JP7113679B2 - Acoustic diffuser panel - Google Patents

Description

The present invention is an acoustic diffusion panel that is installed on a wall surface of a room such as a music practice room or a listening room, and diffuses sound generated in the room and reaching the wall surface, thereby improving the acoustic characteristics of the room. Regarding.

Conventionally, an acoustic block described in Patent Document 1, for example, is known as this type of acoustic diffusion panel. This acoustic block is configured by connecting a plurality of reflectors vertically and horizontally. Each reflector consists of a box-shaped side plate framed in a rectangular front shape and a state inclined inward of the box-shaped side plate. and a face plate provided with The surface plate is arranged along a plane including one front end portion and the other rear end portion of two side plates facing each other in the vertical or horizontal direction of the box-shaped side plate. As a result, the reflective surface, which is the front surface of the surface plate, is installed in the acoustic block so as to face a direction that is inclined with respect to the front thereof.

The acoustic block configured as described above is fixed to a wall surface in a room such as a living room. In the room, when sound is emitted from a sound source such as a speaker installed on the wall facing the acoustic block, the sound is reflected from the wall on which the speaker is installed by the reflection surface of each reflector of the acoustic block. They are reflected in different directions, specifically four different directions at maximum. However, in this acoustic block, the number of diffusion directions due to reflection is small, and in addition, the frequency band of sound that can be well diffused is also narrow. Therefore, an acoustic scatterer described in Patent Literature 2, for example, is known as an acoustic diffusion panel that enhances diffusivity and enables diffusion in a wider frequency band than the acoustic block described above.

The above acoustic scatterer has an almost kamaboko shape as a whole, and when installed on a wall surface in a room, the surface on the wall surface side is formed flat and the surface on the indoor side is arc-shaped. formed to protrude. In addition, four circular arc-shaped projections are provided so as to be continuous in the circumferential direction on the room-side surface of the acoustic scatterer. Further, the acoustic scattering body is made of a highly rigid and flame-retardant material, and is formed to extend along the wall surface to which it is attached while maintaining a solid shape and a constant cross-sectional shape and size. Furthermore, in the cross section of the acoustic scatterer, a plurality of predetermined isosceles triangles similar to each other are stacked on each hypotenuse, and the vertices of each of the four isosceles triangles on the uppermost stage are circular arcs. By being tied, the above-mentioned four convex portions are formed.

In the acoustic scatterer configured as described above, the base length and base angle are set so that the largest isosceles triangle as the base has good scattering characteristics for sound in a specific frequency band. be done. This acoustic scatterer has a structure in which similar isosceles triangles are laminated in two stages, so that the cross section is three times wider than the above-described base having only the isosceles triangles. Good scattering characteristics are obtained in the frequency band.

Japanese Unexamined Patent Application Publication No. 2000-110277 JP-A-2000-248659

Although the acoustic scatterer described above is capable of diffusing sound in a frequency band that is three times as wide as that in the case of having only an isosceles triangle as a base, only the diffusion of that frequency band is enough to reduce the acoustic characteristics of the room However, it cannot be said that it is sufficient to improve acoustic characteristics, for example, to improve acoustic characteristics by suppressing flutter echo and booming. That is, in the case of an acoustic scatterer having only an isosceles triangle as a base, if the frequency band of sound that can be diffused well is narrow, even if the acoustic scatterer is capable of diffusing three times the frequency band, As a whole, sound in a sufficiently wide frequency band cannot be diffused. Therefore, the acoustic scatterer described above is insufficient to effectively diffuse sound over a wide frequency band.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides an acoustic diffusion system capable of favorably diffusing sound in a wide frequency band, thereby improving indoor acoustic characteristics. The purpose is to provide a panel.

