WO2018066262A1 - Dispositif de détection de pression - Google Patents

Dispositif de détection de pression Download PDF

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Publication number
WO2018066262A1
WO2018066262A1 PCT/JP2017/030499 JP2017030499W WO2018066262A1 WO 2018066262 A1 WO2018066262 A1 WO 2018066262A1 JP 2017030499 W JP2017030499 W JP 2017030499W WO 2018066262 A1 WO2018066262 A1 WO 2018066262A1
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WO
WIPO (PCT)
Prior art keywords
pressing
electrode
pressing force
ratio
pressed
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Application number
PCT/JP2017/030499
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English (en)
Japanese (ja)
Inventor
森　健一
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株式会社村田製作所
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Priority to JP2018543775A priority Critical patent/JP6540905B2/ja
Publication of WO2018066262A1 publication Critical patent/WO2018066262A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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

Definitions

  • the present invention relates to a pressure detection device that detects a pressure operation on an operation surface.
  • a touch input device As a conventional press detection device, for example, there is a touch input device described in Patent Document 1.
  • electrodes are formed on both main surfaces of the polylactic acid film, and one electrode is divided into a plurality of parts.
  • the divided electrodes are connected to a processing unit that outputs position information and pressing information based on voltages detected independently from each other.
  • An object of the present invention is to provide a press detection device that determines a pressing force applied to a pressed position when a plurality of positions are pressed simultaneously.
  • the press detection device of the present invention includes an operation surface, a piezoelectric film distorted by a pressing operation on the operation surface, a plurality of first electrodes disposed on a first main surface of the piezoelectric film, and a second main electrode of the piezoelectric film.
  • a position detection unit for detecting a pressed position on the operation surface, and a plurality of positions on the operation surface are simultaneously pressed
  • “Simultaneously pressing” is not limited to pressing two locations at the same time, but includes pressing one location with a time difference while pressing one location. In this configuration, when a plurality of positions are pressed at the same time, the pressing force applied to the pressing position can be determined.
  • the calculation unit calculates a ratio of a pressing force applied to the pressing position based on a ratio of a voltage between the first electrode and the second electrode. In this configuration, when a plurality of positions are pressed at the same time, the ratio of the pressing force applied to the pressing positions can be calculated, so that a high-performance pressing detection device can be realized.
  • the calculation unit calculates a voltage ratio between the first electrode and the second electrode corresponding to the pressed position detected by the position detection unit when a plurality of positions on the operation surface are simultaneously pressed. Then, it is preferable to calculate the ratio of the pressing force by substituting the calculated value into a predetermined function. With this configuration, it is possible to reduce the calculation load when calculating the ratio of the pressing force.
  • the calculation unit calculates a total value of voltages between the first electrode and the second electrode, and based on the calculated total value and the pressing position detected by the position detection unit, the pressing The total value of the pressing force applied to the position may be calculated, and the pressing force applied to the pressing position may be calculated based on the calculated total value of the pressing force and the ratio of the pressing force. In this configuration, since the pressing force applied to the pressing position can be calculated, a higher-performance pressing detection device can be realized.
  • the pressing force applied to the pressing position can be determined.
  • FIG. 1 is an external perspective view of a press detection device 10 according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the pressure detection device 10 taken along the line AA.
  • FIG. 3 is a plan view of the capacitance sensor 14.
  • FIG. 4A is a plan view of the pressure detection electrode 26 and the PET film 27.
  • FIG. 4B is a plan view of the ground electrode 22 and the PET film 21.
  • FIG. 5 is a block diagram of the arithmetic circuit module 30.
  • FIG. 6 is a flowchart showing processing executed by the control unit 34.
  • FIG. 7 is a diagram showing the pressing position.
  • FIG. 8 is a diagram showing the pressing force applied to the position shown in FIG.
  • FIG. 9 is a diagram showing the potential of the pressure detection electrode 26 when the position shown in FIG.
