WO2023162276A1 - Émetteur-récepteur ultrasonore - Google Patents

Émetteur-récepteur ultrasonore Download PDF

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Publication number
WO2023162276A1
WO2023162276A1 PCT/JP2022/008471 JP2022008471W WO2023162276A1 WO 2023162276 A1 WO2023162276 A1 WO 2023162276A1 JP 2022008471 W JP2022008471 W JP 2022008471W WO 2023162276 A1 WO2023162276 A1 WO 2023162276A1
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WIPO (PCT)
Prior art keywords
ultrasonic
ultrasonic transducer
transducer
ultrasonic transducers
transducers
Prior art date
Application number
PCT/JP2022/008471
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English (en)
Japanese (ja)
Inventor
賢治 流田
重雄 山本
稔 若林
Original Assignee
本多電子株式会社
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.)
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Application filed by 本多電子株式会社 filed Critical 本多電子株式会社
Priority to JP2023524593A priority Critical patent/JP7365744B1/ja
Priority to PCT/JP2022/008471 priority patent/WO2023162276A1/fr
Publication of WO2023162276A1 publication Critical patent/WO2023162276A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/96—Sonar systems specially adapted for specific applications for locating fish
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • the present invention relates to an ultrasonic transducer having a plurality of ultrasonic transducers for transmitting and receiving ultrasonic waves.
  • scanning sonar is well known as a device for detecting objects to be explored, such as schools of fish, by transmitting and receiving ultrasonic waves.
  • a typical scanning sonar includes an ultrasonic transducer having an ultrasonic transducer that transmits and receives ultrasonic waves, and a driving mechanism that turns and rotates the ultrasonic transducer.
  • ultrasonic waves are transmitted and received while the ultrasonic transmitter/receiver is turned and rotated to explore underwater.
  • JP 2006-105850 A People's Republic of China Patent Publication No. CN-A-109959915
  • the present invention has been made in view of the above problems, and its object is to provide an ultrasonic transducer capable of exploring a wide area in water relatively quickly and having an inexpensive and compact configuration. to provide.
  • the invention according to claim 1 is an ultrasonic transmitter/receiver molded in a state in which a plurality of ultrasonic transducers for transmitting and receiving ultrasonic waves are housed in a case,
  • the plurality of ultrasonic transducers includes one first ultrasonic transducer arranged in the center and five or more and eight or less second ultrasonic transducers arranged at equal intervals around the first ultrasonic transducer.
  • the first ultrasonic transducer has a first acoustic radiation surface and a first center axis orthogonal to the first acoustic radiation surface
  • the second ultrasonic transducer comprises a second It has two acoustic radiation surfaces and a second central axis orthogonal to the second acoustic radiation surface, and the second acoustic radiation surface is inclined such that the second central axis forms an angle with the first central axis.
  • the gist of this is that the second ultrasonic transducer is arranged in a state in which the second ultrasonic transducer is placed.
  • a limited number of second ultrasonic transducers are inclined at regular intervals around the first ultrasonic transducer.
  • the acoustic radiation surfaces of the respective second ultrasonic transducers face different directions by a predetermined angle. Therefore, it is possible to cover a wide underwater exploration area with a limited number of ultrasonic transducers, and a wide area can be explored relatively quickly.
  • the device can be constructed compactly. Furthermore, since the number of channels is small, the configuration for switching control is simplified, and the device can be made inexpensive.
  • the gist of the invention according to claim 2 is that in claim 1, the second central axis forms one angle selected from the range of 20° or more and 40° or less with respect to the first central axis.
  • the invention according to claim 3 is the gist of claim 1 or 2, wherein all of the acoustic radiation surfaces of the plurality of ultrasonic transducers are arranged so as to be positioned on one virtual spherical surface. do.
  • the gist of the invention according to claim 4 is that in any one of claims 1 to 3, a transducer holder is provided for holding the plurality of ultrasonic transducers at predetermined positions and inclinations.
  • the transducer holder has the same number of cup-shaped holders as the ultrasonic transducers, each having a bottom portion and a peripheral wall and holding the ultrasonic transducers.
  • the gist of it is to be prepared.
  • the transducer holder is a resin molded product having a notch in a part of the peripheral wall of the holding portion that holds the second ultrasonic transducer. is the gist of it.
  • the invention according to claim 7 is based on any one of claims 4 to 6, wherein the transducer holder holding the plurality of ultrasonic transducers is molded with a filler while being housed in the case.
  • the filler has a lower specific acoustic impedance than the acoustic matching layer of the ultrasonic transducer, is waterproof, and is filled so that the outer surface is flush with the opening of the case. The gist of this is that the opening of the case is closed.
  • the gist of the invention according to claim 8 is that in any one of claims 1 to 7, the plurality of ultrasonic transducers have the same size and shape.
  • a ninth aspect of the invention is based on any one of the first to eighth aspects, wherein the size of the gap between the adjacent second ultrasonic transducers is 25% or less of the diameter of the ultrasonic transducers.
