WO2008065959A1 - Transducteur à ultrasons - Google Patents
Transducteur à ultrasons Download PDFInfo
- Publication number
- WO2008065959A1 WO2008065959A1 PCT/JP2007/072634 JP2007072634W WO2008065959A1 WO 2008065959 A1 WO2008065959 A1 WO 2008065959A1 JP 2007072634 W JP2007072634 W JP 2007072634W WO 2008065959 A1 WO2008065959 A1 WO 2008065959A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outer case
- vibration
- notch
- case
- ultrasonic transducer
- Prior art date
Links
- 239000000945 filler Substances 0.000 claims description 10
- 230000000452 restraining effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 10
- 238000005452 bending Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- 239000011358 absorbing material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
- G10K9/22—Mountings; Casings
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
-
- 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
- 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
Definitions
- the present invention relates to an ultrasonic transducer that performs signal conversion between an ultrasonic signal and an electric signal.
- a directivity control body that controls the shape of the ultrasonic beam on the inner bottom surface of the outer case to which the piezoelectric element is attached make sure they are in close contact.
- This directivity control body is a member in which a hole having a major axis in one direction with respect to a planar direction is formed, and the length of the hole of the directivity control body is adjusted by being in close contact with the inner bottom surface of the outer case.
- the effective vibration area of the ultrasonic wave in the axial direction is expanded, and the effective vibration area of the ultrasonic wave in the short axis direction (direction perpendicular to the long axis direction) of the hole of the directivity control body is narrowed.
- the ultrasonic vibration operation surface the more the contact portion of the outer case becomes. A lot of mass is applied, and the mass restrains the vibration of the outer case. Hereinafter, this mass is referred to as restrained mass. In this way, there is a difference in the effective vibration region between the long axis direction and the short axis direction of the hole of the directivity control body, and the restrained mass with respect to the bottom surface of the outer case at both sides of the long axis of the hole is relatively increased.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-128292
- the ultrasonic vibration operation of the directivity control body is not rotationally symmetric at an arbitrary angle (180 degree rotationally symmetric). This contributes to flattening of the beam shape, but at the same time a large bending mode ( A vibration in a vibration mode in which the effective vibration region is alternately distorted in the major axis direction and the minor axis direction of the hole is also generated, and unnecessary vibration (high-order spurious) is generated separately from the fundamental vibration. Since the frequency of this unnecessary vibration is close to the resonance frequency of the fundamental vibration, it is easily excited together with the fundamental vibration. As a result, it continues to vibrate for up to one vibration in this unwanted vibration mode, which adversely affects the reverberation characteristics.
- the piezoelectric element continues to generate an electric signal due to the vibration due to the reverberation. Therefore, the electric signal based on the vibration of the piezoelectric element due to the ultrasonic wave reflected by the obstacle is generated. It will be extinguished by the electric signal of vibration due to reverberation, and it will not be possible to detect the ultrasonic waves reflected by the obstacle.
- An object of the present invention is to provide an ultrasonic transducer capable of obtaining an excellent fundamental vibration that prevents unnecessary vibration and suppresses reverberation while having a case structure for flattening an ultrasonic beam. is there.
- the present invention provides a bottomed cylindrical outer case, a piezoelectric element provided on the inner bottom surface of the outer case, and an ultrasonic vibration that is provided on the inner case and faces the inner bottom surface of the outer case.
- an ultrasonic transducer comprising an inner case that restrains vibration by the piezoelectric element of the outer case on the working surface by mass, and a terminal that is electrically connected to the piezoelectric element
- the inner case is an ultrasonic vibration working surface.
- the first notch for flattening the ultrasonic beam generated by the vibration of the piezoelectric element and the outer case is provided at a portion facing the position where the piezoelectric element is disposed, and the first of the ultrasonic vibration working surfaces is the first.
- the second feature is that a second cutout or engraved second cutout is provided.
