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US-20260125829-A1 - WOVEN FABRIC

US20260125829A1US 20260125829 A1US20260125829 A1US 20260125829A1US-20260125829-A1

Abstract

Provided is a woven fabric that effectively prevents sound leakage to the outside and intrusion of external noise and has little variation in the acoustic property when used as a woven fabric for adjusting the back pressure of a speaker, earphones, and the like. Provided is a woven fabric including a warp thread and a weft thread, the woven fabric having a airflow resistance of 0.3 kPa·s/m or more and 5 kPa·s/m or less, and the woven fabric having a tolerance of the airflow resistance within ±10%. In the woven fabric, at least one of the warp thread and the weft thread is a multifilament thread. In the woven fabric, the multifilament thread is a non-twisted thread without twists.

Inventors

  • Masayuki Yamaguchi
  • Makoto Takiguchi
  • Kaori Kamata
  • Shin Hasegawa
  • Nobukazu Motojima

Assignees

  • NBC MESHTEC INC.

Dates

Publication Date
20260507
Application Date
20231003
Priority Date
20221007

Claims (18)

  1. 1 . A woven fabric comprising a warp thread and a weft thread, the woven fabric having a airflow resistance of 0.3 kPa·s/m or more and 5 kPa·s/m or less, and the woven fabric having a tolerance of the airflow resistance within ±10%.
  2. 2 . The woven fabric according to claim 1 , wherein at least one of the warp thread and the weft thread is a multifilament thread.
  3. 3 . The woven fabric according to claim 1 , wherein the warp thread and the weft thread are multifilament threads.
  4. 4 . The woven fabric according to claim 2 , wherein the multifilament thread is a non-twisted thread without twists.
  5. 5 . The woven fabric according to claim 2 , wherein a single thread that constitutes the multifilament thread has a cross-sectional shape that is any of a circular shape, an elliptical shape, a polygonal shape in which each internal angle is less than 180 degrees, and a substantially polygonal shape in which each corner of the polygonal shape has an R shape.
  6. 6 . The woven fabric according to claim 2 , wherein a variation in an apparent thread diameter of the multifilament thread when the woven fabric is viewed from a airflow direction thereof is 5% or less.
  7. 7 . The woven fabric according to claim 1 , which is dutch woven, twill woven, or twill dutch woven.
  8. 8 . The woven fabric according to claim 1 , which is used as a woven fabric for adjusting a back pressure of an acoustic device.
  9. 9 . The woven fabric according to claim 1 , wherein the warp thread and the weft thread have a thread diameter of 30 μm or more and 100 μm or less.
  10. 10 . The woven fabric according to claim 1 , having an opening (OP) of 20 μm or less.
  11. 11 . The woven fabric according to claim 1 , having an opening area (OPA) of 15% or less.
  12. 12 . The woven fabric according to claim 3 , wherein the multifilament thread is a non-twisted thread without twists.
  13. 13 . The woven fabric according to claim 3 , wherein a single thread that constitutes the multifilament thread has a cross-sectional shape that is any of a circular shape, an elliptical shape, a polygonal shape in which each internal angle is less than 180 degrees, and a substantially polygonal shape in which each corner of the polygonal shape has an R shape.
  14. 14 . The woven fabric according to claim 3 , wherein a variation in an apparent thread diameter of the multifilament thread when the woven fabric is viewed from a airflow direction thereof is 5% or less.
  15. 15 . The woven fabric according to claim 2 , which is dutch woven, twill woven, or twill dutch woven.
  16. 16 . The woven fabric according to claim 3 , which is dutch woven, twill woven, or twill dutch woven.
  17. 17 . The woven fabric according to claim 2 , which is used as a woven fabric for adjusting a back pressure of an acoustic device.
  18. 18 . The woven fabric according to claim 3 , which is used as a woven fabric for adjusting a back pressure of an acoustic device.

