WO2013171913A1 - 圧電アクチュエータ、圧電振動装置および携帯端末 - Google Patents
圧電アクチュエータ、圧電振動装置および携帯端末 Download PDFInfo
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- WO2013171913A1 WO2013171913A1 PCT/JP2012/072198 JP2012072198W WO2013171913A1 WO 2013171913 A1 WO2013171913 A1 WO 2013171913A1 JP 2012072198 W JP2012072198 W JP 2012072198W WO 2013171913 A1 WO2013171913 A1 WO 2013171913A1
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- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/872—Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/50—Piezoelectric or electrostrictive devices having a stacked or multilayer structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
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- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
- H10N30/2047—Membrane type
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N30/206—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Definitions
- the present invention relates to a piezoelectric vibration device, a piezoelectric actuator suitable for a mobile terminal, a piezoelectric vibration device, and a mobile terminal.
- a bimorph type piezoelectric element 10 in which a surface electrode 104 is formed on the surface of a laminate 103 in which a plurality of internal electrodes 101 and a plurality of piezoelectric layers 102 are laminated, (Refer to Patent Document 1), a flexible substrate 105 is joined to the main surface of the piezoelectric element 10 with a conductive joining member 106, and the surface electrode 104 of the piezoelectric element 10 and the wiring conductor 107 of the flexible substrate 105 are electrically connected. It is known (see Patent Document 2).
- the abnormal flexible substrate 105 does not follow the vibration of the actuator due to external vibration or resonance of the flexible substrate 105 itself. Due to the vibration, a stress concentration load is applied to the base of the joint, and the flexible substrate 105 is peeled off from the piezoelectric element.
- the present invention has been devised in view of the above-described problems, and the object of the present invention is to be stable for a long time without peeling from the piezoelectric element even if the flexible substrate bonded to the piezoelectric element is driven for a long time.
- a piezoelectric actuator, a piezoelectric vibration device, and a portable terminal are provided.
- the piezoelectric actuator of the present invention includes a piezoelectric element including a laminate in which an internal electrode and a piezoelectric layer are laminated, and a surface electrode electrically connected to the internal electrode on one main surface of the laminate, A flexible substrate having a wiring conductor partially connected to the main surface via a conductive bonding member and electrically connected to the surface electrode, and at least the flexible substrate on the one main surface
- the region in which is bonded is characterized in that the flatness is worse than that of the other main surface.
- the piezoelectric vibration device includes the piezoelectric actuator and a vibration plate bonded to the other main surface of the piezoelectric element.
- the portable terminal of the present invention includes the piezoelectric actuator, an electronic circuit, a display, and a housing, and the other main surface of the piezoelectric actuator is joined to the display or the housing. It is characterized by.
- the present invention it is possible to obtain a piezoelectric actuator that can be driven stably for a long period of time without peeling from the piezoelectric element even if the flexible substrate bonded to the piezoelectric element is driven for a long period of time.
- FIG. 1 is a schematic perspective view schematically showing a piezoelectric vibration device according to an embodiment of the present invention. It is a schematic perspective view which shows typically the portable terminal of embodiment of this invention.
- FIG. 5 is a schematic sectional view taken along line AA shown in FIG. 4.
- FIG. 5 is a schematic sectional view taken along line BB shown in FIG. 4.
- A) is a schematic perspective view which shows an example of embodiment of the conventional piezoelectric actuator
- (b) is a schematic sectional drawing cut
- FIG. 1A is a schematic perspective view showing an example of an embodiment of the piezoelectric actuator of the present invention
- FIG. 1B is a schematic cross-sectional view taken along the line AA shown in FIG. .
- a piezoelectric actuator 1 according to this embodiment shown in FIG. 1 includes a laminate 4 in which an internal electrode 2 and a piezoelectric layer 3 are laminated, and a surface electrode electrically connected to the internal electrode 2 on one main surface of the laminate 4. 5 and a flexible substrate 6 having a wiring conductor 61 partially bonded to one main surface via a conductive bonding member 7 and electrically connected to the surface electrode 5.
