KR20230077022A - Acoustic wave transmission structure - Google Patents

Abstract

One embodiment of the present invention provides an acoustic wave transmission structure capable of easily generating a required broadband bandwidth through multiple resonances. Here, the acoustic wave transmission structure is formed in a three-dimensional shape and includes a unit structure cell having a pillar part formed in an area corresponding to a side and a space part formed in an inner area surrounded by the pillar part. A plurality of unit structure cells are provided and continuously arranged along a first direction through which acoustic waves are transmitted and a second direction crossing the first direction. The acoustic wave transmission structure is divided into a central portion formed within a certain distance from the central axis and an edge portion provided at a position farther from the central portion with respect to the central axis, and among a plurality of unit structure cells, the unit structure cell disposed in the central portion and the edge portion The arranged unit structure cells are different from each other.

Description

Acoustic wave transmission structure {ACOUSTIC WAVE TRANSMISSION STRUCTURE}

The present invention relates to an acoustic wave transmission structure, and more particularly, to an acoustic wave transmission structure capable of easily generating a required broadband bandwidth through multiple resonances.

The acoustic transducer for detecting the position of a target using sound waves in the water converts the input electrical signal into an acoustic signal in the active mode, emits it in the water, and receives the signal reflected from the target and returns from the target in the passive mode. It serves to convert the emitted acoustic signal into an electrical signal.

In general, an acoustic transducer for transmitting a high-power sound wave uses a Tonpilz type transducer. Due to the Tonfilz-type acoustic transducer, in which the length changes in the longitudinal direction, a pressure change occurs in the water as a medium, and sound waves are generated. This is because the ability to receive reflected sound waves is improved.

In general, a tonfilz-type transducer includes a piezoelectric element, a front weight disposed in front of the piezoelectric element to radiate the vibration of the piezoelectric element as an acoustic signal, and energy emitted when the front weight is disposed in the rear of the piezoelectric element and emits an acoustic signal. Includes a back vertebra that increases The tonepilz-type transducer can reduce the length of the piezoelectric body by using the front weight and the back weight in a specific frequency range to lower the electrical impedance, and the front weight and the back weight can act as a heat sink when driving with high power.

On the other hand, the mechanical characteristic impedance required for the front weight is a function of density and sound speed, and the sound speed is a function of density and modulus of elasticity. There is no commercial material that satisfies these characteristic impedances. Therefore, in order to match these characteristic impedances, conventionally, a method of properly mixing a fine spherical metal body with epoxy has been used. However, this method has problems in that it is difficult to implement homogeneous physical properties and productivity is low. In particular, in the case of multi-resonance tonepiltz transducers, configurations such as a front weight, passive compliant elements, and a plurality of central masses are required, resulting in complex configurations and shapes, as well as optimal Resonant frequency design also has a difficult problem.

Republic of Korea Patent Registration No. 1173937 (2012.08.14. Notice)

In order to solve the above problems, a technical problem to be achieved by the present invention is to provide an acoustic wave transmission structure capable of easily generating a required broadband bandwidth through multiple resonances.

The technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

In order to achieve the above technical problem, an embodiment of the present invention is a unit structure cell formed in a three-dimensional shape and having a column portion formed in a region corresponding to a side and a space portion formed in an inner region surrounded by the column portion. A plurality of unit structure cells are provided, continuously arranged along a first direction through which acoustic waves are transmitted and a second direction intersecting the first direction, and a central portion formed within a predetermined distance from the central axis; , It is divided into an edge portion provided at a position farther from the central portion with respect to the central axis, and among the plurality of unit structure cells, the unit structure cell disposed in the central portion and the unit structure cell disposed in the edge portion are different from each other. It provides an acoustic wave transmission structure to be.

In an embodiment of the present invention, the unit structure cell may be formed in a rectangular parallelepiped shape.

In an embodiment of the present invention, a cross-sectional area of the column part of the unit structural cell disposed in the central portion may be larger than a cross-sectional area of the column portion of the unit structural cell disposed in the edge portion.

