Sound-dampening devices and sound-dampening masks

Abstract

To provide a sound-dampening device and a sound-dampening mask that maintain ease of speaking while also providing a sound-dampening effect. [Solution] The sound-dampening device 100 is a device for covering at least the mouth of the wearer, and includes an intake passage 26 for guiding outside air for mouth breathing to a first opening (through hole 12) provided in a first surface material (bottom 10a) which is a surface material facing the mouth, an exhaust passage 27 for exhausting exhaled air from mouth breathing through a second opening (exhaust hole 22) provided in a second surface material (bottom 20a) which is a surface material on the outer side of the device from the first surface material, a first check valve provided in the intake passage 26, and a second check valve provided in the exhaust passage 27, wherein the first check valve or the second check valve includes a rotating body (first rotating body 28, second rotating body 29) that rotates in a predetermined direction by the airflow generated with mouth breathing, and the rotating body is an impeller.

Description

Technical Field

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[0001] The present invention relates to a soundproofing device and a soundproofing mask.

Background Art

[0002] Conventionally, a mask that can reduce the volume leaking to the surroundings during a call in a public space or the like by having a soundproofing effect on the voice emitted from a person's mouth is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the mask described in Patent Document 1 does not have a ventilation path, and when trying to improve the soundproofing performance, exhaled air accumulates inside the mask, and there is a problem that the speaker feels difficulty in speaking when using the mask.

[0005] An object of the present invention is to provide a soundproofing device and a soundproofing mask that can maintain ease of speaking and obtain a soundproofing effect in view of such problems.

Means for Solving the Problems

[0006] To solve the above problems, the sound-dampening device of the present invention is a device for covering at least the mouth of the wearer, and comprises: an intake passage for guiding outside air for mouth breathing to a first opening provided in a first surface material which is a surface material facing the mouth; an exhaust passage for exhausting exhaled air from mouth breathing through a second opening provided in a second surface material which is a surface material on the outer side of the device from the first surface material; a first check valve provided in the intake passage; and a second check valve provided in the exhaust passage, wherein the first check valve or the second check valve includes a rotating body that rotates in a predetermined direction by the airflow generated with mouth breathing, and the rotating body is an impeller.

[0007] Furthermore, the sound-dampening device of the present invention is a device for covering at least the mouth of the wearer, and comprises: an intake passage for guiding outside air for mouth breathing to a first opening provided in a first surface material which is a surface material facing the mouth; an exhaust passage for exhausting exhaled air from mouth breathing through a second opening provided in a second surface material which is a surface material on the outer side of the device from the first surface material; a resonant silencer provided in at least one of the intake passage and the exhaust passage; a first check valve provided in the intake passage; and a second check valve provided in the exhaust passage, wherein the exhaust passage is connected to the second opening at one end and to the first opening at the other end, and the resonant silencer is installed in the intake passage on the side of the first opening that is closer to the installation position of the first check valve, or in the exhaust passage on the side of the first opening that is closer to the installation position of the second check valve.

[0008] Furthermore, the sound-dampening mask of the present invention comprises the sound-dampening device and a cover mask that covers at least the nose and mouth of the wearer. [Effects of the Invention]

[0009] According to the present invention, it is possible to maintain ease of speaking while also achieving a sound-dampening effect. [Brief explanation of the drawing]

[0010] [Figure 1]This figure shows an example of how to use the sound-dampening device according to this embodiment. [Figure 2] This is a perspective view showing the exterior of the sound-dampening device, including the positive Y-axis side. [Figure 3] This is a perspective view showing the external appearance of the protective section, including the negative Y-axis side. [Figure 4] This is a cross-sectional view of the sound-dampening unit when cut along the YZ plane passing through its center in the X-axis direction. [Figure 5] This is a schematic diagram of the inside of the sound-dampening unit as viewed from the positive X-axis direction. [Figure 6] This is a schematic diagram of the inside of the sound-dampening unit as viewed from the negative X-axis direction. [Figure 7] This is a schematic diagram of the inside of the sound-dampening unit as viewed from the positive Y-axis direction. [Figure 8] This is a schematic diagram of a Helmholtz resonator according to Modification 1. [Figure 9] This figure shows an example of using a sound-dampening mask according to Modification 2. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The sound-dampening device 100 according to this embodiment is worn so as to cover at least the user's mouth, as shown in Figure 1. The sound-dampening device 100 is equipped with a microphone 13 (see Figure 3) inside, and the microphone 13 collects sound. Therefore, the sound-dampening device 100 can collect sound using the microphone 13 so that the voice spoken by the user cannot be heard by people around them. For example, when conducting a remote meeting in an office or at home, the sound-dampening device 100 can reduce the possibility of the voice spoken by the user being heard by people around them, thereby preventing the content of the conversation from being known to people around them or causing discomfort to those around them. The sound-dampening device 100 may be held in the user's hand and worn so as to cover the user's mouth, or it may have a band or the like for attaching the sound-dampening device 100 to the user's head.

