WO2016117434A1 - Module de capteur, dispositif de détection de pression - Google Patents

Module de capteur, dispositif de détection de pression Download PDF

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Publication number
WO2016117434A1
WO2016117434A1 PCT/JP2016/050896 JP2016050896W WO2016117434A1 WO 2016117434 A1 WO2016117434 A1 WO 2016117434A1 JP 2016050896 W JP2016050896 W JP 2016050896W WO 2016117434 A1 WO2016117434 A1 WO 2016117434A1
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Prior art keywords
amplifier circuit
charge
voltage
output voltage
amplifier
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Application number
PCT/JP2016/050896
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English (en)
Japanese (ja)
Inventor
山口喜弘
木原尚志
遠藤潤
斉藤誠人
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株式会社村田製作所
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2016570591A priority Critical patent/JP6252695B2/ja
Publication of WO2016117434A1 publication Critical patent/WO2016117434A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/70—Charge amplifiers

Definitions

  • the present invention relates to a sensor module that detects a physical quantity such as a pressing force by converting it into an electric charge and a voltage, and a press detection device including the sensor module.
  • the sensor detection circuit of Patent Document 1 includes a piezoelectric element, a charge amplifier, and an amplifier circuit.
  • the output end of the piezoelectric element is connected to a charge amplifier.
  • the charge amplifier converts the amount of charge detected by the piezoelectric element into a voltage signal and outputs the voltage signal to the amplifier circuit.
  • the amplifier circuit amplifies and outputs the voltage signal.
  • an object of the present invention is to provide a sensor module capable of realizing a wide dynamic range and a press detection device including the sensor module.
  • the sensor module of the present invention includes a piezoelectric element, a charge amplifier, an amplifier circuit, a logarithmic amplifier circuit, and an arithmetic unit.
  • the piezoelectric element generates a charge amount corresponding to the pressing force.
  • the charge amplifier converts the amount of charge into a voltage.
  • the amplifier circuit amplifies the output voltage of the charge amplifier.
  • the logarithmic amplifier circuit uses the output voltage of the amplifier circuit as an input voltage.
  • the calculation unit detects the pressing force using the output voltage of the logarithmic amplifier circuit.
  • the sensor module of the present invention preferably has one of the following configurations.
  • the charge amplifier outputs a negative voltage with respect to the pressing in the detection direction, and the amplifier circuit is an inverting amplifier circuit.
  • the charge amplifier outputs a positive voltage with respect to pressing in the detection direction, and the amplifier circuit is a non-inverting amplifier circuit.
  • the rise (fall) of the output voltage of the logarithmic amplifier circuit is the same as the initial timing when the object is pressed. Therefore, it is possible to reliably and easily detect the timing when the object is pressed.
  • the sensor module of the present invention may have the following configuration.
  • the sensor module includes a piezoelectric element, a charge amplifier, a logarithmic amplifier circuit, and a calculation unit.
  • the piezoelectric element generates a charge amount corresponding to the pressing force.
  • the charge amplifier converts the amount of charge into a voltage.
  • the logarithmic amplifier circuit performs logarithmic amplification using the output voltage of the charge amplifier as an input voltage.
  • the calculation unit detects the pressing force using the output voltage of the logarithmic amplifier circuit.
  • the charge amplifier outputs a positive voltage with respect to pressing in the detection direction.
  • the sensor module can be realized with a simpler configuration.
  • the logarithmic amplifier circuit preferably includes a temperature compensation element.
  • the pressing force can be accurately detected without being affected by the temperature.
  • the sensor module of the present invention preferably includes calibration means for calibrating the output voltage of the logarithmic amplifier circuit using a reference potential applied to the logarithmic amplifier circuit.
  • the logarithmic amplifier circuit can be easily calibrated.
  • the press detection device of the present invention includes the above-described sensor module.
