WO2015167014A1 - Élément de détection d'impacts - Google Patents

Élément de détection d'impacts Download PDF

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Publication number
WO2015167014A1
WO2015167014A1 PCT/JP2015/063094 JP2015063094W WO2015167014A1 WO 2015167014 A1 WO2015167014 A1 WO 2015167014A1 JP 2015063094 W JP2015063094 W JP 2015063094W WO 2015167014 A1 WO2015167014 A1 WO 2015167014A1
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WO
WIPO (PCT)
Prior art keywords
sound wave
resin body
porous resin
fiber
detecting element
Prior art date
Application number
PCT/JP2015/063094
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English (en)
Japanese (ja)
Inventor
米田　哲也
幸 山中
学 本居
佳郎 田實
Original Assignee
日本バルカー工業株式会社
学校法人関西大学
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
Application filed by 日本バルカー工業株式会社, 学校法人関西大学 filed Critical 日本バルカー工業株式会社
Priority to JP2016516425A priority Critical patent/JPWO2015167014A1/ja
Publication of WO2015167014A1 publication Critical patent/WO2015167014A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones
    • 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
    • H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
    • 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
    • H10N30/85—Piezoelectric or electrostrictive active materials
    • H10N30/857—Macromolecular compositions

Definitions

  • the present invention relates to a sound wave detection element.
  • Patent Document 1 discloses an ultrasonic transducer in which a piezoelectric element is incorporated in a case
  • Patent Document 2 discloses a piezoelectric element bonded to the case.
  • An ultrasonic transducer having a body is disclosed.
  • the sound wave detection elements described in the above-mentioned patent documents have problems in terms of durability such as long-term characteristic maintenance and heat resistance, and there is room for further improvement.
  • This invention is made
  • the present inventors have intensively studied to solve the above problems, and as a result, have a porous resin body made of a resin that does not have a dipole attributed to a molecule and a crystal structure, and a pressure vessel. According to the sound wave detection element, the inventors have found that the above object can be achieved, and have completed the present invention.
  • the configuration of the present invention is as follows.
  • the acoustic wave detecting element of the present invention includes a porous resin body made of a resin that does not have a dipole attributed to a molecule and a crystal structure, and a pressure vessel. For this reason, the sound wave detection element of this invention is excellent in sound wave detection ability and durability.
  • the sound wave detection element of the present invention can be used in various fields such as inspection of defects in structures, diagnosis of human and animal diseases, sounding instruments or detectors, and is particularly high in an environment where the temperature is higher than room temperature. It can be suitably used for applications where it is desired to detect sound waves in an environment where pressure is applied (eg, an environment where the pressure is 1 MPa or more).
  • the sound wave detecting element of the present invention is suitably used as an ultrasonic wave detecting element.
  • the structure of the sound wave detection element of the present invention is not particularly limited as long as it has the porous resin body and the pressure resistant container, but is preferably an element in which the porous resin body is accommodated in the pressure resistant container.
  • a conventionally known layer other than the porous resin body and the pressure vessel there may be a conventionally known layer other than the porous resin body and the pressure vessel, and this layer may be present inside the pressure vessel or outside. May be present.
  • Examples of such conventionally known layers include an adhesive layer for bonding the porous resin body and the pressure resistant container, an electrode layer, and an insulating layer.
  • the conventionally known layer is preferably a layer that covers at least a part of the surface of the porous resin body from the viewpoint of obtaining a sound wave detecting element including a porous resin body that maintains a high piezoelectricity.
  • a porous resin body made of a resin that does not have a dipole due to a molecule and a crystal structure is used as a piezoelectric material, and plays a role of detecting sound waves by converting sound waves into electric power.
  • the porous resin body has high charge responsiveness to minute external forces, high sound wave detection ability, and can retain electric charge even in a high temperature environment. It is possible to obtain a sound wave detecting element that is highly flexible, excellent in impact resistance and heat resistance, and lightweight. Furthermore, since the porous resin body can be easily formed into an arbitrary shape such as a thin film or a large area, a sound wave detecting element having an arbitrary shape can be manufactured according to a desired application.
