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WO2015125119A1 - Capteur piézoélectrique pour détecter une direction d'actionnement, et appareil électrique qui le contient - Google Patents

Capteur piézoélectrique pour détecter une direction d'actionnement, et appareil électrique qui le contient Download PDF

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Publication number
WO2015125119A1
WO2015125119A1 PCT/IB2015/051309 IB2015051309W WO2015125119A1 WO 2015125119 A1 WO2015125119 A1 WO 2015125119A1 IB 2015051309 W IB2015051309 W IB 2015051309W WO 2015125119 A1 WO2015125119 A1 WO 2015125119A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric sensor
iii
microcontroller
sensor element
sensitivity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2015/051309
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English (en)
Inventor
Pauli Laitinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AITO INTERACTIVE Oy
Original Assignee
AITO INTERACTIVE Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AITO INTERACTIVE Oy filed Critical AITO INTERACTIVE Oy
Publication of WO2015125119A1 publication Critical patent/WO2015125119A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
    • G06F3/04144—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position using an array of force sensing means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/964—Piezoelectric touch switches
    • H03K17/9643—Piezoelectric touch switches using a plurality of detectors, e.g. keyboard

Definitions

  • a piezoelectric sensor for detecting an actuation direction, and an electrical appliance comprising the same
  • the invention relates to piezoelectric input sensors and to devices in which such piezoelectric sensors are used.
  • Piezoelectric material is material that converts mechanical stress into electrical voltage and vice versa. Due to the properties of piezoelectric material, piezoelectric element can excellently be used as sensor for touch user interfaces .
  • the piezoelectric sensor elements are arranged below the surface of a device in such a manner that, when the device is being pressed with the finger, the at least one piezoelectric sensor element is bent, generating a voltage over the at least one piezoelectric sensor element.
  • microcontroller is configured to read the voltage and output a signal in response to the voltage, after having determined that the measured voltage output from piezoelectric sensor element exceeding the preset threshold voltage level for preset time period typical for a human finger in pressing a switch.
  • the piezoelectric sensor element comprises two terminals, of which one terminal is connected to the measurement pin of microcontroller, and the other to the reference voltage pin in the microcontroller.
  • a microcontroller may be configured to sample signals
  • the measurement circuitry can be configured to sample signals representative of the voltage over each of the plurality of piezoelectric sensors employing virtual key algorithm, and to compare magnitude of sampled signals and their integrals representative of the deformation of each
  • the microcontroller may accept inputs, if a pre-defined condition is fulfilled as a virtual key input. In this manner, a touch panel with more keys can be implemented but without actually increasing the number of piezoelectric sensors .
  • An objective of the invention is to improve touch user
  • the objective of the invention is to detect the direction of the actuation of a piezoelectric sensor. This objective can be reached with the piezoelectric sensor according to independent claim 1 and with the parallel device claim 10.
  • the dependent claims describe advantageous aspects of the piezoelectric sensor and of the device.
  • a piezoelectric sensor for detecting an actuation direction comprises : a) a plurality of piezoelectric sensor elements each having a terminal and a reference terminal; and b) a microcontroller electrically connected to the terminals of each of the piezoelectric sensor elements and configured to read signals from each piezoelectric sensor elements between the terminal and the reference terminal indicative of the voltages of each of the piezoelectric sensor elements.
  • the microcontroller is configured to i) to detect actuation direction by analysing signals of neighbouring piezoelectric sensor elements, and ii ) to store or output the detected direction.
  • the analysing by the microcontroller is carried out by comparing time development of the signals read from each neighbouring piezoelectric sensor element.
  • microcontroller i) at least one but preferably two or three sensitivity ranges for sweeping, sliding, and/or rocking have been defined, and ii) one sensitivity threshold for switching has been defined, in such a manner that the
  • sensitivity threshold for switching requires a higher maximum voltage or time sum for a signal read from each piezoelectric sensor element than the sensitivity range or ranges for
  • the range (s) is (are) individual for each of the piezoelectric sensor elements.
  • the direction of an actuation can be determined.
