Ultrasonic generator

Abstract

This technology provides the ability to introduce longitudinal and transverse waves into a waveguide by utilizing transverse waves generated at the first reflection surface. [Solution] The ultrasonic generator 10 comprises an ultrasonic source 11, an ultrasonic focusing unit 12, and a waveguide 13. The ultrasonic focusing unit 12 has a first reflecting surface 21 and a second reflecting surface 22. The ultrasonic source 11 generates longitudinal ultrasonic waves. The first reflecting surface 21 generates a first transverse reflected wave when it reflects the longitudinal ultrasonic waves generated from the ultrasonic source 11. When the second reflecting surface 22 reflects the first transverse reflected wave, it converts the first transverse reflected wave generated on a part of the first reflecting surface 21 into a longitudinal wave and reflects it so that it is introduced into the waveguide 13, and also reflects the first transverse reflected wave generated on the remaining part or all of the first reflecting surface 21 so that it is introduced into the waveguide 13 as a transverse wave.

Description

[Technical Field]

[0001] The present disclosure relates to an ultrasonic generator. [Background Art]

[0002] Patent Document 1 discloses an ultrasonic irradiator. This ultrasonic irradiator includes an ultrasonic transducer and an acoustic propagation body that propagates ultrasonic waves from the ultrasonic transducer. The acoustic propagation body includes a main body and a shaft extending forward from a front surface of the main body. The front surface of the main body functions as a concave primary reflecting surface that reflects ultrasonic waves from the ultrasonic transducer. The main body has a flat rear surface to which the ultrasonic transducer is bonded. The main body has a well connected to the rear surface. A bottom surface of the well functions as a concave secondary reflecting surface that reflects a primary reflected wave from the primary reflecting surface. The secondary reflected wave from the secondary reflecting surface propagates through the shaft and is irradiated forward from a distal end surface of the shaft. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent No. 6774697 [Summary of Invention] [Problem to be Solved by Invention]

[0004] In the technology of Patent Document 1, longitudinal waves and transverse waves are generated when the primary reflecting surface (first reflecting surface) reflects ultrasonic waves from the ultrasonic transducer. However, Patent Document 1 does not consider utilizing transverse waves generated at the primary reflecting surface (first reflecting surface).

[0005] An object of the present disclosure is to provide a technology capable of introducing longitudinal waves and transverse waves into a waveguide by utilizing transverse waves generated at a first reflecting surface. [Means for Solving Problem]

[0006] The ultrasonic generator of the present disclosure is An ultrasonic source that generates ultrasound, An ultrasonic focusing unit that focuses the ultrasonic waves generated from the ultrasonic source, The system comprises a waveguide for transmitting the ultrasonic waves focused by the ultrasonic focusing unit, The aforementioned ultrasonic focusing unit is A first reflective surface that reflects the ultrasonic waves generated by the ultrasonic wave source, The system includes a second reflective surface that reflects a first reflected wave generated when the ultrasonic wave is reflected by the first reflective surface, An ultrasonic generator comprising a first reflective surface and a second reflective surface arranged such that a second reflected wave, generated by the reflection of the first reflected wave by the second reflective surface, is introduced into the waveguide, The ultrasonic source generates longitudinal ultrasonic waves, The first reflecting surface generates a transverse wave first reflected wave when it reflects the longitudinal wave ultrasonic waves generated from the ultrasonic wave source. When the second reflecting surface reflects the first reflected wave of a transverse wave, it converts the first reflected wave of a transverse wave generated at a part of the first reflecting surface into a longitudinal wave and reflects it so that it is introduced into the waveguide, and reflects the first reflected wave of a transverse wave generated at the remaining part or all of the first reflecting surface so that it is introduced into the waveguide as a transverse wave. [Effects of the Invention]