  • the gist is that the size of the gap between the first ultrasonic transducer and the second ultrasonic transducer is 10% or less of the diameter of the ultrasonic transducer.
  • the invention according to claim 10 is the ultrasonic transducer according to any one of claims 1 to 9, wherein the plurality of ultrasonic transducers has a screw structure that can be attached to the case that also serves as a spacer attachment or to the spacer attachment.
  • the gist of this is that it is housed in the case that has.
  • an ultrasonic transducer capable of surveying a wide area in water relatively quickly and having a low cost and compact configuration. can provide.
  • FIG. 1 is a schematic cross-sectional view showing an ultrasonic transducer of a first embodiment embodying the present invention
  • FIG. 1 is a schematic front view showing an ultrasonic transmitter/receiver according to a first embodiment
  • FIG. FIG. 2 is a cross-sectional view of an ultrasonic transducer that constitutes the ultrasonic transducer of the first embodiment
  • 2 is a front view of an ultrasonic transducer that constitutes the ultrasonic transducer of the first embodiment
  • FIG. 2 is a schematic perspective view showing an arrangement mode of a plurality of ultrasonic transducers in the first embodiment; 4 is a graph showing the relationship between frequency and transmission voltage sensitivity for one ultrasonic transducer used in the first embodiment; 4 is a graph showing directivity characteristics for each frequency of one ultrasonic transducer used in the first embodiment; 5 is a graph showing directivity characteristics of three ultrasonic transducers arranged in different directions, used in the first embodiment; The schematic sectional drawing which shows the ultrasonic transducer of 2nd Embodiment.
  • FIG. 11 is a perspective view of the transducer holder used in the second embodiment, viewed obliquely from above; FIG.
  • FIG. 11 is a perspective view of the transducer holder used in the second embodiment as viewed obliquely from below; The bottom view of the transducer holder used in the second embodiment. The side view of the transducer holder used in the second embodiment.
  • FIG. 4 is a schematic cross-sectional view showing a scraper-mounted ultrasonic transducer in another embodiment.
  • FIG. 4 is a schematic cross-sectional view showing a scraper-mounted ultrasonic transducer in another embodiment.
  • FIG. 11 is a schematic perspective view showing another embodiment in which five second ultrasonic transducers are arranged;
  • FIG. 11 is a schematic perspective view showing another embodiment in which eight second ultrasonic transducers are arranged;
  • FIG. 4 is a schematic perspective view showing a comparative example in which four second ultrasonic transducers are arranged;
  • FIG. 1 A first embodiment in which the present invention is embodied in an ultrasonic transducer 11 used in a scanning sonar will be described in detail below with reference to FIGS. 1 to 8.
  • FIG. 1 A first embodiment in which the present invention is embodied in an ultrasonic transducer 11 used in a scanning sonar will be described in detail below with reference to FIGS. 1 to 8.
  • FIG. 1 A first embodiment in which the present invention is embodied in an ultrasonic transducer 11 used in a scanning sonar will be described in detail below with reference to FIGS. 1 to 8.
  • FIG. 1 is a schematic cross-sectional view showing an ultrasonic transducer 11 of this embodiment, and FIG. 2 is a schematic front view thereof.
  • a scanning sonar is a device for exploring underwater objects such as schools of fish by irradiating ultrasonic waves into the water.
  • the scanning sonar of this embodiment basically includes an ultrasonic transmitter/receiver 11, as well as an elevating device, a display device, a control device, and the like (all not shown).
  • the ultrasonic transducer 11 is attached to an elevating device so as to be used while being placed on the bottom of a ship.
  • the elevating device immerses the ultrasonic transducer 11 in water by raising and lowering the ultrasonic transducer 11 .
  • the display device is installed in the steering room of the ship and has an operation section and a display section.
  • a controller is also located in the ship's wheelhouse and is electrically connected to the display and controller.
  • This control device drives and controls the ultrasonic transmitter/receiver 11 according to a predetermined program to transmit and receive ultrasonic waves.
  • the control device also drives and controls the display device according to a predetermined program to display the result of underwater exploration as an ultrasonic image.
  • the ultrasonic transducer 11 of this embodiment has a structure in which a plurality of ultrasonic transducers 31 for transmitting and receiving ultrasonic waves are housed in a case 21 and molded.
  • FIG. 3 is a cross-sectional view of an ultrasonic transducer 31 constituting the ultrasonic transducer 11, and
  • FIG. 4 is a front view thereof.
  • FIG. 5 is a schematic perspective view showing how the plurality of ultrasonic transducers 31 are arranged.
  • the plurality of ultrasonic transducers 31 used in this embodiment are disc-shaped structures having the same size and shape.
  • Each ultrasonic transducer 31 has a substrate 32 and a piezoelectric element 33 .
  • the base material 32 is a disk-shaped resin plate material that also serves as an acoustic matching layer, and in this embodiment, a base material made of glass epoxy is used.
  • the piezoelectric element 33 is a plate-like object made of piezoelectric ceramics, and in this embodiment, a disk-like plate-like object formed using lead zirconate titanate (PZT) is used.
