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DESCRIPTION JP2000278778

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DESCRIPTION JP2000278778
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
Kelton-type speaker suitable for use in, for example, a subwoofer of a television receiver.
Specifically, by forming the duct so as to project from the second air chamber and arranging to
penetrate the first air chamber, the duct can be made thicker to reduce the generation of wind
noise, and The present invention relates to a Kelton-type speaker in which the number of parts is
reduced to reduce the time for assembly.
[0002]
2. Description of the Related Art A conventional television receiver has a heat exhaust port in a
cabinet, so that a sufficient bass can not be obtained. Therefore, there has been proposed a
television receiver capable of reproducing deep bass regardless of the shape of the cabinet by
incorporating a subwoofer in the cabinet. For example, a Kelton-type speaker is used as the
subwoofer.
[0003]
FIG. 2 is a cross-sectional view of an essential part showing an example of a conventional Keltontype speaker. The Kelton-type speaker 200 seals the rear surface of the speaker unit 201 with a
first air chamber 202, provides a second air chamber 203 on the front surface of the speaker
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unit 201, and is generated in the second air chamber 203. The sound wave is radiated to the
outside through the duct 204 and a port (opening) 205 connected to the duct 204.
[0004]
The Kelton-type speaker 200 includes a first member 211 which constitutes a partition plate
which divides the first air chamber 202 and the second air chamber 203 and a second member
212 which constitutes the first air chamber 202. And a third member 213 that constitutes the
second air chamber 203, a part of the duct 204 and the port 205, and a fourth member 214 that
constitutes the part of the duct 204, and the first member 211 The speaker unit 201 is attached
and comprised. The first to third members 211 to 213 are integrated using a screw 215.
[0005]
The fourth member 214 is integrated by being pressed into the duct portion of the third member
213. The end 204 e of the duct 204 formed by the fourth member 214 is rounded. This is to
prevent the generation of wind noise. As described above, in order to form the end 204 e of the
duct 204 into a rounded shape, the portion of the duct 204 is formed separately into the third
member 213 and the fourth member 214 from the viewpoint of molding by a mold. ing.
[0006]
Here, the Kelton-type speaker will be described in more detail.
[0007]
The Kelton-type speaker is a bass reproduction speaker having a band-pass filter characteristic
that has been used for many years.
FIG. 3 shows the basic structure of this Kelton-type speaker. That is, the back of the speaker unit
301 is sealed by the first air chamber 302. In addition, a second air chamber 303 is provided on
the front of the speaker unit 301. Then, a sound wave (air vibration) generated in the second air
chamber 303 is radiated to the outside through the duct 304 and a port (opening) 305
connected to the duct 304.
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[0008]
Thus, the output sound pressure frequency characteristics of the sound wave radiated from the
port 305 become band-pass filter characteristics as shown in FIG. Such band-pass filter
characteristics are obtained because the Kelton-type speaker has three resonance frequencies of
fL, fB, and fH.
[0009]
fL is mainly at the series resonance frequency of the elasticity exhibited by the air in the first air
chamber 302, the effective mass of the diaphragm of the speaker unit 301 and the elasticity of
the diaphragm support, and the equivalent mass of air in the duct 304. is there. This fL gives the
lower limit of the frequency band. Further, fH mainly represents the elasticity of the air in the
first air chamber 302, the effective mass of the diaphragm of the speaker unit 301 and the
elasticity of the diaphragm support, and the air of the second air chamber 303. It is a series
resonance frequency of elasticity. This fH gives the upper limit of the frequency band. Further, fB
is the parallel resonance frequency of the elasticity exhibited by the air in the first air chamber
302 and the equivalent mass of the air in the duct 304, which is the resonance frequency of the
acoustic resonator.
[0010]
In the Kelton-type speaker 200 shown in FIG. 2, the duct 204 is disposed in the second air
chamber 203. Therefore, the length of the duct 204 can not be so long because it is restricted by
the size of the second air chamber 203, and therefore the duct 204 can not be so thick, which is
disadvantageous with respect to the generation of wind noise. . In addition to the first to third
members 211 to 213, a fourth member 214 is also required to add R to the end 204 e of the
duct 204 to suppress the generation of wind noise. As the number of parts increased, it took
much time for assembly.
