Vibration Wave Radiation Device

Abstract

In the present invention, the relation of 0.78 λ≤L≤ 1.19λ or 1.5λ≤ L≤2.14λ is satisfied when TD = 0 and is within the range of 35°≤θ≤55°, and when: TD represents the distance between a connecting section (121), which is perpendicular to a reflective surface section (130), and the reflective surface section (130); θ represents an angle formed, in a longitudinal section, between a virtual line (VL), which is parallel to the reflective surface section (130), and a back surface (120b) of a vibrating section (122); L represents the shortest distance between a peripheral edge (123) of the back surface (120b) at the distal end, of the vibrating section (122), on the side opposite to the connecting section (121) side and the peripheral edge of the reflective surface section (130); and λ represents the wavelength of a vibrating wave emitted from the vibrating section (122).

Description

[Technical field]

[0001] The present invention relates to a vibration wave emitting device. [Background technology]

[0002] A prior art document disclosing the configuration of an ultrasonic transmitter is JP-A-9-327095 (Patent Document 1). The ultrasonic transmitter described in Patent Document 1 includes a transducer, a cone transducer, a conical horn, and a base. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-327095 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to achieve high sound pressure output by adjusting the phase of the reflected wave of the ultrasound emitted from the back surface of the cone vibrator, it is necessary to specify the relationship between the size of the cone vibrator and the size of the reflecting surface, but Patent Document 1 does not take this relationship into consideration.

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a vibration wave radiating device capable of generating vibration waves with high sound pressure. [Means for solving the problem]

[0006] The vibration wave radiating device according to the present invention includes a vibrator, a vibrating body, and a reflecting surface portion. The vibrator generates vibrations. The vibrating body is connected to the vibrator, and has a front surface and a back surface located near the vibrator and opposite the front surface. The reflecting surface portion faces the back surface of the vibrating body with a gap therebetween. The vibrating body includes a connection portion and a vibration portion. The connection portion is connected to the vibrator. The vibration portion extends from an end portion of the connection portion opposite the vibrator side in a direction away from the reflecting surface portion while widening, and has the back surface facing the reflecting surface portion. The vibration portion extends from the connection portion in a linear manner while widening in diameter in a vertical cross section, and has a cylindrical shape. The periphery of the reflecting surface portion is located outside the vibration portion coaxially with the central axis of the vibration portion when viewed from a direction perpendicular to the reflecting surface portion. Let TD be the distance between the connection part and the reflecting surface part in the direction perpendicular to the reflecting surface part, θ be the angle between a virtual line parallel to the reflecting surface part and the back surface of the vibrating part in the above-mentioned longitudinal section, θ be the shortest distance between the periphery of the back surface at the tip of the vibrating part opposite the connection part and the periphery of the reflecting surface part, and λ be the wavelength of the vibration wave emitted from the vibrating part. In this case, the relationship of 0.78λ≦L≦1.19λ or 1.5λ≦L≦2.14λ is satisfied in the range of TD=0 and 35°≦θ≦55°. Effect of the Invention

[0007] According to the present invention, vibration waves with high sound pressure can be generated. [Brief description of the drawings]

[0008] [Figure 1] 1 is a vertical cross-sectional view showing a configuration of a vibration wave radiating device according to a first embodiment of the present invention. [Diagram 2] 2 is a plan view of the vibration wave radiating device of FIG. 1, as viewed in the direction of arrow II. [Diagram 3] 10 is a partial cross-sectional view showing a state in which the phase of a reflected wave of a vibration wave radiated from the rear surface of a vibration section changes depending on the size of a reflection surface section. FIG. [Figure 4] 1 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of the vibration wave radiating device according to the first embodiment of the present invention. [Diagram 5]4 is a graph showing a relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of the vibration wave radiating device according to the first embodiment of the present invention. [Figure 6] FIG. 11 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to a second embodiment of the present invention. [Figure 7] FIG. 11 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of a vibration wave radiating device according to a second embodiment of the present invention. [Figure 8] 10 is a graph showing a relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of a vibration wave radiating device according to a second embodiment of the present invention. [Figure 9] FIG. 11 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to a modified example of the second embodiment of the present invention. [Figure 10] FIG. 11 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to a third embodiment of the present invention. [Figure 11] FIG. 11 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of a vibration wave radiating device according to a third embodiment of the present invention. [Figure 12] 11 is a graph showing a relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of a vibration wave radiating device according to a third embodiment of the present invention. [Figure 13] FIG. 11 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to a fourth embodiment of the present invention. [Figure 14] 14 is a plan view of the vibration wave radiating device of FIG. 13 as viewed in the direction of the arrow XIV. [Figure 15] FIG. 11 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of a vibration wave radiating device according to a fourth embodiment of the present invention. [Figure 16] 11 is a graph showing a relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of a vibration wave radiating device according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, vibration wave radiating devices according to embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are given the same reference characters, and the description thereof will not be repeated.

[0010] (Embodiment 1) Fig. 1 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to a first embodiment of the present invention. Fig. 2 is a plan view of the vibration wave radiating device of Fig. 1, seen from the direction of an arrow II. As shown in Figs. 1 and 2, a vibration wave radiating device 100 according to the first embodiment of the present invention includes a vibrator 110, a vibrating body 120, and a reflecting surface portion 130.

[0011] The oscillator 110 generates vibration. In this embodiment, the oscillator 110 includes an electromechanical conversion element 111 and a vibration transmitter 112. The electromechanical conversion element 111 is made of a piezoelectric element, a magnetostrictive element, an electrostrictive element, or the like. The vibration transmitter 112 is made of metal or resin. The oscillator 110 has a cylindrical shape.

[0012] The transducer 110 may be, for example, a Langevin type transducer, a monomorph type transducer, or a bimorph type transducer, which is a transducer in which one or more electromechanical transducer elements and one or more other members are integrated together.

[0013] The vibrating body 120 is connected to the vibrator 110, and has a front surface 120f and a back surface 120b located closer to the vibrator 110 and opposite to the front surface 120f.

[0014] The connection part 121 is connected to the vibrator 110. In this embodiment, the connection part 121 has a cylindrical shape extending in a direction perpendicular to the reflecting surface part 130. However, the shape of the connection part 121 is not limited to a cylindrical shape, and may be a pin shape, a hemispherical shape, or the like.

[0015] The vibration part 122 has a back surface 120b that expands from the end of the connection part 121 on the opposite side to the vibrator 110 side and extends in a direction away from the reflection surface part 130, and faces the reflection surface part 130. The vibration part 122 has a cylindrical shape that expands in diameter linearly from the connection part 121 in a vertical cross section. That is, the vibration part 122 has a conical horn shape that is rotationally symmetric around the central axis C. The periphery 123 of the back surface 120b at the tip of the vibration part 122 on the opposite side to the connection part 121 side has a circular ring shape. The shape of the vibration part 122 is not limited to a conical horn, and may be any shape that forms an open space that propagates vibration waves between the back surface 120b of the vibration part 122 and the reflection surface part 130.

