Fabric

Abstract

Provided is a fabric which, when used as a fabric for adjusting the back pressure of a speaker, an earphone, or the like, effectively prevents leakage of sound to the outside and intrusion of external noise, and which has little variation in acoustic characteristics. A woven fabric comprising warp yarns and weft yarns, the woven fabric being characterized in that the air permeability resistance is 0.3 kPa.s / m or more and 5 kPa.s / m or less, and the tolerance of the air permeability resistance of the woven fabric is within + / -10%. Furthermore, the fabric is characterized in that at least one of the warp yarn and the weft yarn is a multifilament yarn. Furthermore, the woven fabric is characterized in that the multifilament yarn is an untwisted yarn which is not twisted.

Description

Technical Field

[0001] The invention relates to fabrics used for audio equipment such as loudspeakers and headphones. Background Art

[0002] Usually, in so-called sealed-type audio equipment such as speakers, earphones, and headphones, the air chamber behind the vibration plate is sealed, and the movement of the sound-producing part (vibration plate) is restricted due to changes in air pressure, so that the intended sound cannot be produced. Therefore, in order to adjust the pressure (back pressure) inside the device, a back pressure adjustment function called a vent is provided. The vent has tiny air holes for adjusting the back pressure, and is required to have the function of preventing sound from leaking to the outside or preventing noise from invading from the outside. In the past, for the air holes connecting the inside and outside of such audio equipment, there were installed audio components that were breathable, such as plates made of plastic or metal, film-like fiber structures, etc., which had air permeability due to air permeable portions such as a plurality of small holes.

[0003] Patent Document 1 discloses a laminated fiber structure formed by combining a monofilament fiber material and a polymer film for use in an audio component, and describes an application example of attaching the laminated fiber structure to the back side of a headphone.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Publication No. 2013-526172 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, when the fiber structure and the film are stacked as in Patent Document 1, a bonding portion between the fiber structure and the film is required, and the air permeable portion is blocked at the bonding portion. When the fiber structure is used in an audio device such as a small earphone, a portion is cut from the stacked fiber structure for use, but the number of bonding portions varies depending on the cut portion, resulting in deviations in air permeability. When there is a deviation in air permeability, there is a problem of deviation in acoustic characteristics between the left and right sides of the earphone, for example.

[0009] The present invention is completed to solve such conventional problems, and its purpose is to provide a fabric with small deviation in acoustic characteristics that effectively prevents sound leakage to the outside and external noise intrusion when used as a fabric for adjusting the back pressure of speakers, headphones, etc.

[0010] Solutions for solving problems

[0011] The gist of the present invention is as follows.

[0012] (1) A fabric, characterized in that it is composed of warp yarns and weft yarns, has an air permeability resistance of 0.3 kPa·s / m or more and 5 kPa·s / m or less, and the tolerance of the air permeability resistance of the fabric is within ±10%.

[0013] (2) The woven fabric according to (1) above, wherein at least one of the warp yarn and the weft yarn is a multifilament yarn.

[0014] (3) The woven fabric according to (1) above, wherein the warp yarns and the weft yarns are multifilament yarns.

[0015] (4) The woven fabric according to (2) or (3) above, wherein the multifilament yarn is an untwisted yarn having no twist.

[0016] (5) The woven fabric according to (2) or (3) above is characterized in that the cross-sectional shape of the monofilaments constituting the multifilament yarn is any one of a circle, an ellipse, a polygon with each internal angle less than 180 degrees, and a substantially polygon with rounded corners.

[0017] (6) The woven fabric according to (2) or (3), wherein the variation in apparent yarn diameter of the multifilament yarn is within 5% when observed in the air permeation direction of the woven fabric.

[0018] (7) The woven fabric according to any one of (1) to (3) above, wherein the woven fabric is a dutch weave, a twill weave, or a twill dutch weave.

[0019] (8) The woven fabric according to any one of (1) to (3) above, wherein the woven fabric is used as a fabric for adjusting back pressure of an audio device.

[0020] (9) The woven fabric according to (1) above, wherein the warp yarns and the weft yarns have a yarn diameter of 30 μm or more and 100 μm or less.

[0021] (10) The woven fabric according to (1) above, wherein the yarn pitch (OP) of the woven fabric is 20 μm or less.

[0022] (11) The woven fabric according to (1) above, wherein the open area ratio (OPA) of the woven fabric is 15% or less.

