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WO2017014452A1 - Button device using piezoelectric element - Google Patents

Button device using piezoelectric element Download PDF

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Publication number
WO2017014452A1
WO2017014452A1 PCT/KR2016/007287 KR2016007287W WO2017014452A1 WO 2017014452 A1 WO2017014452 A1 WO 2017014452A1 KR 2016007287 W KR2016007287 W KR 2016007287W WO 2017014452 A1 WO2017014452 A1 WO 2017014452A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric element
piezoelectric
cover
piezoelectric body
button device
Prior art date
Application number
PCT/KR2016/007287
Other languages
French (fr)
Korean (ko)
Inventor
최요셉
최재형
노로유키히로
김봉수
Original Assignee
주식회사 와이솔
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
Priority claimed from KR1020150102293A external-priority patent/KR102193906B1/en
Priority claimed from KR1020150110930A external-priority patent/KR102193908B1/en
Application filed by 주식회사 와이솔 filed Critical 주식회사 와이솔
Publication of WO2017014452A1 publication Critical patent/WO2017014452A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/703—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by spacers between contact carrying layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/704—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by the layers, e.g. by their material or structure

Definitions

  • the present invention relates to a button device, and more particularly to a button device using a piezoelectric element.
  • a button using a piezoelectric element has been in the spotlight as a user interface of a mobile phone, a game machine, a home appliance, or an elevator button or a switch in a building.
  • a piezoelectric element is a device that utilizes a piezoelectric effect, and refers to an element having a property of causing electric polarization when an external force (or contact) is applied to cause a potential difference, and conversely, deformation or deformation force when a voltage is applied.
  • a button using a piezoelectric element may not only function as an input means by sensing an external force and generating an electrical signal, but also may provide feedback to a user by generating an vibration by applying an electrical signal to the piezoelectric element.
  • buttons using piezoelectric elements are not easy to manufacture in a thin form, and thus are not widely used.
  • the piezoelectric element is physically stressed due to external force or vibration, and durability is required to withstand such stress.
  • the present invention has been made in an effort to provide a button device using a piezoelectric element, which is easy to manufacture in a thin form and is more suitable for use in portable products such as mobile phones.
  • Another object of the present invention is to provide a button device using a piezoelectric element, which is easy to manufacture in a thin shape, more suitable for use in a portable product such as a mobile phone, and improved durability against physical stress.
  • a piezoelectric body comprising a piezoelectric body having a first external electrode and a second external electrode formed on one surface and a plate on which one surface is attached to the other surface of the piezoelectric body.
  • a support plate disposed on one side of the piezoelectric body; A cover attached to the other surface of the plate; And a spacer provided between the support plate and the plate to provide a space in which the piezoelectric element may be deformed by an external force applied to the cover.
  • the button device may further include an adhesive layer between the plate and the cover.
  • the button device may further include a dot provided in the adhesive layer to transfer the external force to the piezoelectric element.
  • the dot may be harder than the adhesive layer.
  • the button device may further include a flexible printed circuit board having conductive patterns connected to the first external electrode and the second external electrode, respectively.
  • the piezoelectric body may be a laminated piezoelectric body.
  • a dummy electrode may be further formed on one surface of the piezoelectric body, and electrodes including the first and second external electrodes and the dummy electrode may be symmetrical with each other.
  • the second external electrode may be formed in an annular shape, and the first external electrode may be formed inside the annular shape.
  • a button device using a piezoelectric element wherein a piezoelectric body having first and second external electrodes formed on one surface thereof is attached to one surface of the piezoelectric body, and the first and second external portions of the button device are used.
  • a piezoelectric element comprising a plate in which holes for receiving the first and second external electrodes are formed at positions corresponding to the electrodes, respectively; A cover disposed on the other surface side of the piezoelectric body; And a spacer supporting an edge of one surface of the plate and providing a space in which the piezoelectric element may be deformed by an external force applied to the cover.
  • the piezoelectric body may be a laminated piezoelectric body.
  • the button device may further include a pillar member surrounding the piezoelectric element and provided between the spacer and the cover to support the cover.
  • the spacer and the pillar member may be integrally formed.
  • the plate may have an insulated surface.
  • the button device may further include a damper layer between the other surface of the piezoelectric body and the cover.
  • the button device may further include a dot provided in the damper layer to transmit the external force to the piezoelectric element.
  • the dot may be harder than the damper layer.
  • the button device may include: a pillar member surrounding the piezoelectric element and provided on the spacer; A damper layer provided between the pillar member and the cover to support the cover together with the pillar member and to provide a space between the piezoelectric member and the cover; And a dot provided in the separation space to transfer the external force to the piezoelectric element or to transmit the vibration of the piezoelectric element to the cover.
  • Insulating molding may be filled in the holes accommodating the first and second external electrodes.
  • the first and second external electrodes are respectively centered on the first and second external electrodes within 30% of the distance from the center to the edge end with respect to an intermediate point between the center of the piezoelectric body and the edge end of the piezoelectric body. It may be arranged to be located.
  • the button device using the piezoelectric element according to the present invention there is an advantage that it is easy to manufacture a thin, more suitable for use in portable products such as mobile phones.
  • the button device using the piezoelectric element according to the present invention it is easy to manufacture a thin, more suitable for use in portable products such as mobile phones, and has the effect of improving durability against physical stress.
  • FIG. 1A is a side view of a button device using a piezoelectric element according to a first embodiment of the present invention.
  • FIG. 1B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 1A.
  • FIG. 2 is a side view and a plan view of a piezoelectric body 12 according to an embodiment of the present invention.
  • FIG 3 is a side view and a plan view of a piezoelectric body 12 according to another embodiment of the present invention.
  • FIG. 4 is a side view and a plan view of a piezoelectric body 12 according to another exemplary embodiment of the present invention.
  • 5A is a side view of a button device using a piezoelectric element according to a second embodiment of the present invention.
  • FIG. 5B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 5A.
  • FIG. 6A is a side view of a button device using a piezoelectric element according to a third embodiment of the present invention.
  • FIG. 6B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 6A.
  • FIG. 7 is a side view and a plan view of a piezoelectric element 210 according to an embodiment of the present invention.
  • FIG 8 is a view for explaining the stress that the piezoelectric element 210 receives.
  • FIG 9 shows preferred positions of the first and second external electrodes 211a and 211b in the piezoelectric body 212 as proposed in the embodiment of the present invention.
  • FIG. 10A is a side view of a button device using a piezoelectric element according to a fourth embodiment of the present invention.
  • FIG. 10B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 10A.
  • FIG. 1A is a side view of a button device using a piezoelectric element according to a first embodiment of the present invention
  • FIG. 1B is a state in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 1A. Shows an example.
  • the button device includes a piezoelectric element 10, a support plate 20, a cover 30, and a spacer 40.
  • the support plate 20 serves to support the spacer 40, the piezoelectric element 10, the cover 30, and the like placed thereon.
  • the support plate 20 may be made of, for example, tempered glass, epoxy, or the like.
  • the piezoelectric element 10 includes a piezoelectric body 12 and a plate 13.
  • a first external electrode 11a and a second external electrode 11b are formed on one surface (lower surface in FIG. 1).
  • the piezoelectric body 12 is attached to one surface of the plate 13.
  • the piezoelectric body 12 and the plate 13 may be attached by the adhesive 14.
  • the piezoelectric body 12 is made of a material having excellent piezoelectric properties such as quartz, tourmaline, Rochelle salt, barium titanate, monoammonium phosphate, and ethylenediamine tartarate. Can be made.
  • the piezoelectric body 12 is preferably a laminated piezoelectric body having a first external electrode 11a and a second external electrode 11b formed on one surface thereof, and specific examples of the piezoelectric body 12 will be described later with reference to FIGS. 2 to 4. do.
  • the plate 13 is typically metallic, for example stainless steel, and has a larger area than the piezoelectric body 12.
  • the support plate 20 is disposed on one side of the piezoelectric body 12 (lower surface in FIG. 1), and the spacer 40 is disposed between the edge outside the region where the piezoelectric body 12 is attached to one side of the plate 13 and the support plate 20.
  • the spacer 40 is thicker than the piezoelectric body 12 to provide a space S in which the piezoelectric element 10 can be deformed (preferably overlapping the piezoelectric body 12 and the flexible circuit board 70 to be described later). Thick thickness).
  • the plate 13 and the spacer 40 may be attached by an adhesive, and the spacer 40 and the supporting plate 20 may also be attached by an adhesive.
  • the support plate 20 and the spacer 40 may be integrally implemented.
  • the spacer 40 may be implemented so that the space S is also circular.
  • the piezoelectric body 12 and the plate 13 may have shapes other than circular (eg, triangular or square).
  • the spacer 40 may be implemented such that the space S is also triangular or square.
  • the cover 30 is attached to the other surface of the plate 13 (upper surface in FIG. 1) by the adhesive layer 50.
  • a dot 60 may be provided at a portion corresponding to a predetermined region with respect to the center of the piezoelectric element 10.
  • Dot 60 is a harder material than the adhesive layer 50 may serve to more reliably transmit the external force applied to the cover 30 to the piezoelectric element 10.
  • the dot 60 may be omitted. However, the sensitivity may be further improved due to the dot 60.
  • the piezoelectric element 10 deforms in the space S as shown in FIG. 1B, and thus the first and second external electrodes 11a, External force or contact can be detected by measuring the voltage detected in 11b).
  • the button device may include a conductive pattern (not shown) connected to the first and second external electrodes 11a and 11b, respectively.
  • the formed flexible circuit board 70 may be provided.
  • the flexible circuit board 70 may be connected to a circuit device (not shown) that measures a voltage detected by the first and second external electrodes 11a and 11b. Depending on the application, the circuit device may cause vibration in the piezoelectric element 10 by applying an electrical signal to the first and second external electrodes 11a and 11b through the flexible circuit board 70.
  • a wire may be connected to the first and second external electrodes 11a and 11b to measure the voltage detected by the first and second external electrodes 11a and 11b. have.
  • FIG. 2 is a side view and a plan view of a piezoelectric body 12 according to an embodiment of the present invention.
  • first and second external electrodes 11a and 11b are formed on one surface thereof, and a plurality of piezoelectric layers 15 are stacked therein, and between the piezoelectric layers 15.
  • the first and second internal electrodes 16a and 16b are alternately interposed to have different polarities in the directions.
  • the first and second external electrodes 11a and 11b and the first and second internal electrodes 16a and 16b are electrically connected to each other using the first and second conductive vias 17a and 17b, respectively.
  • FIG 3 is a side view and a plan view of a piezoelectric body 12 according to another embodiment of the present invention.
  • the piezoelectric body 12 is further formed on one surface of the piezoelectric body 12 illustrated in FIG. 2.
  • the dummy electrode 11c is an electrode which is not electrically connected to the first and second external electrodes 11a and 11b.
  • the dummy electrode 11c is formed of four first and second external electrodes 11a and 11b and a dummy electrode 11c.
  • the electrodes are arranged to be symmetrical to each other. For example, when the first and second external electrodes 11a and 11b are horizontally disposed (as shown in FIG. 3) as shown, the dummy electrode 11c is disposed between the first and second external electrodes 11a and 11b. Are placed vertically. Since the piezoelectric body 12 is symmetrical due to the dummy electrode 11c, the piezoelectric element 10 may cause stable deformation.
  • FIG. 4 is a side view and a plan view of a piezoelectric body 12 according to another exemplary embodiment of the present invention.
