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DESCRIPTION JP2007194701

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DESCRIPTION JP2007194701
The present invention relates to a speaker, and it is an object of the present invention to further
enhance driving efficiency in a speaker with small distortion. In order to achieve this object, the
present invention provides a damper 10 whose inner peripheral end is connected to a voice coil
body 2 on the magnetic circuit 1 side with respect to a diaphragm 3, and the outer peripheral
end of this damper 10 Is connected to the frame 5 via the second edge 11, and the second edge
11 projects to the diaphragm 3 side or the opposite side, and the damper 10 is directed to the
diaphragm 3 side. And a second protrusion 10b protruding in a direction opposite to the first
protrusion 10a. These first and second protrusions 10a and 10b Among them, the protrusion 10
a closest to the second edge 11 protrudes in the opposite direction to the protrusion direction of
the second edge 11. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
In the conventional speaker, as shown in FIG. 5, the voice coil body 2A movably disposed 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 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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Further, by making the projecting shapes of the edges 4A and 7A in the opposite directions, the
vertical amplitude of the diaphragm 3A is vertically symmetrical, thereby reducing distortion in
the speaker.
[0003]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known. JP, 2004-7332, A
[0004]
The speaker shown in FIG. 5 uses the suspension holder 6A for firmly supporting the diaphragm
3A, so the weight is large, and it is not a big problem for the low-pitched speaker to which a large
output is added. The problem is that the drive efficiency is lowered due to the weight increase.
[0005]
Therefore, an object of the present invention is to further increase the driving efficiency in a low
distortion speaker.
[0006]
And in order to achieve this object, according to the present invention, a frame, a magnetic circuit
supported by the frame, a voice coil body movably disposed with respect to a magnetic gap
provided in the magnetic circuit, and an outer periphery The diaphragm is connected to the
frame via the first edge and the inner peripheral end is connected to the voice coil body, and is
provided closer to the magnetic circuit than the diaphragm, and the inner peripheral end is
connected to the frame. And a damper connected to the voice coil body, wherein an outer
peripheral end of the damper is connected to the frame via a second edge, the second edge being
on the diaphragm side or the opposite thereof The damper is structured to have a first protrusion
that protrudes toward the diaphragm and a second protrusion that protrudes in the opposite
direction to the first protrusion. These first and second Of the projecting portions, the projecting
portion closest to the second edge, wherein the projecting direction of the second edge is
obtained by a structure which projects to the opposite side.
[0007]
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With this configuration, it is possible to suppress distortion of the speaker and to improve the
driving efficiency by reducing the weight.
[0008]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
[0009]
FIG. 1 is a cross-sectional view showing a loudspeaker according to the present invention, in
which a magnetic circuit 1 disposed at the center of the bottom of a mortar-shaped frame 5 is
combined with a disk magnet 1a, a disk plate 1b and a cylindrical yoke 1c. 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.
[0010]
Further, the voice coil body 2 has a structure in which the coil 2 b is wound around the outer
peripheral portion of the cylindrical main body 2 a and is disposed movably in the vertical
direction with respect to the magnetic gap 8. The thin plate-like diaphragm 3 connected to the
upper outer peripheral portion is vibrated.
At the upper end portion of the voice coil body 2, a dust cap 9 is provided as a dustproof
measure.
[0011]
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 fixed to the
outer peripheral side of the main body 2 a of the voice coil body 2.
The edge 4 is formed of a material such as urethane, foam rubber, SBR rubber or cloth so as not
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to apply a movable load to the diaphragm 3.
[0012]
As shown in FIGS. 1 and 2, the damper 10 is connected at its inner peripheral end to the
magnetic circuit 1 side of the diaphragm 3 fixing portion on the outer peripheral side of the body
2 a of the voice coil body 2, and the outer peripheral end is And is connected to the frame 5 via
an edge 11 separate from the frame 5.
The damper 10 has a corrugated plate-like ring structure, and is configured to expand and
contract in response to the movement of the voice coil body 2, and to the diaphragm 3 in the
same manner as the edge 4 provided on the diaphragm 3. It is formed of a material such as
urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load.
[0013]
Then, an audio signal is applied to the coil 2b of the voice coil body 2 to react with the magnetic
field of the magnetic gap 8 to move the voice coil body 2 vertically, and this movement causes
the diaphragm 3 to vibrate and sound from the speaker In particular, by providing the edge 11 at
the outer peripheral end portion of the damper 10, distortion of the speaker is suppressed, and
further, the driving efficiency of the speaker is enhanced.
[0014]
The damper 10 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, the voice coil body 2 is used. In order to make it easy to follow the movement of the
ring, it has a ring-like corrugated plate and has elasticity.
[0015]
Due to the ring-shaped corrugated sheet, when the amplitude of the voice coil body 2 is small,
the damper 10 does not become a large load for the movement of the voice coil body 2, but the
voice coil body 2 The load increases as the amplitude of the signal increases.
[0016]
Therefore, in the present embodiment, the outer peripheral portion of the damper 10 is
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connected to the frame 5 via the edge 11. If this is done, the movable width of the voice coil body
2 becomes large and the damper 10 becomes a load. When this happens, stress is applied to the
edge 11, and in response to this stress, the edge 11 is elastically deformed.
[0017]
Therefore, even when the amount of amplitude of the voice coil body 2 is increased as described
above, the amplitude is less likely to be inhibited by the damper 10, and a decrease in drive
efficiency is suppressed.