  • FIG. 10 is a diagram showing a change in the ratio Pr F of the pressing force with respect to a change in the potential ratio R V when the positions shown in FIG. 7 are pressed simultaneously.
  • FIG. 11 is a diagram showing the pressing position.
  • FIG. 12 is a diagram showing a change in the pressing force ratio Pr F with respect to a change in the potential ratio R V when the positions shown in FIG. 11 are simultaneously pressed.
  • FIG. 13 is a block diagram of the arithmetic circuit module 40 according to the second embodiment.
  • FIG. 14 is a flowchart illustrating processing executed by the control unit 44.
  • FIG. 1 is an external perspective view of a press detection device 10 according to the first embodiment.
  • the press detection device 10 is an information processing device such as a smartphone.
  • the press detection device 10 includes a rectangular parallelepiped housing 11 and a planar surface panel 12 disposed in an opening on the upper surface of the housing 11 in appearance.
  • the surface panel 12 is made of, for example, glass, polyethylene terephthalate (PET), polycarbonate (PC), or an acrylic flat plate.
  • PET polyethylene terephthalate
  • PC polycarbonate
  • the upper surface of the front panel 12 functions as an operation surface on which a user operates using a finger, a pen, or the like.
  • the width direction (lateral direction) of the housing 11 is the X-axis direction
  • the length direction (vertical direction) is the Y-axis direction
  • the thickness direction is the Z-axis direction.
  • FIG. 2 is a cross-sectional view of the pressure detection device 10 taken along the line AA.
  • FIG. 3 is a plan view of the capacitance sensor 14.
  • FIG. 4A is a plan view of the pressure detection electrode 26 and the PET film 27.
  • FIG. 4B is a plan view of the ground electrode 22 and the PET film 21.
  • illustration of the extraction electrode connected to each detection electrode is omitted.
  • an adhesive 13, a capacitance sensor 14, an adhesive 15, and the like are arranged in the housing 11 along the Z-axis direction in order from the opening (surface panel 12) side of the housing 11.
  • a piezoelectric sensor 20, an adhesive 16, a liquid crystal display 17, and an arithmetic circuit module 30 are arranged.
  • the capacitance sensor 14, the piezoelectric sensor 20, and the liquid crystal display 17 have a flat plate shape and are arranged inside the casing 11 so as to be parallel to the opening (front panel 12) of the casing 11. .
  • the capacitance sensor 14 is attached to the lower surface of the front panel 12 via the adhesive 13.
  • a piezoelectric sensor 20 is attached to the lower surface of the capacitance sensor 14 via an adhesive 15.
  • a liquid crystal display 17 is attached to the lower surface of the piezoelectric sensor 20 via an adhesive 16.
  • a circuit board (not shown) is disposed between the bottom surface of the housing 11 and the liquid crystal display 17, and the arithmetic circuit module 30 is mounted on the circuit board.
  • the arithmetic circuit module 30 includes a CPU, a memory, a CPU peripheral circuit, and the like. Note that the present invention includes a configuration in which no liquid crystal display is arranged.
  • the capacitance sensor 14 includes a plurality of capacitance detection electrodes 141, a flat insulating substrate 142, and a plurality of capacitance detection electrodes 143.
  • the insulating substrate 142 is made of a transparent material, for example, a film made of PET or COP (cycloolefin polymer), a sheet or plate made of PC or PMMA (acrylic resin), or 0.1 mm to 0.7 mm. Made of thin glass.
  • a plurality of capacitance detection electrodes 141 are formed on the first main surface (upper surface side) of the insulating substrate 142. As shown in FIG. 3, the plurality of capacitance detection electrodes 141 have a rectangular shape that is long in one direction in plan view (viewed from the Z-axis direction), and the long direction is parallel to the Y-axis direction. Are arranged as follows. The plurality of capacitance detection electrodes 141 are arranged at predetermined intervals along the X-axis direction.
  • a plurality of capacitance detection electrodes 143 are formed on the second main surface (lower surface side) of the insulating substrate 142. As shown in FIG. 3, the plurality of capacitance detection electrodes 143 also have a rectangular shape that is long in one direction in plan view. The plurality of capacitance detection electrodes 143 are arranged so that the longitudinal direction is parallel to the X-axis direction. Such a plurality of capacitance detection electrodes 143 are arranged at predetermined intervals along the Y-axis direction.
  • the capacitance sensor 14 detects a change in capacitance that occurs when a user's finger approaches or comes into contact with the capacitance detection electrode 141 and the capacitance detection electrode 143.
  • positioning aspect of the electrode 141 for electrostatic capacitance detection and the electrode 143 for electrostatic capacitance detection is not restricted to this example.