Description

TECHNICAL FIELD The present invention relates to a woven fabric used in an acoustic device such as a speaker or earphones. BACKGROUND ART In general, in an acoustic device such as a so-called closed-type speaker, earphones, or a headphone, an air chamber behind a diaphragm is closed, and movement of a sounding portion (diaphragm) is restricted by a change in atmospheric pressure, so that originally intended sound cannot be generated. Therefore, a back pressure adjustment function called a vent is provided to adjust the pressure (back pressure) inside the device. The vent has a small number of airflow holes for adjusting the back pressure and is required to have a function capable of preventing sound leakage to the outside or preventing intrusion of noise from the outside. Conventionally, an acoustic member that is a plate made of plastic or metal, a film-like fiber structure, or the like and has a airflow property owing to a airflow portion such as a plurality of small holes is attached to the airflow holes connecting the inside and the outside of such an acoustic device. Patent Literature 1 discloses a laminated fiber structure in which a single thread fiber material is bonded to a polymer film and that is used in an acoustic component, and describes an application example in which the laminated fiber structure is attached to the back side of earphones. CITATION LIST Patent Literature Patent Literature 1: JP 2013-526172 A SUMMARY OF INVENTION Technical Problems However, the lamination of a fiber structure and a film as in Patent Literature 1 requires a bonding portion between the fiber structure and the film, and a airflow portion is blocked at the bonding portion. When the fiber structure is used in an acoustic device such as small earphones, a part of the fiber structure is cut off from the laminated fiber structure and used, and the number of bonding portions varies depending on the portion to be cut, resulting in a variation in the airflow property. The variation in the airflow property results in problems such as a variation in the acoustic property between the right and left sides of the earphones. The present invention has been made to solve such conventional problems, and it is an object of the present invention to provide a woven fabric that effectively prevents sound leakage to the outside and intrusion of external noise and has little variation in the acoustic property when used as a woven fabric for adjusting the back pressure of a speaker, earphones, and the like. Solution to Problems The gist of the present invention is as follows. (1) A woven fabric including a warp thread and a weft thread, the woven fabric having a airflow resistance of 0.3 kPa·s/m or more and 5 kPa·s/m or less, and the woven fabric having a tolerance of the airflow resistance within ±10%. (2) The woven fabric according to (1), wherein at least one of the warp thread and the weft thread is a multifilament thread. (3) The woven fabric according to (1), wherein the warp thread and the weft thread are multifilament threads. (4) The woven fabric according to (2) or (3), wherein the multifilament thread is a non-twisted thread without twists. (5) The woven fabric according to (2) or (3), wherein a single thread that constitutes the multifilament thread has a cross-sectional shape that is any of a circular shape, an elliptical shape, a polygonal shape in which each internal angle is less than 180 degrees, and a substantially polygonal shape in which each corner of the polygonal shape has an R shape. (6) The woven fabric according to (2) or (3), wherein a variation in an apparent thread diameter of the multifilament thread when the woven fabric is viewed from a airflow direction thereof is 5% or less. (7) The woven fabric according to any one of (1) to (3), which is dutch woven, twill woven, or twill dutch woven. (8) The woven fabric according to any one of (1) to (3), which is used as a woven fabric for adjusting the back pressure of an acoustic device. (9) The woven fabric according to (1), wherein the warp thread and the weft thread have a thread diameter of 30 μm or more and 100 μm or less. (10) The woven fabric according to (1), having an opening (OP) of 20 μm or less. (11) The woven fabric according to (1), having an opening area (OPA) of 15% or less. Advantageous Effects of Invention According to the present invention, it is possible to provide a woven fabric that effectively prevents sound leakage to the outside and intrusion of external noise and has little variation in the acoustic property when used as a woven fabric for adjusting the back pressure of a speaker, earphones, and the like. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram illustrating a configuration of a woven fabric 1 of the present embodiment. FIG. 2 is a drawing illustrating a part of a multifilament thread when the woven fabric 1 is viewed from the airflow direction thereof. DESCRIPTION OF EMBODIMENTS In the following, embodiments of th