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JP2007306202

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DESCRIPTION JP2007306202
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. A frame 5, a magnetic circuit 1
supported by the frame 5, a voice coil body 2 movably disposed with respect to a magnetic gap 8
provided in the magnetic circuit 1, and an outer peripheral portion The diaphragm 3 is
connected to the frame 5 via the first edge 4 and the inner peripheral portion is provided closer
to the magnetic circuit 1 than the diaphragm 3 is connected to the voice coil body 2, and the
inner peripheral portion is First and second dampers 10a and 10b connected to the voice coil
body 2 and second and third edges where outer peripheries of the first and second dampers 10a
and 10b are connected to the frame 5, respectively 11a and 11b, and the second edge 11a is
structured to protrude to the side of the diaphragm 3 or the opposite side, and the third edge
11b is a protrusion direction of the second edge 11a. Opposite direction And configured to have
a protruding structure. [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. 6, 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 connected via the edge 4A. The diaphragm 3A is
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connected to the frame 5A, and 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. 6 uses the suspension holder 6A that firmly supports the diaphragm
3A, so the weight is increased, and it is not a 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 Part is connected to the frame via the
first edge, and an inner peripheral part is provided closer to the magnetic circuit than the
diaphragm connected to the voice coil body, and an inner peripheral part is the voice coil A first
and a second damper connected to the body, and a second and a third edge respectively
connecting an outer peripheral portion of the first and the second damper to the frame; The third
edge is configured to have a protruding structure in a direction opposite to the direction in which
the second edge protrudes, while the structure is such that it protrudes to the diaphragm side or
the opposite side.
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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 adhesively
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 resin, foam rubber, SBR rubber, cloth
or the like so as not to apply a movable load to the diaphragm 3.
[0012]
As shown in FIG. 1 and FIG. 2, the dampers 10a and 10b have a predetermined distance (k) on
the magnetic circuit 1 side than the diaphragm 3 fixing portion on the outer peripheral side of
the main body 2a of the voice coil 2 The outer peripheral end portion is connected to the frame 5
via the edges 11a and 11b separate from the dampers 10a and 10b.
[0013]
A spacer A is interposed and integrated between the edges 11a and 11b opposite to the dampers
10a and 10b, and is fixed to the frame 5 in this state.
[0014]
The dampers 10a and 10b have a ring-shaped corrugated plate structure, and are configured to
expand and contract in accordance with the movement of the voice coil body 2, and the
diaphragm 3 as well as the edge 4 provided on the diaphragm 3. It is formed of a material such
as urethane foam resin, foam rubber, SBR rubber and cloth so as not to apply a large movable
load.
The edge 11a has a semicircular cross-section that protrudes toward the diaphragm 3 and the
edge 11b protrudes toward the opposite side.
[0015]
The edges 11a and 11b are formed of a material such as a urethane foam resin, a foam rubber,
an SBR rubber, or a cloth so as not to apply a large movable load to the diaphragm 3.
[0016]
The elastic modulus of the edge 4 is the smallest (soft), next the elastic modulus of the edge 11 a
is small (soft), and the elastic modulus of the edge 11 is one. The reason is described in detail
later (for example, the edge 4 and the edge 11a are formed of urethane resin, and the edge 11b
is formed of rubber).
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[0017]
The speaker of this embodiment also applies an audio signal to the coil 2b of the voice coil body
2, reacts with the magnetic field of the magnetic gap 8, moves the voice coil body 2 upward and
downward, and vibrates due to this movement. The plate 3 vibrates and a sound is emitted.
In particular, by providing the edges 11a and 11b at the outer peripheral end portions of the
dampers 10a and 10b, distortion of the speaker is suppressed, and the driving efficiency of the
speaker is further enhanced.
[0018]
The dampers 10a and 10b are originally connected to the voice coil body 2 and the frame 5 at
both outer ends thereof to suppress rolling when the voice coil body 2 is movable, and follow the
movement of the voice coil body 2 In order to make it easy to use, it has a ring-shaped
corrugated plate structure and has elasticity.
[0019]
And since the ring-shaped corrugated plate structure is used in this way, when the amplitude
amount is small, the load on moving the voice coil body 2 is not a large load, but as the amplitude
amount of the voice coil body 2 increases, the load Becomes large.
[0020]
Therefore, in the present embodiment, the outer peripheral portions of the dampers 10a and 10b
are connected to the frame 5 via the edges 11a and 11b. In this way, the movable width of the
voice coil body 2 becomes large, and the damper 10a When the load 10b is loaded, stress is
applied to the edges 11a and 11b, and in response to this stress, the edges 11a and 11b are
elastically deformed from a substantially circular cross-sectional state.
[0021]
For this reason, even when the amplitude amount of the voice coil body 2 increases in this
manner, the amplitudes are less likely to be inhibited by the presence of the dampers 10a and
10b and the edges 11a and 11b, and the reduction of the driving efficiency is suppressed.
become.