[0023] Effects of the Invention

[0024] According to the present invention, when used as a fabric for adjusting back pressure of a speaker, earphone, etc., it is possible to provide a fabric that effectively prevents sound leakage to the outside and external noise from entering and has little variation in acoustic characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram showing the structure of the woven fabric 1 according to the present embodiment.

[0026] Figure 2 This is a diagram showing a portion of the multifilament yarn when viewed from the air permeation direction of the woven fabric 1. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the present invention. The purpose of the fabric of the present embodiment is not limited, and it can be used as an audio fabric for maintaining air permeability and blocking the air holes of audio equipment such as speakers and headphones. Moreover, the fabric of the present embodiment is particularly suitable as an audio fabric for back pressure adjustment in sealed audio equipment such as speakers and headphones, which is configured in a manner to block the air holes connecting the inside and outside of the audio equipment for back pressure adjustment. In addition, the fabric of the present embodiment can also be used, for example, as a waterproof cloth to prevent liquid from invading the interior of an audio equipment, a dustproof cloth to prevent dust from invading, a component of an audio equipment such as a speaker, etc. Cut into a shape corresponding to the installation position of the audio equipment and used for these various purposes.

[0028] Figure 1 1 is a structural diagram showing the structure of the fabric 1 of this embodiment. The fabric 1 is formed by weaving warp yarns 2 and weft yarns 3. Figure 1 The fabric 1 is a plain weave fabric as an example. The fabric 1 has a plurality of gaps 4 formed by the intersection of warp yarns 2 and weft yarns 3. When the fabric 1 is disposed in the ventilation holes of audio equipment such as speakers and headphones, the gaps 4 are used to allow air to ventilate, and back pressure adjustment is performed in the case of back pressure adjustment. Depending on the number and size of the gaps 4, the fabric 1 has a specified air resistance. Depending on various conditions such as the material of the warp yarns 2 and weft yarns 3, the difference between monofilaments / multifilaments, and the yarn diameter, the size and shape of the gaps change, and the air resistance also changes accordingly. It should be noted that Figure 1 For ease of understanding, the gaps 4 are shown larger than the diameters of the warp yarns 2 and the weft yarns 3 , but in the actual woven fabric 1 , the yarns are clogged and the gaps 4 are smaller.

[0029] (Tolerance of air permeability resistance)

[0030] The tolerance of the air permeability resistance of the fabric 1 of the present embodiment is within ±10%. The fabric 1 with a tolerance of air permeability resistance within ±10% refers to a fabric whose allowable error relative to the design value (prescribed reference value) of the air permeability resistance is within ±10% of the design value (prescribed reference value). If the tolerance of air permeability resistance is within ±10%, when the fabric 1 of the present embodiment is used for back pressure adjustment of audio equipment such as speakers and headphones, the deviation of acoustic characteristics is small, so it is preferred. If the tolerance of air permeability resistance exceeds ±10%, the deviation of acoustic characteristics in the audio equipment becomes large.

[0031] Regarding whether the fabric 1 satisfies the condition within the tolerance of ±10%, it is sufficient to measure the air resistance value at a plurality of different non-repeating locations of the fabric 1 by a prescribed method, and confirm whether the measured value is within ±10% of the design value (prescribed reference value). In this embodiment, the air resistance is measured at at least 5 non-repeating locations in the fabric 1, and it is sufficient to confirm that it is within the tolerance range.

[0032] The air permeability resistance of the fabric 1 can be measured using a KES (Kawabata Evaluation System) air permeability tester. The air permeability resistance value ([kPa·s / m]) obtained using the KES air permeability tester is based on the pressure loss of the test piece measured by a pressure sensor (in standard measurement, a fixed flow rate, such as 4 cm 3 / cm 2 The value calculated from the value obtained by using the pressure difference before and after the test piece due to the resistance of the test piece in the case of ·s) [kPa].

[0033] (Breathable resistance value)

[0034] The air permeability resistance value of the fabric 1 of this embodiment can be appropriately determined according to the performance required of the fabric, but it is preferably 0.3 kPa·s / m or more in the measurement of the above-mentioned KES air permeability tester. This is because, by having an air permeability resistance of 0.3 kPa·s / m or more, it is possible to maintain the acoustic characteristics required when used as a back pressure adjustment member of an audio device and obtain a back pressure adjustment function. It should be noted that the upper limit of the air permeability resistance value is not particularly limited, but in order to ensure the back pressure adjustment function (air permeability) in the audio device, it can be set to 5 kPa·s / m or less.

