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JP2008160363

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008160363
The present invention relates to a speaker, and it is an object of the present invention to reduce
the distortion of the speaker and to improve the driving efficiency. In order to achieve this object,
the present invention comprises a frame 5, a diaphragm 3 whose outer peripheral side is
supported by the frame 5, a voice coil body 2 connected to the diaphragm 3, and A magnetic
circuit 1 in which the voice coil 2b of the voice coil body 2 is movably disposed in the magnetic
gap 8, a magnetic gap 8 side portion from the connecting portion of the diaphragm 3 of the voice
coil body 2, a frame 5 The edge body 7 has a connection portion 7a having air permeability and
heat resistance, and an edge portion 7b formed of a ring-shaped flexible material connected to
the connection portion 7a. The speaker having the configuration in which the edge portion 7 b
protrudes upward and downward intermittently in the circumferential direction. [Selected figure]
Figure 1
スピーカ
[0001]
The present invention relates to a loudspeaker.
[0002]
In the conventional speaker, as shown in FIG. 7, the voice coil body 2A disposed movably in the
magnetic circuit 1A is connected to the inner peripheral end of the diaphragm 3A, and the outer
peripheral end of the diaphragm 3A is connected via the edge 4A. It is connected to the frame
5A, and further, the back surface of the diaphragm 3A is connected to the frame 5A via the
suspension holder 6A and the edge 7A.
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[0003]
In addition, distortion in the speaker is reduced by making the top and bottom amplitudes of the
diaphragm 3A vertically symmetrical with the protruding shapes of the edges 4A and 7A in the
opposite direction.
[0004]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP, 2004-7332, A
[0005]
The speaker shown in FIG. 7 uses the suspension holder 6A that firmly supports the diaphragm
3A, so the weight is large, and it is not a big problem for high-output bass applications, but the
middle-high tone The problem is that the driving efficiency is low because the weight is heavy.
[0006]
Therefore, an object of the present invention is to further increase the driving efficiency in a low
distortion speaker.
[0007]
In order to achieve this object, the present invention provides a frame, a diaphragm whose outer
peripheral side is supported by the frame, a voice coil body connected to the diaphragm, and a
voice coil of the voice coil body. The voice coil includes: a magnetic circuit movably disposed in a
magnetic gap; and an edge body having a portion on the magnetic gap side of the voice coil body
supported by the diaphragm connecting portion supported by the frame, the edge body being air
permeable And a connection portion having heat resistance, and an edge portion made of a
flexible material in a ring shape connected to the connection portion, and the edge portion
protrudes upward and downward intermittently in the circumferential direction The
configuration is as follows.
[0008]
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According to this configuration, distortion of the speaker can be suppressed, and the drive
efficiency can be improved by weight reduction, and the speaker can be appropriately used for
middle and high-pitched sounds.
[0009]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
[0010]
FIG. 1 is a cross-sectional view showing a speaker according to the present invention, and a
magnetic circuit 1 disposed at the center of the bottom of a mortar-shaped frame 5 comprises a
disk-shaped magnet 1a, a disk-shaped plate 1b and a cylindrical yoke 1c. And a cylindrical
magnetic gap 8 opened toward the upper surface side of the magnetic circuit 1 is formed
between the inner peripheral side surface of the side wall portion of the yoke 1c and the outer
peripheral side surface of the plate 1b. .
[0011]
Further, the voice coil body 2 has a structure in which the voice coil 2b is wound around the
outer peripheral portion of the cylindrical main body 2a, and the voice coil 2b is disposed to be
vertically movable with respect to the magnetic gap 8 Thus, the thin plate-like diaphragm 3
connected to the upper outer peripheral portion of the cylindrical main body 2a of the voice coil
body 2 is vibrated.
[0012]
A dust cap 9 is provided on the upper end portion of the cylindrical main body 2a of the voice
coil body 2 as a dustproof measure.
[0013]
The diaphragm 3 is a portion serving as a sound source of the speaker, and is mainly made of
pulp and resin having both high rigidity and internal loss, and the frame 5 through the edge 4
with the outer peripheral end protruding upward. The inner peripheral end portion is connected
and fixed to the outer peripheral side of the main body 2 a of the voice coil body 2.
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The edge 4 is formed of a material such as urethane, foam rubber, SBR rubber or cloth so as not
to apply a movable load to the diaphragm 3.
[0014]
As shown in FIG. 1, the ring-shaped connecting portion 7 a of the edge body 7 is connected to
the magnetic circuit 1 side of the fixed portion of the diaphragm 3 on the outer peripheral side of
the main body 2 a of the voice coil body 2. The outer peripheral end portion is connected to the
frame 5 via the ring-shaped edge portion 7b.
[0015]
The ring-shaped connecting portion 7a is formed by solidifying a material such as cloth in a
corrugated ring structure, and when the movable dimension of the voice coil body 2 is small, it is
structured to follow the downward movement and expand and contract. However, when the
upper and lower movable dimensions of the voice coil body 2 are large, as described later, the
ring-shaped edge portion 7b follows the upward and downward movement.
[0016]
Further, the ring-shaped connection portion 7a is formed by solidifying a material such as cloth
in a corrugated ring structure as described above, and although not shown, it is provided with an
air vent and is air-permeable, edge body There is less to be the load of 7 up and down movement.
[0017]
Furthermore, since the ring-shaped connection portion 7a is formed by solidifying a material
such as cloth in a corrugated ring structure as described above, it has heat resistance, and the
ring-shaped connection portion 7a is generated by heat generation of the voice coil 2b of the
voice coil body 2. As a matter of course, the ring-shaped edge portion 7b, in which the ringshaped connection portion 7a intervenes, does not thermally deteriorate the connection portion
7a.