  • the second external electrode 18b is formed in an annular shape, and the first external electrode 18a is disposed inside the annular shape. Therefore, since the shape of the entire first and second external electrodes 18a and 18b is symmetrical, the piezoelectric element 10 may cause stable deformation.
  • FIG. 5A is a side view of a button device using a piezoelectric element according to a second embodiment of the present invention
  • FIG. 5B is a state in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 5A. Shows an example.
  • the button device includes a piezoelectric element 110, a support plate 120, a cover 130, and a spacer 140.
  • the support plate 120 supports the spacer 140, the piezoelectric element 110, the cover 130, and the like placed thereon.
  • the piezoelectric element 110 includes a piezoelectric body 112 and a plate 113.
  • the piezoelectric body 112 has a first external electrode 111a and a second external electrode 111b formed on one surface thereof (upper surface in FIG. 1).
  • the piezoelectric body 112 is attached to one surface of the plate 113.
  • the piezoelectric body 112 and the plate 113 may be attached by the adhesive 114.
  • the piezoelectric body 112 is preferably a stacked piezoelectric material having a first external electrode 111a and a second external electrode 111b formed on one surface thereof, and the piezoelectric body described above with reference to FIGS. 2 to 4 may be used as the piezoelectric body 112. Can be.
  • the plate 113 is typically made of metal, for example stainless steel, and has a larger area than the piezoelectric body 112.
  • the support plate 120 is disposed on the other surface (lower surface in FIG. 5) of the plate 113, and a spacer 140 is provided between the edge of the other surface of the plate 113 and the support plate 20.
  • the spacer 40 has a predetermined thickness to provide a space S in which the piezoelectric element 10 may be deformed.
  • the plate 113 and the spacer 140 may be attached by an adhesive, and the spacer 140 and the supporting plate 120 may also be attached by an adhesive. According to the embodiment, the support plate 120 and the spacer 140 may be integrally implemented.
  • the spacer 140 may be implemented so that the space S is also circular.
  • the piezoelectric body 112 and the plate 113 may have shapes other than circular (eg, triangular or square), and in this case, the spacer 140 may be implemented such that the space S is also triangular or square.
  • the button device may include a conductive pattern (not shown) connected to the first and second external electrodes 111a and 111b, respectively.
  • the formed flexible circuit board 170 may be provided.
  • the flexible circuit board 170 may be connected to a circuit device (not shown) that measures a voltage detected by the first and second external electrodes 11a and 11b. Depending on the application, the circuit device may cause vibration to the piezoelectric element 110 by applying an electrical signal to the first and second external electrodes 111a and 111b through the flexible circuit board 170.
  • a wire may be connected to the first and second external electrodes 111a and 111b to measure a voltage detected by the first and second external electrodes 111a and 111b. have.
  • the flexible printed circuit board 170 may have a layer shape covering substantially the entirety of the piezoelectric body 112 or may have a wiring shape sufficient to guide the conductive pattern connected to the first and second external electrodes 111a and 111b. .
  • the cover 130 may be attached to the flexible circuit board 170 by the adhesive layer 150.
  • the cover 130 may be attached to one surface (the upper surface in FIG. 5) of the piezoelectric body 112 including the flexible circuit board 170 by the adhesive layer 150. .
  • a dot 160 may be provided at a portion corresponding to the center of the piezoelectric element 110.
  • the dot 160 is harder than the adhesive layer 150, and may serve to more reliably transmit the external force applied to the cover 130 to the piezoelectric element 110.
  • the dot 160 may be omitted. However, the sensitivity may be further improved due to the dot 160.
  • the piezoelectric element 110 deforms in the space S as shown in FIG. 5B, and thus the first and second external electrodes 111a, External force or contact can be detected by measuring the voltage detected in 111b).
  • FIG. 6A is a side view of a button device using a piezoelectric element according to a third embodiment of the present invention
  • FIG. 6B is a state in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 6A. Shows an example.
  • the button device includes a piezoelectric element 210, a support plate 220, a cover 230, a spacer 240, a pillar member 245, and a damper layer 250.
  • the support plate 220 supports the spacer 240, the piezoelectric element 210, the pillar member 245, the cover 230, and the like placed thereon.
  • the support plate 220 may be made of, for example, tempered glass, epoxy, or the like.
  • the piezoelectric element 210 includes a piezoelectric element 212 and a plate 213.
  • the piezoelectric material 212 is provided with a first external electrode 211a and a second external electrode 211b on one surface (lower surface in FIG. 6).
  • the piezoelectric material 212 is made of quartz, tourmaline, lead zirconate titanate (PZT), Rochelle salt, barium titanate, monoammonium phosphate, ethylene tartarate, etc. It can be produced using a material having excellent piezoelectricity.
  • the piezoelectric material 212 is preferably a laminated piezoelectric material having a first external electrode 211a and a second external electrode 211b formed on one surface thereof, and a specific example of the piezoelectric material 212 will be described later with reference to FIG. 7.
  • Plate 213 is typically metallic, for example stainless steel, and has a larger area than piezoelectric material 212.
  • the plate 213 is attached to one surface of the piezoelectric body 213, that is, the surface on which the first and second external electrodes 211a and 211b are formed.
  • the piezoelectric body 212 and the plate 213 may be attached by the adhesive 214.
  • holes C a and C b are formed to receive the first and second external electrodes 211 a and 211 b at positions corresponding to the first and second external electrodes 211 a and 211 b , respectively.
  • the sizes of the holes C a and C b are slightly larger than those of the first and second external electrodes 211a and 211b.
  • the plate 213 is preferably the surface is insulated, including an inner peripheral surface of a hole (C a, C b) .
  • the plate 213 may be insulated or coated with an insulating spray.
  • the support plate 220 is disposed on one surface (lower surface in FIG. 6) of the plate 213, and a spacer 240 is provided between the edge of one surface of the plate 213 and the support plate 220.
  • the space 240 supports the edge of one surface of the plate 213 and provides a space S in which the piezoelectric element 210 may be deformed by an external force applied to the cover 230.
  • the plate 213 and the spacer 240 may be attached by an adhesive, and the spacer 240 and the supporting plate 220 may also be attached by an adhesive.
  • the spacer 240 may be implemented so that the space S is also circular.
  • the piezoelectric body 212 and the plate 213 may have shapes other than circular (eg, triangular or square), and in this case, the spacer 240 may be implemented such that the space S is also triangular or square.
  • the cover 230 is disposed on the other surface (upper surface in FIG. 6) of the piezoelectric body 212.
  • a damper layer 250 may be provided between the other surface of the piezoelectric body 212 and the cover 230.
  • the damper layer 250 may be, for example, a material such as urethane, and may serve to improve the assemblability of the button device.
  • the damper layer 250 may serve to match the shape of the cover 230 and the shape of the elements below the cover 230 when the cover 230 is not flat.
  • the damper layer 250 may be omitted.
  • the piezoelectric material 212 and the damper layer 250 may be attached by the first adhesive layer 251, and the damper layer 250 and the cover 230 may be attached by the second adhesive layer 252.
  • an adhesive layer may be provided between the piezoelectric body 212 and the cover 230.
  • a dot 260 may be provided at a portion corresponding to a predetermined region with respect to the center of the piezoelectric element 210. Can be.
  • the dot 260 is a harder material than the first adhesive layer 251, the damper layer 250, and the second adhesive layer 252, and the piezoelectric element 210 more reliably applies the external force applied to the cover 230. Or may transmit a vibration of the piezoelectric element 210 to the cover 230 more reliably.
  • the dot 260 may be provided only in the damper layer 250. In the absence of the damper layer 250, the dot 260 may be provided in the adhesive layer. In some embodiments, the dot 260 may be omitted. However, the sensitivity of the button device may be further improved due to the dot 260.
  • a pillar member surrounding the piezoelectric element 210 and supporting the damper layer 250 and the cover 230. 245 may be provided.
  • the pillar member 245 and the damper layer 250 may be attached by the first adhesive layer 251.
  • an adhesive layer may be provided between the pillar member 245 and the cover 230.
  • the pillar member 245 and the spacer 240 may also be attached by an adhesive. According to the exemplary embodiment, the pillar member 245 and the spacer 240 may be integrally implemented.
  • the piezoelectric element 210 deforms in the space S as shown in FIG. 6B, and thus the first and second external electrodes 211a, External force or contact can be detected by measuring the voltage detected in 211b).
  • vibration of the piezoelectric element 210 occurs by applying electrical signals to the first and second external electrodes 211a and 211b of the piezoelectric element 210, for example, a user who touches the finger on the cover 230 feels vibration. You can get feedback as
  • the first and second external electrodes 211a are used to measure the voltage detected by the first and second external electrodes 211a and 211b or to apply an electrical signal to the first and second external electrodes 211a and 211b.
  • 211b) may be provided with a flexible printed circuit board having conductive patterns respectively connected thereto.
  • a wire may be connected to the first and second external electrodes 211a and 211b instead of the flexible circuit board.
  • the flexible circuit board or wire may be connected to a circuit device (not shown) that measures a voltage detected by the first and second external electrodes 211a and 211b or applies an electrical signal to the first and second external electrodes 211a and 211b. Can be.
  • an insulation molding eg, epoxy molding
  • an insulation molding is formed in the holes C a and C b that accommodate the first and second external electrodes 211a and 211b. Can be filled.
  • FIG. 7 is a side view and a plan view of a piezoelectric element 210 according to an embodiment of the present invention.
  • the piezoelectric material 212 has first and second external electrodes 211a and 211b formed on one surface thereof, and a plurality of piezoelectric layers 215 are stacked therein, and the piezoelectric layers 215 have different polarities in the stacking direction.
  • the first and second internal electrodes 216a and 216b alternately intersect with each other.
  • the first and second external electrodes 211a and 211b and the first and second internal electrodes 216a and 216b are electrically connected to each other using the first and second conductive vias 217a and 217b, respectively.
  • Wires 219a and 219b are connected to the first and second external electrodes 211a and 211b, respectively. As described above, instead of the wires 219a and 219b, a flexible circuit board having conductive patterns connected to the first and second external electrodes 211a and 211b may be used.
  • the plate 213 is attached to one surface of the piezoelectric body 212 by an adhesive 214.
  • a first and a second is filled with the insulating molding each (218a, 218b), the external electrodes (211a, 211b) holes (C a, C b) for receiving.
  • FIG 8 is a view for explaining the stress that the piezoelectric element 210 receives.
  • the displacement is the largest in the center portion A, and the stress is the largest in the edge portion B fixed to the spacer 240.
  • the conductive vias 217a and 217b may be formed inside the piezoelectric body 212 corresponding to the external electrodes 211a and 211b. 217b), external electrodes, conductive vias, internal electrodes, wires (or flexible printed circuit boards), etc. may be damaged or the connections therebetween may be damaged.
  • the inventor of the present invention studied the position and range of the external electrode that can minimize the effects of the displacement and stress of the piezoelectric element 210 through experiments and simulations. As a result, the influence of displacement and stress is substantially between the points within 30% of the distance from the center of the piezoelectric element 212 to the edge end with respect to the intermediate point between the center of the piezoelectric element 212 and the edge end of the piezoelectric element 212. It was confirmed that none.
  • FIG 9 shows preferred positions of the first and second external electrodes 211a and 211b in the piezoelectric body 212 as proposed in the embodiment of the present invention.
  • the intermediate point is R / 2
  • the first and second external electrodes 211a are , 211b) is preferably disposed within 0.3 R from the R / 2 point to within 30% of R, ie from the R / 2 point.
