JPH04107098A - Speaker box for back load horn - Google Patents

Abstract

PURPOSE:To obtain a speaker box for a back load horn by forming a hollow body having a desired curving shape independently, and surrounding the outer periphery of the hollow body with the concrete layer of a prescribed thickness. CONSTITUTION:After setting a hollow body 1 formed in the desired curving shape in a rectangular molding flask 2, a concrete material 3' necessary for surrounding the outer periphery except the opening part of the hollow body 1 is poured into the molding flask 2 and the concrete material 3' is hardened, and the hollow body 1 and a concrete layer 3 of the prescribed thickness are integrated into a dual construction, then it is possible to produce easily a main body 4 of a box made from the concrete. At the same time, without any post- processing, it is possible to form a sound path 5 of the desired curving shape formed by the hollow body 1 inside the main body 4 made from the concrete automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION ``Industrial Application Field'' The present invention relates to an improvement of a speaker box for a backloaded horn having a complexly curved sound path inside the main body.

``Conventional technology'' Among audiophiles, even in small speaker units, the high and mid-range sounds emitted from the front of the speaker unit are directly radiated, and the low sounds emitted from the rear are reproduced automatically through a long sound path. The backload horn system is attracting a lot of attention because of its advantages such as being able to improve the sense of volume.

For this reason, various attempts have been made to develop speaker boxes used in such backload horn systems.
Since the speaker box must have a long, complexly curved sound path inside it to amplify the bass, the formation of this sound path imposes various design and manufacturing restrictions. .

Therefore, at present, ongaku no tomosha Co., Ltd.
As described in "Rstereo (June 1989 issue)", wooden planks such as lauan plywood and Chinese plywood are cut into specified dimensions, and the planks of each size are assembled as appropriate using nails, adhesive, etc. By forming a box-shaped box body, a sound path for bass amplification is formed inside the box body.

I am using this as a backroad horn speaker box.

``Problem to be Solved by the InventionJ'' However, such a wooden speaker box requires cutting a large number of boards into predetermined dimensions and assembling them with precision mostly by hand, which naturally requires a lot of effort in designing and manufacturing. Not only is this difficult and unsuitable for mass production, but the entire box itself is made of wood and is lightweight, which causes resonance with the imaging produced by the speaker unit, causing the box to become distorted, resulting in a major problem that significantly degrades sound quality. .

In addition, although it is ideal that the sound path for a backload horn should be a long curved shape with complicated bends, it is difficult to create a sound path that is complicated by simply combining rectangular plates. It is virtually impossible to form a curved sound path, so the advantages of a backloaded horn cannot be fully utilized, and even if carefully assembled, the sound path has a sealed structure. is very difficult to obtain,
Due to this, there is also the problem of sound leakage.

Therefore, in recent years, the material for this kind of speaker box is heavy, has no resonance, and compared to wood,
Concrete materials with high sound radiation efficiency are attracting attention, but when attempting to integrally mold a speaker box with this concrete material, it becomes difficult to form a complicatedly curved sound path inside the concrete box body. However, this is more difficult than in the case of wooden boxes, so even though it is well known that concrete is an excellent molding material, it has not yet been put into practical use.

For this reason, in this field, the emergence of a concrete-layer backload horn speaker box is highly anticipated.

``Means for Solving the Problems'' The present invention was developed in response to such demands, and is based on the premise of a speaker box for a backroad horn that has a sound path that bends inside the main body. , a hollow molded body molded in the same shape as the bent shape of the sound path, the outer periphery of the hollow molded body is integrally surrounded by a concrete layer, and the hollow molded body is provided inside the concrete box body. We adopted a configuration that forms a defined sound path.

"Function" Therefore, in the present invention, if a hollow molded body exhibiting a desired bent shape is independently molded and the outer periphery of the hollow molded body is surrounded with a concrete layer of a predetermined thickness, the concrete layer At the same time, it is possible to automatically form a sound path with a desired curved shape defined by the hollow body inside the concrete body without any post-processing. Therefore, this reduces the backload and
For the first time, we are able to offer concrete speaker boxes for use in horn systems.

``Example'' Below, the present invention will be described in detail based on an example illustrating the present invention.As shown in FIG. By separately molding a hollow mold body 1 having the same shape as the bent shape of the desired sound path using an appropriate molding material such as paper clay, and organically combining the hollow mold body 1 and concrete material, The present invention is characterized by providing a concrete layer speaker box.

