Acoustic transmission-reception device and construction method for acoustic transmission-reception device

Abstract

To provide an acoustic transmission-reception device in which a front mass is easily processed, and a construction method for an acoustic transmission-reception device.SOLUTION: An acoustic transmission-reception device includes: a driving element having a first end and a second end; a front mass having a hole on a side surface and connected to the first end of the driving element; and a rear mass connected to the second end of the driving element. The hole extends inward from a side of the front mass.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present disclosure relates to an acoustic wave transmitting and receiving device and a method for constructing an acoustic wave transmitting and receiving device. [Background technology]

[0002] 2. Description of the Related Art Known acoustic wave transmitting and receiving devices include an acoustic wave transmitting and receiving device that includes a front mass.

[0003] As this type of acoustic wave transmitting and receiving device, Patent Document 1 discloses a bolt-clamped Langevin type wave transmitting and receiving device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-20018 Summary of the Invention [Problem to be solved by the invention]

[0005] In the transducer disclosed in Patent Document 1, a slit is provided on the circumference of the front mass of the Langevin type vibrator on the lower side of the rear mass side, which communicates from the outer peripheral side to the axial center side. However, in the case of a transducer such as that disclosed in Patent Document 1, it is sometimes difficult to form a slit in the front mass. For this reason, processing the front mass can be difficult.

[0006] An object of the present disclosure is to provide an acoustic wave transmitting and receiving device and a method for constructing an acoustic wave transmitting and receiving device that solves the above-mentioned problems. [Means for solving the problem]

[0007] An acoustic wave transmitting and receiving device according to one aspect of the present disclosure comprises a driving element having a first end and a second end, a front mass having a hole on a side surface and connected to the first end of the driving element, and a rear mass connected to the second end of the driving element, the hole extending from the side surface of the front mass into the interior of the front mass.

[0008] A method for constructing an acoustic wave transmitting and receiving device according to one aspect of the present disclosure includes forming a hole extending from a side surface of a front mass to the interior thereof, placing the front mass at a first end of a driving element, and placing a rear mass at a second end of the driving element. [Effects of the Invention]

[0009] According to the above aspect, the front mass can be easily processed. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 2] FIG. 2 is a side view of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 1 is a front view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 5] FIG. 5 is a side view of FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] 1 is a front view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 8] 1 is a front view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 9] 1 is a front view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 10] 1 is a front view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 11] FIG. 11 is a side view of FIG. [Figure 12] 1 is a side view of an acoustic wave transmitting and receiving device according to the present disclosure. [Figure 13]1 is a flowchart illustrating steps in a method for constructing an acoustic wave transmitting and receiving device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Each embodiment will be described below with reference to the drawings. In all drawings, the same or corresponding components are designated by the same reference numerals, and common descriptions will be omitted. It should be noted that in this disclosure, the drawings may relate to one or more embodiments.

[0012] First Embodiment An acoustic wave transmitting and receiving device according to the present disclosure will be described below with reference to FIGS. 1 to 3 are schematic diagrams of an acoustic wave transmitting and receiving device 1 according to the present invention, in which FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

[0013] As shown in FIG. 2, this acoustic wave transmitting and receiving device 1 has a driving element 2 which is a Langevin type wave transmitting and receiving element. The driving element 2 has a first end 2A and a second end 2B, with a front mass 3 connected to the first end 2A and a rear mass 4 connected to the second end 2B. The driving element 2 is a cylindrical piezoelectric element 5 made of PZT (Lead Titanate Zirconate) or the like, with electrodes 2C on both ends, and is driven by an AC voltage supplied from a driving circuit (not shown). The driving element 2 is configured such that a plurality of cylindrical piezoelectric elements 5 are connected along a central axis O.

[0014] The front mass 3 is made of a lightweight material such as an aluminum alloy. The rear mass 4 is made of a high density material such as steel. As shown in FIG. 3, the front mass 3 and rear mass 4 are connected to the cylindrical driving element 2 by tightening bolts 6 that pass through the driving element 2 . When the bolts 6 that connect the front mass 3 and the rear mass 4 are tightened, compressive stress is applied to the drive element 2 from both sides, causing vibrations of a predetermined frequency.