[0007] According to this disclosure, longitudinal and transverse waves can be introduced into the waveguide by utilizing transverse waves generated at the first reflection surface. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view of the ultrasonic generator according to the first embodiment. [Figure 2] Figure 2 is a front view of the ultrasonic generator according to the first embodiment. [Figure 3] Figure 3 is a graph showing the relationship between the angle of incidence and the energy conversion rate from longitudinal waves to transverse waves. [Figure 4]Figure 4 is a graph showing the relationship between the angle of incidence and the energy conversion rate from transverse waves to longitudinal waves. [Figure 5] Figure 5 is a graph showing the relationship between the angle of incidence and the energy conversion rate when the wave is reflected as a transverse wave. [Figure 6] Figure 6 is a conceptual diagram illustrating how ultrasound propagates. [Figure 7] Figure 7 is a perspective view of the ultrasonic generator according to the second embodiment. [Modes for carrying out the invention]

[0009] [Description of Embodiments in this Disclosure] The embodiments of this disclosure are listed and illustrated below.

[0010] [1] An ultrasonic source that generates ultrasound, An ultrasonic focusing unit that focuses the ultrasonic waves generated from the ultrasonic source, The system comprises a waveguide for transmitting the ultrasonic waves focused by the ultrasonic focusing unit, The aforementioned ultrasonic focusing unit is A first reflective surface that reflects the ultrasonic waves generated by the ultrasonic wave source, The system includes a second reflective surface that reflects a first reflected wave generated when the ultrasonic wave is reflected by the first reflective surface, An ultrasonic generator comprising a first reflective surface and a second reflective surface arranged such that a second reflected wave, generated by the reflection of the first reflected wave by the second reflective surface, is introduced into the waveguide, The ultrasonic source generates longitudinal ultrasonic waves, The first reflecting surface generates a transverse wave first reflected wave when it reflects the longitudinal wave ultrasonic waves generated from the ultrasonic wave source. When the second reflecting surface reflects the first reflected wave of a transverse wave, it converts the first reflected wave of a transverse wave generated at a part of the first reflecting surface into a longitudinal wave and reflects it so that it is introduced into the waveguide, and reflects the first reflected wave of a transverse wave generated at the remaining part or all of the first reflecting surface so that it is introduced into the waveguide as a transverse wave. Ultrasonic generator.

[0011] According to this configuration, by utilizing the first reflected transverse wave generated on the first reflection surface, the longitudinal wave and the second reflected transverse wave can be separately generated and respectively introduced into the waveguide.

[0012] [2] A Poisson's ratio of a member constituting the second reflection surface is 0.25 or more and 0.35 or less, an incident angle of the first reflected transverse wave that is converted into a longitudinal wave at the second reflection surface is 15° or more and 30° or less, an incident angle of the first reflected transverse wave that is reflected as a transverse wave at the second reflection surface is 35° or more and 40° or less The ultrasonic generator according to [1].[※END]]

[0013] According to this configuration, it is easy to improve the conversion efficiency when converting the first reflected transverse wave into a longitudinal wave at the second reflection surface, and the conversion efficiency when reflecting the first reflected transverse wave as a transverse wave at the second reflection surface.

[0014] [3] A structure formed by the ultrasonic generation source, the ultrasonic focusing section, and the waveguide is formed with a through hole penetrating linearly along the waveguide The ultrasonic generator according to [1] or [2].[※END]]

[0015] According to this configuration, a user can observe, from the inside of the through hole, how an object arranged at a tip end of the through hole is affected by ultrasonic vibration of the waveguide.

[0016] [Detailed Description of Embodiments of the Present Disclosure] The ultrasonic generator of the present disclosure is used in, for example, ultrasonic diagnostic apparatuses, ultrasonic therapeutic apparatuses, cavitation generators, dental scalers, blood coagulation incision apparatuses (ultrasonic scalpels), ultrasonic processing machines, ultrasonic cleaners, minimally invasive medical apparatuses, atomization apparatuses, sensors, and the like. The ultrasonic generator of the present disclosure is also used for frequency dependency investigation using high-intensity ultrasound in bioengineering and the like.