  • the pressure detection device includes a plurality of sets of piezoelectric elements, charge amplifiers, logarithmic amplification circuits, and logarithmic amplification circuits, and a detection member in which the plurality of piezoelectric elements are arranged apart from each other.
  • the arithmetic unit converts the output voltage of the logarithmic amplifier circuit from analog to digital, and detects the pressed position using the ratio of the output voltages of at least one pair of logarithmic amplifier circuits.
  • a desired physical quantity detected by electric charge can be detected with a wide dynamic range.
  • a sensor module that detects a pressure by converting a pressure into a voltage will be described as an example.
  • the present invention can be applied to a sensor module that converts another physical quantity into a voltage and detects the voltage.
  • it is particularly effective to apply to a sensor module in which the amount of charge changes due to a change in physical quantity, and the change in charge amount is detected by converting it into a voltage.
  • FIG. 1 is a block diagram showing a configuration of a sensor module according to the first embodiment of the present invention.
  • FIG. 2 is a plan view showing the arrangement of the piezoelectric elements in the press detection device according to the first embodiment of the present invention.
  • the sensor module 1 includes piezoelectric elements 101, 102, 103, 104 and a detection circuit 10.
  • the detection circuit 10 includes charge amplifiers 21, 22, 23, 24, amplifier circuits 31, 32, 33, 34, logarithmic amplifier circuits 41, 42, 43, 44, and a calculation unit 50.
  • Piezoelectric elements 101-104 generate a charge amount corresponding to the pressing force.
  • the detection circuit 10 converts the amount of charge generated in the piezoelectric elements 101-104 into a voltage, and detects the pressing force and the pressing position from the voltage.
  • the piezoelectric elements 101 to 104 include, for example, a piezoelectric film and a detection conductor formed on the piezoelectric film.
  • a piezoelectric film consists of a rectangular flat film provided with the 1st main surface and 2nd main surface which mutually oppose.
  • the detection conductor is disposed on the first main surface and the second main surface of the piezoelectric film.
  • the piezoelectric film is made of uniaxially stretched L-type polylactic acid (PLLA).
  • PLLA is a chiral polymer, and the main chain has a helical structure.
  • PLLA produces piezoelectricity when molecules are oriented by uniaxial stretching or the like.
  • the piezoelectric constant of uniaxially stretched PLLA belongs to a very high class among polymers.
  • the draw ratio is preferably about 3 to 8 times.
  • PLLA generates piezoelectricity by molecular orientation processing such as stretching, and there is no need to perform poling processing like other polymers such as PVDF and piezoelectric ceramics. That is, the piezoelectricity of PLLA that does not belong to ferroelectrics is not expressed by the polarization of ions like ferroelectrics such as PVDF and PZT, but is derived from a helical structure that is a characteristic structure of molecules. is there. For this reason, the pyroelectricity generated in other ferroelectric piezoelectric materials does not occur in PLLA. Further, PVDF or the like shows a change in piezoelectric constant over time, and in some cases, the piezoelectric constant may be significantly reduced, but the piezoelectric constant of PLLA is extremely stable over time.
  • the detection conductor is preferably an organic electrode composed mainly of ITO, ZnO or polythiophene, an organic electrode composed mainly of polyaniline, or a silver nanowire electrode. By using these materials, an electrode with high translucency can be formed. When transparency is not required, an electrode formed of silver paste, or a metal electrode formed by vapor deposition, sputtering, plating, or the like can be used.
  • the piezoelectric elements 101-104 are affixed to the detection member 110. More specifically, the detection member 110 is a flat plate having a predetermined rigidity. The surface of the detection member 110 is a pressure detection surface. The piezoelectric elements 101-104 have a long shape. When the piezoelectric film of the piezoelectric elements 101-104 is formed of PLLA, the uniaxial stretching direction is preferably about 45 ° with respect to the longitudinal direction.
  • Piezoelectric elements 101-104 are arranged along the outer periphery of the detection member 110 in plan view.