  • the piezoelectric sensor 20 includes a PET film 21, a plurality of ground electrodes 22, an adhesive 23, a piezoelectric film 24, an adhesive 25, a plurality of press detection electrodes 26, and a PET film 27.
  • the first main surface (upper surface side) of the PET film 21 is affixed to the lower surface of the capacitance sensor 14 via the adhesive 15.
  • a ground electrode 22 is deposited on the second main surface (lower surface side) of the PET film 21.
  • a piezoelectric film 24 is attached to the ground electrode 22 via an adhesive 23.
  • a pressure detection electrode 26 is attached to the piezoelectric film 24 via an adhesive 25.
  • the pressure detection electrode 26 is deposited on a PET film 27.
  • the pressure detection electrode 26 is disposed on the first main surface (lower surface side) of the piezoelectric film 24.
  • the ground electrode 22 is disposed on the second main surface (upper surface side) of the piezoelectric film 24.
  • the pressure detection electrode 26 and the ground electrode 22 are examples of the “first electrode” and the “second electrode” in the present invention, respectively.
  • the ground electrode 22 is vapor-deposited on the PET film 21 and the pressure detection electrode 26 is vapor-deposited on the PET film 27.
  • the ground electrode 22 and the pressure detection electrode 26 are formed of a piezoelectric film. You may form directly on both main surfaces. In this case, a PET film or an adhesive between the piezoelectric film 24 and the ground electrode 22 and the pressure detection electrode 26 is unnecessary.
  • the plurality of press detection electrodes 26 are arranged on substantially the entire surface of the PET film 27 in plan view.
  • the pressure detection electrodes 26 are arranged in a matrix in plan view.
  • the pressure detection electrodes 26 are aligned in 5 rows and 3 columns in plan view.
  • the length of each pressing detection electrode 26 in the X-axis direction is equal to or greater than the width of the capacitance detection electrode 141.
  • the length of each press detection electrode 26 in the Y-axis direction is equal to or greater than the width of the capacitance detection electrode 143.
  • the plurality of ground electrodes 22 are formed on substantially the entire surface of the PET film 21 in plan view.
  • the ground electrodes 22 are arranged in a matrix in plan view.
  • the ground electrodes 22 are aligned in 5 rows and 3 columns in plan view.
  • the ground electrode 22 and the pressure detection electrode 26 are opposed to each other via the piezoelectric film 24.
  • the ground electrode may be composed of one electrode that is not divided into a plurality of parts.
  • the ground electrode 22 and the pressure detection electrode 26 are all made of a transparent material, for example, a material mainly composed of indium tin oxide (ITO), zinc oxide (ZnO), or polythiophene.
  • ITO indium tin oxide
  • ZnO zinc oxide
  • polythiophene polythiophene
  • the structure does not include a display device such as a liquid crystal display or a structure in which a piezoelectric sensor is disposed on the back surface of the display device, it may be non-transparent, such as copper (Cu) or silver (Ag).
  • the piezoelectric film 24 is distorted by a pressing operation with respect to the operation surface of the front panel 12, generates electric charges in the respective pressing detection electrodes 26, and changes the potential of the respective pressing detection electrodes 26.
  • Such a piezoelectric film 24 is preferably made of a highly transparent chiral polymer. More preferably, it is uniaxially stretched polylactic acid (PLA), more preferably L-type polylactic acid (PLLA).
  • PLA uniaxially stretched polylactic acid
  • PLLA L-type polylactic acid
  • a chiral polymer has a helical structure in its main chain, and has a piezoelectric property when oriented uniaxially and molecules are oriented. The amount of charge generated by the uniaxially stretched chiral polymer is uniquely determined by the amount of displacement of the surface panel 12 in the normal direction.
  • the piezoelectric constant of uniaxially stretched PLLA belongs to a very high class among polymers. That is, it is possible to detect a pressing operation with high sensitivity and to output a deformation detection signal corresponding to the pressing amount with high accuracy.
  • the piezoelectric film 24 is disposed such that the uniaxial stretching direction forms an angle of approximately 45 ° with respect to the X-axis direction and the Y-axis direction. By performing such an arrangement, the pressing operation can be detected with higher sensitivity.