  • the external electrode may be positioned within 1.5 mm on both sides of the 2.5 mm (2 / R) point from the center of the piezoelectric body 212.
  • the influence of the displacement and the stress of the piezoelectric element 210 can be minimized.
  • FIG. 10A is a side view of a button device using a piezoelectric element according to a fourth embodiment of the present invention
  • FIG. 10B is a view in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 10A. Shows an example.
  • the damper layer 250, the first adhesive layer 251, and the second adhesive layer 252 entirely cover the piezoelectric body 212 and the pillar member 245, and the dot 260 is damper.
  • the structure is provided in the layer 250, the first adhesive layer 251, and the second adhesive layer 252.
  • the damper layer 250 ′, the first adhesive layer 251 ′, and the second adhesive layer 252 ′ cover only the pillar member 245 without covering the piezoelectric body 212. It is a structure.
  • the damper layer 250 ′, the first adhesive layer 251 ′, and the second adhesive layer 252 ′ surround the piezoelectric element 210.
  • the damper layer 250 ′ supports the cover 230, and the damper layer 250 ′ provides a space between the piezoelectric body 212 and the cover 230.
  • a dot 260 is provided in a portion corresponding to a predetermined region with respect to the center of the piezoelectric body 212 in the space.
  • the vibration of the piezoelectric element 210 not only deforms the piezoelectric element 210 to be convex downward in FIG. 10 (ie, toward the support plate 220), but also convexly upward (ie, toward the cover 230). Let's do it.
  • the space provided by the damper layer 250 ′ may make it easier for the piezoelectric element 210 to be convexly deformed upward.
  • the damper layer 250 ′ provides a separation space to smoothly vibrate the piezoelectric element 210, thereby effectively transmitting the vibration of the piezoelectric element 210 to the user.

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  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

A button device using a piezoelectric element, according to the present invention, comprises: a piezoelectric device comprising a piezoelectric body having a first external electrode and a second external electrode formed on one surface thereof, and a plate of which one surface is attached to the other surface of the piezoelectric body; a support plate which is arranged on one surface of the piezoelectric body; a cover which is attached to the other surface of the plate; and a spacer which is disposed between the support plate and the plate so as to provide a space where the piezoelectric device can be deformed by means of an external force applied to the cover.

Description

압전 소자를 이용한 버튼 장치Button device using piezoelectric element
본 발명은 버튼 장치에 관한 것으로, 보다 상세하게는 압전 소자를 이용한 버튼 장치에 관한 것이다.The present invention relates to a button device, and more particularly to a button device using a piezoelectric element.
근래에 휴대 전화나 게임기, 가전제품 등의 사용자 인터페이스, 혹은 엘리베이터의 버튼이나 건물 내의 스위치 등으로 압전 소자를 이용한 버튼이 각광받고 있다.In recent years, a button using a piezoelectric element has been in the spotlight as a user interface of a mobile phone, a game machine, a home appliance, or an elevator button or a switch in a building.
압전 소자란 압전 효과를 이용하는 소자로서, 외력(또는 접촉)을 가하면 전기 분극이 일어나서 전위차가 생기고, 반대로 전압을 가하면 변형이나 변형력이 생기는 성질을 가진 소자를 의미한다.A piezoelectric element is a device that utilizes a piezoelectric effect, and refers to an element having a property of causing electric polarization when an external force (or contact) is applied to cause a potential difference, and conversely, deformation or deformation force when a voltage is applied.
압전 소자를 이용한 버튼은 외력을 감지하여 전기적 신호를 생성함으로써 입력 수단으로 기능할 수 있을 뿐만 아니라, 압전 소자에 전기적 신호를 가하여 진동을 발생시킴으로써 사용자에게 피드백을 줄 수도 있는 장점을 가지고 있다.A button using a piezoelectric element may not only function as an input means by sensing an external force and generating an electrical signal, but also may provide feedback to a user by generating an vibration by applying an electrical signal to the piezoelectric element.
이러한 장점에도 불구하고 압전 소자를 이용한 버튼은 박형으로 제작하기가 쉽지 않은 등 구현에 어려움이 있어 아직까지 널리 활용되지 못하고 있다. 또한 압전 소자는 외력이나 진동으로 인하여 물리적으로 스트레스를 받게 되는데 이러한 스트레스를 견딜 수 있는 내구성이 요구된다.Despite these advantages, the buttons using piezoelectric elements are not easy to manufacture in a thin form, and thus are not widely used. In addition, the piezoelectric element is physically stressed due to external force or vibration, and durability is required to withstand such stress.
본 발명이 이루고자 하는 기술적 과제는, 박형으로 제작하기가 용이하여 휴대 전화 등 휴대용 제품에 사용되기에 보다 적합한, 압전 소자를 이용한 버튼 장치를 제공하는 데 있다. SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a button device using a piezoelectric element, which is easy to manufacture in a thin form and is more suitable for use in portable products such as mobile phones.
또한 본 발명이 이루고자 하는 기술적 과제는, 박형으로 제작하기가 용이하여 휴대 전화 등 휴대용 제품에 사용되기에 보다 적합하며 물리적 스트레스에 대한 내구성이 향상된, 압전 소자를 이용한 버튼 장치를 제공하는 데 있다. Another object of the present invention is to provide a button device using a piezoelectric element, which is easy to manufacture in a thin shape, more suitable for use in a portable product such as a mobile phone, and improved durability against physical stress.
본 발명의 해결하고자 하는 과제는 이상에서 언급한 과제로 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The problem to be solved of the present invention is not limited to the above-mentioned problem, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
상기 기술적 과제를 해결하기 위한 본 발명의 일 태양에 따른 압전 소자를 이용한 버튼 장치는, 일면에 제1 외부 전극 및 제2 외부 전극이 형성된 압전체 및 일면이 상기 압전체의 타면에 부착되는 플레이트로 이루어지는 압전 소자; 상기 압전체의 일면 측에 배치되는 지지판; 상기 플레이트의 타면에 부착되는 커버; 및 상기 커버에 가해지는 외력에 의하여 상기 압전 소자가 변형될 수 있는 공간을 제공하도록 상기 지지판과 상기 플레이트 사이에 마련되는 스페이서를 포함한다.In the button device using the piezoelectric element according to an aspect of the present invention for solving the above technical problem, a piezoelectric body comprising a piezoelectric body having a first external electrode and a second external electrode formed on one surface and a plate on which one surface is attached to the other surface of the piezoelectric body. device; A support plate disposed on one side of the piezoelectric body; A cover attached to the other surface of the plate; And a spacer provided between the support plate and the plate to provide a space in which the piezoelectric element may be deformed by an external force applied to the cover.
상기 버튼 장치는, 상기 플레이트와 상기 커버 사이의 접착제층을 더 포함할 수 있다.The button device may further include an adhesive layer between the plate and the cover.
상기 버튼 장치는, 상기 접착제층 내에 마련되어 상기 외력을 상기 압전 소자로 전달하는 도트를 더 포함할 수 있다.The button device may further include a dot provided in the adhesive layer to transfer the external force to the piezoelectric element.
상기 도트는 상기 접착제층보다 경질일 수 있다.The dot may be harder than the adhesive layer.
상기 버튼 장치는, 상기 제1 외부 전극 및 상기 제2 외부 전극과 각각 연결되는 도선 패턴이 형성된 연성회로기판을 더 포함할 수 있다.The button device may further include a flexible printed circuit board having conductive patterns connected to the first external electrode and the second external electrode, respectively.
상기 압전체는 적층형 압전체일 수 있다.The piezoelectric body may be a laminated piezoelectric body.
상기 압전체의 일면에는 더미 전극이 더 형성되고, 상기 제1, 제2 외부 전극 및 상기 더미 전극을 포함하는 전극들이 서로 대칭을 이루도록 배치될 수 있다.A dummy electrode may be further formed on one surface of the piezoelectric body, and electrodes including the first and second external electrodes and the dummy electrode may be symmetrical with each other.
상기 제2 외부 전극은 환형으로 형성되고, 상기 제1 외부 전극은 상기 환형의 안쪽에 형성될 수 있다.The second external electrode may be formed in an annular shape, and the first external electrode may be formed inside the annular shape.
상기 기술적 과제를 해결하기 위한 본 발명의 다른 일 태양에 따른 압전 소자를 이용한 버튼 장치는, 일면에 제1 및 제2 외부 전극이 형성된 압전체 및 상기 압전체의 일면에 부착되며 상기 제1 및 제2 외부 전극에 해당하는 위치에 각각 상기 제1 및 제2 외부 전극을 수용하는 홀이 형성된 플레이트로 이루어지는 압전 소자; 상기 압전체의 타면 측에 배치되는 커버; 및 상기 플레이트의 일면의 가장자리를 지지하며 상기 커버에 가해지는 외력에 의하여 상기 압전 소자가 변형될 수 있는 공간을 제공하는 스페이서를 포함한다.According to another aspect of the present invention, there is provided a button device using a piezoelectric element, wherein a piezoelectric body having first and second external electrodes formed on one surface thereof is attached to one surface of the piezoelectric body, and the first and second external portions of the button device are used. A piezoelectric element comprising a plate in which holes for receiving the first and second external electrodes are formed at positions corresponding to the electrodes, respectively; A cover disposed on the other surface side of the piezoelectric body; And a spacer supporting an edge of one surface of the plate and providing a space in which the piezoelectric element may be deformed by an external force applied to the cover.
상기 압전체는 적층형 압전체일 수 있다.The piezoelectric body may be a laminated piezoelectric body.
상기 버튼 장치는, 상기 압전 소자를 둘러싸며 상기 스페이서와 상기 커버 사이에 마련되어 상기 커버를 받치는 필라부재를 더 포함할 수 있다.The button device may further include a pillar member surrounding the piezoelectric element and provided between the spacer and the cover to support the cover.
상기 스페이서와 상기 필라부재는 일체로 형성될 수 있다.The spacer and the pillar member may be integrally formed.
상기 플레이트는 표면이 절연처리되어 있을 수 있다.The plate may have an insulated surface.
상기 버튼 장치는, 상기 압전체의 타면과 상기 커버 사이의 댐퍼층을 더 포함할 수 있다.The button device may further include a damper layer between the other surface of the piezoelectric body and the cover.
상기 버튼 장치는, 상기 댐퍼층 내에 마련되어 상기 외력을 상기 압전 소자로 전달하는 도트를 더 포함할 수 있다.The button device may further include a dot provided in the damper layer to transmit the external force to the piezoelectric element.
상기 도트는 상기 댐퍼층보다 경질일 수 있다.The dot may be harder than the damper layer.
상기 버튼 장치는, 상기 압전 소자를 둘러싸며 상기 스페이서 상에 마련되는 필라부재; 상기 필라부재와 상기 커버 사이에 마련되어 상기 필라부재와 함께 상기 커버를 받치며 상기 압전체와 상기 커버 사이에 이격 공간을 제공하는 댐퍼층; 및 상기 이격 공간 내에 마련되어 상기 외력을 상기 압전 소자로 전달하거나 상기 압전 소자의 진동을 상기 커버로 전달하는 도트를 더 포함할 수 있다.The button device may include: a pillar member surrounding the piezoelectric element and provided on the spacer; A damper layer provided between the pillar member and the cover to support the cover together with the pillar member and to provide a space between the piezoelectric member and the cover; And a dot provided in the separation space to transfer the external force to the piezoelectric element or to transmit the vibration of the piezoelectric element to the cover.
상기 제1 및 제2 외부 전극을 수용하는 홀에는 절연 몰딩이 채워질 수 있다.Insulating molding may be filled in the holes accommodating the first and second external electrodes.