- the "first notch for flattening the ultrasonic beam” is an ultrasonic vibration working surface of the inner case that faces the inner bottom surface that is the vibration surface of the outer case, and is This is a notch for creating anisotropy in the minor axis direction and thereby flattening the directivity.
- it is an oval or rectangular notch whose major axis is one direction with respect to the plane direction, and the presence of this first notch makes the left / right / up / down aspect ratio of the effective vibration area of the outer case 1 It is something that makes it bigger.
- the beam shape is flattened so that, for example, the horizontal width of the ultrasonic beam is different from the vertical width of the ultrasonic beam width, and the mass that binds the outer case together with the first notch portion.
- the second notch exists at a position where the distribution of the water becomes uniform. In other words, the mass balance of the inner case that restrains the outer case is balanced, and unnecessary vibration such as bending mode is suppressed.
- the first notch has a shape having a major axis in one direction along a surface facing the inner bottom surface of the outer case, and the second notch is a major axis. It is placed in a line-symmetrical position on both sides.
- the second notch is present at a position where the mass of restraint with respect to the outer case is large, so that the mass balance of the mass restraining the outer case is achieved. Unnecessary vibration such as bending mode is effectively suppressed.
- the second cutout portion forms a bank portion around the first cutout portion due to the presence of the second cutout portion, and is formed on the entire surface outside the bankportion.
- the second notch extends to the corner (ridge) of the inner case, even if there is a dimensional error between the inner case and the outer case, the ultrasonic vibration operation surface of the inner case and the outer case It is possible to reliably prevent unnecessary mode vibrations caused by the above-described mass balance loss, which does not cause the degree of close contact with the inner bottom surface of the case to be unbalanced.
- the medium density of the inner case is set higher than the medium density of the outer case.
- the resonance vibration of the side surface of the outer case can be suppressed as much as the vibration of the bottom surface of the outer case can be suppressed, and reverberation can be further suppressed.
- a space formed by the second cutout portion of the inner case and the inner bottom surface of the outer case is filled with a filler having a medium density lower than that of the inner case and the outer case.
- the bank portion is formed between the first notch portion and the second notch portion, the filler acting as a damping material reaches the effective vibration region of the piezoelectric element. It is possible to prevent the fundamental vibration in the effective vibration region of the piezoelectric element that cannot reach from being affected.
- a through hole is formed in the second cutout portion.
- filling can be performed simply by injecting a filler or the like into the inner bottom surface of the outer case and the second notch through the through hole from the inside of the inner case.
- a filler or the like into the inner bottom surface of the outer case and the second notch through the through hole from the inside of the inner case.
- the outer case and the inner case can be bonded with the above-mentioned filler, so that an adhesive only for bonding the outer case and the inner case becomes unnecessary.
- the present invention has a structure in which both ends of the first cutout portion in the long axis direction reach the end portion of the case, and a third cutout portion is provided in the longitudinal direction of the bank portion. .
- an ultrasonic transducer that can obtain an excellent fundamental vibration that can prevent unnecessary vibration and suppress reverberation, while having a case structure for flattening an ultrasonic beam.
- FIG. 1 is a cross-sectional view showing a configuration of an ultrasonic transducer according to a first embodiment.
- FIG. 2 is a perspective view of an inner case used in the ultrasonic transducer.
- FIG. 3 is a perspective view of an inner case used in an ultrasonic transducer according to a second embodiment and an ultrasonic transducer as a comparative example thereof.
- 4 is a diagram showing impedance characteristics with respect to frequency of the ultrasonic transducer having the inner case shown in FIG. 3.
- FIG. 3 is a perspective view of an inner case used in an ultrasonic transducer according to a second embodiment and an ultrasonic transducer as a comparative example thereof. 4 is a diagram showing impedance characteristics with respect to frequency of the ultrasonic transducer having the inner case shown in FIG. 3.
- FIG. 3 is a perspective view of an inner case used in an ultrasonic transducer according to
- FIG. 5 is a diagram showing the reverberation characteristics of an ultrasonic transducer including the inner case shown in FIG.
- FIG. 6 is a perspective view of an inner case used in an ultrasonic transducer according to a third embodiment.