[0016] The material of the vibrating body 120 may be, for example, a metal such as an aluminum alloy, stainless steel, a nickel alloy, or a copper alloy, or a resin. The vibrating body 120 may be integrally formed of the same material as the member constituting the vibrator 110 or the reflecting surface portion 130, or may be a separate member connected to the member constituting the vibrator 110 or the reflecting surface portion 130.

[0017] The reflecting surface portion 130 faces the rear surface 120b of the vibrating body 120 with a gap therebetween. In this embodiment, the reflecting surface portion 130 is the surface of the vibrator 110 facing the vibrating body 120. Note that the reflecting surface portion 130 may be formed of a member separate from the vibrator 110. In this case, the material of the reflecting surface portion 130 may be, for example, a metal such as an aluminum alloy, stainless steel, a nickel alloy, or a copper alloy, or a resin.

[0018] 2, the periphery of the reflecting surface portion 130 is a circle located outside the vibrating portion 122 and coaxial with the central axis C of the vibrating portion 122 when viewed from a direction perpendicular to the reflecting surface portion 130. In other words, the radius of the periphery of the reflecting surface portion 130 is larger than the radius of the periphery of the vibrating portion 122. Note that the periphery of the reflecting surface portion 130 is not limited to a circle when viewed from a direction perpendicular to the reflecting surface portion 130.

[0019] Here, the mechanism by which the sound pressure of the vibration wave radiated from the vibration wave radiating device 100 changes depending on the relationship between the size of the vibration part 122 and the size of the reflecting surface part 130 will be described.

[0020] FIG. 3 is a partial cross-sectional view that illustrates a state in which the phase of a reflected wave of a vibration wave radiated from the rear surface of the vibrating portion changes depending on the size of the reflecting surface portion.

[0021] As shown in Fig. 3, when the vibrating body 120 vibrates, the vibrating part 122 swings as shown by the arrow 1. This causes a vibration wave U1 to be emitted upward in Fig. 3 from the front surface 120f of the vibrating part 122. A vibration wave U2 is emitted downward in Fig. 3 from the back surface 120b of the vibrating part 122. The vibration wave U2 is reflected by the reflecting surface part 130 and propagates upward in Fig. 3.

[0022] If the radius of the periphery of the reflecting surface portion 130 were smaller than the radius of the periphery of the vibrating portion 122, the vibration wave U2 would not be reflected by the reflecting surface portion 130 and would not be able to propagate sufficiently upward in FIG.

[0023] On the other hand, when the radius of the periphery of the reflecting surface portion 130 is larger than the radius of the periphery of the vibrating portion 122, a shift occurs in the phase of the reflected wave depending on the distance the vibration wave U2 takes to reach the reflecting surface portion 130. The reflected waves U3 and U5 shown in FIG. 3 are in phase with the vibration wave U1, and the reflected wave U4 is in opposite phase to the vibration wave U1. Due to interference between these reflected waves, the reflected wave may not propagate sufficiently upward in FIG. 3. That is, in order to improve the sound pressure of the vibration wave radiated from the vibration wave radiating device, it is necessary to appropriately set the size of the reflecting surface portion 130 in accordance with the size of the vibrating portion 122.

[0024] Specifically, when the position of the periphery of the reflecting surface portion 130 is set to S1, it is possible to increase the sound pressure of the vibration wave radiated from the vibration wave radiating device by the reflected wave U3. When the position of the periphery of the reflecting surface portion 130 is set to S2, the reflected wave U4 is added to weaken the vibration wave radiated from the vibration wave radiating device, and the sound pressure of the vibration wave cannot be increased. When the position of the periphery of the reflecting surface portion 130 is set to S3, it is possible to increase the sound pressure of the vibration wave radiated from the vibration wave radiating device by adding the reflected wave U5. In this way, when the reflecting surface portion 130 becomes larger, regions where the vibration waves reinforce each other and regions where the vibration waves weaken each other are generated alternately.

[0025] Hereinafter, a description will be given of a simulation analysis result using the finite element method for the vibration wave radiating device according to the first embodiment of the present invention. In the following simulation analysis, the sound speed of air is set to 340 m / s.

[0026] 4 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of the vibration wave radiating device according to the first embodiment of the present invention. In the vertical cross-section shown in FIG. 4, the direction parallel to the reflecting surface portion 130 is defined as the X-axis direction, and the direction perpendicular to the reflecting surface portion 130 is defined as the Y-axis direction.

[0027] R1 is the radius of vibrator 110, that is, the radius of the periphery of reflecting surface portion 130. R2 is the inner radius of connecting portion 121. R3 is the radius of the periphery of back surface 120b at the tip of vibrating portion 122.

[0028] The thickness of electromechanical conversion element 111 is T1. The thickness of vibration transmitter 112 is T2. The height of connection portion 121 is T3. The height of rear surface 120b of vibration portion 122 in the Y-axis direction is T4.

[0029] The thickness of connecting portion 121 is defined as W1. The width in the X-axis direction of back surface 120b of vibrating portion 122 is defined as W2. The thickness of vibrating portion 122 is defined as W3. The distance in the X-axis direction between periphery 123 of back surface 120b at the tip of vibrating portion 122 on the side opposite to connecting portion 121 and the periphery of reflecting surface portion 130 is defined as W4.

[0030] The distance between the connection portion 121 and the reflection surface portion 130 in the Y-axis direction is defined as TD. In the vertical cross section shown in Fig. 4, the angle between the imaginary line VL parallel to the reflection surface portion 130 and the back surface 120b of the vibration portion 122 is defined as θ. The shortest distance between the periphery 123 of the back surface 120b at the tip of the vibration portion 122 on the side opposite to the connection portion 121 side and the periphery of the reflection surface portion 130 is defined as L. The wavelength of the vibration wave emitted from the vibration portion 122 is defined as λ.

[0031] A simulation analysis was performed for the cases where R1 was used as a parameter, TD=0, and the angle θ was 35°, 45°, and 55° in the range of 5.4 mm≦R1≦15 mm (0 mm≦W4≦7 mm).