[0035] (yarn diameter)

[0036] The fabric 1 of the present embodiment preferably has a yarn diameter of 30 μm or more. This is because, by having a yarn diameter of 30 μm or more, a fabric with high air permeability resistance required for back pressure adjustment can be obtained. There is no particular upper limit to the yarn diameter, but if the yarn diameter becomes larger, the bending angle of the yarn at the intersection of the warp and weft yarns cannot be reduced, and the distance between adjacent yarns cannot be close to each other, resulting in gaps and no mesh with high air permeability resistance can be obtained, so it is sufficient to be less than 100 μm. It should be noted that the yarn diameter can be obtained by photographing the fabric 1 from a direction orthogonal to the fabric surface using a microscope and performing known image processing on the image. The yarn diameter is the average value of the yarn diameters of the warp and weft yarns obtained by measuring the diameters of the warp and weft yarns at at least 5 different locations of the fabric 1.

[0037] (OP)

[0038] The fabric 1 of this embodiment preferably has a yarn pitch (OP) of 20 μm or less. More preferably, it is 18 μm or less. This is to obtain a fabric with high air permeability resistance required for a fabric used for back pressure adjustment. For the lower limit of the yarn pitch, even in the case where there is no opening in the plane when viewed from a vertical direction relative to the fabric 1, as in a dense weave fabric, as long as there is a gap (space) at the intersection of the warp yarn and the weft yarn, it only needs to be 0 μm or more. The yarn pitch refers to the distance between two adjacent warp yarns in the weft direction and the distance between two adjacent weft yarns in the warp direction when viewed from the air permeability direction in the mesh fabric, and is the length of one side of the opening formed in the mesh fabric. The yarn pitch can be calculated by the following formula (1).

[0039] [Mathematical formula 1]

[0040]

[0041] In the above formula (1), OP is the yarn pitch [μm], M is the number of meshes [threads / inch], and D is the diameter of the warp and weft yarns [μm]. The number of meshes M is the number of yarns contained in the width of 1 inch (2.54 cm) of the mesh fabric. As shown in the above formula (1), the yarn pitch OP can be calculated based on the number of meshes M and the diameter of the yarn D. It should be noted that when the OP in the warp and weft directions are different, the OP in the warp direction of the above formula (1) is calculated by taking the number of meshes M as the number of meshes in the warp direction and the yarn diameter D as the diameter of the weft yarn. The OP in the weft direction is calculated by taking the number of meshes M as the number of meshes in the weft direction and the yarn diameter D as the diameter of the warp yarn.

[0042] It should be noted that the diameter D of the yarn can be obtained by photographing the fabric 1 from a direction perpendicular to the fabric surface using a microscope and performing known image processing on the image. The diameter D of the yarn is the average value obtained by measuring the diameter of the yarn at at least 5 different locations of the fabric 1. When the OP is different in the warp direction and the weft direction and the OP is calculated separately, the warp yarn and the weft yarn are measured at 5 locations respectively and the average value is obtained respectively. As the location for measuring the diameter D, the measurement is performed in the middle between the adjacent intersections where the warp yarn and the weft yarn intersect.

[0043] (OPA)

[0044] The fabric 1 of this embodiment preferably has an open area ratio (OPA) of 15% or less. This is because, by setting it to 15% or less, a fabric with high air permeability resistance required for a fabric for back pressure adjustment is obtained. As described above, even if there is no planar opening, as long as there is a gap, the lower limit of the open area ratio can be 0% or more. The open area ratio is an index representing the area ratio of the opening portion of the mesh fabric, and is calculated by the following formula (2).

[0045] [Mathematical formula 2]

[0046]

[0047] In the above formula (2), OPA is the open area ratio [%], OP is the yarn pitch [μm], and D is the diameter of the warp and weft yarns [μm]. It should be noted that when the OP in the warp direction and the weft direction are different, when the OP in the warp direction is set to OP1, the OP in the weft direction is set to OP2, the diameter of the warp yarn is set to D1, and the diameter of the weft yarn is set to D2, OPA is expressed by the following formula (3). The diameters D, D1, and D2 of the yarns are all average values ​​of the above diameters.

[0048] [Mathematical formula 3]

[0049]

[0050] (Material of yarn)

[0051] The material of the yarn (warp yarn 2, weft yarn 3) constituting the fabric 1 can be appropriately determined, but in the case of setting a high air permeability resistance for back pressure adjustment, it is preferred to use synthetic fibers. Since synthetic fibers have softness, the gaps 4 formed by the warp yarn 2 and the weft yarn 3 of the fabric 1 can be reduced, and the air permeability resistance of the fabric 1 can be increased.

