WO2011007646A1 - 金属板と圧電体との接着構造及び接着方法 - Google Patents
金属板と圧電体との接着構造及び接着方法 Download PDFInfo
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- WO2011007646A1 WO2011007646A1 PCT/JP2010/060516 JP2010060516W WO2011007646A1 WO 2011007646 A1 WO2011007646 A1 WO 2011007646A1 JP 2010060516 W JP2010060516 W JP 2010060516W WO 2011007646 A1 WO2011007646 A1 WO 2011007646A1
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- metal plate
- piezoelectric body
- carbon black
- conductive adhesive
- electrode
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- 239000002184 metal Substances 0.000 title claims abstract description 73
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/047—Pumps having electric drive
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
-
- 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
-
- 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
- H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
-
- 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
- H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
- H10N30/072—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by laminating or bonding of piezoelectric or electrostrictive bodies
- H10N30/073—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by laminating or bonding of piezoelectric or electrostrictive bodies by fusion of metals or by adhesives
-
- 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
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/877—Conductive materials
- H10N30/878—Conductive materials the principal material being non-metallic, e.g. oxide or carbon based
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
- H01G9/0032—Processes of manufacture formation of the dielectric layer
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49005—Acoustic transducer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49126—Assembling bases
Definitions
- the present invention relates to a bonding structure and bonding method between a metal plate and a piezoelectric body, such as a piezoelectric diaphragm used for a piezoelectric micro blower driving body.
- Piezoelectric micro blowers are known as blower blowers for effectively releasing the heat generated inside the casing of portable electronic devices, or as blower blowers for supplying oxygen necessary for power generation by a fuel cell. (See Patent Document 1).
- a piezoelectric micro blower is a kind of pump that uses a diaphragm that bends and vibrates when a voltage is applied, and has an advantage that it has a simple structure, can be made small and thin, and has low power consumption.
- FIG. 1 shows an example of a diaphragm used for a piezoelectric microblower.
- a piezoelectric body (piezoelectric ceramic plate) 2 having electrodes 3 and 4 on the front and back surfaces is bonded onto a metal diaphragm 1.
- One electrode 3 and the diaphragm 1 are electrically connected.
- the entire diaphragm can bend and vibrate and air can be sent out.
- the diaphragm is not limited to the one in which the piezoelectric body 2 is directly bonded on the diaphragm 1, but another metal plate is bonded on the diaphragm 1 and the piezoelectric body 2 is bonded on the diaphragm 1, or the diaphragm. There are various forms such as one in which the piezoelectric body 2 is bonded to both the front and back surfaces of 1.
- FIGS. 2A to 2C show examples of the adhesion structure between the electrode 3 of the piezoelectric body 2 and the metal plate 1 (diaphragm).
- FIG. 2A is an example in which an adhesive 5 having no conductive auxiliary agent is used.
- the adhesive thickness between the piezoelectric body 2 and the metal plate 1 is thinned to the limit, and the electrode 3 and the metal plate 1 are bonded to each other. Conduction is achieved by contact (ohmic contact).
- FIG. 2B shows a case where carbon spheres 6 are added to the adhesive 5 as a conductive auxiliary agent to obtain conductivity through the carbon spheres 6.
- the diameter of the carbon sphere 6 is, for example, about 20 ⁇ m, and the electrode 3 and the metal plate 1 are not directly connected.
- carbon black 7 having an average particle size of several tens of nanometers is added to the adhesive 5 as a conductive auxiliary agent, and in addition to the conductivity due to the contact between the electrode 3 of the piezoelectric body 2 and the metal plate 1. Conductivity is obtained through the carbon black 7.
- the resistance value increases when the adhesive swells in the moisture test after adhesion (the conductivity is increased).
- the adhesive 5 to which the carbon sphere 6 is added as shown in FIG. 2B is used, cracks starting from the carbon sphere 6 are likely to occur in the piezoelectric body 2 and the adhesive becomes thicker.
- the vibration characteristics of 2 are deteriorated.
- the contact with the electrode is a point contact, or the largest particle becomes a spacer and the small particle size does not contribute to conduction, there is a problem that the resistance value becomes high.
- carbon black 7 having a small particle size is used as shown in FIG.
- the content of carbon black 7 has a large effect on the viscosity and thixotropy of the adhesive, and the workability and coating properties are adversely affected. There is a problem of affecting. Furthermore, there is also a problem that when the adhesive swells in the moisture test after bonding, the resistance value increases (conductivity decreases).
- Patent Document 2 discloses a conductive adhesive used for bonding between an active material layer and a current collector in an energy storage element.
