JP2011053252A - Acoustic panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic panel which facilitates impedance matching with air even though it is simple in structure, in which is easy, and can linearly adjust acoustic resistance. <P>SOLUTION: In the acoustic panel 10 including a plate form panel body 11 which consists of predetermined sound resistance materials, a plurality of projections 12 and 13 of a wedge shape in which a cross section gradually decreases to a separating direction from its panel face, are arranged with predetermined intervals, in a panel body 11. A sound transformer T which consists of sound wave paths of a speaker cone shape is formed between adjoining projections 12 and 12, and projections 13 and 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an acoustic panel installed in a listening room or the like, and more particularly to an acoustic panel that can easily match impedance with air.

  For example, when designing a listening room or the like, an acoustic panel is selected in consideration of the characteristics of reflection, scattering, and absorption so that the sound quality of sound waves emitted from a sound source such as a speaker is good for the listener. .

  By the way, if the impedance of an acoustic panel and air differs greatly, an acoustic panel will operate | move as a reflecting plate and a sound wave will not permeate | transmit or absorb.

  This point can be solved by increasing the thickness of the acoustic resistance material having a low acoustic resistance value to obtain the desired acoustic resistance, but this requires a large space in the thickness direction and is not a preferable measure. .

  In addition, Patent Document 1 proposes a sound-absorbing material in which a powder that exhibits sound-absorbing performance by vibration of particles is filled in an acoustically transparent bag.

  In Patent Document 2, a sound absorbing plate that absorbs and transmits sound, a sound wave interference air layer that causes sound to interfere and attenuate, and a reflector that reflects sound waves are viewed in this order from the sound source side. A sound absorbing panel housed in a frame has been proposed.

  According to the invention described in Patent Document 1, a sound-absorbing material having a thickness of 5 mm or less can be obtained. However, since a strict and special specification is required for the powder used, its production including the cost is not easy. There is no problem.

  In addition, according to the invention described in Patent Document 2, although a sound absorbing panel that provides excellent sound absorbing performance is provided by suppressing reflection of sound waves on the front surface and reverberation from the back surface, many components are required. Therefore, it cannot be denied that the configuration is complicated and expensive.

JP-A-9-114468 JP 2000-309989 A

  Accordingly, an object of the present invention is an acoustic panel installed in a listening room or the like, which has a simple configuration, but is easy to match impedance with air and has a configuration capable of linearly adjusting acoustic resistance. Is to provide.

  In order to solve the above problems, the present invention provides an acoustic panel including a plate-like panel body made of a predetermined acoustic resistance material, wherein at least one surface of the panel body has a cross-sectional area along a direction away from the panel surface. A plurality of protrusions having a substantially wedge shape that gradually decreases are arranged at a predetermined interval, and an acoustic transformer including a speaker cone-like sound wave path is formed between the adjacent protrusions.

  According to a preferred aspect of the present invention, the acoustic transformer is formed on both surfaces of the panel body.

  In the present invention, the panel body is preferably compressible in the plate thickness direction.

  Moreover, it is preferable that the acoustic transformer on the other surface side of the panel main body is arranged so as to be shifted by a predetermined distance along the panel surface of the panel main body with respect to the acoustic transformer on one surface side of the panel main body.

  The present invention includes a mode in which the plurality of protrusions are arranged in parallel with each other and a mode in which the plurality of protrusions are concentrically arranged.

  According to the present invention, an acoustic transformer including a speaker cone-shaped sound path is formed on at least one side (sound receiving surface) of the panel body, and the acoustic transformer is a panel body corresponding to the “throat” of the speaker cone. The part with the reduced cross-sectional area on the side shows high acoustic resistance, while the part with a large cross-sectional area corresponding to the "opening" of the speaker cone does not differ greatly from free space and acoustic impedance, so the panel body is high Even if it has an acoustic resistance, it operates as an acoustic resistance that hardly reflects incoming sound waves.

  Further, the panel main body is compressed in the plate thickness direction, and / or the acoustic transformer on the other surface side of the panel main body is set along the panel surface of the panel main body with respect to the acoustic transformer on one surface side of the panel main body. The acoustic resistance can be linearly adjusted by disposing the distance.

The typical perspective view showing the acoustic panel by the present invention. Sectional drawing which expands and shows a part of said acoustic panel. Sectional drawing which shows two examples which adjust the acoustic resistance of the said acoustic panel.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited to this.

  First, referring to FIG. 1 and FIG. 2, an acoustic panel 10 of the present invention includes a plate-like panel main body 11 made of a predetermined acoustic resistance material. In this embodiment, a plurality of protrusions are formed on both sides of the panel main body 11. Objects 12 and 13 are provided, and the sound transformers T are formed on both surfaces of the panel body 11 by these protrusions 12 and 13.