[0052] As synthetic fibers, for example, polyethylene terephthalate (PET), polypropylene, 6-nylon, 66-nylon, polyethylene, ethylene-vinyl acetate copolymer, polycarbonate, polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), polyetheretherketone (PEEK), modified polyphenylene ether (PPE), polyaryletherketone (PAEK), polystyrene (PS) including crystalline polystyrenes such as syndiotactic polystyrene (SPS) and isotactic polystyrene, and polyimide (PI) can be used.

[0053] In addition, as the material of the yarn, fluorine-based fibers, thermoplastic resins such as aromatic polyamide, polyarylate, ultra-high molecular weight polyethylene, polyparaphenylenebenzobisoxazole (PBO), polyparaphenylenebenzodithiazole (PBT), polyparaphenylenebenzodiimidazole (PBI), polyacetal resin, polyarylate resin, polysulfone resin, polyvinylidene fluoride resin, ethylene tetrafluoroethylene (ETFE), polytetrafluoroethylene (PTFE), polylactic acid resin, polyhydroxybutyrate resin, modified starch resin, polycaprolactone resin, polybutylene succinate resin, poly Biodegradable resins such as butylene adipate terephthalate resin, polybutylene succinate terephthalate resin, and polyethylene succinate resin, phenolic resins, urea-formaldehyde resins, melamine resins, unsaturated polyester resins, diallyl phthalate resins, epoxy resins, epoxy acrylate resins, silicone resins, acrylic urethane resins, polyurethane resins and other thermosetting resins, silicone resins, fibers formed from elastomers such as polystyrene elastomers, polyethylene elastomers, polypropylene elastomers, and polyurethane elastomers, carbon fibers, and fibers formed from liquid crystal polymers.

[0054] Only one kind of the above-mentioned fibers may be used as the yarn constituting the woven fabric 1, or two or more kinds may be used. The yarn may have a core-sheath structure, and the materials of the core and sheath may be the materials described above.

[0055] Among the synthetic fibers mentioned above, polyester such as PET and nylon are preferred because these synthetic fibers have appropriate softness and elongation, are excellent in weaving properties, and can be easily woven into a mesh with high air permeability resistance.

[0056] (Fiber shape)

[0057] The yarns (warp yarns 2 and weft yarns 3) constituting the fabric 1 may be monofilaments or multifilaments. For example, both the warp yarns 2 and the weft yarns 3 may be constituted by monofilaments or multifilaments, or one of the warp yarns 2 and the weft yarns 3 may be constituted by monofilaments and the other by multifilaments.

[0058] In order to improve the air permeability resistance of the fabric 1, it is preferred that at least one of the warp yarn 2 and the weft yarn 3 is a multifilament, and it is more preferred that both are multifilaments. This is because when a multifilament is used, the air permeability resistance becomes higher, which is preferred for use as a back pressure adjustment of a vibration plate. This is because multifilaments are more flexible than monofilaments, and the gaps 4 can be further narrowed, which can further improve the air permeability resistance of the fabric 1.

[0059] In this embodiment, when the warp yarn 2 and the weft yarn 3 of the fabric 1 are multifilament yarns, untwisted yarns or twisted yarns can be used, but untwisted yarns are preferably used. This is because, in the case of untwisted yarns, the deviation of the yarn width when viewed from the air permeability direction of the fabric 1, that is, the apparent yarn diameter, is very small, and the deviation of the air permeability resistance in the fabric 1 is also smaller. The air permeability direction is a direction perpendicular to the surface of the fabric 1, which is from the Figure 1 The method for measuring the apparent yarn diameter is described below.

[0060] Here, through Figure 2 The apparent yarn diameter will be described. Figure 2 The diagram shows a portion of the multifilament yarn constituting the fabric 1 when viewed from the air permeability direction of the fabric 1, which is a direction perpendicular to the length direction of the yarn. (a) is an untwisted multifilament yarn consisting of two monofilaments (filaments), and (b) is a twisted multifilament yarn formed by twisting two monofilaments. Figure 2 In the case of (a) without twisting, there is no apparent change in yarn diameter due to twisting, so the deviation of yarn diameter Wa is very small. Figure 2 In the case of the twisted yarn (b), there is a portion whose apparent yarn diameter is Wb1 (a portion where two yarns are located above and below when observed from the air permeability direction) and a portion Wb2 whose apparent yarn diameter is smaller than Wb1 (a portion where the two yarns overlap near the front and inside when observed from the same direction). In the yarn as a whole, the deviation of the apparent yarn diameter becomes larger than in the case of no twist.