  • the piezoelectric element 33 has a front surface 41 bonded to the substrate 32 , a back surface 42 opposite the front surface 41 , and an outer peripheral surface 43 orthogonal to the front surface 41 and back surface 42 .
  • a front-side electrode 44 is formed on the front surface 41 of the piezoelectric element 33
  • a back-side electrode 45 is formed on the back surface 42 of the piezoelectric element 33 .
  • the entire front surface 41 of the piezoelectric element 33 is bonded to the substrate 32 via the front-side electrode 44 and an adhesive layer (not shown).
  • the piezoelectric element 33 is divided by grooves 52 that are parallel to each other in plan view, and has a structure including a plurality of substantially strip-shaped vibrating portions 51 .
  • This structure is advantageous in realizing a wideband vibrator with a fractional bandwidth of 0.2 or more, which will be described later.
  • the depth of the groove 52 is not particularly limited and is arbitrary, it is set to about 80% to 95% of the thickness of the piezoelectric element 33, for example.
  • the plurality of grooves 52 are linear and do not cross each other, and are formed parallel to each other in this embodiment.
  • the interval between the grooves 52 is not particularly limited and is arbitrary. By setting the interval between the grooves 52 within this range, the piezoelectric element 33 can be easily deformed in the thickness direction, and the electromechanical coupling coefficient can be increased.
  • the number of divisions of the piezoelectric element 33 (that is, the number of vibrating portions 51) is not particularly limited and can be arbitrarily set, but is, for example, about 4 to 10, and is set to 5 in this embodiment.
  • the length of the vibrating portion 51 located in the central portion is the longest
  • the length of the vibrating portions 51 located on both sides thereof is the second longest
  • the length of the vibrating portions 51 located on the outer side is the longest. is the shortest.
  • the width of the vibrating portions 51 the width of the vibrating portion 51 located on the outermost side is larger than the width of the other portions.
  • the five vibrating portions 51 are connected to each other at the end portion of the piezoelectric element 33 on the front surface 41 side.
  • each vibrating portion 51 is greater than the height, and the height is greater than the width. Also, the thickness of the base material 32 is smaller than the height of the vibrating portion 51 . Also, the thickness of the portion of the piezoelectric element 33 where the vibrating portions 51 are connected is considerably thinner than the thickness of the piezoelectric element 33 and the base material 32 . For example, in the present embodiment, the thickness of the connection portion is about 5% to 20% of the thickness of the base material 32 .
  • the back side electrode 45 on the back side 42 of the piezoelectric element 33 is formed so as to bridge the surfaces of the five vibrating portions 51 .
  • a conductive metal foil made of a metal material with low electrical resistance such as copper, silver, or tin is used as the back side electrode 45 .
  • a first lead wire 61 is electrically connected to the front electrode 44 and a second lead wire 62 is electrically connected to the rear electrode 45, as shown in FIG.
  • These lead wires 61 and 62 are housed and bundled in one wiring cable 64 .
  • the wiring cable 64 is drawn out of the case 21 through a wiring insertion hole 29 provided in the upper portion of the case 21 .
  • a sheet-like soundproof material 47 (backing material) made of sponge or the like is attached to the back surface 42 side of the piezoelectric element 33 in order to suppress the reverberation of the ultrasonic waves.
  • the case 21 is made of a resin material such as ABS resin, and has a bottomed cylindrical shape with an opening 22 at one end.
  • a plurality of ultrasonic transducers 31 are accommodated in the case 21 .
  • the plurality of ultrasonic transducers 31 includes one first ultrasonic transducer 31A arranged in the center and five ultrasonic transducers arranged at equal intervals around the first ultrasonic transducer 31A. It consists of eight or less second ultrasonic transducers 31B. In this embodiment, the number of second ultrasonic transducers 31B is six.
  • the acoustic radiation surface 34A of the first ultrasonic transducer 31A and the acoustic radiation surface 34B of each of the second ultrasonic transducers 31B are all located on one virtual spherical surface.
  • the direction of the first central axis C1 orthogonal to the center of the acoustic radiation surface 34A (also referred to as the direction of the normal vector of the first ultrasonic transducer 31A) is , can be grasped as the acoustic radiation direction.
  • the direction of the second central axis C2 perpendicular to the center of the acoustic radiation surface 34B (also referred to as the direction of the normal vector of the second ultrasonic transducer 31B) is It can be grasped as the acoustic radiation direction.
  • the second acoustic radiation surface 34B is tilted so that the second central axis C2 forms an angle ⁇ with respect to the first central axis C1, and each 2 ultrasonic transducers 31B are arranged. That is, the acoustic radiation direction of the first ultrasonic transducer 31A faces the same direction as the axial direction of the case 21 (downward in FIG. 1). On the other hand, the acoustic radiation direction of each of the second ultrasonic transducers 31B faces a direction different from the axial direction of the case 21 .
  • each of the second ultrasonic transducers 31B of this embodiment has its acoustic radiation surface 34B directed inward (in other words, toward the side where the first ultrasonic transducer 31A is located). ) in an oblique arrangement (see FIGS. 1 and 5).
