WO2023022066A1 - 超音波トランスデューサ - Google Patents
超音波トランスデューサ Download PDFInfo
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- WO2023022066A1 WO2023022066A1 PCT/JP2022/030394 JP2022030394W WO2023022066A1 WO 2023022066 A1 WO2023022066 A1 WO 2023022066A1 JP 2022030394 W JP2022030394 W JP 2022030394W WO 2023022066 A1 WO2023022066 A1 WO 2023022066A1
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- WIPO (PCT)
- Prior art keywords
- diaphragm
- hole
- piezoelectric element
- thickness direction
- resonator
- Prior art date
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- 230000000149 penetrating effect Effects 0.000 claims 2
- 230000002093 peripheral effect Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
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- 230000008602 contraction Effects 0.000 description 2
- 229920006332 epoxy adhesive Polymers 0.000 description 2
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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Classifications
-
- 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
- H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
Definitions
- the present disclosure relates to ultrasonic transducers.
- Patent Document 1 discloses an ultrasonic transducer.
- This ultrasonic transducer includes a piezoelectric vibrating body formed by bonding a piezoelectric body and a metal with an adhesive, and a funnel-shaped resonator fixed to the piezoelectric vibrating body.
- the piezoelectric vibrator is fixed on the base member via a cushioning material.
- the resonator vibrates when the ultrasonic transducer is driven, and stress is likely to be applied to the piezoelectric body (piezoelectric element) near the joint between the resonator and the metal (diaphragm). For this reason, there is concern that the piezoelectric body (piezoelectric element) may crack or break due to repeated driving of the ultrasonic transducer.
- An object of the present disclosure is to provide a technology capable of reducing the stress applied to the piezoelectric element due to the vibration of the resonator.
- a first ultrasonic transducer of the present invention comprises a base portion, a piezoelectric element bonded to the base portion, a diaphragm bonded to the piezoelectric element and vibrating so as to generate an annular node, a resonator bonded to the diaphragm.
- the resonator is bonded to the first surface on one side in the thickness direction of the diaphragm.
- the surface of the piezoelectric element opposite to the side bonded to the base portion is bonded to the second surface on the other side in the thickness direction of the diaphragm.
- a through hole is formed in the piezoelectric element so as to penetrate in the thickness direction. In a plane direction orthogonal to the thickness direction, the joint portion between the diaphragm and the resonator is arranged inside the node, and the through hole is arranged inside the node.
- the joint between the diaphragm and the resonator is arranged inside the vibration node of the diaphragm. Therefore, stress is likely to be applied to the piezoelectric element inside the node. However, the through-hole of the piezoelectric element is arranged in a region where stress from the joint is likely to be applied. Therefore, according to this ultrasonic transducer, the stress applied to the piezoelectric element due to the vibration of the resonator can be reduced.
- a second ultrasonic transducer of the present invention includes a base portion, an annular intermediate member bonded to the base portion, a piezoelectric element bonded to the base portion via the intermediate member, A diaphragm bonded to the piezoelectric element and vibrating to generate an annular node; and a resonator bonded to the diaphragm.
- a first surface on one side in the thickness direction of the diaphragm is bonded to the resonator.
- a second surface of the diaphragm on the other side in the thickness direction is bonded to a surface of the piezoelectric element opposite to the side bonded to the base portion.
- a through hole is formed in the piezoelectric element so as to penetrate in the thickness direction.
- the joint portion between the diaphragm and the resonator is arranged inside an inscribed circle that inscribes the intervening member, and the through hole is located inside the inscribed circle. placed inside.
- the joint between the diaphragm and the resonator is arranged inside the inscribed circle inscribed in the intervening member. For this reason, the diaphragm tends to vibrate inside the inscribed circle that inscribes the intervening member, and stress tends to be applied to the piezoelectric element inside the inscribed circle.
- the through-hole of the piezoelectric element is arranged in a region where stress from the joint is likely to be applied. Therefore, according to this ultrasonic transducer, the stress applied to the piezoelectric element due to the vibration of the resonator can be reduced.
- At least a portion of the joint portion may be arranged at a position overlapping the through hole.
- the entire joint portion When viewed from the thickness direction, the entire joint portion may be arranged at a position overlapping the through hole.
