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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a conventional back load
horn speaker cabinet with a side plate removed, and FIG. 2 is a side view showing a back load
horn speaker cabinet according to an embodiment of the present invention with the side plate
removed. 3 and 4 are graphs showing the horn opening radiation characteristics of the prior art
and the invention, respectively, and FIGS. 5 and 6 show the direct emission characteristics of the
prior art and the invention, respectively. It is a graph. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
opening portion 5, 6 · · · · · · · · · partition plate. Fig. 1 Fig. 2-81-real opening 52-20828 (2) Fig. 382-real opening 52-20 828 (3) information 83 1
[Detailed description of the invention] C G, 5 this invention is a pack road horn speaker key ˜ 'Ya,
Ot. つ&え、6.。 The purpose is to improve 1 and 1 and □. The m1 figure shows the
conventional vanok road horn speaker cavitation. Reference numeral l denotes a cabinet main
body, which is provided with partition plates 2a to 2d for a 4 <sound generated from the back of
the speaker 3. Partition plate 2 (alpha) -2d is comprised with a flat plate, and in order to make
the space formed among them into a horn shape, it is arrange ¦ positioned by predetermined ¦
prescribed inclination angle concealment. By the way, since each of the partition plates 2a to 2d
in the above-mentioned conventional apparatus is entirely formed of a flat plate, a corner is
generated at the joint of the two and a vortex is generated at the corner portion. It also adversely
affects the sound quality. In particular, the partition plates 2c and 2d forming the opening 4 and
the bottom plate l 'of the cabinet main body 1 are flat plates so that they are easily reflected and
adversely affect the sound quality. The present invention solves the above problems, and FIG. 2
shows an embodiment thereof. The cabinet body 1 is provided with partitions 2α and 2b like the
conventional one and is formed as a back load ho / ho, but the partition 5.6 forming the opening
4 is bent to a curved surface Made of plywood. Although various means can be considered as +
steps to obtain the curved surfaces of the partition plates 5 and 6, it is possible to use wood that
is << suitable for resonance <<, processing is easy, plate thickness UI4 is easy, and cost
performance is good. Is appropriate. This lumber is made into a single plate and mutually
smashed to form a curved surface molded plywood of a predetermined shape, and the part of the
partition plate is processed into one piece by the above-described molded plywood, the lapping is
superior to wood as a vibration (2) absorber In addition to the above properties, there is also an
improvement in strength due to bending and molding, and since it is a one-piece curved surface,
the flow of air is straightforward and there is no air leakage, and the sound quality is not
adversely affected. Therefore, the sound emitted from the back surface of the speaker 3 is bent in
the direction − by the curved surface formed on the back surface of the partition plate 5 and is
emitted from the opening 4 formed between the oil surfaces of the partition plate 5 and the
partition plate 6 Therefore, the corners are smaller than those of conventional ones, and there is
a reduction in the I 'vortices generated there, and it is guided along the smooth curved surface to
prevent reflection at the opening 4 be able to. FIG. 3 shows the horn opening radiation
characteristics of the conventional back load horn speaker, and FIG. 4 shows the base J
characteristics of the present invention. As is clear from the intrinsic, the one that has
implemented the present invention has a smooth curve, and the sound quality is improved.
FIG. 5 shows the direct radiation characteristics of the prior art, and (3) FIG. 6 shows the same
characteristics as those of the present invention. As is apparent from the two figures, the direct
radiation characteristic is also affected, and the one in which the present invention is
implemented has a gentle curve, and the sound quality is improved. It should be noted that if the
bending angle other than the opening 4 is also formed of a curved surface molded plywood, the
eddy current at that portion can be reduced, so the improvement of the sound quality can be
expected further. As there is no, at least the opening 4 should be formed of curved molded
plywood. As described above, since at least the horn opening is formed of curved molded
plywood as described above, the corners are reduced, the vortex is reduced and the seam is
reduced as compared with the combination of flat plates, so Sound quality can be improved as
leakage is reduced and reflections are also reduced.