[0017] <First Embodiment> Figure 1 discloses an ultrasonic generator 10. The ultrasonic generator 10 comprises an ultrasonic source 11, an ultrasonic focusing unit 12, and a waveguide 13. The ultrasonic generator 10 focuses the ultrasonic waves generated by the ultrasonic source 11 with the ultrasonic focusing unit 12 and introduces them into the waveguide 13.

[0018] As shown in Figures 1 and 2, the ultrasonic source 11, the ultrasonic focusing unit 12, and the waveguide 13 each have a shape that is formed when a figure on a plane is rotated once around a straight line on that plane as an axis. In other words, the ultrasonic source 11, the ultrasonic focusing unit 12, and the waveguide 13 each have a shape that is a body of rotation.

[0019] The ultrasonic source 11 generates ultrasonic waves. The ultrasonic source 11 is composed of, for example, a piezoelectric element. The piezoelectric element has a piezoelectric body made of piezoelectric ceramics and electrodes arranged on both sides of the piezoelectric body. The ultrasonic source 11 is plate-shaped. The ultrasonic source 11 has thickness. The thickness direction of the ultrasonic source 11 is the stacking direction of the piezoelectric body and electrodes. The ultrasonic source 11 generates ultrasonic waves when an AC voltage based on the power supply P is applied. The ultrasonic source 11 generates ultrasonic waves at a frequency of, for example, 30 kHz or higher and 10 MHz or lower. The ultrasonic source 11 generates ultrasonic waves in its own thickness direction. The ultrasonic source 11 generates ultrasonic waves forward. The ultrasonic source 11 is bonded to the rear surface of the ultrasonic focusing unit 12.

[0020] The ultrasonic focusing unit 12 focuses the ultrasonic waves generated from the ultrasonic source 11. The ultrasonic focusing unit 12 is made of, for example, a metal (e.g., duralumin). The ultrasonic focusing unit 12 has a first reflective surface 21 and a second reflective surface 22.

[0021] The first reflecting surface 21 is positioned in front of the ultrasonic source 11. The first reflecting surface 21 reflects the ultrasonic waves generated by the ultrasonic source 11 toward the second reflecting surface 22. The first reflecting surface 21 is annular (more specifically, circular) around an axis extending along the waveguide 13. The first reflecting surface 21 extends in the front-to-back direction. The first reflecting surface 21 curves radially inward (i.e., toward the center of the axis) as it moves forward.

[0022] The second reflecting surface 22 is positioned behind the front end of the first reflecting surface 21. The second reflecting surface 22 is positioned in front of the rear end of the first reflecting surface 21. The second reflecting surface 22 is positioned radially inward (i.e., towards the center of the axis) than the first reflecting surface 21. The second reflecting surface 22 forms an annular shape (more specifically, a circular annulus) around an axis extending along the waveguide 13. The second reflecting surface 22 extends in the front-rear direction. The second reflecting surface 22 curves so that it approaches radially inward (i.e., towards the center of the axis) as it moves forward. The second reflecting surface 22 reflects the first reflected wave generated when ultrasonic waves generated from the ultrasonic source 11 are reflected by the first reflecting surface 21. The second reflecting surface 22 reflects the first reflected wave toward the base end (more specifically, the rear end) of the waveguide 13. The second reflecting surface 22 is positioned opposite the first reflecting surface 21. The first reflective surface 21 and the second reflective surface 22 are arranged such that the second reflected wave, generated when the first reflected wave is reflected by the second reflective surface 22, is introduced into the waveguide 13.

[0023] Waveguide 13 transmits ultrasonic waves focused by ultrasonic focusing unit 12. Waveguide 13 has a linear shape extending in the front-to-back direction. The rear end of waveguide 13 is connected to ultrasonic focusing unit 12. Waveguide 13 has a cylindrical shape (more specifically, a cylindrical shape) extending forward from the front end of ultrasonic focusing unit 12.

[0024] In this embodiment, the waveguide 13 is described as a separate component from the ultrasonic focusing unit 12, but it may be the same component as the ultrasonic focusing unit 12. The waveguide 13 is preferably made of a material with high ultrasonic propagation properties, such as an aluminum alloy or metallic glass. Alternatively, the waveguide 13 may be made of a shape memory alloy, such as an alloy of titanium and nickel. The waveguide 13 is elastically deformable.