- the diaphragm may have a hole, and when viewed in the thickness direction, at least a part of the joint may be arranged at a position overlapping the hole.
- the diaphragm can be easily vibrated, and power consumption for vibrating the diaphragm can be reduced.
- the stress applied to the piezoelectric element due to the vibration of the resonator can be reduced.
- FIG. 1 is a cross-sectional view schematically showing the ultrasonic transducer of the first embodiment.
- FIG. 2 is a plan view of the piezoelectric element of the first embodiment.
- FIG. 3 is a plan view of the ultrasonic transducer of the first embodiment;
- FIG. 4 is a plan view of the piezoelectric element of the second embodiment.
- FIG. 5 is a plan view of the ultrasonic transducer of the second embodiment.
- FIG. 6 is a plan view of the piezoelectric element of the third embodiment.
- FIG. 7 is a plan view of the ultrasonic transducer of the third embodiment.
- FIG. 8 is a cross-sectional view of the diaphragm, piezoelectric element, and resonator of the fourth embodiment.
- FIG. 8 is a cross-sectional view of the diaphragm, piezoelectric element, and resonator of the fourth embodiment.
- FIG. 9 is a cross-sectional view of the diaphragm, piezoelectric element, and resonator of the fifth embodiment.
- FIG. 10 is a cross-sectional view of the diaphragm, piezoelectric element, and resonator of the sixth embodiment.
- An ultrasonic transducer 1 shown in FIG. 1 is used, for example, in a medical or industrial ultrasonic device.
- the ultrasonic transducer 1 generates an ultrasonic wave when receiving a driving signal, and converts the ultrasonic wave into an electric signal when receiving the ultrasonic wave.
- the ultrasonic transducer 1 includes a diaphragm 10, a piezoelectric element 11, a resonator 12, an intervening member 13, a base portion 14, a first wiring portion 15, a second wiring portion 16, and a case 17. Prepare.
- the diaphragm 10 has a plate shape (more specifically, a disc shape). Diaphragm 10 has electrical conductivity.
- the diaphragm 10 is made of metal such as 42 alloy (42Ni--Fe).
- the width (maximum width) of the diaphragm 10 is greater than the width (maximum width) of any of the resonator 12 , the intervening member 13 , and the piezoelectric element 11 .
- the width (maximum width) of diaphragm 10 is the length (maximum length) of diaphragm 10 in a direction orthogonal to the thickness direction. In this embodiment, the width (maximum width) of diaphragm 10 is the diameter of the outer periphery of diaphragm 10 .
- the diaphragm 10 vibrates so as to generate an annular (more specifically, annular) node 20 .
- the diaphragm 10 generates only one annular node 20 .
- the node 20 is a portion where the amount of displacement in the plate thickness direction is the smallest when the diaphragm 10 vibrates, or a portion where there is no vibration.
- the node 20 is uniquely determined by the shapes and materials of the diaphragm 10 , piezoelectric element 11 and resonator 12 . Although the piezoelectric element 11 is shown exaggeratedly large in FIG. 1, it is actually much smaller than the diaphragm 10 and the resonator 12.
- the position of the node 20 is generally determined by the shape and material of the diaphragm 10 and the resonator 12, and the influence of the shape and material of the piezoelectric element 11 on determining the position of the node 20 is small.
- the outer peripheral edge of diaphragm 10 is a free end.
- the ultrasonic transducer 1 is a so-called open type, and vibrates more easily than a closed type in which the outer periphery of the diaphragm 10 is fixed.
- the node 20 is generated inside the outer peripheral edge of the diaphragm 10 and outside the center in a plane direction perpendicular to the plate thickness direction. The vibration of diaphragm 10 increases from node 20 toward the outer periphery, and increases from node 20 toward the center.
- the diaphragm 10 has a first surface 21 on one side in the thickness direction and a second surface 22 on the other side.
- the resonator 12 is bonded to the first surface 21 .
- a piezoelectric element 11 is bonded to the second surface 22 .
- joining is a concept that includes not only a configuration of direct joining but also a configuration of joining via another member.
- the diaphragm 10 has holes 23 .