[0012] The sound-dampening device 100 comprises a protective part 10 and a sound-dampening unit 20. The protective part 10 is provided in the part of the sound-dampening device 100 that is attached to the user's mouth. The protective part 10 is made of various soft materials with relatively low hardness, such as silicone. As shown in Figures 2 and 3, the protective part 10 has a bottomed cylindrical shape, and its cross-section parallel to the XZ plane is elliptical.

[0013] As shown in Figure 4, the protective part 10 has a flat plate-shaped bottom portion 10a parallel to the XZ plane, and a mouth portion 10b that is positioned on the negative Y-axis side from the periphery of the bottom portion 10a and extends in the negative Y-axis direction, with the pipe diameter narrowing towards the negative Y-axis direction. The mouth portion 10b has an opening 11 at its end on the negative Y-axis side. The opening 11 is positioned to surround the user's mouth when the sound-dampening device 100 is attached to the user's mouth. In other words, when the sound-dampening device 100 is attached to the user's mouth, the user's mouth is positioned inside the opening 11 of the protective part 10 and covered by the sound-dampening device 100.

[0014] The bottom portion 10a is provided with a through-hole 12 that penetrates the bottom portion 10a in the Y-axis direction and communicates with the space 10c surrounded by the protective portion 10 to the space inside the sound-dampening unit 20. In Figure 4, the interior of the sound-dampening unit 20 is not shown. The through-hole 12 is positioned opposite the user's mouth when the user is wearing the sound-dampening device 100. In other words, the through-hole 12 is a first opening provided in the bottom portion 10a (first surface material), which is the surface material of the sound-dampening device 100 that faces the user's (wearer's) mouth. The bottom portion 10a is also provided with a microphone 13 for collecting sound, including the voice of the user wearing the sound-dampening device 100. The microphone 13 is connected to a signal processing circuit and a communication interface (IF) (not shown), and the processing results from the signal processing circuit may be transmitted to an external device via the communication interface.

[0015] The sound absorption unit 20 has a bottomed cylindrical shape with a bottom 20a, and an elliptical cross-section parallel to the XZ plane. The bottom 20a is substantially the same shape as the bottom 10a in the XZ plane. The end on the negative Y-axis side of the sound absorption unit 20 is connected to the bottom 10a of the protection unit 10.

[0016] The bottom 20a is provided with an intake hole 21 and an exhaust hole 22 that penetrate the bottom 20a in the Y-axis direction and communicate with the internal space of the sound absorption unit 20 from the external space of the sound absorption device 100. That is, the exhaust hole 22 is a second opening provided in the bottom 20a (second facing material), which is a facing material on the outer side of the sound absorption device 100 rather than the first facing material in the sound absorption device 100. The intake hole 21 is provided on the positive side in the X-axis direction and also on the positive side in the Z-axis direction with respect to the center in the X-axis direction on the bottom 20a. The exhaust hole 22 is provided at substantially the center in the X-axis direction and on the negative side in the Z-axis direction with respect to the center in the Z-axis direction on the bottom 20a. Note that the positions where the intake hole 21 and the exhaust hole 22 are provided on the bottom 20a are not limited to the above positions and may be provided at other positions on the bottom 20a.

[0017] As shown in FIGS. 5 to 7, the sound absorption unit 20 includes an intake passage 26, an exhaust passage 27, a first rotating body 28, a second rotating body 29, a first cylindrical portion 28a, and a second cylindrical portion 29a inside the housing. In FIGS. 5 and 6, portions other than the bottom 10a of the protection unit 10 are omitted.