- FIG. 7 is a diagram showing a vibration mode of an inner bottom surface of an outer case of an ultrasonic transducer according to a third embodiment and an ultrasonic transducer of a comparative example thereof.
- FIG. 8 is a diagram showing reverberation characteristics of an ultrasonic transducer according to a third embodiment and an ultrasonic transducer of a comparative example.
- FIG. 9 is a diagram showing directivity characteristics of an ultrasonic transducer according to a third embodiment and an ultrasonic transducer of a comparative example thereof.
- FIG. 10 is a cross-sectional view showing a configuration of an ultrasonic transducer according to a fourth embodiment. Explanation of symbols
- FIG. 1 is a cross-sectional view of the main part of the ultrasonic transducer according to the first embodiment
- FIG. 2 is a perspective view as seen from the upper surface side of the inner case.
- a case is composed of two members, an outer case 1 and an inner case 2, which are joined together.
- the outer case 1 is made of, for example, aluminum, and a disk-shaped piezoelectric element 3 is bonded to the inner bottom surface thereof.
- the piezoelectric element 3 has electrodes on both sides, and one electrode is electrically connected to the outer case 1.
- the inner case 2 is made of a material higher than the medium density of the outer case 1, for example, zinc.
- the surface opposite to the inner bottom surface (ceiling surface in the figure) of the outer case 1 (ultrasonic vibration acting surface) is oblong.
- the first notch portion 11 and the second notch portions 12a and 12b are formed at positions away from the first notch portion 11.
- the ultrasonic vibration acting surface (upper surface in the figure) of the inner case 2 has second notches 12a, 12b symmetrically about the major axis of the first notch 11 as the axis of symmetry. Is arranged. For this reason, the distribution of the mass constraining the outer case 1 together with the first notch is made uniform, and unnecessary vibration such as bending mode is suppressed. This unnecessary vibration suppression effect!
- the unwanted vibration described above occurs on the ultrasonic vibration acting surface of the inner case 2 in contact with the inner bottom surface of the outer case 1 with respect to the major axis direction and the major axis direction of the effective vibration region of the piezoelectric element 3 and the outer case 1. This is thought to occur because the restrained mass is not balanced with the short axis direction, which is the vertical direction.
- the effective vibration region corresponds to a portion of the bottom surface of the outer case 1 to which the piezoelectric element is bonded and the first notch portion of the ultrasonic vibration acting surface of the inner case 2 faces.
- the major axis direction L of the effective vibration region is the first notch 11 corresponds to the major axis direction
- the minor axis direction S of the effective vibration region corresponds to a direction perpendicular to the major axis direction of the first notch 11.
- the longitudinal direction L of the first notch is such that the portion where the ultrasonic vibration acting surface of the inner case 2 is in contact with the inner bottom of the outer case 1 is small.
- a relatively small restraining mass force is not applied to the minor axis direction S of the.
- the vibration energy is concentrated in the major axis direction L of the first notch, and the vibration energy is easily propagated in the major axis direction L of the first notch.
- a difference in vibration energy occurs between the major axis direction L and the minor axis direction S of the first notch, and anisotropy occurs.
- the second notches 12a and 12b are arranged in line symmetry with the long axis of the first notch 11 as the symmetry axis on the ultrasonic vibration acting surface of the inner case 2.
- the distribution of the constraining mass that restrains the outer case 1 together with the first notch is made uniform between the major axis direction L and the minor axis direction S of the first notch part, and the anisotropy is maintained. Unnecessary vibration such as bending mode can be suppressed.
- the medium density of the inner case 2 is higher than the medium density of the outer case 1.
- the vibration of the piezoelectric element joined to the bottom surface of the outer case 1 is also transmitted to the side surface of the outer case 1 to generate reverberation.
- the inner case 2 having a medium density higher than the medium density of the outer case 1 is joined from the inside of the outer case 1, thereby suppressing the vibration of the side surface of the outer case 1 from the inside of the outer case 1. Therefore, the resonance vibration of the side surface of the external case 1 can be suppressed.