- the hole 23 is formed in the first surface 21 and has a shape in which the first surface 21 is recessed.
- the hole portion 23 is formed by cutting, for example.
- the hole portion 23 has a circular cross section cut along a plane orthogonal to the thickness direction of the diaphragm 10 and is constant in the thickness direction of the diaphragm 10 .
- the resonator 12 resonates with the vibration of the diaphragm 10 to generate ultrasonic waves.
- the resonator 12 has a function of increasing the efficiency of sound wave transmission of the diaphragm 10 that is excited by periodic power supply to the piezoelectric element 11 .
- the resonator 12 is made of metal such as aluminum alloy.
- a resonator 12 is bonded to the diaphragm 10 .
- the bonding method is not limited, and may be, for example, bonding with an adhesive such as an epoxy adhesive, soldering, ultrasonic welding, laser welding, or the like.
- the resonator 12 has a cone shape.
- the resonator 12 has a flat portion 12A and a tapered portion 12B.
- the flat portion 12A is flat and has a plate shape (more specifically, a disc shape). Flat portion 12A is joined to first surface 21 of diaphragm 10 .
- the flat portion 12A has a shape that fits inside the hole portion 23 and is joined to the bottom surface 23A of the hole portion 23 formed in the first surface 21 .
- the tapered portion 12B extends cylindrically from the outer peripheral edge of the flat portion 12A toward the side opposite to the diaphragm 10 side.
- the inner peripheral surface of the tapered portion 12B has a tapered shape that widens toward the side opposite to the diaphragm 10 side.
- the piezoelectric element 11 has a plate shape and is joined to the diaphragm 10 so as to be laminated.
- the piezoelectric element 11 is bonded to the diaphragm 10 with a thermosetting epoxy adhesive or the like.
- the piezoelectric element 11 has a rectangular shape when viewed from the thickness direction of the diaphragm 10, as shown in FIG.
- a through hole 30 is formed through the piezoelectric element 11 in the thickness direction of the diaphragm 10 .
- a cross-section of the through-hole 30 in a direction perpendicular to the through-hole direction is circular. As shown in FIG.
- the piezoelectric element 11 has a plate-like piezoelectric body 31 and electrodes 32 and 33 provided on both sides of the piezoelectric body 31 in the thickness direction.
- the piezoelectric body 31 is made of ceramics such as lead zirconate titanate (PZT) and potassium sodium niobate (KNN).
- PZT lead zirconate titanate
- KNN potassium sodium niobate
- One electrode 32 of electrodes 32 and 33 provided on both sides of the piezoelectric element 11 is joined to the diaphragm 10 and electrically connected to the first wiring portion 15 via the diaphragm 10 .
- the other electrode 33 of the electrodes 32 provided on both sides of the piezoelectric element 11 is electrically connected to the second wiring portion 16 .
- a base portion 14 is joined to the surface of the piezoelectric element 11 on the side opposite to the diaphragm 10 side with an intervening member 13 interposed therebetween.
- the intervening member 13 is arranged between the piezoelectric element 11 and the base portion 14 and joined to the piezoelectric element 11 and the base portion 14 respectively.
- the intervening member 13 has insulation and elasticity.
- the intervening member 13 has a Young's modulus lower than that of the base portion 14 .
- the intervening member 13 is made of, for example, rubber such as silicone rubber, or resin such as silicon-based adhesive.
- the intervening member 13 has an annular shape (more specifically, an annular shape).
- the axial direction of the intervening member 13 is along the thickness direction of the diaphragm 10 , and more specifically, is the same as the thickness direction of the diaphragm 10 .
- Interposed member 13 has vibration nodes 20 arranged between an inscribed circle 13A that inscribes interposed member 13 and a circumscribed circle 13B that circumscribes intervening member 13 in a planar direction perpendicular to the plate thickness direction of diaphragm 10. (see FIG. 3).
- the base portion 14 is made of synthetic resin and configured as a resin base.
- the base portion 14 has a plate shape.
- the thickness direction of the base portion 14 is along the thickness direction of the diaphragm 10 , and more specifically, is the same as the thickness direction of the diaphragm 10 .
- the first wiring portion 15 has a metal first terminal 15A and a first coil spring 15B.
