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DESCRIPTION JPS58114593

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DESCRIPTION JPS58114593
[0001]
The present invention relates to a speaker device. A conventional speaker device is shown in FIG.
In the figure, A is a speaker device, 1 is a speaker box main body, 2 and 3.4.5 are mounting holes
for attaching a speaker unit, 6 is a port, 7 is a reinforcing material, 8 is a high sound speaker and
for medium sound It is a pack cavity for the speaker. However, since the resonance frequency of
the speaker device A is within the sound range of the bass speaker, the speaker device A
resonates when the vibration frequency of the bass speaker matches the resonance frequency of
the speaker device A. In this case, the upper portion of the box main body 1 Although the
amplitude due to resonance is small because it is reinforced by the reinforcing material 7 and the
pack cavity 8, the reinforcement is not made around the bass speaker mounting hole 5 of the
baffle plate 9, especially near the bottom plate 10 There is a problem that it resonates and this
deteriorates the frequency characteristics of the speaker system. FIG. 2 shows a deformed state
of the conventional speaker device A by computer simulation using the finite element method.
Here, the size of the speaker device A in which the simulation was performed is that the box body
1 is 1050 stomach mX 600 familiar × 350 zones, and each plate thickness of the box body 1 is
30 stops, and the pack cavity 8 is 15 fights. The reinforcing material 7 is 20 tnm. Also, with
regard to the material constant, Young's 1 ° ratio is 5. OX 10 dyn / CJ, Poisson's ratio 0.23,
density 0.65 y / σ 2. This mode is generated at resonance at a frequency of 105 ° 2 Hz, and it
can be seen that the baffle plate 9 near the center of the lower portion of the baffle plate 9 and
the bottom plate O of the baffle plate 9 are largely deformed. Accordingly, it is an object of the
present invention to provide a spill force device that can improve the frequency characteristics of
a loudspeaker system. One embodiment of the present invention will be described with reference
to FIG. 3 and FIG. That is, as shown in FIG. 3, this speaker device B fixes one end of the
reinforcing member 11 at the lowermost central position of the inner surface of the bubble plate
9, and the other end of the reinforcing member 11 in the vertical direction of the back plate 12.
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1
It is connected at the intersection of the center line and the reinforcing member 7. The other
configuration is the same as that of the conventional example, so the same reference numerals
are given to the same parts and the description will be omitted. FIG. 4 is a view showing a
deformed state of the speaker device B by computer simulation using the finite element method.
In this figure, the size, thickness and material constant of the speaker device B are exactly the
same as the conventional example of FIG. 2, and the newly added reinforcing member 11 has a
cross-sectional area of 30i and a second moment of area of 1.
OX 10 "pot. This mode is caused by resonance when one frequency is 545.1 Hz, which makes the
resonance frequency 5 times higher than the conventional 105.2 Hz to 545.1 Hz due to the
reinforcing member 11 I understand that. Further, in this mode, as in FIG. 2, deformation appears
in the central lower portion of the bubble plate 9 and the bottom plate 1 o closer to the baffle
plate 9, but the central portion or side plate of the bottom plate 10 is It can be seen that it is kept
much smaller than the 13 variants. As described above, the resonance frequency is increased by
the reinforcing member 11, and the amount of deformation can be reduced. As a result, the
frequency characteristic of the speaker system can be improved. In the above embodiment, the
other end of the reinforcing member 11 is connected to the crossing position between the
vertical center line of the back plate 12 and the reinforcing member 7, and the other end of the
reinforcing member 11 is the back plate 12. It can be fixed at any position on the vertical center
line. As described above, in the speaker device according to the present invention, between the
box main body and the lowermost central position of the inner surface of the baffle plate and an
arbitrary position on the vertical center line of the back plate in the box main body And an effect
that the frequency characteristic of the speaker system can be improved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially cutaway perspective view of the conventional speaker device, FIG. 2 is a view
showing a modified state of the conventional example by computer simulation using the finite
element method, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a view showing a
deformed state of this embodiment by computer simulation using the finite element method.
1 · · · Box body, 9 · · · baffle plate, 11 · · · · · · · · · · · · · · · · · · · · · speaker device (5) 639 1st @ Figure
2 Figure 5 Figure 4
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