mask

Abstract

To provide a mask that can sufficiently attenuate voice.SOLUTION: A mask 100 has a cover 102 covering a person's mouth. The cover 102 has an interior space formed inside, and the cover 102 has: an opening 104 to be worn over the person's mouth; bottom portions 121, 131, 141 partitioning the space into a plurality of air chambers including a first air chamber C1 and a second air chamber C2; and passages 123, 133, 143 connecting the plurality of air chambers. The first air chamber C1 is formed between the bottom portion 121 that divides the first air chamber C1 among the bottom portions 121, 131, 141, and the opening 104.SELECTED DRAWING: Figure 5

Description

Technical Field

[0007] ,

[0001] The present disclosure relates to a mask worn on a person's mouth.

Background Art

[0002] Patent Document 1 discloses a mask that can obtain an attenuation effect on sound emitted from a person's mouth.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, Patent Document 1 has a problem that the attenuation effect on sound is not sufficient.

[0005] An object of the present disclosure is to provide a mask that can sufficiently obtain an attenuation effect on sound.

Means for Solving the Problems

[0006] A mask according to an aspect of the present disclosure is a mask including a cover that covers a person's mouth, the cover having a space formed therein, the cover having an opening portion that is worn on the person's mouth, one or more partition portions that partition the space into a plurality of air chambers including a first air chamber and a second air chamber, and one or more passage portions that communicate the plurality of air chambers with each other, the first air chamber being formed between a first partition portion that partitions the first air chamber among the one or more partition portions and the opening portion.

Effects of the Invention

[0007] The mask according to the present disclosure can sufficiently obtain an attenuation effect on sound.

Brief Description of the Drawings

[0008] [Figure 1] Figure 1 shows an example of how to use the mask according to the embodiment. [Figure 2] Figure 2 is a perspective view showing the appearance of the mask, including the front. [Figure 3] Figure 3 is a perspective view showing the appearance of the mask, including the back. [Figure 4] Figure 4 is a side view of the mask as seen from the right side. [Figure 5] Figure 5 is a VV cross-sectional view of the mask in Figure 4. [Figure 6] Figure 6 is a cross-sectional view of the mask in Figure 5, taken from the line VI-VI. [Figure 7] Figure 7 is a cross-sectional view taken along line VII-VII, showing the passageway portion in Figure 5. [Figure 8] Figure 8 is a perspective view including a cross-section when the mask is cut along the XY plane. [Figure 9] Figure 9 is a perspective view including a cross-section when the mask is cut along the YZ plane passing through the passage. [Modes for carrying out the invention]

[0009] A mask according to one aspect of the present disclosure is a mask comprising a cover that covers a person's mouth, wherein the cover has a space formed inside, the cover has an opening that is fitted to the person's mouth, one or more partitions that divide the space into a plurality of air chambers including a first air chamber and a second air chamber, and one or more passages that connect the plurality of air chambers to each other, the first air chamber being formed between a first partition that partitions the first air chamber from among the one or more partitions and the opening.

[0010] According to this design, since the first and second air chambers are connected by a passage, sound emitted from a person's mouth in the first air chamber passes through the first air chamber, the passage, and then the second air chamber in that order. In other words, sound propagates from the wide space of the first air chamber, through the narrow space of the passage, and then from the passage to the wide space of the second air chamber. In this way, because the sound passes through a narrow space first, the attenuation effect of the sound can be improved.

[0011] Furthermore, at least one of the one or more passage sections may have a folded-over structure.

[0012] Therefore, the distance over which sound propagates in the passageway can be increased. Consequently, the sound pressure of voices emitted by people can be effectively reduced.

[0013] Furthermore, the folded structure may have a first portion extending in a first direction and a second portion communicating with the first portion and extending in the first direction, wherein the first portion and the second portion overlap each other in the first direction and are positioned at different locations in a second direction intersecting the first direction, the first portion communicating with the first air chamber at one end and the second portion at the other end, and the second portion communicating with the first portion at one end and the second air chamber at the other end.