In an embodiment of the present invention, the size of the unit structure cell disposed in the central portion and the unit structure cell disposed in the edge portion may be different from each other.

In an embodiment of the present invention, the first contact surface formed between the vibrating body disposed on one side may be formed in the form of a filled surface without forming an empty space.

In an embodiment of the present invention, the second contact surface formed between the external medium provided on the other side may be formed in the form of a filled surface without forming an empty space.

In an embodiment of the present invention, the unit structure cell may further have an auxiliary pillar portion disposed while connecting two spaced apart corners and crossing the space portion.

In an embodiment of the present invention, the unit structure cell may further have a plane portion formed by connecting two edges selected from each surface and the center of the space portion.

On the other hand, in order to achieve the above technical problem, one embodiment of the present invention is formed in a three-dimensional shape, having a pillar portion formed in an area corresponding to the side, and a space portion formed in an inner area surrounded by the pillar portion It includes a unit structure cell, and forms an intermediate scalpel disposed along a first direction in which acoustic waves are transmitted, a front weight, and a connecting rod connecting the intermediate scalpel and the front weight, wherein the intermediate scalpel, the connecting rod, and the front face The pendulum provides an acoustic wave transmission structure characterized in that the unit structure cells are continuously arranged along the first direction and a second direction crossing the first direction.

In an embodiment of the present invention, the unit structure cell may be formed in a rectangular parallelepiped shape.

In an embodiment of the present invention, the third contact surface formed between the intermediate scalpel and the vibrating body disposed on one side of the intermediate scalpel may be formed as a contact surface filled with no empty space.

In an embodiment of the present invention, the fourth contact surface formed between the front weight and the external medium provided on the other side of the front weight may be formed as a contact surface filled with no empty space.

In an embodiment of the present invention, the unit structure cell may further include an auxiliary pillar part disposed while crossing the space part while connecting two spaced corners to each other.

In an embodiment of the present invention, the unit structure cell may further have a plane portion formed by connecting two edges selected from each surface and the center of the space portion.

According to an embodiment of the present invention, the acoustic wave transmission structure is a shape of the acoustic wave transmission structure capable of implementing the required impedance, for example, the length and thickness of the column part of the unit structure cell, the volume of the space part, and the arrangement of the unit structure cells As long as the number of is calculated through theoretical calculation, it can be easily manufactured through 3D printing technology.

In addition, according to an embodiment of the present invention, the acoustic wave transmission structure can form different frequency bands, and through this, a broadband frequency acoustic wave having a bandwidth including two frequency bands can be generated. .

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is an exemplary view showing an example in which an acoustic wave transmitting structure according to a first embodiment of the present invention is installed in an underwater acoustic sensor.
2 is an exemplary view showing a part of an acoustic wave transmission structure according to a first embodiment of the present invention.
3 is an exemplary view showing another example of a part of an acoustic wave transmission structure according to a first embodiment of the present invention.
4 is an exemplary view for explaining that a wideband frequency is generated in the acoustic wave transmission structure according to the first embodiment of the present invention.
5 is an image showing tensile and compressive load characteristics of the acoustic wave transmission structure according to the first embodiment of the present invention.
6 is an exemplary view showing a first contact surface and a second contact surface of an acoustic wave transmitting structure according to a first embodiment of the present invention.
7 is an exemplary view showing another example of a unit structure cell of an acoustic wave transmitting structure according to a first embodiment of the present invention.
8 is a front view showing the unit structure cell of FIG. 7;
9 is an exemplary view showing another example of a unit structure cell of an acoustic wave transmitting structure according to a first embodiment of the present invention.
10 is a front view showing the unit structure cell of FIG. 9;
11 is an image showing elastic modulus characteristics of the acoustic wave transmitting structure of FIG. 9 .
12 is an exemplary view showing an example in which the acoustic wave transmitting structure according to the second embodiment of the present invention is installed in an underwater acoustic sensor.
13 is an exemplary diagram for explaining that a wideband frequency is generated in an acoustic wave transmission structure according to a second embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and, therefore, is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this is not only "directly connected", but also "indirectly connected" with another member in between. "Including cases where In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary view showing an example in which an acoustic wave transmission structure according to a first embodiment of the present invention is installed in an underwater acoustic sensor, and FIG. 2 is an example showing a part of the acoustic wave transmission structure according to the first embodiment of the present invention. It is also