- This adhesive is a paste-like conductive adhesive containing carbon powder (for example, carbon black) as a conductive material, a resin as a binder, and water as a solvent.
- the weight average particle diameter is in the range of 5 nm to 100 nm
- the amount of carbon powder is in the range of 5 to 50% by weight with respect to the total amount of carbon powder and resin
- the water content of the paste-like conductive adhesive is 70 to The range is 95% by weight.
- FIG. 2 (d) shows an example of an adhesive structure using the conductive adhesive shown in Patent Document 2.
- carbon black 7 is added to the adhesive 5 as a conductive auxiliary agent.
- the electrode 3 and the metal plate 1 are not directly connected to each other. It has gained. Since a larger amount of carbon black 7 is added than in FIG. 2C, the conductivity is considered to be improved from that in FIG.
- An object of the present invention is to provide an adhesion structure and an adhesion method between a piezoelectric body and a metal plate excellent in conductivity and adhesion.
- the first invention includes a metal plate, a piezoelectric body having an electrode on a surface facing the metal plate, carbon black as a conductive auxiliary agent, and the metal plate and the electrode of the piezoelectric body.
- an electrically conductive adhesive bonded with electrical conductivity, the electrically conductive adhesive before curing contains carbon black having an average particle size of nano level, and the carbon black has an average particle size
- the paste-like conductive adhesive is applied between the metal plate and the piezoelectric electrode so as to form an aggregate of 1 ⁇ m to 50 ⁇ m in a solvent-free or solvent-based resin.
- an adhesive structure is provided in which the conductive adhesive is cured in a state where the aggregate of the carbon black is deformed by heating and pressurizing the metal plate and the piezoelectric body.
- a metal plate and a piezoelectric body having an electrode on a surface facing the metal plate are used, and a conductive adhesive containing carbon black is used as a conductive auxiliary agent.
- a solvent-free or solvent-based system is used so that the carbon black contains nano black having an average particle diameter and becomes an aggregate having an average particle diameter of 1 ⁇ m to 50 ⁇ m.
- the conductive adhesive of the present invention is in the form of a paste containing carbon black having an average particle size of nano-level and contained in the resin so that the carbon black becomes an aggregate having an average particle size of 1 ⁇ m to 50 ⁇ m.
- Aggregates are those in which the primary particles of carbon black are bonded together by intermolecular force or the like to form a lump having an average particle size of 1 ⁇ m or more. Therefore, compared with the case where the same amount of carbon black is contained in the resin in a dispersed state, the influence on the viscosity and thixotropy of the adhesive can be reduced, and workability and coating properties are improved.
- the aggregate itself is not rigid, and when the metal plate and the piezoelectric body are heated and pressurized, the aggregate deforms so as to follow the unevenness thereof, so there is little damage to the piezoelectric body and the thickness of the adhesive There is no influence on the increase, and conductivity can be imparted.
- Conductivity between the metal plate and the piezoelectric body can be obtained not only by conduction through carbon black but also by direct contact between the metal plate and the electrode of the piezoelectric body, so that high conductivity (low resistance value) is obtained. be able to.
- the average particle diameter is obtained, for example, by taking an SEM image of a granule, binarizing the obtained image to obtain the area of the granule, and obtaining the area when the area is converted into a circle. it can. Both primary particles and secondary particles can be captured by SEM images.
- the lower limit size is preferably 1 ⁇ m.
- the upper limit size exceeds 50 ⁇ m, the size of the aggregate is less than that of the metal plate and electrode. Since it becomes larger than the unevenness of the surface, the thickness of the adhesive is increased. Therefore, the upper limit size is preferably 50 ⁇ m.
- the carbon black is not dispersed but hardened as an aggregate, so that the metal plate and the electrode of the piezoelectric body are electrically connected over the entire surface like a conductive adhesive using conventional carbon black.
- it is possible to conduct in an island-like dispersed state (anisotropic conductivity). That is, it has conductivity in the opposing direction of the metal plate and the electrode, but there is no conductivity in the planar direction. Due to such an anisotropic conductive structure, the contact probability between carbon blacks is dramatically improved and high conductivity (low resistance value) is obtained as compared with the case where the same amount of carbon black is contained in a dispersed state. be able to.
- a fillet of conductive adhesive is formed around the piezoelectric body, but a short circuit occurs when a part of the fillet reaches the upper surface side electrode of the piezoelectric body. There is a risk. Since the conductive adhesive concerning this invention can have anisotropic conductivity, such a short circuit can be prevented reliably.