  • the versatility of the piezoelectric sensor can be greatly improved in addition to switch functionality in a reliable manner.
  • the robustness of the integration of piezoelectric sensor into electric appliances can be
  • the versatility of piezoelectric sensor configurations that are required to perform different functions in a device may be increased and/or the reliability of the piezoelectric sensor in devices with variable device surface properties may be improved.
  • the direction of movement can be determined in a reliable manner.
  • the microcontroller is configured to operate on integral or time sums of the signals, the reliability and sensitivity of piezoelectric sensor can be improved
  • rate in determining the direction of the actuation can be increased and reliability to determination the classification of sweep, slide and rocking can be improved.
  • the available classification for the type of the actuation comprises sweeping, sliding, rocking and switching
  • the piezoelectric sensor is an input device of a user interface. For instance, we may now detect whether a user is pressing a key or sliding finger across piezoelectric elements . Or we can detect the direction of user sliding his/her finger. Or we can detect, whether a user is sweeping across one switch and its direction.
  • a piezoelectric sensor may comprises at least one piezoelectric sensor element having at least two terminals, and a
  • microcontroller electrically connected to said at least one piezoelectric sensor element and configured to read a signal indicative of the voltage between the two terminals, and to output at least one output signal in response to the signal read, indicating that the piezoelectric sensor element is being pressed or has been pressed by a finger.
  • the microcontroller may comprise at least one sensitivity threshold register.
  • the microcontroller may then be configured to set or adjust a sensitivity threshold in the sensitivity threshold register in response to at least one sensitivity threshold command it has received over a data bus.
  • range can be also configured to have both upper and lower limit.
  • the microcontroller may be configured to evaluate the signal indicative of the voltage depending on the sensitivity threshold (or range) register, in consequence so defining at least two the sensitivity level of the piezoelectric sensor for different use cases of that sensor.
  • the sensor device mounting arrangement may further comprise an electronic circuit comprising a microcontroller configured to sample signals representative of the voltage over each of the plurality of piezoelectric sensors employing at least cross-talk determination algorithm.
  • a microcontroller configured to sample signals representative of the voltage over each of the plurality of piezoelectric sensors employing at least cross-talk determination algorithm.
  • microcontroller can be configured to interpolate the sliding in between the piezoelectric sensor areas to provide the experience of continuous interaction by means of signalling the sliding acoustically or optically or haptically. Especially beneficial is to the arrangement of light emitting diodes in a row
  • microcontroller to configure to switch on the light emitting diode corresponding the
  • the sliding detection can be combined the interpolation of the virtual key in based on cross-talk detection as well as cross-talk cancellation algorithms described in European patent application 13179992.6 by configuring the microcontroller to have two clearly different stages.
  • first stage sensitivity range to the study of sliding, and its direction and in the second stage the key press study is performed including crosstalk cancellation based on exceeding sensitivity threshold for key press.
  • This is possible since most of the cases the user moves finger faster and with less applied pressure in sliding and sweeping, whereas when their intention is to press the key, more pressure is applied and time the piezoelectric sensor is exposed to the pressure is significantly longer (typically 200- 700 ms ) .
  • the determination of the sliding and its direction can be performed within less than 200ms.
  • study of sliding direction and press analysis can be performed independently. Also it is possible to detect sliding after the key press, if microcontroller is configured accordingly.
  • adjustable sensitivity levels and ranges as well as sweeping, rocking and sliding counter registers improves greatly the device specific optimization of the piezoelectric sensor functionality.
  • flexibility makes it possible to calibrate the values of the sensitivity thresholds and ranges to ensure optimal
  • the device comprises a device surface and a piezoelectric sensor.
  • the device surface has been configured to function as an overlay to the piezoelectric sensor. Thanks to the individual sensitivity range/ranges, the inhomogenities in the device surface may be compensated for in a particularly easy manner.
  • the piezoelectric sensor may be attached to the device surface from below by adhesive layer.