[0015] As shown in Figure 1, the front mass 3 is rectangular when viewed from the front (the left side in Figure 2 along the central axis O of the drive element 2), and has a hole 10 that runs from one side, side 7, to the opposite side. The hole 10 extends in the front mass 3 in a direction perpendicular to the central axis O of the drive element 2, with the hole 10 being an opening having a certain size and a certain shape. The holes 10 are formed by cutting from the side surface 7 of the front mass 3 toward the inside. Furthermore, although the hole 10 is formed in an elongated hole shape (see FIG. 2), the shape is not limited thereto.

[0016] In addition, a bending vibration plate 11 is provided on the front side of the front mass 3. When viewed from the front of the front mass 3 (from the left side in FIG. 2), the bending vibration plate 11 is formed in a portion (shown by diagonal lines in FIG. 1) that becomes the upper portion of the hole 10 as shown in FIG. The bending vibration plate 11 is a part of the material that constitutes the front mass 3, and vibration occurs when the center of the plate is displaced significantly in the bending vibration mode. It is preferable that the hole 10 and the bending vibration plate 11 are formed in a positional relationship that is symmetrical with respect to the central axis O of the driving element 2, and in this example, they are formed linearly so as to be centered on the central axis O and to be perpendicular to the central axis O as shown in Figure 1.

[0017] The front surface of the front mass 3 is in contact with an acoustic medium such as water or seawater via a watertight seal material (not shown) such as natural rubber or urethane. The vibration of the front mass 3 is then radiated as sound waves to an acoustic medium such as water via a sealing material or the like.

[0018] In the acoustic wave transmitting and receiving device 1 configured as described above, the front mass 3 has a hollow hole 10, and the upper part of the hole 10 (the shaded part in Figure 1) becomes a bending vibration plate 11, and the central part of the bending vibration plate 11 vibrates in a bending vibration mode in which it is largely displaced. That is, in the acoustic wave transmitting and receiving device 1, when a voltage is applied from a drive circuit (not shown) to excite the piezoelectric element 5, the central part of the front mass 3 vibrates greatly due to bending vibration at the frequency of the bending vibration mode. Here, the vibration generated in the bending vibration plate 11 of the front mass 3 is radiated as a sound wave to an acoustic medium such as water via a sealing material such as rubber.

[0019] Furthermore, in the acoustic wave transmitting and receiving device 1, by providing the holes 10 in the side surfaces 7 of the front mass 3 so as to extend into the interior of the front mass 3, the holes 10 can be easily formed. Therefore, according to the acoustic wave transmitting and receiving device 1, the front mass 3 can be easily processed. Furthermore, in the acoustic wave transmitting and receiving device 1, the position of the hole 10 can be adjusted appropriately on the side surface 7 of the front mass 3, thereby enabling highly sensitive wave transmission and reception at the longitudinal resonant frequency of the wave transmitting and receiving element and the resonant frequency of the bending vibration. Furthermore, in the acoustic wave transmitting and receiving device 1, by appropriately adjusting the position of the hole 10 in the front mass 3, it is possible to adjust the frequencies to be closer to each other within about an octave, and by superimposing the modes, it is possible to achieve high wave transmitting and receiving sensitivity over a wide band.

[0020] Furthermore, in the acoustic wave transmitting and receiving device 1, the resonant frequency of the bending vibration can be set arbitrarily by changing the shape and position of the hole 10. Furthermore, in the acoustic wave transmitting and receiving device 1, the bending vibration plate 11 is in contact with the side surface 7 that forms the outer periphery of the front mass 3, and the shape of the side surface 7 allows access to the cavity that forms the hole 10, so the front mass 3 can be manufactured integrally with the bending vibration plate 11 by cutting. Moreover, the acoustic wave transmitting and receiving device 1 can also be manufactured by additive manufacturing.