  • the porous resin body is preferably a structure made of a resin capable of holding electric charge, and more preferably a structure made of a resin having heat resistance.
  • the resin having no dipole due to the molecule and crystal structure is not particularly limited as long as the molecule and crystal structure are not polar resins, but polyolefin resin (polyethylene, polypropylene, ethylene propylene resin, etc.), polyester resin Non-fluorinated resins such as resins (polyethylene terephthalate, etc.), polyurethane resins, polystyrene resins, silicone resins, etc., and polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers (PFA), tetrafluoro Examples thereof include fluorine resins such as ethylene-hexafluoropropylene copolymer (FEP).
  • FEP ethylene-hexafluoropropylene copolymer
  • a resin that has a high continuously usable temperature and does not have a glass transition point in the operating temperature range of the acoustic wave detection element is preferable.
  • the continuous useable temperature can be measured by a continuous use temperature test described in UL746B (UL standard), preferably 50 ° C or higher, more preferably 100 ° C or higher, and further preferably 200 ° C or higher.
  • UL746B UL standard
  • a resin exhibiting water repellency is preferable.
  • the resin having these characteristics for example, polyolefin resin and fluorine resin are preferable, fluorine resin is more preferable, and PTFE is particularly preferable.
  • the porous resin body may contain a conventionally known additive in addition to the resin as long as the effects of the present invention are not impaired.
  • a conventionally known additive in addition to the resin as long as the effects of the present invention are not impaired.
  • matrix resin and charge-induced hollow particles particles in which a conductive substance is attached to at least a part of the surface of the hollow particles
  • the structure containing these may be sufficient.
  • the initial value of piezoelectricity d 33 of the porous resin body is preferably 110 pC / N or more, more preferably about 115 to 400 pC / N.
  • the piezoelectric constant d 33 after 5 days is preferably 60 pC / N or more, more preferably 70 pC / N or more, and the piezoelectric constant d 33 after 25 days is preferably 50 pC / N or more.
  • a porous resin body having a piezoelectric rate in the above range can be suitably used as a piezoelectric material.
  • the piezoelectricity is constant AC acceleration ⁇ (frequency: 90 to 300 Hz, size: 2 to 10 m / s 2 ) in the thickness direction of the porous resin body under conditions of room temperature (20 ° C.) and humidity of 20%. ) And measuring the response charge at that time.
  • the porous resin body has a porosity calculated by the following formula of preferably 60% or more, more preferably 80 to 99%.
  • a porous resin body having a porosity in the above range is preferable because of its high charge retention amount.
  • Porosity (true resin density ⁇ apparent density) ⁇ 100 / true resin density
  • apparent density a value calculated using the weight of the porous resin body and the apparent volume is used.
  • the shape of the porous resin body may be appropriately selected according to the application to be used, but is preferably a sheet from the viewpoint of ease of production, sound wave detectability, and the like.
  • the thickness is not particularly limited, but is, for example, 10 ⁇ m to 1 mm, and preferably 50 ⁇ m to 500 ⁇ m.
  • the porous resin body can be obtained by various conventionally known methods. For example, a method of forming pores using the phase change of the solution containing the resin (phase separation method), a method of mixing and dispersing additives for pore formation in the resin and removing them after molding (extraction) Method), molding the resin, and then chemically cutting the bond of a part of the molded body, or conversely performing a binding reaction (chemical treatment method), stretching the resin, A method of forming micropores in the microfibril structure part, a method of mixing and dispersing additives and forming pores during stretching (stretching method), and a method of forming pores by irradiating neutron beams, lasers, etc.