[0014] Furthermore, the folded structure may have a first portion extending in a first direction and a second portion communicating with the first portion and extending in a second direction different from the first direction, wherein the first portion communicates with the first air chamber at one end and with the second portion at the other end, and the second portion communicates with the first portion at one end and with the second air chamber at the other end.

[0015] Furthermore, the volume of each of the multiple air chambers may be larger than the volume of each of the one or more passage sections.

[0016] Therefore, the sound emitted from the human mouth in the first air chamber that accommodates the human mouth passes through a passage portion that is smaller in volume than the first air chamber and the second air chamber when propagating from the first air chamber to the second air chamber, so that the sound pressure of the sound emitted from the human mouth can be effectively reduced.

[0017] Further, the plurality of air chambers further includes a third air chamber, and when the mask is worn on the mouth, they are arranged in the front-rear direction of the person, and a first passage portion that is the passage portion communicating the first air chamber and the second air chamber, and a second passage portion that is the passage portion communicating the second air chamber and the third air chamber may be arranged at non-overlapping positions when viewed from the front-rear direction.

[0018] According to this, since the inlet and outlet of the second air chamber are arranged so that their positions in the front-rear direction do not overlap, the distance through which sound propagates in the second air chamber can be increased. Therefore, the sound pressure of the sound inside the cover can be effectively reduced.

[0019] Further, the cover may further have a through-hole that communicates an air chamber arranged at the position farthest from the first air chamber among the plurality of air chambers and the space outside the cover.

[0020] For this reason, a person can discharge the air blown out from the human mouth to the space outside the mask in a state where the mask is closely attached around the mouth. That is, since the air blown out from the human mouth when the person is speaking can be discharged to the space outside the mask in a state where the person is wearing the mask, it is possible to make it easier to talk even when the person is wearing the mask.

[0021] Further, the cover further has a first wall portion that surrounds a portion of the first air chamber excluding the opening portion and the first partition portion, and a second wall portion that is arranged at an interval from the first wall portion and further surrounds the first wall portion, and the tubular space formed between the first wall portion and the second wall portion may be sealed.

[0022] This allows the first air chamber, where the sound pressure of the sound emitted from the person's mouth is higher than that of the other air chambers, to be enclosed by at least a space, thereby reducing sound leakage to the outside through the cylindrical portion of the first air chamber.

[0023] Furthermore, the cover may have sound-absorbing material placed in the plurality of air chambers.

[0024] This makes it possible to more effectively reduce the sound pressure of human-spoken voices.

[0025] Furthermore, the system may also include a microphone located within the first air chamber.

[0026] This allows a microphone to capture a person's voice while reducing the likelihood of that voice being heard by others around them.

[0027] A mask according to one aspect of the present invention will be described in detail below with reference to the drawings.

[0028] The embodiments described below are all specific examples of the present invention. The numerical values, shapes, materials, components, arrangement positions of components, and connection configurations shown in the following embodiments are examples only and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, those components that are not described in the independent claim representing the highest-level concept will be described as optional components.

[0029] (Embodiment) Figure 1 shows an example of how to use the mask according to the embodiment.

[0030] Mask 100 is worn over a person's mouth and covers it. Mask 100 is designed to reduce sound, including the voice of a person. Mask 100 may be equipped with a microphone and collect sound using the microphone. Therefore, Mask 100 can collect sound using the microphone so that people around the person's voice cannot hear what the person is saying. For example, when conducting remote meetings in an office or at home, Mask 100 can reduce the amount of sound a person makes that can be heard by people around them, thereby preventing the content of the conversation from being known to others or causing discomfort to those around them.

[0031] The mask 100 may be held by a person and placed over their mouth, or it may have a band for attaching it to a person's head.

[0032] Next, we will explain the configuration of mask 100.

[0033] Figure 2 is a perspective view showing the mask 100 including the front. Figure 3 is a perspective view showing the mask 100 including the rear. Figure 4 is a side view of the mask 100 as seen from the right side.