[0025] The ultrasonic source 11 described above generates longitudinal ultrasonic waves. These longitudinal waves are incident on the first reflecting surface 21. When the longitudinal waves generated by the ultrasonic source 11 are reflected by the first reflecting surface 21, longitudinal and transverse waves are generated. The reflection angle of the longitudinal waves generated at the first reflecting surface 21 is the same as the incidence angle of the longitudinal waves incident on the first reflecting surface 21. The reflection angle of the transverse waves generated at the first reflecting surface 21 is smaller than the incidence angle of the longitudinal waves incident on the first reflecting surface 21. This relationship follows Snell's law. In other words, because the propagation speed of transverse waves is smaller than that of longitudinal waves, the reflection angle of the transverse waves generated at the first reflecting surface 21 is smaller than the incidence angle of the longitudinal waves incident on the first reflecting surface 21.

[0026] The energy conversion rate from longitudinal waves to transverse waves at the first reflecting surface 21 varies depending on the Poisson's ratio of the material constituting the first reflecting surface 21 and the angle of incidence of the longitudinal waves, as shown in Figure 3. The first reflecting surface 21 includes reflection points 21A and 21B where the energy conversion rate from longitudinal waves to transverse waves is 40% or more, as shown in Figure 6. In Figure 6, longitudinal waves are represented by solid lines and transverse waves by dashed lines. Reflection point 21B is located behind reflection point 21A. For example, at a reflection point where the Poisson's ratio of the material constituting the first reflecting surface 21 is 0.25 or more and 0.35 or less, and the angle of incidence of the longitudinal waves is 30° or more and 80° or less, the energy conversion rate from longitudinal waves is approximately 40% or more.

[0027] The first reflecting surface 21 is curved so that the transverse waves generated on the first reflecting surface 21 are focused. For example, the first reflecting surface 21 is shaped along an ellipse, and the ratio of the major axis to the minor axis of the ellipse satisfies the condition of equation (1) below. Major axis: Minor axis = CDA: √(CDA 2 -CTA2 )...Equation (1) CDA is the propagation speed of longitudinal waves incident on the first reflecting surface 21. CTA is the propagation speed of transverse waves generated at the first reflecting surface 21. With this configuration, transverse waves generated at the first reflective surface 21 are focused.

[0028] The first reflected wave of a transverse wave generated at the first reflecting surface 21 is incident on the second reflecting surface 22. When the transverse wave of the first reflecting surface 21 is reflected by the second reflecting surface 22, longitudinal and transverse waves are generated. The reflection angle of the transverse wave generated at the second reflecting surface 22 is the same as the incident angle of the transverse wave incident on the second reflecting surface 22. The reflection angle of the longitudinal wave generated at the second reflecting surface 22 is greater than the incident angle of the transverse wave incident on the second reflecting surface 22. This relationship follows Snell's law. In other words, because the propagation speed of longitudinal waves is greater than that of transverse waves, the reflection angle of the longitudinal wave generated at the second reflecting surface 22 is greater than the incident angle of the transverse wave incident on the second reflecting surface 22.

[0029] When the second reflecting surface 22 reflects the first reflected wave of a transverse wave, it converts the first reflected wave of a transverse wave generated at a portion of the first reflecting surface 21 into a longitudinal wave and reflects it so that it is introduced into the waveguide 13. For example, as shown in Figure 6, the reflection point 22A of the second reflecting surface 22 converts the first reflected wave of a transverse wave generated at the reflection point 21A of the first reflecting surface 21 into a longitudinal wave and reflects it so that it is introduced into the waveguide 13. The second reflected wave of a longitudinal wave generated at reflection point 22A travels in a straight line along the direction of extension of the waveguide 13.