- a first base through-hole 14A is formed through the base portion 14 in the thickness direction.
- the first wiring portion 15 is inserted through the first base through hole 14A.
- the first terminal 15A is fixed to the base portion 14 at a position that closes the opening of the first base through hole 14A on the side opposite to the diaphragm 10 side.
- the expansion and contraction direction of the first coil spring 15B is along the thickness direction of the diaphragm 10, more specifically, the same as the thickness direction.
- the first coil spring 15B is sandwiched between the diaphragm 10 and the first terminal 15A, and is compressed by being pressed by the diaphragm 10 and the first terminal 15A.
- One end of the first coil spring 15B contacts the diaphragm 10, and the other end contacts the first terminal 15A.
- the first wiring portion 15 is electrically connected to one of the positive electrode side conductive path and the negative electrode side conductive path (
- the second wiring portion 16 has a metal second terminal 16A and a second coil spring 16B.
- a second base through-hole 14B is formed through the base portion 14 in the thickness direction.
- the second wiring portion 16 is inserted through the second base through hole 14B.
- the second terminal 16A is fixed to the base portion 14 at a position that closes the opening of the second base through hole 14B on the side opposite to the diaphragm 10 side.
- the expansion and contraction direction of the second coil spring 16B is along the thickness direction of the diaphragm 10, more specifically, the same as the thickness direction.
- the second coil spring 16B is sandwiched between the piezoelectric element 11 and the second terminal 16A, and is compressed by being pressed by the piezoelectric element 11 and the second terminal 16A.
- the second wiring portion 16 is electrically connected to the other conductive path of the positive electrode side conductive path and the negative electrode side conductive path (for example, ground).
- the case 17 is a member that protects the resonator 12 so that foreign matter does not come into contact with the resonator 12 .
- Case 17 is fixed to base portion 14 .
- the case 17 has a peripheral wall portion 17A surrounding the resonator 12 .
- a plurality of openings are formed in the case 17 on the opposite side of the resonator 12 to the base portion 14 side, and ultrasonic waves are sent to the outside through these openings and enter the case 17 from the outside.
- the joint 40 between the diaphragm 10 and the resonator 12 is arranged inside the node 20, and the piezoelectric element 11 through-holes 30 are arranged inside the node 20 . Further, in the plane direction, the joint 40 between the diaphragm 10 and the resonator 12 is arranged inside the inscribed circle 13A that inscribes the intervening member 13, and the through hole 30 is arranged inside the inscribed circle 13A. are placed. Further, when viewed from the thickness direction of diaphragm 10 , joint portion 40 is arranged at a position where the entire joint portion 40 overlaps with through hole 30 . Further, when viewed from the thickness direction of diaphragm 10 , joint portion 40 is arranged at a position where the entire joint portion 40 overlaps with hole portion 23 .
- the joint 40 between the diaphragm 10 and the resonator 12 is arranged inside the vibration nodes 20 of the diaphragm 10 . Therefore, stress is likely to be applied to the piezoelectric element 11 inside the node 20 .
- the through hole 30 of the piezoelectric element 11 is arranged in a region where the stress from the joint 40 is likely to be applied. Therefore, according to this ultrasonic transducer 1, the stress applied to the piezoelectric element 11 due to the vibration of the resonator 12 can be reduced.
- the joint 40 between the diaphragm 10 and the resonator 12 is arranged inside the inscribed circle 13A that inscribes the intervening member 13 . Therefore, the diaphragm 10 tends to vibrate inside the inscribed circle 13A that inscribes the interposed member 13, and stress is likely to be applied to the piezoelectric element 11 inside the inscribed circle 13A.
- the through hole 30 of the piezoelectric element 11 is arranged in a region where the stress from the joint 40 is likely to be applied. Therefore, according to this ultrasonic transducer 1, the stress applied to the piezoelectric element 11 due to the vibration of the resonator 12 can be reduced.
- the entire joint portion 40 is arranged at a position overlapping the through hole 30 . Therefore, since the joint 40 as a whole is arranged at a position overlapping the through hole 30 , the stress applied to the piezoelectric element 11 due to the vibration of the resonator 12 can be reduced more effectively.