As shown in FIGS. 1 and 2 , the acoustic wave transmitting structure 100 is provided on the front surface of the vibrating body 10 to transmit the vibration of the vibrating body 10 as acoustic waves. The vibrating body 10 may be a piezoelectric element, and the piezoelectric element may generate sound waves by vibrating when a voltage is applied, and convert the sound waves into electrical signals when receiving them. A rear weight 11 may be disposed on the rear surface of the vibrating body 10 .

The acoustic wave transmitting structure 100 may include a plurality of unit structure cells 110 and 120 . The unit structure cells 110 and 120 may be formed in a three-dimensional shape, preferably in a rectangular parallelepiped shape, and more preferably in a regular hexahedron shape.

Also, the plurality of unit structure cells 110 and 120 may be continuously arranged. Specifically, the unit structure cells 110 and 120 may be continuously arranged along the first direction A1 through which acoustic waves are transmitted. Also, the unit structure cells 110 may be continuously arranged along the second direction A2 crossing the first direction A1. The second direction A2 includes a 2-1 direction A2-1 and a 2-2 direction A2-2 perpendicular to each other so that the rectangular parallelepiped unit structural cells 110 and 120 can be continuously arranged. can do. The first direction A1, the 2-1 direction A2-1, and the 2-2 direction A2-2 may be perpendicular to each other, and through this, the plurality of unit structure cells 110 and 120 are formed in a three-dimensional can be arranged consecutively. The length of one side of the unit structural cells 110 and 120 may be as small as several to hundreds of μm, and thus, although the unit structural cells 110 and 120 are formed in a rectangular parallelepiped shape, the acoustic wave transmission structure 100 is formed in various shapes such as a cylindrical shape. It can be.

The acoustic wave transmission structure 100 may be partitioned into a central portion 101 and an edge portion 102 . The central portion 101 may be formed within a predetermined distance from the central axis CA, and the edge portion 102 may be provided at a position farther than the central portion 101 based on the central axis CA. The edge portion 102 may be continuously provided on the outer circumferential surface of the central portion 101 .

In addition, both the unit structure cells of the center portion 101 and the edge portion 102 may have a pillar portion and a space portion.

Referring to the unit structure cell 110 disposed in the central portion 101 , the pillar portion 111 may be formed in a region corresponding to a side of the unit structure cell 110 . Further, the space portion 112 may be formed in an inner region surrounded by the pillar portion 111 .

In addition, referring to the unit structure cell 120 disposed on the edge portion 102, the pillar portion 121 may be formed in a region corresponding to the side of the unit structure cell 120, and the space portion 122 may be a pillar portion 122. It may be formed in the inner region surrounded by the portion 121 . The unit structure cells 110 and 120 according to this embodiment may have a three-dimensional truss-lattice structure.

Among the plurality of unit structural cells 110 and 120 of the acoustic wave transmitting structure 100, the unit structural cell 110 disposed in the central portion 101 and the unit structural cell 120 disposed in the edge portion 102 may be different from each other. there is.

Specifically, the unit structure cell 110 disposed in the central portion 101 and the unit structure cell 120 disposed in the edge portion 102 may have different sizes. That is, as shown in FIG. 2 , the unit structure cell 110 disposed in the central portion 101 may be larger than the unit structure cell 120 disposed in the edge portion 102 .