  • piezoelectric sensor may be improved.
  • each dot is attached to conductive foil located between adhesive layer and piezoelectric sensor element.
  • conductive foil located between adhesive layer and piezoelectric sensor element.
  • FIG 1 illustrates a piezoelectric sensor that has been arranged below the device cover of an electrical appliance ;
  • FIG 2 illustrates a circuit showing certain components of the piezoelectric sensor and its connection to microcontroller
  • FIG 3 illustrates a piezoelectric sensor with three
  • FIG 4 illustrates the piezoelectric
  • FIG 5 is a flow diagram illustrating the example of
  • FIG 1 illustrates piezoelectric sensor 2 that has been arranged below a device surface 10 of an electrical appliance 1.
  • perpendicular force is applied by the user to the device surface 10.
  • the force is utilized to mechanically stress the piezoelectric element 22 by bending it.
  • Substrate 20 provides support for the stack of layers on top of it.
  • conductive layer 18 provides electrical connection and recess 27, such as a circular hole, in conducive layer 18 provides enough room for the piezoelectric sensor element 22 to bend downwards.
  • Piezoelectric sensor element 22 comprises a piezoelectric ceramic 28 (preferably a circular layer of piezoelectric material sintered on metallic base plate 25), which has larger diameter than the piezoelectric ceramic 28, and a screen-printed top conductive layer 281, which has slightly smaller diameter than the piezoelectric ceramic 28.
  • a piezoelectric ceramic 28 preferably a circular layer of piezoelectric material sintered on metallic base plate 25
  • a screen-printed top conductive layer 281 which has slightly smaller diameter than the piezoelectric ceramic 28.
  • Piezoelectric sensor element 22 is preferably enclosed in a hole 31 within adhesive layer 16.
  • Dot 26 on top of the piezoelectric sensor element 22 ensures the physical and electrical connection and concentrates the stress field to the piezoelectric sensor element 22.
  • the dot 26 is attached to conductive foil 14, which provides the upper electrical connection to one or more piezoelectric sensor elements 22.
  • Conductive foil 14 has been attached to device surface 10 by adhesive layer 12. In the case shown in FIG 1, dot 26 must be electrically conductive. However, the stack may be constructed without dot 26. Alternatively, dot 26 may be placed on top of upper conductive layer (conductive foil 14), in which case dot 26 does not need to be electrically conductive.
  • recess 27 may be replaced with a hole through substrate 20.
  • FIG 2 illustrates a circuit showing certain components of electronic circuit 90 for a piezoelectric sensor 2 configuration with three piezoelectric sensor elements 22.
  • the person skilled in the art understands that instead of using three piezoelectric sensor elements, any number of piezoelectric sensor elements 22 can be used. Most practically, the number of piezoelectric sensor elements 22 is 1, 2, 3, 4, 5, 6, ... to a few dozens.
  • the piezoelectric sensor elements 22 are most preferably arranged in one-dimensional or two-dimensional arrays.
  • First piezoelectric sensor element 22, I is connected through resistors 46, 47, 52 between the VREF 70 and PZ1-ADC pin 100,1 of microcontroller 40.
  • Second piezoelectric sensor element 22, II is connected through resistors 45, 48, 52 between the VREF and PZ2-ADC 100, II pin of microcontroller 40.
  • Third piezoelectric sensor element 22, III is connected through resistors 44, 49, 52 between the VREF and PZ3-ADC pin 100, III of microcontroller 40.
  • PZ1-ADC 100, I; PZ2-ADC 100, II and PZ3-ADC, 100, III pins lead to the first, second and third analog-to-digital-converter channels, respectively.
  • the signal indicating voltage over first piezoelectric sensor element 22, I, second piezoelectric sensor element 22, II and third piezoelectric sensor element 22,111 can be converted to digital signals and processed by microcontroller 40.
  • Microcontroller 40 is most preferably configured to determine also cross-talk signal read from piezoelectric sensor elements 22 other than the piezelectric sensor element 22 which is closest to the user finger (this piezoelectric sensor element 22 will most probably give the strongest signal) , while the finger exerts pressure on device surface 10.
  • the piezoelectric sensor elements 22 other than the piezelectric sensor element 22 which is closest to the user finger (this piezoelectric sensor element 22 will most probably give the strongest signal) , while the finger exerts pressure on device surface 10.
  • the piezoelectric sensor elements 22 other than the piezelectric sensor element 22 which is closest to the user finger (this piezoelectric sensor element 22 will most probably give the strongest signal) , while the finger exerts pressure on device surface 10.
  • cross-talk signals is performed from signals to pin 100 of microcontroller 40 in a manner that it is possible to identify the geometrical direction of piezoelectrical elements 22 from which cross-talk signals are read from with respect to piezoelectric sensor element 22, whose read signal has reached the 1 st sensitivity range.