상기 제1 및 제2 외부 전극은 각각, 상기 압전체의 중심으로부터 상기 압전체의 가장자리 끝 사이의 중간 지점을 기준으로 상기 중심에서 상기 가장자리 끝까지의 거리의 30% 이내에 상기 제1 및 제2 외부 전극의 중심이 위치하도록 배치될 수 있다.The first and second external electrodes are respectively centered on the first and second external electrodes within 30% of the distance from the center to the edge end with respect to an intermediate point between the center of the piezoelectric body and the edge end of the piezoelectric body. It may be arranged to be located.
상기된 본 발명에 따른 압전 소자를 이용한 버튼 장치는, 박형으로 제작하기가 용이하여 휴대 전화 등 휴대용 제품에 사용되기에 보다 적합한 장점이 있다. The button device using the piezoelectric element according to the present invention, there is an advantage that it is easy to manufacture a thin, more suitable for use in portable products such as mobile phones.
또한, 상기된 본 발명에 따른 압전 소자를 이용한 버튼 장치는, 박형으로 제작하기가 용이하여 휴대 전화 등 휴대용 제품에 사용되기에 보다 적합하며, 물리적 스트레스에 대한 내구성이 향상되는 효과가 있다. In addition, the button device using the piezoelectric element according to the present invention, it is easy to manufacture a thin, more suitable for use in portable products such as mobile phones, and has the effect of improving durability against physical stress.
본 발명의 효과는 이상에서 언급한 효과로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.
도 1a는 본 발명의 제1 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이다.1A is a side view of a button device using a piezoelectric element according to a first embodiment of the present invention.
도 1b는 도 1a의 버튼 장치에 외력이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.FIG. 1B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 1A.
도 2는 본 발명의 일 실시예에 따른 압전체(12)의 측면도 및 평면도이다.2 is a side view and a plan view of a piezoelectric body 12 according to an embodiment of the present invention.
도 3은 본 발명의 다른 일 실시예에 따른 압전체(12)의 측면도 및 평면도이다.3 is a side view and a plan view of a piezoelectric body 12 according to another embodiment of the present invention.
도 4는 본 발명의 또 다른 일 실시예에 따른 압전체(12)의 측면도 및 평면도이다.4 is a side view and a plan view of a piezoelectric body 12 according to another exemplary embodiment of the present invention.
도 5a는 본 발명의 제2 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이다.5A is a side view of a button device using a piezoelectric element according to a second embodiment of the present invention.
도 5b는 도 5a의 버튼 장치에 외력이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.FIG. 5B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 5A.
도 6a는 본 발명의 제3 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이다.6A is a side view of a button device using a piezoelectric element according to a third embodiment of the present invention.
도 6b는 도 6a의 버튼 장치에 외력이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.6B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 6A.
도 7은 본 발명의 일 실시예에 따른 압전 소자(210)의 측면도 및 평면도이다.7 is a side view and a plan view of a piezoelectric element 210 according to an embodiment of the present invention.
도 8은 압전 소자(210)가 받게 되는 스트레스를 설명하기 위한 도면이다.8 is a view for explaining the stress that the piezoelectric element 210 receives.
도 9는 본 발명의 실시예에서 제안하는, 압전체(212)에서의 제1 및 제2 외부 전극(211a, 211b)의 바람직한 위치를 나타낸다. 9 shows preferred positions of the first and second external electrodes 211a and 211b in the piezoelectric body 212 as proposed in the embodiment of the present invention.
도 10a는 본 발명의 제4 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이다.10A is a side view of a button device using a piezoelectric element according to a fourth embodiment of the present invention.
도 10b는 도 10a의 버튼 장치에 외력이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.FIG. 10B illustrates an example in which the piezoelectric element is deformed when an external force is applied to the button device of FIG. 10A.
이하에서는 도면을 참조하여 본 발명의 바람직한 실시예들을 상세히 설명한다. 이하 설명 및 첨부된 도면들에서 실질적으로 동일한 구성요소들은 각각 동일한 부호들로 나타냄으로써 중복 설명을 생략하기로 한다. 또한 본 발명을 설명함에 있어 관련된 공지기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그에 대한 상세한 설명은 생략하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, the substantially identical components are represented by the same reference numerals, and thus redundant description will be omitted. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
도 1a는 본 발명의 제1 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이고, 도 1b는 도 1a의 버튼 장치에 외력(또는 접촉)(F)이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.FIG. 1A is a side view of a button device using a piezoelectric element according to a first embodiment of the present invention, and FIG. 1B is a state in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 1A. Shows an example.
본 실시예에 따른 버튼 장치는, 압전 소자(10), 지지판(20), 커버(30), 스페이서(40)를 포함한다.The button device according to the present embodiment includes a piezoelectric element 10, a support plate 20, a cover 30, and a spacer 40.
지지판(20)은 그 위에 놓인 스페이서(40), 압전 소자(10), 커버(30) 등을 지지하는 역할을 한다. 지지판(20)은 예컨대 강화유리, 에폭시 등으로 제작될 수 있다.The support plate 20 serves to support the spacer 40, the piezoelectric element 10, the cover 30, and the like placed thereon. The support plate 20 may be made of, for example, tempered glass, epoxy, or the like.
압전 소자(10)는 압전체(12) 및 플레이트(13)를 포함한다. 압전체(12)는 일면(도 1에서는 하면)에 제1 외부 전극(11a) 및 제2 외부 전극(11b)이 형성된다. 플레이트(13)의 일면에는 압전체(12)가 부착된다. 압전체(12)와 플레이트(13)는 접착제(14)에 의해 부착될 수 있다.The piezoelectric element 10 includes a piezoelectric body 12 and a plate 13. In the piezoelectric body 12, a first external electrode 11a and a second external electrode 11b are formed on one surface (lower surface in FIG. 1). The piezoelectric body 12 is attached to one surface of the plate 13. The piezoelectric body 12 and the plate 13 may be attached by the adhesive 14.
압전체(12)는 수정, 전기석(tourmaline), 로셸염(Rochelle salt), 타이타늄산바륨(barium titanate), 인산이수소암모늄(Monoammonium Phosphate), 타타르산에틸렌다이아민 등의 압전성이 뛰어난 재료를 이용하여 제작될 수 있다. 압전체(12)는 한쪽면에 제1 외부 전극(11a) 및 제2 외부 전극(11b)이 형성된 적층형 압전체인 것이 바람직하며, 압전체(12)의 구체적인 예들은 도 2 내지 4를 참조하여 후술하기로 한다.The piezoelectric body 12 is made of a material having excellent piezoelectric properties such as quartz, tourmaline, Rochelle salt, barium titanate, monoammonium phosphate, and ethylenediamine tartarate. Can be made. The piezoelectric body 12 is preferably a laminated piezoelectric body having a first external electrode 11a and a second external electrode 11b formed on one surface thereof, and specific examples of the piezoelectric body 12 will be described later with reference to FIGS. 2 to 4. do.
플레이트(13)는 전형적으로 금속제로서, 예컨대 스테인레스 재질일 수 있으며, 압전체(12)보다 큰 면적을 가진다.The plate 13 is typically metallic, for example stainless steel, and has a larger area than the piezoelectric body 12.
지지판(20)은 압전체(12)의 일면(도 1에서는 하면) 측에 배치되고, 스페이서(40)가 플레이트(13)의 일면 중 압전체(12)가 부착된 영역 밖의 가장자리와 지지판(20) 사이에 마련된다. 스페이서(40)는 압전 소자(10)가 변형될 수 있는 공간(S)을 제공하도록 압전체(12)보다 두꺼운 두께(바람직하게는 압전체(12)와 후술할 연성회로기판(70)을 겹친 것보다 두꺼운 두께)를 가진다. The support plate 20 is disposed on one side of the piezoelectric body 12 (lower surface in FIG. 1), and the spacer 40 is disposed between the edge outside the region where the piezoelectric body 12 is attached to one side of the plate 13 and the support plate 20. To be prepared. The spacer 40 is thicker than the piezoelectric body 12 to provide a space S in which the piezoelectric element 10 can be deformed (preferably overlapping the piezoelectric body 12 and the flexible circuit board 70 to be described later). Thick thickness).
플레이트(13)와 스페이서(40)는 접착제에 의해 부착될 수 있고, 스페이서(40)와 지지판(20) 역시 접착제에 의해 부착될 수 있다. 실시예에 따라서는, 지지판(20)과 스페이서(40)는 일체형으로 구현될 수도 있다. The plate 13 and the spacer 40 may be attached by an adhesive, and the spacer 40 and the supporting plate 20 may also be attached by an adhesive. In some embodiments, the support plate 20 and the spacer 40 may be integrally implemented.
압전체(12)와 플레이트(13)의 모양이 예컨대 원형인 경우, 공간(S) 역시 원형이 되도록 스페이서(40)가 구현될 수 있다. 압전체(12)와 플레이트(13)의 모양은 원형 이외의 다른 형상(예컨대 삼각 또는 사각)일 수 있으며, 이 경우 공간(S) 역시 삼각 또는 사각 형태가 되도록 스페이서(40)가 구현될 수 있다.When the piezoelectric body 12 and the plate 13 have a circular shape, for example, the spacer 40 may be implemented so that the space S is also circular. The piezoelectric body 12 and the plate 13 may have shapes other than circular (eg, triangular or square). In this case, the spacer 40 may be implemented such that the space S is also triangular or square.
플레이트(13)의 타면(도 1에서는 상면)에는 접착제층(50)에 의하여 커버(30)가 부착된다.The cover 30 is attached to the other surface of the plate 13 (upper surface in FIG. 1) by the adhesive layer 50.
접착제층(50) 내에는 압전 소자(10)의 중심을 기준으로 일정 영역에 해당하는 부분에 도트(dot)(60)가 마련될 수 있다. 도트(60)는 접착제층(50)보다 경질의 재질로서 커버(30)에 가해지는 외력을 압전 소자(10)로 보다 신뢰성 있게 전달하는 역할을 할 수 있다. 실시예에 따라서는 도트(60)는 생략될 수도 있다. 다만 도트(60)로 인하여 감도가 보다 개선될 수 있다.In the adhesive layer 50, a dot 60 may be provided at a portion corresponding to a predetermined region with respect to the center of the piezoelectric element 10. Dot 60 is a harder material than the adhesive layer 50 may serve to more reliably transmit the external force applied to the cover 30 to the piezoelectric element 10. In some embodiments, the dot 60 may be omitted. However, the sensitivity may be further improved due to the dot 60.
손가락 등에 의하여 커버(30)에 외력(F)이 가해지면, 도 1b에 도시된 바와 같이 공간(S) 내에서 압전 소자(10)가 변형을 일으키고, 이에 따라 제1,2 외부 전극(11a, 11b)에서 검출되는 전압을 측정함으로써 외력 또는 접촉을 검출할 수 있다.When the external force F is applied to the cover 30 by a finger or the like, the piezoelectric element 10 deforms in the space S as shown in FIG. 1B, and thus the first and second external electrodes 11a, External force or contact can be detected by measuring the voltage detected in 11b).
제1,2 외부 전극(11a, 11b)에서 검출되는 전압을 측정하기 위하여, 본 실시예에 따른 버튼 장치는 제1,2 외부 전극(11a, 11b)과 각각 연결되는 도선 패턴(미도시)이 형성된 연성회로기판(70)을 구비할 수 있다.In order to measure the voltage detected by the first and second external electrodes 11a and 11b, the button device according to the present exemplary embodiment may include a conductive pattern (not shown) connected to the first and second external electrodes 11a and 11b, respectively. The formed flexible circuit board 70 may be provided.