[0034] In Figures 2, 3, and 4, with the mask 100 worn, the X-axis direction is the left-right direction of the person, the Y-axis direction is the front-back direction of the person, and the Z-axis direction is the up-down direction of the person. Furthermore, the positive X-axis direction (the direction towards the tip of the arrow in the X-axis direction) is to the right of the person, the negative X-axis direction (the opposite direction of the positive X-axis direction) is to the left of the person, the positive Y-axis direction (the direction towards the tip of the arrow in the Y-axis direction) is in front of the person, the negative Y-axis direction (the opposite direction of the positive Y-axis direction) is behind the person, the positive Z-axis direction (the direction towards the tip of the arrow in the Z-axis direction) is up of the person, and the negative Z-axis direction (the opposite direction of the positive Z-axis direction) is down of the person.

[0035] The mask 100 comprises a cushion body 101 and a cover 102. The cushion body 101 is provided in the part that is worn over a person's mouth and has an annular shape with an opening 104. The opening 104 is positioned to surround a person's mouth when the mask 100 is worn over a person's mouth. In other words, when the mask 100 is worn over a person's mouth, the person's mouth is positioned within the opening 104 of the cushion body 101 and covered by the mask 100. The cover 102 has a through hole 103 on its front side. The through hole 103 communicates with the internal space of the cover 102 and communicates with the opening 104. Therefore, a person can release air blown from their mouth into the space outside the mask 100 while the cushion body 101 of the mask 100 is in close contact with the area around their mouth. In other words, when a person is wearing the mask 100 and speaking, the air blown out from the person's mouth can be released into the space outside the mask 100, making it easier for a person to speak even while wearing the mask 100.

[0036] Next, we will describe the detailed configuration of cover 102 of mask 100.

[0037] Figure 5 is a VV cross-sectional view of the mask 100 in Figure 4. Specifically, Figure 5 is a cross-sectional view obtained when the mask 100 is cut by the XY plane passing through the center in the vertical direction.

[0038] As shown in Figure 5, the cover 102 of the mask 100 comprises a cylindrical first member 110 and bottomed cylindrical second member 120, third member 130, fourth member 140, and fifth member 150. A microphone 160 is also positioned inside the cover 102 of the mask 100.

[0039] The first member 110 has a cylindrical first portion 111 extending in the Y-axis direction, and a second portion 112 extending in the Y-axis direction from the Y-axis negative end of the first portion 111, with a shape such that the diameter of the tube widens as it moves in the Y-axis negative direction. A cushion body 101 is connected to the Y-axis negative end of the first member 110, that is, the Y-axis negative end of the second portion 112. In addition, a second member 120 is connected to the Y-axis positive end of the first member 110, that is, the Y-axis positive end of the first portion 111.

[0040] The second member 120 has a flat bottom portion 121, a cylindrical portion 122 positioned in the negative Y-axis direction from the periphery of the bottom portion 121, and a passage portion 123 connected to a part of the bottom portion 121 on the negative X-axis side and a part of the cylindrical portion on the negative X-axis side. The end of the cylindrical portion 122 on the positive Y-axis side is connected to the bottom portion 121, and the end on the negative Y-axis side is connected to the positive Y-axis side of the first member 110. The specific configuration of the passage portion 123 will be described later.

[0041] The cushion body 101, the first member 110, and the cylindrical portion 122 of the second member 120 form an integrated cylindrical shape, and the front end is covered by the bottom portion 121 of the second member 120, forming a bottomed cylindrical shape. The cushion body 101, the first member 110, and the second member 120 are members formed to surround the first air chamber C1. In other words, the cushion body 101, the first member 110, and the second member 120 form the first air chamber C1.

[0042] The third member 130 has a flat bottom portion 131, a cylindrical portion 132 positioned in the negative Y-axis direction from the periphery of the bottom portion 131, and a passage portion 133 connected to a part of the bottom portion 131 on the positive X-axis side and a part of the cylindrical portion on the positive X-axis side. The end of the cylindrical portion 132 on the positive Y-axis side is connected to the bottom portion 131, and the end on the negative Y-axis side is connected to the end of the second member 120 on the positive Y-axis side. The specific configuration of the passage portion 133 will be described later. The third member 130 is formed together with the bottom portion 121 of the second member 120 to surround the second air chamber C2. In other words, the second member 120 and the third member 130 form the second air chamber C2.