In order to achieve the above object, the invention according to claim 1 is an acoustic diffusion panel provided on a wall surface in a room for diffusing sound generated in the room and reaching the wall surface, The front surface is formed in the shape of an arc that protrudes further inward in the room as the front surface is closer to the center in the left-right direction. a diffusion panel body formed so that the width thereof varies continuously over the entire vertical direction, and installation means for installing the diffusion panel body at a predetermined position on the wall surface; The diffusion panel body is formed so that the width gradually decreases toward one side in the vertical direction, and both the left and right ends of the front shape of the diffusion panel body extend linearly in the vertical direction. characterized by

According to this configuration, the diffusion panel main body of the acoustic diffusion panel is installed at a predetermined position on the indoor wall surface by the installation means. The diffusion panel body extends along the wall surface for a predetermined length in the vertical direction, and is formed in the shape of an arcuate surface in which the closer the front surface is to the center in the horizontal direction , the more inwardly the interior of the room protrudes. In addition, the diffusion panel main body has a predetermined relationship between the width in the horizontal direction and the depth in the front-rear direction in the cross section, and the width in the horizontal direction changes continuously over the entire vertical direction. is formed in

In general, in an acoustic diffusion panel installed on a wall surface in a room, a diffusion panel body formed in an arcuate shape extending in the vertical direction and having a front surface protruding inward in the room has a cross-sectional shape and dimensions, The following relational expressions (1), (2) and (3) are established between the frequency of sound that can be diffused well.
W≈λ (1)
D=0.15W to 0.3W (2)
F=S/λ (3)
W: Width in the lateral direction in the cross section of the diffusion panel main body λ: Wavelength of sound D: Depth in the front-back direction in the cross section of the diffusion panel main body F: Frequency of diffused sound S: Sound speed in air

Since the speed of sound S in the above relational expression (3) is a constant value (340 m/s), according to the relational expressions (1) and (3), the longer the wavelength λ of the sound, the The greater the width W in the horizontal direction, the lower the frequency F of the diffused sound, while the smaller the width W, the higher the frequency F of the diffused sound. In other words, the horizontal width W of the diffusion panel main body in the cross section varies continuously over the entire vertical direction, thereby widening the frequency band of sound that can be diffused satisfactorily by a single diffusion panel main body. be able to. Further, in this case, the depth D in the front-rear direction in the cross section of the diffusion panel main body changes according to the width W in the left-right direction, which changes in the up-down direction, by satisfying the relational expression (2).

As described above, by installing the diffusion panel main body on the wall surface of the room, the sound generated in the room and reaching the wall surface can be diffused satisfactorily in a wide frequency band. As a result, when a musical instrument is played indoors and sound is generated in the room, flutter echoes and booming can be effectively suppressed, and the acoustic characteristics of the room can be improved.

Further, according to the above configuration, the lateral width of the diffusion panel main body in the transverse cross section is formed so as to gradually decrease in one direction in the vertical direction, and the left and right ends of the front shape of the diffusion panel main body are formed vertically. By extending linearly in the direction, the front shape of the diffusion panel main body is formed, for example, in a trapezoidal shape. In this way, the diffusion panel main body whose width in the horizontal direction in the cross section changes continuously in the vertical direction can be configured with a relatively simple shape.

The invention according to claim 2 is the acoustic diffusion panel according to claim 1, wherein the predetermined relationship is D = 0.15 W to 0.3 W, where W is the width and D is the depth. Characterized by

According to this configuration, the relationship between the width W in the lateral direction in the cross section of the diffusion panel body and the depth D in the front-to-back direction in the cross section of the diffusion panel body satisfies the above-described relational expression (2). The effect of claim 1 described above can be ensured by changing the depth D within the above range in accordance with the width W that changes over the entire area.

The invention according to claim 3 is the acoustic diffusion panel according to claim 1 or 2 , wherein the diffusion panel main body is made of a wooden board material having a predetermined thickness, and is curved convexly toward the inside of the room. characterized by having a curved panel that

According to this configuration, the diffusion panel main body is constructed using a curved panel that is made of a wooden board material having a predetermined thickness and is curved in a convex shape, so that the diffusion panel main body can be manufactured relatively inexpensively and easily. be able to.

The invention according to Claim 4 is the acoustic diffusion panel according to any one of Claims 1 to 3 , wherein the installation means comprises a locking member provided near the upper end of the wall surface and an upper end portion of the diffusion panel main body. and a latch for detachably latching onto the latch member.

According to this configuration, a latch is provided on the upper end of the diffusion panel body, and the diffusion panel body is secured by latching the latch to a locking member provided near the upper end of the wall surface. It can be easily installed on the wall surface. In addition, since the above-mentioned latches can be attached to and detached from the retaining member on the wall surface side, the diffusion panel main body can be easily attached to and detached from the wall surface.