[0061] In this way, the apparent yarn diameter of the multifilament untwisted yarn has a small deviation, so it is possible to form a fabric with a smaller deviation in the size and shape of the gaps 4 when the fabric 1 is viewed from a direction parallel to the air permeation direction. In addition, by making the deviation in the size of the gaps 4 smaller, it is possible to form a fabric with a smaller deviation in air permeability resistance.

[0062] In the present embodiment, when the yarn (warp yarn 2, weft yarn 3) is a multifilament, the cross-sectional shape of each monofilament (filament) constituting the multifilament may be a circular shape, an elliptical shape, a polygonal shape, etc., but preferably has no concave portion in the cross-sectional shape. Specifically, any of a circular shape, an elliptical shape, and a polygonal shape with each internal angle less than 180 degrees is preferred.

[0063] This is because, in the case of forming multifilament yarns using filaments with cross-sectional shapes without recesses, the deviation of the apparent yarn diameter is smaller. On the other hand, as an example of a filament with a recessed cross-sectional shape, in the case of a filament with a Y-shaped cross section, sometimes the filaments mesh with each other and other filaments are embedded in and enter the recess. If there are parts embedded in the recess and parts not embedded in the recess, the apparent yarn diameter (thickness) of the multifilament yarn will deviate, resulting in a deviation in air permeability resistance. Even in the case of a shape other than the Y-shaped cross-sectional shape with a polygonal cross-sectional shape having an inner angle exceeding 180 degrees, other filaments enter the recess formed by the corner exceeding 180 degrees, which will also produce a deviation in the apparent yarn diameter of the multifilament yarn, resulting in a deviation in air permeability resistance.

[0064] It should be noted that, regarding the case where the above-mentioned cross-sectional shape is circular or elliptical, it also includes a roughly circular or elliptical shape. The polygons whose interior angles are less than 180 degrees can be n-gons (n ​​is an integer greater than 3) such as triangles and quadrilaterals, and whose interior angles are all less than 180 degrees. In addition, regarding the cross-sectional shape of the polygon whose interior angles are less than 180 degrees, it can also be a roughly polygonal shape such as a rounded shape (rounded corner) in which each corner is rounded.

[0065] (Deviation in apparent yarn diameter)

[0066] In the present embodiment, when the yarns (warp yarns 2 and weft yarns 3) of the fabric 1 are multifilaments, the deviation of the apparent yarn diameter is preferably within 5%, and more preferably within 3%. If the deviation of the apparent yarn diameter is large, the size and shape of the gaps 4 formed by the warp yarns 2 and the weft yarns 3 will vary depending on the cut-off part of the fabric 1, and the tolerance of the air permeability resistance will increase, resulting in a large deviation in the acoustic characteristics.

[0067] It should be noted that the apparent yarn diameter is the width (thickness) of the yarn when observed from the air permeability direction of the fabric 1 (when observed from a direction perpendicular to the length direction of the yarn) as described above. The apparent yarn diameter can be obtained by photographing the fabric 1 from a direction perpendicular to the fabric surface using a microscope and performing known image processing on the image.

[0068] The deviation of the apparent yarn diameter in the fabric 1 is preferably obtained by measuring the apparent yarn diameter of each of the warp and weft yarns at at least 5 different locations of the fabric 1. As the measurement location, the measurement is performed in the middle between adjacent intersections where the warp and weft yarns intersect. It should be noted that in this embodiment, the deviation of the apparent yarn diameter is as shown in the following formula (4), which is the value obtained by dividing the average value of the measured value of the apparent yarn diameter and the absolute value of the difference between each measured value by the average value. The deviations at the 5 measurement locations are preferably within 5%.

[0069] Deviation of apparent yarn diameter = {absolute value of (measured value - average value)} / average value × 100 (4)

[0070] It should be noted that, as described above, the multifilament yarn is preferably an untwisted yarn, but a twisted yarn may be used as long as the apparent yarn diameter deviation is within 5%. If the apparent yarn diameter deviation is within 5%, the deviation of the air permeability resistance can be sufficiently reduced. It is more preferably within 3%. This is because if the deviation is within 3%, the deviation of the air permeability resistance can be further reduced.

