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公开(公告)号：US20230175870A1
公开(公告)日：2023-06-08
申请号：US18162507
申请日：2023-01-31
Applicant: Alps Alpine Co., Ltd.
Inventor： Tatsumi FUJIYOSHI , Atsushi MATSUDA
CPC classification number: G01D5/2403 , G01R27/2605
Abstract: A capacitance detection device includes at least one detection electrode, a shield electrode disposed in close vicinity of the detection electrode, an AC signal source that supplies an AC signal to the shield electrode, a detection circuit that detects capacitance between a physical object in close vicinity of the detection electrode and the detection electrode on the basis of a detection signal output from the detection electrode and the AC signal output from the AC signal source, and a phase adjustment circuit provided between the AC signal source and the shield electrode. The phase adjustment circuit advances the phase of the AC signal output from the AC signal source.
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公开(公告)号：US20220244299A1
公开(公告)日：2022-08-04
申请号：US17721238
申请日：2022-04-14
Applicant: Alps Alpine Co., Ltd.
Inventor： Tatsumi FUJIYOSHI
IPC: G01R27/26 , G06F3/044 , H03K17/955
Abstract: A capacitance detection device detecting a capacitance between a detection electrode and a detection target close to the detection electrode has: a first voltage output circuit that outputs a first alternating current voltage to be supplied to a shield electrode placed close to the detection electrode; a second voltage output circuit that outputs a second alternating current voltage with substantially the same frequency as the first alternating current voltage; and an operational amplifier that amplifies the difference in voltage between an inverting input terminal connected to the detection electrode and a non-inverting input terminal to which the second alternating current voltage is applied, and outputs the amplified difference in voltage. With the detection target close to the detection electrode, the second voltage output circuit outputs the second alternating current voltage adjusted so that an output voltage from the operational amplifier has a smaller amplitude than the first alternating current voltage.
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公开(公告)号：US20240028165A1
公开(公告)日：2024-01-25
申请号：US18479639
申请日：2023-10-02
Applicant: Alps Alpine Co., Ltd.
Inventor： Hiroshi SHIGETAKA , Tatsumi FUJIYOSHI
Abstract: A proximity detection device with a detection distance for detecting an object separated to some extent from an operation surface is provided. The proximity detection device includes a proximity detection unit that has a piezoelectric body and first and second electrodes disposed in contact with the piezoelectric body to detect proximity of an object, a signal applying unit that causes the proximity detection unit to perform capacitance detection and ultrasonic transmission and/or ultrasonic reception by applying a plurality of signals of different frequencies to at least one of the first and second electrodes, and a charge measurement unit connected to at least one of the first and second electrodes to measure electric charge.
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公开(公告)号：US20240011801A1
公开(公告)日：2024-01-11
申请号：US18472567
申请日：2023-09-22
Applicant: ALPS ALPINE CO., LTD.
Inventor： Tatsumi FUJIYOSHI , Tetsuya SUZUKI , Shinichi HIGUCHI , Yoshinao TANIGUCHI
CPC classification number: G01D5/2405 , G06F3/04166 , G06F3/044 , G06F2203/04107 , G06F2203/04108
Abstract: A capacitive sensor has: one or more front-side electrodes including at least one detection electrode; an elastic dielectric body disposed below the front-side electrodes; a shield electrode disposed below the elastic dielectric body; a first, second, and third voltage output unit that respectively outputs a first, second, and third AC voltage; and a detection unit that detects a proximity, a contact, and pressing of a detection target to the detection electrode. The first, second, and third AC voltages have substantially the same frequency. The amplitude of the first AC voltage is larger than or equal to the amplitude of the second AC voltage. The amplitude of the third AC voltage is smaller than the amplitude of the second AC voltage. The first AC voltage is output to a driving unit coupled to the detection electrode with capacitances intervening between them. The second AC voltage is applied to the detection electrode.
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公开(公告)号：US20210389842A1
公开(公告)日：2021-12-16
申请号：US17459943
申请日：2021-08-27
Applicant: Alps Alpine Co., Ltd.
Inventor： Tatsumi FUJIYOSHI
Abstract: This detection device includes a sensor electrode, a shield electrode, which has a parasitic capacitance between the sensor electrode and the shield electrode and is driven by an AC voltage, a detection circuit, which is electrically connected to the sensor electrode and the shield electrode and detects the electrostatic capacitance of the sensor electrode, a capacitor, which is connected in series between the sensor electrode and the detection circuit, and a bias unit, which biases the potential of the sensor electrode via a resistor.
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Patent Agency Ranking
公开(公告)号：US20210278929A1
公开(公告)日：2021-09-09
申请号：US17331117
申请日：2021-05-26
Applicant: Alps Alpine Co., Ltd.