- the entire joint portion 40 is arranged at a position overlapping the hole portion 23 . Therefore, the diaphragm 10 can be easily vibrated, and the power consumption for vibrating the diaphragm 10 can be reduced.
- ⁇ Second embodiment> In the first embodiment, when viewed from the thickness direction of the diaphragm, the joint is arranged at a position where the entire joint overlaps the through hole, but the joint is arranged at a position where the entire joint overlaps with the through hole. It doesn't have to be.
- the second embodiment an example will be described in which a part of the joint portion is arranged at a position overlapping the through hole when viewed from the thickness direction of the diaphragm.
- the ultrasonic transducer of the second embodiment differs from the ultrasonic transducer of the first embodiment only in the shape of the piezoelectric element, and the other points are common.
- the same reference numerals are given to the configurations common to the first embodiment, and detailed description thereof will be omitted.
- the piezoelectric element 211 of the second embodiment has a rectangular shape when viewed from the thickness direction of the diaphragm 10, as shown in FIG.
- a through hole 230 is formed through the piezoelectric element 211 in the thickness direction of the diaphragm 10 .
- the cross-sectional shape of through-hole 230 obtained by cutting through-hole 230 along a plane orthogonal to the direction of penetration of through-hole 230 is rectangular.
- the through hole 230 has a portion that does not overlap the joint portion 40 when viewed from the thickness direction of the diaphragm 10 .
- the ultrasonic transducer 201 of the second embodiment is arranged at a position where a part of the joint 40 overlaps the through hole 230 when viewed from the thickness direction. Therefore, in the ultrasonic transducer 201, the stress applied to the piezoelectric element 211 due to the vibration of the resonator 12 can be effectively reduced as compared with the configuration in which the joint portion 40 is arranged at a position that does not overlap the through hole 230 at all. can be effectively reduced.
- the ultrasonic transducer of the third embodiment differs from the ultrasonic transducer of the first embodiment only in the shape of the piezoelectric element, and is common in other respects.
- the same reference numerals are given to the configurations common to the first embodiment, and detailed description thereof will be omitted.
- the piezoelectric element 311 of the third embodiment has a rectangular shape when viewed from the thickness direction of the diaphragm 10, as shown in FIG.
- a through hole 330 is formed through the piezoelectric element 311 in the thickness direction of the diaphragm 10 .
- the cross-sectional shape of through-hole 330 obtained by cutting through-hole 330 along a plane perpendicular to the through-hole direction is circular.
- a plurality of through holes 330 (five in this embodiment) are formed in the piezoelectric element 311 . More specifically, one through hole 330A is formed in the center of the piezoelectric element 311, and four through holes 330B are formed around the through hole 330A.
- a portion of the joint 40 between the diaphragm 10 and the resonator 12 is arranged at a position overlapping the through hole 330 .
- the ultrasonic transducer 301 of the third embodiment is arranged at a position where a part of the joint 40 overlaps the through hole 330 when viewed from the thickness direction. Therefore, in the ultrasonic transducer 301, the stress applied to the piezoelectric element 311 due to the vibration of the resonator 12 can be effectively reduced as compared with the configuration in which the joint portion 40 is arranged at a position that does not overlap the through hole 330 at all. can be effectively reduced.
- the diaphragm has a hole, but the diaphragm may have no hole.
- the ultrasonic transducer of the fourth embodiment differs from the ultrasonic transducer of the first embodiment in that the diaphragm does not have a hole, but is common in other respects.
- the same reference numerals are given to the configurations common to the first embodiment, and detailed description thereof will be omitted.
- the ultrasonic transducer of the fourth embodiment includes a diaphragm 410, a piezoelectric element 11, and a resonator 12, as shown in FIG.
- the diaphragm 410 has the same configuration as the diaphragm 10 of the first embodiment except that it does not have a hole. That is, both surfaces in the thickness direction of diaphragm 410 are flat. The thickness of diaphragm 410 is uniform throughout diaphragm 410 . According to the ultrasonic transducer of the fourth embodiment, since the diaphragm 410 does not have a hole, molding of the diaphragm 410 is easy.
- the hole portion of the diaphragm is formed by cutting, but the hole portion of the diaphragm may be formed by another method.