[0021] Furthermore, in the acoustic wave transmitting and receiving device 1, the side surface 7 of the front mass 3 is formed with a hole 10 extending inward, so that powder, support material, etc. can be removed from the hole 10 in the side surface 7 after molding. Furthermore, in the acoustic wave transmitting and receiving device 1, the side surface 7 of the front mass 3 is shaped so that a hole 10 extending inward is provided, so that joining processes such as welding or adhesive are not required during manufacturing, and manufacturing can be performed with high precision, making it possible to suppress variations in the resonant frequency of bending vibration. Furthermore, with the acoustic wave transmitting and receiving device 1, there is no possibility of a decrease in strength of the joint due to welding defects or the like, and inspection of the joint state is no longer necessary.

[0022] The above embodiment can be modified as follows. (Variation 1) In the above embodiment, an example of a Langevin type wave transmitting / receiving element in which the front mass 3 and rear mass 4 are connected to the driving element 2 by fastening the bolt 6 that passes through the driving element 2 has been shown, but the present invention may also be applied to a Langevin type transducer that is not fastened with a bolt, as shown in Figures 4 to 6. That is, in the acoustic wave transmitting and receiving device 20 shown in these figures, the front mass 3 (indicated by the reference symbol 3-1), the driving element 2, and the rear mass 4 are joined together by adhesive or other methods rather than by bolting. Note that in such an acoustic wave transmitting and receiving device 20, the rear mass 4 may be omitted as appropriate.

[0023] In the acoustic wave transmitting and receiving device 20, similarly to the acoustic wave transmitting and receiving device 1, the holes 10 are provided in the side surfaces 7 of the front mass 3 so as to extend inward, thereby facilitating the processing of the holes 10. Furthermore, in the acoustic wave transmitting and receiving device 20, the position of the hole 10 can be adjusted appropriately on the side surface 7 of the front mass 3, thereby enabling highly sensitive wave transmission and reception at the longitudinal resonant frequency of the wave transmitting and receiving element and the resonant frequency of the bending vibration.

[0024] (Variation 2) In the above embodiment, the bending vibration plate 11 and the corresponding hole 10 are formed in a positional relationship that is symmetrical with respect to the central axis O of the driving element 2, but in this case, they are not limited to being formed linearly (see FIG. 1), and may be formed in an X-shape around the central axis O as shown in FIG. The bending vibration plate 11 and the hole 10 formed in an X-shape are indicated by the reference numerals 11-1 and 10-1 in FIGS. 4 to 6, respectively. Furthermore, the bending vibration plate 11 and the hole 10 may occupy most of the front mass 3 as shown by reference numerals 11-2 and 10-2 in the front view of FIG.

[0025] (Variation 3) In the above embodiment, the front shape of the front mass 3 is formed in a square shape as shown in Figures 1 and 4, but this is not limited to this, and various shapes can be used, such as a circle as shown by reference numeral 3-2 in Figure 7, a hexagon as shown by reference numeral 3-3 in Figure 8, or an octagon.

[0026] (Variation 4) In the above embodiment, a piezoelectric element 5 made of a piezoelectric ceramic laminate or the like is used as the driving element 2, but this is not limited to this, and any element that can convert between electrical signals and mechanical vibrations, such as a magnetostrictive vibrator or a voice coil, can be used.

[0027] (Variation 5) In the above embodiment, the holes 10 are arranged perpendicular to the side surface 7 of the front mass 3 as shown in Figures 1 to 3 and 4 to 6, but this is not limited to this and the holes 10 may be arranged at any angle relative to the side surface 7 of the front mass 3. 1 to 3 and 4 to 6, the holes 10 are arranged so as to penetrate the front mass 3, but this is not limiting, and the holes may be formed so as not to penetrate the front mass 3 and have an end portion within the front mass 3, as shown by reference numeral 10-3 in Fig. 8. In the embodiment shown in Fig. 8, the bending vibration plate 11 is provided so as to be divided in the middle, as shown by reference numeral 11-3, in correspondence with the holes 10-3.