  • the second central axis C2 preferably forms one angle ⁇ selected from the range of 20° or more and 40° or less with respect to the first central axis C1. 30°.
  • each of the second central axis C2 and the first central axis C1 is converged at one point.
  • the second central axes C2 of the adjacent second ultrasonic transducers 31B also form one angle ⁇ (here, about 30°) selected from the range of 20° or more and 40° or less.
  • the size of the gap between the adjacent second ultrasonic transducers 31B is set to, for example, 25% or less of the diameter of the ultrasonic transducers 31, and is set to 5% or less in this embodiment. That is, the adjacent second ultrasonic transducers 31B are arranged with almost no gap. Also, the size of the gap between the first ultrasonic transducer 31A and the second ultrasonic transducer 31B is set to, for example, 10% or less of the diameter of the ultrasonic transducer 31, and is set to 5% or less in this embodiment. It is That is, the first ultrasonic transducer 31A and the second ultrasonic transducer 31B are also arranged with almost no gap between them.
  • the seven ultrasonic transducers 31 densely arranged as described above are housed in the case 21 and molded with the filler 26.
  • a waterproof resin material such as urethane resin
  • the outer surface of the filler 26 is filled so as to be flush with the opening 22 of the case 21 , thereby closing the opening 22 of the case 21 .
  • the controller is driven to cause the ultrasonic transmitter/receiver 11 to transmit and receive ultrasonic waves. That is, control is performed to output an oscillation signal to each ultrasonic transducer 31 to drive the ultrasonic transducers 31 .
  • each vibrating portion 51 of the piezoelectric element 33 repeats contraction and expansion. When the vibrating portion 51 shrinks in the height direction, the vibrating portion 51 expands slightly in the width direction. As a result, the piezoelectric element 33 vibrates, and ultrasonic waves are emitted (transmitted) from the ultrasonic transducer 31 to the water.
  • a reflected ultrasonic wave that has reached the object to be investigated is input (received) to each ultrasonic transducer 31 of the ultrasonic transducer 11 .
  • the control device converts the reflected ultrasonic wave received by each ultrasonic transducer 31 into a received signal, takes in the received signal, and performs predetermined arithmetic processing based on the received signal. Then, the control device causes the display device to display the results of underwater exploration obtained by the arithmetic processing. More specifically, by controlling the driving timing of each ultrasonic transducer 31 and performing transmission and reception, the results of underwater exploration in each direction are imaged from the information of each received signal and displayed on the display device. .
  • a scanning sonar equipped with the ultrasonic transducer 11 of this embodiment can be an effective means for finding the moving direction of a school of fish or the like.
  • FIG. 6 is a graph showing the relationship between frequency and transmission voltage sensitivity for one ultrasonic transducer 31.
  • FIG. 7 is a graph showing directivity characteristics for each frequency for one ultrasonic transducer 31.
  • FIG. 8 is a graph showing directivity characteristics of three ultrasonic transducers 31 arranged in different directions.
  • an ultrasonic transducer having basically the same configuration as the ultrasonic transducer 31 of the present embodiment was prepared (see FIG. 4, etc.).
  • the diameter of the ultrasonic transducer 31 is set to 25 mm ⁇
  • the thickness of the piezoelectric element 33 is set to 9 mm
  • the thickness of the substrate 32 is set to 4 mm.
  • the piezoelectric element 33 has four grooves 52 with a depth of 8.5 mm, and the thickness of the portion of the piezoelectric element 33 where the vibrating parts 51 are connected to each other is 0.5 mm.
  • the ultrasonic transducer 31 which is a sample for measurement, is driven to irradiate (transmit) ultrasonic waves.
  • the voltage amplitude at that time was measured with an oscilloscope to calculate the transmitted wave voltage sensitivity.
  • the frequency was switched in a plurality of steps between 40 kHz and 260 kHz, and ultrasonic waves were transmitted at each switched frequency.
  • the transmission voltage sensitivity (dB) of the ultrasonic transducer 31 was calculated.
  • the peaks of the transmitted wave voltage sensitivity appeared at two positions centered around 60 kHz and 160 kHz.
  • the peak vibration appearing near 160 kHz was thickness direction vibration
  • the peak vibration appearing near 60 kHz was radial direction vibration.
  • the transmission voltage sensitivity of 145 dB is used as a reference in the graph of FIG. 6, this value was exceeded in the frequency range of approximately 50 kHz to 70 kHz and in the frequency range of approximately 120 kHz to 250 kHz.
  • the ultrasonic transducer 31 of the present embodiment is a broadband transducer that can be used in the above-described lower frequency range in which it vibrates by thickness-direction vibration and in the above-described upper frequency range in which it vibrates by radial-direction vibration. concluded.
  • the ultrasonic transducer 31 constituting the ultrasonic transducer 11 used for scanning sonar it is considered desirable to use a wideband transducer with a fractional bandwidth of 0.2 or more, in which chirp driving is effective.
  • the relative bandwidth of this ultrasonic transducer 31 was obtained, it was found to be 0.2 or more, so it can be said that it has favorable characteristics.