[0032] Other dimensions were as follows: R2 = 3.5 mm, R3 = 5.6 mm, T1 = 0.4 mm, T2 = 13 mm, W1 = 0.6 mm, W2 = 1.5 mm, W3 = 0.6 mm. T3 + T4 = 2.2 mm, and the values ​​of T3 and T4 were appropriately adjusted according to the value of the angle θ. For example, R2 may be 0 mm or more and 10 mm or less. T1 may be 0.1 mm or more and 5 mm or less. T2 may be 0.1 mm or more and 30 mm or less. T3 may be 0 mm or more and 15 mm or less. T4 may be 0.2 mm or more and 10 mm or less. W1 may be 0.1 mm or more and 10 mm or less. W2 may be 0.2 mm or more and 10 mm or less. W3 may be 0.1 mm or more and 5 mm or less. It is preferable that the shortest distance (T3+T4) between the periphery 123 of the back surface 120b at the tip of the vibration portion 122 opposite the connection portion 121 side and the reflecting surface portion 130 satisfies the relationship 0.5λ≦T3+T4≦0.9λ.

[0033] A piezoelectric element was used as the electromechanical conversion element 111. The material of each of the vibration transmitter 112 and the vibrator 120 was an aluminum alloy (A7075).

[0034] A voltage of 2 Vpp, which is a frequency of 114 kHz (λ=2.98 mm), was applied to the piezoelectric body to drive the vibrator 110. In the vibration wave radiation device according to the first embodiment of the present invention, the maximum sound pressure of the vibration wave was calculated at a position 50 mm away from the tip of the vibrator 120 in the Y-axis direction on the central axis C before driving.

[0035] Fig. 5 is a graph showing the relationship between sound pressure per unit vibration velocity and the shortest distance L in a simulation analysis of the vibration wave radiating device according to the first embodiment of the present invention. In Fig. 5, the vertical axis shows sound pressure per unit vibration velocity (Pa / (m / s)), and the horizontal axis shows the shortest distance L (mm).

[0036] As shown in Fig. 5, in all cases where the angle θ is 35°, 45°, and 55°, the sound pressure per unit vibration velocity fluctuates periodically with respect to the shortest distance L. This is because the state of interference between reflected waves changes depending on the size of the reflecting surface portion 130. In order to increase the sound pressure per unit vibration velocity, it is preferable to satisfy the following conditions.

[0037] When the angle θ=35°, it is preferable to satisfy the relationship of 0.75λ≦L≦1.19λ or 1.47λ≦L. It is more preferable to satisfy the relationship of 1.65λ≦L≦1.96λ or 2.14λ≦L.

[0038] When the angle θ=45°, it is preferable to satisfy the relationship of 0.78λ≦L≦1.3λ or 1.5λ≦L. It is more preferable to satisfy the relationship of 0.84λ≦L≦1.19λ or 1.65λ≦L≦1.89λ.

[0039] When the angle θ=55°, it is preferable that the relationship 0.74λ≦L≦2.14λ is satisfied, and it is more preferable that the relationship 0.75λ≦L≦2.08λ is satisfied.

[0040] From the above simulation analysis results, in order to increase the sound pressure per unit vibration velocity in the vibration wave radiating device according to the first embodiment of the present invention, it is preferable to satisfy the relationship of 0.78λ≦L≦1.19λ or 1.5λ≦L≦2.14λ in the range of TD=0 and 35°≦θ≦55°. Furthermore, from the viewpoint of preventing the vibration wave radiating device from becoming large, it is preferable to satisfy the relationship of 0.78λ≦L≦1.19λ or 1.5λ≦L≦2λ in the range of TD=0 and 35°≦θ≦55°.

[0041] (Embodiment 2) Hereinafter, a vibration wave radiating device according to a second embodiment of the present invention will be described with reference to the drawings. The vibration wave radiating device according to the second embodiment of the present invention differs from the vibration wave radiating device 100 according to the first embodiment of the present invention mainly in the configurations of the vibrator and the vibrating body, and therefore the description of the configurations similar to those of the vibration wave radiating device 100 according to the first embodiment of the present invention will not be repeated.

[0042] 6 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to embodiment 2 of the present invention. As shown in FIG 6, a vibration wave radiating device 200 according to embodiment 2 of the present invention includes a vibrator 210, a vibrating body 220, and a reflecting surface portion 230.

[0043] In this embodiment, the vibrator 210 includes a first electromechanical transducer 211, a second electromechanical transducer 212, a first vibration transmitter 213, a second vibration transmitter 214, a third vibration transmitter 215, and a support 216. The vibrator 210 is a so-called Langevin type vibrator. The vibrator 210 has a substantially cylindrical shape. The support 216 protrudes in a disk shape from the outer circumferential surface of the vibrator 210. Note that the support 216 may protrude from the outer circumferential surface of the vibrator 210, and the shape of the support 216 is not limited to a disk shape. In addition, the support 216 is not limited to protruding from the entire circumference of the outer circumferential surface of the vibrator 210, and may protrude from a part of the outer circumferential surface of the vibrator 210.

[0044] The first electromechanical conversion element 211, the first vibration transmission body 213, and the third vibration transmission body 215 are laminated in this order on one surface of the support 216. The second electromechanical conversion element 212 and the second vibration transmission body 214 are laminated in this order on the other surface of the support 216.

[0045] Each of the first electromechanical conversion element 211 and the second electromechanical conversion element 212 is made of a piezoelectric element, a magnetostrictive element, an electrostrictive element, etc. Each of the first vibration transmission body 213, the second vibration transmission body 214, and the third vibration transmission body 215 is made of a metal or a resin. The support body 216 is made of a metal or a resin.

[0046] The vibrating body 220 is connected to the vibrator 210, and has a front surface 220f and a back surface 220b located closer to the vibrator 210 and opposite to the front surface 220f.

[0047] The connection part 221 is connected to the transducer 210. In this embodiment, the connection part 221 has a cylindrical shape extending in a direction perpendicular to the reflecting surface part 230. However, the shape of the connection part 221 is not limited to a cylindrical shape, and may be a pin shape, a hemispherical shape, or the like.

[0048] The vibration part 222 has a back surface 220b that extends from the end of the connection part 221 opposite to the vibrator 210 side in a direction away from the reflection surface part 230 while expanding, and faces the reflection surface part 230. The vibration part 222 has a cylindrical shape in a longitudinal section, extending from the connection part 221 toward the surface 220f side while expanding in a convex arc shape or elliptical arc shape. That is, the vibration part 222 has a trumpet shape that is rotationally symmetric about the central axis C. The periphery 223 of the back surface 220b at the tip of the vibration part 222 opposite to the connection part 221 side has a circular ring shape. The shape of the vibration part 222 is not limited to a trumpet shape, and may be any shape that forms an open space that propagates vibration waves between the back surface 220b of the vibration part 222 and the reflection surface part 230.

[0049] The material of the vibrating body 220 may be, for example, a metal such as an aluminum alloy, stainless steel, a nickel alloy, or a copper alloy, or a resin. The vibrating body 220 may be integrally formed of the same material as the member constituting the vibrator 210 or the reflecting surface portion 230, or may be a separate member connected to the member constituting the vibrator 210 or the reflecting surface portion 230.