[0030] The energy conversion rate from transverse waves to longitudinal waves at the second reflecting surface 22 varies depending on the Poisson's ratio of the material constituting the second reflecting surface 22 and the angle of incidence of the transverse waves, as shown in Figure 4. For example, at a reflection point where the Poisson's ratio of the material constituting the second reflecting surface 22 is 0.25 or more and 0.35 or less, and the angle of incidence of the longitudinal waves is 15° or more and 30° or less, the energy conversion rate from transverse waves to longitudinal waves is approximately 40% or more.

[0031] Furthermore, the second reflecting surface 22 reflects the first reflected wave of the transverse wave generated at the remaining part or all of the first reflecting surface 21 so that it is introduced into the waveguide 13 as a transverse wave. For example, as shown in Figure 6, the reflection point 22B of the second reflecting surface 22 reflects the first reflected wave of the transverse wave generated at the reflection point 21B of the first reflecting surface 21 so that it is introduced into the waveguide 13 as a transverse wave. The second reflected wave of the transverse wave generated at reflection point 22B travels in a straight line along the direction of extension of the waveguide 13.

[0032] The energy conversion rate when waves are reflected as transverse waves at the second reflecting surface 22 varies depending on the Poisson's ratio of the material constituting the second reflecting surface 22 and the angle of incidence of the transverse waves, as shown in Figure 5. For example, at a reflection point where the Poisson's ratio of the material constituting the second reflecting surface 22 is 0.25 or more and 0.35 or less, and the angle of incidence of the longitudinal waves is 35° or more and 40° or less, the energy conversion rate when waves are reflected as transverse waves is approximately 40% or more.

[0033] As a result, longitudinal and transverse ultrasonic waves generated at the second reflection surface 22 are introduced into the waveguide 13. In other words, with this configuration, the first reflected transverse wave generated at the first reflection surface 21 can be used to separately generate second reflected longitudinal and transverse waves, and each can be introduced into the waveguide 13. The ultrasonic waves introduced into the waveguide 13 are transmitted to the end of the waveguide 13 and then transmitted to the object 90 installed at the end of the waveguide 13.

[0034] Furthermore, the structure, which consists of an ultrasonic source 11, an ultrasonic focusing unit 12, and a waveguide 13, has a through-hole 30 that extends linearly along the waveguide 13. The through-hole 30 is linear in shape and extends in the front-to-back direction. The through-hole 30 opens at the end of the waveguide 13. The opening at the end of the waveguide 13 is blocked by the object 90. A microscope lens is placed inside the through-hole 30. The user can observe from inside the through-hole 30 how the ultrasonic vibrations of the waveguide 13 affect the object 90 placed at the end of the through-hole 30.

[0035] A recess 31 is formed in the ultrasonic focusing section 12. The recess 31 is recessed backward along the outer surface of the waveguide 13 from the radially inward end (i.e., the end towards the axis) of the first reflecting surface 21. The recess 31 is formed continuously around the entire circumference.

[0036] The recess 31 is positioned so as to be off the path taken by the transverse waves generated at the first reflecting surface 21 towards the second reflecting surface 22. Therefore, the recess 31 does not obstruct the propagation of transverse waves from the first reflecting surface 21 towards the second reflecting surface 22.

[0037] The recess 31 is filled with air. Therefore, when the second reflected wave generated on the second reflective surface 22 enters the radially inward side of the annular recess 31, its radial outward movement is prevented by the recess 31. In other words, the ultrasonic generator 10 can prevent the second reflected wave generated on the second reflective surface 22 from veering off the waveguide 13 as it travels towards the waveguide 13, by using the recess 31.

[0038] <Second Embodiment> In the first embodiment, an example was described in which the ultrasonic generator has a rotating body shape. In contrast, in the second embodiment, an example is described in which the ultrasonic generator has a shape obtained by stretching the cross-sectional shape shown in Figure 1 in a specific direction perpendicular to the front-to-back direction.