- FIG. 3 is a diagram showing the shape of the inner case used in the ultrasonic transducer according to the second embodiment.
- Fig. 3 (A) is a perspective view of the inner case used in the ultrasonic transducer according to the second embodiment as seen from the ultrasonic vibration acting surface side
- Fig. 3 (B) is an inner case of the ultrasonic transducer as a reference example.
- the force in which the first notch portions 11a and l ib and the second notch portions 12a and 12b are provided on the ultrasonic vibration acting surface of the inner case 2 is described.
- the first notch for the purpose of flattening the ultrasonic beam is formed separately at a position facing 180 ° across the central through hole.
- the presence of the second notches 12a and 12b forms a bank around the first notches 11a and lib (and also around the through holes).
- the second notches 12a and 12b are formed on the entire outer surface of the bank portion.
- FIG. 4 is a plot of the impedance waveform versus frequency of the ultrasonic transducer having the inner case shown in FIG. Each three samples are plotted! /.
- the impedance R is the real part of the impedance characteristic I Z I of the sensor and corresponds to the antiresonance point in I Z I.
- the existence of an anti-resonance point means that there is a vibration mode near that frequency, and therefore it is desirable that the impedance R has no peak other than the fundamental vibration.
- Fig. 4 (A) shows the case using the inner case shown in Fig. 3 (A)
- Fig. 4 (B) shows the case using the inner case shown in Fig. 3 (B).
- the deviation is also a force that shows a large vibration peak in the vicinity of 50 kHz.
- Fig. 4 (B) a small peak is seen in the vicinity of 65 kHz. It can be seen that the unnecessary vibration mode due to.
- FIG. 4A of the present invention shows that the above unnecessary vibration mode is hardly seen.
- FIG. 5 shows the results of measuring the reverberation characteristics of the two ultrasonic transducers.
- FIG. 5A shows the characteristics of the ultrasonic transducer according to the second embodiment
- FIG. 5B shows the characteristics of the ultrasonic transducer of the comparative example.
- the left T1 period in Fig. 5 (A) is the transmitted wave (driving period), and the vibration in the subsequent T2 period is due to the reflected wave.
- one square on the horizontal axis is 0.1 ms.
- Fig. 5 (B) if the reverberation continues for a long time after the end of the driving section, it can be seen that no reflected wave can be detected.
- a damping material is not applied as in the prior art to prevent unnecessary vibrations, a characteristic with high transmission / reception sensitivity can be obtained.
- the second notch is not limited to the shape described in the first and second embodiments, but may be a notch, a carved shape, a tapered shape, or the like.
- FIG. 6 is a diagram showing the shape of the inner case used in the ultrasonic transducer according to the third embodiment.
- the force in which the first notch portions 11a and l ib and the second notch portions 12a and 12b are provided on the ultrasonic vibration acting surface of the inner case 2 Second Embodiment Unlike the case, both ends of the first notch in the long axis direction reach the end of the ultrasonic vibration acting surface of the inner case 2.
- the third notches 15a and 15b are provided in the middle of the longitudinal portions of the supporting portions 13a and 13b formed between the first notches 11a and 11b and the second notches 12a and 12b. .
- FIG. 7 is a diagram showing vibration modes of the bottom surface of the outer case of the ultrasonic transducer according to the third embodiment and the ultrasonic transducer of the comparative example.
- Fig. 7 (A) shows the vibration mode of the bottom surface of the outer case of the ultrasonic transducer with the inner case shown in Fig. 6.
- FIG. 7 (C) shows the vibration mode of the inner bottom surface of the outer case of the ultrasonic transducer (the ultrasonic transducer according to the second embodiment) having the inner case shown in FIG. 3 (A).
- FIGS. 7B and 7D show the effects of the third cutouts 15 (15a, 15b) provided in the support 13 and are shown.
- the range indicated by the ellipse is the approximate position of contact with the ultrasonic vibration acting surface of the inner case, and the arrows S, H, and V indicate the vibration direction of the spurious mode.