[0050] Reflecting surface portion 230 faces rear surface 220b of vibrating body 220 with a gap therebetween. In this embodiment, reflecting surface portion 230 is the surface of vibrator 210 facing vibrating body 220. Note that reflecting surface portion 230 may be formed of a member separate from vibrator 210. In this case, the material of reflecting surface portion 230 may be, for example, a metal such as an aluminum alloy, stainless steel, nickel alloy, or copper alloy, or a resin.

[0051] The periphery of the reflecting surface portion 230 is a circle located outside the vibrating portion 222 and coaxial with the central axis C of the vibrating portion 222 when viewed from a direction perpendicular to the reflecting surface portion 230. That is, the radius of the periphery of the reflecting surface portion 230 is larger than the radius of the periphery of the vibrating portion 222. Note that the periphery of the reflecting surface portion 230 is not limited to a circle when viewed from a direction perpendicular to the reflecting surface portion 230.

[0052] Hereinafter, a description will be given of a simulation analysis result using the finite element method for the vibration wave radiating device according to the second embodiment of the present invention.

[0053] 7 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of the vibration wave radiating device according to the embodiment 2 of the present invention. In the vertical cross-section shown in FIG 7, the direction parallel to the reflecting surface portion 230 is the X-axis direction, and the direction perpendicular to the reflecting surface portion 230 is the Y-axis direction.

[0054] The radius of vibrator 210, i.e., the radius of the periphery of reflecting surface portion 230, is R1. The inner radius of connecting portion 221 is R2. The radius of the periphery of back surface 220b at the tip of vibrating portion 222 is R3. The radius of the periphery of support 216 is R4.

[0055] The thickness dimension of vibrator 210 is T10. The thickness dimension of second vibration transmitter 214 is T11. The thickness dimension of second electromechanical conversion element 212 is T12. The thickness dimension of support 216 is T13. The thickness dimension of first electromechanical conversion element 211 is T14. The thickness dimension of first vibration transmitter 213 is T15. The thickness dimension of third vibration transmitter 215 is T16.

[0056] The height dimension of connecting portion 221 is T3. The height dimension of rear surface 220b of vibrating portion 222 in the Y-axis direction is T4.

[0057] The thickness dimension of connecting portion 221 is defined as W1. The width dimension in the X-axis direction of back surface 220b of vibrating portion 222 is defined as W2. The thickness dimension of vibrating portion 222 is defined as W3. The distance dimension in the X-axis direction between periphery 223 of back surface 220b at the tip of vibrating portion 222 on the side opposite to connecting portion 221 and the periphery of reflecting surface portion 230 is defined as W4.

[0058] The dimension of the interval between the connection part 221 and the reflection surface part 230 in the Y-axis direction is TD. In the vertical section shown in FIG. 7, the angle between the virtual line VL parallel to the reflection surface part 230 and the straight line CL connecting the tip and the base of the back surface 220b of the vibration part 222 is θ. The aspect ratio of the back surface 220b of the vibration part 222 in the vertical section shown in FIG. 7 is AR. The relationship AR=W2 / T4 is satisfied. The dimension of the shortest distance between the periphery 223 of the back surface 220b at the tip of the vibration part 222 on the opposite side to the connection part 221 side and the periphery of the reflection surface part 230 is L. The wavelength of the vibration wave emitted from the vibration part 222 is λ.

[0059] Using R1 as a parameter, a simulation analysis was performed for the cases where TD=0 and T4 was 0.5 mm, 0.75 mm, 1 mm, 1.6 mm, and 1.79 mm in the range of 5.7 mm≦R1≦13 mm (0 mm≦W4≦7.3 mm).

[0060] Other dimensions were R2 = 3.5 mm, R3 = 5.7 mm, R4 = R1 + 2 mm, T11 = 5 mm, T12 = 0.4 mm, T13 = 0.5 mm, T14 = 0.4 mm, T15 = 5 mm, T16 = 1 mm, W1 = 0.6 mm, W2 = 1.6 mm, and W3 = 0.6 mm. T3 + T4 = 1.8 mm, and the value of T3 was appropriately adjusted according to the value of T4. When T4 changes from 0.5 mm to 1.79 mm, the angle θ changes from 17.4° to 48.2°.

[0061] Also, for example, R2 may be 0 mm or more and 10 mm or less. T11 may be 0.1 mm or more and 30 mm or less. T12 may be 0.1 mm or more and 5 mm or less. T13 may be 0.1 mm or more and 5 mm or less. T14 may be 0.1 mm or more and 5 mm or less. T15 may be 0.1 mm or more and 30 mm or less. T16 may be 0.1 mm or more and 5 mm or less. T3 may be 0 mm or more and 15 mm or less. T4 may be 0.2 mm or more and 10 mm or less. W1 may be 0.1 mm or more and 10 mm or less. W2 may be 0.2 mm or more and 10 mm or less. W3 may be 0.1 mm or more and 5 mm or less. It is preferable that the shortest distance (T3+T4) between the periphery 223 of the back surface 220b at the tip of the vibration portion 222 opposite the connection portion 221 side and the reflecting surface portion 230 satisfies 0.5λ≦T3+T4≦0.9λ.

[0062] A piezoelectric element was used as each of the first electromechanical conversion element 211 and the second electromechanical conversion element 212. The material of each of the first vibration transmission body 213, the second vibration transmission body 214, and the support body 216 was a nickel alloy (42Ni). The material of each of the third vibration transmission body 215 and the vibration body 220 was an aluminum alloy (A7075).

[0063] A voltage of 2 Vpp, which is a frequency of 114.1 kHz (λ=2.98 mm), was applied to the piezoelectric body to drive the vibrator 210. In the vibration wave radiation device according to the second embodiment of the present invention, the maximum sound pressure of the vibration wave was calculated at a position 50 mm away from the tip of the vibrator 220 in the Y-axis direction on the central axis C before driving.

[0064] Fig. 8 is a graph showing the relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of the vibration wave radiating device according to the second embodiment of the present invention. In Fig. 8, the vertical axis shows sound pressure per unit vibration velocity (Pa / (m / s)), and the horizontal axis shows shortest distance L (mm).

[0065] As shown in Fig. 8, in all cases where T4 was between 0.5 mm and 1.79 mm, the sound pressure per unit vibration velocity fluctuated periodically with respect to the shortest distance L. In order to increase the sound pressure per unit vibration velocity, it is preferable to satisfy the following conditions.

[0066] When T4 is 1 mm or more and 1.79 mm or less, it is preferable to satisfy the relationship 0.63λ≦L.