[0043] The fourth member 140 has a flat bottom portion 141, a cylindrical portion 142 positioned on the negative Y-axis side from the periphery of the bottom portion 141, and a passage portion 143 connected to a part of the bottom portion 141 on the negative X-axis side and a part of the cylindrical portion on the negative X-axis side. The end of the cylindrical portion 142 on the positive Y-axis side is connected to the bottom portion 141, and the end on the negative Y-axis side is connected to the positive Y-axis side of the third member 130. The specific configuration of the passage portion 143 will be described later. The fourth member 140 is formed together with the bottom portion 131 of the third member 130 to surround the third air chamber C3. In other words, the third member 130 and the fourth member 140 form the third air chamber C3.

[0044] The first portion 111 of the first member 110 and the cylindrical portions 122, 132, and 142 form a single cylindrical shape. For example, the outer surface of the first portion 111 extended toward the positive Y-axis direction coincides with the outer surfaces of the cylindrical portions 122, 132, and 142.

[0045] The fifth member 150 has a flat bottom portion 151 and cylindrical portions 152 and 153 positioned on the Y-axis minus side from the periphery of the bottom portion 151. A through hole 103 is formed in the bottom portion 151 that penetrates through it. The cylindrical portion 152 is a thicker portion than the cylindrical portion 153 and is the part to which the Y-axis plus side end of the fourth member 140 is connected. Therefore, the bottom portion 151 and the cylindrical portion 152 of the fifth member 150 are formed together with the bottom portion 141 of the fourth member 140 to surround the fourth air chamber C4. In other words, the fourth member 140 and the fifth member 150 form the fourth air chamber C4.

[0046] Furthermore, the cylindrical portion 153 is a thin-walled portion with a thinner thickness than the cylindrical portion 152. The outer circumferential surface of the cylindrical portion 153 coincides with the surface obtained by extending the outer circumferential surface of the cylindrical portion 152 in the negative Y-axis direction. In other words, a space S1 is formed between the inner circumferential surface of the cylindrical portion 153 and the outer circumferential surfaces of the first portion 111 of the first member 110, and the cylindrical portions 122, 132, and 142. As shown in Figure 6, the space S1 is formed to surround the second air chamber C2. Figure 6 shows an example in which the space S1 is formed to surround the second air chamber C2, but the same can be said for the first air chamber C1 and the third air chamber C3. Note that Figure 6 is a VI-VI cross-sectional view obtained by cutting the position of the third member 130 in Figure 5 in the XZ plane.

[0047] Thus, the cover 102 further has a cylindrical portion 122 as a first wall portion that surrounds the portion of the first air chamber C1 excluding the opening 104 and the bottom portion 121, and a cylindrical portion 153 as a second wall portion that is spaced apart from the cylindrical portion 122 and further surrounds the cylindrical portion 122. Similarly, the cover 102 may have cylindrical portions 132 and 142 as first wall portions, and the cylindrical portion 153 as a second wall portion may be spaced apart from the cylindrical portions 132 and 42. The space S1, which is an annular space formed between the cylindrical portions 122, 132 and 142 as first wall portions and the cylindrical portion 153, may be sealed.

[0048] This allows the first air chamber C1, where the sound pressure of the sound emitted from the person's mouth is greater than that of the other air chambers, to be surrounded by at least the space S1, thereby reducing sound leakage to the outside through the cylindrical portion 122 of the first air chamber C1.

[0049] The first member 110, the second member 120, the third member 130, the fourth member 140, and the fifth member 150 may be made of resin or metal.