- FIGS. 7A and 7B when the third notch 15 is provided in the ridge 13, the third notch of the ridge is shown in FIG. 7B. Since the vibration is absorbed at 15 (since the longitudinal compression and tensile stress is released), the vibrations in the directions of arrows H and V are not so great, and the spurious can be reduced.
- a force S is provided in which the third notches 15a and 15b are provided in each of the prongs 13a and 13b, and a plurality of the third notches may be provided in the prongs.
- the third cutouts 15a and 15b have a shape cut in a direction perpendicular to the major axes of the slats 13a and 13b, and the longitudinal center position of the slats or the center position thereof. It is preferable to provide it at a symmetrical position. Due to this shape, the mass balance centering on the center of the ultrasonic vibration acting surface of the inner case facing the inner bottom surface which is the vibration surface of the outer case can be achieved.
- FIG. 8 (A) is a diagram showing the reverberation characteristics of the ultrasonic transducer according to the third embodiment
- FIG. 8 (B) is the reverberation of the ultrasonic transducer including the inner case shown in FIG. 3 (A).
- FIG. 8 (A) is a diagram showing the reverberation characteristics of the ultrasonic transducer according to the third embodiment
- FIG. 8 (B) is the reverberation of the ultrasonic transducer including the inner case shown in FIG. 3 (A).
- FIG. 8 (B) is the reverberation of the ultrasonic transducer including the inner case shown in FIG. 3 (A).
- the left T1 period is the transmitted wave (driving period), and the vibration during the subsequent Tr period is due to reverberation.
- the vibration during the subsequent T2 period is due to the reflected wave.
- one square on the horizontal axis is 0.1 ms. It can be seen that the reverberation time Tr in Fig. 8 (A) is almost the same as the reverberation time Tr in Fig. 8 (B). As a result, even when the third notches 15a and 15b are formed, reverberation can be suppressed to the same extent as in FIG. 8B.
- FIG. 9 shows an ultrasonic transducer according to the third embodiment
- FIG. 4 is a diagram showing a directivity characteristic of sound pressure of an ultrasonic transducer including the inner case shown in (A).
- Figure 9 (A) shows the sound pressure characteristics in the vertical direction, and 90 and 90 degrees are the major axis directions of the first notch.
- Fig. 9 (B) shows the sound pressure characteristics in the horizontal direction, and 90 and 90 degrees are in the minor axis direction of the first notch.
- the solid line indicates the characteristics of the ultrasonic transducer according to the third embodiment, and the broken line indicates the characteristics of the ultrasonic transducer including the inner case shown in FIG.
- the ultrasonic transducer according to the third embodiment it is possible to further flatten the ultrasonic beam while suppressing reverberation.
- the second notch is provided as a space for the air medium in the same manner as the first notch.
- the second notch and the outer case 1 are provided.
- the space formed between the bottom surface and the outer case 1 and the inner case 2 is filled with a filler having a lower medium density.
- FIG. 10 is a cross-sectional view of an ultrasonic transducer according to the fourth embodiment.
- the inner case 2 is formed with through holes 14a and 14b penetrating the second notches 12a and 12b, respectively.
- a filler is injected from the back side of the inner case 2 through the through holes 14a and 14b, and the second notches 12a and 12b are filled with the filler.