The invention according to claim 5 is the acoustic diffusion panel according to claim 4 , wherein the upper surface of the diffusion panel main body is formed so as to be inclined forward and downward toward the interior of the room. .

According to this configuration, the upper surface of the diffusion panel main body is inclined forward and downward toward the interior of the room, so that, for example, the locking member on the wall surface side can be seen from the line of sight of the operator who attaches and detaches the diffusion panel main body. is relatively high, it is easier for the operator to see the latches on the upper end of the diffuser panel body. As a result, the fasteners can be easily latched to and removed from the locking member, and as a result, the diffusion panel main body can be attached to and detached from the wall surface even more easily. It can be carried out.

The invention according to claim 6 is the acoustic diffusion panel according to claim 4 or 5 , wherein the locking member is configured to be movable in the left-right direction along the wall surface.

According to this configuration, since the locking member is movable in the horizontal direction along the wall surface, the diffusion panel body can be removed from the locking member when the installation position of the diffusion panel body needs to be changed. The installation position can be easily changed by moving in the left-right direction along the wall surface together with the locking member. Therefore, the diffusion panel main body can be easily installed at a more appropriate position according to the position of the sound generated in the room.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the state which the diffusion panel for acoustics by one Embodiment of this invention was installed in the practice room of the grand piano, (a) is a top view, (b) shows the state which looked at the rear wall from the front. In the practice room of FIG. 1, (a) shows the left wall viewed from the front, and (b) shows the right wall viewed from the front. FIG. 2 shows an acoustic diffusion panel, where (a) is a front view, (b) is a cross-sectional view taken along line bb, and (c) is a cross-sectional view taken along line cc. FIG. 2 is a perspective view showing an exploded acoustic diffusion panel;

Preferred embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1(a) is a plan view showing a state in which an acoustic diffusion panel 1 according to one embodiment of the present invention is installed in a practice room 3 of a grand piano 2, and FIG. 2(a) and 2(b) show the left wall 4L and right wall 4R of the practice room 3 when viewed from the front of the walls 4B, 4L and 4R, respectively. ing. As shown in FIG. 1(a), the practice room 3 has a slightly elongated rectangular plane shape, and a grand piano 2 is installed close to the left wall 4L and near the rear wall 4B. .

As shown in FIGS. 1(a) and 1(b), the rear wall 4B has two acoustic diffusion panels 1, 1 arranged side by side in the left-right half of the wall surface. Further, as shown in FIGS. 1(a) and 2(a), the left wall 4L is provided with a single acoustic diffusion panel 1 at its left end. The acoustic diffusion panel 1 on the left wall 4L is positioned on the left side of the player playing the grand piano 2. As shown in FIG. Furthermore, as shown in FIGS. 1(a) and 2(b), on the right wall 4R, three acoustic diffusion panels 1, 1, 1 are arranged side by side in the left-right direction on approximately the left half of the wall surface. A door 5 for opening and closing the entrance of the practice room 3 is provided on the right side of them. Unlike the other walls 4B, 4L and 4R, the front wall 4F of the practice room 3 is not provided with the acoustic diffusion panel 1. As shown in FIG.

3 shows a front view and a cross-sectional view of the acoustic diffusion panel 1, and FIG. 4 shows the acoustic diffusion panel 1 in an exploded view. As shown in FIG. 3(a), this acoustic diffusion panel 1 is provided on a wooden diffusion panel body 7 and at least one of its upper and lower ends, and hooks 21, which will be described later, on the walls 4B, 4L and 4R. It is provided with a latching tool 8 which is detachably latched.

The diffusion panel main body 7 includes a frame 11 having a trapezoidal planar shape, a curved panel 12 attached to the frame 11 and curved in a convex shape, and a gap between the upper and lower ends of the curved panel 12 and the frame 11. It has two lids (hereinafter referred to as "small lid 13" and "large lid 14") for closing the lid.

Each of the frames 11 is made of an elongated plate material, and includes an upper member 11a and a lower member 11b extending parallel to each other, and a left member 11c and a right member 11d connecting the ends of the upper member 11a and the lower member 11b. It is formed in a relatively long trapezoidal shape (for example, upper base: 752 mm, lower base: 200 mm, height: 1300 mm).