[0018] The intake passage 26 is a hollow tube with a substantially circular internal cross-section, and includes a first intake passage 261 and a second intake passage 262. One end 261a of the first intake passage 261 is connected to the intake hole 21. The space inside the first intake passage 261 communicates with the space outside the silencer 100 through the intake hole 21. The other end 261b of the first intake passage 261 is connected to the first cylindrical portion 28a. One end 262a of the second intake passage 262 is connected to the first cylindrical portion 28a at a position other than the connection point between the other end 261b of the first intake passage 261 and the first cylindrical portion 28a. The other end 262b of the second intake passage 262 is connected to the through-hole 12. The space inside the second intake passage 262 communicates with the space 10c surrounded by the protection portion 10 through the through-hole 12.

[0019] The first cylindrical portion 28a has a cylindrical shape into which the first rotating body 28 can enter. An opening 28b is formed at the connection portion of the first cylindrical portion 28a with the other end 261b of the first intake passage 261, and an opening 28c is formed at the connection portion of the first cylindrical portion 28a with the one end 262a of the second intake passage 262. That is, the first cylindrical portion 28a is formed in a shape where the top surface portion and the bottom surface portion in the cylindrical shape are closed, and the inside of the first cylindrical portion 28a is configured to communicate with the outside of the first cylindrical portion 28a through the opening 28b or the opening 28c formed on the side surface in the cylindrical shape.

[0020] The exhaust passage 27 is a hollow tube with a circular internal cross-section, and includes a first exhaust passage 271 and a second exhaust passage 272. One end 271a of the first exhaust passage 271 is connected to the through-hole 12. The space inside the first exhaust passage 271 communicates with the space 10c surrounded by the protection portion 10 through the through-hole 12. The other end 271b of the first exhaust passage 271 is connected to the second cylindrical portion 29a. One end 272a of the second exhaust passage 272 is connected to the second cylindrical portion 29a at a position other than the connection point between the other end 271b of the first exhaust passage 271 and the second cylindrical portion 29a. The other end 272b of the second exhaust passage 272 is connected to the exhaust hole 22. The space inside the second exhaust passage 272 communicates with the space outside the silencer 100 through the exhaust hole 22.

[0021] The second cylindrical portion 29a has a cylindrical shape into which the second rotating body 29 can enter. The second cylindrical portion 29a has an opening 29b at the connection point with the other end 271b of the first exhaust passage 271, and an opening 29c at the connection point with one end 272a of the second exhaust passage 272. In other words, the second cylindrical portion 29a is formed in a shape where the top and bottom of the cylindrical shape are closed, and the inside of the second cylindrical portion 29a is configured to communicate with the outside of the second cylindrical portion 29a through the opening 29b or opening 29c formed on the side of the cylindrical shape.

[0022] The first rotating body 28 is an impeller and is housed inside the first cylindrical portion 28a. The first rotating body 28 comprises a rotating shaft 281 provided parallel to the Y-axis direction and a plurality of plate-shaped blades 282. The first rotating body 28 is rotatably supported by the rotating shaft 281 within the housing of the sound-dampening unit 20. A plurality of radially extending blades 282 are provided on the outer circumference of the rotating shaft 281 at equal intervals in the circumferential direction. Spaces 282a are formed between the blades 282. The first rotating body 28 is provided with a first restricting part (not shown) that allows rotation of the first rotating body 28 in direction A, which is counterclockwise in the example shown in Figure 7, but prevents rotation of the first rotating body 28 in the opposite direction to direction A. The first restricting part is, for example, a one-way clutch. The angle between the blade 282 and the first intake passage 261 is set such that the pressure of the air flowing into the first cylindrical section 28a through the opening 28b hitting the blade 282 makes it easier for the first rotating body 28 to rotate in direction A than in the opposite direction of direction A.

[0023] The second rotating body 29 is an impeller and is housed inside the second cylindrical portion 29a. The second rotating body 29 comprises a rotating shaft 291 provided parallel to the Y-axis direction and a plurality of plate-shaped blades 292. The second rotating body 29 is rotatably supported by the rotating shaft 291 within the housing of the sound-dampening unit 20. A plurality of radially extending blades 292 are provided on the outer circumference of the rotating shaft 291 at equal intervals in the circumferential direction. Spaces 292a are formed between the blades 292. The second rotating body 29 is provided with a second restricting part (not shown) that allows rotation of the second rotating body 29 in direction B, which is clockwise in the example shown in Figure 7, but prevents rotation of the second rotating body 29 in the opposite direction to direction B. The second restricting part is, for example, a one-way clutch. The angle formed by the blade 292 and the first exhaust passage 271 is set such that the second rotating body 29 is more likely to rotate in direction B than in the opposite direction of direction B due to the pressure exerted by the air flowing into the second cylindrical section 29a through the opening 29b hitting the blade 292.