[0039] The ultrasonic generator 210 of the second embodiment comprises a first ultrasonic generating unit 250 and a second ultrasonic generating unit 260, as shown in Figure 7. The first ultrasonic generating unit 250 and the second ultrasonic generating unit 260 are symmetrical with respect to a plane parallel to the front-rear direction. The first ultrasonic generating unit 250 and the second ultrasonic generating unit 260 are spaced apart from each other in directions perpendicular to the front-rear direction and a specific direction. The ultrasonic generator 210 of the second embodiment has a cross-sectional shape that is stretched in a specific direction from the shape shown in Figure 1.

[0040] The first ultrasonic generating unit 250 comprises a first ultrasonic generating source 251, a first ultrasonic focusing unit 252, and a first waveguide 253. The first ultrasonic generating source 251 corresponds to an example of an ultrasonic generating source. The first ultrasonic generating source 251 generates ultrasonic waves. The first ultrasonic focusing unit 252 corresponds to an example of an ultrasonic focusing unit. The first ultrasonic focusing unit 252 focuses the ultrasonic waves generated from the first ultrasonic generating source 251. The first waveguide 253 corresponds to an example of a waveguide. The first waveguide 253 transmits the ultrasonic waves focused by the first ultrasonic focusing unit 252. The first ultrasonic focusing unit 252 has a first reflective surface 254 that reflects ultrasonic waves generated by the first ultrasonic generating source 251, and a second reflective surface 255 that reflects the first reflected wave generated when ultrasonic waves are reflected by the first reflective surface 254. The first reflecting surface 254 and the second reflecting surface 255 are arranged such that the second reflected wave, generated when the first reflected wave is reflected by the second reflecting surface 255, is introduced into the first waveguide 253. The first ultrasonic source 251 generates longitudinal ultrasonic waves. When the first reflecting surface 254 reflects the longitudinal ultrasonic waves generated from the first ultrasonic source 251, it generates a transverse first reflected wave. When the second reflecting surface 255 reflects the transverse first reflected wave, it converts the transverse first reflected wave generated by a part of the first reflecting surface 254 into a longitudinal wave and reflects it so that it is introduced into the first waveguide 253, and also reflects the remaining part or all of the transverse first reflected wave generated by the first reflecting surface 254 so that it is introduced into the first waveguide 253 as a transverse wave.

[0041] The second ultrasonic generating unit 260 comprises a second ultrasonic generating source 261, a second ultrasonic focusing unit 262, and a second waveguide 263. The second ultrasonic generating source 261 corresponds to an example of an ultrasonic generating source. The second ultrasonic generating source 261 generates ultrasonic waves. The second ultrasonic focusing unit 262 corresponds to an example of an ultrasonic focusing unit. The second ultrasonic focusing unit 262 focuses the ultrasonic waves generated from the second ultrasonic generating source 261. The second waveguide 263 corresponds to an example of a waveguide. The second waveguide 263 transmits the ultrasonic waves focused by the second ultrasonic focusing unit 262. The second ultrasonic focusing unit 262 has a first reflective surface 264 that reflects ultrasonic waves generated by the second ultrasonic generating source 261, and a second reflective surface 265 that reflects the first reflected wave generated when ultrasonic waves are reflected by the first reflective surface 264. The first reflecting surface 264 and the second reflecting surface 265 are arranged such that the second reflected wave, generated when the first reflected wave is reflected by the second reflecting surface 265, is introduced into the second waveguide 263. The second ultrasonic source 261 generates longitudinal ultrasonic waves. When the second reflecting surface 265 reflects the longitudinal ultrasonic waves generated from the second ultrasonic source 261, it generates a transverse first reflected wave. When the second reflecting surface 265 reflects the transverse first reflected wave, it converts the transverse first reflected wave generated by a part of the first reflecting surface 264 into a longitudinal wave and reflects it so that it is introduced into the second waveguide 263, and also reflects the remaining part or all of the transverse first reflected wave generated by the first reflecting surface 264 so that it is introduced into the second waveguide 263 as a transverse wave.