- the hole portion of the diaphragm is formed by half-blanking.
- the ultrasonic transducer of the fifth embodiment differs from the ultrasonic transducer of the first embodiment in that the hole in the diaphragm is formed by half-blanking, but is common in other respects.
- the same reference numerals are given to the configurations common to the first embodiment, and detailed description thereof will be omitted.
- the ultrasonic transducer of the fifth embodiment includes a diaphragm 510, a piezoelectric element 11, and a resonator 12, as shown in FIG.
- the diaphragm 510 has a first surface 521 on one side in the thickness direction and a second surface 522 on the other side.
- the resonator 12 is bonded to the first surface 521 .
- the piezoelectric element 11 is bonded to the second surface 522 .
- the diaphragm 510 has a hole portion 523 and a convex portion 524 .
- the hole 523 is formed in the first surface 521 and has a shape in which the first surface 521 is recessed. Hole 523 is formed by half-blanking.
- the hole portion 523 has a circular cross section cut along a plane orthogonal to the thickness direction of the diaphragm 510 and is constant in the thickness direction of the diaphragm 510 .
- the flat portion 12A of the resonator 12 is fitted in the hole portion 523 and joined to the bottom surface 523A of the hole portion 523 .
- the convex portion 524 is formed on the second surface 522 . At least part of the protrusion 524 is arranged at a position overlapping the hole 523 when viewed from the thickness direction of the diaphragm 510 . The convex portion 524 is formed when the hole portion 523 is formed by half punching. The protrusion 524 fits into the through hole 30 of the piezoelectric element 11 . The projection dimension of the convex portion 524 is smaller than the thickness of the piezoelectric element 11 . Therefore, the protrusion 524 does not protrude outside the through hole 30 .
- shavings are less likely to occur than in the case where the hole of the diaphragm is formed by cutting.
- ⁇ Sixth embodiment> In the first embodiment, the hole portion of the diaphragm does not pass through the diaphragm, but the hole portion may pass through the diaphragm.
- the hole portion of the diaphragm In the sixth embodiment, an example in which the hole portion of the diaphragm penetrates the diaphragm will be described.
- the ultrasonic transducer of the sixth embodiment differs from the ultrasonic transducer of the first embodiment in that the hole in the diaphragm penetrates the diaphragm, but is common in other respects.
- the same reference numerals are given to the configurations common to the first embodiment, and detailed description thereof will be omitted.
- the ultrasonic transducer of the sixth embodiment includes a diaphragm 610, a piezoelectric element 11, and a resonator 12, as shown in FIG.
- the diaphragm 610 has a first surface 621 on one side in the thickness direction and a second surface 622 on the other side.
- the resonator 12 is bonded to the first surface 621 .
- the piezoelectric element 11 is joined to the second surface 622 .
- the diaphragm 610 has holes 623 .
- the hole 623 has a shape that penetrates through the diaphragm 610 in the thickness direction.
- the hole portion 623 is arranged so as to be accommodated inside the outer peripheral edge of the flat portion 12A of the resonator 12 in the plane direction perpendicular to the thickness direction of the diaphragm 610 .
- the hole portion 623 is arranged so as to be accommodated inside the inner wall of the through hole 30 in a plane direction perpendicular to the thickness direction of the diaphragm 610 .
- the hole 623 has a circular cross section cut along a plane orthogonal to the thickness direction of the diaphragm 610 and is constant in the thickness direction of the diaphragm 610 .
- the joint portion when viewed from the thickness direction of the diaphragm, at least a portion of the joint portion is arranged at a position overlapping the through hole, but the joint portion does not overlap the through hole at all. may be configured to be placed in
- first coil spring and the second coil spring are not joined in each of the above embodiments, they may be joined.
- a joining method is not limited, and examples thereof include soldering, laser welding, and ultrasonic welding.
