JPH0536800B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an acoustic panel used for the wall surface of an acoustic room such as a hall.

[Prior Art] The phenomenon in which a direct sound is heard and then a reflected sound is heard separately in a hall or the like is called an echo, and is distinguished from reverberation. This reverberation is the worst of the indoor acoustic disturbances, and in order to prevent this, conventionally, walls that are prone to reverberation have been
As shown in FIG. 9, a sound absorbing surface 3 using glass wool 1 or a porous sound absorbing material 2 is used, or as shown in FIG. 10, a method of using a diffusion surface 4 such as a bent wall is generally adopted.

[Problems to be Solved by the Invention] However, although the former method definitely achieves the effect of preventing echoes, it also has a similar sound absorption effect on sounds incident from other directions than direct sound. The larger the area, the shorter the reverberation time. Further, there is a problem that the sound absorption power in the high frequency range becomes too large, resulting in poor balance in frequency characteristics.

In addition, in the latter method, if the folded walls have the same dimensions, the characteristics will be emphasized in a particular direction, which can easily cause acoustic disturbances in sound quality, so it is necessary to provide diffusion surfaces with various sizes. However, there is a problem in that the design and construction are extremely troublesome.

In view of the above circumstances, the present invention provides an acoustic panel that can effectively prevent reverberation, suppress reduction in reverberation time, prevent excessive sound absorption in the high frequency range, and is easy to design and construct. The purpose is to

[Means for Solving the Problems] The acoustic panel of the present invention is provided in order to solve the above problems, and is an acoustic panel used for the wall surface of the acoustic room of the hall 4, in which the surface extends in multiple directions. The structure is such that the entire surface has an uneven shape due to a large number of oriented sub-divided surfaces, and all or part of the surface orthogonal to the direction of direct sound incidence among these many sub-divided surfaces is used as a sound absorbing surface. It is characterized in that all or part of the surface of the subdivision surface that is inclined with respect to the direction of incidence of direct sound is a reflecting surface.

[Function] According to the acoustic panel of the present invention, the sound absorbing surface actively and efficiently absorbs direct sound from the sound source, and the reflecting surface reflects incident sound from other directions.

This effectively prevents echoes without extremely shortening the reverberation time.

Further, direct sound incident on the reflective surface is reflected in a direction different from the direction of incidence, and echoes caused by direct sound incident on the reflective surface are also prevented.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment.
The acoustic panel 10 of this embodiment is formed so that the surface as a whole has an uneven shape by subdivided surfaces 10a to 10d facing in a plurality of directions.
It is arranged at a slight interval from the wall surface of the concrete frame M.

The convex portions 11 and concave portions 12 on the surface of the acoustic panel 10 have a trapezoidal cross section and are formed alternately and regularly, and the top surfaces 10a of the convex portions 11 and the bottom surfaces 10c of the concave portions 12 are each flat and parallel to each other. The width of the top surface 10a of the convex portion 11 is set larger than the width of the bottom surface 10c of the concave portion 12.

The top surface 10a of the convex portion 11 is configured as a sound absorbing surface P having high sound absorbing properties by the glass wool 13 and the perforated plate 14 covering the glass wool 13, and the inner surfaces 10b, 10c, 10d of the concave portion 12
is a reflective surface Q that has high reflectivity due to the non-porous plate.
It is configured as.

In the acoustic panel 10 having such a configuration,
Sound incident perpendicularly to the sound absorbing surface P is well absorbed by this sound absorbing surface P. At this time, sound incident in the same direction is reflected by the reflective surface Q, but since most of the reflective surface Q faces in a different direction than the sound absorbing surface P, most of the reflected sound is reflected in a direction different from the incident sound. reflected and diffused. Furthermore, sound incident from other directions is not absorbed much by the sound absorbing surface P, and is accordingly reflected and diffused in various directions by the reflecting surface Q.

Therefore, although the effect of preventing echoes against sound incident perpendicularly to the sound absorbing surface P is high, the reverberation time is kept long to a certain extent. In addition, since the sound is reflected by the reflective surface Q, the sound absorption characteristics in the high frequency range are also improved by the third
As shown in the figure, this product is significantly improved compared to conventional products. Furthermore, since the dimensions of the subdivision surfaces 10a to 10d are set regularly, design and construction are easy.

In the above embodiment, the bottom surface 10c of the recess 12 parallel to the top surface 10a of the convex portion 11 is used as a reflective surface, but this surface 10c may also be used as a sound absorbing surface P.
In this case, all of the surfaces perpendicular to the specific direction become sound absorbing surfaces, so that most of the sound incident from the specific direction is effectively absorbed.

FIG. 4 shows an example in which the above acoustic panel 10 is oriented perpendicularly to the direction W in which direct sound is incident. When the acoustic panel 10 is installed in this manner, direct sound is perpendicularly incident on the sound absorbing surface P, so it goes without saying that the echo prevention effect becomes even higher.