[0067] When T4 is 1.79 mm, it is preferable to satisfy the relationship of 0.68λ≦L≦1.15λ or 1.38λ≦L. It is more preferable to satisfy the relationship of 0.68λ≦L≦1.03λ, 1.5λ≦L≦1.88λ or 2.26λ≦L.

[0068] When T4 is 1.6 mm, it is preferable that the relationship of 0.68λ≦L≦1.03λ, 1.5λ≦L≦1.88λ, or 2.26λ≦L is satisfied.

[0069] When T4 is 1 mm, it is preferable to satisfy the relationship of 0.63λ≦L≦2λ or 2.26λ≦L. Also, it is more preferable to satisfy the relationship of 0.68λ≦L≦1.03λ or 1.5λ≦L≦1.75λ.

[0070] When T4 is 0.75 mm, it is preferable to satisfy the relationship 0.6λ≦L, and it is more preferable to satisfy the relationship 0.63λ≦L≦2λ.

[0071] When T4 is 0.5 mm, it is preferable to satisfy the relationship 0.83λ≦L. Also, it is more preferable to satisfy the relationship 0.92λ≦L≦1.26λ or 1.75λ≦L.

[0072] From the above simulation analysis results, in order to increase the sound pressure per unit vibration velocity in the vibration wave radiating device according to the second embodiment of the present invention, it is preferable to satisfy the relationship 0.83λ≦L in the range of TD=0 and 0.9≦AR≦3.2. Also, from the viewpoint of preventing the vibration wave radiating device from becoming large, it is preferable to satisfy the relationship 0.83λ≦L≦2λ in the range of TD=0 and 0.9≦AR≦3.2.

[0073] The vibration wave radiating device may be housed in a housing. Fig. 9 is a vertical cross-sectional view showing a configuration of a vibration wave radiating device according to a modification of the second embodiment of the present invention. As shown in Fig. 9, the vibration wave radiating device 200a according to the modification of the second embodiment of the present invention further includes a housing 240, an electrode 250, and a wiring 260.

[0074] The housing 240 contains the vibrator 210, the vibrating body 220, and the reflecting surface portion 230. The top surface of the housing 240 is open. The top surface of the housing 240 may be covered with a mesh structure through which vibration waves can pass. An electrode 250 is drawn out from the bottom surface of the housing 240. The electrode 250 is electrically connected to the vibrator 210 through a wiring 260. The configuration of this modified example may be applied to the vibration wave radiating device according to the other embodiment.

[0075] (Embodiment 3) Hereinafter, a vibration wave radiating device according to a third embodiment of the present invention will be described with reference to the drawings. The vibration wave radiating device according to the third embodiment of the present invention differs from the vibration wave radiating device 100 according to the first embodiment of the present invention mainly in the configurations of the vibrator and the reflecting surface portion, and therefore the description of the configurations similar to those of the vibration wave radiating device 100 according to the first embodiment of the present invention will not be repeated.

[0076] 10 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to embodiment 3 of the present invention. As shown in FIG 10, a vibration wave radiating device 300 according to embodiment 3 of the present invention includes a vibrator 310, a vibrating body 120, and a reflecting surface portion 330.

[0077] In this embodiment, the oscillator 310 includes an electromechanical transducer 111 and a vibration transmitter 312. The vibration transmitter 312 is made of metal or resin. The oscillator 310 has a cylindrical shape.

[0078] The reflecting surface portion 330 faces the back surface 120b of the vibrating body 120 with a gap therebetween. In this embodiment, the reflecting surface portion 330 is the surface of the flat plate 340, which is a separate member from the vibrator 310, on the vibrating body 120 side. The flat plate 340 has an annular shape and is arranged coaxially with the vibrator 310 so as to surround the vibrator 310. The flat plate 340 and the vibrator 310 may be in contact with each other or may be spaced apart from each other. The material of the flat plate 340 may be, for example, a metal such as an aluminum alloy, stainless steel, a nickel alloy, or a copper alloy, or a resin.

[0079] The periphery of the reflecting surface portion 330 is a circle located outside the vibrating portion 122 and coaxial with the central axis C of the vibrating portion 122 when viewed from a direction perpendicular to the reflecting surface portion 330. In other words, the radius of the periphery of the reflecting surface portion 330 is larger than the radius of the periphery of the vibrating portion 122. Note that the periphery of the reflecting surface portion 330 is not limited to a circle when viewed from a direction perpendicular to the reflecting surface portion 330.

[0080] Hereinafter, a description will be given of a simulation analysis result using the finite element method for the vibration wave radiating device according to the third embodiment of the present invention.

[0081] 11 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of a vibration wave radiating device according to embodiment 3 of the present invention. In the vertical cross-section shown in FIG. 11, the direction parallel to reflecting surface portion 330 is defined as the X-axis direction, and the direction perpendicular to reflecting surface portion 330 is defined as the Y-axis direction.

[0082] The radius of vibrator 310 is R1. The inner radius of connecting portion 121 is R2. The radius of the periphery of back surface 120b at the tip of vibrating portion 122 is R3. The radius of the periphery of reflecting surface portion 330 is R4.

[0083] The thickness of electromechanical conversion element 111 is T1. The thickness of vibration transmitter 312 is T2. The height of connection portion 121 is T3. The height of rear surface 120b of vibration portion 122 in the Y-axis direction is T4. The thickness of flat plate 340 is T5.

[0084] The thickness of connecting portion 121 is defined as W1. The width in the X-axis direction of back surface 120b of vibrating portion 122 is defined as W2. The thickness of vibrating portion 122 is defined as W3. The distance in the X-axis direction between periphery 123 of back surface 120b at the tip of vibrating portion 122 on the side opposite to connecting portion 121 and the periphery of reflecting surface portion 130 is defined as W4.

[0085] The distance between the connection portion 121 and the reflection surface portion 330 in the Y-axis direction is defined as TD. In the vertical cross section shown in Fig. 11, the angle between the imaginary line VL parallel to the reflection surface portion 330 and the back surface 120b of the vibration portion 122 is defined as θ. The shortest distance between the periphery 123 of the back surface 120b at the tip of the vibration portion 122 on the side opposite to the connection portion 121 side and the periphery of the reflection surface portion 330 is defined as L. The wavelength of the vibration wave emitted from the vibration portion 122 is defined as λ.

[0086] Using R4 and TD as parameters, a simulation analysis was performed for TD of 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, and 1.1 mm in the range of 5.4 mm≦R4≦15 mm (0 mm≦W4≦7 mm).

