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公开(公告)号：US11877516B2
公开(公告)日：2024-01-16
申请号：US17891299
申请日：2022-08-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masamichi Ando , Hideki Kawamura
IPC: H10N30/30 , G01B7/16 , G01L1/16 , G01D5/18 , H10N30/857
CPC classification number: H10N30/302 , G01B7/16 , G01D5/18 , G01D5/185 , G01L1/16 , H10N30/304 , H10N30/857
Abstract: A displacement sensor having a rectangular shaped elastic member. A piezoelectric element is attached to a first main face of the elastic member. The piezoelectric element has a rectangular-shaped piezoelectric sheet and electrodes on both main faces of the piezoelectric sheet. The piezoelectric sheet is made of poly-L-lactic acid and is at least uniaxially-stretched. The piezoelectric element is attached so that the uniaxial-stretching direction of the piezoelectric sheet is 45° relative to a long-side direction of the elastic member. When the elastic member is bent along the long-side direction, the piezoelectric sheet is stretched along the long-side direction, and the piezoelectric element generates voltage of predetermined level.
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公开(公告)号：US11469364B2
公开(公告)日：2022-10-11
申请号：US16556564
申请日：2019-08-30
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masamichi Ando , Hideki Kawamura
IPC: H01L41/113 , G01B7/16 , G01D5/18 , G01L1/16 , H01L41/193
Abstract: A displacement sensor having a rectangular shaped elastic member. A piezoelectric element is attached to a first main face of the elastic member. The piezoelectric element has a rectangular-shaped piezoelectric sheet and electrodes on both main faces of the piezoelectric sheet. The piezoelectric sheet is made of poly-L-lactic acid and is at least uniaxially-stretched. The piezoelectric element is attached so that the uniaxial-stretching direction of the piezoelectric sheet is 45° relative to a long-side direction of the elastic member. When the elastic member is bent along the long-side direction, the piezoelectric sheet is stretched along the long-side direction, and the piezoelectric element generates voltage of predetermined level.
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公开(公告)号：US10928858B2
公开(公告)日：2021-02-23
申请号：US14744474
申请日：2015-06-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masamichi Ando , Jun Endo , Hideki Kawamura
IPC: G06F1/16 , G02F1/1333 , G06F3/041 , B29K67/00 , G02B5/30 , G02F1/1335
Abstract: An electronic device with pressing input function has a substantially rectangular parallelepiped housing. In the housing, a pressing sensor, a display panel, a protection member, and a computation circuit module are arranged. In the display panel, a polarization plate is arranged on a first side of a liquid crystal panel. In the pressing sensor, electrodes are formed on both planar faces of a piezoelectric film having double refractivity. The pressing sensor is arranged on the operation surface (the display face) side of the housing relative to the front polarization plate.
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公开(公告)号：US10446738B2
公开(公告)日：2019-10-15
申请号：US15455655
申请日：2017-03-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Masamichi Ando , Hideki Kawamura
IPC: H01L41/193 , H01L41/113 , G01B7/16 , G01D5/18 , G01L1/16
Abstract: A displacement sensor having a rectangular shaped elastic member. A piezoelectric element is attached to a first main face of the elastic member. The piezoelectric element has a rectangular-shaped piezoelectric sheet and electrodes on both main faces of the piezoelectric sheet. The piezoelectric sheet is made of poly-L-lactic acid and is at least uniaxially-stretched. The piezoelectric element is attached so that the uniaxial-stretching direction of the piezoelectric sheet is 45° relative to a long-side direction of the elastic member. When the elastic member is bent along the long-side direction, the piezoelectric sheet is stretched along the long-side direction, and the piezoelectric element generates voltage of predetermined level.
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公开(公告)号：US10309844B2
公开(公告)日：2019-06-04
申请号：US15052149
申请日：2016-02-24
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hideki Kawamura
IPC: G01L1/16 , C09J133/00 , C09J201/00
Abstract: A press detecting sensor that includes an operation receiving member and a piezoelectric sensor. The operation receiving member is a multilayer rigid plate including a cover glass, a touch sensor and a display panel fixed via first bonding agents. The piezoelectric sensor includes a piezoelectric film, a first detecting member on a surface at a side of the operation receiving member of the piezoelectric film, and a second detecting member on a surface at a side opposite to the operation receiving member. The first detecting member is bonded to the operation receiving member by an adhesive member, and is bonded to the piezoelectric film by a second bonding agent.