  • the directional characteristics of the ultrasonic transducer 31 were verified. Specifically, ultrasonic waves were emitted from one ultrasonic transducer 31, which is a sample for measurement, and the transmitted sound pressure during irradiation (during transmission) was measured. At this time, the tilt angle (tilt angle) of the ultrasonic transducer 31 was changed in a plurality of steps between 0° and 90°, ultrasonic waves were emitted at each of the changed tilt angles, and the transmitted sound pressure was measured.
  • the tilt angle is 0° when the acoustic radiation surface (back surface of the base material 32) faces downward in the vertical direction
  • the tilt angle is 90° when the acoustic radiation surface faces sideways. .
  • the frequency of ultrasonic waves was switched to 65 kHz, 140 kHz, 180 kHz, and 240 kHz, ultrasonic waves were irradiated at each switched frequency, and transmitted sound pressure was measured. The results are shown in the graph of FIG.
  • the ultrasonic transducer 31 of this embodiment has ideal directional characteristics when applied to the ultrasonic transducer 11 used for scanning sonar. Further, when the half-life full angle of this ultrasonic transducer 31 was actually measured, it was 19° to 26° at each frequency.
  • ultrasonic transducers 31 were used in combination. Specifically, three ultrasonic transducers 31, which are measurement samples, were arranged side by side with each tilt of 30°. Ultrasonic waves of 140 kHz were irradiated from these three ultrasonic transducers 31, and the transmitted sound pressure during irradiation (during transmission) was measured by the same method as described above. The results are shown in the graph of FIG.
  • the ultrasonic beams of each ultrasonic transducer 31 were ideal without large side lobes. Also, when the three ultrasonic transducers 31 are arranged with an inclination of 30° each, the three main lobes are oriented with a deviation of 30°. Therefore, it has been found that the ultrasonic beams of the three ultrasonic transducers 31 can cover a relatively wide range of approximately 90 degrees.
  • the ultrasonic transmitter/receiver 11 of this embodiment includes one first ultrasonic transducer 31A arranged in the center and six second ultrasonic transducers 31B arranged at equal intervals around it. and Each of the second ultrasonic transducers 31B is arranged with the second acoustic radiation surface 34B inclined such that the second central axis C2 forms an angle ⁇ with respect to the first central axis C1. In other words, a limited number of second ultrasonic transducers 31B are inclined at regular intervals around the first ultrasonic transducer 31A. By arranging in this manner, the second acoustic radiation surfaces 34B of the respective second ultrasonic transducers 31B face different directions by a predetermined angle (approximately 30°).
  • the resonance frequency in order to widen the directivity angle of the ultrasonic transducer 31 constituting the ultrasonic transmitter/receiver 11, the resonance frequency should be low, but for that purpose the resonance length of the ultrasonic transducer 31 must be lengthened. In this case, it is necessary to increase the thickness or diameter of the piezoelectric element 33, which hinders the downsizing of the entire device. On the other hand, there is a demand to make the overall size of the ultrasonic transducer 11 as compact as possible in order to keep costs down. In this regard, according to the present embodiment, it is possible to solve the above two contradictory problems.
  • the angle ⁇ of the second central axis C2 with respect to the first central axis C1 is selected from the range of 20° to 40° (30° in the present embodiment) °).
  • a plurality of ultrasonic transducers 31 are housed in the case 21 and molded with the filler 26 .
  • the filler 26 has a lower specific acoustic impedance than the base material 32, which is the acoustic matching layer of the ultrasonic transducer 31, and is waterproof.
  • the filler 26 is filled so that the outer surface of the case 21 is flush with the opening 22 of the case 21 to close the opening 22 . Therefore, the plurality of ultrasonic transducers 31 are embedded in the filler 26 and become invisible, thereby protecting the plurality of ultrasonic transducers 31 and improving the waterproofness.
  • the opening 22 side of the case 21 is an ultrasonic wave emitting surface without unevenness, the appearance is less complicated and the resistance in water is reduced.
  • the plurality of ultrasonic transducers 31 have the same size and shape. Therefore, since the sensitivity characteristics of the plurality of ultrasonic transducers 31 can be made uniform, the ultrasonic transmitter/receiver 11 can have excellent measurement accuracy.
  • the size of the gap between the adjacent second ultrasonic transducers 31B is 25% or less of the diameter of the ultrasonic transducers 31 .
  • the size of the gap between the first ultrasonic transducer 31A and the second ultrasonic transducer 31B is 10% or less of the diameter of the ultrasonic transducer 31 .
  • FIG. 9 is a schematic cross-sectional view showing the ultrasonic transducer 11A.
  • FIG. 10 is a perspective view of the vibrator holder 71 viewed obliquely from above
  • FIG. 11 is a perspective view of the vibrator holder 71 viewed obliquely from below
  • FIG. 12 is a bottom view
  • FIG. 13 is a side view.
  • This ultrasonic transmitter/receiver 11A is different from that of the first embodiment in that it has a transducer holder 71 as a fixing base for holding a plurality of ultrasonic transducers 31 at predetermined positions and inclinations.