연성회로기판(70)은 제1,2 외부 전극(11a, 11b)에서 검출되는 전압을 측정하는 회로 장치(미도시)와 연결될 수 있다. 응용에 따라서는, 상기 회로 장치는 연성회로기판(70)을 통하여 제1,2 외부 전극(11a, 11b)에 전기적 신호를 인가함으로써 압전 소자(10)에 진동을 일으킬 수도 있다.The flexible circuit board 70 may be connected to a circuit device (not shown) that measures a voltage detected by the first and second external electrodes 11a and 11b. Depending on the application, the circuit device may cause vibration in the piezoelectric element 10 by applying an electrical signal to the first and second external electrodes 11a and 11b through the flexible circuit board 70.
실시예에 따라서는, 연성회로기판(70) 대신에, 제1,2 외부 전극(11a, 11b)에 와이어를 연결하여 제1,2 외부 전극(11a, 11b)에서 검출되는 전압을 측정할 수도 있다.According to an exemplary embodiment, instead of the flexible circuit board 70, a wire may be connected to the first and second external electrodes 11a and 11b to measure the voltage detected by the first and second external electrodes 11a and 11b. have.
도 2는 본 발명의 일 실시예에 따른 압전체(12)의 측면도 및 평면도이다.2 is a side view and a plan view of a piezoelectric body 12 according to an embodiment of the present invention.
본 실시예에 따른 압전체(12)는, 일면에 제1 및 제2 외부 전극(11a, 11b)이 형성되고, 내부에 복수의 압전층(15)이 적층되며, 압전층(15) 사이에는 적층 방향으로 서로 다른 극성을 가지도록 교번하는 제1 및 제2 내부 전극(16a, 16b)이 개재된다. 제1 및 제2 외부 전극(11a, 11b)과 제1 및 제2 내부 전극(16a, 16b)은 각각 제1 및 제2 도전성 비아(17a, 17b)를 이용하여 전기적으로 연결된다.In the piezoelectric body 12 according to the present exemplary embodiment, first and second external electrodes 11a and 11b are formed on one surface thereof, and a plurality of piezoelectric layers 15 are stacked therein, and between the piezoelectric layers 15. The first and second internal electrodes 16a and 16b are alternately interposed to have different polarities in the directions. The first and second external electrodes 11a and 11b and the first and second internal electrodes 16a and 16b are electrically connected to each other using the first and second conductive vias 17a and 17b, respectively.
도 3은 본 발명의 다른 일 실시예에 따른 압전체(12)의 측면도 및 평면도이다.3 is a side view and a plan view of a piezoelectric body 12 according to another embodiment of the present invention.
본 실시예에 따른 압전체(12)는 도 2에 도시된 압전체(12)의 일면에 적어도 하나의 더미 전극(11c)이 더 형성된 것이다. 더미 전극(11c)은 제1 및 제2 외부 전극(11a, 11b)과 전기적으로 연결되지 않은 전극으로서, 제1 및 제2 외부 전극(11a, 11b)과 더미 전극(11c)으로 구성되는 4개의 전극들은 서로 대칭을 이루도록 배치된다. 예컨대 도시된 바와 같이 제1 및 제2 외부 전극(11a, 11b)이 (도 3을 기준으로) 가로로 배치된 경우, 더미 전극(11c)은 제1 및 제2 외부 전극(11a, 11b) 사이에 세로로 배치된다. 이러한 더미 전극(11c)으로 인하여 압전체(12)가 대칭 형상을 띠게 되므로, 압전 소자(10)가 안정적인 변형을 일으키도록 할 수 있다. In the piezoelectric body 12 according to the present exemplary embodiment, at least one dummy electrode 11c is further formed on one surface of the piezoelectric body 12 illustrated in FIG. 2. The dummy electrode 11c is an electrode which is not electrically connected to the first and second external electrodes 11a and 11b. The dummy electrode 11c is formed of four first and second external electrodes 11a and 11b and a dummy electrode 11c. The electrodes are arranged to be symmetrical to each other. For example, when the first and second external electrodes 11a and 11b are horizontally disposed (as shown in FIG. 3) as shown, the dummy electrode 11c is disposed between the first and second external electrodes 11a and 11b. Are placed vertically. Since the piezoelectric body 12 is symmetrical due to the dummy electrode 11c, the piezoelectric element 10 may cause stable deformation.
도 4는 본 발명의 또 다른 일 실시예에 따른 압전체(12)의 측면도 및 평면도이다.4 is a side view and a plan view of a piezoelectric body 12 according to another exemplary embodiment of the present invention.
본 실시예에 따른 압전체(12)에서 제2 외부 전극(18b)은 환형으로 형성되며, 제1 외부 전극(18a)은 환형의 안쪽에 배치된다. 따라서 제1 및 제2 외부 전극(18a, 18b) 전체의 형상은 대칭을 이루게 되므로, 압전 소자(10)가 안정적인 변형을 일으키도록 할 수 있다. In the piezoelectric body 12 according to the present embodiment, the second external electrode 18b is formed in an annular shape, and the first external electrode 18a is disposed inside the annular shape. Therefore, since the shape of the entire first and second external electrodes 18a and 18b is symmetrical, the piezoelectric element 10 may cause stable deformation.
도 5a는 본 발명의 제2 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이고, 도 5b는 도 5a의 버튼 장치에 외력(또는 접촉)(F)이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.5A is a side view of a button device using a piezoelectric element according to a second embodiment of the present invention, and FIG. 5B is a state in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 5A. Shows an example.
본 실시예에 따른 버튼 장치는, 압전 소자(110), 지지판(120), 커버(130), 스페이서(140)를 포함한다.The button device according to the present embodiment includes a piezoelectric element 110, a support plate 120, a cover 130, and a spacer 140.
지지판(120)은 그 위에 놓인 스페이서(140), 압전 소자(110), 커버(130) 등을 지지하는 역할을 한다.The support plate 120 supports the spacer 140, the piezoelectric element 110, the cover 130, and the like placed thereon.
압전 소자(110)는 압전체(112) 및 플레이트(113)를 포함한다. 압전체(112)는 일면(도 1에서는 상면)에 제1 외부 전극(111a) 및 제2 외부 전극(111b)이 형성된다. 플레이트(113)의 일면에는 압전체(112)가 부착된다. 압전체(112)와 플레이트(113)는 접착제(114)에 의해 부착될 수 있다.The piezoelectric element 110 includes a piezoelectric body 112 and a plate 113. The piezoelectric body 112 has a first external electrode 111a and a second external electrode 111b formed on one surface thereof (upper surface in FIG. 1). The piezoelectric body 112 is attached to one surface of the plate 113. The piezoelectric body 112 and the plate 113 may be attached by the adhesive 114.
압전체(112)는 한쪽면에 제1 외부 전극(111a) 및 제2 외부 전극(111b)이 형성된 적층형 압전체인 것이 바람직하며, 압전체(112)로는 앞에서 도 2 내지 4를 참조하여 설명한 압전체가 이용될 수 있다.The piezoelectric body 112 is preferably a stacked piezoelectric material having a first external electrode 111a and a second external electrode 111b formed on one surface thereof, and the piezoelectric body described above with reference to FIGS. 2 to 4 may be used as the piezoelectric body 112. Can be.
플레이트(113)는 전형적으로 금속제로서, 예컨대 스테인레스 재질일 수 있으며, 압전체(112)보다 큰 면적을 가진다.The plate 113 is typically made of metal, for example stainless steel, and has a larger area than the piezoelectric body 112.
지지판(120)은 플레이트(113)의 타면(도 5에서는 하면) 측에 배치되고, 플레이트(113)의 타면의 가장자리와 지지판(20) 사이에 스페이서(140)가 마련된다. 스페이서(40)는 소정의 두께를 가져 압전 소자(10)가 변형될 수 있는 공간(S)을 제공한다.The support plate 120 is disposed on the other surface (lower surface in FIG. 5) of the plate 113, and a spacer 140 is provided between the edge of the other surface of the plate 113 and the support plate 20. The spacer 40 has a predetermined thickness to provide a space S in which the piezoelectric element 10 may be deformed.
플레이트(113)와 스페이서(140)는 접착제에 의해 부착될 수 있고, 스페이서(140)와 지지판(120) 역시 접착제에 의해 부착될 수 있다. 실시예에 따라서는, 지지판(120)과 스페이서(140)는 일체형으로 구현될 수도 있다. The plate 113 and the spacer 140 may be attached by an adhesive, and the spacer 140 and the supporting plate 120 may also be attached by an adhesive. According to the embodiment, the support plate 120 and the spacer 140 may be integrally implemented.
압전체(112)와 플레이트(113)의 모양이 예컨대 원형인 경우, 공간(S) 역시 원형이 되도록 스페이서(140)가 구현될 수 있다. 압전체(112)와 플레이트(113)의 모양은 원형 이외의 다른 형상(예컨대 삼각 또는 사각)일 수 있으며, 이 경우 공간(S) 역시 삼각 또는 사각 형태가 되도록 스페이서(140)가 구현될 수 있다.When the piezoelectric body 112 and the plate 113 have a circular shape, for example, the spacer 140 may be implemented so that the space S is also circular. The piezoelectric body 112 and the plate 113 may have shapes other than circular (eg, triangular or square), and in this case, the spacer 140 may be implemented such that the space S is also triangular or square.
제1,2 외부 전극(111a, 111b)에서 검출되는 전압을 측정하기 위하여, 본 실시예에 따른 버튼 장치는 제1,2 외부 전극(111a, 111b)과 각각 연결되는 도선 패턴(미도시)이 형성된 연성회로기판(170)을 구비할 수 있다.In order to measure the voltage detected by the first and second external electrodes 111a and 111b, the button device according to the present exemplary embodiment may include a conductive pattern (not shown) connected to the first and second external electrodes 111a and 111b, respectively. The formed flexible circuit board 170 may be provided.
연성회로기판(170)은 제1,2 외부 전극(11a, 11b)에서 검출되는 전압을 측정하는 회로 장치(미도시)와 연결될 수 있다. 응용에 따라서는, 상기 회로 장치는 연성회로기판(170)을 통하여 제1,2 외부 전극(111a, 111b)에 전기적 신호를 인가함으로써 압전 소자(110)에 진동을 일으킬 수도 있다.The flexible circuit board 170 may be connected to a circuit device (not shown) that measures a voltage detected by the first and second external electrodes 11a and 11b. Depending on the application, the circuit device may cause vibration to the piezoelectric element 110 by applying an electrical signal to the first and second external electrodes 111a and 111b through the flexible circuit board 170.
실시예에 따라서는, 연성회로기판(170) 대신에, 제1,2 외부 전극(111a, 111b)에 와이어를 연결하여 제1,2 외부 전극(111a, 111b)에서 검출되는 전압을 측정할 수도 있다.In some embodiments, instead of the flexible circuit board 170, a wire may be connected to the first and second external electrodes 111a and 111b to measure a voltage detected by the first and second external electrodes 111a and 111b. have.
연성회로기판(170)은 압전체(112)의 대략 전체를 덮는 층 형태일 수도 있고, 제1,2 외부 전극(111a, 111b)과 연결되는 도선 패턴을 가이드하기에 충분한 정도의 배선 형태일 수도 있다.The flexible printed circuit board 170 may have a layer shape covering substantially the entirety of the piezoelectric body 112 or may have a wiring shape sufficient to guide the conductive pattern connected to the first and second external electrodes 111a and 111b. .