  • phase separation method phase separation method
  • a method of mixing and dispersing additives for pore formation in the resin and removing them after molding (extraction) Method molding the resin, and then chemically cutting the bond of a part of the molded body, or conversely performing a binding reaction (chemical treatment method), stretching the resin
  • Irradiation etching method a method of forming a porous body by fusing resin fine pieces by heating or the like (fusion method), a method of forming pores using a foaming agent (foaming method), Method to form pores by combining (composite method), dry spinning, wet spinning, dry Wherein spinning, melt spinning, to form a fiber (fiber) from the resin by electrospinning like, a method of forming a woven or nonwoven fabric using the fiber and the like.
  • the porous resin body is preferably a structure including a nonwoven fabric or a woven fabric formed from fibers made of resin from the viewpoint of durability and long-term deformation performance can be maintained.
  • the structure may include the non-woven fabric or woven fabric, or may be a structure made of only the non-woven fabric or woven fabric, or a laminate in which a conventionally known layer is laminated on the surface of the non-woven fabric or woven fabric. Also good.
  • the average fiber diameter of the fiber is preferably 0.05 to 50 ⁇ m, more preferably 0.1 to 20 ⁇ m, and further preferably 0.5 ⁇ m to 5 ⁇ m.
  • a porous resin body containing fibers having an average fiber diameter within the above range can form a sufficient space to retain electric charge by increasing the fiber surface area, and increase the fiber distribution uniformity even when it is made into a thin film. It is preferable in that it can be produced.
  • the average fiber diameter can be adjusted by appropriately selecting the conditions for forming the fiber.For example, when the fiber is formed by electrospinning, the humidity is reduced during electrospinning, and the nozzle diameter is adjusted. There is a tendency that the average fiber diameter of the obtained fiber can be reduced by decreasing the voltage, increasing the applied voltage, or increasing the voltage density.
  • the average fiber diameter was determined by observing the fiber (group) to be measured with a scanning electron microscope (SEM) (magnification: 10000 times), and randomly selecting 20 fibers from the obtained SEM image. The fiber diameter (major diameter) of each fiber is measured, and is an average value calculated based on the measurement result.
  • SEM scanning electron microscope
  • the fiber diameter variation coefficient of the fiber calculated by the following formula is preferably 0.7 or less, more preferably 0.01 to 0.5.
  • the fiber diameter variation coefficient is within the above range, the fiber has a uniform fiber diameter, and the nonwoven fabric obtained using the fiber has a higher porosity. Since it is obtained, it is preferable.
  • Fiber diameter variation coefficient standard deviation / average fiber diameter (“standard deviation” is the standard deviation of the fiber diameters of the 20 fibers)
  • the fiber length of the fiber is preferably 0.1 to 1000 mm, more preferably 0.5 to 100 mm, and still more preferably 1 to 50 mm.
  • the method for forming the fiber is not particularly limited, but the fiber obtained by the electrospinning method has a small fiber diameter, and the nonwoven fabric obtained by using the fiber has a high hollow ratio and a high specific surface area. From the viewpoint of obtaining a porous resin body having piezoelectric characteristics, the electrospinning method is preferable.
  • a porous resin body can be produced by accumulating the obtained fibers into a nonwoven fabric or weaving them into a woven fabric and molding them.
  • Electrospinning method When forming a fiber made of a resin using the electrospinning method, for example, a spinning solution containing the resin and, if necessary, a solvent is used.
  • the ratio of the resin contained in the spinning solution is, for example, 5 to 100% by weight, preferably 5 to 80% by weight, and more preferably 10 to 70% by weight.
  • the solvent is not particularly limited as long as it can dissolve or disperse the resin.
  • water dimethylacetamide, dimethylformamide, tetrahydrofuran, methylpyrrolidone, xylene, acetone, chloroform, ethylbenzene, cyclohexane, benzene, sulfolane.
  • solvents may be used alone or in combination of two or more.
  • the solvent is contained in the spinning solution in an amount of, for example, 0 to 90% by weight, preferably 10 to 90% by weight, more preferably 25 to 80% by weight.