  • Each piezoelectric sensor element 22 (such as 22, I; 22, II; and 22,111; or three piezoelectric sensor elements 22 such as in the examples in FIG 3 and FIG 4 or all piezoelectric sensor elements 22 of the piezoelectric sensor 2) may be connected to common line VREF via conductive foil 14 from above and connected to conductive layer 18 via dome 50.
  • All the other electrical components can be connected to the same conductive layer 18 or other side of substrate 20, where both sides have a conductive layer 18 and substrate 20 that acts as base support. Connection from below may be to corresponding ADC channel of microcontroller 40 (e.g. PZ1-ADC, PZ2-ADC, PZ3-ADC if three piezoelectric sensor elements 22,1; 22,11 and 22,111 are used) via capacitors 53, 54, 55, 56, 57 and resistors 44, 45, 46, 47, 48, 49, 52 in FIG 2.
  • microcontroller 40 e.g. PZ1-ADC, PZ2-ADC, PZ3-ADC if three piezoelectric sensor elements 22,1; 22,11 and 22,111 are used
  • the signals generated by piezoelectric sensor 2, shown in FIG 3 and FIG 4 may be collected in the following way:
  • Proportionality P x y for measured piezo electric signal 13 can be defined as measured piezo electric signal 13.
  • P x y indicates numbering of a data sample collected by ADC of microcontroller 40 from signal to pin 100 of microcontroller 40.
  • Sampling frequency can be for example 50 Hz.
  • y indicates the respective pin 100 of microcontroller 40 to which the signal is connected.
  • PZ x y corresponds to the charge collected over the time of one data sample from the signal to pin 100 of microcontroller 40.
  • proportionality may be defined as
  • P x y PZ x y VREF X .
  • VREF X can be measured by the ADC or pre-determined .
  • PZ x y is actual absolute data sample of the piezoelectric sensor element 22. Also sum of the P x y can be defined as
  • n is the number of consecutive data samples required to define the sum (or integral) .
  • Typical values may vary between to 20 consecutive data samples.
  • FIG 5 illustrates the example of the deduction flowchart on directional sensing for sliding and key activation press by microcontroller 40 from data collected from multiple
  • piezoelectric sensor elements 22 are piezoelectric sensor elements 22.
  • Determination 500 starts by collection of measured piezo electric signals 13 in all piezoelectric sensor channels PZ1, PZ2, PZ3 (measurement stage 501) .
  • the measured piezo electric signals 13 will be denoted P x y in the following.
  • the sliding counter register value is added by number +1 (stage 504: slider counter update) .
  • the sliding counter register value is added by number -1.
  • Microcontroller 40 is configured to monitor the slider counter register value.
  • the slide to right -event is determined (in reporting stage 506) by the microcontroller 40 and reported via data bus to the electrical appliance 1.
  • the slide to left -event is determined (in reporting stage 508) by the microcontroller 40 and reported via data bus to the electrical appliance 1.
  • signal P X IX in channels II and I are compared to predetermined switching sensitivity threshold (comparison stage 509) , which threshold is set higher than 1 st sensitivity range (comparison stage 502) . If measured piezo electric signal P X IX exceeds the switching sensitivity threshold (comparison stage 509), press counter register value is added +1 (stage 510). Microcontroller 40 is configured to monitor the press counter register value (stage 510). When the press counter register value exceeds the predetermined counter threshold (in comparison stage 511), the key press-event is determined (in reporting stage 512) by the microcontroller 40 and reported via data bus to the electrical appliance 1.
  • microcontroller 40 In comparison stage 502 when threshold limit of 1 st range is not exceeded, microcontroller 40 is configured to return to the measurement stage 501. In comparison stage 509, when switching sensitivity threshold is not exceeded, microcontroller 40 is configured to return to the measurement stage 501. In comparison stage 507, when the slider counter register value is not falling below negative threshold, microcontroller 40 is configured to return to the measurement stage 501. In comparison stage 511, when press counter register value is not exceeding the threshold, microcontroller 40 is configured to return to the measurement stage 501.
  • the sensitivity threshold and counter threshold register values can be set by commanded electric device 1 via a data bus to microcontroller 40. Alternatively, the register values can be stored to microcontroller 40.
  • microcontroller 40 can be a separate integrated circuit, a programmable gate array (PGA), a synthetized or integrated microcontroller core in a programmable gate array, a custom application specific integrated circuit (ASIC) , or any other device that can execute a program.
  • PGA programmable gate array
  • ASIC application specific integrated circuit