- a region of the one main surface where the flexible substrate 6 is bonded has a lower flatness than the other main surface.
- the laminated body 4 constituting the piezoelectric element 10 is formed by laminating the internal electrode 2 and the piezoelectric layer 3, and includes an active portion 41 in which a plurality of internal electrodes 2 overlap in the laminating direction and other inactive portions 42. For example, it is formed in a long shape.
- the length of the laminate 4 is preferably, for example, 18 mm to 28 mm, and more preferably 22 mm to 25 mm.
- the width of the laminate 4 is preferably 1 mm to 6 mm, and more preferably 3 mm to 4 mm.
- the thickness of the laminate 4 is preferably 0.2 mm to 1.0 mm, and more preferably 0.4 mm to 0.8 mm.
- the internal electrode 2 constituting the laminated body 4 is formed by simultaneous firing with ceramics forming the piezoelectric layer 3 and includes a first electrode 21 and a second electrode 22.
- the first electrode 21 is a ground electrode
- the second electrode 22 is a positive electrode or a negative electrode.
- Piezoelectric layers 3 are alternately stacked to sandwich the piezoelectric layers 3 from above and below, and the first pole 21 and the second pole 22 are arranged in the stacking order, so that the piezoelectric body sandwiched between them.
- a driving voltage is applied to the layer 3.
- a conductor mainly composed of silver or a silver-palladium alloy having a low reactivity with piezoelectric ceramics, or a conductor containing copper, platinum, or the like can be used. It may be included.
- the end portions of the first pole 21 and the second pole 22 are alternately led to a pair of side surfaces facing each other of the stacked body 4.
- the length of the internal electrode 2 is preferably 17 mm to 25 mm, for example, and more preferably 21 mm to 24 mm.
- the width of the internal electrode 2 is preferably 1 mm to 5 mm, and more preferably 2 mm to 4 mm.
- the thickness of the internal electrode 2 is preferably 0.1 to 5 ⁇ m, for example.
- the piezoelectric layer 3 constituting the multilayer body 4 is formed of ceramics having piezoelectric characteristics.
- ceramics for example, a perovskite oxide made of lead zirconate titanate (PbZrO 3 -PbTiO 3 ), Lithium niobate (LiNbO 3 ), lithium tantalate (LiTaO 3 ), or the like can be used.
- the thickness of one layer of the piezoelectric layer 3 is preferably set to 0.01 to 0.1 mm, for example, so as to be driven at a low voltage. In order to obtain a large bending vibration, it is preferable to have a piezoelectric d31 constant of 200 pm / V or more.
- a surface electrode 5 electrically connected to the internal electrode 2 is provided on one main surface of the laminate 4.
- the surface electrode 5 in the form shown in FIG. 1 includes a first surface electrode 51 having a large area, a second surface electrode 52 having a small area, and a third surface electrode 53.
- the first surface electrode 51 is electrically connected to the internal electrode 2 to be the first electrode 21
- the second surface electrode 52 is the internal electrode to be the second electrode 22 disposed on one main surface side.
- the third surface electrode 53 is electrically connected to the internal electrode 2 serving as the second electrode 22 disposed on the other main surface side.
- the length of the first surface electrode 51 is preferably, for example, 17 mm to 23 mm, and more preferably 19 mm to 21 mm.
- the width of the first surface electrode 51 is preferably 1 mm to 5 mm, for example, and more preferably 2 mm to 4 mm.
- the lengths of the second surface electrode 52 and the third surface electrode 53 are preferably 1 mm to 3 mm, for example.
- the widths of the second surface electrode 52 and the third surface electrode 53 are preferably 0.5 mm to 1.5 mm, for example.
- the piezoelectric actuator 1 has a flexible substrate 6 partially bonded to one main surface of the laminated body 4 constituting the piezoelectric element 10 via a conductive bonding member 7.
- This flexible substrate 6 includes a wiring conductor 61, and a part of the flexible substrate 6 is one main body of the laminate 4 so that the surface electrode 5 and the wiring conductor 61 are electrically connected via the conductive bonding member 7. It is joined to the surface.