  • the spinning solution may further contain additives such as a surfactant, a dispersant, a charge adjusting agent, a functional particle, an adhesive, a viscosity adjusting agent, and a fiber forming agent in addition to the resin and the solvent.
  • additives such as a surfactant, a dispersant, a charge adjusting agent, a functional particle, an adhesive, a viscosity adjusting agent, and a fiber forming agent in addition to the resin and the solvent.
  • the fiber forming agent is preferably a polymer having high solubility in a solvent, such as polyethylene oxide, polyethylene glycol, dextran, alginic acid, chitosan, starch, polyvinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, Examples thereof include cellulose and polyvinyl alcohol.
  • a solvent such as polyethylene oxide, polyethylene glycol, dextran, alginic acid, chitosan, starch, polyvinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, Examples thereof include cellulose and polyvinyl alcohol.
  • the amount of the fiber-forming agent used is, for example, 0.1 to 15% by weight, preferably 1 to 10% by weight in the spinning solution, although it depends on the viscosity of the solvent and the solubility of the resin in the solvent. .
  • the spinning solution can be produced by mixing the resin and, if necessary, a solvent and an additive by a conventionally known method.
  • spinning solution examples include the following spinning solution (1).
  • Spinning liquid (1) 30 to 70% by weight, preferably 35 to 60% by weight of PTFE, 0.1 to 10% by weight, preferably 1 to 7% by weight, and a total of 100% by weight Spinning solution containing solvent
  • the applied voltage at the time of electrospinning is preferably 1 to 100 kV, more preferably 5 to 50 kV, and still more preferably 10 to 40 kV.
  • the tip diameter (outer diameter) of the spinning nozzle used for electrospinning is preferably 0.1 to 2.0 mm, more preferably 0.2 to 1.6 mm.
  • the applied voltage is preferably 10 to 50 kV, more preferably 10 to 40 kV, and the tip diameter (outer diameter) of the spinning nozzle is used. ) Is preferably 0.3 to 1.6 mm.
  • a method for producing the fiber a method for producing a fiber made of PTFE by an electrospinning method will be specifically described.
  • a method for producing the PTFE fiber a conventionally known production method can be employed, and examples thereof include the following methods described in JP-T-2012-515850.
  • Providing a spinning solution comprising PTFE, a fiber forming agent and a solvent and having a viscosity of at least 50,000 cP Spinning the spinning solution from a nozzle and forming a fiber by electrostatic traction; Collecting the fibers on a collector (eg, a take-up spool) to form a precursor; Firing the precursor to remove the solvent and the fiber former to form PTFE fibers.
  • the step of forming the fiber and the step of collecting the obtained fibers into a sheet to form the nonwoven fabric may be performed separately or simultaneously.
  • a nonwoven fabric may be formed by collecting fibers while collecting fibers).
  • a step of forming a fiber by using an electrospinning method and a step of collecting the obtained fibers into a sheet to form a nonwoven fabric may be simultaneously performed, or a step of forming a fiber. After performing, you may perform the process of accumulating the fiber obtained by the wet method in a sheet form, and forming a nonwoven fabric.
  • Examples of a method for forming a nonwoven fabric by the wet method include a method of forming (paper making) a sheet by depositing (accumulating) the fibers on a mesh using an aqueous dispersion containing the fibers. .
  • the amount of fiber used in this wet method is preferably 0.1 to 10% by weight, more preferably 0.1 to 5% by weight, based on the total amount of the aqueous dispersion. If the fiber is used within this range, water can be efficiently used in the process of depositing the fiber, and the dispersion state of the fiber is improved, so that a uniform wet nonwoven fabric can be obtained.
  • the aqueous dispersion is added with a dispersant or an oil agent composed of a cationic, anionic, or nonionic surfactant, or an antifoaming agent that suppresses the generation of bubbles. May be.