  • the piezoelectric element 101 is disposed in the vicinity of one side along one side of the detection member 110 in plan view.
  • the piezoelectric element 102 is arranged in the vicinity of this side along a side parallel to and opposite to the side where the piezoelectric element 101 of the detection member 110 is arranged.
  • the longitudinal direction of the piezoelectric elements 101 and 102 is orthogonal to the arrangement direction of these piezoelectric elements 101 and 102 (Y-axis direction in FIG. 2).
  • the charge amplifier 21 includes an operational amplifier U21, a resistor R21, and a capacitor C21.
  • the inverting input terminal of the operational amplifier U21 is connected to one detection conductor of the piezoelectric element 101.
  • the other detection conductor of the piezoelectric element 101 is connected to a constant potential such as a ground potential.
  • the charge amplifier 21 converts the amount of charge QC21 generated in the piezoelectric element 101 into the voltage Vout21.
  • the output voltage Vout21 of the charge amplifier 21 is obtained by the following equation.
  • C in the following equation is the capacitance of the capacitor C21, and R in the following equation is the pure resistance of the resistor R21.
  • Q represents the amount of charge QC21 generated in the piezoelectric element 101. Further, the frequency of change of the charge amount Q is assumed to be f.
  • the output voltage Vout21 of the charge amplifier 21 is input to the amplifier circuit 31.
  • the output voltage Vout22 of the charge amplifier 22 is input to the amplifier circuit 32.
  • the output voltage Vout23 of the charge amplifier 23 is input to the amplifier circuit 33.
  • the output voltage Vout24 of the charge amplifier 24 is input to the amplifier circuit 34.
  • the amplifier circuits 31, 32, 33, and 34 are inverting amplifier circuits.
  • FIG. 4 is a circuit diagram of the amplifier circuit of the sensor module according to the first embodiment of the present invention.
  • the amplifier circuits 31-34 have the same circuit configuration. Therefore, the amplifier circuit 31 will be described as an example.
  • the amplifier circuit 31 includes an operational amplifier U31 and resistors R311 and R312.
  • a resistor R311 is connected to the inverting input terminal of the operational amplifier U31.
  • the resistor R311 is connected to the output terminal of the charge amplifier 21.
  • the non-inverting input terminal of the operational amplifier U31 is connected to the reference potential V STD .
  • the output terminal of the operational amplifier U31 is connected to the inverting input terminal of the operational amplifier U31 via a resistor R312.
  • the amplification factor is set by the ratio (R312 / R311) of the pure resistance of the resistor R311 and the pure resistance of the resistor R312.
  • the amplifier circuit 31 amplifies the input voltage Vin31 (the output voltage Vout21 of the charge amplifier 21) and outputs the output voltage Vout31.
  • the polarity of the output voltage Vout31 is inverted with respect to the polarity of the input voltage Vin31.
  • the output voltage Vout31 of the amplifier circuit 31 is the input voltage Vin31.
  • Vout31 ⁇ (R312 / R311) Vin31 ⁇ (Formula 3) It becomes.
  • the output voltage Vout31 of the amplifier circuit 31 is input to the logarithmic amplifier circuit 41.
  • the output voltage Vout32 of the amplifier circuit 32 is input to the logarithmic amplifier circuit.
  • the output voltage Vout33 of the amplifier circuit 33 is input to the logarithmic amplifier circuit 43.
  • the output voltage Vout34 of the amplifier circuit 34 is input to the logarithmic amplifier circuit 44.
  • FIG. 5 is a circuit diagram of a logarithmic amplifier circuit of the sensor module according to the first embodiment of the present invention.
  • the logarithmic amplifier circuits 41-44 have the same circuit configuration. Therefore, the logarithmic amplifier circuit 41 will be described as an example.
  • the logarithmic amplifier circuit 41 includes operational amplifiers U41 and U42, transistors Q41 and Q42, resistors R411, R412, R412, R414, and R415, and capacitors C41 and C42.