- the flexible substrate 6 is, for example, a flexible printed wiring substrate in which two wiring conductors 61 are embedded in a resin film, and a connector (not shown) for connecting to an external circuit is connected to one end. .
- a conductive adhesive As the conductive bonding member 7, a conductive adhesive, solder, or the like is used, but a conductive adhesive is preferable.
- a conductive adhesive is preferable.
- the conductive adhesive is preferably an anisotropic conductive material.
- the anisotropic conductive material is composed of conductive particles responsible for electrical bonding and a resin adhesive responsible for adhesion.
- connection part with 6 can be made compact.
- region where the flexible substrate 6 of at least one main surface of the laminated body 4 which comprises the piezoelectric element 10 was joined is worse than the other main surface.
- the degree of flatness is poor means that the surface is not relatively flat but has a larger unevenness or step, for example, a flatness of 10 to 200 ⁇ m.
- the bonding area with the conductive bonding member 7 can be increased by reducing the flatness, the bonding strength can be further increased.
- the internal electrode 2 includes a first electrode 21 and a second electrode 22, and the first electrode 21 and the second electrode 22 of the internal electrode 2 are overlapped in the stacking direction.
- a step is provided on one main surface between the active portion 41 having a relatively large thickness and an inactive portion 42 having a relatively small thickness (other than the active portion 41), and the flexible substrate 6 has one main surface.
- the active part 41 may be joined to the inactive part 42.
- the inactive portion 42 may be arranged inside the piezoelectric element 10 as shown in FIG. 2B, in addition to being arranged on the outer periphery of the piezoelectric element 10 as shown in FIG.
- the piezoelectric element 10 is a long body having a longitudinal direction and a width direction
- the internal electrode 2 is a first electrode. 21 and the second pole 22, the central area in the width direction where the first pole 21 and the second pole 22 of the internal electrode 2 overlap with each other in the stacking direction and the other (other than the central area)
- a step is provided on one main surface with the relatively thin end region in the width direction, and the flexible substrate 6 is joined from the center region in the width direction of the one main surface to the end region in the width direction. May be.
- the other main surface of the piezoelectric element 10 flat, for example, when the other main surface is bonded to an object to be vibrated (for example, a vibration plate to be described later), it is integrated with the object to be vibrated. As a result, bending vibration is easily generated, and the efficiency of bending vibration can be improved as a whole.
- an object to be vibrated for example, a vibration plate to be described later
- the piezoelectric actuator 1 shown in FIG. 1 is a so-called bimorph type piezoelectric actuator that receives an electric signal from the surface electrode 5 and vibrates and vibrates so that one main surface and the other main surface are bent surfaces.
- the piezoelectric actuator of the present invention is not limited to the bimorph type, and may be a unimorph type. For example, by joining (bonding) the other principal surface of the piezoelectric actuator to a diaphragm described later, It can be bent and vibrated.
- a ceramic green sheet to be the piezoelectric layer 3 is produced. Specifically, a ceramic slurry is prepared by mixing a calcined powder of piezoelectric ceramic, a binder made of an organic polymer such as acrylic or butyral, and a plasticizer. And a ceramic green sheet is produced using this ceramic slurry by using tape molding methods, such as a doctor blade method and a calender roll method.
- the piezoelectric ceramic any material having piezoelectric characteristics may be used.
- a perovskite oxide made of lead zirconate titanate (PbZrO 3 -PbTiO 3 ) can be used.
- the plasticizer dibutyl phthalate (DBP), dioctyl phthalate (DOP), or the like can be used.
- a conductive paste to be the internal electrode 2 is produced.
- a conductive paste is prepared by adding and mixing a binder and a plasticizer to a metal powder of a silver-palladium alloy.
- This conductive paste is applied on the ceramic green sheet in the pattern of the internal electrode 2 using a screen printing method.
- a plurality of ceramic green sheets printed with this conductive paste are laminated, subjected to a binder removal treatment at a predetermined temperature, fired at a temperature of 900 to 1200 ° C., and then subjected to a predetermined grinding using a surface grinder or the like.