- the conductive adhesive according to the present invention may be either a solventless type or a solvent type, but at least a conductive adhesive using an aqueous solvent is excluded.
- the solventless system is a conductive adhesive in which carbon black is added to a liquid resin
- the solvent system is a conductive adhesive in which a polymer is dissolved in an organic solvent and carbon black is added therein.
- An example of the solventless resin is an epoxy resin
- an example of the solvent resin is an acrylic resin.
- the adhesive does not become porous in the cured state, and when viewed with long-term reliability, the adhesive is less likely to swell due to water absorption, and there is no problem that the conductivity decreases.
- the average particle size of carbon black contained in the conductive adhesive is nano-level, for example, carbon black of 5 nm to 300 nm.
- the carbon black primary particles are added to the resin so as to form aggregates having an average particle diameter of 1 ⁇ m to 50 ⁇ m in the resin. Therefore, it is desirable to perform an appropriate dispersion / kneading treatment so that the carbon black becomes an aggregate having a target particle size in the resin.
- the metal plate and the piezoelectric electrode it is desirable to pressurize the metal plate and the piezoelectric electrode so that the distance between them is smaller than the average particle size of the aggregate. That is, the distance between the metal plate and the piezoelectric body is made smaller than the average particle diameter of the aggregates in the conductive adhesive in the paste state. As a result, most of the aggregates are sandwiched between the metal plate and the electrodes of the piezoelectric body, and reliable electrical conductivity can be obtained.
- the resin contained in the conductive adhesive is preferably a resin having a dense structure in a cured state, high weather resistance and heat resistance, and hardly swells even in a moisture test after adhesion.
- a resin having a dense structure in a cured state high weather resistance and heat resistance, and hardly swells even in a moisture test after adhesion.
- the amount of carbon black in the conductive adhesive is desirably 1 to 10% by weight with respect to the total amount of carbon black and resin. Since the carbon black content is low, the viscosity and thixotropy of the adhesive are reduced, workability and coating properties are improved, and even if the carbon black content is low, the agglomerates are produced. Good conductivity can be obtained.
- a paste-like conductive adhesive in which carbon black is added to a solvent-free or solvent-based resin so as to form an aggregate having an average particle diameter of 1 ⁇ m to 50 ⁇ m is used. Since the conductive adhesive was cured by applying a conductive adhesive between the electrode and the piezoelectric body and heating and pressurizing the metal plate and the piezoelectric body, the agglomerates were the electrodes of the metal plate and the piezoelectric body. It can be deformed so as to follow the unevenness of the film, has little damage to the piezoelectric body, has no effect on the increase in the thickness of the adhesive, and can impart good conductivity.
- the absolute amount of the resin can be increased, the viscosity and thixotropy of the adhesive are lowered, and the workability and coating properties are improved. At the same time, a good adhesive force between the metal plate and the piezoelectric body can be obtained. Furthermore, since the resin does not contain water, the resin does not become porous in the cured state, and the adhesive is less likely to swell due to water absorption, and there is an advantage that long-term reliability is improved.
- FIG. 1 It is a structural diagram of an example of a piezoelectric diaphragm in which a piezoelectric material is bonded to a metal plate. It is an expanded sectional view showing the conventional adhesion structure. It is sectional drawing before heating and pressurization of the adhesion structure concerning the present invention, and after heating and pressurization.
- (A) is a figure which shows the relationship between aggregate size and adhesive viscosity
- (b) is a figure which shows the relationship between aggregate size and adhesion
- FIG. 6 is a structural diagram of another example of a piezoelectric vibration plate in which a piezoelectric body is bonded to a metal plate via an intermediate plate.
- FIG. 3 shows the bonding structure of the piezoelectric diaphragm according to the first embodiment of the present invention, where (a) is before heating / pressing, and (b) is after heating / pressing.
- a piezoelectric body 2 having electrodes 3 and 4 on both surfaces is bonded onto a metal plate 1 such as a diaphragm via a conductive adhesive 10.
- the conductive adhesive 10 is a paste in which a carbon black 12a having an average particle diameter of 5 nm to 300 nm (preferably 5 to 100 nm) is added to a solventless resin 11 such as an epoxy resin.
- the addition amount of the black 12a is 1 to 10% by weight with respect to the total amount of the carbon black 12a and the resin 11.
- the carbon black 12a does not exist as primary particles in the resin 11, but exists in a lump in the resin 11 so as to be mainly aggregates 12 having an average particle diameter of 1 ⁇ m to 50 ⁇ m.