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)

Abstract

Le capteur piézoélectrique (2) de l'invention, servant à détecter une direction d'actionnement, comprend :-une pluralité d'éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III) possédant chacun une borne (26) et une borne de référence (18) ; et un microcontrôleur (40) relié électriquement aux bornes (26) de chacun des éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III) et configuré pour lire des signaux provenant de chacun des éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III) entre la borne et la borne de référence (18), qui indiquent les tensions de chacun des éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III). Le microcontrôleur (40) est configuré pour i) détecter la direction d'actionnement en analysant les signaux lus sur les éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III) voisins et ii) mémoriser ou sortir la direction détectée. Dans le microcontrôleur (40), i) au moins une, mais de préférence deux ou trois plages de sensibilité pour le balayage, le glissement et/ou le basculement ont été définies, et ii) un seuil de sensibilité pour la commutation a été défini, de telle manière que le seuil de sensibilité pour la commutation nécessite une tension maximale ou une somme de temps pour un signal lu sur chacun des éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III) qui soit supérieure à la plage ou aux plages de sensibilité pour le balayage, le glissement et/ou le basculement. Ladite plage ou lesdites plages sont propres à chacun des éléments de capteur piézoélectrique (22, I ; 22, II ; 22, III).
PCT/IB2015/051309 2014-02-20 2015-02-20 Capteur piézoélectrique pour détecter une direction d'actionnement, et appareil électrique qui le contient Ceased WO2015125119A1 (fr)

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FI20145168 2014-02-20
FI20145168 2014-02-20

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3043952A1 (fr) * 2015-11-20 2017-05-26 Faurecia Interieur Ind Panneau de commande a capteur piezoelectrique souple pour un vehicule
CN107525720A (zh) * 2017-08-22 2017-12-29 成都理工大学 一种测试致密储层敏感性的装置及方法
EP3282587A1 (fr) * 2016-08-12 2018-02-14 Big Kaiser Präzisionswerkzeuge Ag Appareil électronique ayant un dispositif à boutons
WO2018038913A1 (fr) * 2016-08-24 2018-03-01 Knowles Electronics, Llc Interface utilisateur intégrant des extensomètres
US10599249B2 (en) 2016-02-29 2020-03-24 Koninklijke Philips N.V. Sensor device and sensing method based on an electroactive material
US10967434B2 (en) 2016-08-12 2021-04-06 Big Kaiser Präzisionswerkzeuge Ag Boring head with an electronic unit
US11789556B2 (en) 2019-03-07 2023-10-17 Aito Bv Touch detection device and method