  • the control unit 34 controls the overall operation of the arithmetic circuit module 30. As will be described later, when the plurality of positions on the operation surface of the front panel 12 are pressed at the same time, the control unit 34 compares the potential R of the pressure detection electrode 26 corresponding to the pressed position detected by the position detection unit 36. Based on V , the ratio R F of the pressing force applied to the pressing position is calculated. More specifically, the control unit 34 calculates the ratio R V of the potential of the pressure detection electrode 26 corresponding to the pressure position detected by the position detection unit 36, and substitutes the calculated value for a predetermined function f. To calculate the ratio R F of the pressing force. “Simultaneously pressing” is not limited to pressing two locations at the same time, but includes pressing one location with a time difference while pressing one location. The control unit 34 includes the “calculation unit” of the present invention.
  • the storage unit 35 stores a program executed by the arithmetic circuit module 30 and sequentially stores arithmetic processing results and the like.
  • the storage unit 35 stores a plurality of functions f determined according to the combination of the pressed positions. More specifically, the storage unit 35 stores the slope and intercept of the function f represented by a linear function. Details of the function f will be described later.
  • the display processing unit 33 displays an image on the liquid crystal display 17 based on the control of the control unit 34.
  • FIG. 6 is a flowchart showing processing executed by the control unit 34.
  • the pressed position is acquired from the position detector 36 (S11).
  • S12: Yes the potential V 1 of the pressing detection electrode 26 corresponding to the one pressing position P 1 acquired from the potential detecting unit 32 and the other pressing acquired.
  • the potential V 2 of the pressure detection electrode 26 corresponding to the position P 2 is acquired (S13).
  • the potential ratio R V is calculated (S14).
  • R V V 1 / V 2 .
  • the ratio R V of the calculated potential by substituting the previously stored function f in the storage unit 35, calculates the ratio Pr F of the pressing force (S15).
  • Pr F F 1 / F.
  • F 1 is a pressing force applied to the pressing position P 1 .
  • FIG. 10 is a diagram showing a change in the ratio Pr F of the pressing force with respect to a change in the potential ratio R V when the positions shown in FIG. 7 are pressed simultaneously.
  • FIG. 10 is obtained from the results shown in FIGS.
  • the function f is expressed by a linear function that is determined according to the combination of the pressed positions.
  • a plurality of functions f determined in accordance with the combination of the pressing positions are stored in the storage unit 35 in advance, so that the ratio Pr F of the pressing force is calculated from the potential ratio R V no matter what position is pressed. Is done. It should be noted that the present invention is not limited to the linear function formula described above, and any relationship between the pressing force ratio Pr F and the potential ratio R V can be included in the present invention.
  • the pressing force ratio Pr F is about 0.5, and as a result, the pressing force ratio R F is about 1.
  • the accuracy can be further increased by detecting the pressing in light of a function suitable for the position.
  • FIG. 13 is a block diagram of the arithmetic circuit module 40 according to the second embodiment.
  • the control unit 44 calculates the pressing force at each pressed position.
  • the storage unit 45 stores in advance a function, a table, and the like that associate the total pressing force F with a combination of a total potential and a pressing position of a later-described pressing detection electrode 26.
  • FIG. 14 is a flowchart illustrating processing executed by the control unit 44.
  • the pressed position is acquired from the position detector 36 (S21).
  • the potentials of all the pressing detection electrodes 26 are acquired from the potential detection unit 32 (S23).
  • the total potential of the pressure detection electrode 26 is calculated (S24).
  • the total potential of the pressure detection electrode 26 is the total value of the potentials of all the pressure detection electrodes 26 acquired from the potential detection unit 32.
  • the total pressing force F is calculated by applying a function, a table, or the like stored in advance in the storage unit 45 to the combination of the calculated total potential of the pressing detection electrode 26 and the acquired pressing position. (S25).
  • the pressing force at each pressing position is calculated, so that a higher-performance touch panel can be realized.
  • the pressing position is detected by the capacitance method.
  • the pressing position may be detected by a resistance film method, a membrane switch, or the like.
  • the function f that associates the pressing force ratio Pr F with the potential ratio R V is expressed by a linear function.
  • the fifth row A column (hereinafter referred to as 5-A)
  • the gap between the pressure detection electrode and the fifth row B column (hereinafter referred to as 5-B) pressure detection electrode and the 5-B pressure detection electrode and the fifth row C column (hereinafter referred to as 5-C)
  • an average value of a function of 5-A and 5-B and a function of 5-B and 5-C may be used.
  • store can be reduced.