- a surface grinder or the like By performing a grinding process so as to obtain a shape, a laminated body 4 including the internal electrodes 2 and the piezoelectric body layers 3 that are alternately laminated is manufactured.
- a mold or a resin mold having a dent is used as an upper mold (one main surface side) of the press device.
- a flat mold or resin mold as the lower mold (the other main surface side) of the press device, the piezoelectric actuator 1 having the shape shown in FIG. 1B can be manufactured.
- the laminate 4 is not limited to the one produced by the above manufacturing method, and any production method can be used as long as the laminate 4 formed by laminating a plurality of internal electrodes 2 and piezoelectric layers 3 can be produced. It may be produced.
- a silver glass-containing conductive paste prepared by adding a binder, a plasticizer, and a solvent to a mixture of conductive particles mainly composed of silver and glass is used to form a main surface of the laminate 4 in a pattern of the surface electrode 5.
- a baking process is performed at a temperature of 650 to 750 ° C. to form the surface electrode 5.
- a via that penetrates the piezoelectric layer 3 may be formed or connected, or a side electrode may be formed on the side surface of the multilayer body 4. It may be produced by any manufacturing method.
- the flexible substrate 6 is connected and fixed (bonded) to the piezoelectric element 10 using the conductive bonding member 7.
- a conductive bonding member paste is applied and formed at a predetermined position of the piezoelectric element 10 using a technique such as screen printing. Then, the flexible substrate 6 is connected and fixed to the piezoelectric element 10 by curing the conductive bonding member paste in a state where the flexible substrate 6 is brought into contact therewith.
- the conductive bonding member paste may be applied and formed on the flexible substrate 6 side.
- the conductive bonding member 7 is a conductive adhesive
- the resin constituting the conductive adhesive is made of a thermoplastic resin
- the conductive adhesive is placed at a predetermined position on the piezoelectric element 10 or the flexible substrate 6.
- the thermoplastic resin softens and flows by heating and pressurizing the piezoelectric element 10 and the flexible substrate 6 in contact with a conductive adhesive.
- the plastic resin is cured, and the flexible substrate 6 is connected and fixed to the piezoelectric element 10.
- the piezoelectric vibration device of the present invention has a piezoelectric actuator 1 and a diaphragm 81 bonded to the other main surface of the piezoelectric actuator 1 as shown in FIG.
- the diaphragm 81 has a rectangular thin plate shape.
- the vibration plate 81 can be preferably formed using a material having high rigidity and elasticity such as acrylic resin or glass. Further, the thickness of the diaphragm 81 is set to 0.4 mm to 1.5 mm, for example.
- the diaphragm 81 is joined to the other main surface of the piezoelectric actuator 1 via a joining member 82.
- the entire surface of the other main surface may be bonded to the diaphragm 81 via the bonding member 82, or substantially the entire surface may be bonded.
- the joining member 82 has a film shape. Further, the joining member 82 is formed of a material that is softer and more easily deformed than the diaphragm 81, and has a smaller elastic modulus and rigidity such as Young's modulus, rigidity, and bulk modulus than the diaphragm 81. That is, the joining member 82 is deformable and deforms more greatly than the diaphragm 81 when the same force is applied. Then, the other main surface (main surface on the ⁇ z direction side in the drawing) of the piezoelectric actuator 1 is fixed to the one main surface (main surface on the + z direction side in the drawing) of the bonding member 82 as a whole. A part of one main surface (main surface on the + z direction side in the drawing) of the diaphragm 81 is fixed to the other main surface (main surface on the ⁇ z direction side in the drawing).
- the joining member 82 may be a single member or a composite composed of several members.
- a joining member 82 for example, a double-sided tape in which a pressure-sensitive adhesive is attached to both surfaces of a substrate made of a nonwoven fabric or the like, various elastic adhesives which are adhesives having elasticity, and the like can be suitably used.
- the thickness of the joining member 82 is desirably larger than the amplitude of the flexural vibration of the piezoelectric actuator 1, but if it is too thick, the vibration is attenuated, so it is set to 0.1 mm to 0.6 mm, for example.