And, FIG. 3 is an exemplary view showing another example of a part of the acoustic wave transmitting structure according to the first embodiment of the present invention. As shown in FIG. 3, the unit structure cell 110 disposed in the central portion 101 The cross-sectional area of the pillar portion 111 may be wider than that of the pillar portion 121a of the unit structure cell 120a disposed on the edge portion 102 . That is, the unit structure cell 110 disposed in the central portion 101 and the unit structure cell 120a disposed in the edge portion 102 are formed to have the same size, but the unit structure cell 110 disposed in the central portion 101 The pillar portion 111 of the may be thicker than the pillar portion 121a of the unit structure cell 120a disposed on the edge portion 102 .

Alternatively, in some cases, on the contrary, the unit structure cells disposed in the central portion 101 may be formed smaller than the unit structure cells disposed in the edge portion 102, and the pillar portion of the unit structure cells disposed in the central portion 101 It may be formed thinner than the column part of the unit structure cell disposed on the edge part 102 .

Through this, the unit structure cells 110 disposed in the central portion 101 and the unit structure cells 120 and 120a disposed in the edge portion 102 may have different densities, and thus, the central portion 101 and the edge portion 102 may have different densities. In the unit 102, different frequency bands may be formed. And, through this, it is possible to generate a broadband frequency acoustic wave having a bandwidth including two frequency bands.

4 is an exemplary view for explaining that a wideband frequency is generated in the acoustic wave transmission structure according to the first embodiment of the present invention.

As shown in FIG. 4, as the vibrating body 10 vibrates, primary resonance occurs in the acoustic wave transmission structure 100 and the rear weight 11 (see (a) in FIG. 4), and the first radiation is generated. The acoustic wave AW1 has, for example, a center frequency FC1, a first bandwidth BW1 between the first frequency F1 and the second frequency F2, and at the edge portion 102 2 When differential resonance occurs (see (b) in FIG. 4) and the radiated second acoustic wave AW2 slightly mismatches with the first acoustic wave AW1, that is, for example, the second acoustic wave AW2 has a center frequency (FC2) and has a second bandwidth (BW2) between the third frequency (F3) and the fourth frequency (F4), between the first frequency (F1) and the fourth frequency (F4) A wideband band BW3 may be generated (see (c) of FIG. 4). Acoustic waves of a broadband frequency, generated through multiple resonances, can help achieve the effect of widening the detection range of a submarine, for example.

The acoustic wave transmission structure 100 may be manufactured using 3D printing technology, and through this, the boundary between the central portion 101 and the edge portion 102 is naturally connected, so that the central portion 101 and the edge portion 102 are formed. It can be manufactured integrally, and the acoustic wave transmission structure 100 can also be easily manufactured in various three-dimensional structures.

The acoustic wave transmitting structure 100 may be used as a front weight of a tonfilz-type ultrasonic sensor. As described above, since there is no commercial material that satisfies the mechanical characteristic impedance required for the front weight, a method of properly mixing a fine spherical metal body with epoxy is conventionally used to match the characteristic impedance. However, this method has problems in that it is difficult to implement homogeneous physical properties and productivity is low.

However, the acoustic wave transmitting structure 100 according to the present invention is a form of the acoustic wave transmitting structure 100 capable of implementing a required impedance, for example, the length of the pillar portions 111 and 121 of the unit structure cells 110 and 120 As long as the thickness, the volume of the space portions 112 and 122, and the number of arranged unit structure cells 110 and 120 are calculated through theoretical calculation, it can be easily manufactured through 3D printing technology. Through this, a front weight that can satisfy various required impedance conditions can be obtained in a customized manner. In particular, in order to implement the broadband performance of the Tonfilz-type ultrasonic sensor through multi-resonance, a plurality of frequency bands for realizing the bandwidth must be satisfied. It can also be manufactured to satisfy any amount, so it can be implemented as an acoustic wave transmission structure for a multi-resonance sensor.

5 is an image showing tensile and compressive load characteristics of the acoustic wave transmission structure according to the first embodiment of the present invention.