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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)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Position Input By Displaying (AREA)

Abstract

L'invention concerne un dispositif de détection de pression (10) comprenant : une surface de fonctionnement ; un film piézoélectrique (24) qui se déforme en raison d'une opération de pression sur la surface de fonctionnement ; une pluralité de premières électrodes (26) disposée sur une première surface principale du film piézoélectrique (24); au moins une seconde électrode (22) faisant face aux premières électrodes (26) et disposée sur une seconde surface principale du film piézoélectrique (24); une unité de détection de position pour détecter une position de pression sur la surface de fonctionnement ; et une unité de calcul pour calculer une force de pression correspondant à la position de pression détectée par l'unité de détection de position lorsqu'une pluralité de positions sur la surface de fonctionnement sont pressées en même temps.
PCT/JP2017/030499 2016-10-06 2017-08-25 Dispositif de détection de pression WO2018066262A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018543775A JP6540905B2 (ja) 2016-10-06 2017-08-25 押圧検出装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-197961 2016-10-06
JP2016197961 2016-10-06

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WO2018066262A1 true WO2018066262A1 (fr) 2018-04-12

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012049969A1 (fr) * 2010-10-15 2012-04-19 株式会社村田製作所 Dispositif d'entrée tactile et son procédé de fabrication
WO2012153555A1 (fr) * 2011-05-12 2012-11-15 アルプス電気株式会社 Dispositif d'entrée et procédé de détection de charge multipoint employant le dispositif d'entrée
JP2015038689A (ja) * 2013-08-19 2015-02-26 パナソニック株式会社 入力装置および電子機器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012049969A1 (fr) * 2010-10-15 2012-04-19 株式会社村田製作所 Dispositif d'entrée tactile et son procédé de fabrication
WO2012153555A1 (fr) * 2011-05-12 2012-11-15 アルプス電気株式会社 Dispositif d'entrée et procédé de détection de charge multipoint employant le dispositif d'entrée
JP2015038689A (ja) * 2013-08-19 2015-02-26 パナソニック株式会社 入力装置および電子機器

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JPWO2018066262A1 (ja) 2019-06-27
JP6540905B2 (ja) 2019-07-10

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