JP2899987B2 - Backload horn speaker box - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a speaker box for a back load horn having a sound path which is complicatedly bent inside a main body.

"Conventional technology" Among audiophiles, even a small speaker unit directly radiates high-temperature and medium-frequency sounds from the front of the speaker unit, and reproduces low-frequency sounds coming backwards in an orthodox manner through a long sound path. The backload horn system has been attracting much attention because of its advantages such as improved volume.

For this reason, various attempts have been made to develop a speaker box used for such a back-load horn system. However, the speaker box has a complicated and bent long sound path for amplifying bass inside. Since the sound path must be formed, various restrictions are imposed on the design and manufacture of the sound path.

Therefore, at present it is published by
As described in "stereo (June 1989)" and the like,
While cutting a wooden plate material such as Rawan plywood or plywood plywood to a predetermined size and appropriately assembling the plate material of each size using nails or adhesives, while forming a box-shaped box body,
Form a sound path for bass amplification inside the box body,
This is used as a speaker box for the backload horn.

[Problems to be Solved by the Invention] However, such a wooden speaker box is required to cut a large number of plate members into predetermined dimensions and to assemble them by hand with high precision, so that the design and manufacture of the wooden speaker boxes are extremely difficult. Not only is it unsuitable for mass production, but also because the entire box body is made of wood and lightweight, it resonates with the vibration generated by the speaker unit to cause a box, which has a serious problem of significantly lowering the sound quality.

Also, the sound path for the backload horn is originally
In spite of the fact that it is ideal to have a complicated curved long curved shape, it is virtually impossible to form a complicated curved sound path by simply combining rectangular plates. Because of this, it is not possible to make full use of the advantages of the back load horn, and even if it is carefully assembled, it is very difficult to obtain a closed structure of the sound path, so due to this, sound leakage It also has problems that arise.

Therefore, in recent years, as a material for this type of speaker box, a concrete material having high weight and non-resonance and having a high sound radiation efficiency as compared with wood has attracted attention. If it is to be integrally molded, it is more difficult to form a sound path that bends intricately inside the concrete box main body than in the case of a wooden box. Even though they know enough, they have not yet been put to practical use.

For this reason, the appearance of a speaker box for a back load horn made of concrete has been greatly aspired in the art.

[Means for Solving the Problems] Accordingly, the present invention has been developed to meet such a demand, and is based on the premise of a speaker box for a backload horn having a sound path bent inside a main body. A hollow mold body continuously and integrally molded so as to have the same shape as the bent shape of the sound path, the outer periphery of the hollow mold body is integrally surrounded by a concrete layer, and the concrete box body is A configuration in which a sound path directly defined by the hollow body is formed is adopted.

According to the "action", in the present invention, a hollow mold having a desired bent shape is independently formed, and the outer periphery of the hollow mold is surrounded by a concrete layer having a predetermined thickness. And a sound path of a desired bent shape defined by a hollow mold body can be automatically formed inside the concrete body without any post-processing or the like. Therefore, it is possible to provide, for the first time, a concrete speaker box used in the backload horn system.

In addition, forming the hollow mold continuously and integrally so as to have the same shape as the sound path eliminates the necessity of molding the hollow mold using a large number of materials, so that the sealing property is high and complicated. A hollow mold having a bent shape can be obtained very easily.

"Example" Hereinafter, the present invention will be described in detail with reference to one embodiment. As shown in Fig. 1, the speaker box for a back load horn according to the present embodiment includes various synthetic resins and glass fibers. Using an appropriate molding material such as paper clay, the hollow mold 1 having the same shape as the bent shape of the desired sound path is independently formed in advance, and the hollow mold 1 and a concrete material are organically combined. A speaker box made of concrete is provided.

In molding the hollow mold 1, it is most preferable that the whole is integrally and continuously formed into a thin wall. However, the present invention is not limited to this. And the left and right divided mold bodies are combined later, or divided into a plurality of pieces in the length direction, and the divided mold bodies are continuously connected to each other later. Combining to form the hollow body 1 is also optional depending on the implementation. However, it goes without saying that in the case of merging later, the hermetically sealed state of the joint is ensured. Further, the cross-sectional shape of the hollow mold body 1 and the upper and lower openings thereof is not limited to the illustrated square shape, but may be a round shape or the like according to the embodiment.