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- Engineering & Computer Science (AREA)
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- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
図1に示す超音波トランスデューサ1は、例えば医療用または産業用の超音波装置に用いられる。超音波トランスデューサ1は、駆動信号が与えられた場合に超音波を発生し、超音波を受信した場合に超音波を電気信号に変換する。
第1実施形態の超音波トランスデューサ1では、振動板10と共振子12との接合部40が振動板10の振動の節20よりも内側に配置されている。このため、節20よりも内側において、圧電素子11に応力が加わりやすくなってしまう。しかし、この接合部40からの応力が加わりやすい領域に、圧電素子11の貫通孔30が配置されている。このため、この超音波トランスデューサ1によれば、共振子12の振動に起因して圧電素子11に加わる応力を低減させうる。
第1実施形態では、振動板の厚さ方向から見た場合に、接合部の全体が貫通孔と重なる位置に配置されていたが、接合部の全体が貫通孔と重なる位置に配置される構成でなくてもよい。第2実施形態では、振動板の厚さ方向から見た場合に、接合部の一部が貫通孔と重なる位置に配置される例について説明する。なお、第2実施形態の超音波トランスデューサは、圧電素子の形状のみが第1実施形態の超音波トランスデューサとは異なり、その他の点で共通する。以下の説明では、第1実施形態と共通する構成については同じ符号を付し、詳しい説明を省略する。
第1実施形態では、圧電素子に形成される貫通孔の数が1であったが、複数であってもよい。第3実施形態では、圧電素子に複数の貫通孔が形成される例について説明する。なお、第3実施形態の超音波トランスデューサは、圧電素子の形状のみが第1実施形態の超音波トランスデューサとは異なり、その他の点で共通する。以下の説明では、第1実施形態と共通する構成については同じ符号を付し、詳しい説明を省略する。
第1実施形態では、振動板が穴部を有する構成であったが、振動板が穴部を有さない構成であってもよい。第4実施形態の超音波トランスデューサは、振動板が穴部を有さない点で第1実施形態の超音波トランスデューサとは異なり、その他の点で共通する。以下の説明では、第1実施形態と共通する構成については同じ符号を付し、詳しい説明を省略する。
第1実施形態では、振動板の穴部が切削加工によって形成される構成であったが、振動板の穴部が別の方法によって形成される構成であってもよい。第5実施形態では、振動板の穴部が半抜きによって形成される例を説明する。第5実施形態の超音波トランスデューサは、振動板の穴部が半抜きによって形成される点で第1実施形態の超音波トランスデューサとは異なり、その他の点で共通する。以下の説明では、第1実施形態と共通する構成については同じ符号を付し、詳しい説明を省略する。
第1実施形態では、振動板の穴部が振動板を貫通しない構成であったが、穴部が振動板を貫通する構成であってもよい。第6実施形態では、振動板の穴部が振動板を貫通する例を説明する。第6実施形態の超音波トランスデューサは、振動板の穴部が振動板を貫通する点で第1実施形態の超音波トランスデューサとは異なり、その他の点で共通する。以下の説明では、第1実施形態と共通する構成については同じ符号を付し、詳しい説明を省略する。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。また、上述した実施形態や後述する実施形態の様々な特徴は、矛盾しない組み合わせであればどのように組み合わされてもよい。
10…振動板
11…圧電素子
12…共振子
12A…平坦部
12B…テーパ部
13…介在部材
13A…内接円
13B…外接円
14…ベース部
14A…第1ベース貫通孔
14B…第2ベース貫通孔
15…第1配線部
15A…第1端子
15B…第1コイルバネ
16…第2配線部
16A…第2端子
16B…第2コイルバネ
17…ケース
17A…周壁部
20…節
21…第1面
22…第2面
23…穴部
23A…底面
30…貫通孔
31…圧電体
32…電極
33…電極
40…接合部
201…超音波トランスデューサ
211…圧電素子
230…貫通孔
301…超音波トランスデューサ
311…圧電素子
330…貫通孔
330A…貫通孔
330B…貫通孔
410…振動板
510…振動板
521…第1面
522…第2面
523…穴部
610…振動板
621…第1面
622…第2面
623…穴部
Claims (5)
- ベース部と、
前記ベース部に接合される圧電素子と、
前記圧電素子に接合され、環状の節を生じさせるように振動する振動板と、
前記振動板に接合される共振子と、
を備え、
前記振動板における厚さ方向の一方側の第1面には、前記共振子が接合され、
前記振動板における前記厚さ方向の他方側の第2面には、前記圧電素子における前記ベース部に接合される側とは反対側の面が接合され、
前記圧電素子には、前記厚さ方向に貫通する貫通孔が形成されており、