  • the vibrator holder 71 is a resin molded product including a main body 76 and a plurality of holding portions 72 .
  • the number of holding portions 72 is seven in total, one in the central portion and six in the peripheral portion. That is, the transducer holder 71 has the same number of holding portions 72 as the seven ultrasonic transducers 31 .
  • the main body 76 is a member composed of a plurality of connecting portions 78 and supports a plurality of holding portions 72 .
  • a plurality of connecting portions 78 connect adjacent holding portions 72 to each other.
  • a region between the plurality of connecting portions 78 serves as a through hole 79 that communicates the main body 76 in the vertical direction.
  • Each holding part 72 is a circular cup-shaped part having a bottom part 73 and a peripheral wall 74 in plan view.
  • One holding portion 72 positioned at the center of the transducer holder 71 is a holding portion for holding the first ultrasonic transducer 31A.
  • Six holding portions 72 located in the peripheral portion of the transducer holder 71 are holding portions for holding the second ultrasonic transducer 31B.
  • the six holding portions 72 located in the peripheral portion are inclined by about 30° with respect to the holding portion 72 located in the central portion.
  • the six holding portions 72 located in the peripheral portion have a notch portion 75 in a part of the peripheral wall 74 in order to facilitate removal of the mold during resin molding.
  • the notch 75 is positioned at the outermost periphery of the vibrator holder 71 over about half the circumference of the peripheral wall 74 .
  • the holding part 72 located in the central part does not have the notch 75 in a part of the peripheral wall 74 and has a perfect shape.
  • a wiring hole 77 communicating with the front and back surfaces of the bottom portion 73 is formed in the bottom portion 73 of each holding portion 72 .
  • a first lead wire 61 and a second lead wire 62 drawn out from the ultrasonic transducer 31 are respectively inserted through these wiring holes 77 .
  • the ultrasonic transducer 11A of this embodiment is assembled in the following procedure.
  • the transducer holder 71 is prepared, the central holding portion 72 holds the first ultrasonic transducer 31A, and the six peripheral holding portions 72 hold the second ultrasonic transducer 31B.
  • the first ultrasonic transducer 31A and the second ultrasonic transducer 31B may be bonded to the inner surface of the holding portion 72 using an adhesive or the like.
  • a soundproof material (not shown) may be arranged on the back side of the first ultrasonic transducer 31A and the second ultrasonic transducer 31B.
  • the transducer holder 71 holding the ultrasonic transducer 31 is housed in the case 21 and positioned.
  • the sound radiation direction of the first ultrasonic transducer 31A is adjusted so as to be the same as the axial direction of the case 21 .
  • a portion of the transducer holder 71 may be brought into contact with the inner surface of the case 21 for positioning.
  • a plurality of pillars (not shown) are protruded from the main body 76 of the vibrator holder 71 .
  • reliable positioning may be achieved.
  • the transducer holder 71 holding the plurality of ultrasonic transducers 31 is enclosed in the case 21, and the assembly of the ultrasonic transducer 11A is completed. do.
  • the ultrasonic transducer 11A of this embodiment has the following effects in addition to the effects mentioned in the first embodiment.
  • the ultrasonic transducer 11A of this embodiment includes a transducer holder 71 that holds a plurality of ultrasonic transducers 31 at predetermined correct positions and inclinations. Therefore, the one first ultrasonic transducer 31A and the six second ultrasonic transducers 31B are easily and reliably held at the correct predetermined positions and inclinations. In addition, by using such a transducer holder 71, troublesome work for positioning the ultrasonic transducers 31 to each other becomes unnecessary. Therefore, the ultrasonic transmitter/receiver 11A can be of high quality and easy to manufacture.
  • the transducer holder 71 of the ultrasonic transducer 11A of this embodiment has a bottom portion 73 and a peripheral wall 74, and a cup-shaped holding portion 72 for holding the ultrasonic transducer 31. and the same number (here, seven). Therefore, each ultrasonic transducer 31 is stably supported by the transducer holder 71 at the correct position and angle by holding each ultrasonic transducer 31 in the cup-shaped holders 72 which are the same in number as the ultrasonic transducers 31 . can be made
  • the transducer holder 71 of the ultrasonic transducer 11A of this embodiment is a resin molded product having a notch 75 in a part of the peripheral wall 74 of the holding portion 72 that holds the second ultrasonic transducer 31B. . All of the holding portions 72 that hold the second ultrasonic transducer 31B are inclined. Therefore, it is expected that it will be difficult to remove the mold when producing a resin molded product by mold molding. In this regard, in the vibrator holder 71, a portion of the peripheral wall of the holding portion 72 (a portion difficult to remove from the mold) is cut out, so that the removal from the mold can be easily performed. Therefore, the ultrasonic transmitter/receiver 11A can be easily manufactured.
  • the transducer holder 71 of the ultrasonic transducer 11A of the present embodiment is molded with the filler 26 while being housed in the case 21 .
