JPH0518796Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is rotatably attached to the wall of a listening room used for the development of acoustic products, etc., and its rotation operation reduces the reverberation time in the listening room. This invention relates to a variable reverberation device that can freely change its length.

(Prior Art) Usually, the length of the reverberation time of a listening room used for the development of acoustic products is changed by a reverberation variable device installed on the wall of the listening room.

As shown in FIG. 4, the reverberation variable device A' has a pillar-shaped reverberation variable body 2', one half of which is made of sound absorbing material and the other half of which is made of reflective material, which is rotatably mounted on wall surface m' of listening room M'. It is formed by multiple arrays.

Then, by rotating each of these reverberation variable bodies 2',
By changing the area ratio of the reflecting surface 2a' and the sound absorbing surface 2b' toward the listening room M' side, the sound absorption force can be increased or decreased, and the reverberation time of the listening room M' can be freely changed.

(Problem to be solved by the invention) However, in the above-mentioned reverberation variable device, since the reverberation variable bodies are arranged with a gap between adjacent parts, low frequency sound is sucked into the gap, and There was a problem in that plate vibration occurred on the reflective surface of the variable reverberation body, resulting in extremely poor reflectance of low-frequency sounds.

The present invention was devised in view of these problems, and its purpose is to provide a variable reverberation device with good reflectivity for low frequency sounds.

(Means for Achieving the Object) The configuration of the present invention as a means for achieving the above object is that a rotatable reverberation variable body in the form of a column is arranged horizontally adjacent to the wall surface of the listening room. In the installed reverberation variable device, the reflective surface of the reverberation variable body is formed of plywood made by sandwiching a lead layer between hard wood pieces and cement plywood, and adjacent both end portions of the reverberation variable body are overlapped with each other. The invention resides in a reverberation variable device characterized by the following.

(Function) According to the above configuration, the reflective surface of the reverberation variable body is formed of plywood made by sandwiching a lead layer between hard wood cement plywood, and the adjacent both end portions of the reverberation variable body are mutually connected. By overlapping the reverberation variables, it was possible to eliminate the gap between the reverberation variable bodies and prevent plate vibrations from occurring on the reflecting surface.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional view of the reverberation variable device A of the present invention, and the reverberation variable device A includes a concave housing portion 1 provided on the wall surface m of a listening room M, and a reverberation variable device A provided in the housing portion 1. It is composed of a variable body 2.

The accommodating portion 1 has a wavy back surface, and
Glass wool 1a is pasted on the entire inner surface, and a variable reverberation body 2 is provided in the opening 1b on the entire surface.

The reverberation variable body 2 is a hexagonal prism, and the rotation axis 2 on the upper and lower surfaces
c is pivotally supported on the upper and lower surfaces of the housing section 1, and is rotatably provided with the front surface slightly protruding into the listening room M from the wall surface m.

This rotation can be done manually or by a remotely controlled drive motor or the like.

Further, one half of the reverberation variable body 2 is a reflective surface 2a formed of a multilayer plywood 5 in which a lead layer 3 is sandwiched between hard wood cement plywood 4, and the other half is a reflective surface 2a formed by changing the density within the columnar body. Sound absorbing surface 2b formed by covering filled glass wool 7 with jersey cloth 8
Adjacent both end portions are overlapped with each other by engaging plates 10 protruding from the fixing plate 9.

The engagement plate 10 is protruded so that one side is shifted toward the reflective surface 2a and the other toward the sound absorbing surface 2b, and when the reflective surface 2a or the sound absorbing surface 2b is rotated toward the listening room M side, it can be moved forward and backward, respectively. are superimposed.

Further, a cushioning material 11 such as rubber is provided on each engagement plate 10 on the side of the sound absorbing surface 2b.

Further, engagement plates 10a are also provided on both side walls 1a of the accommodation portion 1 in a protruding manner via a fixed plate 9a, and are engaged with the engagement plates 10 of the variable reverberation bodies 2 on both sides.

By engaging the engaging bodies 10 of adjacent variable reverberation bodies 2 with each other, the variable reverberation bodies 10
The space in between is closed, and the reflecting surfaces 2a are in a state of being integrally connected.

When changing the reverberation variable body 2 from the reflective surface 2a to the sound absorption surface 2b as shown in FIG. 1, the adjacent reverberation variable body 2 is By rotating each other, the engaging bodies 10 normally engage with each other and close the space between the variable reverberation bodies 2.

For example, in FIG. 1, the first variable reverberation body 2 is rotated a quarter turn clockwise, the second variable reverberation body 2 is rotated one half turn clockwise, and the next variable reverberation body 2 is turned clockwise. further clockwise 4
When the reverberation variable body 2 is rotated by a half turn, the reverberation variable body 2 and the reverberation variable body 2 are rotated by a half turn. Then, the reverberation variable body 2 and the reverberation variable body 2 are rotated in the same manner as described above, and rotated in the order of .
The entire reverberation variable body 2 is rotated from the reflecting surface 2a to the sound absorbing surface 2b.

Furthermore, when changing the reverberation variable body 2 from the sound absorption surface 2b to the reflection surface 2a, the reverberation variable body 2 is sequentially rotated in the opposite direction to the above rotation, that is, in the order of... To go.

(Effects of the invention) The present invention has the following effects by having the above configuration.

The reflective surface of the reverberation variable body is formed of plywood in which a lead layer is sandwiched between hard wood cement plywood, and the adjacent both end portions of the reverberation variable body are overlapped with each other, so that the space between the reverberation variable bodies is In addition to blocking the space between the two, it is also possible to prevent plate vibrations occurring on the reflective surface, increasing the reflectivity of low frequency sounds, making it ideal for listening rooms from low frequencies (125Hz) to high frequencies (8KHz). The reverberation time of can be changed flatly.

The reflective surface of the reverberation variable body is formed of plywood in which a lead layer is sandwiched between hard wood cement plywood, and the adjacent both end portions of the reverberation variable body are overlapped with each other, so that the reverberation variable device is configured as a unit. Therefore, it has excellent workability and operability.

[Brief explanation of drawings]

Figure 1 is a sectional view of the reverberation variable device of the present invention, Figure 2 is an enlarged sectional view of the reverberation variable body, and Figure 3 is I of Figure 1.
-I line sectional view, FIG. 4 is a conventional sectional view. In the figure, A... Reverberation variable device, 2... Reverberation variable body, 2a... Reflective surface, 3... Lead layer, 4... Hard wood piece cement plywood, M... Listening room.

Claims (1)

[Scope of utility model registration request] In a reverberation variable device in which a rotatable reverberation variable body in the form of a column is arranged horizontally adjacent to the wall of a listening room, the reflective surface of the reverberation variable body is formed by replacing the lead layer with hard wood cement plywood. A reverberation variable device formed of sandwiched plywood, characterized in that adjacent both end portions of the reverberation variable body are overlapped with each other.