[0087] Other dimensions are as follows: R1 = 4.1 mm, R2 = 3.5 mm, R3 = 5.6 mm, T1 = 0.4 mm, T2 = 7.6 mm, T3 = 0.1 mm, T4 = 1.5 mm, T5 = 1 mm, W1 = 0.6 mm, W2 = 1.5 mm, W3 = 0.6 mm. Angle θ is 45°. The shortest distance (T3 + T4 + TD) between rim 123 of back surface 120b at the tip of vibration section 122 on the side opposite to connection section 121 and reflection surface section 330 preferably satisfies 0.5λ ≦ T3 + T4 + TD ≦ 0.9λ.

[0088] A piezoelectric element was used as the electromechanical conversion element 111. The material of each of the vibration transmitter 312 and the vibrator 120 was an aluminum alloy (A7075). The material of the flat plate 340 was ABS resin. The flat plate 340 and the vibrator 310 were slightly spaced from each other, so that the flat plate 340 did not vibrate.

[0089] A voltage of 2 Vpp, which is a frequency of 116.6 kHz (λ=3.01 mm), was applied to the piezoelectric body to drive the vibrator 310. In the vibration wave radiation device according to the third embodiment of the present invention, the maximum sound pressure of the vibration wave was calculated at a position 50 mm away from the tip of the vibrator 120 in the Y-axis direction on the central axis C before driving.

[0090] Fig. 12 is a graph showing the relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of a vibration wave radiating device according to a third embodiment of the present invention. In Fig. 12, the vertical axis shows sound pressure per unit vibration velocity (Pa / (m / s)), and the horizontal axis shows shortest distance L (mm).

[0091] As shown in Fig. 12, in all cases where TD was from 0.1 mm to 1.1 mm, the sound pressure per unit vibration velocity fluctuated periodically with respect to the shortest distance L. In order to increase the sound pressure per unit vibration velocity, it is preferable to satisfy the following conditions.

[0092] When TD is 0.1 mm, it is preferable to satisfy the relationship 1.01λ≦L≦1.3λ or 1.81λ≦L≦2.07λ.

[0093] When TD is 0.3 mm, it is preferable to satisfy the relationship of 0.85λ≦L≦1.28λ or 1.64λ≦L≦2.16λ, and it is more preferable to satisfy the relationship of 1λ≦L≦1.16λ or 1.83λ≦L≦1.9λ.

[0094] When TD is 0.5 mm, it is preferable to satisfy the relationship of 0.8λ≦L≦1.31λ or 1.55λ≦L. It is more preferable to satisfy the relationship of 0.87λ≦L≦1.2λ or 1.67λ≦L≦1.99λ.

[0095] When TD is 0.7 mm, it is preferable to satisfy the relationship of 0.79λ≦L≦1.3λ or 1.52λ≦L. It is more preferable to satisfy the relationship of 0.86λ≦L≦1.19λ or 1.7λ≦L≦2.01λ.

[0096] When TD is 0.9 mm, it is preferable that the relationship of 0.86λ≦L≦1.25λ, 1.56λ≦L≦2.04λ, or 2.36λ≦L is satisfied.

[0097] When TD is 1.1 mm, it is preferable to satisfy the relationship 0.93λ≦L≦1.15λ or 1.66λ≦L≦1.83λ.

[0098] From the above simulation analysis results, in order to increase the sound pressure per unit vibration velocity in the vibration wave radiating device of embodiment 3 of the present invention, it is preferable to satisfy the relationship 1.01λ≦L≦1.15λ or 1.81λ≦L≦1.83λ in the range of θ=45° and 0.1≦TD≦1.1.

[0099] (Embodiment 4) Hereinafter, a vibration wave radiating device according to a fourth embodiment of the present invention will be described with reference to the drawings. The vibration wave radiating device according to the fourth embodiment of the present invention differs from the vibration wave radiating device 300 according to the third embodiment of the present invention mainly in the configurations of the vibrator and the reflecting surface portion, and therefore the description of the configurations similar to those of the vibration wave radiating device 300 according to the third embodiment of the present invention will not be repeated.

[0100] Fig. 13 is a vertical cross-sectional view showing the configuration of a vibration wave radiating device according to a fourth embodiment of the present invention. Fig. 14 is a plan view of the vibration wave radiating device of Fig. 13 as seen from the direction of arrow XIV. As shown in Figs. 13 and 14, a vibration wave radiating device 400 according to the fourth embodiment of the present invention includes a vibrator 410, a vibrating body 420, and a reflecting surface portion 430.

[0101] In this embodiment, oscillator 410 includes electromechanical conversion element 411 and vibration transmitter 412. Oscillator 410 has a rectangular prism shape.

[0102] Vibrating body 420 is connected to vibrator 410, and has front surface 420f and back surface 420b located closer to vibrator 410 and opposite front surface 420f.

[0103] The connection portion 421 is connected to the transducer 410. In this embodiment, the connection portion 421 has a pair of plate shapes that face each other at a distance while extending in a direction perpendicular to the reflecting surface portion 430. However, the shape of the connection portion 421 is not limited to a pair of plates, and may be a single plate shape.

[0104] The pair of vibration parts 422 extend from the end of the connection part 421 opposite to the vibrator 410 side in a direction away from the reflection surface part 430 while being spaced apart from each other, and have a back surface 420b facing the reflection surface part 430. The pair of vibration parts 422 extend from the connection part 421 while being inclined so as to be spaced apart from each other in the vertical section, and are positioned line-symmetrical with each other about the central axis C. As shown in FIG. 14, the pair of vibration parts 422 have a rectangular shape arranged with a gap between them when viewed from a direction perpendicular to the reflection surface part 430. That is, the pair of vibration parts 422 have a pair of rectangular plate shapes that face each other diagonally with a gap between them.

[0105] Edges 423 of back surfaces 420b at the tips of pair of vibrating parts 422 on the side opposite to connecting part 421 extend in the form of two straight lines. Note that the shape of pair of vibrating parts 422 is not limited to a pair of rectangular plates, and may be any shape that forms an open space between back surfaces 420b of pair of vibrating parts 422 and reflecting surface part 430 for propagating vibration waves.

[0106] The material of the vibrating body 420 may be, for example, a metal such as an aluminum alloy, stainless steel, a nickel alloy, or a copper alloy, or a resin. The vibrating body 420 may be integrally formed of the same material as the member constituting the vibrator 410 or the reflecting surface portion 430, or may be a separate member connected to the member constituting the vibrator 410 or the reflecting surface portion 430.

[0107] The reflecting surface portion 430 faces the back surface 420b of the vibrating body 420 with a gap therebetween. In this embodiment, the reflecting surface portion 430 is a surface of a pair of flat plates 440, which are separate members from the vibrator 410, on the vibrating body 420 side. Each of the pair of flat plates 440 has a rectangular shape. The pair of flat plates 440 are arranged to sandwich the vibrator 410 between them. The pair of flat plates 440 and the vibrator 410 may be in contact with each other or may be spaced apart from each other. The material of the pair of flat plates 440 may be, for example, a metal such as an aluminum alloy, stainless steel, a nickel alloy, or a copper alloy, or a resin.