[0050] Furthermore, the volumes of the first air chamber C1, the second air chamber C2, the third air chamber C3, and the fourth air chamber C4 are all larger than the volume of any of the passage sections 123, 133, and 143. Also, if we consider the first air chamber C1, the second air chamber C2, the third air chamber C3, and the fourth air chamber C4 as tubes through which sound propagates, the diameter of the sound propagation path can be said to be larger than the diameter of the sound propagation path of the passage sections 123, 133, and 143. The diameter of the sound propagation path is the width (minimum width, maximum width, average width, etc.) of the air chamber or passage section when it is cut by a plane perpendicular to the sound propagation path. Therefore, when sound emitted from a person's mouth in the first air chamber C1, which accommodates the person's mouth, propagates from the first air chamber C1 to the second air chamber C2, it passes through passage sections 123, which have a smaller volume than the first and second air chambers C1 and C2, thus effectively reducing the sound pressure of the sound emitted from the person's mouth. Furthermore, when sound propagates from the second air chamber C2 to the third air chamber C3, and from the third air chamber C3 to the fourth air chamber, it passes through passage sections 133 and 143, which have a smaller volume than the respective volumes of the second air chamber C2, third air chamber C3, and fourth air chamber C4, thus more effectively reducing the sound pressure of the sound propagating to the third air chamber C3 and the sound propagating to the fourth air chamber C4.

[0051] The through-hole 103 is formed in the bottom 151 of the fifth member 150. In other words, the through-hole 103 connects the fourth air chamber C4, which is located furthest from the first air chamber C1 among the multiple air chambers C1 to C4, to the space outside the cover 102. Here, "furthest from the first air chamber C1" means the furthest distance along the path formed by the multiple air chambers C1 to C4 and the multiple passages 123, 133, and 143 inside the cover 102.

[0052] Furthermore, sound-absorbing material may be provided on the inner walls of the first, second, third, and fourth air chambers C1, C2, C3, and C4. This will allow for a more effective reduction in the sound pressure of human speech.

[0053] In this embodiment, the microphone 160 is positioned on the inner circumferential surface of the cylindrical portion 122 of the second member 120. The microphone 160 collects sound. The microphone 160 is connected to a signal processing circuit and a communication interface (IF) (not shown), and the processing results obtained by the signal processing circuit may be transmitted to an external device via the communication interface. The signal processing circuit may be implemented in hardware and may be a dedicated circuit that performs hardware processing, or it may be implemented in software and may be a processor that performs software processing and a memory that stores the software processing program. The microphone 160, the signal processing circuit and the communication interface may be powered by the battery provided in the mask 100, or by an external power supply (commercial power supply or external battery).

[0054] Next, we will describe the passage sections 123, 133, and 143.

[0055] Figure 7 is a cross-sectional view taken along line VII-VII, showing the passage section 133 in Figure 5.

[0056] The passage section 133 is the part that connects the second air chamber C2 and the third air chamber C3. As shown in Figure 6, the passage section 133 has a folded structure. The folded structure of the passage section 133 has an opening 133a, a first portion 133b, a second portion 133c, and an opening 133d.

[0057] The opening 133a is the entrance to the passage 133 and the boundary with the second air chamber C2. The first portion 133b extends in the Z-axis direction. The second portion 133c extends in the Z-axis direction. The first portion 133b and the second portion 133c overlap each other in the Z-axis direction and are positioned at different locations in the Y-axis direction, which intersects the Z-axis direction. The first portion 133b communicates with the second air chamber C2 at one end and with the second portion 133c at the other end. The second portion 133c communicates with the first portion 133b at one end and with the third air chamber C3 at the other end.

[0058] Note that passages 123 and 143 have the same configuration as passage 133, so their explanation will be omitted. Passage 123 is the part that connects the first air chamber C1 and the second air chamber C2. Passage 143 is the part that connects the third air chamber C3 and the fourth air chamber C4.

[0059] Figure 8 is a perspective view including a cross-section when the mask 100 is cut along the XY plane. Figure 9 is a perspective view including a cross-section when the mask 100 is cut along the YZ plane passing through the passages 123 and 143.