前記厚さ方向と直交する平面方向において、前記振動板と前記共振子との接合部が前記節よりも内側に配置され、且つ前記貫通孔が前記節よりも内側に配置されている
超音波トランスデューサ。 - ベース部と、
環状をなし、前記ベース部に接合される介在部材と、
前記介在部材を介して前記ベース部に接合される圧電素子と、
前記圧電素子に接合され、環状の節を生じさせるように振動する振動板と、
前記振動板に接合される共振子と、
を備え、
前記振動板における厚さ方向の一方側の第1面は、前記共振子に接合され、
前記振動板における前記厚さ方向の他方側の第2面は、前記圧電素子における前記ベース部に接合される側とは反対側の面に接合され、
前記圧電素子には、前記厚さ方向に貫通する貫通孔が形成されており、
前記厚さ方向と直交する平面方向において、前記振動板と前記共振子との接合部が前記介在部材に内接する内接円よりも内側に配置され、且つ前記貫通孔が前記内接円よりも内側に配置されている
超音波トランスデューサ。 - 前記厚さ方向から見た場合に、前記接合部の少なくとも一部が前記貫通孔と重なる位置に配置されている
請求項1又は請求項2に記載の超音波トランスデューサ。 - 前記厚さ方向から見た場合に、前記接合部の全体が前記貫通孔と重なる位置に配置されている
請求項3に記載の超音波トランスデューサ。 - 前記振動板は、穴部を有し、
前記厚さ方向から見た場合に、前記接合部の少なくとも一部が前記穴部と重なる位置に配置されている
請求項1から請求項4のいずれか一項に記載の超音波トランスデューサ。
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5647599U (ja) * | 1979-09-17 | 1981-04-27 | ||
JPH08140197A (ja) * | 1994-11-04 | 1996-05-31 | Matsushita Electric Ind Co Ltd | 超音波送信器 |
JP2001258098A (ja) | 2000-03-09 | 2001-09-21 | Murata Mfg Co Ltd | 超音波トランスジューサ |
JP2005229227A (ja) * | 2004-02-12 | 2005-08-25 | Citizen Watch Co Ltd | 圧電型振動子 |
JP2013175935A (ja) * | 2012-02-24 | 2013-09-05 | Taiheiyo Cement Corp | パラメトリックスピーカおよびその製造方法 |
JP2014082572A (ja) * | 2012-10-15 | 2014-05-08 | Nec Casio Mobile Communications Ltd | 電気音響変換器 |
JP2014128019A (ja) * | 2012-12-27 | 2014-07-07 | Taiheiyo Cement Corp | 超音波素子およびパラメトリックスピーカ |
JP2015012384A (ja) * | 2013-06-27 | 2015-01-19 | 太平洋セメント株式会社 | 超音波発音体、超音波素子およびこれを用いたパラメトリックスピーカ |
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Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5647599U (ja) * | 1979-09-17 | 1981-04-27 | ||
JPH08140197A (ja) * | 1994-11-04 | 1996-05-31 | Matsushita Electric Ind Co Ltd | 超音波送信器 |
JP2001258098A (ja) | 2000-03-09 | 2001-09-21 | Murata Mfg Co Ltd | 超音波トランスジューサ |
JP2005229227A (ja) * | 2004-02-12 | 2005-08-25 | Citizen Watch Co Ltd | 圧電型振動子 |
JP2013175935A (ja) * | 2012-02-24 | 2013-09-05 | Taiheiyo Cement Corp | パラメトリックスピーカおよびその製造方法 |
JP2014082572A (ja) * | 2012-10-15 | 2014-05-08 | Nec Casio Mobile Communications Ltd | 電気音響変換器 |
JP2014128019A (ja) * | 2012-12-27 | 2014-07-07 | Taiheiyo Cement Corp | 超音波素子およびパラメトリックスピーカ |
JP2015012384A (ja) * | 2013-06-27 | 2015-01-19 | 太平洋セメント株式会社 | 超音波発音体、超音波素子およびこれを用いたパラメトリックスピーカ |
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