[0011]
Therefore, in the present invention, it is an object of the present invention to provide a Keltontype speaker capable of thickening a duct to reduce the generation of wind noise and reducing
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the number of parts to reduce the labor of assembly.
[0012]
SUMMARY OF THE INVENTION In the present invention, the back of the speaker unit is sealed
by a first air chamber, and a second air chamber is provided on the front of the speaker unit, and
sound waves generated in the second air chamber. In the Kelton-type speaker configured to
radiate to the outside through the duct and the port connected to the duct, the duct is formed to
project from the second air chamber and penetrates the first air chamber It is arranged as
follows.
[0013]
In the present invention, the duct is formed to project from the second air chamber, and is
disposed to penetrate the first air chamber.
Therefore, the duct can be made longer and the duct can be made thicker accordingly by
comparison with the conventional case where the duct is formed in the second air chamber.
This makes it possible to reduce the occurrence of wind noise.
[0014]
Further, the duct is formed to project from the second air chamber, and is disposed to penetrate
the first air chamber. Therefore, in order to prevent the generation of wind noise, it is necessary
to attach R to the second air chamber side end of the duct, but this is divided into the first and
second air chambers, and the duct connection of the cut-off plate It can cope by attaching R to
the part.
[0015]
Therefore, the Kelton-type speaker according to the present invention includes, for example, a
first member that constitutes a part of a partition plate and a duct that divides the first and
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second air chambers, a first air chamber, a part of the duct, and a port And a third member
constituting the second air chamber, and the speaker unit is attached to the first member. As a
result, the number of parts can be reduced and assembly time can also be reduced as compared
with the prior art.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential
part of a Kelton-type speaker 100 as an embodiment.
[0017]
The Kelton-type speaker 100 seals the rear surface of the speaker unit 101 with the first air
chamber 102, provides the second air chamber 103 on the front surface of the speaker unit 101,
and is generated in the second air chamber 103. Sound waves are radiated to the outside
through the duct 104 and a port (opening) 105 connected to the duct 104. In this case, the duct
104 is formed to project from the second air chamber 103 and is disposed to penetrate the first
air chamber 102.
[0018]
In addition, the Kelton-type speaker 100 includes a first member 111 which constitutes a part of
a partition plate and a duct 104 which divides the first air chamber 102 and the second air
chamber 103, a first air chamber 102, and a duct. A speaker unit 101 attached to the first
member 111, and a second member 112 constituting a part of the port 104 and the port 105,
and a third member 113 constituting the second air chamber 103; ing.
[0019]
The first to third members 111 to 113 are integrated using a screw 114.
In this case, tip portions of the duct portion 111d of the first member 111 and the duct portion
112d of the second member 112 are fitted, and the duct portion 111d and 112d constitute a
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duct 104. Further, in order to prevent the generation of wind noise, an end portion 104e of the
duct 104 on the second air chamber 103 side is rounded. This is dealt with by rounding the duct
connection portion of the first member 111.
[0020]
As described above, in the present embodiment, the duct 104 is formed to project from the
second air chamber 103 and is disposed to penetrate the first air chamber 102. Therefore, as
compared with the case where the duct 204 is formed in the second air chamber 203 as in the
conventional example shown in FIG. 2, the duct 104 can be made longer, and the duct 104 can
be made thicker accordingly. Thereby, the generation of wind noise can be reduced compared to
the conventional example.
[0021]
Also, in order to prevent the generation of wind noise, it is necessary to attach R to the end of the
duct 104 on the second air chamber 103 side, but this is used as a partition plate for partitioning
the first and second air chambers. It copes by attaching R to the duct connection part. That is, in
this embodiment, the first to third members 111 to 113 are provided, and the speaker unit 101
is attached to the first member 111. Therefore, compared with the conventional example shown
in FIG. 2, the number of parts can be reduced, and the time and effort for assembly can be
reduced.
[0022]
According to the present invention, the duct for radiating the sound wave generated in the
second air chamber to the outside is formed to project from the second air chamber, and the first
air chamber is formed. It is disposed to penetrate. Therefore, since the duct can be made longer
as compared with the prior art, it is possible to make the duct thicker accordingly to reduce the
generation of wind noise. In addition, the number of parts can be reduced to reduce the labor of
assembly.
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