[0060] As explained in Figures 2 to 7, the cover 102 has a configuration comprising a first member 110 and bottomed cylindrical second member 120, third member 130, fourth member 140, and fifth member 150, and a space including a first air chamber C1, a second air chamber C2, a third air chamber C3, and a fourth air chamber C4 is formed inside. The cover 102 has an opening 104, one or more bottom parts 121, 131, 141 as partitions, and one or more passage parts 123, 133, 143. The bottom parts 121, 131, 141 are examples of one or more partitions that divide the space inside the cover 102 into multiple air chambers including the first air chamber C1, the second air chamber C2, the third air chamber C3, and the fourth air chamber C4. The one or more passage parts 123, 133, 143 connect the multiple air chambers to each other. The passage 123 connects the first air chamber C1 and the second air chamber C2. The passage 133 connects the second air chamber C2 and the third air chamber C3. The passage 143 connects the third air chamber C3 and the fourth air chamber C4. The first air chamber C1 is formed between the bottom 121, which is the first partition that partitions the first air chamber C1, and the opening 104, of the bottom 121, 131, and 141 which are one or more partitions.

[0061] Furthermore, the first, second, third, and fourth air chambers C1, C2, C3, and C4 are aligned in the front-to-back direction (Y-axis direction) of a person when the mask 100 is worn over their mouth. The passage 123 connecting the first and second air chambers C1 and C2, and the passage 133 connecting the second and third air chambers C2 and C3, are positioned so as not to overlap when viewed from the front-to-back direction. Similarly, the passage 133 and the passage 143 connecting the third and fourth air chambers C3 and C4 are positioned so as not to overlap when viewed from the front-to-back direction.

[0062] In this way, the inlet and outlet of the second air chamber C2 are positioned so that their positions in the front-to-back direction do not overlap, thus increasing the distance sound travels through the second air chamber C2. Furthermore, since the first air chamber C1, the second air chamber C2, the third air chamber C3, and the fourth air chamber C4 can be arranged side by side in the front-to-back direction, the size of the cover 102 can be made more compact. Therefore, the sound pressure inside the cover 102 can be effectively reduced.

[0063] [Effects, etc.] The mask 100 according to this embodiment includes a cover 102 that covers a person's mouth. The cover 102 has a space formed inside. The cover 102 has an opening 104 that is fitted over a person's mouth, one or more bottom portions 121, 131, 141 that divide the space inside the cover 102 into a plurality of air chambers, and one or more passage portions 123, 133, 143 that connect the plurality of air chambers to each other. The plurality of air chambers include a first air chamber C1 and a second air chamber C2. The first air chamber C1 is formed between the bottom portion 121, which is a first partition portion that separates the first air chamber C1 from the bottom portions 121, 131, 141, and the opening 104.

[0064] According to this, since the first air chamber C1, the second air chamber C2, the third air chamber C3, and the fourth air chamber C4 are connected by passages 123, 133, and 143, sound emitted from a person's mouth in the first air chamber C1 passes through the first air chamber C1, passage 123, the second air chamber C2, passage 133, the third air chamber C3, passage 143, and the fourth air chamber C4 in that order. Therefore, sound propagates along a path that repeatedly alternates between the wide spaces of the air chambers and the narrow spaces of the passages. In this way, because sound propagates along a path that repeatedly alternates between wide and narrow spaces, the attenuation effect of sound can be improved.

[0065] Furthermore, in the mask 100 according to this embodiment, each of the passage sections 123, 133, and 143 has a folded structure. This allows the distance over which sound propagates in the passage sections 123, 133, and 143 to be increased. Thus, the sound pressure of voices emitted from a person can be effectively reduced.

[0066] [Example 1] In the above embodiment, the folding structure of each passage section is a structure that bends at a 180-degree angle, but it is not limited to this, and may be a structure that bends at an angle of less than 180 degrees. That is, the folding structure has a first part that extends in a first direction and a second part that communicates with the first part and extends in a second direction different from the first direction. The second direction may be perpendicular to the first direction, may intersect at an acute angle, or may intersect at an obtuse angle. The first part of the passage section communicates with the first air chamber at one end and with the second part of the passage section at the other end, and the second part of the passage section communicates with the first part at one end and with the second air chamber at the other end.