  • the woven fabric formed from the fiber can be manufactured by a method including a step of forming a fiber and a step of weaving the obtained fiber into a sheet to form a woven fabric.
  • a method of weaving the fiber into a sheet a conventionally known weaving method can be used, and methods such as a water jet room, an air jet room, and a rapier room can be used.
  • the basis weight of the nonwoven fabric and the woven fabric is preferably 100 g / m 2 or less, more preferably 0.1 to 50 g / m 2 , and still more preferably 0.1 to 20 g / m 2 .
  • the thickness of the nonwoven fabric and woven fabric is usually 10 ⁇ m to 1 mm, preferably 50 ⁇ m to 500 ⁇ m.
  • the basis weight and thickness tend to increase by increasing the spinning time or increasing the number of spinning nozzles.
  • the non-woven fabric and woven fabric are obtained by accumulating or weaving the fibers in a sheet shape.
  • Such non-woven fabric and woven fabric are composed of a single layer, or composed of two or more layers having different materials and fiber diameters. Any of these may be used.
  • the porous resin body is preferably subjected to polarization treatment from the viewpoint that a porous resin body having a piezoelectric constant d 33 in the above range can be obtained.
  • polarization treatment a conventionally known method can be used, and is not particularly limited, and examples thereof include voltage application processing such as DC voltage application processing and AC voltage application processing, and corona discharge processing.
  • the corona discharge treatment can be performed using a commercially available device composed of a high voltage power source and electrodes.
  • the discharge conditions may be appropriately selected according to the porous resin body to be used.
  • the voltage of the high-voltage power source is -0.1 to -100 kV, more preferably -1 to -20 kV, and the current is 0.1. 1 to 100 mA, more preferably 1 to 80 mA, the distance between the electrodes is 0.1 to 100 cm, more preferably 1 to 10 cm, and the applied voltage is 0.01 to 10.0 MV / m, more preferably 0.5 to 2.
  • a condition of 0 MV / m is mentioned.
  • the porous resin body alone may be usually polarized, but depending on the pressure vessel used, the polarization treatment may be performed after the porous resin body is accommodated in the vessel.
  • the pressure vessel is not particularly limited as long as it is a vessel that blocks external force other than sound waves applied to the porous resin body.
  • the external force refers to a force (excluding sound waves) applied to the element from the outside of the sound wave detecting element of the present invention, such as pressure or impact.
  • the sound wave transmittance of the pressure vessel is preferably 20% or more, more preferably 30% or more.
  • the sound wave transmittance is in the above range, even when the sound wave detecting element is an element in which the porous resin body is accommodated in the pressure resistant container, the sound wave is not easily absorbed by the pressure resistant container part, and the sound wave is generated by the porous resin body part. Since most of them can be detected, a high-performance acoustic wave detection element is preferable.
  • the sound transmittance can be measured according to JIS A 1405-1.
  • the tensile strength of the pressure vessel is not particularly limited, and is preferably such that the vessel can block external force (pressure) other than sound waves applied to the porous resin body, preferably 50 to 2000 MPa, more 200 to 2000 MPa is preferred.
  • external forces other than sound waves acting on the porous resin body can be effectively blocked, and external forces (noise) other than sound waves can be detected even in a high static pressure environment. It is possible to obtain a highly sensitive and highly durable sound wave detecting element.
  • the tensile strength can be measured in accordance with ISO 527-1 (JIS K 7161-7165).
  • the size and thickness of the pressure vessel are not particularly limited, and are preferably such size and thickness that the tensile strength falls within the above range, and may be appropriately selected according to the application in which the sound wave detection element of the present invention is used. .
  • the pressure vessel is not particularly limited, and is preferably a vessel made of a material whose sound transmittance and tensile strength are within the above ranges, and has high electrical insulation (electric resistivity is 1 ⁇ 10 12 ⁇ ⁇ cm).