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JPH01166211A (ja) * 1987-12-23 1989-06-30 Oki Electric Ind Co Ltd 座標検出装置
US20030057808A1 (en) * 2001-09-27 2003-03-27 Samsung Electronics Co., Ltd. Pointing apparatus using piezoelectric film, method for producing the apparatus, apparatus and method for detecting pointing information thereof
US20070113681A1 (en) * 2005-11-22 2007-05-24 Nishimura Ken A Pressure distribution sensor and sensing method
WO2011158154A2 (fr) 2010-06-15 2011-12-22 Aito B.V. Dispositif destiné à détecter la présence d'au moins un doigt humain sur une surface et procédé destiné à employer le dispositif dans l'interface utilisateur d'une machine, d'un dispositif (en particulier un dispositif portable) ou d'un système
US20130234734A1 (en) * 2012-03-09 2013-09-12 Sony Corporation Sensor unit, input device, and electronic apparatus
EP2662909A1 (fr) * 2012-05-08 2013-11-13 Aito B.V. Dispositif piézoélectrique
WO2014128640A2 (fr) 2013-02-20 2014-08-28 Aito Interactive Oy Capteur piézoélectrique, et appareil électrique, installation ou gadget comprenant au moins un capteur piézoélectrique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01166211A (ja) * 1987-12-23 1989-06-30 Oki Electric Ind Co Ltd 座標検出装置
US20030057808A1 (en) * 2001-09-27 2003-03-27 Samsung Electronics Co., Ltd. Pointing apparatus using piezoelectric film, method for producing the apparatus, apparatus and method for detecting pointing information thereof
US20070113681A1 (en) * 2005-11-22 2007-05-24 Nishimura Ken A Pressure distribution sensor and sensing method
WO2011158154A2 (fr) 2010-06-15 2011-12-22 Aito B.V. Dispositif destiné à détecter la présence d'au moins un doigt humain sur une surface et procédé destiné à employer le dispositif dans l'interface utilisateur d'une machine, d'un dispositif (en particulier un dispositif portable) ou d'un système
US20130234734A1 (en) * 2012-03-09 2013-09-12 Sony Corporation Sensor unit, input device, and electronic apparatus
EP2662909A1 (fr) * 2012-05-08 2013-11-13 Aito B.V. Dispositif piézoélectrique
WO2014128640A2 (fr) 2013-02-20 2014-08-28 Aito Interactive Oy Capteur piézoélectrique, et appareil électrique, installation ou gadget comprenant au moins un capteur piézoélectrique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3043952A1 (fr) * 2015-11-20 2017-05-26 Faurecia Interieur Ind Panneau de commande a capteur piezoelectrique souple pour un vehicule
US10024744B2 (en) 2015-11-20 2018-07-17 Faurecia Interieur Industrie Control panel with flexible piezoelectric sensor for a vehicle
US10599249B2 (en) 2016-02-29 2020-03-24 Koninklijke Philips N.V. Sensor device and sensing method based on an electroactive material
EP3282587A1 (fr) * 2016-08-12 2018-02-14 Big Kaiser Präzisionswerkzeuge Ag Appareil électronique ayant un dispositif à boutons
US10967434B2 (en) 2016-08-12 2021-04-06 Big Kaiser Präzisionswerkzeuge Ag Boring head with an electronic unit
WO2018038913A1 (fr) * 2016-08-24 2018-03-01 Knowles Electronics, Llc Interface utilisateur intégrant des extensomètres
CN107525720A (zh) * 2017-08-22 2017-12-29 成都理工大学 一种测试致密储层敏感性的装置及方法
US11789556B2 (en) 2019-03-07 2023-10-17 Aito Bv Touch detection device and method

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