  • the filler 26 has a lower specific acoustic impedance than the base material 32, which also serves as an acoustic matching layer of the ultrasonic transducer 31, and is waterproof. Further, the filler 26 closes the opening 22 by being filled so that the outer surface thereof is flush with the opening 22 of the case 21 . Therefore, the plurality of ultrasonic transducers 31 and the transducer holder 71 are embedded in the filler 26 and become invisible. As a result, they are protected and waterproof is improved. In addition, since the opening 22 side of the case 21 is an ultrasonic wave emitting surface without irregularities, the appearance is less complicated and resistance in water can be reduced.
  • an ultrasonic transducer 11B of another embodiment shown in FIG. 14 may be used.
  • the ultrasonic transmitter/receiver 11B is a scraper-mounted ultrasonic transmitter/receiver, and has a structure that can be attached to a drainage hole (skipper hole) 81 provided in the bottom 80 of the ship.
  • a cylindrical spacer fitting is normally fitted into the spacer hole 81 .
  • the scupper fitting is secured with a nut and its top opening is capped.
  • the case 21A itself has a structure similar to that of a cylindrical scraper fitting, and also serves as the scraper fitting.
  • a flange portion 86 and a male screw groove portion 85 are provided on the outer peripheral surface of the case 21A that also serves as a spacer attachment.
  • the case 21B is fitted into the spacer hole 81, and the case 21A is fixed to the spacer hole 81 by screwing the female threaded portion 87 of the nut 83 into the male threaded groove portion 85 in this state. Therefore, this ultrasonic transmitter/receiver 11B can also be easily and watertightly attached to the ship bottom 80 using the existing scraper hole 81 .
  • an ultrasonic transmitter/receiver 11C of another embodiment shown in FIG. 15 may be used.
  • This ultrasonic transmitter/receiver 11C is also a scupper-mounted ultrasonic transmitter/receiver.
  • a case 21B that constitutes the ultrasonic transmitter/receiver 11C has a threaded structure that can be attached to a scupper fixture 82 installed on the bottom 80 of the ship.
  • the inner peripheral surface of the spacer mounting member 82 is provided with a female thread groove portion 82a, and the outer peripheral surface thereof is provided with a male thread groove portion 82b.
  • a female screw portion 84 screwed into the male screw groove portion 82a is provided on the entire outer peripheral surface of the case 21B.
  • the female screw groove portion 82a and the female screw portion 84 are screwed together to fix the case 21B to the scupper hole 81 via the scupper fitting 82.
  • the ultrasonic transmitter/receiver 11C can be easily and watertightly attached to the ship bottom 80 using the existing scraper hole 81.
  • the ultrasonic transducer 11B of FIG. 14 described above needs to be attached from the outside of the bottom 80 of the ship.
  • the ultrasonic transmitter/receiver 11B has an advantage in that the existing scupper hole 81 can be used as it is without being subjected to diameter-enlarging processing.
  • the ultrasonic transmitter/receiver 11C of FIG. 15 requires the existing scraper hole 81 to be slightly enlarged for attachment, or the ultrasonic transducer 31 to be slightly reduced.
  • the ultrasonic transmitter/receiver 11C has the advantage that it can be attached to the existing scupper hole 81 from the inside of the ship bottom 80 .
  • the present invention is not limited to this.
  • five second ultrasonic transducers 31B may be arranged at equal intervals around one first ultrasonic transducer 31A.
  • the inclination of the normal vector of the second ultrasonic transducer 31B with respect to the normal vector of the first ultrasonic transducer 31A is set at 30°, for example.
  • the inclination of the normal vector between the adjacent second ultrasonic transducers 31B is set to 34°, for example.
  • the ultrasonic beam can cover a relatively wide range of 94°.
  • the inclination of the normal vector of the second ultrasonic transducer 31B with respect to the normal vector of the first ultrasonic transducer 31A is set to 34°, for example.
  • the inclination of the normal vector between the adjacent second ultrasonic transducers 31B is set to 39°, for example. In this case, if the half-life angle of each ultrasonic transducer 31 is 40° or more, the ultrasonic beam can cover a relatively wide range of 108°.
  • восем ⁇ second ultrasonic transducers 31B may be arranged at equal intervals around one first ultrasonic transducer 31A.
  • the inclination of the normal vector of the second ultrasonic transducer 31B with respect to the normal vector of the first ultrasonic transducer 31A is set at 30°, for example.
  • the inclination of the normal vector between the adjacent second ultrasonic transducers 31B is set to 22°, for example.
  • a relatively wide range equivalent to that of the above embodiment and FIG. 16 can be covered with ultrasonic beams.
  • the number of the second ultrasonic transducers 31B is preferably seven or less, more preferably six or less.
  • the adjacent second ultrasonic transducers 31B cannot be arranged close to each other and densely, resulting in a large gap between them.
  • the inclination of the normal vector of the second ultrasonic transducer 31B with respect to the normal vector of the first ultrasonic transducer 31A is set to 34°, for example.
  • the inclination of the normal vector between the adjacent second ultrasonic transducers 31B is set to 46.5°, for example.
