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DESCRIPTION JP2008092030

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DESCRIPTION JP2008092030
An object of the present invention is to provide a thin speaker which can achieve high output and
significantly reduced distortion. In order to achieve this object, according to the present
invention, first and second magnets 11 and 13 disposed obliquely or substantially horizontally
via a magnetic gap 18 and move to the magnetic gap 18 The voice coil body 21 freely disposed,
the diaphragm 22 coupled to the voice coil body 21, and the first and second dampers 15 and 16
are coupled to the upper portion of the voice coil body 21. The first damper 15 has one end
connected to the upper portion of the voice coil body 21 and is disposed above the first magnet
11, and the second damper 16 connected to the lower portion of the voice coil body 21. The
second magnet 13 is disposed below the second magnet 13. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices and information
communication devices.
[0002]
A conventional speaker will be described with reference to FIG.
[0003]
FIG. 2 shows a cross-sectional view of a conventional speaker.
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1
[0004]
According to FIG. 2, the magnetized magnet 1 is coupled to the lower plate 3 having the center
pole 3A, the upper plate 2 is coupled to the opposite side of the magnet 1 coupled to the lower
plate 3, and these are of the external magnet type. The magnetic circuit 4 is configured.
[0005]
The frame 6 is coupled to the magnetic circuit 4, and the diaphragm 7 is coupled to the
peripheral portion of the frame 6.
[0006]
The voice coil body 8 is coupled to the diaphragm 7, and the voice coil body 8 is inserted into the
magnetic gap 5 of the magnetic circuit 4 to constitute a speaker.
[0007]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP, 2005-51283, A
[0008]
However, in the conventional speaker, there is a problem that the voice coil body 8 which is a
drive system component causes rolling at a large amplitude to generate distortion or abnormal
sound.
[0009]
The cause of this rolling is that the voice coil body 8 having a relatively heavy weight is
supported by the diaphragm 7 and is supported by only the upper end of the voice coil body 8 in
a so-called cantilever state. When the voice coil body 8 swings up and down like a pendulum at
the time of large amplitude, there is a problem that abnormal sound is generated due to
distortion due to rolling or gap failure.
[0010]
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Therefore, the object of the present invention is to solve such a problem and to provide a speaker
capable of increasing the sound pressure of high output and reducing distortion of the speaker.
[0011]
And in order to achieve this object, according to the present invention, first and second magnets
disposed obliquely or substantially horizontally through a magnetic gap, and a voice coil body
movably disposed in the magnetic gap A diaphragm coupled to the voice coil body and first and
second dampers, wherein the diaphragm is coupled to an upper portion of the voice coil body,
and the first damper is connected to an upper end of the voice coil body At the same time, the
second damper is disposed above the first magnet, and one end of the second damper is
connected to the lower portion of the voice coil body and the second damper is disposed below
the second magnet.
[0012]
The present invention can generate a large driving force by using two magnets, which are the
first magnet and the second magnet, to increase the sound pressure of high output, and dampers
above and below the voice coil body. As a result of the mounting of the speaker, the so-called
double-supported beam structure prevents rolling of the voice coil body even at a large
amplitude, thereby reducing distortion and gap defects of the speaker.
[0013]
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
[0014]
FIG. 1 is a cross-sectional view showing a speaker according to the present invention, in which a
first magnet 11 and a first plate 12 are disposed by adhesion at the center of a lower yoke 17a,
and a second magnet 13 is provided inside an upper yoke 17b. The second plate 14 is arranged
by adhesion.
The lower yoke 17 a and the upper yoke 17 b are held by a frame 23.
[0015]
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The first magnet 11 and the first plate 12 are disposed diagonally or substantially horizontally to
the second magnet 13 and the second plate 14, and the lower yoke 17a, the upper yoke 17b, and
the first The magnet 11, the first plate 12, the second magnet 13, and the second plate 14
constitute a magnetic circuit.
The magnetic circuit of such a configuration is called a diagonal magnetic circuit.
[0016]
The magnetic gap 18 is formed by the first magnet 11, the first plate 12 and the second magnet
13, and the second plate 14 so as to open toward the upper surface side.
[0017]
The voice coil body 21 has a structure in which a coil 20 is wound around the outer periphery of
a cylindrical bobbin 19 and is disposed movably in the vertical direction with respect to the
magnetic gap 18. It becomes a structure used as an axis which vibrates diaphragm 22 connected
to the perimeter.
[0018]
The first damper 15 has a disk-shaped corrugated structure, and the outer peripheral end is
connected to a position near the upper end above the coil 20 of the voice coil body 21, and the
inner peripheral end has a convex shape It is connected to the upper end of the convex part of
the first plate 12.
On the other hand, the second damper 16 has a disc-shaped corrugated structure, and the inner
peripheral end is connected to the lower end of the voice coil body 21 below the coil 20, and the
outer peripheral end is upper with the lower yoke 17a. It is connected to the connection of the
yoke 17b.
This corrugated structure is a wave-like ring structure having elasticity, and is configured to
expand and contract in response to the drive of the voice coil body 21, and easily follows the
drive of the voice coil body 21.
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[0019]
By applying an audio signal to the coil 20 of the voice coil body 21, the voice coil body 21 is
driven in the vertical direction in response to the magnetic field of the magnetic gap 18, and the
diaphragm 22 is vibrated by this drive to emit sound from the speaker It is
[0020]
Since the speaker of the present invention forms the magnetic gap 18 using two magnets of the
first magnet 11 and the second magnet 13, the voice coil body 21 can generate a large driving
force, As a result, the sound output by the diaphragm 22 can also be made large.
[0021]
Further, in such a magnetic circuit configuration, since a space for disposing the second damper
16 can be provided below the second magnet 13, the second damper 16 is disposed at this
position. The inner peripheral end of the damper 16 can be connected to the lower end of the
voice coil body 21.
As a result, the voice coil body 21 can be attached with the first damper 15 at the upper end and
the second damper 16 at the lower end. The rolling of the body 21 can be prevented.
[0022]
In the above embodiment, the shape of the speaker has been described as being circular, but it is
a matter of course that it may be elliptical or elongated as long as it has the above configuration.
[0023]
INDUSTRIAL APPLICABILITY The present invention can increase the sound pressure of high
output and reduce distortion and gap defects in a thin speaker, and is useful for speakers used in
various acoustic devices and information communication devices.
[0024]
Cross-sectional view of a loudspeaker according to an embodiment of the present invention
Cross-sectional view of a conventional loudspeaker
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Explanation of sign
[0025]
11 first magnet 12 first plate 13 second magnet 14 second plate 15 first damper 16 second
damper 17 a lower yoke 17 b upper yoke 18 magnetic gap 19 bobbin 20 coil 21 voice coil body
22 diaphragm 23 frames
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