[0018]
In the present embodiment, the voice coil body 2 is vertically supported by two supports of the
edge 4 and the combination of the damper 10 and the edge 11. However, in order to enhance the
driving efficiency of the diaphragm 3 The thickness of the edge 4 is reduced to reduce the weight
thereof, thereby reducing the weight of the diaphragm 3 and the edge 4 and enhancing the
driving efficiency of the diaphragm 3.
[0019]
However, since thinning the edge 4 reduces the supporting strength of the voice coil body 2, the
edge 11 is made thicker than the edge 4 by that amount, thereby preventing the supporting
strength of the voice coil body 2 from decreasing. (As a result, the elastic modulus of the
combination formed by the damper 10 and the edge 11 is larger (harder) than the elastic
modulus of the edge 4).
[0020]
With the above configuration, since the support by the combined body of the damper 10 and the
edge 11 is dominant in the support of the voice coil body 2, in order to suppress the distortion of
the vertical movement of the diaphragm 3, the damper 10 and There is a need to make the top
and bottom loading of the combination of edge 11 as identical as possible.
[0021]
Therefore, first, the shape of the edge 11 in the embodiment shown in FIG. 2 will be examined.
[0022]
Since the edge 11 in the embodiment shown in FIG. 2 is shaped so as to project in the direction
opposite to the diaphragm 3, it is easily deformed downward in FIG. 2, and conversely in the
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direction of the diaphragm 3 Is less likely to deform.
[0023]
Therefore, in order to absorb the difference in ease of deformation in the vertical direction in the
edge 11, the shape of the damper 10 is devised.
[0024]
As is well known, the damper 10 has a ring-shaped corrugated plate structure, and a first
protrusion 10 a protruding toward the diaphragm 3 and an opposite direction to the first
protrusion 10 a. Among the first and second protrusions 10a and 10b, the protrusion 10a closest
to the edge 11 is the edge. It was made to project on the opposite side to the protrusion direction
of 11, that is, to the diaphragm 3 side.
[0025]
For this reason, the outermost first projecting portion 10a is easily deformed upward, and the
diaphragm 3 is easily deformed downward in FIG. In conclusion, the vertical load of the
combination of the damper 10 and the edge 11 can be made the same state as much as possible,
which makes it difficult to make a difference between the vertical movement of the diaphragm 3
and cause the generation of vibration distortion. It can be suppressed.
[0026]
As is well known, the damper 10 has a ring-shaped corrugated plate structure, and a first
protrusion 10 a protruding toward the diaphragm 3 and an opposite direction to the first
protrusion 10 a. Among the first and second protrusions 10a and 10b, the protrusion 10a closest
to the edge 11 is the edge. It was made to project on the opposite side to the protrusion direction
of 11, that is, to the diaphragm 3 side.
[0027]
From the above results, the vertical amplitude of the diaphragm 3 is substantially symmetrical in
the vertical direction, so that distortion in the speaker can be reduced, and the edge 4 is reduced
in weight. Become.
The first projecting portion 10a on the outermost periphery has a projecting shape that is larger
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than the first and second projecting portions 10a and 10b on the inner peripheral side of the
first projecting portion 10a. Because the size is larger than the protruding portion 10 a, the size
is made to be a little closer.
[0028]
In the configuration in which the damper 10 is connected to the frame 5 via the edge 11 as
described above, the wave plate-like damper 10 is used until the movable width of the voice coil
body 2 is increased to some extent as described above. Since the linearity of power linearity can
be secured, and when the movable width of voice coil body 2 becomes a predetermined value or
more and the linearity becomes difficult to secure, the elasticity of edge 11 compensates for the
linearity by the elasticity of edge 11. The elastic modulus is preferably set to be larger (harder)
than the elastic modulus of the damper 10.
[0029]
Further, it is desirable that the damper 10 and the edge 11 have different elastic moduli and be
set so that both function independently according to the movable width of the voice coil body 2,
and between the damper 10 and the edge 11, More specifically, in the connection area between
the damper 10 and the edge 11, the independence of both can be secured by setting the elastic
modulus of the area to be larger (harder) than the elastic modulus of the damper 10 and the edge
11.
[0030]
When setting the elastic modulus of the connection area between the damper 10 and the edge
11 to be larger (harder) than the elastic modulus of the damper 10 and the edge 11, for example,
the type of adhesive for bonding the edge 11 and the damper 10 is acrylic. Or the edge 11 and
the damper 10 are integrated by insert molding to increase the thickness of the portion, or a
reinforcement material is attached to the connection area.
[0031]
3 and 4 show another embodiment of the present invention. In this embodiment, the shape of the
edge 11 is changed and projected upward as compared with the embodiment of FIG. 1 and FIG.
[0032]
And according to this, the protrusion part 10b of the outermost periphery couple | bonded with
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this edge 11 is made to project below.
Of course, the reason why the outermost peripheral projecting portion 10b has a projecting
shape larger than the first and second projecting portions 10a and 10b on the inner peripheral
side thereof is that the edge 11 is the first peripheral projecting portion. Because it is larger than
10a, it is for the size to be a little closer.
[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]
Cross-sectional view of a loudspeaker according to an embodiment of the present invention, an
enlarged cross-sectional view of the relevant part Cross-sectional view of a loudspeaker
according to another embodiment of the present invention
Explanation of sign
[0035]
REFERENCE SIGNS LIST 1 magnetic circuit 2 voice coil body 3 diaphragm 4 (first) edge 5 frame 8
magnetic gap 10 damper 10 a, 10 b protrusion 11 (second) edge
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