- the material of the bonding member 82 is not limited, and the bonding member 82 may be formed of a material that is harder and less deformable than the vibration plate 81. In some cases, a configuration without the joining member 82 may be used.
- the piezoelectric vibration device of this example having such a configuration functions as a piezoelectric vibration device that causes the piezoelectric actuator 1 to bend and vibrate by applying an electric signal, thereby vibrating the vibration plate 81.
- the other end in the length direction of the diaphragm 81 (the end in the ⁇ y direction in the figure, the peripheral edge of the diaphragm 81, and the like) may be supported by a support member (not shown).
- the piezoelectric vibration device of this example is configured using the piezoelectric actuator 1 in which generation of unnecessary vibration is reduced, the piezoelectric vibration device in which generation of unnecessary vibration is reduced can be obtained.
- the vibration plate 81 is joined to the other flat main surface of the piezoelectric actuator 1. Thereby, a piezoelectric vibration device in which the piezoelectric actuator 1 and the vibration plate 81 are firmly joined can be obtained.
- the portable terminal of the present invention includes the piezoelectric actuator 1, an electronic circuit (not shown), a display 91, and a housing 92, and the other side of the piezoelectric actuator 1.
- the main surface is joined to the housing 92.
- 4 is a schematic perspective view schematically showing the portable terminal of the present invention
- FIG. 5 is a schematic cross-sectional view taken along line AA shown in FIG. 4
- FIG. 6 is a line BB shown in FIG. It is the schematic sectional drawing cut
- the piezoelectric actuator 1 and the housing 92 are joined using a deformable joining member. That is, in FIG. 5 and FIG. 6, the joining member 82 is a deformable joining member.
- the deformable joining member 82 By joining the piezoelectric actuator 1 and the housing 92 with the deformable joining member 82, when the vibration is transmitted from the piezoelectric actuator 1, the deformable joining member 82 is deformed more greatly than the housing 92.
- the piezoelectric actuator 1 transmits strong vibration to the casing 92 without being influenced by the surrounding vibration. Can be made.
- the joining member 82 since at least a part of the joining member 82 is formed of a viscoelastic body, strong vibration from the piezoelectric actuator 1 is transmitted to the housing 92, while weak vibration reflected from the housing 92 is transmitted to the joining member 82. It is preferable in that it can be absorbed.
- a double-sided tape in which a pressure-sensitive adhesive is attached to both surfaces of a base material made of a nonwoven fabric or the like, or a joining member including an adhesive having elasticity can be used. Can be used.
- the piezoelectric actuator 1 is attached to a part of the casing 92 that becomes the cover of the display 91, and a part of the casing 92 functions as the diaphragm 922.
- the piezoelectric actuator 1 is bonded to the housing 92, but the piezoelectric actuator 1 may be bonded to the display 91.
- the casing 92 includes a box-shaped casing main body 921 having one surface opened, and a diaphragm 922 that closes the opening of the casing main body 921.
- the casing 92 (the casing main body 921 and the diaphragm 922) can be preferably formed using a material such as a synthetic resin having high rigidity and elastic modulus.
- the peripheral edge of the diaphragm 922 is attached to the housing main body 921 via a bonding material 93 so as to vibrate.
- the bonding material 93 is formed of a material that is softer and easier to deform than the diaphragm 922, and has a smaller elastic modulus and rigidity such as Young's modulus, rigidity, and bulk modulus than the diaphragm 922. That is, the bonding material 93 can be deformed, and deforms more greatly than the diaphragm 922 when the same force is applied.
- the bonding material 93 may be a single material or a composite made up of several members.
- a bonding material 93 for example, a double-sided tape in which an adhesive is attached to both surfaces of a base material made of a nonwoven fabric or the like can be suitably used.
- the thickness of the bonding material 93 is set so that the vibration is not attenuated due to being too thick, and is set to, for example, 0.1 mm to 0.6 mm.
- the material of the bonding material 93 is not limited, and the bonding material 93 may be formed of a material that is harder and more difficult to deform than the diaphragm 922. In some cases, a configuration without the bonding material 93 may be used.
