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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device for converting an electrical signal such as an audio signal into a reproduced
sound. [Prior Art] FIG. 4 and FIG. 5 show, for example, a conventional so-called "Chivardo quarter
wave wave" speaker described in the magazine "Radio Technology" (March, 1987, pp. 176-181).
Figure 1 is a cross-sectional side view and a perspective view showing the device, in which 1 is a
tapered pipe-like speaker box, and the pipe path length! , And one end on the small diameter side
is the closed portion 1m, and one end on the large diameter side is the opening 1b. Reference
numeral 2 denotes a speaker, the center of which is disposed at a distance d from the closed side
1a of the speaker box 1 and attached to a mounting hole 1c provided in the speaker box 1. Next,
the operation will be described. By adding an audio signal to the speaker 2 from an external
amplifier (not shown), the audio signal is converted to a sound wave. In this case, the pipe path
length! , By making the wavelength of the fundamental wave of the required sound wave
approximately 1, the above-mentioned converted sound wave resonates in the speaker box 1,
thereby efficiently taking the sound wave of the fundamental wave as the reproduced sound. It
can be put out. Now, assuming that the fundamental wave is 40 Hz for bass, the pipe path length!
, Becomes approximately 2200 bales. The length d from the center of the speaker 2 to the closed
base end 1a of the speaker box 1 is approximately 97 (llIa). [Problems to be Solved by the
Invention] Since the conventional speaker apparatus is configured as described above, especially
in the case of a bass speaker, the full length of the speaker box 1, that is, the pipe path length!
There is a problem that 1 becomes as long as 2 m or more, which makes it difficult to install in
general homes and automobiles. The present invention was made to solve the above problems,
and the pipe length! The purpose of the present invention is to obtain a miniaturized speaker
device without shortening the length. [Means for Solving the Problems] In the speaker device
according to the present invention, a plurality of partition plates are provided in the speaker box,
and a pipe having a predetermined pipe path length is bent and formed by the partition plates. It
is a thing. [Operation] The speaker apparatus according to the present invention can shorten the
length of the speaker box to approximately the conventional length i by forming the pipe into, for
example, four folds. An embodiment of the present invention will now be described with
reference to the drawings. In FIG. 1, 3 is a speaker box having a length 1 as well, 4.5.6 is a
partition plate provided in the speaker box 3, 7h, 7b, .gamma.c, 7d is a speaker according to a
partition plate In the box 3, tapered pipes formed by being delayed with each other,
and 7 are pipes formed as one substantially bent tapered pipe by delaying the pipes 7a to 7d.
In this embodiment, the pipe 7 is a bend 7e. It shows the case of a four-fold pipe having a length
of 7 g, a length of 7 m and a length of pipe bent to about 180 °, respectively. A closing portion
rh is provided at one end of the small diameter portion of the pipe T, and an opening 71 is
provided at one end of the large diameter side of the pipe 7. Further, 71 ° and 7f are slopes
formed at the corner portions of the bent portions 7e and 7g. In FIG. 1 and FIG. 2, 2 is a speaker,
the frame part 2a is arranged in the space part 3m which arose in the vicinity of the said bending
part 7m of the speaker box 3, and the attachment hole 3b provided in the speaker box 3 It is
attached (Fig. 2). In FIG. 1, FIG. 2 and FIG. 3, 8 is an amplifier provided in the space section 3a, 9
# 'i volume adjustment knob provided in the amplifier 8, 10 is an input terminal of the amplifier
8, 11 is an amplifier The heat radiating portion 8 includes a plurality of heat radiating fins 11
and a breath. The heat radiating portion 11 is provided in the opening 71 of the pie goo, as
illustrated. Next, the operation will be described. When an audio signal is supplied to the input
terminal 10 of the amplifier 8, this audio signal is amplified by the amplifier 8 and applied to the
speaker 2 to be converted into an acoustic wave. This sound wave can be efficiently taken out by
resonating in a substantially single pipe T comprising pipes 7a to 7d which has a pipe channel
elongated hole of about 1 wavelength of the fundamental wave. At that time, the irregular
reflection of the sound wave can be prevented by the slopes 7j and 7 formed in the concave part
of the bending portions 7e and Tg by 71.7f, whereby the deterioration of the sound quality can
be eliminated. Also, the volume adjustment knob 9 can adjust the volume of the reproduced
sound. Further, the heat generated by the amplifier 8 can be released from the opening 71 by the
heat radiating portion 11. At that time, the cooling effect can be enhanced by the vibration of the
air by the sound waves in the pipe T. As in this embodiment, when the pipe 7 is bent at four
bending portions 7ep 7g and 7rn p, the speaker 2 is attached near the central bending portion
1m from the most desirable dimension in design to form a sufficiently large space portion 3a. can
do. Therefore, the large diameter speaker 2 can be mounted, and the amplifier 8 can be disposed
in the extra space. Therefore, the speaker 2 and the amplifier 8 can be disposed close to each
other, and the lead wire connecting the two can be made short to prevent the deterioration of the
sound quality. Furthermore, the heat radiation part 11 can be disposed at the opening 7i where
the air flow is good.
In the speaker apparatus according to this embodiment, for example, when the fundamental
wave is designed to have a low frequency of 40 Hz, the pipe path length J is a patent pipe γ
characterized by about 2.2 m. If so, the longitudinal dimension of the speaker box 3! , Can be
about 0.7 m. Therefore, the entire speaker device can be JSm, and can be sufficiently installed in
general homes and automobiles. As described above, according to the present invention, the pipe
for resonating the sound wave is bent, so that the speaker device can be miniaturized. In
particular, in the case where the pipe is folded in four, providing a speaker at the bent portion of
the pipe allows a large space for that portion, so a large diameter speaker can be used and an
amplifier is also provided. Thus, a compact speaker apparatus including an amplifier can be
realized. In addition, since the heat radiating portion of the amplifier can be provided inside the
opening of the pipe, it is not necessary to provide a protruding portion for the heat radiating
portion on the outside of the speaker box. The effects such as being able to prevent an accident
such as
Brief description of the drawings
1 is a front view showing a speaker device according to an embodiment of the present invention,
FIG. 2 is a side view of the device, FIG. 3 is a bottom view of the device, and FIG. 4 is a crosssectional side view showing a conventional speaker device FIG. 5 is a perspective view of the
same device.
2 is a speaker, 3 is a speaker box, 4.5 ° is a partition plate, 7 is a pipe, 7e, 7gt, 7mFi bent
portion. In the drawings, the same reference numerals indicate the same or corresponding parts.
Patent Assignee Mitsubishi Electric Corporation Attorney Attorney 1) Hirosawa Sawa (2 others)-3
or Pikapo 2) 7e, 7g, 7m Inflection point Fig. 2 liS Fig. 1h Fig. 4h
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description, jph04188999
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