  • the inverting input terminal of the operational amplifier U41 is connected to the resistor R411.
  • the resistor R411 is connected to the output terminal of the amplifier circuit 31. Therefore, the output voltage Vout31 of the amplifier circuit 31 is the input voltage Vin41 of the logarithmic amplifier circuit 41.
  • the non-inverting input terminal of the operational amplifier U41 is connected to the reference potential V STD .
  • the output terminal of the operational amplifier U41 is connected to the base of the transistor Q42 via a resistor R415.
  • the output terminal of the operational amplifier U41 is connected to the inverting input terminal of the operational amplifier U41 via the capacitor C41.
  • the inverting input terminal of the operational amplifier U42 is connected to the resistor R412. Resistor R412 is connected to the reference potential V REF. The non-inverting input terminal of the operational amplifier U42 is connected to the reference potential V STD . Incidentally, by the reference potential V REF and the driving voltage V DD, even without adding new voltage generating circuit for the reference potential V REF, it can be easily obtained reference potential V REF.
  • the output terminal of the operational amplifier U42 is connected to the input terminal of the operational amplifier U42 via the capacitor C42.
  • the operational amplifier U42 is connected to a connection point between the emitter of the transistor Q41 and the emitter of the transistor Q42 via a resistor R413.
  • the collector of the transistor Q41 is connected to the inverting input terminal of the operational amplifier U41.
  • the collector of the transistor Q42 is connected to the inverting input terminal of the operational amplifier U42.
  • the base of the transistor Q41 is connected to the reference potential.
  • the base of the transistor Q42 is connected to the reference potential via the resistor R414.
  • the voltage at the output terminal of the operational amplifier U41 is the output voltage Vout41 of the logarithmic amplifier circuit 41.
  • the output voltage Vout41 of the logarithmic amplifier circuit 41 is set as the input voltage Vin41.
  • Vout41 ⁇ (nkT (R415 + R414) / (q ⁇ R414)) ⁇ log 10 (R412 ⁇ Vin41 / R411 ⁇ V REF ) ⁇ (Formula 4) It becomes.
  • n is an emission coefficient
  • k is a Boltzmann constant
  • q is an electron charge amount.
  • FIG. 6 is a diagram illustrating waveforms of each part of the sensor module according to the first embodiment of the present invention.
  • the amount of charge input to the charge amplifier 21 becomes a positive value.
  • the change in the charge amount is the same as the change in the pressing force. For example, when a pressing force is generated and increased, the amount of charge also increases. If the pressing force is constant, the charge amount does not change and is constant. When the pressing force decreases, the charge amount decreases.
  • the output voltage Vout2 of the charge amplifier 21 decreases from the reference potential V STD according to the increase amount and the increase speed.
  • the amount of decrease in the output voltage Vout2 of the charge amplifier 21 depends on the amount of charge, and in turn depends on the pressing force.
  • the output voltage Vout2 of the charge amplifier 21 returns to the reference potential V STD as the pressing force becomes constant.
  • the output voltage Vout2 of the charge amplifier 21 increases from the reference potential V STD according to the decrease amount and the decrease rate.
  • the output voltage Vout2 of the charge amplifier 21 returns to the reference potential V STD as the pressing force to the detection member 110 is released.
  • the amplifier circuit 31 amplifies the output voltage Vout2 of the charge amplifier 21 and inverts the polarity. Therefore, a period in which the charge amount is increased, the output voltage Vout3 of the amplifier circuit 31 rises from the reference potential V STD.
  • the absolute value of the increase amount of the output voltage Vout3 of the amplifier circuit 31 is larger than the absolute value of the decrease amount of the output voltage Vout2 of the charge amplifier 21.
  • a period in which the amount of electric charge decreases, the output voltage Vout3 of the amplifier circuit 31 is reduced from the reference potential V STD.