[0071] (Fabric Structure)

[0072] As mentioned above, Figure 1 The fabric 1 of the embodiment shows a plain weave as an example, but the fabric weave is not particularly limited thereto. The fabric of the present embodiment may be, for example, a plain weave, a satin weave, a twill weave, a basket weave, a dutch weaving weave, etc., preferably a dutch weave (plain dutch weaving weave), a twill weave or a twill dutch weaving weave, and more preferably a twill dutch weaving weave. When the dutch weave is projected from the front, since the warp yarns are closely fitted, there is no opening when observed from a direction perpendicular to the surface of the fabric 1, so that the air permeability resistance can be improved. When the dutch weave is observed from the cross-sectional direction of the fabric, there is a gap in the three-dimensionally staggered part at the intersection of the warp yarn and the weft yarn, and air can be permeated through the gap. In addition, a twill weave, such as a 2 / 2 twill weave, refers to a fabric weave in which the warp yarns are repeatedly passed over 2 weft yarns and then passed under 2 weft yarns, and the weft yarns are repeatedly passed over 2 warp yarns and then passed under 2 warp yarns (in the case of a 1 / 1 twill weave, it is called a plain weave). As described above, when the fabric is viewed from the cross-sectional direction, at the intersection of the warp and the weft, there are gaps in the three-dimensionally interlaced parts, but in the case of the twill weave, the number of gaps in the three-dimensionally interlaced parts is reduced, which can improve the air permeability resistance. By forming a twill dense weave that introduces the advantages of both the twill weave and the dense weave, the air permeability resistance can be further improved, which is more preferred.

[0073] The fabric 1 of the present embodiment described above can be used in devices with various audio functions such as speakers, microphones, etc., which have breathable parts and sound-permeable parts, headphones, headphones, speakers, portable terminals, PCs, receivers, hearing aids, wearable terminals, etc.

[0074] According to the fabric 1 of the present embodiment described above, it is possible to provide a fabric having a high air permeability resistance capable of adjusting the pressure (back pressure) inside the device, a fabric having a smaller deviation in acoustic characteristics that can reduce noise from the outside and prevent sound from leaking to the outside. In addition, through this embodiment, in addition to fabrics for adjusting the back pressure of speakers, etc., it is also possible to provide fabrics suitable for audio protective covers, audio waterproof covers, etc. that prevent liquid intrusion and have small deviations in acoustic characteristics and have stable acoustic characteristics. In addition, the fabric 1 of the present embodiment is a fabric with a tolerance of air permeability resistance within ±10%, so when it is cut from a long strip of fabric for use, the deviation in acoustic characteristics caused by the cut portion is small, and it is possible to provide an audio device with stable quality.

[0075] Description of Reference Numerals

[0076] 1 Fabric

[0077] 2 Warp

[0078] 3 Weft

[0079] 4. Gap

Claims

1. A fabric, characterized in that: It is composed of warp and weft yarns. The air permeability resistance is 0.3 kPa·s / m or more and 5 kPa·s / m or less. The tolerance of the air permeability resistance of the fabric is within ±10%.

2. The fabric according to claim 1, characterized in that At least one of the warp yarns and the weft yarns is a multifilament yarn.

3. The fabric according to claim 1, characterized in that The warp yarns and the weft yarns are multifilament yarns.

4. The fabric according to claim 2 or 3, characterized in that The multifilament yarn is an untwisted yarn without twisting.

5. The fabric according to claim 2 or 3, characterized in that: The cross-sectional shape of the monofilament constituting the multifilament yarn is any of a circle, an ellipse, a polygon with each internal angle smaller than 180 degrees, and a substantially polygon with rounded corners.

6. The fabric according to claim 2 or 3, characterized in that: When the woven fabric is viewed in an air permeation direction, the deviation of the apparent yarn diameter of the multifilament yarn is within 5%.

7. The fabric according to any one of claims 1 to 3, characterized in that The fabric is a dense weave, a twill weave or a twill dense weave.

8. The fabric according to any one of claims 1 to 3, characterized in that The fabric is used as a fabric for adjusting back pressure of audio equipment.

9. The fabric according to claim 1, characterized in that The warp yarn and the weft yarn have a yarn diameter of 30 μm or more and 100 μm or less.

10. The fabric according to claim 1, characterized in that The yarn pitch (OP) of the fabric is 20 μm or less.

11. The fabric according to claim 1, characterized in that The open area (OPA) of the fabric is 15% or less.

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