitance of a capacitor based on a detection signal. A correction unit repeatedly performs a shift to a correction mode. When the correction mode is entered, the correction unit controls an AC voltage output unit so that a difference between amplitudes of first and second AC voltages changes, and obtains a correction value corresponding to a change in the detection value of the calculation unit caused by the change in the difference between the amplitudes. The correction unit corrects the detection value calculated by the calculation unit in accordance with the change in the correction values obtained in the correction mode.

公开(公告)号：US20240219210A1

公开(公告)日：2024-07-04

申请号：US18604095

申请日：2024-03-13

Applicant: Alps Alpine Co., Ltd.

Inventor： Akihisa IIKURA

IPC: G01D5/241 ,  G06F3/041 ,  G06F3/044

CPC classification number: G01D5/241 ,  G06F3/04166 ,  G06F3/0418 ,  G06F3/0447 ,  G06F2203/04107

Abstract: A capacitive sensor includes: front-side electrodes including a detection electrode; a cover that covers the front-side electrodes; an elastic dielectric body below the front-side electrodes; a shield electrode below the elastic dielectric body; a first voltage output unit that outputs a first alternating-current voltage to a driving unit coupled to the detection electrode; a second voltage output unit that outputs, to the shield electrode, a second alternating-current voltage having the same phase as the first alternating-current voltage; a detection unit connected to the detection electrode, the detection unit detecting an output matching capacitances among the front-side electrodes; and an operation decision unit that decides whether the cover has been pressed with a detection target, according to a plurality of outputs from the detection unit, the plurality of outputs being obtained when the second voltage output unit changes the amplitude of the second alternating-current voltage to a plurality of amplitudes.

公开(公告)号：US20230058404A1

公开(公告)日：2023-02-23

申请号：US17980332

申请日：2022-11-03

Applicant: Alps Alpine Co., Ltd.

Inventor： Akihisa IIKURA ,  Tomoya SASAKI

IPC: G06F3/041 ,  G01D5/24 ,  G06F3/044

Abstract: A capacitance detection device has: a first capacitor disposed in the path between a first node connected to a detection electrode and a second node; a second capacitor disposed in the path between the first node and the ground; a third capacitor disposed in the path between the first node and a third node connected to a shield electrode placed in proximity to the detection electrode; an alternating-current voltage output circuit that outputs a first alternating-current voltage to the third node; a first attenuation circuit that outputs a second alternating-current voltage resulting from attenuating the amplitude of the first alternating-current voltage; and a charge amplifier that supplies charge to the first capacitor through the second node and outputs a detection signal matching the supplied charge.

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.