[0028] (Variation 6) In the above embodiment, a hole 10 and a bending vibration plate 11 (see FIG. 1) having a size of about 1 / 3 of the front area of ​​the front mass 3 are provided, but this is not limited to this. A linear bending vibration plate 11 and a corresponding hole 10 that are small in the vertical direction relative to the front mass 3-4 may also be used, as shown by reference numerals 11-4 and 10-4 in FIG. 9. As a result, in the acoustic wave transmitting and receiving device shown in FIG. 9, it is possible to reduce the directivity in a specific direction (up and down direction in this example) at the frequency of the bending vibration.

[0029] (Variation 7) In the above embodiment, multiple holes 10 may be provided on the side surface 7 of the front mass 3 as shown by the reference numeral 10-5 in Figures 10 and 11, and these holes 10 may be positioned at offset positions that do not pass through the central axis O. In the acoustic wave transmitting and receiving device shown in Figures 10 and 11, by using a front mass 3 (shown by reference numeral 3-5) having a bending vibration plate 11 (shown by reference numeral 11-5) in which the position of the hole 10 is changed with respect to the central axis O, it is possible to provide resonance frequencies for multiple bending vibration modes, thereby making it possible to further widen the bandwidth. Furthermore, by appropriately changing the shape as well as the positions of the bending vibration plate 11 (11-5) and the hole 10 (10-5), it is possible to obtain resonance frequencies of even more diverse bending vibration modes.

[0030] (Variation 8) In the above embodiment, the hole 10 is a hollow elongated hole. That is, the peripheral surface of the hole 10 includes a curved surface. However, the shape of the hole 10 is not limited to such a shape. Alternatively, the hole 10 may be a rectangular cavity, i.e., the peripheral surface of the hole 10 may be a combination of flat surfaces. In another variation, the hole 10 may be a circular cavity.

[0031] Second Embodiment The acoustic wave transmitting and receiving device according to the present disclosure will be described below with reference to FIG. FIG. 12 shows an acoustic wave transmitting and receiving device 100, which includes a driving element 101, a front mass 102, and a rear mass 103.

[0032] The driving element 101 has a first end 101A and a second end 101B. The front mass 102 is connected to the first end 101A of the driving element 101 and has a hole 104 in its side surface 102A. The rear mass 103 is coupled to the second end 101B of the drive element 101 .

[0033] The hole 104 in the front mass 102 is configured to extend from the side surface 102A of the front mass 102 into the interior of the front mass 102. According to the acoustic wave transmitting and receiving device 100 as described above, by providing the holes 104 extending into the interior of the front mass 102 in the side surface 102A of the front mass 102, the holes 104 can be easily formed. Therefore, according to the acoustic wave transmitting and receiving device 100, the front mass 102 can be easily processed.

[0034] Third Embodiment A method for constructing an acoustic wave transmitting and receiving device according to the present disclosure will be described below with reference to FIGS. 1 to 3 and 13. FIG. FIG. 13 is a flowchart showing the steps of the method for constructing the acoustic wave transmitting and receiving device 1.

[0035] [Step S1] The worker forms a hole 10 extending inward from a side surface 7, which is one side surface of the front mass 3. The hole 10 is formed by cutting from the side surface 7 of the front mass 3 toward the inside. The worker also provides a bending vibration plate 11 on the surface of the front mass 3 at a position corresponding to the position of the hole 10 .

[0036] [Step S2] The worker connects the front mass 3 processed in step S1 to the first end 2A of the driving element 2, which will be the Langevin type wave transmitting and receiving element. In this case, the hole 10 is configured to extend in the front mass 3 in a direction perpendicular to the central axis O of the drive element 2, with the hole 10 being an opening having a certain size and a certain shape.

[0037] [Step S3] The worker connects the rear mass 4 to the second end 2B of the drive element 2. The front mass 3 and rear mass 4 are connected by tightening a bolt 6 that passes through the drive element 2.

[0038] In the method for constructing the acoustic wave transmitting and receiving device 1 as described above, by providing the holes 10 in the side surfaces 7 of the front mass 3 so as to extend into the interior of the front mass 3, the processing of the holes 10 becomes easy. Therefore, according to the method for constructing the acoustic wave transmitting and receiving device, the front mass 3 can be easily processed. Furthermore, in the method for constructing the acoustic wave transmitting and receiving device 1, the position of the hole 10 can be adjusted appropriately on the side surface 7 of the front mass 3, thereby enabling highly sensitive wave transmission and reception at the longitudinal resonant frequency of the wave transmitting and receiving element and the resonant frequency of the bending vibration.