[0024] When a user wearing the sound-dampening device 100 breathes through their mouth while speaking, for example, the air pressure inside the space 10c enclosed by the protective part 10 changes, and the airflow generated by the change in air pressure causes the first rotating body 28 to rotate in direction A and the second rotating body 29 to rotate in direction B. Specifically, air from outside the sound-dampening device 100 is drawn into the first intake passage 261 through the intake hole 21. The airflow drawn into the first intake passage 261 flows into the first cylindrical part 28a through the opening 28b and strikes the blades 282 of the first rotating body 28. The pressure from the airflow striking the blades 282 causes the first rotating body 28 to rotate in direction A. The air that flows in from the opening 28b is contained in the space 282a and is carried to the opening 28c as the first rotating body 28 rotates in direction A. Air flowing out from opening 28c reaches the space 10c surrounded by the protective part 10 via the second intake passage 262 and the through hole 12. Air blown out by the user's mouth breathing flows from the space 10c surrounded by the protective part 10 through the through hole 12 into the first exhaust passage 271. The airflow into the first exhaust passage 271 flows into the second cylindrical part 29a via opening 29b and strikes the blades 292 of the second rotating body 29. The pressure from the airflow striking the blades 292 causes the second rotating body 29 to rotate in direction B. Air flowing in from opening 29b is contained in space 292a and carried to opening 29c as the second rotating body 29 rotates in direction B. Air flowing out from opening 29c is released into the space outside the silencing device 100 via the second exhaust passage 272 and the exhaust hole 22. As a result, when the user breathes through their mouth while speaking with the protective part 10 tightly fitted around their mouth, they can draw in air from the space outside the sound-dampening device 100, and release the air blown out from the user's mouth into the space outside the sound-dampening device 100. Therefore, the difficulty of speaking while the user is wearing the sound-dampening device 100 can be reduced.

[0025] When a user wearing the sound-dampening device 100 breathes through their mouth, the first rotating body 28 functions as a first check valve that allows air to flow from the first inhalation passage 261 to the second inhalation passage 262, but prevents air from flowing in the opposite direction. The second rotating body 29 functions as a second check valve that allows air to flow from the first exhaust passage 271 to the second exhaust passage 272, but prevents air from flowing in the opposite direction.

[0026] Furthermore, when the sound-dampening device 100 is attached, the sound emitted by the user enters the first cylindrical section 28a through the through-hole 12, the second intake passage 262, and the opening 28c. In the first cylindrical section 28a, the incident sound is physically blocked by the vanes 282. Also, the sound emitted by the user enters the second cylindrical section 29a through the through-hole 12, the first exhaust passage 271, and the opening 29b. In the second cylindrical section 29a, the incident sound is physically blocked by the vanes 292, thus attenuating the sound that is emitted to the outside of the sound-dampening device 100 along with the air blown out by the user's mouth breathing through the opening 29c, the second exhaust passage 272, and the exhaust hole 22. As described above, when the sound-dampening device 100 is attached, ease of speaking is maintained by reducing the difficulty the user has in speaking, and a sound-dampening effect can be obtained by attenuating the sound emitted by the user.

[0027] [Differentiation] Next, modified examples of the present invention will be described. In the modified examples, the same reference numerals are used for components similar to those in the above embodiments, and their descriptions are omitted.

[0028] (Variation 1) In the sound-dampening device 100 of Modified Example 1, the first exhaust passage 271 is provided with a Helmholtz resonator 30 as shown in Figure 8. The sound-dampening device 100 of Modified Example 1 further reduces the sound emitted by the user by the Helmholtz resonator 30. The Helmholtz resonator 30 comprises a neck portion 31 and a resonant tube 32. The space inside the first exhaust passage 271 is in communication with the space inside the resonant tube 32 via the neck portion 31.