[0067] [Differentiation 2] In the above embodiment, the mask 100 has a configuration having four air chambers, but it is not limited to this configuration. It may have any configuration having two air chambers and a passage connecting the two air chambers. The number of air chambers may be two or more, and the number of passages may be two or more, provided that the passage connects two or more air chambers.

[0068] Although a mask relating to one or more embodiments of this disclosure has been described above based on embodiments, this disclosure is not limited to these embodiments. Without departing from the spirit of this disclosure, various modifications to these embodiments that a person skilled in the art could conceive of, or forms constructed by combining components from different embodiments, may also be included within the scope of one or more embodiments of this disclosure. [Industrial applicability]

[0069] This disclosure is useful as a mask or the like that can sufficiently achieve an audio attenuation effect. [Explanation of Symbols]

[0070] 100 masks 101 Cushion body 102 Cover 103 Through hole 104 Opening 110 First Member 111 Part 1 112 Part 2 120 Second Member 121, 131, 141, 151 bottom 122, 132, 142, 152, 153 Cylindrical part 123, 133, 143 Passage section 130 Third Member 133a, 133d opening 133b Part 1 133c Part 2 140 Fourth member 150 Fifth member 160 Microphones C1 First air chamber C2 Second air chamber C3 Third air chamber C4 Fourth chamber S1 space

Claims

1. A mask equipped with a cover that covers a person's mouth, The aforementioned cover has a space formed inside, The cover has an opening that is fitted over the mouth of the person, one or more partitions that divide the space into a plurality of air chambers including a first air chamber and a second air chamber, and one or more passages that connect the plurality of air chambers to each other. The first air chamber is formed between one of the one or more partitions, which is a plate-shaped first partition that partitions the first air chamber, and the opening. The mask further comprises a band for attaching the mask to the head of the person, The first air chamber and the second air chamber are adjacent to each other with the first partition as the boundary. Of the one or more passages mentioned above, the first passage connecting the first air chamber and the second air chamber has a path longer than the thickness of the one first partition. mask.

2. moreover, A microphone placed inside the first chamber, A signal processing circuit that processes the signal from the microphone, The system includes a communication interface for transmitting the processing results from the signal processing circuit to an external device. The mask according to claim 1.

3. moreover, The system includes the microphone, the signal processing circuit, and a battery that supplies power to drive the communication interface. The mask according to claim 2.

4. In any direction within the plane perpendicular to the passage direction of the first passage connecting the first and second air chambers, the width of the cross-section of the first passage along that direction is shorter than the width of the space along that direction within the same plane. The mask according to any one of claims 1 to 3.

5. At least one of the one or more passage sections has a folded structure The mask according to any one of claims 1 to 4.

6. The folded structure has a first portion extending in a first direction and a second portion communicating with the first portion and extending in the first direction. The first part and the second part overlap each other in the first direction and are positioned at different locations in the second direction intersecting the first direction. The first part communicates with the first air chamber at one end and with the second part at the other end. The second portion communicates with the first portion at one end and with the second air chamber at the other end. The mask according to claim 5.

7. The folded structure has a first portion extending in a first direction and a second portion communicating with the first portion and extending in a second direction different from the first direction. The first part communicates with the first air chamber at one end and with the second part at the other end. The second portion communicates with the first portion at one end and with the second air chamber at the other end. The mask according to claim 5.

8. The volume of each of the aforementioned multiple air chambers is greater than the volume of each of the one or more passage sections. The mask according to any one of claims 1 to 7.

9. The plurality of air chambers further include a third air chamber, which is arranged in the front-to-back direction of the person when the mask is fitted over the mouth. The first passage, which connects the first and second air chambers, and the second passage, which connects the second and third air chambers, are positioned so as not to overlap when viewed from the front-to-back direction. The mask according to any one of claims 1 to 8.

10. The aforementioned cover further, The air chamber located furthest from the first air chamber among the plurality of air chambers has a through hole that connects it to the space outside the cover. The mask according to any one of claims 1 to 9.

11. The cover has sound-absorbing material placed in the plurality of air chambers. The mask according to any one of claims 1 to 10.

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