[0108] The periphery of the reflecting surface portion 430 is a pair of rectangles surrounding each of the pair of vibrating portions 422 from the outside when viewed from a direction perpendicular to the reflecting surface portion 430. Specifically, an edge 431 on the side opposite to the vibrator 410 side of the reflecting surface portion 430 is located outside an edge 423 of the back surface 420b at the tip of each of the pair of vibrating portions 422 when viewed from a direction perpendicular to the reflecting surface portion 430.

[0109] Hereinafter, a description will be given of a simulation analysis result using the finite element method for the vibration wave radiating device according to the fourth embodiment of the present invention.

[0110] 15 is a vertical cross-sectional view showing dimensional conditions for a simulation analysis of the vibration wave radiating device according to the fourth embodiment of the present invention. In the vertical cross-section shown in FIG. 15, the direction parallel to the reflecting surface portion 430 is defined as the X-axis direction, and the direction perpendicular to the reflecting surface portion 430 is defined as the Y-axis direction.

[0111] Let R1 be half the width of vibrator 410. Let R2 be the shortest distance in the X-axis direction from central axis C to connecting portion 421. Let R3 be the shortest distance in the X-axis direction from central axis C to edge 423 of back surface 420b at the tip of vibrating portion 422. Let R4 be the shortest distance in the X-axis direction from central axis C to edge 431 of reflecting surface portion 430 on the side opposite to vibrator 410.

[0112] The thickness of electromechanical conversion element 111 is T1. The thickness of vibration transmitter 412 is T2. The height of connection portion 421 is T3. The height of rear surface 420b of vibration portion 422 in the Y-axis direction is T4. The thickness of flat plate 440 is T5.

[0113] The thickness of connecting portion 421 is defined as W1. The width in the X-axis direction of back surface 420b of vibrating portion 422 is defined as W2. The thickness of vibrating portion 422 is defined as W3. The distance in the X-axis direction between edge 423 of back surface 420b at the tip of vibrating portion 422 opposite to connecting portion 421 and edge 431 of reflecting surface portion 430 opposite to vibrator 410 is defined as W4.

[0114] TD is the distance between connection portion 421 and reflecting surface portion 430 in the Y-axis direction. In the vertical cross section shown in Fig. 15, θ is the angle between imaginary line VL parallel to reflecting surface portion 430 and back surface 420b of vibrating portion 422. L is the shortest distance between edge 423 of back surface 420b at the tip of vibrating portion 422 on the side opposite to connection portion 421 and edge 431 of reflecting surface portion 430 on the side opposite to oscillator 410. λ is the wavelength of the vibration wave emitted from vibrating portion 422.

[0115] Using R4 and TD as parameters, a simulation analysis was performed for TD of 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, and 2.2 mm in the range of 5.4 mm≦R4≦15 mm (0 mm≦W4≦7 mm).

[0116] Other dimensions were as follows: R1 = 4 mm, R2 = 3 mm, R3 = 5.2 mm, T1 = 0.4 mm, T2 = 7.6 mm, T3 = 0.2 mm, T4 = 1.2 mm, T5 = 1 mm, W1 = 1 mm, W2 = 1.2 mm, W3 = 1 mm. Angle θ was 45°. The shape of vibration wave radiating device 400 was a three-dimensional shape in which the planar shape shown in FIG. 15 extended 16 mm in the depth direction of the paper. It is preferable that the shortest distance (T3 + T4 + TD) between edge 423 of back surface 420b at the tip of vibration part 422 on the opposite side to connection part 421 side and reflection surface part 430 satisfies 0.65λ ≦ T3 + T4 + TD ≦ 0.74λ.

[0117] A piezoelectric element was used as the electromechanical conversion element 411. The material of each of the vibration transmitter 412 and the vibrator 420 was an aluminum alloy (A7075). The material of the flat plate 440 was ABS resin. The flat plate 440 and the vibrator 410 were slightly spaced from each other, so that the flat plate 440 did not vibrate.

[0118] A voltage of 2 Vpp, which is a frequency of 79 kHz (λ=4.3 mm), was applied to the piezoelectric body to drive the vibrator 410. In the vibration wave radiation device according to the fourth embodiment of the present invention, the maximum sound pressure of the vibration wave was calculated at a position 50 mm away from the tip of the vibrator 420 in the Y-axis direction on the central axis C before driving.

[0119] Fig. 16 is a graph showing the relationship between sound pressure per unit vibration velocity and shortest distance L in a simulation analysis of a vibration wave radiating device according to embodiment 4 of the present invention. In Fig. 16, the vertical axis shows sound pressure per unit vibration velocity (Pa / (m / s)), and the horizontal axis shows shortest distance L (mm).

[0120] As shown in Fig. 16, in all cases where TD was from 1.4 mm to 2.2 mm, the sound pressure per unit vibration velocity fluctuated periodically with respect to the shortest distance L. In order to increase the sound pressure per unit vibration velocity, it is preferable to satisfy the following conditions.

[0121] When TD is 1.4 mm, it is preferable to satisfy the relationship of 0.65λ≦L, and it is more preferable to satisfy the relationship of 0.8λ≦L≦1.29λ or 1.67λ≦L≦2.05λ.

[0122] When TD is 1.6 mm, it is preferable to satisfy the relationship of 0.7λ≦L, and it is more preferable to satisfy the relationship of 0.81λ≦L≦1.2λ or 1.68λ≦L≦1.89λ.

[0123] When TD is 1.8 mm, it is preferable that the relationship 0.74λ≦L≦1.26λ or 1.54λ≦L is satisfied.

[0124] When TD was 2 mm and 2.2 mm, there was no area where the sound pressure could be increased. From the above simulation analysis results, in order to increase the sound pressure per unit vibration velocity in the vibration wave radiating device according to the fourth embodiment of the present invention, it is preferable to satisfy the relationship of 0.74λ≦L≦1.26λ or 1.54λ≦L in the range of θ=45° and 1.4≦TD≦1.8. Furthermore, from the viewpoint of preventing the vibration wave radiating device from becoming large, it is preferable to satisfy the relationship of 0.74λ≦L≦1.26λ or 1.54λ≦L≦2λ in the range of θ=45° and 1.4≦TD≦1.8.

[0125] In the above description of the embodiments, configurations that can be combined may be combined with each other.