Inventor： Tatsumi FUJIYOSHI
IPC: G06F3/044
Abstract: A proximity detecting device includes: a first detection electrode group having detection electrodes; a second detection electrode group having detection electrodes that orthogonally cross the first detection electrode group; an obliquely crossing detection electrode group having detection electrodes that orthogonally cross the first and second detection electrode groups; a detector capable of detecting electrostatic capacitances of each of the first and second detection electrode groups and the obliquely crossing detection electrode group; and a controller that performs detection through switching between a first detection mode in which a proximity state of a detection-target object is determined based on the electrostatic capacitances of the first and second detection electrode groups and a second detection mode in which a proximity state of each of a plurality of detection-target objects is determined based on the electrostatic capacitances of the first and second detection electrode groups and the obliquely crossing detection electrode group.
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公开(公告)号：US20200225797A1
公开(公告)日：2020-07-16
申请号：US16836380
申请日：2020-03-31
Applicant: Alps Alpine Co., Ltd.
Inventor： Tatsumi FUJIYOSHI , Hiroshi SHIGETAKA
IPC: G06F3/041 , H01L41/047 , H01L41/113 , H01L41/04
Abstract: An input device that inputs information corresponding to a change in pressure due to load includes: a first charge detection circuit that outputs a first detection signal corresponding to charges generated in a first piezoelectric sensor and a second piezoelectric sensor; and a switch circuit provided on a path through which the charges are transmitted from the first and second piezoelectric sensors to the first charge detection circuit. The first charge detection circuit alternately iterates a first period in which a first charge is input from a first positive electrode via the switch circuit and a second period in which a second charge is input from a second negative electrode via the switch circuit, reverses a sign of one of the first and second charges, combines a resulting charge with the other charge, and outputs the first detection signal corresponding to the amount of accumulation of the combined charge.
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公开(公告)号：US20200207189A1
公开(公告)日：2020-07-02
申请号：US16818101
申请日：2020-03-13
Applicant: ALPS ALPINE CO., LTD.
Inventor： Tatsumi FUJIYOSHI , Hiroshi SHIGETAKA , Daisuke TAKAI
Abstract: An operation input device includes a resistance element to generate a capacitance between an operating medium and the resistance element in response to an approach of the operating medium to the resistance element, and a power source to supply electric charge to one end and the other end of the resistance element. A first electric unit measures a first electric charge transfer amount supplied to the one end of the resistance element in response to generation of the capacitance. A second unit measures a second electric charge transfer amount supplied to the other end of the resistance element in response to generation of the capacitance. A controller is connected to the first and second units, and detects a position of the operating medium in a direction perpendicular to a surface of the resistance element based on a sum of the first and second electric charge transfer amounts.
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公开(公告)号：US20190384457A1
公开(公告)日：2019-12-19
申请号：US16558395
申请日：2019-09-03
Applicant: ALPS ALPINE CO., LTD.
Inventor： Tatsumi FUJIYOSHI
Abstract: Charge is periodically supplied to a detection electrode so that a first alternating current voltage is generated in the detection electrode, and a detection signal corresponding to the supplied charge is created. A second alternating current voltage having the same frequency and phase as the first alternating current voltage is applied to a plurality of driving electrodes. An amplitude pattern, which is a combination of the amplitudes of the second alternating current voltages to be applied to the plurality of driving electrodes is switched according to a predetermined series of amplitude patterns. In each amplitude pattern included in the series of amplitude patterns, the second alternating current voltage having a certain amplitude is applied to the remaining driving electrodes resulting from excluding one driving electrode, and the second alternating current voltage having an amplitude different from the remaining driving electrodes is applied to the one driving electrode.
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公开(公告)号：US20190294297A1
公开(公告)日：2019-09-26
申请号：US16441665
申请日：2019-06-14
Applicant: ALPS ALPINE CO., LTD.
Inventor： Kiyoshi SASAI , Tatsumi FUJIYOSHI , Shinichi SAGAWAI
Abstract: A capacitance detection device includes a first voltage output circuit configured to output a first alternating current voltage supplied to a shield electrode provided proximate to a detection electrode, a second voltage output circuit configured to output a second alternating current voltage whose frequency and phase are the same as that of the first alternating current voltage and whose amplitude is less than that of the first alternating current voltage, and a current output circuit configured to output a driving current Is to the detection electrode so that the difference between the voltage of the detection electrode and the second alternating current voltage becomes smaller, and output a detection signal corresponding to the driving current. The second voltage output circuit outputs a second alternating current voltage whose amplitude is adjusted so that the driving current in the absence of the object proximate to the detection electrode.
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