  • the absolute value of the decrease amount of the output voltage Vout3 of the amplifier circuit 31 is larger than the absolute value of the increase amount of the output voltage Vout2 of the charge amplifier 21.
  • the output voltage Vout4 of the logarithmic amplifier circuit 41 is substantially the same as the drive voltage V DD when no pressing force is applied to the detection member 110.
  • the drive voltage V DD is a drive voltage applied to the operational amplifiers U41 and U42 constituting the logarithmic amplifier circuit 41.
  • the output voltage Vout4 of the logarithmic amplifier circuit 41 decreases from the drive voltage V DD to near the reference voltage V STD as the output voltage Vout3 of the amplifier circuit 31 increases.
  • the calculation unit 50 digitally samples the output voltages of the logarithmic amplifier circuits 41, 42, 43, and 44, and obtains them as detection values for the piezoelectric elements 101-104.
  • the computing unit 50 calculates the pressing force based on the detected value.
  • the configuration of the present embodiment it is possible to detect the timing at which the pressing force is applied from the state where the pressing force is not applied. Thereby, it can be detected that there is a press with almost no time lag in accordance with the press operation.
  • each of the plurality of stages may include both an inverting amplifier circuit and a non-inverting amplifier circuit, but an inverting / inverting amplifier circuit is necessarily included in an odd number.
  • the number of stages of the non-inverting amplifier circuit is not limited, and the non-inverting amplifier circuit may not be included.
  • the amplification circuit composed of a plurality of stages is inverted and amplified.
  • temperature compensation can be performed by using the resistor R415 in the logarithmic amplifier circuit 41 of the present embodiment as a thermistor. Thereby, the temperature dependence of the output voltage Vout41 of the logarithmic amplifier circuit 41 can be suppressed. Therefore, the presence / absence of the pressing force and the pressing force can be detected without being affected by the arrangement environment.
  • the pressed position can be detected by using the configuration of the present embodiment.
  • FIG. 7 is a graph showing the relationship between the pressing position and the output voltage ratio in the pressing detection device according to the first embodiment of the present invention.
  • the vertical axis represents a common logarithm (logarithm with a base of 10) of the ratio of the voltage V101 according to the output charge amount of the piezoelectric element 101 and the voltage V102 according to the output charge amount of the piezoelectric element 102.
  • the horizontal axis indicates the distance from the center of the detection member 110 in the Y-axis direction.
  • the value of the Y axis becomes positive on the piezoelectric element 101 side from the center in the Y axis direction in FIG.
  • the value of the Y axis is negative on the piezoelectric element 102 side from the center in the Y axis direction in FIG.
  • the position along the Y-axis direction and the common logarithm of the ratio between the voltage V101 and the voltage V102 are linear.
  • the calculation unit 50 calculates a difference (Vout41 ⁇ Vout42) between the output voltage Vout41 and the output voltage Vout42, thereby obtaining a value having a linear relationship with the common logarithm of the ratio between the voltage V101 and the voltage V102. it can.
  • the calculation unit 50 calculates the difference (Vout41 ⁇ Vout42) between the output voltage Vout41 and the output voltage Vout42.
  • the position of the Y axis in the member 110 can be detected.
  • the arithmetic unit 50 calculates the difference (Vout43 ⁇ Vout44) between the output voltage Vout43 of the logarithmic amplifier circuit 43 and the output voltage Vout44 of the logarithmic amplifier circuit 44, so that the X-axis direction is the same as the Y-axis direction position. Can be calculated.
  • the pressed position can be detected by using the configuration of this embodiment.
  • the calculation unit 50 may perform a difference calculation of the output voltages of the logarithmic amplifier circuits 41-44. Therefore, the pressed position can be detected by a simple calculation.
  • FIG. 8 is a circuit diagram of the charge amplifier of the sensor module according to the second embodiment of the present invention.
  • the charge amplifier 21A has a non-inverting input terminal connected to the piezoelectric element 101.