  • the ultrasonic beam has a dead angle, which is not preferable. Therefore, it is necessary to set the half-life angle of each ultrasonic transducer 31 to 40° or more.
  • the transducer holder 71 having the structure as shown in FIGS. 10 to 13 is used, but the present invention is not limited to this.
  • the vibrator holder 71 instead of omitting the sound absorbing material, the vibrator holder 71 itself may be given a function as a sound absorbing material.
  • the transducer holder 71 may be produced by a method other than the mold molding method (for example, 3D printing, etc.), or may be produced using a material other than resin (for example, metal, etc.).
  • the plurality of ultrasonic transducers 31 are assumed to have the same size and shape, but the present invention is not limited to this.
  • the sizes may differ, or the shapes may of course differ.
  • all the acoustic radiation surfaces of the plurality of ultrasonic transducers 31 are arranged on one virtual spherical surface.
  • a structure that is not on the spherical surface may be adopted.
  • the second ultrasonic transducers 31B are arranged with the acoustic radiation surfaces 34B facing inward (in other words, toward the side where the first ultrasonic transducer 31A is located). However, it is not limited to this. Conversely, each of the second ultrasonic transducers 31B is inclined so that the acoustic radiation surface 34B of each other faces outward (in other words, toward the side without the first ultrasonic transducer 31A).
  • the piezoelectric element 33 is divided by the grooves 52 that are parallel to each other in a plan view, and has a structure including a plurality of substantially strip-shaped vibrating parts 51, but is not limited to this.
  • the piezoelectric element 33 may be divided by a plurality of radial grooves 52 in plan view.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

L'invention concerne un émetteur-récepteur ultrasonore compact et peu coûteux qui peut rechercher relativement rapidement une large zone sous-marine. Cet émetteur-récepteur ultrasonore (11) est formé par moulage d'une pluralité de transducteurs ultrasonores (31) qui émettent et reçoivent des ondes ultrasonores à l'intérieur d'un boîtier (21). La pluralité de transducteurs ultrasonores (31) comprennent un premier transducteur ultrasonore (31A) qui est disposé dans le centre et 5 à 8 seconds transducteurs ultrasonores (31B) qui sont disposés autour du premier transducteur ultrasonore (31A) à des intervalles égaux. Des secondes surfaces d'émission acoustique (34B) des seconds transducteurs ultrasonores (31B) sont inclinées de telle sorte que des seconds axes centraux C2 des seconds transducteurs Ultrasonores (31B) sont à un angle θ par rapport à un premier axe central C1 du premier transducteur ultrasonore (31A).
PCT/JP2022/008471 2022-02-28 2022-02-28 Émetteur-récepteur ultrasonore WO2023162276A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023524593A JP7365744B1 (ja) 2022-02-28 2022-02-28 超音波送受波器
PCT/JP2022/008471 WO2023162276A1 (fr) 2022-02-28 2022-02-28 Émetteur-récepteur ultrasonore

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/008471 WO2023162276A1 (fr) 2022-02-28 2022-02-28 Émetteur-récepteur ultrasonore

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58162070U (ja) * 1982-04-22 1983-10-28 井澗　順 音響探知用送受波器取付構造
JPS61146098A (ja) * 1984-12-20 1986-07-03 Matsushita Electric Ind Co Ltd 複合型超音波送受波器
JPH0772240A (ja) * 1993-06-15 1995-03-17 Japan Radio Co Ltd 超音波受波器
JPH10186030A (ja) * 1996-10-31 1998-07-14 Koden Electron Co Ltd 方向検出可能魚群探知機
CN101726740A (zh) * 2009-11-12 2010-06-09 中国水产科学研究院渔业机械仪器研究所 网箱养鱼生物量评估超声波监测装置
JP2014016275A (ja) * 2012-07-10 2014-01-30 Furuno Electric Co Ltd 取付構造、及び取付部材
US20170016989A1 (en) * 2015-06-22 2017-01-19 Appetite Lab Inc. Devices and methods for locating and visualizing underwater objects

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58162070U (ja) * 1982-04-22 1983-10-28 井澗　順 音響探知用送受波器取付構造
JPS61146098A (ja) * 1984-12-20 1986-07-03 Matsushita Electric Ind Co Ltd 複合型超音波送受波器
JPH0772240A (ja) * 1993-06-15 1995-03-17 Japan Radio Co Ltd 超音波受波器
JPH10186030A (ja) * 1996-10-31 1998-07-14 Koden Electron Co Ltd 方向検出可能魚群探知機
CN101726740A (zh) * 2009-11-12 2010-06-09 中国水产科学研究院渔业机械仪器研究所 网箱养鱼生物量评估超声波监测装置
JP2014016275A (ja) * 2012-07-10 2014-01-30 Furuno Electric Co Ltd 取付構造、及び取付部材
US20170016989A1 (en) * 2015-06-22 2017-01-19 Appetite Lab Inc. Devices and methods for locating and visualizing underwater objects

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JP7365744B1 (ja) 2023-10-20

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