  For the panel body 11, an acoustic resistance material having appropriate air permeability and elasticity such as sponge or nonwoven fabric having open cells is preferably used.

  As shown in FIG. 2, the protrusions 12 and 13 have a substantially wedge shape in which the cross-sectional area on the panel surface side of the panel body 11 is large and the cross-sectional area gradually decreases along the direction away from the panel surface.

  The protrusions 12 and 13 have the same shape (same shape and size), and are preferably formed of a material that does not transmit sound waves such as wood or synthetic resin.

  In this embodiment, the protrusions 12 and 13 are oriented in the horizontal direction (horizontal direction), and they are arranged in a plurality of rows in parallel with each other at a predetermined interval. The protrusions 12 and 13 are arranged symmetrically on both sides of the panel body 11.

  Unlike this embodiment, the protrusions 12 and 13 may be arranged in the vertical direction (vertical direction) or in an oblique direction. In some cases, the protrusions 12 and 13 may be arranged concentrically.

  As shown in FIG. 2, since each protrusion 12, 13 is wedge-shaped, there is a speaker cone-like (bangle-like) space between adjacent protrusions 12, 12 and between adjacent protrusions 13, 13. In this specification, this speaker cone-shaped space is referred to as an “acoustic transformer (reference symbol T)”.

  In this acoustic transformer T, a portion Ta in which the cross-sectional area on the side of the panel body 11 corresponding to the “throat” of the speaker cone is reduced exhibits high acoustic resistance, while the cross-sectional area corresponding to the “opening” of the speaker cone is large. In the portion Tb, the acoustic impedance does not differ greatly from the free space, so that even if the panel body 11 has a high acoustic resistance, it operates as an acoustic resistance that hardly reflects incoming sound waves.

  For example, assuming that a sound source such as a speaker is on the left side of FIG. 2, sound waves from the sound source indicated by an arrow pass through a passage in which the cross-sectional area is gradually narrowed from the opening Tb of the acoustic transformer T on the protrusion 12 side. To the department.

  The acoustic impedance at the throat portion Ta is quite high, and is almost matched with the acoustic impedance of the panel body 11, so that it enters the panel body 11 with almost no reflection, and enters the panel body 11 After being attenuated by the acoustic resistance, the acoustic transformer T on the projection 13 side exits.

  The acoustic panel 10 basically includes the above-described configuration, but the acoustic resistance can be adjusted linearly. Two examples will be described with reference to FIG.

  First, as a first example, as shown in FIG. 3A, the panel body 11 is compressed in the plate thickness direction to make the acoustic resistance of the panel body 11 variable.

  In order to realize this, a not-shown rough pressing plate having an acoustic resistance of almost zero, for example, is attached to both surfaces of the panel main body 11, and a compressive force is applied to the panel main body 11 through the pressing plate. . In this case, the protrusions 12 and 13 are arranged on the pressing plate.

  Next, as a second example, as shown in FIG. 3B, a projection 12 disposed on one surface of the panel body 11 and a projection 13 disposed on the other surface are formed on the panel surface. The acoustic resistance of the panel body 11 is made variable by relatively shifting the position along the passage path length of the sound wave in the panel body 11.

  To achieve this, for example, two not-shown coarse plate members having an acoustic resistance of almost zero are prepared, and the projections 12 and 13 are attached in advance to the plate members, and the plate members are attached to the panel body. What is necessary is just to arrange | position so that it can slide to the surface direction on both surfaces of 11. FIG.

  In the above-described embodiment, the acoustic transformers with the projections are formed on both surfaces of the panel body 11, but the acoustic transformers with the projections may be formed only on one side (sound receiving surface) side of the panel body 11.

10 Acoustic Panel 11 Panel Body 12, 13 Projection T Acoustic Transformer

Claims (6)

In an acoustic panel having a plate-like panel body made of a predetermined acoustic resistance material,
A plurality of substantially wedge-shaped projections whose cross-sectional area gradually decreases along a direction away from the panel surface are arranged at a predetermined interval on at least one surface of the panel body, and a speaker cone-shaped projection is formed between the adjacent projections. An acoustic panel in which an acoustic transformer including a sound wave passage is formed.   The acoustic panel according to claim 1, wherein the acoustic transformer is formed on both surfaces of the panel body.   The acoustic panel according to claim 1, wherein the panel main body is compressible in a plate thickness direction.   The acoustic transformer on the other surface side of the panel body is arranged to be shifted by a predetermined distance along the panel surface of the panel body with respect to the acoustic transformer on one surface side of the panel body. Item 4. The acoustic panel according to Item 2 or 3.   The acoustic panel according to any one of claims 1 to 4, wherein the plurality of protrusions are arranged in parallel to each other in a multi-row shape.   The acoustic panel according to any one of claims 1 to 4, wherein the plurality of protrusions are concentrically arranged.

Images