  • the non-inverting input terminal is connected to the reference potential V STD through a parallel circuit of a capacitor C21A and a resistor R21A.
  • the output terminal is connected to the inverting input terminal.
  • a non-inverting amplifier circuit is used as the amplifier circuit between the charge amplifier and the logarithmic amplifier circuit.
  • the amplifier circuit may have a plurality of stages. In each of the plurality of stages, either an inverting amplifier circuit or a non-inverting amplifier circuit may be used, but the inverting amplifier circuit included in the plurality of stages is either an even stage or not included. .
  • the number of stages of the non-inverting amplifier circuit is not limited, and the non-inverting amplifier circuit may not be included.
  • the amplification circuit composed of a plurality of stages is non-inverted and amplified.
  • a sensor module with a wide dynamic range can be realized as in the first embodiment. Further, it is possible to realize a press detection device that can accurately detect the presence / absence of the press, the pressing force, and the pressing position.
  • FIG. 9 is a block diagram showing a part of a sensor module according to the third embodiment of the present invention.
  • the sensor module according to this embodiment is different from the sensor module according to the first embodiment in that a switch circuit is provided between an amplifier circuit and a logarithmic amplifier circuit for one piezoelectric element.
  • the circuit for the other piezoelectric elements is the same.
  • a switch circuit 60 is connected between the output terminal of the amplifier circuit 31 and the input terminal of the logarithmic amplifier circuit 41.
  • the switch circuit 60 selectively connects the input terminal of the logarithmic amplifier circuit 41 to the output terminal of the amplifier circuit 31 or the reference potential VREF applied to the logarithmic amplifier circuit 41.
  • the arithmetic unit 50 connects the input terminal of the logarithmic amplifier circuit 41 to the output terminal of the amplifier circuit 31. Further, resistors having the same resistance value are used as the resistors R411 and R412 of the logarithmic amplifier circuit 41.
  • the arithmetic unit 50 controls the switch circuit 60 to connect the input terminal of the logarithmic amplifier circuit 41 to the reference potential V REF .
  • Vout41 0.
  • Vout41 becomes possible calibration of the reference potential V STD in the calculating portion by is equal to the reference potential V STD.
  • one of the amplifier circuits may be a rail-to-rail operational amplifier.
  • the drive voltage V DD can be input to the logarithmic amplifier circuit.
  • the reference potential V REF of the logarithmic amplifier circuit 41 is set as the drive potential V DD , the variation in the reference potential V STD can be calibrated as described above.
  • a method for generating the maximum output voltage for example, a large pressing force may be applied to the piezoelectric element, and the output voltage at this time may be stored.
  • the amplifier circuit 31 is configured by an operational amplifier.
  • the amplifier circuit may be configured by a combination of a transistor and a resistor.
  • FIG. 10 is a circuit diagram of an amplifier circuit according to another aspect of the sensor module according to the embodiment of the present invention.
  • the amplifier circuit 31A includes an npn transistor Q31A, resistors R311A, R312A, R313A, R314A, and capacitors C311A, C312A.
  • the input voltage Vin31A is applied to the base of the transistor Q31A via the capacitor C11A.
  • the base of the transistor Q31A is connected to the drive potential V DD via the resistor R311A, and is connected to the reference potential V STD via the resistor R312A.
  • the emitter of the transistor Q31A is connected to the reference potential V STD via the resistor R314A.
  • the collector of the transistor Q31A is connected to the drive voltage potential V DD via the resistor R313A.
  • the collector of transistor Q31A is connected to the subsequent stage via capacitor 312A. That is, the collector potential of the transistor Q31A becomes the output voltage Vout31A.
  • the output voltage Vout31A can be expressed by the following equation.
  • G is a positive real number.
  • Vout31A ⁇ G ⁇ Vin31A ⁇ (Formula 7)
  • the amplification factor of the amplifier circuit may be 1 or less (equal magnification or attenuation).
  • the amplifier circuit may be omitted when the output voltage from is a positive voltage with respect to the pressing in the detection direction.