The curved panel 12 is made of a plate material having a predetermined thickness (for example, 3 mm), has a trapezoidal planar shape that is substantially the same as the frame 11, and is formed so as to be convexly curved on the opposite side of the frame 11. . Further, the left and right ends of the curved panel 12 are attached to the left member 11c and the right member 11d of the frame 11 by adhesion or the like. Further, as shown in FIG. 3(a), the upper and lower ends of the curved panel 12 are formed in an arcuately recessed state.

The small lid 13 and the large lid 14 are made of a plate material having a predetermined thickness (5.5 mm to 9 mm) and are formed in a bow shape in plan view. The small lid 13 is attached to the lower member 11b of the frame 11 and the lower end portion of the curved panel 12 by adhesion or the like. On the other hand, the large lid 14 is attached to the top member 11a of the frame 11 and the upper end portion of the curved panel 12 by adhesion or the like. As shown in FIGS. 3(a) and 3(b), the large lid 14 is tilted forward (to the left in FIG. 3(b)), and the small lid 13 is , in a posture inclined forward and upward.

In the diffusion panel main body 7, the shape and dimensions of the cross section have the above-described predetermined relationship so that sound in a wide frequency band can be diffused satisfactorily. That is, as shown in FIG. 3B, W is the width in the lateral direction of the diffusion panel main body 7 in the cross section, D is the depth in the front-rear direction in the cross section of the diffusion panel main body 7, and λ is the wavelength of sound. , where F is the frequency of the diffused sound, and S is the speed of sound in air, the following relational expressions (1), (2) and (3) are established, so that the diffusion panel body 7 has a wide frequency band. It is designed for good sound diffusion.
W≈λ (1)
D=0.15W to 0.3W (2)
F=S/λ (3)

Since the speed of sound S in the above relational expression (3) is a constant value (340 m/s), according to the relational expressions (1) and (3), the longer the wavelength λ of the sound, that is, the cross section of the diffusion panel body 7 The greater the width W in the left-right direction, the lower the frequency F of the diffused sound, while the smaller the width W, the higher the frequency F of the diffused sound. That is, as shown in FIGS. 3(a) and 3(c), the horizontal width W of the diffusion panel main body 7 in the cross section changes continuously over the entire vertical direction, so that a single diffusion panel The frequency band of sound that can be well diffused by the body 7 is widened. Further, as shown in FIGS. 3B and 3C, the depth D in the front-rear direction in the cross section of the diffusion panel body 7 satisfies the relational expression (2), and the width W in the left-right direction, which varies in the up-down direction. is changing accordingly. In addition, in the diffusion panel main body 7 of the present embodiment, the coefficient (0.15 to 0.3) by which the width W is multiplied when obtaining the depth D is set to a constant value (eg, 0.2). there is

The latches 8 provided at the upper and lower ends of the diffusion panel main body 7 are fixed near the longitudinal centers of the upper member 11a and the lower member 11b of the frame 11, respectively. Each latch 8 is made of metal and has a hook-shaped tip, for example.

As shown in FIGS. 1(b), 2(a), and 2(b), the acoustic diffusion panel 1 configured as described above has upper ends of the rear wall 4B, the left wall 4L, and the right wall 4R. It is attached via a hook 8 to a hook 21 provided nearby.

Specifically, as shown in FIG. 1B, the rear wall 4B has a left diffusion panel body 7 tapered downward and a right diffusion panel body 7 tapered upward. It is installed so that Further, as shown in FIG. 2(a), a diffusion panel body 7 is installed on the left wall 4L so as to taper downward. Further, as shown in FIG. 2(b), on the right wall 4R, the left and right diffusion panel bodies 7, 7 taper upward, and the central diffusion panel 7 tapers downward. yes, it is installed.

Rails 22 extending in the left-right direction are fixed to the upper end portions of the rear wall 4B, the left wall 4L and the right wall 4R. It is movably engaged along the length direction. Therefore, when it becomes necessary to change the installation position of the diffusion panel main body 7 installed on each of the walls 4B, 4L and 4R, the diffusion panel main body 7 can be moved left and right along the wall surface together with the hooks 21 without being removed from the hooks 21 . By moving in the direction, the installation position can be easily changed.