In addition, when molding this hollow mold body 1, it is most preferable to mold the whole body continuously into a thin wall shape, but the present invention is not limited to this. For example, the hollow mold body 1
molded into two parts on the left and right, and the left and right split mold bodies are later combined, or it is divided into a plurality of parts in the length direction, and each of the divided mold bodies is later joined together. Depending on the implementation, it is also optional to configure the hollow mold body 1 by combining them into a state. However, if it is combined later,
Needless to say, it is necessary to ensure that the joint is sealed. Furthermore, the cross-sectional shape of the hollow body 1 and its upper and lower openings is not limited to the rectangular shape shown in the figure.
It is also optional to make the speaker box into a round shape or other shape depending on the implementation9.And when actually manufacturing the speaker box,
First, as shown in FIG. 2A-B, the hollow mold body 1 molded into the desired bent shape is set in a rectangular mold frame 2, and then the hollow mold body A necessary amount of concrete material 3' is poured into a state surrounding the outer periphery except for the opening of 1, and the concrete material 3' is hardened to form a double structure between the hollow mold body 1 and the concrete layer 3 of a predetermined thickness. By simply integrating the concrete layer box body 4 as shown in FIG. 3A-B, it is possible to easily manufacture the box body 4 made of concrete. Sound path 5 of desired bent shape defined by mold body 1
This makes it possible for the first time to provide a concrete speaker box for use in backloaded horn systems.

Therefore, the speaker box of this embodiment is extremely easy to manufacture, and has excellent mass production and is inexpensive compared to wooden ones.The concrete itself is also inexpensive, so from this point of view, the cost is also lower. This will contribute to lower prices.

Incidentally, during manufacturing, as shown in FIG.
Alternatively, although not specifically shown.

If other uneven shapes, grooves, etc. are applied, the hollow mold body 1
Since the concrete layer 3 can be more effectively integrated with the concrete layer 3, even if the sound path 5 is defined by the hollow body 1, the chattering phenomenon due to sound pressure can be suppressed.

Therefore, if you attach a speaker unit (not shown) to the upper opening 4a of the box body 4 and use it,
While actively taking advantage of the material advantages of concrete,
Among the sounds generated on the back side of the speaker unit, especially bass sounds are transmitted through the sound path 5 defined by the hollow body 1 existing inside the main body 4.
It becomes possible to effectively amplify the signal and reproduce it with a sense of volume from the lower opening 4b of the main body 4.

Therefore, in the speaker box of this embodiment, since all parts except the sound path 5 are made of concrete, the weight is extremely large compared to a wooden one, so the speaker box resonates with the vibrations produced by the speaker unit. There is no need to worry about boxing, and the deterioration in sound quality can be completely eliminated, and the sound path 5 formed inside the main body 4 can be ideally formed by simply giving the hollow body 1 a desired bent shape. Since it is possible to form a bent shape, the advantages of the 5-back road horn can be brought out from this point as well.

Furthermore, the double structure of the hollow body 1 and the concrete layer 3 ensures a sealed structure for the sound path 5, which also prevents sound leakage and ensures improved sound quality. Of course, by making the inner surface of the hollow mold body 1 a smooth surface.

It is also possible to effectively prevent diffused reflection of sound and improve the sound quality.

In addition, in this embodiment, it is not possible to mix foreign aggregates into the concrete layer 3, or to put felt or the like on the inner surface of the hollow molded body 1, or to coat it with paint or the like. Since the sound quality can also be changed, it also has the advantage of making it possible to freely obtain the sound quality of your choice.

"Effects of the Invention" As described above, the speaker box of the present invention includes a hollow body molded in the same shape as the bent shape of the sound path, and integrally surrounds the outer periphery of the hollow body with a concrete layer. The concrete box body is characterized in that a sound path defined by a hollow body is formed inside the concrete box body.
At the same time, we can manufacture the box body with a concrete layer.
Since it is possible to automatically form a sound path with a desired curved shape inside the concrete main body without any post-processing, this makes it possible to create concrete speakers for backload horn systems. This is the first time we can offer a box.

Moreover, in the present invention, by using a hollow molded body, it goes without saying that it is possible to freely form a sound path of any shape, but it is also possible to easily manufacture the same thing with precision. Therefore, compared to wooden speaker boxes, it is superior in mass production and can greatly contribute to lower costs.

In addition, forming the sound path with a hollow body takes advantage of the material advantages of concrete.

The hollow body effectively suppresses the diffused reflection of sound, thereby further improving the sound quality, and it is also possible to freely change the sound quality by selecting the molding material for the hollow body.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing an example of a hollow mold body used in a speaker box according to an embodiment of the present invention, and FIGS. 2 A-B are steps for manufacturing a concrete speaker box using the hollow mold body. FIG. 3A is an overall perspective view showing the present concrete speaker box, and FIG. 3B is a longitudinal sectional view of the same. 1...Hollow body, 3...Concrete layer, 4...
Speaker box body, 5... sound path.

Claims (1)

[Claims] (1) Back road with a sound path that bends inside the main body.
The speaker box for a horn includes a hollow molded body formed in the same shape as the bent shape of the sound path, the outer periphery of the hollow molded body is integrally surrounded by a concrete layer, and the inside of the concrete box body is A speaker box for a backroad horn, characterized in that it is configured to form a sound path defined by the hollow body.