- Aggregate 12 is a particle in which primary particles of carbon black 12a are bonded by intermolecular force and have a size of 1 ⁇ m or more.
- the aggregate 12 is in a suspended state in the resin 11 and is not in contact with the metal plate 1 or the electrode 3. Therefore, the metal plate 1 and the electrode 3 are not conductive. Since the content of the carbon black 12a contained in the conductive adhesive 10 is small and the amount of the resin 11 is large, the viscosity and thixotropy of the adhesive can be lowered, and workability and applicability are good.
- the aggregate 12 is deformed so as to follow the irregularities on the surfaces of the metal plate 1 and the electrode 3 as shown in FIG.
- the aggregate 12 is sandwiched between them. Therefore, the metal plate 1 and the electrode 3 are reliably connected.
- the carbon black 12a is not in a dispersed state but is cured as an aggregate 12
- the metal plate 1 and the electrode 3 of the piezoelectric body 2 are electrically connected to each other in an island shape (anisotropic conductivity). Due to such an anisotropic conductive structure, the contact probability between the carbon blacks 12a is greatly improved as compared with the case where the same amount of carbon black 12a is contained in a dispersed state, and high conductivity (low resistance) Value).
- the metal plate 1 and the electrode through the aggregate 12 are pressed by pressurizing the distance d between the metal plate 1 and the piezoelectric body 2 to be smaller than the average particle diameter of the aggregate 12. 3, the metal plate 1 and the electrodes 3 can be brought into direct contact with each other. Therefore, both electrical conductivity improves further.
- the distance d between the metal plate 1 and the electrode of the piezoelectric body 2 is the distance between the surface of the metal plate 1 and the electrode 3 of the piezoelectric body 2 when a predetermined length in the left-right direction in FIG. It can be obtained by a value obtained by dividing a region (area) surrounded by the surface by a predetermined length. That is, the distance between the position of the center line with respect to the cross-sectional curve on the surface of the metal plate and the position of the center line with respect to the cross-sectional curve on the surface of the piezoelectric electrode.
- FIG. 4 shows the relationship (a) between the size of the aggregate and the viscosity of the adhesive, and the relationship (b) between the size of the aggregate and the adhesive thickness.
- the carbon black content was 3.0% by weight.
- the particle size of the aggregate is preferably 1 ⁇ m or more.
- the adhesion thickness also increases. However, particularly when it exceeds 50 ⁇ m, the increase rate of the adhesion thickness increases, and the vibration of the piezoelectric body increases. The product characteristics deteriorate due to the fact that it is difficult to transmit to the metal plate. Therefore, the average particle size of the aggregate is desirably 1 to 50 ⁇ m.
- FIG. 5 is a diagram for evaluating the conductivity when the two metal plates 20 and 21 are bonded using the conductive adhesive 22.
- an adhesive thickness variation was assumed, and an insulating spacer 23 having a diameter of 3 ⁇ m was bonded so as to have a thickness of 3 ⁇ m, and the conductive adhesive 22 was adhered, and the series resistance between the metal plates 20 and 21 was measured.
- the evaluation results are shown in Table 1.
- the component ratio in the adhesive was 3% by weight of carbon black and 97% by weight of epoxy resin.
- the average particle size of carbon black (primary particles) was 50 nm, the average particle size of aggregates was 5 ⁇ m, and the particle size of spherical carbon was 3 ⁇ m.
- 6 (a) and 6 (b) are graphs comparing the properties of viscosity, thixotropy, and series resistance when adding dispersed carbon black and when adding aggregated carbon black.
- (A) is a figure which shows the relationship between the addition amount of carbon black, a viscosity, and thixotropy, and the change of the viscosity and thixotropy with respect to carbon addition amount is small compared with dispersion
- the agglomerated carbon black has lower viscosity and thixotropy, so good application stability (application amount variation, leveling after application) can be obtained in the adhesive application process. It is done.
- the addition amount of carbon black and the series resistance are inversely proportional to each other.
- the aggregated carbon black has a smaller addition amount and a desired resistance value. Can be obtained. That is, when trying to obtain the same viscosity and resistance value, the amount of the aggregated carbon black can be reduced. Therefore, cost can be reduced.
- the bonding structure according to the present invention is not limited to the structure in which the piezoelectric body 2 is directly attached on the diaphragm 1 as shown in FIG. 1, but the metal intermediate plate 8 on the diaphragm 1 as shown in FIG. 7. May be applied, and the piezoelectric body 2 may be attached thereon.