Rail cover walls 20B, 20L, and 20R are provided on the ceilings near the upper ends of the rear wall 4B, left wall 4L, and right wall 4R to cover the corresponding rails 22 by hanging forward from the respective wall surfaces at a predetermined distance. ing. Since the rail cover walls 20B, 20L and 20R cover the rails 22, the appearance of the upper ends of the walls 4B, 4L and 4R can be maintained better than when the rails 22 are exposed.

As described in detail above, according to the acoustic diffusion panel 1 of the present embodiment, the diffusion panel main body 7 configured as described above is installed on the wall surface of the practice room 3, thereby making the grand piano 2 It is possible to satisfactorily diffuse sounds in a wide frequency band in sounds generated in a room such as performance sounds and reaching the wall surface side. As a result, flutter echoes and booming can be effectively suppressed, and acoustic characteristics in the practice room 3 can be improved.

When the diffusion panel main body 7 is installed on or removed from the rear wall 4B, the left wall 4L, and the right wall 4R, the upper end of the diffusion panel main body 7 is lowered forward by the small lid 13 or the large lid 14. Since it is slanted, even if there are rail cover walls 20B, 20L and 20R near the upper ends of the respective walls 4B, 4L and 4R, the hooks 21 are more visible than the line of sight of the operator who attaches and detaches the diffusion panel body 7. Even at a high position, the operator can easily see the latch 8 at the upper end of the diffusion panel body 7.例文帳に追加This makes it possible to easily attach and detach the diffusion panel main body 7 to and from the walls 4B, 4L, and 4R.

It should be noted that the present invention is not limited to the above described embodiments and can be implemented in various ways. For example, in the embodiment, the diffusion panel main body 7 of the acoustic diffusion panel 1 is made of wood, but the present invention is not limited to this. Various materials (eg, synthetic resin) can also be used. In addition, although the diffusion panel main body 7 has a hollow interior, it is also possible to absorb sound in addition to diffusing sound by, for example, filling the diffusion panel main body 7 with a sound absorbing material. be. Furthermore, the number of diffusion panel main bodies 7 installed on each wall 4B, 4L, and 4R and the vertical direction thereof can be appropriately changed according to the acoustic characteristics required for the practice room 3. FIG.

Further, the detailed configuration of the diffusion panel main body 7 shown in the embodiment is merely an example, and can be appropriately changed within the scope of the present invention.

1 Acoustic Diffusion Panel 3 Practice Room 4B Rear Wall 4L Left Wall 4R Right Wall 4F Front Wall 7 Diffusion Panel Body 8 Fastener (Installation Means)
11 Frame 12 Curved panel 13 Small lid 14 Large lid 21 Hook (locking member)
22 Rail W Width in the lateral direction of the diffusion panel main body in cross section λ Wavelength of sound D Depth in the cross section of the diffusion panel main body F Frequency of sound S Sound speed in air

Claims (6)

An acoustic diffusion panel provided on a wall surface of a room for diffusing sound generated in the room and reaching the wall surface,
It extends along the wall surface for a predetermined length in the vertical direction, and is formed in an arcuate shape that protrudes further inward of the room as the front surface is closer to the center in the horizontal direction. a diffusion panel body having a predetermined relationship with the depth in the direction and formed so that the width varies continuously over the entire vertical direction;
installation means for installing the diffusion panel main body at a predetermined position on the wall surface;
and
The diffusion panel main body is formed such that the width gradually decreases toward one of the vertical directions, and the left and right end portions of the front shape of the diffusion panel main body extend linearly in the vertical direction. Diffusion panel for acoustics. 2. The acoustic diffusion panel according to claim 1 , wherein the predetermined relationship is D=0.15W to 0.3W, where W is the width and D is the depth. 3. The diffusion panel body according to claim 1 , wherein the diffusion panel main body is made of a wooden plate material having a predetermined thickness, and has a curved panel convexly curved toward the interior of the room. acoustic diffusion panels. The installation means is
a locking member provided near the upper end of the wall surface;
a latch provided at the upper end of the diffusion panel body for detachably latching onto the latch member;
The acoustic diffusion panel according to any one of claims 1 to 3 , characterized by comprising: 5. The acoustic diffusion panel according to claim 4 , wherein the upper surface of the diffusion panel main body is formed so as to be inclined downward toward the interior of the room. 6. The acoustic diffusion panel according to claim 4 , wherein the locking member is configured to be movable in the left-right direction along the wall surface.

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