연성회로기판(170)이 층 형태인 경우, 연성회로기판(170) 위에 접착제층(150)에 의하여 커버(130)가 부착될 수 있다.When the flexible circuit board 170 is in the form of a layer, the cover 130 may be attached to the flexible circuit board 170 by the adhesive layer 150.
연성회로기판(170)이 배선 형태인 경우, 연성회로기판(170)을 포함하여 압전체(112)의 일면(도 5에서는 상면)에 접착제층(150)에 의하여 커버(130)가 부착될 수 있다.When the flexible circuit board 170 is in the form of a wire, the cover 130 may be attached to one surface (the upper surface in FIG. 5) of the piezoelectric body 112 including the flexible circuit board 170 by the adhesive layer 150. .
접착제층(150) 내에는 압전 소자(110)의 대략 가운데에 해당하는 부분에 도트(dot)(160)가 마련될 수 있다. 도트(160)는 접착제층(150)보다 경질의 재질로서 커버(130)에 가해지는 외력을 압전 소자(110)로 보다 신뢰성 있게 전달하는 역할을 할 수 있다. 실시예에 따라서는 도트(160)는 생략될 수도 있다. 다만 도트(160)로 인하여 감도가 보다 개선될 수 있다.In the adhesive layer 150, a dot 160 may be provided at a portion corresponding to the center of the piezoelectric element 110. The dot 160 is harder than the adhesive layer 150, and may serve to more reliably transmit the external force applied to the cover 130 to the piezoelectric element 110. In some embodiments, the dot 160 may be omitted. However, the sensitivity may be further improved due to the dot 160.
손가락 등에 의하여 커버(130)에 외력(F)이 가해지면, 도 5b에 도시된 바와 같이 공간(S) 내에서 압전 소자(110)가 변형을 일으키고, 이에 따라 제1,2 외부 전극(111a, 111b)에서 검출되는 전압을 측정함으로써 외력 또는 접촉을 검출할 수 있다.When the external force F is applied to the cover 130 by a finger or the like, the piezoelectric element 110 deforms in the space S as shown in FIG. 5B, and thus the first and second external electrodes 111a, External force or contact can be detected by measuring the voltage detected in 111b).
도 6a는 본 발명의 제3 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이고, 도 6b는 도 6a의 버튼 장치에 외력(또는 접촉)(F)이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.6A is a side view of a button device using a piezoelectric element according to a third embodiment of the present invention, and FIG. 6B is a state in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 6A. Shows an example.
본 실시예에 따른 버튼 장치는, 압전 소자(210), 지지판(220), 커버(230), 스페이서(240), 필라부재(245), 댐퍼층(250)을 포함한다.The button device according to the present embodiment includes a piezoelectric element 210, a support plate 220, a cover 230, a spacer 240, a pillar member 245, and a damper layer 250.
지지판(220)은 그 위에 놓인 스페이서(240), 압전 소자(210), 필라부재(245), 커버(230) 등을 지지하는 역할을 한다. 지지판(220)은 예컨대 강화유리, 에폭시 등으로 제작될 수 있다.The support plate 220 supports the spacer 240, the piezoelectric element 210, the pillar member 245, the cover 230, and the like placed thereon. The support plate 220 may be made of, for example, tempered glass, epoxy, or the like.
압전 소자(210)는 압전체(212) 및 플레이트(213)를 포함한다.The piezoelectric element 210 includes a piezoelectric element 212 and a plate 213.
압전체(212)는 일면(도 6에서는 하면)에 제1 외부 전극(211a) 및 제2 외부 전극(211b)이 형성된다. 압전체(212)는 수정, 전기석(tourmaline), 티탄산 지르콘산 연(PZT), 로셸염(Rochelle salt), 타이타늄산바륨(barium titanate), 인산이수소암모늄(Monoammonium Phosphate), 타타르산에틸렌다이아민 등의 압전성이 뛰어난 재료를 이용하여 제작될 수 있다. 압전체(212)는 한쪽면에 제1 외부 전극(211a) 및 제2 외부 전극(211b)이 형성된 적층형 압전체인 것이 바람직하며, 압전체(212)의 구체적인 예는 도 7를 참조하여 후술하기로 한다.The piezoelectric material 212 is provided with a first external electrode 211a and a second external electrode 211b on one surface (lower surface in FIG. 6). The piezoelectric material 212 is made of quartz, tourmaline, lead zirconate titanate (PZT), Rochelle salt, barium titanate, monoammonium phosphate, ethylene tartarate, etc. It can be produced using a material having excellent piezoelectricity. The piezoelectric material 212 is preferably a laminated piezoelectric material having a first external electrode 211a and a second external electrode 211b formed on one surface thereof, and a specific example of the piezoelectric material 212 will be described later with reference to FIG. 7.
플레이트(213)는 전형적으로 금속제로서, 예컨대 스테인레스 재질일 수 있으며, 압전체(212)보다 큰 면적을 가진다. Plate 213 is typically metallic, for example stainless steel, and has a larger area than piezoelectric material 212.
플레이트(213)는 압전체(213)의 일면, 즉 제1 및 제2 외부 전극(211a, 211b)이 형성된 면에 부착된다. 압전체(212)와 플레이트(213)는 접착제(214)에 의해 부착될 수 있다.The plate 213 is attached to one surface of the piezoelectric body 213, that is, the surface on which the first and second external electrodes 211a and 211b are formed. The piezoelectric body 212 and the plate 213 may be attached by the adhesive 214.
플레이트(213)에는 제1 및 제2 외부 전극(211a, 211b)에 해당하는 위치에 각각 제1 및 제2 외부 전극(211a, 211b)을 수용하는 홀(Ca, Cb)이 형성된다. 홀(Ca, Cb)의 크기는 제1 및 제2 외부 전극(211a, 211b)의 크기보다 약간 큰 것이 바람직하다. In the plate 213, holes C a and C b are formed to receive the first and second external electrodes 211 a and 211 b at positions corresponding to the first and second external electrodes 211 a and 211 b , respectively. Preferably, the sizes of the holes C a and C b are slightly larger than those of the first and second external electrodes 211a and 211b.
플레이트(213)와 제1 및 제2 외부 전극(211a, 211b)은 절연되어야 하므로, 플레이트(213)는 홀(Ca, Cb)의 내주면을 포함하여 그 표면이 절연처리되어 있는 것이 바람직하다. 예컨대 플레이트(213)는 절연 스프레이로 절연처리되거나, 절연 코팅될 수 있다. Plate 213 and the first and second, because the external electrodes (211a, 211b) is to be isolated, the plate 213 is preferably the surface is insulated, including an inner peripheral surface of a hole (C a, C b) . For example, the plate 213 may be insulated or coated with an insulating spray.
지지판(220)은 플레이트(213)의 일면(도 6에서는 하면) 측에 배치되고, 플레이트(213)의 일면의 가장자리와 지지판(220) 사이에는 스페이서(240)가 마련된다. 스페이스(240)는 플레이트(213)의 일면의 가장자리를 지지하며 커버(230)에 가해지는 외력에 의하여 압전 소자(210)가 변형될 수 있는 공간(S)을 제공한다. The support plate 220 is disposed on one surface (lower surface in FIG. 6) of the plate 213, and a spacer 240 is provided between the edge of one surface of the plate 213 and the support plate 220. The space 240 supports the edge of one surface of the plate 213 and provides a space S in which the piezoelectric element 210 may be deformed by an external force applied to the cover 230.
플레이트(213)와 스페이서(240)는 접착제에 의해 부착될 수 있고, 스페이서(240)와 지지판(220) 역시 접착제에 의해 부착될 수 있다. The plate 213 and the spacer 240 may be attached by an adhesive, and the spacer 240 and the supporting plate 220 may also be attached by an adhesive.
압전체(212)와 플레이트(213)의 모양이 예컨대 원형인 경우, 공간(S) 역시 원형이 되도록 스페이서(240)가 구현될 수 있다. 압전체(212)와 플레이트(213)의 모양은 원형 이외의 다른 형상(예컨대 삼각 또는 사각)일 수 있으며, 이 경우 공간(S) 역시 삼각 또는 사각 형태가 되도록 스페이서(240)가 구현될 수 있다.When the piezoelectric body 212 and the plate 213 have a circular shape, for example, the spacer 240 may be implemented so that the space S is also circular. The piezoelectric body 212 and the plate 213 may have shapes other than circular (eg, triangular or square), and in this case, the spacer 240 may be implemented such that the space S is also triangular or square.
압전체(212)의 타면(도 6에서는 상면) 측에는 커버(230)가 배치된다.The cover 230 is disposed on the other surface (upper surface in FIG. 6) of the piezoelectric body 212.
압전체(212)의 타면과 커버(230) 사이에는 댐퍼층(250)이 구비될 수 있다. 댐퍼층(250)은 예컨대 우레탄 등의 재질로서, 버튼 장치의 조립성을 향상시키는 역할을 할 수 있다. 예컨대 댐퍼층(250)은 커버(230)가 평평하지 않은 경우 커버(230)의 형상과 그 아래 요소들의 형상을 정합하는 역할을 할 수 있다. 실시예에 따라서 댐퍼층(250)은 생략될 수도 있다.A damper layer 250 may be provided between the other surface of the piezoelectric body 212 and the cover 230. The damper layer 250 may be, for example, a material such as urethane, and may serve to improve the assemblability of the button device. For example, the damper layer 250 may serve to match the shape of the cover 230 and the shape of the elements below the cover 230 when the cover 230 is not flat. In some embodiments, the damper layer 250 may be omitted.
압전체(212)와 댐퍼층(250)은 제1 접착제층(251)에 의해 부착되고, 댐퍼층(250)과 커버(230)는 제2 접착제층(252)에 의해 부착될 수 있다. 댐퍼층(250)이 없는 경우 압전체(212)와 커버(230) 사이에 접착제층이 구비될 수 있다. The piezoelectric material 212 and the damper layer 250 may be attached by the first adhesive layer 251, and the damper layer 250 and the cover 230 may be attached by the second adhesive layer 252. When there is no damper layer 250, an adhesive layer may be provided between the piezoelectric body 212 and the cover 230.
제1 접착제층(251), 댐퍼층(250), 제2 접착제층(252) 내에는 압전 소자(210)의 중심을 기준으로 일정 영역에 해당하는 부분에 도트(dot)(260)가 마련될 수 있다. 도트(260)는 제1 접착제층(251), 댐퍼층(250), 제2 접착제층(252)보다 경질의 재질로서, 커버(230)에 가해지는 외력을 압전 소자(210)로 보다 신뢰성 있게 전달하거나, 압전 소자(210)의 진동을 보다 확실하게 커버(230)로 전달하는 역할을 할 수 있다. 실시예에 따라서, 도트(260)는 댐퍼층(250) 내에만 마련될 수도 있다. 댐퍼층(250)이 없는 경우 도트(260)는 접착제층 내에 마련될 수 있다. 실시예에 따라서 도트(260)는 생략될 수도 있다. 다만 도트(260)로 인하여 버튼 장치의 감도가 보다 개선될 수 있다.In the first adhesive layer 251, the damper layer 250, and the second adhesive layer 252, a dot 260 may be provided at a portion corresponding to a predetermined region with respect to the center of the piezoelectric element 210. Can be. The dot 260 is a harder material than the first adhesive layer 251, the damper layer 250, and the second adhesive layer 252, and the piezoelectric element 210 more reliably applies the external force applied to the cover 230. Or may transmit a vibration of the piezoelectric element 210 to the cover 230 more reliably. In some embodiments, the dot 260 may be provided only in the damper layer 250. In the absence of the damper layer 250, the dot 260 may be provided in the adhesive layer. In some embodiments, the dot 260 may be omitted. However, the sensitivity of the button device may be further improved due to the dot 260.