[0042] According to the ultrasonic generator 210 of the second embodiment, longitudinal waves can be introduced into the first waveguide 253 using transverse waves generated at the first reflecting surface 254 over a wide range, and longitudinal waves can be introduced into the second waveguide 263 using transverse waves generated at the first reflecting surface 264.

[0043] <Other Embodiments> The present invention is not limited to the embodiments described above and in the drawings, and the following embodiments, for example, are also included in the technical scope of the present invention. Furthermore, the various features of the embodiments described above and those described later may be combined in any way as long as they are not contradictory.

[0044] In the second embodiment, the first ultrasonic source 251, the first ultrasonic focusing unit 252, and the first waveguide 253 were configured to be continuously arranged in a specific direction. In contrast, the first ultrasonic source 251 may be composed of multiple members and may be arranged intermittently in a specific direction. The first ultrasonic focusing unit 252 may be composed of multiple members and may be arranged intermittently in a specific direction. The first waveguide 253 may be composed of multiple members and may be arranged intermittently in a specific direction. The same applies to the second ultrasonic source 261, the second ultrasonic focusing unit 262, and the second waveguide 263.

[0045] The ultrasonic generator may consist of only one of the first ultrasonic generating unit 250 and the second ultrasonic generating unit 260 of the second embodiment.

[0046] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope set forth in the claims or equivalents thereof. [Explanation of Symbols]

[0047] 10… Ultrasonic generator 11… Ultrasonic source 12...Ultrasonic focusing section 13... Waveguides 21...First reflective surface 21A…Reflection point 21B…Reflection point 22…Second reflective surface 22A…Reflection point 22B…Reflection point 30…Through hole 90...Target object 210... Ultrasonic generator 250...First ultrasonic generating unit 251...First ultrasonic source (ultrasonic source) 252...First ultrasonic focusing section (ultrasonic focusing section) 253...First Waveguide (Waveguide) 254...1st reflective surface 255…Second reflective surface 260...Second ultrasonic generator 261...Second ultrasonic source (ultrasonic source) 262...Second ultrasonic focusing section (ultrasonic focusing section) 263... Second Waveguide (Waveguide) 264…1st reflective surface 265…Second reflective surface P…Power supply

Claims

1. An ultrasonic source that generates ultrasound, An ultrasonic focusing unit that focuses the ultrasonic waves generated from the ultrasonic source, The system comprises a waveguide for transmitting the ultrasonic waves focused by the ultrasonic focusing unit, The aforementioned ultrasonic focusing unit is A first reflective surface that reflects the ultrasonic waves generated by the ultrasonic wave source, The system includes a second reflective surface that reflects a first reflected wave generated when the ultrasonic wave is reflected by the first reflective surface, An ultrasonic generator comprising a first reflective surface and a second reflective surface arranged such that a second reflected wave, generated by the reflection of the first reflected wave by the second reflective surface, is introduced into the waveguide, The ultrasonic source generates longitudinal ultrasonic waves, The first reflecting surface generates a transverse wave first reflected wave when it reflects the longitudinal wave ultrasonic waves generated from the ultrasonic wave source. When the second reflecting surface reflects the first reflected wave of a transverse wave, it converts the first reflected wave of a transverse wave generated at a part of the first reflecting surface into a longitudinal wave and reflects it so that it is introduced into the waveguide, and reflects the first reflected wave of a transverse wave generated at the remaining part or all of the first reflecting surface so that it is introduced into the waveguide as a transverse wave. Ultrasonic generator.

2. The Poisson's ratio of the member constituting the second reflective surface is 0.25 or more and 0.35 or less. The incidence angle of the first reflected wave of the transverse wave converted into a longitudinal wave at the second reflecting surface is 15° or more and 30° or less. The angle of incidence of the first reflected wave, which is a transverse wave reflected as a transverse wave by the second reflecting surface, is 35° or more and 40° or less. The ultrasonic generator according to claim 1.

3. The structure comprising the ultrasonic source, the ultrasonic focusing unit, and the waveguide has through-holes formed that penetrate linearly along the waveguide. The ultrasonic generator according to claim 1 or claim 2.

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