[0018]
Now, when an audio signal is applied to the voice coil 2b of the voice coil body 2 in such a
structure, the voice coil body 2 moves upward and downward by reacting with the magnetic field
of the magnetic gap 8, and the movement causes the diaphragm to move. 3 vibrates and a sound
is emitted from the speaker, and in particular, by providing the ring-shaped edge portion 7b at
the outer peripheral end of the ring-shaped connection portion 7a of the edge body 7, distortion
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of the speaker is caused due to the following reason. And the driving efficiency of the speaker is
further enhanced.
[0019]
The ring-shaped edge portion 7 b is conventionally connected to the frame 5 and the voice coil
body 2 at both outer ends thereof to suppress rolling when the voice coil body 2 is moved, but in
the present embodiment, In order to make it easy to follow the movement of the voice coil body
2, this ring-shaped edge portion 7b is configured to protrude upward and downward
intermittently in the circumferential direction as shown in FIGS. I am giving it to you.
[0020]
That is, as described above, by applying an audio signal to the voice coil 2b of the voice coil body
2, it reacts with the magnetic field of the magnetic gap 8 to move the voice coil body 2 upward
and downward. When the amplitude amount of 2 is small, the ring-shaped connecting portion 7a
does not become a heavy load for the movement of the voice coil body 2, but as the amplitude
amount of the voice coil body 2 increases, the ring-shaped connecting portion 7a becomes
Smooth up, it will be a load that impedes the downward movement.
[0021]
Therefore, in the present embodiment, the outer peripheral portion of the ring-shaped
connecting portion 7a is connected to the frame 5 via the ring-shaped edge portion 7b, and in
this case, the movable width of the voice coil body 2 becomes large. When the connection 7a is
loaded, a stress is applied to the ring-shaped edge 7b, and the ring-shaped edge 7b is elastically
deformed according to the stress.
[0022]
Therefore, even when the amount of amplitude of the voice coil body 2 is increased as described
above, the presence of the ring-shaped edge portion 7 b makes it difficult to inhibit the
amplitude, and the reduction of the driving efficiency is suppressed.
[0023]
In the present embodiment, the voice coil body 2 is supported by the two supports of the edge 4
and the edge body 7 (the combination of the ring-shaped connecting portion 7a and the ringshaped edge portion 7b) in the upper and lower directions. However, in order to increase the
driving efficiency of the diaphragm 3, the edge 4 is made thinner and lighter in weight, thereby
reducing the weight of the diaphragm 3 and the edge 4 The structure is designed to improve the
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driving efficiency.
[0024]
However, if the edge 4 is made thin, the support strength of the voice coil body 2 is reduced, and
accordingly, the ring-shaped edge portion 7 b of the edge body 7 is made thicker than the edge
4, whereby the support strength of the voice coil body 2 To prevent it from falling.
As a result, the elastic modulus of the edge body 7 (the combination of the ring-shaped
connecting portion 7 a and the ring-shaped edge portion 7 b) is larger (harder) than the elastic
modulus of the edge 4.
[0025]
According to the above configuration, since the support by the edge body 7 (the combination of
the ring-shaped connecting portion 7a and the ring-shaped edge portion 7b) is dominant in the
support of the voice coil body 2, the upper and lower portions of the diaphragm 3 are provided.
In order to suppress the dynamic distortion, it is necessary to make the upper and lower loads of
the edge body 7 (the combination of the ring-shaped connection 7a and the ring-shaped edge 7b)
be in the same state as much as possible.
[0026]
Here, since the ring-shaped connecting portion 7a has only a slight amplitude as described
above, particularly in the present embodiment, in order to make the upper and lower loads of the
ring-shaped edge portion 7b as equal as possible, FIGS. It has a configuration of 6.
[0027]
Next, the ring-shaped edge portion 7b according to the present embodiment is formed of a
rubber material or a synthetic resin material, and is equally divided into six in the circumferential
direction as shown in FIGS. Intermittently in the upper and lower direction in the three, and as a
result, three are projected upward, and three are projected downward.
[0028]
More specifically, in FIG. 2 and FIG. 3, A is an upward protrusion and B is a downward
protrusion.
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[0029]
Further, a is a triangular protrusion extending upward following the protrusion A, b is a
triangular protrusion extending downward following the protrusion B, and these triangular
protrusions a and b are protrusions In the switching part to A and B, it is a very important
composition also in order not to make a vertical wall part as much as possible.
[0030]
As a whole, the ring-shaped edge portion 7b has substantially the same upper and lower loads in
the circumferential direction.
[0031]
That is, according to the present embodiment, the upper and lower loads of the edge body 7 (the
combination of the ring-shaped connecting portion 7a and the ring-shaped edge portion 7b)
substantially supporting the voice coil body 2 are the same. Is a major feature of
[0032]
With this feature, the upper and lower amplitudes of the diaphragm 3 are substantially
symmetrical in the upper and lower directions, so that distortion in the speaker can be reduced,
and the edge 4 of a large area on the outer periphery of the diaphragm 3 is made thin. As a
result, the speaker with high driving efficiency can be used even for middle and high tones.
[0033]
The present invention can reduce distortion of the speaker and improve the driving efficiency,
and is particularly useful for middle and high frequency speakers.
[0034]
The sectional view of the speaker in one embodiment of the present invention The perspective
view of the main part The perspective view of the main part The left view of the main part The
front view of the main part The front view The main view The rear view of the main part
Explanation of sign
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[0035]
Reference Signs List 1 magnetic circuit 2 voice coil body 2 b voice coil 3 diaphragm 4 edge 5
frame 7 edge body 7 a ring-shaped connection portion 7 b ring-shaped edge portion 8 magnetic
gap
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