- unnecessary vibrations at the corners of the inner bottom surface of the outer case 1 and the side surfaces of the outer case 1 are absorbed, and the influence of unnecessary vibration mode can be further improved.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020097010856A KR101102223B1 (ko) | 2006-11-27 | 2007-11-22 | 초음파 트랜스듀서 |
JP2008546963A JP4888492B2 (ja) | 2006-11-27 | 2007-11-22 | 超音波トランスデューサ |
EP07832363.1A EP2076061B1 (en) | 2006-11-27 | 2007-11-22 | Ultrasonic transducer |
CN2007800438870A CN101543095B (zh) | 2006-11-27 | 2007-11-22 | 超声波转换器 |
US12/467,361 US7692367B2 (en) | 2006-11-27 | 2009-05-18 | Ultrasonic transducer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-318329 | 2006-11-27 | ||
JP2006318329 | 2006-11-27 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/467,361 Continuation US7692367B2 (en) | 2006-11-27 | 2009-05-18 | Ultrasonic transducer |
Publications (1)
Publication Number | Publication Date |
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WO2008065959A1 true WO2008065959A1 (fr) | 2008-06-05 |
Family
ID=39467751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/072634 WO2008065959A1 (fr) | 2006-11-27 | 2007-11-22 | Transducteur à ultrasons |
Country Status (6)
Country | Link |
---|---|
US (1) | US7692367B2 (ja) |
EP (1) | EP2076061B1 (ja) |
JP (1) | JP4888492B2 (ja) |
KR (1) | KR101102223B1 (ja) |
CN (1) | CN101543095B (ja) |
WO (1) | WO2008065959A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011077918A (ja) * | 2009-09-30 | 2011-04-14 | Murata Mfg Co Ltd | 超音波トランスデューサ |
JP5387697B2 (ja) * | 2010-01-25 | 2014-01-15 | 株式会社村田製作所 | 超音波振動装置 |
JP5447535B2 (ja) * | 2009-12-25 | 2014-03-19 | 株式会社村田製作所 | 超音波振動装置 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008047743A1 (fr) * | 2006-10-20 | 2008-04-24 | Murata Manufacturing Co., Ltd. | capteur ultrasonore |
KR101286768B1 (ko) * | 2009-12-08 | 2013-07-16 | 한국전자통신연구원 | 압전형 스피커 및 그 제조 방법 |
US9105835B2 (en) * | 2010-12-10 | 2015-08-11 | Mitsubishi Electric Corporation | Air-coupled ultrasonic sensor |
CN102075837B (zh) * | 2010-12-22 | 2012-07-04 | 汉得利(常州)电子有限公司 | 一种高频率高灵敏度超声波传感器 |
KR20130013431A (ko) * | 2011-07-28 | 2013-02-06 | 삼성전기주식회사 | 초음파 센서 |
CN103797819B (zh) * | 2011-10-21 | 2016-08-24 | 株式会社村田制作所 | 超声波换能器 |
US10322949B2 (en) * | 2012-03-15 | 2019-06-18 | Flodesign Sonics, Inc. | Transducer and reflector configurations for an acoustophoretic device |
WO2018211589A1 (ja) * | 2017-05-16 | 2018-11-22 | 三菱電機株式会社 | 超音波センサ装置及び障害物検知装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3921016A (en) | 1973-12-12 | 1975-11-18 | Proctor & Assoc Co | Sonic signal generator and housing |
JPS61120600A (ja) | 1984-11-15 | 1986-06-07 | Matsushita Electric Ind Co Ltd | 超音波セラミツクマイクロホン |
JPH11266498A (ja) | 1998-01-13 | 1999-09-28 | Murata Mfg Co Ltd | 超音波センサ、およびその製造方法 |
JP2001013239A (ja) * | 1999-06-30 | 2001-01-19 | Matsushita Electric Works Ltd | 超音波振動子 |
JP2001078296A (ja) * | 1999-08-31 | 2001-03-23 | Matsushita Electric Works Ltd | 超音波振動子 |
JP2002058097A (ja) | 2000-06-02 | 2002-02-22 | Matsushita Electric Works Ltd | 超音波振動子 |