Then, when actually manufacturing the speaker box, first, as shown in FIGS. 2A and 2B, the hollow mold body 1 formed into the desired bent shape is set in a rectangular mold frame 2. A required amount of concrete material 3 ′ is poured into the mold 2 so as to surround the outer periphery of the hollow mold 1 except for the opening, and the concrete material 3 ′ is hardened. Only by integrating the concrete layer 3 having a predetermined thickness with a double structure, as shown in FIGS. 3A and 3B, the concrete box body 4 can be easily manufactured, and at the same time, any post-processing is performed. Without this, it is possible to automatically form the desired curved sound path 5 defined by the hollow mold body 1 inside the concrete body 4, so that the back load horn system can be formed. Concrete speaker speaker used So that the first time it is possible to provide a box.

Therefore, since the speaker box of the present embodiment is extremely simple to manufacture, compared to a wooden speaker box, it is better to mass-produce and the cost is lower, and the concrete itself is also cheaper. This can contribute to cost reduction.

At the time of manufacture, as shown in FIG.
A large number of protrusions 6 exhibiting an anchoring effect are formed on the outer peripheral surface of the hollow mold body 1 and the concrete layer 3 if other irregular shapes or grooves are provided. Since the integration can be achieved more effectively, even if the sound path 5 is defined by the hollow body 1, the chatter phenomenon due to the sound pressure can be suppressed.

Therefore, after that, if a speaker unit (not shown) is attached to the upper opening 4a of the box body 4 and used,
While actively utilizing the material advantages of concrete,
Among the sounds generated on the back side of the speaker unit, particularly, a low sound is generated by a sound path 5 defined by the hollow body 1 existing inside the main body 4.
Thus, it is possible to effectively amplify and reproduce with a sense of volume from the lower opening 4b of the main body 4.

Therefore, in the speaker box of the present embodiment, all parts except the sound path 5 are made of concrete, so that the weight becomes extremely large as compared with a wooden one, so that the speaker box resonates with the vibration produced by the speaker unit, There is no need to worry about causing a box, and the deterioration of sound quality can be completely eliminated. In addition, the sound path 5 formed inside the main body 4 is an ideal one only by giving the hollow body 1 a desired bent shape. Since it becomes possible to form a bent shape, the advantage of the back load horn can be drawn out from this point as well.

Moreover, the closed structure of the sound source 5 is ensured by the double structure of the hollow mold 1 and the concrete layer 3,
From this point, it is of course possible to prevent sound leakage and to guarantee the improvement of sound quality. However, by making the inner surface of the hollow body 1 smooth, it is possible to effectively prevent diffused reflection of sound. Sound quality can be further improved.

Further, in the present embodiment, a foreign aggregate is mixed in the concrete layer 3, a felt or the like is stretched on the inner surface of the hollow mold 1, or a coating material or the like is coated. Thus, since the sound quality can be changed, there is also an advantage that a desired sound quality can be freely obtained.

As described above, the speaker box of the present invention includes a hollow mold formed in the same shape as the bent shape of the sound path, and the outer periphery of the hollow mold is integrally surrounded by a concrete layer, Since the sound path defined by the hollow mold is formed inside the concrete box main body, the concrete box main body can be manufactured, and at the same time, any post-processing is performed. Without this, a sound path having a desired bent shape can be automatically formed inside the concrete body, whereby a concrete speaker box for a backload horn system can be provided for the first time. Was.

In addition, according to the present invention, it is needless to say that the use of the hollow mold body allows any sound path of any shape to be freely formed. As a result, compared to a wooden speaker box, it is excellent in mass productivity and can greatly contribute to cost reduction.

In addition, forming the sound path with a hollow-type body can effectively suppress the irregular reflection of sound by the hollow-type body while positively utilizing the material advantages of concrete, thereby further improving the sound quality. At the same time, the sound quality can be freely changed by selecting the molding material of the hollow mold body.

Also, forming the hollow mold continuously and integrally so as to have the same shape as the bent shape of the sound path eliminates the necessity of molding the hollow mold using a large number of materials, so that the sealing property is high. In addition, a hollow mold having a complicated bent shape can be obtained very easily.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an example of a hollow mold provided in a speaker box according to an embodiment of the present invention, and FIGS. 2A and 2B are steps of manufacturing a concrete speaker box using the hollow mold. 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)

(57) [Claims] 1. A speaker box for a backload horn having a sound path bent inside a main body, comprising: a hollow mold body continuously and integrally formed so as to have the same shape as the bent shape of the sound path. Wherein the outer periphery of the hollow mold is integrally surrounded by a concrete layer, and a sound path directly defined by the hollow mold is formed inside the concrete box body. Speaker box for backload horn.