As shown in FIG. 5 , it can be seen that the unit structure cells 110 and 120 according to the present embodiment have a very high modulus of elasticity in the axial direction and high stiffness against tensile and compressive loads. Accordingly, the acoustic wave transmission structure 100 having the unit structural cells 110 and 120 can effectively perform in an environment where the influence of bending vibration of the front weight is small and the axial tensile and compressive loads are high.

6 is an exemplary view showing a first contact surface and a second contact surface of an acoustic wave transmitting structure according to a first embodiment of the present invention.

As shown in FIG. 6 , the acoustic wave transmitting structure 100 may have a first contact surface 113 in contact with the vibrating body 10 generating acoustic waves. Based on the traveling direction of sound generated from the vibrating body 10 , the first contact surface 113 may be a rear surface of the acoustic wave transmission structure 100 .

The first contact surface 113 is preferably formed in the form of a filled surface without forming an empty space. Through this, not only is there an effect of preventing compression deformation of the first contact surface 113, but also the acoustic wave transmission structure 100 and the vibrating body 10 can be more closely contacted, so the acoustic wave transmission structure 100 Vibration of the vibrating body 10 can be effectively transmitted as acoustic waves.

The first contact surface 113 is formed at the same height while connecting the pillars at the rear end of a plurality of unit structure cells disposed at a portion in contact with the vibrating body 10 in the acoustic wave transmission structure 100 (see FIG. 6). (a)), or may be formed to protrude more rearward than the pillar part at the rear end of the plurality of unit structure cells to have a thickness (see (b) of FIG. 6).

A fastening member (eg, a bolt) connecting the acoustic wave transmission structure 100 and the vibrator 10 may be directly coupled to the first contact surface 113 .

Also, the acoustic wave transmitting structure 100 may have second contact surfaces 114a and 114b formed on opposite sides of the first contact surface 113 and contacting an external medium. The second contact surfaces 114a and 114b may include a second contact surface 114a formed on the central portion 101 and a second contact surface 114b formed on the edge portion 102 . The second contact surfaces 114a and 114b may be front surfaces of the acoustic wave transmission structure 100 based on the traveling direction of the sound generated by the vibrating body 10 . And, the external medium may be water.

The second contact surfaces 114a and 114b are preferably formed in the form of filled surfaces in which empty spaces are not formed. Through this, the watertightness is improved, the radiation area is widened, the size of the axial displacement of the radiation surface can be increased, and the external medium can be more closely contacted, so that the radiated acoustic energy can be maximized and the acoustic wave transmission Acoustic waves emitted by the structure 100 can be effectively transmitted to an external medium. In addition, the second contact surfaces 114a and 114b may prevent foreign substances included in the external medium from being introduced into the acoustic wave transmission structure 100 .

The second contact surfaces 114a and 114b are formed at the same height while connecting the pillars at the front end of the plurality of unit structure cells disposed on the front surface of the acoustic wave transmission structure 100 (see (a) in FIG. 6). , or may be formed so as to protrude forward more than the pillar portion at the front end of the plurality of unit structural cells to have a thickness (see (b) of FIG. 6).

7 is an exemplary view showing another example of a unit structure cell of an acoustic wave transmission structure according to a first embodiment of the present invention, and FIG. 8 is a front view showing the unit structure cell of FIG. 7 .

As shown in FIGS. 7 and 8 , the unit structure cell 110a may further include an auxiliary pillar portion 115 . That is, the unit structure cell 110a may have a three-dimensional truss-lattice structure having auxiliary pillars 115 in the space 112 .