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Patent Agency Ranking
公开(公告)号：US09772236B2
公开(公告)日：2017-09-26
申请号：US14261862
申请日：2014-04-25
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor： Masamichi Ando , Hideki Kawamura
Abstract: A displacement detection device includes a piezoelectric sensor. The piezoelectric sensor is provided with a piezoelectric sheet on both principal surfaces of which detection electrodes are formed. When stress is applied to the piezoelectric sensor, charge is generated, and an output voltage in accordance with this generated charge is detected in a DC voltage detector. A controller measures this output voltage at a predetermined time interval. Every time the controller measures the output voltage, the controller makes a short-circuit control of a switch, and causes the charge generated in the piezoelectric sensor to be released. The controller can thereby detect an amount of change in output voltage generated at the predetermined time interval in accordance with an amount of displacement of the piezoelectric sensor. By sequentially integrating this, the controller can accurately detect the amount of displacement of the piezoelectric sensor which changes across measurement timings.
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公开(公告)号：US09739671B2
公开(公告)日：2017-08-22
申请号：US14596381
申请日：2015-01-14
Applicant: MURATA MANUFACTURING CO., LTD.
Inventor： Keisuke Araki , Hideki Kawamura , Jun Endo
CPC classification number: G01L1/16 , G01L1/205 , G01L1/225 , G01L1/2287 , G01L5/0038
Abstract: A pressing force sensor that includes a sensor element configured with a piezoelectric film, a lead terminal for connection to an external circuit, a wiring conductor which connects pressing force detection electrodes and the lead terminal, and a flexible printed circuit board which withstands solder reflow temperatures. The flexible printed circuit board has the pressing force detection electrodes formed on a first principal surface thereof, and is folded via a folding line while the first principal surface faces inward. The sensor element is deflected by a pressing force applied to a second principal surface which faces outward and is in a first area of the flexible printed circuit board which is on one side with respect to the folding line, and a signal corresponding to the pressing force is thus taken out from the pressing force detection electrodes.
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公开(公告)号：US10512421B2
公开(公告)日：2019-12-24
申请号：US15433082
申请日：2017-02-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hideki Kawamura
IPC: A61B5/11 , H01L41/193 , A61B5/00 , G01B7/16 , H01L41/047 , H01L41/08 , H01L41/113
Abstract: A capacitor is coupled in parallel with a piezoelectric unit in a sensor. The piezoelectric unit is formed by a film which is sandwiched between a signal electrode and a reference potential electrode. A capacitor is formed by a dielectric film located between the signal electrode and a reference potential electrode. As a result, the capacitance of the sensor element is higher than it would be if the sensor only contained the piezoelectric unit.
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公开(公告)号：US10481701B2
公开(公告)日：2019-11-19
申请号：US15608233
申请日：2017-05-30
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hideki Kawamura , Nobuhito Tsubaki , Fumiya Isono , Takafumi Inoue , Takashi Kihara , Jun Endo , Masato Saito
Abstract: An operation input device having an exterior portion that includes a band portion extending in a belt shape and having flexibility and a housing; and a control unit (23) that is housed in the exterior portion and performs input processing based on a detection signal indicating detection of a predetermined operation. The operation input device is provided with a deformation detection unit that outputs a detection signal associated with a deformation of the band portion or a deformation of the housing to the control unit.
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公开(公告)号：US20180314365A1
公开(公告)日：2018-11-01
申请号：US16021265
申请日：2018-06-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： TAKASHI KIHARA , Hideki Kawamura
Abstract: A display device includes a housing, an operation plate, an electrostatic sensor, a piezoelectric sensor, a controller, a storage unit, a display, and a communication unit. When an output voltage of the piezoelectric sensor indicates a first voltage value (Vth1) or larger, the controller determines that the piezoelectric sensor has detected a change in a first pressing force and performs first processing. When an output voltage of the piezoelectric sensor indicates a second voltage value (Vth2) or larger, the controller determines that the piezoelectric sensor has detected a change in a second pressing force. When the piezoelectric sensor detects the change in the second pressing force and the electrostatic sensor continuously detects a touch during a period from the detection of the first pressing force to the detection of the second pressing force, the controller executes second processing.
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