[0039] The holes 10 may be formed as elongated cavities with openings of a certain size and shape, or may be formed as slotted cavities. The holes 10 may also be formed as through cavities that reach the opposite side of the front mass 3, or as non-through cavities that terminate within the front mass 3. A plurality of holes 10 may also be provided within the front mass 3 (see FIG. 8).

[0040] In addition, the bending vibration plate 11 and the hole 10 can be formed in a linear, rectangular, or X-shaped configuration when viewed from the front from the direction along the central axis O, or can be positioned at a position offset from the central axis O (see Figures 4 to 11).

[0041] <Fourth embodiment> A method for constructing an acoustic wave transmitting and receiving device according to the present disclosure will be described below with reference to FIG. FIG. 13 is a flowchart showing the steps of a method for constructing an acoustic wave transmitting and receiving device.

[0042] [Step S1] A hole is formed extending from one side surface of the front mass to the interior.

[0043] [Step S2] A front mass is connected to a first end of the driving element, which serves as the wave transmitting and receiving element.

[0044] [Step S3] A rear mass is coupled to a second end of the drive element.

[0045] In the method for constructing the acoustic wave transmitting and receiving device described above, by providing a hole in the side surface of the front mass that extends into the interior of the front mass, the processing of the hole becomes easy. Therefore, according to the method for constructing the acoustic wave transmitting and receiving device, the front mass can be easily processed.

[0046] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0047] Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes.

[0048] (Appendix 1) a drive element having a first end and a second end; a front mass having a hole in a side surface and connected to a first end of the drive element; a rear mass coupled to a second end of the drive element; Equipped with the hole extends from a side surface of the front mass to an interior of the front mass; Acoustic wave transmitting and receiving device.

[0049] (Appendix 2) the hole is a cavity extending through an opening having a fixed size and a fixed shape; 2. An acoustic wave transmitting and receiving device according to claim 1.

[0050] (Appendix 3) The hole is a slot-shaped cavity. 3. An acoustic wave transmitting and receiving device according to claim 1 or 2.

[0051] (Appendix 4) The hole is a hollow that penetrates to the opposite side of the front mass. 4. The acoustic wave transmitting and receiving device according to any one of claims 1 to 3.

[0052] (Appendix 5) the hole is a non-through cavity terminating within the front mass; 5. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 4.

[0053] (Appendix 6) A plurality of the holes are provided in the front mass. 6. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 5.

[0054] (Appendix 7) A bending vibration plate is provided on the surface of the front mass in correspondence with the positions of the holes. 7. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 6.

[0055] (Appendix 8) The hole is formed by cutting from the side surface of the front mass toward the inside. 8. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 7.

[0056] (Appendix 9) The holes are formed in a symmetrical positional relationship with respect to the central axis of the drive element. 9. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 8.

[0057] (Appendix 10) The bending vibration plate and the hole are formed linearly when viewed from the front in a direction along the central axis. 10. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 9.

[0058] (Appendix 11) The bending vibration plate and the hole are formed in a quadrangular shape when viewed from a direction along the central axis. 11. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 10.

[0059] (Appendix 12) The bending vibration plate and the hole are formed in an X shape when viewed from a direction along the central axis. 12. An acoustic wave transmitting and receiving device according to any one of claims 1 to 11.

[0060] (Appendix 13) A plurality of the holes are provided in the front mass and are arranged at positions offset from the central axis. 13. An acoustic wave transmitting and receiving device according to any one of appendices 1 to 12.

[0061] (Appendix 14) A hole is formed extending from the side of the front mass to the inside, the front mass is located at a first end of the driving element; a rear mass disposed at a second end of the driving element; A method for constructing an acoustic wave transmitting and receiving device.

[0062] (Appendix 15) The hole is formed by cutting from the side surface of the front mass toward the inside. A method for constructing an acoustic wave transmitting and receiving device according to claim 14.