- Examples of the electronic circuit include a circuit that processes image information displayed on the display 91 and audio information transmitted by the mobile terminal, a communication circuit, and the like. At least one of these circuits may be included, or all the circuits may be included. Further, it may be a circuit having other functions. Furthermore, you may have a some electronic circuit.
- the electronic circuit and the piezoelectric actuator 1 are connected by a connection wiring (not shown).
- the display 91 is a display device having a function of displaying image information.
- a known display such as a liquid crystal display, a plasma display, and an organic EL display can be suitably used.
- the display 91 may have an input device such as a touch panel.
- the cover (diaphragm 922) of the display 91 may have an input device such as a touch panel.
- the entire display 91 or a part of the display 91 may function as a diaphragm.
- the portable terminal of the present invention is characterized in that the display 91 or the casing 92 generates vibration that transmits sound information through the ear cartilage or air conduction.
- the portable terminal of this example can transmit sound information by transmitting a vibration to the cartilage of the ear by bringing the diaphragm (display 91 or housing 92) into contact with the ear directly or via another object. That is, sound information can be transmitted by bringing a diaphragm (display 91 or housing 92) into direct or indirect contact with the ear and transmitting vibration to the cartilage of the ear.
- a portable terminal capable of transmitting sound information even when the surroundings are noisy can be obtained.
- the object interposed between the diaphragm (display 91 or housing 92) and the ear may be, for example, a cover of a mobile terminal, a headphone or an earphone, and any object that can transmit vibration. Anything can be used. Further, it may be a portable terminal that transmits sound information by propagating sound generated from the diaphragm (display 91 or housing 92) in the air. Furthermore, it may be a portable terminal that transmits sound information via a plurality of routes.
- the portable terminal of this example transmits sound information using the piezoelectric actuator 1 in which occurrence of unnecessary vibration is reduced, it can transmit high-quality sound information.
- the piezoelectric actuator shown in FIG. 1 was manufactured as follows.
- the piezoelectric element had a rectangular parallelepiped shape with a length of 23.5 mm, a width of 3.3 mm, and a thickness of 0.5 mm.
- the piezoelectric element has a structure in which piezoelectric layers having a thickness of 30 ⁇ m and internal electrodes are alternately stacked, and the total number of piezoelectric layers is 16.
- the piezoelectric layer was formed of lead zirconate titanate.
- As the internal electrode an alloy of silver palladium was used.
- a ceramic green sheet printed with a conductive paste made of silver palladium is laminated, and then a dent is formed as a mold on the upper side (one side in contact with the main surface) of the press device.
- a molded body was produced.
- the surface electrode was printed so as to be 1 mm longer at both ends than the internal electrode.
- the active part protruded 50 ⁇ m from the inactive part on one main surface.
- the other main surface was almost flat.
- a voltage with an electric field strength of 2 kV / mm was applied between the internal electrodes (between the first electrode and the second electrode) via the surface electrode to polarize the piezoelectric element.
- the piezoelectric actuator (sample No. 1) of the embodiment of the present invention was fabricated by being electrically connected and fixed to the piezoelectric element.
- sample No. 2 As a comparative example, the sample No. described above was used except that one main surface and the other main surface were flat.
- a sine wave signal having an effective value of ⁇ 10 Vrms was applied to the piezoelectric element at a frequency of 1 kHz via a flexible substrate, and a drive test was performed. For both 1 and 2, bending vibration having a displacement of 100 ⁇ m was obtained.
- sample No. The piezoelectric actuator 1 continued to drive without abnormal vibration even after 100,000 cycles. Also, no cracks or cracks were found in the conductive adhesive connecting and fixing the flexible substrate, and no peeling of the flexible substrate was seen.