  • the container made of the material also serves to prevent the electric charge held in the porous resin body from being electrically connected to the external environment and attenuated, thereby obtaining a highly sensitive acoustic wave detection element. It is preferable from the viewpoint of being able to
  • the pressure vessel may be appropriately selected according to the application in which the acoustic wave detection element of the present invention is used, and examples include containers made of metal materials, inorganic materials such as ceramics and glass, but organic materials such as resins, A container made of a composite material of an inorganic material and an organic material may be used. From the viewpoint of strength and electrical resistivity, a container made of a composite material of inorganic fibers (for example, glass fibers) and a resin material is preferable.
  • the acoustic impedance of the material constituting the pressure-resistant container is close to the acoustic impedance of the material constituting the porous resin body.
  • the acoustic impedance of the material constituting the pressure vessel is usually preferably 1 ⁇ 10 6 to 20 ⁇ 10 6 kg / m 2 ⁇ s, and preferably 1 ⁇ 10 6 to 10 ⁇ 10 6 kg / m 2 ⁇ s. More preferably, it is 1 ⁇ 10 6 to 4 ⁇ 10 6 kg / m 2 ⁇ s.
  • the shape of the pressure vessel is not particularly limited as long as it has an accommodating space inside, but preferably has a space in which the porous resin body can be accommodated.
  • Examples of the shape of the pressure vessel include a polyhedron such as a cube and a rectangular parallelepiped, a sphere, a cylinder, a cone, and the like.
  • the pressure vessel may be a partially opened vessel, but is preferably a sealed vessel from the viewpoint of efficiently blocking external force other than sound waves applied to the porous resin body.
  • the pressure vessel As the pressure vessel, a commercially available product may be used, or a product manufactured by a conventionally known method may be used.
  • Example 1 A sheet-like non-woven fabric (thickness 0.06 mm, pores) formed from PTFE fibers as a porous resin body by accumulating PTFE fibers in a sheet form by electrospinning described in JP-T-2012-515850 95% in average fiber diameter of 900 nm), and PFA sheet (thickness: 0.025 mm, manufactured by Daikin Industries, Ltd., NEOFLON PFA) as an insulating layer was laminated on the upper and lower surfaces of the nonwoven fabric and heated at 300 ° C. for 60 minutes A laminated sheet having an insulating layer formed on the front and back surfaces of the porous resin body was produced by pressure bonding.
  • this laminated sheet was polarized by -15 kV corona discharge irradiation, electrodes were formed on both sides (on the insulating layer) of the obtained laminated sheet by vapor deposition, and lead wires were drawn out to produce an organic piezoelectric element.
  • This organic piezoelectric element was attached to the inner surface of a pressure-resistant container (glass fiber reinforced plastic, thickness 2 mm) via a double-sided tape (manufactured by Sumitomo 3M Limited, FPR-12) to produce a sound wave detecting element.
  • a pressure-resistant container glass fiber reinforced plastic, thickness 2 mm
  • a double-sided tape manufactured by Sumitomo 3M Limited, FPR-12

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un élément de détection d'impacts qui possède : un corps de résine poreux constitué d'une résine exempte de dipôle résultant d'une structure moléculaire ou cristalline ; et un réceptacle résistant à la pression.
PCT/JP2015/063094 2014-05-01 2015-05-01 Élément de détection d'impacts WO2015167014A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016516425A JPWO2015167014A1 (ja) 2014-05-01 2015-05-01 音波検知素子

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Application Number Priority Date Filing Date Title
JP2014-094370 2014-05-01
JP2014094370 2014-05-01

Publications (1)

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WO2015167014A1 true WO2015167014A1 (fr) 2015-11-05

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JP2012164735A (ja) * 2011-02-04 2012-08-30 Sumitomo Electric Ind Ltd フッ素樹脂フィルム製圧電素子
JP2013110570A (ja) * 2011-11-21 2013-06-06 Nippon Ceramic Co Ltd 超音波送受波器

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