The auxiliary pillar portion 115 may be disposed while connecting two spaced apart corners and crossing the space portion 112 . Since the unit structural cell 110a can be reinforced in the diagonal direction by the auxiliary pillar part 115, the acoustic wave transmission structure 100a having the auxiliary pillar part 115 has reinforcement against shear force and bending load. It can be. The unit structure cell 110a of this type may be applied to both the central portion and the edge portion. However, it is not necessarily limited to this example, and the unit structure cell 110a of this type may be used in combination with the unit structure cells 110 and 120 of the type described in FIG. 2 . For example, the unit structure cell 110a having the auxiliary pillar part 115 is used for the central part 101, and the unit structure cell 120 without the auxiliary pillar part 115 can be used for the edge part 102. There will be. Alternatively, unit structure cells 120 without auxiliary pillar parts 115 may be used in the central portion 101 and unit structure cells 110a having auxiliary pillar parts 115 may be used in edge parts 102 .

9 is an exemplary view showing another example of a unit structure cell of an acoustic wave transmitting structure according to a first embodiment of the present invention, and FIG. 10 is a front view showing the unit structure cell of FIG. 9 .

As shown in FIGS. 9 and 10 , the unit structure cell 110b according to the present embodiment may further include a planar portion 116 .

The plane portion 116 may be formed by connecting two edges selected from each surface of the unit structure cell 110b and the center of the space portion. Accordingly, the unit structure cell 110b may have a three-dimensional plate-lattice structure.

FIG. 11 is an image showing the elastic modulus characteristics of the acoustic wave transmitting structure of FIG. 9. As shown in FIG. 11, the acoustic wave transmitting structure 100b including unit structure cells 110b has the same elasticity in all directions. can have coefficients. That is, since the acoustic wave transmission structure 100b including the unit structural cells 110b may have isotropic elasticity, it may have high stiffness against shear force or bending load.

Therefore, the acoustic wave transmitting structure 100b having such a unit structural cell 110b can stably perform even in an environment where a shear force is applied to the front weight or an environment where a bending vibration influence is greatly applied.

12 is an exemplary view showing an example in which an acoustic wave transmission structure according to a second embodiment of the present invention is installed in an underwater acoustic sensor, and FIG. 13 is a wideband frequency generation in the acoustic wave transmission structure according to a second embodiment of the present invention. It is an example diagram to explain what is going on. In the above-described first embodiment, the acoustic wave transmission structure is in the form of extending in the radial direction of the central axis, whereas the acoustic wave transmission structure of this embodiment is in the form of extending in the direction of the central axis, and the shape of the unit structure cell. Other configurations such as those of the first embodiment may be applied identically or identically, and descriptions of repetitive contents are omitted as much as possible.

12 and 13, the acoustic wave transmission structure 100c according to the present embodiment includes a middle scalpel 103 disposed along the first direction in which acoustic waves are transmitted, that is, the central axis CA direction, the front surface A connecting rod 105 connecting the weight 104 and the middle scalpel 103 and the front weight 104 may be formed. The middle scalpel 103, the connecting rod 105, and the front weight 104 may be configured by continuously arranging unit structure cells along a first direction and a second direction crossing the first direction. In addition, the middle scalpel 103, the connecting rod 105, and the front weight 104 may all be integrally formed.

As the vibrating body 10 vibrates, the connecting rod 105 and the front weight 104 disposed in the front centering on the intermediate scalpel 103 vibrate with the intermediate scalpel 103 and the rear weight 11 vibrate. Secondary resonance occurs (see (a) in FIG. 13), and the first acoustic wave AW1 is radiated, and the vibrating body 10 and the back weight 11 disposed at the rear around the middle scalpel 103 are centered at the middle. When the scalpel 103 vibrates and the front weight 104 vibrates, secondary resonance occurs (see FIG. 13(b)) and the second acoustic wave AW2 is radiated, the fifth frequency F5 and the sixth frequency A wideband band between frequencies F6 may be generated (see (c) of FIG. 13).

Of course, at least one type of unit structure cell among the unit structure cells described in FIGS. 2, 7, and 9 may be applied to the acoustic wave transmission structure 100c according to the present embodiment.

