JP2007158883

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DESCRIPTION JP2007158883
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 movably arranges a frame 5, a magnetic circuit 1 supported by the frame 5,
and a magnetic gap 8 provided in the magnetic circuit 1. The voice coil body 2 and the
diaphragm 3 whose outer peripheral end is connected to the frame 5 via the first edge 4 and
whose inner peripheral end is connected to the voice coil 2, and the diaphragm 3 A damper 10
provided on the magnetic circuit 1 side, having an outer peripheral end connected to the frame 5,
and an inner peripheral end connected to the voice coil body 2, and the outer peripheral end of
the damper 10 The second edge 11 is connected to the frame 5 through the second edge 11 and
the first protrusion 11 a protruding toward the diaphragm 3 and the first protrusion 11 a A
second projection 1 projecting in the opposite direction It is obtained by a structure having a and
b. [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. 4, 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
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further, the back surface of the diaphragm 3A is connected to the frame 5A via the suspension
holder 6A and the edge 7A.
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. 4 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-pitched sound 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 An end portion is connected to the
frame via the first edge, and an inner peripheral end portion is provided on the magnetic circuit
side from the diaphragm and an outer peripheral end portion is provided on the magnetic circuit
side from the diaphragm. A damper connected to the frame and having an inner peripheral end
connected to the voice coil body, the outer peripheral end of the damper being connected to the
frame via a second edge, and the second edge being connected The structure has a first
protrusion projecting toward the diaphragm and a second protrusion projecting in the opposite
direction to the first protrusion.
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[0007]
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
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.
[0012]
As shown in FIGS. 1 and 2, the damper 10 has its inner peripheral end connected to the magnetic
circuit 1 side of the voice coil body 2 fixed to the diaphragm 3, and the outer peripheral end is
separate from the damper 10. It is connected to the frame 5 via the edge 11.
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 originally connected to the frame 5 and the voice coil body 2 at the inner and
outer ends thereof to suppress rolling when the voice coil body 2 is movable, and to make it easy
to follow the movement of the voice coil body 2 It is corrugated and elastic.
[0015]
And by making it like a corrugated plate, when the amplitude amount is small, the load on
moving the voice coil body 2 is not a large load, but the load increases as the amplitude amount
of the voice coil body 2 increases. turn into.
[0016]
Therefore, in the present embodiment, the outer peripheral portion of the damper 10 is
connected to the frame 5 via the edge 11. If this is done, the movable width of the voice coil body
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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 edge 4 has a reduced thickness to reduce its weight,
thereby reducing the weight of the diaphragm 3 and the edge 4.
[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 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 the edge 11 There is a need to make
the upper and lower loads of the combination as identical as possible.
[0021]
So, in this embodiment, the edge 11 is the 1st protrusion part 11a which protrudes toward the
said diaphragm 3, and the 2nd protrusion part 11b which protrudes in the opposite direction to
this 1st protrusion part 11a. And a structure having
[0022]
That is, the damper 10 has a corrugated plate-like ring structure as is well known, and has a
substantially symmetrical shape in the vertical direction, so that the vertical load of itself is
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substantially the same.
[0023]
Therefore, in order to make the vertical load of the combination of the damper 10 and the edge
11 be as the same as possible, it is necessary to make the vertical load of the edge 11 as the
same as possible.
[0024]
Therefore, in the present embodiment, as described above, the edge 11 is a first protrusion 11 a
that protrudes toward the diaphragm 3 and a second protrusion that protrudes in the opposite
direction to the first protrusion 11 a. And the protruding portion 11b of the lower end 11b,
thereby making the upper and lower loads of the edge 11 coupled body as possible as possible.
[0025]
That is, the first projecting portion 11a of the edge 11 and the second projecting portion 11b are
made to project in the opposite direction so that the difference in vibration load in the vertical
direction is less likely to occur.
[0026]
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.
[0027]
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 it becomes difficult to secure the linearity, the elasticity of edge 11 compensates for
the linearity, so that the edge It is desirable to set the elastic modulus of 11 to be larger (harder)
than the elastic modulus of the damper 10.
[0028]
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,
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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.
[0029]
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.
[0030]
FIG. 3 shows another embodiment of the present invention, in which the shape of the edge 11 is
modified as compared to the embodiment of FIG.
[0031]
That is, in the embodiment of FIG. 2, the protrusion 11a is protruded to the diaphragm 3 side,
and the protrusion 11b is protruded in the opposite direction. However, in the embodiment of
FIG. It is made to project and make the protrusion part 11a project in the opposite direction so
that the difference in the vibration load in the vertical direction is less likely to occur.
[0032]
The present invention can reduce distortion of the speaker and improve the driving efficiency,
and is particularly useful for middle and high frequency speakers.
[0033]
Cross-sectional view of a loudspeaker according to an embodiment of the present invention.
Enlarged cross-sectional view of relevant parts. Cross-sectional view of a loudspeaker according
to another embodiment of the present invention. Cross-sectional view of a conventional
loudspeaker
Explanation of sign
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[0034]
Reference Signs List 1 magnetic circuit 2 voice coil body 3 diaphragm 4 (first) edge 5 frame 8
magnetic gap 10 damper 11 (second) edge 11a, 11b protrusion
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