JP2004015150A (ja) | 2002-06-04 | 2004-01-15 | Murata Mfg Co Ltd | 超音波センサ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3821834A (en) * | 1972-07-18 | 1974-07-02 | Automation Ind Inc | Method of making an ultrasonic search unit |
JPS60139399U (ja) | 1984-02-24 | 1985-09-14 | 日本特殊陶業株式会社 | 超音波セラミツクセンサ |
FR2800229B1 (fr) * | 1999-10-22 | 2002-04-05 | Thomson Marconi Sonar Sas | Transducteur acoustique sous-marin a large bande |
JP2001128292A (ja) | 1999-10-28 | 2001-05-11 | Nippon Ceramic Co Ltd | 超音波トランスデューサの製造方法 |
JP2004343660A (ja) | 2003-05-19 | 2004-12-02 | Nippon Ceramic Co Ltd | 超音波センサ |
JP4228997B2 (ja) * | 2004-05-26 | 2009-02-25 | パナソニック電工株式会社 | 超音波センサ |
JP4306561B2 (ja) * | 2004-08-11 | 2009-08-05 | 株式会社デンソー | 超音波センサ |
US7973455B2 (en) | 2005-09-09 | 2011-07-05 | Murata Manufacturing Co., Ltd. | Ultrasonic sensor having stable anisotropy in directional properties |
WO2007069609A1 (ja) * | 2005-12-14 | 2007-06-21 | Murata Manufacturing Co., Ltd. | 超音波トランスデューサ |
WO2008047743A1 (fr) | 2006-10-20 | 2008-04-24 | Murata Manufacturing Co., Ltd. | capteur ultrasonore |
-
2007
- 2007-11-22 EP EP07832363.1A patent/EP2076061B1/en active Active
- 2007-11-22 KR KR1020097010856A patent/KR101102223B1/ko active IP Right Grant
- 2007-11-22 JP JP2008546963A patent/JP4888492B2/ja active Active
- 2007-11-22 WO PCT/JP2007/072634 patent/WO2008065959A1/ja active Application Filing
- 2007-11-22 CN CN2007800438870A patent/CN101543095B/zh active Active
-
2009
- 2009-05-18 US US12/467,361 patent/US7692367B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3921016A (en) | 1973-12-12 | 1975-11-18 | Proctor & Assoc Co | Sonic signal generator and housing |
JPS61120600A (ja) | 1984-11-15 | 1986-06-07 | Matsushita Electric Ind Co Ltd | 超音波セラミツクマイクロホン |
JPH11266498A (ja) | 1998-01-13 | 1999-09-28 | Murata Mfg Co Ltd | 超音波センサ、およびその製造方法 |
JP2001013239A (ja) * | 1999-06-30 | 2001-01-19 | Matsushita Electric Works Ltd | 超音波振動子 |
JP2001078296A (ja) * | 1999-08-31 | 2001-03-23 | Matsushita Electric Works Ltd | 超音波振動子 |
JP2002058097A (ja) | 2000-06-02 | 2002-02-22 | Matsushita Electric Works Ltd | 超音波振動子 |
JP2004015150A (ja) | 2002-06-04 | 2004-01-15 | Murata Mfg Co Ltd | 超音波センサ |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011077918A (ja) * | 2009-09-30 | 2011-04-14 | Murata Mfg Co Ltd | 超音波トランスデューサ |
JP5447535B2 (ja) * | 2009-12-25 | 2014-03-19 | 株式会社村田製作所 | 超音波振動装置 |
KR101422819B1 (ko) | 2009-12-25 | 2014-07-23 | 가부시키가이샤 무라타 세이사쿠쇼 | 초음파 진동장치 |
JP5387697B2 (ja) * | 2010-01-25 | 2014-01-15 | 株式会社村田製作所 | 超音波振動装置 |
Also Published As
Publication number | Publication date |
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EP2076061A1 (en) | 2009-07-01 |
JP4888492B2 (ja) | 2012-02-29 |
US20090218913A1 (en) | 2009-09-03 |
CN101543095A (zh) | 2009-09-23 |
EP2076061A4 (en) | 2011-06-01 |
JPWO2008065959A1 (ja) | 2010-03-04 |
CN101543095B (zh) | 2012-06-13 |
US7692367B2 (en) | 2010-04-06 |
EP2076061B1 (en) | 2019-01-30 |
KR20090075872A (ko) | 2009-07-09 |
KR101102223B1 (ko) | 2012-01-05 |
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