And, like the first contact surface 113 and the second contact surfaces 114a and 114b described in FIG. 6, formed between the intermediate scalpel 103 and the vibrating body 10 disposed on one side of the intermediate scalpel 103 The third contact surface 117 may be formed as a contact surface filled with no empty space. And, the fourth contact surface 118 formed between the front weight 104 and the external medium provided on the other side of the front weight 104 may be formed as a contact surface filled with no empty space, through which, The effects described in FIG. 6 may also be implemented in this embodiment.

In addition, the unit structure cells of the middle scalpel 103, the front weight 104, and the connecting rod 105 are all formed in the same size, each formed in a different size, or at least a portion formed in the same size. can be applied Density design of the unit structure cell may be appropriately performed in the process of designing the acoustic wave transmission structure 100c to implement the required impedance.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention.

10: vibrating body
11: rear weight
100, 100a, 100b, 100c: acoustic wave transmission structure
101: central part
102: edge
103: medium scalpel
104: front weight
105: connecting rod
110, 110a, 110b, 120: unit structure cell
111,121: column part
112,122: space part
113: first contact surface
114a, 114b: second contact surface
115: auxiliary pillar part
116: flat part
117: third contact surface
118: fourth contact surface formed

Claims (14)

A unit structure cell formed in a three-dimensional shape and having a pillar part formed in an area corresponding to a side and a space part formed in an inner area surrounded by the pillar part;
The unit structure cells are provided in plurality and are continuously arranged along a first direction through which acoustic waves are transmitted and a second direction crossing the first direction,
It is divided into a central portion formed within a certain distance from the central axis and an edge portion provided at a position farther than the central portion based on the central axis,
Among the plurality of unit structural cells, the unit structural cell disposed in the central portion and the unit structural cell disposed in the edge portion are different from each other. According to claim 1,
The acoustic wave transmission structure, characterized in that the unit structure cell is formed in a rectangular parallelepiped shape. According to claim 1,
A cross-sectional area of the pillars of the unit structural cells disposed in the central portion is larger than that of the pillars of the unit structural cells disposed in the edge portion. According to claim 1,
Acoustic wave transmission structure, characterized in that the size of the unit structure cell disposed in the central portion and the unit structure cell disposed in the edge portion are different from each other. According to claim 1,
The acoustic wave transmission structure, characterized in that the first contact surface formed between the vibrating body disposed on one side is formed in the form of a filled surface without forming an empty space. According to claim 1,
The acoustic wave transmission structure, characterized in that the second contact surface formed between the external medium provided on the other side is formed in the form of a filled surface without forming an empty space. According to claim 1,
The unit structure cell further comprises an auxiliary pillar portion connecting two spaced apart corners and crossing the space portion. According to claim 1,
The unit structure cell further comprises a planar portion formed by connecting two edges selected from each surface and the center of the space portion. A unit structure cell formed in a three-dimensional shape and having a column portion formed in a region corresponding to a side and a space portion formed in an inner region surrounded by the column portion;
An intermediate scalpel disposed along a first direction in which acoustic waves are transmitted, a front weight, and a connecting rod connecting the intermediate scalpel and the front weight,
The intermediate scalpel, the connecting rod, and the front weight are characterized in that the unit structure cells are continuously arranged along the first direction and a second direction crossing the first direction. According to claim 9,
The acoustic wave transmission structure, characterized in that the unit structure cell is formed in a rectangular parallelepiped shape. According to claim 9,
Acoustic wave transmission structure, characterized in that the third contact surface formed between the intermediate scalpel and the vibrating body disposed on one side of the intermediate scalpel is formed as a contact surface filled with no empty space. According to claim 9,
Acoustic wave transmission structure, characterized in that the fourth contact surface formed between the front weight and the external medium provided on the other side of the front weight is formed as a contact surface filled with no empty space. According to claim 9,
The unit structure cell further includes an auxiliary pillar portion disposed while crossing the space portion while connecting two spaced corners to each other. According to claim 9,
The unit structure cell further comprises a planar portion formed by connecting two edges selected from each surface and the center of the space portion.

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