[0029] When the sound-dampening device 100 of Modified Example 1 is attached to the user's mouth and the user makes a sound, the sound enters the space inside the first exhaust passage 271 through the through hole 12. Then, a resonant sound corresponding to a wavelength corresponding to the volume of the resonant tube 32 is generated inside the resonant tube 32. At the end 31a of the neck portion 31 on the first exhaust passage 271 side, which is the joint between the first exhaust passage 271 and the neck portion 31, the sound that entered the neck portion 31 from the first exhaust passage 271 (incident sound) and the resonant sound generated inside the resonant tube 32 (emitted sound) interfere with each other, and a frequency sound corresponding to the volume of the resonant tube 32 is canceled out. As a result, at the other end 271b of the first exhaust passage 271, a sound with a frequency corresponding to the volume of the resonant tube 32 (resonant frequency) is emitted at a reduced volume. In other words, in the sound-dampening device 100 of Modified Example 1, the sound emitted by the user is emitted outside the sound-dampening device 100 with the frequency sound corresponding to the volume of the resonant tube 32 at a reduced volume.

[0030] (Modification 2) In modified example 2, the sound-dampening device 100 is fitted inside the cover mask 200 and placed over the user's mouth, as shown in Figure 9. The cover mask 200 covers at least the user's nose and mouth. The sound-dampening device 100 and the cover mask 200 are collectively referred to as the sound-dampening mask 300. The sound-dampening mask 300, by incorporating a cover mask 200, can reduce the visual discomfort caused by wearing the sound-dampening device 100 over the mouth. If the cover mask 200 is made of a breathable material (mesh, non-woven fabric, etc.), comfort can be obtained when using the sound-dampening mask 300.

[0031] As described above, the sound-dampening device 100 according to this embodiment is a device for covering at least the mouth of the wearer, and comprises an intake passage 26 for guiding outside air for mouth breathing to a first opening (through hole 12) provided in a first surface material (bottom 10a) which is a surface material facing the mouth, an exhaust passage 27 for exhausting exhaled air from mouth breathing through a second opening (exhaust hole 22) provided in a second surface material (bottom 20a) which is a surface material on the outer side of the device from the first surface material, a first check valve provided in the intake passage 26, and a second check valve provided in the exhaust passage 27, wherein the first check valve or the second check valve includes a rotating body (first rotating body 28, second rotating body 29) that rotates in a predetermined direction by the airflow generated with mouth breathing, and the rotating body is an impeller. Therefore, when the user breathes through their mouth while speaking with the sound-dampening device 100 attached, they can draw in air from the space outside the sound-dampening device 100 and release the air blown out from their mouth into the space outside the sound-dampening device 100. Thus, the difficulty of speaking while the user is wearing the sound-dampening device 100 can be reduced. In addition, when the user is wearing the sound-dampening device 100, the sound emitted from the user is physically blocked by the blades 282 of the first rotating body 28 or the blades 292 of the second rotating body 29, and is therefore attenuated. This allows for maintaining ease of speaking while achieving a sound-dampening effect.

[0032] Furthermore, the sound-dampening device 100 according to this embodiment is a device for covering at least the mouth of the wearer, and includes an intake passage 26 for guiding outside air for mouth breathing to a first opening (through hole 12) provided in a first surface material (bottom 10a) which is the surface material facing the mouth, and an exhaust passage 27 for exhausting exhaled air from mouth breathing through a second opening (exhaust hole 22) provided in a second surface material (bottom 20a) which is the surface material on the outside side of the device from the first surface material, and provided in at least one of the intake passage 26 and the exhaust passage 27 The sound-dampening device 100 comprises a resonant silencer (Helmholtz resonator 30), a first check valve provided in the intake passage 26, and a second check valve provided in the exhaust passage 27. The exhaust passage 27 is connected to a second opening at one end (the other end 272b) and to a first opening at the other end (the other end 271a). The resonant silencer is installed in the intake passage 26 on the side of the first opening that is closer to the first check valve, or in the exhaust passage 27 on the side of the first opening that is closer to the second check valve. Therefore, when the user breathes through their mouth while speaking with the sound-dampening device 100 attached, they can draw in air from the space outside the sound-dampening device 100 and release the air blown out from the user's mouth into the space outside the sound-dampening device 100. Thus, the difficulty of speaking when the user is wearing the sound-dampening device 100 can be reduced. Furthermore, when the sound-dampening device 100 is attached, the voice emitted by the user is attenuated by the Helmholtz resonator 30. This maintains ease of speaking while improving the sound-dampening effect.

[0033] Furthermore, in the sound-dampening device 100 according to this embodiment, the first check valve or the second check valve includes a rotating body (first rotating body 28, second rotating body 29) that rotates in a predetermined direction due to the airflow generated by mouth breathing. The rotating body is an impeller. Therefore, when the sound-dampening device 100 is attached, the sound emitted by the user is physically blocked by the blades 282 of the first rotating body 28 or the blades 292 of the second rotating body 29, and thus attenuated. This makes it possible to more effectively reduce the sound emitted by the user.