- the conductive adhesive 10 according to the present invention is interposed between the diaphragm 1 and the intermediate plate 9 and between the intermediate plate 9 and the piezoelectric body 2. Since the conductive adhesive 10 has high conductivity and excellent adhesive strength, it is possible to ensure good conductivity and adhesion between the electrode 3, the intermediate plate 9, and the diaphragm 1 of the piezoelectric body 2.
- the shape of the metal plate and the piezoelectric body is arbitrary, and may be a disc shape, a square plate shape, or an annular shape.
- the piezoelectric diaphragm according to the present invention includes a piezoelectric micro blower that transports a compressible fluid such as air, a piezoelectric micro pump that transports an incompressible fluid such as water, a piezoelectric speaker, a piezoelectric buzzer, and a piezoelectric. It can also be used for sensors.
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Abstract
Description
(a)カーボンブラック凝集体が柔軟に変形するため、接着剤の厚み増加への影響が少ない。
(b)加圧接着時にカーボンブラック凝集体が柔軟に変形するため、圧電体へのダメージが少ない。
(c)カーボンブラックが凝集体(塊状)で存在するため、カーボンブラック同士の接触確率が飛躍的に向上し、同量のカーボンブラックが非凝集(一次粒子)の状態で存在する場合に比べて、高い導電効果(異方導電性)を得ることができる。
(d)接着状態において導電性接着剤が異方導電性を有するので、圧電体の周囲に形成されたフィレットの一部が表面側の電極まで回りこんでも、短絡を防止することができる。
(e)湿中試験での接着剤膨潤に対して、カーボンブラック凝集体の柔軟な変形によって対応できるので、導通信頼性が向上する。
(f)カーボンブラックの一次粒子が樹脂中へ分散している状態と比較して、樹脂流動性が高く、大幅に粘度・チクソ性への影響を抑えることができる。
2 圧電体
3,4 電極
10 導電性接着剤
11 無溶剤系樹脂
12 凝集体
12a カーボンブラック
Claims (6)
- 金属板と、前記金属板と対向する面に電極を有する圧電体と、導電補助剤としてカーボンブラックを含み、前記金属板と圧電体の電極とを電気的導通性をもって接着した導電性接着剤と、を有する接着構造において、
硬化前の前記導電性接着剤は、平均粒径がナノレベルのカーボンブラックを含み、かつ当該カーボンブラックが平均粒径1μm~50μmの凝集体となるように、無溶剤系又は溶剤系樹脂中に含有されたペースト状であり、
前記金属板と圧電体の電極との間に前記ペースト状の導電性接着剤を塗布し、前記金属板と圧電体とを加熱・加圧することにより、前記カーボンブラックの凝集体を変形させた状態で前記導電性接着剤を硬化させてなることを特徴とする接着構造。 - 前記金属板と圧電体の電極との間の距離が、前記凝集体の平均粒径より小さくなるように、前記金属板と圧電体とが加圧されていることを特徴とする、請求項1に記載の接着構造。
- 硬化状態における前記導電性接着剤は異方導電性を有することを特徴とする、請求項1又は2に記載の接着構造。
- 前記導電性接着剤中のカーボンブラックの量は、カーボンブラックと樹脂との合計量に対して1~10重量%であることを特徴とする、請求項1乃至3のいずれか1項に記載の接着構造。
- 金属板と、前記金属板と対向する面に電極を有する圧電体とを、導電補助剤としてカーボンブラックを含む導電性接着剤を用いて、前記金属板と圧電体の電極との電気的導通性をもって接着する接着方法において、
平均粒径がナノレベルのカーボンブラックを含み、かつ当該カーボンブラックが平均粒径1μm~50μmの凝集体となるように、無溶剤系又は溶剤系樹脂中に含有されたペースト状の前記導電性接着剤を、前記金属板と圧電体の電極との間に塗布する工程と、
前記導電性接着剤を塗布した後、前記金属板と圧電体とを加熱・加圧することにより、前記カーボンブラックの凝集体を変形させた状態で前記導電性接着剤を硬化させる工程と、を含む接着方法。 - 前記金属板と圧電体の電極との間の距離が、前記凝集体の平均粒径より小さくなるように、前記金属板と圧電体とを加圧することを特徴とする、請求項5に記載の接着方法。
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JP2011514572A JP4771028B2 (ja) | 2009-07-17 | 2010-06-22 | 金属板と圧電体との接着構造及び接着方法 |
US13/337,331 US8492959B2 (en) | 2009-07-17 | 2011-12-27 | Structure for bonding metal plate and piezoelectric body and bonding method |
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