스페이서(240)와 커버(230) 사이에는(혹은, 스페이서(240)와 댐퍼층(250) 사이에는), 압전 소자(210)를 둘러싸며 댐퍼층(250)과 커버(230)를 받치는 필라부재(245)가 마련될 수 있다. Between the spacer 240 and the cover 230 (or between the spacer 240 and the damper layer 250), a pillar member surrounding the piezoelectric element 210 and supporting the damper layer 250 and the cover 230. 245 may be provided.
필라부재(245)와 댐퍼층(250)은 제1 접착제층(251)에 의해 부착될 수 있다. 댐퍼층(250)이 없는 경우 필라부재(245)와 커버(230) 사이에 접착제층이 구비될 수 있다. The pillar member 245 and the damper layer 250 may be attached by the first adhesive layer 251. When there is no damper layer 250, an adhesive layer may be provided between the pillar member 245 and the cover 230.
필라부재(245)와 스페이서(240) 역시 접착제에 의해 부착될 수 있다. 실시예에 따라서는, 필라부재(245)와 스페이서(240)는 일체형으로 구현될 수도 있다.The pillar member 245 and the spacer 240 may also be attached by an adhesive. According to the exemplary embodiment, the pillar member 245 and the spacer 240 may be integrally implemented.
손가락 등에 의하여 커버(230)에 외력(F)이 가해지면, 도 6b에 도시된 바와 같이 공간(S) 내에서 압전 소자(210)가 변형을 일으키고, 이에 따라 제1, 2 외부 전극(211a, 211b)에서 검출되는 전압을 측정함으로써 외력 또는 접촉을 검출할 수 있다.When the external force F is applied to the cover 230 by a finger or the like, the piezoelectric element 210 deforms in the space S as shown in FIG. 6B, and thus the first and second external electrodes 211a, External force or contact can be detected by measuring the voltage detected in 211b).
반대로 압전 소자(210)의 제1, 2 외부 전극(211a, 211b)에 전기적 신호를 가하여 압전 소자(210)의 진동이 발생하는 경우, 예컨대 손가락을 커버(230)에 접촉한 사용자는 진동을 느낌으로서 피드백을 받을 수 있다. On the contrary, when vibration of the piezoelectric element 210 occurs by applying electrical signals to the first and second external electrodes 211a and 211b of the piezoelectric element 210, for example, a user who touches the finger on the cover 230 feels vibration. You can get feedback as
도시되지는 않았으나, 제1, 2 외부 전극(211a, 211b)에서 검출되는 전압을 측정하거나 제1, 2 외부 전극(211a, 211b)에 전기적 신호를 인가하기 위하여, 제1, 2 외부 전극(211a, 211b)과 각각 연결되는 도선 패턴이 형성된 연성회로기판이 구비될 수 있다. 실시예에 따라서는, 연성회로기판 대신에 제1, 2 외부 전극(211a, 211b)에 와이어가 연결될 수도 있다. Although not shown, the first and second external electrodes 211a are used to measure the voltage detected by the first and second external electrodes 211a and 211b or to apply an electrical signal to the first and second external electrodes 211a and 211b. 211b) may be provided with a flexible printed circuit board having conductive patterns respectively connected thereto. In some embodiments, a wire may be connected to the first and second external electrodes 211a and 211b instead of the flexible circuit board.
이러한 연성회로기판 또는 와이어는 제1, 2 외부 전극(211a, 211b)에서 검출되는 전압을 측정하거나 제1, 2 외부 전극(211a, 211b)에 전기적 신호를 인가하는 회로 장치(미도시)와 연결될 수 있다.The flexible circuit board or wire may be connected to a circuit device (not shown) that measures a voltage detected by the first and second external electrodes 211a and 211b or applies an electrical signal to the first and second external electrodes 211a and 211b. Can be.
또한 제1, 2 외부 전극(211a, 211b)의 절연을 위하여, 제1 및 제2 외부 전극(211a, 211b)을 수용하는 홀(Ca, Cb)에는 절연 몰딩(예컨대, 에폭시 몰딩)이 채워질 수 있다.In addition, in order to insulate the first and second external electrodes 211a and 211b, an insulation molding (eg, epoxy molding) is formed in the holes C a and C b that accommodate the first and second external electrodes 211a and 211b. Can be filled.
도 7은 본 발명의 일 실시예에 따른 압전 소자(210)의 측면도 및 평면도이다. 7 is a side view and a plan view of a piezoelectric element 210 according to an embodiment of the present invention.
압전체(212)는 일면에 제1 및 제2 외부 전극(211a, 211b)이 형성되고, 내부에 복수의 압전층(215)이 적층되며, 압전층(215) 사이에는 적층 방향으로 서로 다른 극성을 가지도록 교번하는 제1 및 제2 내부 전극(216a, 216b)이 개재된다. 제1 및 제2 외부 전극(211a, 211b)과 제1 및 제2 내부 전극(216a, 216b)은 각각 제1 및 제2 도전성 비아(217a, 217b)를 이용하여 전기적으로 연결된다.The piezoelectric material 212 has first and second external electrodes 211a and 211b formed on one surface thereof, and a plurality of piezoelectric layers 215 are stacked therein, and the piezoelectric layers 215 have different polarities in the stacking direction. The first and second internal electrodes 216a and 216b alternately intersect with each other. The first and second external electrodes 211a and 211b and the first and second internal electrodes 216a and 216b are electrically connected to each other using the first and second conductive vias 217a and 217b, respectively.
제1 및 제2 외부 전극(211a, 211b)에는 각각 와이어(219a, 219b)가 연결된다. 앞서 설명한 바와 같이, 와이어(219a, 219b) 대신에, 제1, 2 외부 전극(211a, 211b)과 각각 연결되는 도선 패턴이 형성된 연성회로기판이 이용될 수도 있다. Wires 219a and 219b are connected to the first and second external electrodes 211a and 211b, respectively. As described above, instead of the wires 219a and 219b, a flexible circuit board having conductive patterns connected to the first and second external electrodes 211a and 211b may be used.
압전체(212)의 일면에는 접착제(214)에 의해 플레이트(213)가 부착된다. 플레이트(213)에 형성된, 제1 및 제2 외부 전극(211a, 211b)을 수용하는 홀(Ca, Cb)에는 각각 절연 몰딩(218a, 218b)이 채워진다. The plate 213 is attached to one surface of the piezoelectric body 212 by an adhesive 214. Formed in the plate 213, a first and a second is filled with the insulating molding each (218a, 218b), the external electrodes (211a, 211b) holes (C a, C b) for receiving.
도 8은 압전 소자(210)가 받게 되는 스트레스를 설명하기 위한 도면이다. 8 is a view for explaining the stress that the piezoelectric element 210 receives.
압전 소자(210)에 외력이 가해지거나 압전 소자(210)가 진동하는 경우, 변위는 가운데 부분(A)이 가장 크고, 응력은 스페이서(240)에 고정된 가장자리 부분(B)이 가장 크다. 이처럼 스트레스가 많이 가해지는 부분(A, B)에 외부 전극(211a, 211b)이 배치된다면(또한 도 7에서처럼 외부 전극(211a, 211b)에 대응하여 압전체(212)의 내부에는 도전성 비아(217a, 217b)도 배치된다), 외부 전극, 도전성 비아, 내부 전극, 와이어(또는 연성회로기판) 등이 파손되거나 이들 간의 연결이 손상될 수 있다. When an external force is applied to the piezoelectric element 210 or the piezoelectric element 210 vibrates, the displacement is the largest in the center portion A, and the stress is the largest in the edge portion B fixed to the spacer 240. If the external electrodes 211a and 211b are disposed in the stressed portions A and B (also as shown in FIG. 7), the conductive vias 217a and 217b may be formed inside the piezoelectric body 212 corresponding to the external electrodes 211a and 211b. 217b), external electrodes, conductive vias, internal electrodes, wires (or flexible printed circuit boards), etc. may be damaged or the connections therebetween may be damaged.
본 발명의 발명자는 압전 소자(210)의 변위와 응력으로 인한 영향을 최소화시킬 수 있는 외부 전극의 위치와 범위를 실험과 시뮬레이션 등을 통하여 연구하였다. 그 결과 압전체(212)의 중심으로부터 압전체(212)의 가장자리 끝 사이의 중간 지점을 기준으로, 압전체(212)의 중심에서 가장자리 끝까지의 거리의 30% 이내인 지점 사이에서 변위와 응력의 영향이 거의 없음을 확인하였다. The inventor of the present invention studied the position and range of the external electrode that can minimize the effects of the displacement and stress of the piezoelectric element 210 through experiments and simulations. As a result, the influence of displacement and stress is substantially between the points within 30% of the distance from the center of the piezoelectric element 212 to the edge end with respect to the intermediate point between the center of the piezoelectric element 212 and the edge end of the piezoelectric element 212. It was confirmed that none.
도 9는 본 발명의 실시예에서 제안하는, 압전체(212)에서의 제1 및 제2 외부 전극(211a, 211b)의 바람직한 위치를 나타낸다. 9 shows preferred positions of the first and second external electrodes 211a and 211b in the piezoelectric body 212 as proposed in the embodiment of the present invention.
도 9를 참조하면, 압전체(212)의 중심을 O, 압전체(212)의 중심에서 가장자리 끝까지의 거리를 R이라 하면, 그 중간 지점은 R/2이 되고, 제1, 제2 외부 전극(211a, 211b)은 그 중심이 상기 R/2 지점으로부터 R의 30% 이내인 지점, 즉 R/2 지점으로부터 양쪽으로 0.3R 이내에 배치되는 것이 바람직하다.Referring to FIG. 9, when the center of the piezoelectric body 212 is O and the distance from the center of the piezoelectric body 212 to the edge is R, the intermediate point is R / 2, and the first and second external electrodes 211a are , 211b) is preferably disposed within 0.3 R from the R / 2 point to within 30% of R, ie from the R / 2 point.
예컨대, 압전체(212)의 지름이 10mm(즉, R=5mm)인 경우, 압전체(212)의 중심으로부터 2.5mm(2/R) 지점을 기준으로 양쪽으로 각각 1.5mm 이내의 범위에 외부 전극의 중심이 놓이게 되면, 압전 소자(210)의 변위와 응력으로 인한 영향을 최소화시킬 수 있다.For example, when the diameter of the piezoelectric body 212 is 10 mm (that is, R = 5 mm), the external electrode may be positioned within 1.5 mm on both sides of the 2.5 mm (2 / R) point from the center of the piezoelectric body 212. When the center is placed, the influence of the displacement and the stress of the piezoelectric element 210 can be minimized.
도 10a는 본 발명의 제4 실시예에 따른 압전 소자를 이용한 버튼 장치의 측면도이고, 도 10b는 도 10a의 버튼 장치에 외력(또는 접촉)(F)이 가해지는 경우에 압전 소자가 변형되는 모습의 예를 보여준다.FIG. 10A is a side view of a button device using a piezoelectric element according to a fourth embodiment of the present invention, and FIG. 10B is a view in which the piezoelectric element is deformed when an external force (or contact) F is applied to the button device of FIG. 10A. Shows an example.