[0034] In the sound-dampening device 100 according to this embodiment, a microphone 13 is provided inside the device. Therefore, the sound-dampening device 100 can be used when conducting remote meetings in an office or at home, and it can reduce the likelihood of the user's voice being heard by those around them. This makes it possible to prevent the content of conversations from being known to those around you, or to prevent causing discomfort to those around you.

[0035] The sound-dampening mask 300 according to this embodiment comprises a sound-dampening device 100 and a cover mask 200 that covers at least the nose and mouth of the wearer. Therefore, the cover mask 200 can conceal the sound-dampening device 100. This reduces the visual discomfort caused by wearing the sound-dampening device 100 in the mouth.

[0036] The above embodiments are provided as specific examples to facilitate understanding of the invention, and the present invention is not limited to these embodiments. Various modifications and changes are possible without departing from the spirit of the invention. For example, in the above embodiments and modifications, the first check valve is an impeller which is the first rotating body 28, and the second check valve is an impeller which is the second rotating body 29, but it is not limited to this. In the above modifications, since the sound emitted from the user can be attenuated by the Helmholtz resonator 30, the first check valve and the second check valve do not have to be impellers as long as they function as check valves. Also, in the above embodiments and modifications, one of the first check valve and the second check valve may be an impeller, and the other may be a check valve that is not an impeller. Also, in the above modifications of the embodiments, the Helmholtz resonator 30 is provided in the first exhaust passage 271, but it is not limited to this. The Helmholtz resonator 30 may be provided in the second intake passage 262 instead of the first exhaust passage 271. Alternatively, the Helmholtz resonator 30 may be provided in both the first exhaust passage 271 and the second intake passage 262. Furthermore, in the above embodiment and its modifications, the silencing device 100 is formed in a shape that covers the wearer's mouth while leaving the nose exposed, but the silencing device 100 may be formed in a shape that covers both the wearer's mouth and nose. In this case, the protective part 10 should be formed so that it surrounds both the wearer's mouth and nose. [Explanation of Symbols]

[0037] 100…Silencer, 10a…Bottom (first surface material), 12…Through hole (first opening), 20a…Bottom (second surface material), 22…Exhaust hole (second opening), 26…Intake passage, 27…Exhaust passage, 28…First rotating body, 29…Second rotating body, 30…Helmholtz resonator (resonant silencer)

Claims

1. A device for covering at least the mouth area of ​​the wearer, An intake passage for guiding outside air for mouth breathing is provided in the first surface material, which is the surface material facing the mouth, to the first opening, An exhaust passage for exhausting exhaled air from mouth breathing through a second opening provided in the second surface material, which is a surface material on the outer side of the device than the first surface material, A first check valve provided in the intake passage, A second check valve is provided in the exhaust passage, Equipped with, The first check valve or the second check valve includes a rotating body that rotates in a predetermined direction due to the airflow generated by the mouth breathing, The rotating body is an impeller, a sound-dampening device.

2. A device for covering at least the mouth area of ​​the wearer, An intake passage for guiding outside air for mouth breathing is provided in the first surface material, which is the surface material facing the mouth, to the first opening, An exhaust passage for exhausting exhaled air from mouth breathing through a second opening provided in the second surface material, which is a surface material on the outer side of the device than the first surface material, A resonant silencer provided in at least one of the intake passage and the exhaust passage, A first check valve provided in the intake passage, A second check valve is provided in the exhaust passage, Equipped with, The exhaust passage is connected to the second opening at one end and to the first opening at the other end. The resonance-type silencer is installed in the intake passage on the side of the first opening that is closer to the installation position of the first check valve, or in the exhaust passage on the side of the first opening that is closer to the installation position of the second check valve.

3. The sound-dampening device according to claim 2, wherein the first check valve or the second check valve includes a rotating body that rotates in a predetermined direction by the airflow generated in conjunction with mouth breathing.

4. The sound-dampening device according to claim 3, wherein the rotating body is an impeller.

5. The sound-dampening device according to claim 1 or 4, further comprising a microphone inside the device.

6. A sound-dampening device according to claim 1 or 4, A cover mask that covers at least the nose and mouth of the wearer, A sound-dampening mask equipped with these features.

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