[0126] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0127] 100, 200, 200a, 300, 400 vibration wave radiating device, 110, 210, 310, 410 vibrator, 111, 411 electromechanical conversion element, 112, 312, 412 vibration transmission body, 120, 220, 420 vibration body, 120b, 220b, 420b back surface, 120f, 220f, 420f surface, 121, 221, 421 connection portion, 122, 222, 422 vibration portion, 123, 223 periphery, 130, 230, 330, 430 reflection surface portion, 211 first electromechanical conversion element, 212 second electromechanical conversion element, 213 first vibration transmission body, 214 second vibration transmission body, 215 third vibration transmission body, 216 support, 240 housing, 250 Electrodes, 260 Wiring, 340, 440 Plates, 423, 431 Edges.

Claims

1. A vibrator that generates vibrations; a vibrating body connected to the vibrator and having a front surface and a back surface located near the vibrator and opposite to the front surface; a reflecting surface portion formed of a single plane facing the rear surface of the vibrating body with a gap therebetween, The vibrating body is A connection portion connected to the transducer; a vibration section that extends from an end of the connection section opposite to the vibrator side in a direction away from the reflection surface section while widening, and has a back surface facing the reflection surface section, the vibration portion has a cylindrical shape in a longitudinal section, the cylindrical shape extending from the connection portion while expanding in a linear manner, a periphery of the reflection surface portion is located outside the vibration portion and coaxially with a central axis of the vibration portion when viewed from a direction perpendicular to the reflection surface portion, a distance TD between the end of the connection portion on the transducer side and the reflection surface portion in a direction perpendicular to the reflection surface portion; In the longitudinal section, an angle between a virtual line parallel to the reflecting surface portion and the rear surface of the vibration portion is defined as θ; The shortest distance between the periphery of the back surface at the tip of the vibration portion on the opposite side to the connection portion side and the periphery of the reflection surface portion is defined as L, If the wavelength of the vibration wave emitted from the vibration unit is λ, then A vibration wave radiating device that satisfies the relationship 0.78λ≦L≦1.19λ or 1.5λ≦L≦2.14λ within the range of TD=0 and 35°≦θ≦55°.

2. 2. The vibration wave radiating device according to claim 1, wherein the relationship 0.78λ≦L≦1.19λ or 1.5λ≦L≦2λ is satisfied within the range of TD=0 and 35°≦θ≦55°.

3. A vibrator that generates vibrations; a vibrating body connected to the vibrator and having a front surface and a back surface located near the vibrator and opposite to the front surface; a reflecting surface portion facing the rear surface of the vibrating body with a gap therebetween, The vibrating body is A connection portion connected to the transducer; a vibration section that extends from an end of the connection section opposite to the vibrator side in a direction away from the reflection surface section while widening, and has a back surface facing the reflection surface section, the vibration portion has a cylindrical shape in a longitudinal section, the diameter of which is increased from the connection portion toward a front surface side in a convex arc shape or an elliptical arc shape, a periphery of the reflection surface portion is located outside the vibration portion and coaxially with a central axis of the vibration portion when viewed from a direction perpendicular to the reflection surface portion, a distance TD between the end of the connection portion on the transducer side and the reflection surface portion in a direction perpendicular to the reflection surface portion; The aspect ratio of the rear surface of the vibration portion in the longitudinal section is AR, The shortest distance between the periphery of the back surface at the tip of the vibration portion on the opposite side to the connection portion side and the periphery of the reflection surface portion is defined as L, If the wavelength of the vibration wave emitted from the vibration unit is λ, then A vibration wave radiating device that satisfies the relationship 0.83λ≦L in the range of TD=0 and 0.9≦AR≦3.

2.

4. 4. The vibration wave radiating device according to claim 3, wherein the relationship 0.83λ≦L≦2λ is satisfied in the range of TD=0 and 0.9≦AR≦3.

2.

5. A vibrator that generates vibrations; a vibrating body connected to the vibrator and having a front surface and a back surface located near the vibrator and opposite to the front surface; a reflecting surface portion facing the rear surface of the vibrating body with a gap therebetween, The vibrating body is A connection portion connected to the transducer; a vibration section that extends from an end of the connection section opposite to the vibrator side in a direction away from the reflection surface section while widening, and has a back surface facing the reflection surface section, the vibration portion has a cylindrical shape in a longitudinal section, the cylindrical shape extending from the connection portion while expanding in a linear manner, a periphery of the reflection surface portion is located outside the vibration portion and coaxially with a central axis of the vibration portion when viewed from a direction perpendicular to the reflection surface portion, a distance TD between the end of the connection portion on the transducer side and the reflection surface portion in a direction perpendicular to the reflection surface portion; In the longitudinal section, an angle between a virtual line parallel to the reflecting surface portion and the rear surface of the vibration portion is defined as θ; The shortest distance between the periphery of the back surface at the tip of the vibration portion on the opposite side to the connection portion side and the periphery of the reflection surface portion is defined as L, If the wavelength of the vibration wave emitted from the vibration unit is λ, then A vibration wave radiating device that satisfies the relationship 1.01λ≦L≦1.15λ or 1.81λ≦L≦1.83λ within the range of θ=45° and 0.1 mm≦TD≦1.1 mm.

6. A vibrator that generates vibrations; a vibrating body connected to the vibrator and having a front surface and a back surface located near the vibrator and opposite to the front surface; a reflecting surface portion facing the rear surface of the vibrating body with a gap therebetween, The vibrating body is A connection portion connected to the transducer; a pair of vibration sections extending from an end of the connection section opposite to the vibrator side in a direction away from the reflection surface section while being spaced apart from each other, the pair of vibration sections having a back surface facing the reflection surface section, the pair of vibration parts extend inclined away from each other from the connection part in a longitudinal section and are positioned symmetrically with respect to a central axis, the periphery of the reflection surface portion is a pair of rectangles that surround each of the pair of vibration portions from the outside when viewed from a direction perpendicular to the reflection surface portion, a distance TD between the end of the connection portion on the transducer side and the reflection surface portion in a direction perpendicular to the reflection surface portion; In the longitudinal section, an angle between a virtual line parallel to the reflecting surface portion and the rear surfaces of the pair of vibration portions is defined as θ; L is the shortest distance between an edge of the back surface at the tip end of the pair of vibration parts on the opposite side to the connection part side and an edge of the reflection surface part facing the back surface on the opposite side to the transducer side, If the wavelength of the vibration wave emitted from the pair of vibration parts is λ, then A vibration wave radiating device that satisfies the relationship 0.74λ≦L≦1.26λ or 1.54λ≦L within the range of θ=45° and 1.4 mm≦TD≦1.8 mm.

7. 7. The vibration wave radiating device according to claim 6, wherein, within the range of θ=45° and 1.4 mm≦TD≦1.8 mm, a relationship of 0.74λ≦L≦1.26λ or 1.54λ≦L≦2λ is satisfied.

Images