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JPS54159215

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DESCRIPTION JPS54159215
Description 1, title of the invention
スピーカボックス
3. Detailed Description of the Invention The present invention relates to a speaker box provided
with a box body formed by cutting a hollow cylinder whose both ends are closed in the cylinder
direction. A speaker box generally used at present is formed into a rectangular parallelepiped
shape by combining and bonding a plurality of flat plates with an adhesive or the like, but
considering the occurrence of standing waves in the inside, etc., the shape is not The structure is
complicated, for example, to form an equilateral solid shape, and the manufacturing cost can not
but be increased significantly. Still as shown in FIG. 1, the speaker cabinet 3 in the two-way
speaker system provided with the speaker unit 1 for the low frequency range and the speaker
unit 2 for the middle and high frequency range is in the box 3 from each speaker unit 2 Sub-box
3b called a so-called back chamber in the main box 3a in order to ensure that the sound outputs
radiated to each other do not interfere with each other and to form a speaker box of a suitable
volume for the speaker unit 2 for middle and high frequency range To arrange. The structure of
the main box 3a and the sub box 3b must be complicated in consideration of preventing the
above-mentioned occurrence of the actual wave. Therefore, the present invention is intended to
provide a speaker box with a novel configuration in which standing waves are not easily
generated, and EndPage: 1 is also simple in structure and can be manufactured at low cost.
Hereinafter, the present invention will be described in detail according to the drawings showing
one embodiment. FIG. 2 is a partially broken perspective view of an embodiment in which the
present invention is applied to a speaker box for a two-way speaker system. In the embodiment
shown in FIG. 2, reference numeral 11 denotes a speaker mounting plate as a so-called front
panfull plate, and the low-pitched speaker unit 12 and the mid-high-pitched speaker unit 13 are
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fitted and attached to the speaker mounting plate 11 thereof. Each opening 14 and 15 is
provided. Further, 16 is a main box main body. The main box main body 16 is formed in a
rectangular parallelepiped shape by a general means in which flat plates 17 are combined and
joined. And 1B is a sub-box main body which forms a so-called back chamber in the abovementioned main box. As shown in FIGS. 3A to 3C, the sub-box main body 18 suitably has a
hollow cylindrical body 21 closed by valley side plates 19 and 20 to which both end portions
21A and 21B are adhered and fixed respectively in a partial direction. It is cut off at an incline.
That is, FIG. 3N shows an external perspective view of the hollow cylindrical body 21. The hollow
cylindrical body 21 is obtained by cutting a pipe of paper, vinyl chloride plastic, metal or the like
into an appropriate length. Become.
3B shows a state in which both end portions 21A and 21B of the hollow cylindrical body 21 are
closed by the side plates 19 and 20, and the side plates 19 and 20 are concaves into which the
both end portions 21A and 21B are fitted. The strips 19a and 20a are engraved, and both end
portions 21A and 21B of the hollow cylindrical body 21 are fitted to the above-mentioned
recessed strips 19a and 20a and fixed by adhesive. Then, the hollow cylindrical body 21 whose
both end portions 21A and 21B are closed by the side plates 19 and 20 is cut with an
appropriate inclination in the partial direction (the cut surface 22 is shown by a dashed dotted
line in FIG. 3B). 3), two sub-box bodies 18 of the shape as shown in FIG. 3C are formed at one
time. 3- Then, the sub-box main body 18 shaped as shown in FIG. 3C is shown in FIG. 4 by
adhesively fixing the contact cross section 22 to the speaker mounting plate 11 so as to surround
the opening 15. It's like nok. It forms a chamber. Therefore, in the embodiment as described
above, the bank chamber formed by the speaker mounting plate 11 and the sub-box main body
18 has a hollow irregular side solid shape such as a substantially truncated cone divided into
two, and further, each side plate Since 19 and 20 have an inclination with respect to the
radiation axis of the sound output from the speaker unit 13, generation of a standing wave in the
inside is extremely small. Further, since the hollow cylindrical body 21 is used in a pipe shape
such as paper as described above, it can be obtained at a very low cost, and it is cut in the
direction of its part to be divided into two and the sub-box main body 18 Since it is formed, the
back chamber can be formed easily at low cost. In the above embodiment, the sub-box main body
4-18 is formed by cutting the hollow cylindrical body 21 with an appropriate inclination to the
partial direction, but the hollow cylindrical body 21 is cut in the partial direction. Even if the
hollow semi-cylindrical shape is used as the sub-box main body 18 and the cut surface 22 is
adhered and fixed so as to surround the opening portion 15 of the speaker mounting plate 11,
generation of standing waves in the back chamber Can be sufficiently prevented. That is, as
shown in FIG. 5, even when the back chamber is formed by the sub box main body 18, the
speaker unit 13 serving as a sound source is not usually a point sound source, so the inner wall
18a of the sub box main body 18 The distance to the end is not even, and the occurrence of
standing waves can be sufficiently prevented. Further, although the sub-box main body molded
from the hollow cylindrical body is used in each of the above-described embodiments, it goes
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without saying that a hollow polygonal cylindrical body such as a square isotropy or a square
angular cylinder may be used.
Furthermore, although the present invention is applied to the sub-box forming the EndPage: 2
back chamber in the speaker box for the two-way speaker system in the above-described
embodiment, the present invention may be applied to form the main box. As well as being able to
prevent the occurrence of standing waves in the box, manufacturing is easy and cost can be
reduced. Thus, according to the present invention, it has a box main body formed by partially
cutting a hollow cylindrical body whose both ends are closed, and a speaker mounting plate
having an opening for mounting a speaker unit. Since the speaker box is formed by bonding and
fixing the cut surface of the box main body so as to surround the opening of the speaker unit
mounting plate, generation of standing waves in the box is extremely reduced, and manufacture
is easy. Provide a low cost speaker box. Therefore, the intended purpose can be achieved
sufficiently.
4. Brief Description of the Drawings FIG. 1 is a partially cutaway perspective view showing a
conventional example of a speaker box for a two-way speaker system. FIG. 2 is a partially
cutaway perspective view of an embodiment of the present invention. FIGS. 3A to 3C are external
perspective views of the hollow cylinder, the hollow cylinder closed at both ends, and the sub-box
main body used in the above embodiment. FIG. 4 is an enlarged cross-sectional view showing a
main part in the above embodiment in an enlarged manner. FIG. 5 is an enlarged longitudinal
sectional view showing an essential part of another embodiment of the present invention in an
enlarged manner. 11 ............... speaker mounting plate 12, 13 ...... speaker unit 14, 15 ...... speaker
unit opening for attaching portions 16, 18, ----- speaker box body 19, 20 ...... side plate 21 ...............
hollow cylinder 21A, 21B · · · hollow cylinder opposite ends 22
··················································································· · [EndPage: 3 Figure 3 / A) No f. FIG. 4 2 () a ,; 5 FIG.
0 EndPage: 4
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