도 6a에 도시된 버튼 장치는 댐퍼층(250)과 제1 접착제층(251) 및 제2 접착제층(252)이 압전체(212)와 필라부재(245)를 전체적으로 덮고 있고 도트(260)가 댐퍼층(250)과 제1 접착제층(251) 및 제2 접착제층(252) 내에 마련되는 구조이다.In the button device illustrated in FIG. 6A, the damper layer 250, the first adhesive layer 251, and the second adhesive layer 252 entirely cover the piezoelectric body 212 and the pillar member 245, and the dot 260 is damper. The structure is provided in the layer 250, the first adhesive layer 251, and the second adhesive layer 252.
이에 반해 본 실시예에 따른 버튼 장치는 댐퍼층(250')과 제1 접착제층(251') 및 제2 접착제층(252')이 압전체(212)는 덮지 않으면서 필라부재(245)만을 덮고 있는 구조이다.In contrast, in the button device according to the present embodiment, the damper layer 250 ′, the first adhesive layer 251 ′, and the second adhesive layer 252 ′ cover only the pillar member 245 without covering the piezoelectric body 212. It is a structure.
즉, 댐퍼층(250')과 제1 접착제층(251') 및 제2 접착제층(252')도 필라부재(245)와 마찬가지로 압전 소자(210)를 둘러싸는 형태로서, 필라부재(245)와 댐퍼층(250')이 커버(230)를 받치면서 댐퍼층(250')은 압전체(212)와 커버(230) 사이에 이격 공간을 제공한다. 그리고 이 이격 공간 내에 압전체(212)의 중심을 기준으로 일정 영역에 해당하는 부분에 도트(260)가 마련된다.In other words, the damper layer 250 ′, the first adhesive layer 251 ′, and the second adhesive layer 252 ′, like the pillar member 245, surround the piezoelectric element 210. And the damper layer 250 ′ supports the cover 230, and the damper layer 250 ′ provides a space between the piezoelectric body 212 and the cover 230. A dot 260 is provided in a portion corresponding to a predetermined region with respect to the center of the piezoelectric body 212 in the space.
압전 소자(210)의 진동은 압전 소자(210)를 도 10에서 아래쪽(즉, 지지판(220) 쪽)으로 볼록하도록 변형시킬 뿐만 아니라, 위쪽(즉, 커버(230) 쪽)으로도 볼록하도록 변형시킨다. 댐퍼층(250')이 제공하는 이격 공간은 압전 소자(210)가 위쪽으로 볼록하게 변형되는 것을 보다 용이하게 할 수 있다.The vibration of the piezoelectric element 210 not only deforms the piezoelectric element 210 to be convex downward in FIG. 10 (ie, toward the support plate 220), but also convexly upward (ie, toward the cover 230). Let's do it. The space provided by the damper layer 250 ′ may make it easier for the piezoelectric element 210 to be convexly deformed upward.
이처럼 본 실시예에서는 댐퍼층(250')이 이격 공간을 제공함으로써 압전 소자(210)의 진동을 원활하게 하여, 압전 소자(210)의 진동을 사용자에게 효과적으로 전달할 수 있다. As described above, in the present embodiment, the damper layer 250 ′ provides a separation space to smoothly vibrate the piezoelectric element 210, thereby effectively transmitting the vibration of the piezoelectric element 210 to the user.
이제까지 본 발명에 대하여 그 바람직한 실시예들을 중심으로 살펴보았다. 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자는 본 발명이 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 변형된 형태로 구현될 수 있음을 이해할 수 있을 것이다. 그러므로 개시된 실시예들은 한정적인 관점이 아니라 설명적인 관점에서 고려되어야 한다. 본 발명의 범위는 전술한 설명이 아니라 특허청구범위에 나타나 있으며, 그와 동등한 범위 내에 있는 모든 차이점은 본 발명에 포함된 것으로 해석되어야 할 것이다.So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Claims (19)

  1. 압전 소자를 이용한 버튼 장치로서,A button device using a piezoelectric element,
    일면에 제1 외부 전극 및 제2 외부 전극이 형성된 압전체 및 일면이 상기 압전체의 타면에 부착되는 플레이트로 이루어지는 압전 소자;A piezoelectric element including a piezoelectric body having a first external electrode and a second external electrode formed on one surface thereof, and a plate on which one surface is attached to the other surface of the piezoelectric body;
    상기 압전체의 일면 측에 배치되는 지지판;A support plate disposed on one side of the piezoelectric body;
    상기 플레이트의 타면에 부착되는 커버; 및A cover attached to the other surface of the plate; And
    상기 커버에 가해지는 외력에 의하여 상기 압전 소자가 변형될 수 있는 공간을 제공하도록 상기 지지판과 상기 플레이트 사이에 마련되는 스페이서를 포함하는 버튼 장치.And a spacer provided between the support plate and the plate to provide a space in which the piezoelectric element may be deformed by an external force applied to the cover.
  2. 제1항에 있어서,The method of claim 1,
    상기 플레이트와 상기 커버 사이의 접착제층을 더 포함하는 버튼 장치.The button device further comprises an adhesive layer between the plate and the cover.
  3. 제2항에 있어서,The method of claim 2,
    상기 접착제층 내에 마련되어 상기 외력을 상기 압전 소자로 전달하는 도트를 더 포함하는 버튼 장치.The button device further comprises a dot provided in the adhesive layer for transmitting the external force to the piezoelectric element.
  4. 제3항에 있어서,The method of claim 3,
    상기 도트는 상기 접착제층보다 경질인 버튼 장치.The dot device is harder than the adhesive layer.
  5. 제1항에 있어서,The method of claim 1,
    상기 제1 외부 전극 및 상기 제2 외부 전극과 각각 연결되는 도선 패턴이 형성된 연성회로기판을 더 포함하는 버튼 장치.The button device further comprises a flexible printed circuit board having conductive patterns connected to the first external electrode and the second external electrode.
  6. 제1항에 있어서,The method of claim 1,
    상기 압전체는 적층형 압전체인 버튼 장치.And the piezoelectric body is a laminated piezoelectric button device.
  7. 제1항에 있어서,The method of claim 1,
    상기 압전체의 일면에는 더미 전극이 더 형성되고, 상기 제1, 제2 외부 전극 및 상기 더미 전극을 포함하는 전극들이 서로 대칭을 이루도록 배치되는 버튼 장치.A dummy electrode is further formed on one surface of the piezoelectric material, and the first and second external electrodes and the electrode including the dummy electrode are arranged to be symmetrical with each other.
  8. 제1항에 있어서,The method of claim 1,
    상기 제2 외부 전극은 환형으로 형성되고, 상기 제1 외부 전극은 상기 환형의 안쪽에 형성되는 버튼 장치.And the second external electrode is formed in an annular shape, and the first external electrode is formed inside the annular shape.
  9. 압전 소자를 이용한 버튼 장치로서,A button device using a piezoelectric element,
    일면에 제1 및 제2 외부 전극이 형성된 압전체 및 상기 압전체의 일면에 부착되며 상기 제1 및 제2 외부 전극에 해당하는 위치에 각각 상기 제1 및 제2 외부 전극을 수용하는 홀이 형성된 플레이트로 이루어지는 압전 소자;A plate formed with a piezoelectric body having first and second external electrodes formed on one surface thereof and a hole formed on one surface of the piezoelectric body and receiving the first and second external electrodes formed at positions corresponding to the first and second external electrodes respectively; Piezoelectric element made;
    상기 압전체의 타면 측에 배치되는 커버; 및A cover disposed on the other surface side of the piezoelectric body; And
    상기 플레이트의 일면의 가장자리를 지지하며 상기 커버에 가해지는 외력에 의하여 상기 압전 소자가 변형될 수 있는 공간을 제공하는 스페이서를 포함하는 버튼 장치.And a spacer supporting an edge of one surface of the plate and providing a space in which the piezoelectric element may be deformed by an external force applied to the cover.
  10. 제9항에 있어서,The method of claim 9,
    상기 압전체는 적층형 압전체인 버튼 장치.And the piezoelectric body is a laminated piezoelectric button device.
  11. 제9항에 있어서,The method of claim 9,
    상기 압전 소자를 둘러싸며 상기 스페이서와 상기 커버 사이에 마련되어 상기 커버를 받치는 필라부재를 더 포함하는 버튼 장치.And a pillar member surrounding the piezoelectric element and provided between the spacer and the cover to support the cover.
  12. 제11항에 있어서,The method of claim 11,
    상기 스페이서와 상기 필라부재는 일체로 형성되는 버튼 장치.The spacer device and the pillar member is formed integrally.
  13. 제9항에 있어서,The method of claim 9,
    상기 플레이트는 표면이 절연처리되어 있는 버튼 장치.The plate is a button device surface is insulated.
  14. 제9항에 있어서,The method of claim 9,
    상기 압전체의 타면과 상기 커버 사이의 댐퍼층을 더 포함하는 버튼 장치.And a damper layer between the other surface of the piezoelectric body and the cover.
  15. 제14항에 있어서,The method of claim 14,
    상기 댐퍼층 내에 마련되어 상기 외력을 상기 압전 소자로 전달하는 도트를 더 포함하는 버튼 장치.And a dot provided in the damper layer to transmit the external force to the piezoelectric element.
  16. 제15항에 있어서,The method of claim 15,
    상기 도트는 상기 댐퍼층보다 경질인 버튼 장치.The dot device is harder than the damper layer.
  17. 제9항에 있어서,The method of claim 9,
    상기 압전 소자를 둘러싸며 상기 스페이서 상에 마련되는 필라부재; A pillar member surrounding the piezoelectric element and provided on the spacer;
    상기 필라부재와 상기 커버 사이에 마련되어 상기 필라부재와 함께 상기 커버를 받치며 상기 압전체와 상기 커버 사이에 이격 공간을 제공하는 댐퍼층; 및A damper layer provided between the pillar member and the cover to support the cover together with the pillar member and to provide a space between the piezoelectric member and the cover; And
    상기 이격 공간 내에 마련되어 상기 외력을 상기 압전 소자로 전달하거나 상기 압전 소자의 진동을 상기 커버로 전달하는 도트를 더 포함하는 버튼 장치.And a dot provided in the separation space to transfer the external force to the piezoelectric element or to transmit vibration of the piezoelectric element to the cover.
  18. 제9항에 있어서,The method of claim 9,
    상기 제1 및 제2 외부 전극을 수용하는 홀에는 절연 몰딩이 채워지는 버튼 장치.The button device is filled with an insulating molding in the hole for receiving the first and second external electrodes.
  19. 제9항에 있어서,The method of claim 9,
    상기 제1 및 제2 외부 전극은 각각, 상기 압전체의 중심으로부터 상기 압전체의 가장자리 끝 사이의 중간 지점을 기준으로 상기 중심에서 상기 가장자리 끝까지의 거리의 30% 이내에 상기 제1 및 제2 외부 전극의 중심이 위치하도록 배치되는 버튼 장치.The first and second external electrodes are respectively centered on the first and second external electrodes within 30% of the distance from the center to the edge end with respect to an intermediate point between the center of the piezoelectric body and the edge end of the piezoelectric body. Button device arranged to be located.
PCT/KR2016/007287 2015-07-20 2016-07-06 Button device using piezoelectric element WO2017014452A1 (en)

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KR1020150102293A KR102193906B1 (en) 2015-07-20 2015-07-20 Button device using piezoelectric element
KR1020150110930A KR102193908B1 (en) 2015-08-06 2015-08-06 Button device using piezoelectric element
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WO2021209816A1 (en) * 2020-04-13 2021-10-21 Stelect Pty. Ltd Ultrasound transducers

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