[0063] (Appendix 16) The holes are formed in a symmetrical positional relationship with respect to the central axis of the drive element. 16. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendix 14 and 15.

[0064] (Appendix 17) the hole is a cavity extending through an opening having a fixed size and a fixed shape; A method for constructing an acoustic wave transmitting and receiving device according to any one of claims 14 to 16.

[0065] (Appendix 18) The hole is a slot-shaped cavity. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 17.

[0066] (Appendix 19) The hole is a hollow that penetrates to the opposite side of the front mass. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 18.

[0067] (Appendix 20) the hole is a non-through cavity terminating within the front mass; A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 19.

[0068] (Appendix 21) A plurality of the holes are provided in the front mass. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 20.

[0069] (Appendix 22) a bending vibration plate is provided on the surface of the front mass in correspondence with the positions of the holes; A method for constructing an acoustic wave transmitting and receiving device according to any one of Supplementary Notes 14 to 21.

[0070] (Appendix 23) The bending vibration plate and the hole are formed linearly when viewed from the front in a direction along the central axis. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 22.

[0071] (Appendix 24) The bending vibration plate and the hole are formed in a quadrangular shape when viewed from a direction along the central axis. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 23.

[0072] (Appendix 25) The bending vibration plate and the hole are formed in a cross shape when viewed from a direction along the central axis. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 24.

[0073] (Appendix 26) A plurality of the holes are provided in the front mass, and are arranged at positions offset from the central axis. A method for constructing an acoustic wave transmitting and receiving device according to any one of appendices 14 to 25. [Explanation of symbols]

[0074] 1. Acoustic wave transmitting and receiving device 2. Drive element 2A First end of the driving element 2B Second end of the driving element 2C electrode 3 Front Mass 3-1 Front mass 3-2 Front mass 3-3 Front mass 3-4 Front mass 3-5 Front mass 4 Rear Mass 5 Piezoelectric element 6 volts 7 Side 10 holes 10-1 hole 10-2 holes 10-3 holes 10-4 holes 10-5 holes 11 Flexural vibration plate 11-1 Flexural vibration plate 11-2 Flexural vibration plate 11-3 Flexural vibration plate 11-4 Flexural vibration plate 11-5 Flexural vibration plate 20 Acoustic Transmitting and Receiving Device 100 Acoustic wave transmitting and receiving device 101 Drive element 101A First end of driving element 101B second end of driving element 102 Front Mass 102A Front Mass Side 103 Rear Mass О Center axis

Claims

1. a drive element having a first end and a second end; a front mass having a hole in a side surface and connected to a first end of the drive element; a rear mass coupled to a second end of the drive element; Equipped with the hole extends from a side surface of the front mass to an interior of the front mass; Acoustic wave transmitting and receiving device.

2. the hole is a cavity extending through an opening having a fixed size and a fixed shape; The acoustic wave transmitting and receiving device according to claim 1 .

3. The hole is a slot-shaped cavity. The acoustic wave transmitting and receiving device according to claim 2 .

4. The hole is a hollow that penetrates to the opposite side of the front mass. The acoustic wave transmitting and receiving device according to claim 1 .

5. the hole is a non-through cavity terminating within the front mass; The acoustic wave transmitting and receiving device according to claim 1 .

6. A plurality of the holes are provided in the front mass. The acoustic wave transmitting and receiving device according to claim 1 .

7. A bending vibration plate is provided on the surface of the front mass in correspondence with the positions of the holes. The acoustic wave transmitting and receiving device according to claim 1 .

8. A hole is formed extending from the side of the front mass to the inside, the front mass is located at a first end of the driving element; a rear mass disposed at a second end of the driving element; A method for constructing an acoustic wave transmitting and receiving device.

9. The hole is formed by cutting from the side surface of the front mass toward the inside. A method for constructing the acoustic wave transmitting and receiving device according to claim 8.

10. The holes are formed in a symmetrical positional relationship with respect to the central axis of the drive element. A method for constructing the acoustic wave transmitting and receiving device according to claim 8 or 9.

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