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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
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.
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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
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.
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公开(公告)号：US20190265838A1
公开(公告)日：2019-08-29
申请号：US16407402
申请日：2019-05-09
Applicant: ALPS ALPINE CO., LTD.
Inventor： Younghoon KIM , Tomoaki TSUCHIYA , Tomoya SASAKI , Shinya ABE , Yasunori WATANABE
Abstract: A touch sensor false detection preventing structure for use in an electronic device is provided. The electronic device includes a housing that is provided with a through-hole provided area through which a sensor sheet passes, a circuit board that is mounted inside the housing, and a touch panel that is electrically connected to the circuit board by the sensor sheet. The touch sensor false detection preventing structure includes protruding portions formed on an inner surface at both ends of the through-hole provided area in planar view so as to protrude a predetermined distance, such that movement at a part of both side ends of the sensor sheet is restricted.
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公开(公告)号：US20230418420A1
公开(公告)日：2023-12-28
申请号：US18461800
申请日：2023-09-06
Applicant: ALPS ALPINE CO., LTD.
Inventor： Tomoya SASAKI , Shotaro ASAKURA
IPC: G06F3/044
CPC classification number: G06F3/044
Abstract: Operation detection device having high detection accuracy based on reduced effects of noise is provided. Operation detection device includes electrostatic sensor, drive circuit to output a drive signal to electrostatic sensor to detect operator's operation on electrostatic sensor, and control unit to determine presence or absence of operation based on output value of electrostatic sensor, and to control drive waveform of drive signal. Control unit controls drive waveform according to a cycle that is a predetermined period of time including both detection period in which detection of operation is performed and non-detection period in which detection of operation is not performed. The drive waveform has a shape that is based on periodic function that repeats a constant pattern for an entirety of the cycle. The control unit changes the phase of the drive signal in the detection period by controlling a property of the drive waveform in the non-detection period.
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