- Piezoelectric actuator 2 Internal electrode 21: First pole 22: Second pole 3: Piezoelectric layer 4: Laminate 41: Active part 42: Inactive part 5: Surface electrode 51: First surface electrode 52: Second surface electrode 53: Third surface electrode 6: Flexible substrate 61: Wiring conductor 7: Anisotropic conductive material 81: Diaphragm 82: Joining member 91: Display 92: Housing 921: Housing body 922: Diaphragm 93: Bonding material
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Telephone Set Structure (AREA)
Abstract
Description
2:内部電極
21:第1の極
22:第2の極
3:圧電体層
4:積層体
41:活性部
42:不活性部
5:表面電極
51:第1の表面電極
52:第2の表面電極
53:第3の表面電極
6:フレキシブル基板
61:配線導体
7:異方性導電材
81:振動板
82:接合部材
91:ディスプレイ
92:筐体
921:筐体本体
922:振動板
93:接合材
Claims (10)
- 内部電極および圧電体層が積層された積層体と、該積層体の一方主面に前記内部電極と電気的に接続された表面電極を備えた圧電素子と、
前記一方主面に導電性接合部材を介して一部が接合され、前記表面電極と電気的に接続された配線導体を備えたフレキシブル基板とを有しており、
前記一方主面の少なくとも前記フレキシブル基板が接合された領域は他方主面よりも平坦度が悪くなっていることを特徴とする圧電アクチュエータ。 - 前記内部電極は第1の極と第2の極とを含み、前記第1の極および前記第2の極が積層方向に重なる相対的に厚みの厚い活性部と該活性部以外の相対的に厚みの薄い不活性部との間で前記一方主面に段差が設けられており、前記フレキシブル基板は前記一方主面の前記活性部から前記不活性部にかけて接合されていることを特徴とする請求項1に記載の圧電アクチュエータ。
- 前記圧電素子は長手方向と幅方向とを有する長尺状体であって、前記内部電極は第1の極と第2の極とを含み、前記内部電極の前記第1の極および前記第2の極が積層方向に重なる相対的に厚みの厚い前記幅方向の中央領域と該中央領域以外の相対的に厚みの薄い前記幅方向の端部領域との間で前記一方主面に段差が設けられており、前記フレキシブル基板は前記一方主面の前記幅方向の中央領域から前記幅方向の端部領域にかけて接合されていることを特徴とする請求項1に記載の圧電アクチュエータ。
- 前記他方主面は平坦であることを特徴とする請求項1乃至請求項3のうちのいずれかに記載の圧電アクチュエータ。
- 前記導電性接合部材が異方性導電材であることを特徴とする請求項1乃至請求項4のうちのいずれかに記載の圧電アクチュエータ。
- 請求項1乃至請求項5のうちのいずれかに記載の圧電アクチュエータと、前記圧電素子の前記他方主面に接合された振動板とを有することを特徴とする圧電振動装置。
- 前記圧電アクチュエータと前記振動板とが変形可能な接合部材を用いて接合されていることを特徴とする請求項6に記載の圧電振動装置。
- 請求項1乃至請求項5のうちのいずれかに記載の圧電アクチュエータと、電子回路と、ディスプレイと、筐体とを有しており、
前記圧電アクチュエータの他方主面が前記ディスプレイまたは前記筐体に接合されていることを特徴とする携帯端末。 - 前記圧電アクチュエータと前記ディスプレイまたは前記筐体とが変形可能な接合部材を用いて接合されていることを特徴とする請求項8に記載の携帯端末。
- 前記ディスプレイまたは前記筐体は、耳の軟骨または気導を通して音情報を伝える振動を生じさせることを特徴とする請求項8または請求項9に記載の携帯端末。
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JP2013516890A JP5474261B1 (ja) | 2012-05-12 | 2012-08-31 | 圧電アクチュエータ、圧電振動装置および携帯端末 |
US13/985,620 US8952598B2 (en) | 2012-05-12 | 2012-08-31 | Piezoelectric actuator, piezoelectric vibration apparatus and portable terminal having a region that is not flat for bonding to a flexible substrate |
CN201280011721.1A CN103534827B (zh) | 2012-05-12 | 2012-08-31 | 压电促动器、压电振动装置及便携终端 |
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US8952598B2 (en) | 2015-02-10 |
KR101603957B1 (ko) | 2016-03-16 |
TW201347251A (zh) | 2013-11-16 |
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