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DESCRIPTION JPH0638288

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DESCRIPTION JPH0638288
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, and in particular to improve the bass reproduction capability by improving the
structure of the speaker unit.
[0002]
2. Description of the Related Art In recent years, there has been an increasing demand for
downsizing of a cabinet also for a speaker system. However, when the cabinet is downsized, bass
reproduction becomes difficult and narrow band sound quality is obtained.
[0003]
Therefore, there is a so-called bass reflex type speaker system in which the air in the cabinet is
resonated by the resonance port to enhance the bass range.
[0004]
As shown in FIG. 3, it comprises a speaker unit 1, a cabinet 2 for shielding acoustic energy
radiated from the back surface of the speaker unit 1, and a resonance port 3.
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Also, as shown in FIG. 4, the acoustical equivalent drone cone 4 may be provided instead of the
resonance port.
[0005]
In such a configuration, as shown in FIGS. 3 to 6, the resonance port 3 or the drone cone 4 is
disposed on the baffle plate 5 or the back plate 6. However, when the resonance port 3 or the
drone cone 4 is disposed on the baffle plate 5, if the port aperture area of the resonance port 3
or the area of the drone cone 4 is large, the baffle plate 5 inevitably becomes large, and the
cabinet Miniaturization of 2 is difficult. Also, when the resonance port 3 or the drone cone 4 is
disposed on the back plate 6, there is a problem that the sound quality changes when the cabinet
2 is brought close to the wall surface of the room or the like.
[0006]
In order to solve such problems, for example, a speaker disclosed in Japanese Patent Publication
No. 3-78839 (H04R9 / 06) is known. The outline of the structure is shown in FIG. This divides
the circular diaphragm 7 into two concentrically, which are supported by the edge 8 and the
edge 9, with the inner diaphragm 7 a of the circular diaphragm 7 as the main diaphragm and the
outer diaphragm of the circular diaphragm 7. 7b is used as drone corn.
[0007]
This speaker has the following disadvantages. First, the structure is complicated and difficult to
assemble. Then, when a large input is applied, the inner diaphragm 7a shakes to cause a so-called
rolling phenomenon. Furthermore, if the control of the resonance frequency between the inner
diaphragm 7a and the outer diaphragm 7b is not strictly performed, a large peak or dip occurs
on the characteristics.
[0008]
On the other hand, as shown in FIG. 8, there is also a structure in which the through hole 11 is
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provided in the center pole portion 10 of the magnetic circuit of the speaker and the resonance
port 12 is provided on the opposite side to the diaphragm side. This case has the following
disadvantages. That is, if the air permeability of the dust cap 14 adhered to the central portion of
the cone 13 is not significantly increased, the passage of air is blocked and the characteristics
change. Then, since the voice coil bobbin 15 also acts as a part of the resonance port, the
amplitude of the voice coil bobbin 15 changes depending on the magnitude of the input signal or
the frequency of the input signal. As a result, the total length of the port changes, the resonance
frequency also changes, and the characteristics are not stable.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention provides a speaker system comprising a speaker unit having a resonance port formed
through a center pole. It is.
[0010]
Since the above-mentioned construction is made, the resonance port formed through the center
pole improves the bass reproduction capability.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to the drawings.
[0012]
FIG. 1 shows the structure of a speaker unit used in the speaker system of the present invention.
In the figure, 16 is a cone, 17 is an edge supporting the cone 16, 18 is a voice coil bobbin, 19 is a
first damper, 20 is a second damper, 21 is a center pole, 22 is connected to the center pole 21
Resonant ports 23 are through holes provided in the center pole 21.
[0013]
The present invention is characterized in that a nonmagnetic resonance port 22 having the same
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diameter as the through hole 23 provided in the center pole 21 is fixed to the cone 16 side.
The nonmagnetic material is used to reduce the leakage of the magnetic flux in the magnetic gap,
and the fixing method of the resonance port can be applied in various forms such as forming an
adhesive or a thread and screwing.
[0014]
Also, a second damper bonding glue 24 is provided in a part of the resonance port 22, and the
second damper bonding glue 24 and the cone 16 are bonded via the second damper 20.
Although the second damper 20 and the first damper 19 have concentric corrugations, it is
desirable that the material has no air permeability.
[0015]
FIG. 2 shows a speaker system to which the speaker unit shown in FIG. 1 is attached. In the
figure, reference numeral 25 is a cabinet. By attaching the speaker unit as described above to the
cabinet 25, a bass reflex type speaker system is configured.
[0016]
In general, in the case of a bass reflex type speaker system, it is possible to change the resonance
frequency by adjusting the cross-sectional area or length of the resonance port, assuming that
the minimum resonance frequency f0 of the speaker and the cabinet volume are constant. In the
case of the present invention, adjustment is made by the length.
[0017]
As described above, according to the present invention as described in detail, the speaker system
is provided with the speaker unit having the resonance port formed through the center pole.
There is no need to provide a port, space is saved, and the bass reproduction capability is
improved.
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