  • sensor module 10 detection circuits 21, 22, 23, 24: charge amplifiers 31, 32, 33, 34, 31A: amplifier circuits 41, 42, 43, 44: logarithmic amplifier circuit 50: arithmetic unit 60: switch circuit 101 , 102, 103, 104: Piezoelectric element 110: Detection members C21, C21A, C41, C42, C312A, C312B: Capacitors R21, R21A, R311, R312, R311A, R312A, R313A, R314A, R411, R412, R413, R414 : Resistance R415: Resistance (thermistor) Q21, Q22, Q31A: transistors U21, U31, U41, U42: operational amplifiers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un module de capteur (1) qui est pourvu d'éléments piézoélectriques (101-104) et d'un circuit de détection (10). Le circuit de détection (10) est muni d'amplificateurs de charge (21-24), de circuits amplificateurs (31-34), de circuits amplificateurs logarithmiques (41-44), et d'une unité de calcul (50). Les éléments piézoélectriques (101-104) génèrent une charge électrique en réponse à une force de pression. Les amplificateurs de charge (21-24) convertissent une charge électrique en tension. Les circuits amplificateurs (31-34) amplifient la tension de sortie provenant des amplificateurs de charge. Les circuits amplificateurs logarithmiques (41-44) utilisent la tension de sortie provenant des circuits amplificateurs (31-34) comme tension d'entrée et fournissent en sortie une tension amplifiée logarithmiquement. L'unité de calcul (50) utilise la tension de sortie provenant des circuits amplificateurs logarithmiques (41-44) pour détecter la force de pression.
PCT/JP2016/050896 2015-01-20 2016-01-14 Module de capteur, dispositif de détection de pression WO2016117434A1 (fr)

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JP2016570591A JP6252695B2 (ja) 2015-01-20 2016-01-14 押圧検出装置

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JP2015008453 2015-01-20
JP2015-008453 2015-01-20

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WO2016117434A1 true WO2016117434A1 (fr) 2016-07-28

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153653A (en) * 1976-06-16 1977-12-20 Matsushita Electric Ind Co Ltd Logarithmic amplifier
JPS53114495A (en) * 1976-10-18 1978-10-05 Idec Izumi Corp Tester for moisture in chaff
JPH02503832A (ja) * 1987-06-12 1990-11-08 イーストマン・コダック・カンパニー 一体化した反射密度測定装置を含む写真プリンタ
JPH03295431A (ja) * 1990-04-13 1991-12-26 Honda Motor Co Ltd 半導体センサ
JP2013015444A (ja) * 2011-07-05 2013-01-24 Akebono Brake Ind Co Ltd 信号処理装置、信号処理方法、及び信号処理プログラム
WO2014196360A1 (fr) * 2013-06-04 2014-12-11 日本写真印刷株式会社 Capteur piézoélectrique et dispositif électronique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9261418B2 (en) * 2013-03-12 2016-02-16 Interlink Electronics, Inc. Systems and methods for common mode signal cancellation in press detectors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153653A (en) * 1976-06-16 1977-12-20 Matsushita Electric Ind Co Ltd Logarithmic amplifier
JPS53114495A (en) * 1976-10-18 1978-10-05 Idec Izumi Corp Tester for moisture in chaff
JPH02503832A (ja) * 1987-06-12 1990-11-08 イーストマン・コダック・カンパニー 一体化した反射密度測定装置を含む写真プリンタ
JPH03295431A (ja) * 1990-04-13 1991-12-26 Honda Motor Co Ltd 半導体センサ
JP2013015444A (ja) * 2011-07-05 2013-01-24 Akebono Brake Ind Co Ltd 信号処理装置、信号処理方法、及び信号処理プログラム
WO2014196360A1 (fr) * 2013-06-04 2014-12-11 日本写真印刷株式会社 Capteur piézoélectrique et dispositif électronique

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