FIG. 5 shows another embodiment of the invention. In the acoustic panel 20 of this example, the surface is formed into a step-like uneven shape by a large number of subdivided surfaces 20a to 20d facing in multiple directions, and the shape becomes more concave toward the bottom as it goes downward. It is formed. The top surfaces 20a of the convex portions 21 are all parallel, and the top surfaces 20a are the sound absorbing surfaces P, and the inner surfaces 20b to 20d of the concave portions 22 are the reflecting surfaces Q.
It is said that In the case of this embodiment, a large amount of sound incident perpendicularly to the sound absorbing surface P is absorbed by the front sound absorbing surface P. In addition, the remaining sound enters the recess 22,
This inner surface is a reflective surface Q, so it reflects,
Alternatively, it will diffuse while repeating reflections.

Further, as other embodiments, the structure may be constructed as shown in FIGS. 6 to 8. In the acoustic panel 30 of the embodiment shown in FIG. 6, the convex portion 31 is formed in a semicircular cross section, and the top surface 30a thereof is formed flat so as to be orthogonal to the direction of incidence of direct sound W to serve as a sound absorbing surface P. Further, the recessed portion 32 has a triangular cross section, and the side surface 30 of the convex portion 31
The entire area from b, 30e to the inner surfaces 30c, 30d of the recess 32 is a reflective surface Q. In this example, the subdivision surfaces 30b and 30e are curved surfaces.

Further, in the acoustic panel 40 of the embodiment shown in FIG. 7, large chevron-shaped convex portions 41 and small chevron-shaped convex portions 42 are arranged alternately, and a valley-shaped concave portion 43 is arranged between each convex portion 41 and 42. It is something. In this example, each of the slopes of the uneven portions 41, 42, and 43 is the subdivision surface 40a to 40a.
It is set to 0d. Of these slopes, surfaces 40a and 40c perpendicular to the direction of incidence of direct sound W are used as sound-absorbing surfaces P, and the other surfaces 40b and 40d are used as reflective surfaces. Also in this example, direct sound is effectively absorbed by the sound absorbing surface P, and sound incident from other directions is reflected by the reflecting surface Q.

Further, the acoustic panel 50 of the embodiment shown in FIG. 8 has two tall convex portions 51 on the upper side and a wall portion 52 protruding in a step-like manner on the lower side. It goes without saying that this stepped wall portion 52 also has an uneven shape as a whole. In this way, a large number of subdivided surfaces 50a facing multiple directions are formed.
Among the uneven surfaces formed by ~50f, surfaces 50a, 50d, orthogonal to the direction of incidence of direct sound W,
50f is the sound absorbing surface P, and the other surfaces 50b, 50
c, 50e is the reflective surface Q. In addition, the 6th
What is indicated by G in Figs. to 8 is glass wool.

[Effects of the Invention] As explained above, according to the acoustic panel of the present invention, direct sound from a sound source is actively and efficiently absorbed by the sound absorbing surface, and the direct sound is incident from a direction different from that of the direct sound. Since the sound is reflected by the reflective surface, echoes can be prevented without extremely shortening the reverberation time, and excessive sound absorption in the high frequency range can also be prevented.

In other words, since echoes can be effectively prevented and appropriate reverberations can be obtained, it is possible to enjoy performances in the hall extremely well.

In addition, unlike the case of folded walls, there is no need to form irregular diffusion surfaces with various sizes, and the dimensions can be set regularly, making design and construction easy and without damaging the aesthetics. Nor.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of one embodiment of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a characteristic diagram comparing the sound absorption characteristics of the acoustic panel of the embodiment and a conventional product, and Fig. 4 The figure is a side sectional view showing another construction example of the acoustic panel of the above embodiment, FIGS. 5 to 8 are side sectional views of other embodiments of the present invention, and FIGS. FIG. 3 is a cross-sectional view showing examples of acoustic panels. 10, 20, 30, 40, 50...acoustic panel, 10a-10d, 20a-20d, 30a-
30e, 40a to 40e, 50a to 50f...subdivision surface, P...sound absorbing surface, Q...reflecting surface.

Claims (1)

[Scope of Claims] 1. In an acoustic panel used on the wall surface of an acoustic room such as a hall, the surface is configured to have an uneven shape as a whole with a large number of subdivisions facing in a plurality of directions, and these many subdivisions All or part of the surfaces perpendicular to the direction of incidence of direct sound among the surfaces are used as sound absorbing surfaces, and all or part of the surfaces inclined with respect to the direction of incidence of direct sound among the plurality of subdivided surfaces are used as sound absorption surfaces. An acoustic panel characterized by having a reflective surface.