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[0022]
In the present embodiment, the voice coil body 2 is vertically supported by three supports of the
edge 4 and a combination of the edge 10 and the dampers 10a, 10b and the edge 11a, 11b. In
order to increase efficiency, the edge 4 with the largest planar area is reduced in thickness to
reduce its weight, thereby reducing the weight of the diaphragm 3 and the edge 4 and enhancing
the driving efficiency of the diaphragm 3 And
[0023]
However, if the edge 4 is made thin, the supporting strength of the voice coil body 2 is reduced,
so the edges 11a and 11b are made thicker than the edge 4 by that amount, thereby preventing
the supporting strength of the voice coil body 2 from being reduced. (As a result, the elastic
modulus of the two combined bodies formed by the dampers 10a and 10b and the edges 11a
and 11b is larger (harder) than the elastic modulus of the edge 4).
[0024]
With the above configuration, since the support of the voice coil body 2 is dominated by the
support by the two combined bodies of the dampers 10a, 10b and the edges 11a and 11b, the
distortion of the vertical movement of the diaphragm 3 is suppressed. There is a need to make
the upper and lower loads in the two combined bodies of the dampers 10a and 10b and the
edges 11a and 11b as the same state as possible.
[0025]
Therefore, first, the shape of the edge 11b in the embodiment shown in FIG. 2 will be examined.
[0026]
Since the edge 11b 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
direction of the diaphragm 3 Is less likely to deform.
[0027]
Therefore, in order to absorb the difference in the ease of deformation in the vertical direction in
the edge 11 b, the edge 11 a is provided.
[0028]
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As well known, the dampers 10a and 10b have a ring-shaped corrugated plate structure, and a
first protrusion projecting toward the diaphragm 3 and a direction opposite to the first
protrusion are provided. The structure has a plurality of protruding second protrusions, and
basically, the loads in the vertical direction can be substantially the same.
[0029]
However, since the edge 11 b protrudes downward, the edge 11 a is provided in a state of facing
the edge 11 b in order to absorb the difference in vertical load on the edge 11 b (which is easily
deformed downward).
[0030]
As shown in FIG. 2, the edge 11a in the present embodiment is shaped so as to protrude in the
direction of the diaphragm 3 (that is, upward in the figure), so it is easily deformed upward in
FIG. It is difficult to deform.
Therefore, if the edges 11a and 11b are opposed to each other in a substantially circular cross
section, the magnitudes of the vertical loads of the edges 11a and 11b can be made substantially
the same.
[0031]
More specifically, the edge 11a has a slightly smaller (softer) elastic modulus than the edge 11b.
The reason is that the edge 4 connecting the outer peripheral end portion of the diaphragm 3 to
the frame 5 has a shape projecting upward as shown in FIG. 1 in the present embodiment, so the
load difference due to the edge 4 should be taken into consideration. It is because it must be
done.
[0032]
As described above, the thickness of the edge 4 is reduced and the weight thereof is reduced,
whereby the weight of the diaphragm 3 and the edge 4 is reduced and the driving efficiency of
the diaphragm 3 is enhanced. Although the size of the load is not so large, if it projects upward in
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FIG. 1, it is also easily deformed upward and conversely downward, which is a slight difference in
vertical load, but It will come out.
[0033]
Therefore, in the present embodiment, as described above, the edge 11a has a slightly smaller
(softer) elastic modulus than the edge 11b.
[0034]
That is, in FIG. 1 and FIG. 2, the voice coil body 2 is easier to move downward in the upper part
of each drawing because of the shapes of the edges 4 and 11a, and upward in the lower part
because of the shape of the edge 11b. It is easier to move than to
From such a point of view, it is necessary to consider the edge 11a and the edge 4 as one set
with respect to one edge 11b, and for this reason, as described above, the edge 11a has a slight
elastic modulus than the edge 11b. It is small (soft).
As a result, the upper and lower amplitudes of the diaphragm 3 become substantially
symmetrical in the vertical direction, and distortion in the speaker can be reduced. Furthermore,
since the largest edge 4 of the planar shape is reduced in weight High speaker.
[0035]
In the configuration in which the dampers 10a and 10b are connected to the frame 5 via the
edges 11a and 11b as described above, as described above, the ring-shaped wave is used until
the movable width of the voice coil body 2 is increased to a certain extent. The dampers 10a and
10b of the plate structure can ensure the linearity of power linearity, and when the movable
width of the voice coil body 2 becomes a predetermined value or more and the linearity becomes
difficult to ensure, the elasticity of the edges 11a and 11b makes the linearity It is desirable that
the total elastic modulus of the edges 11a and 11b be set larger (harder) than the elastic
modulus of the dampers 10a and 10b.
[0036]
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Further, it is desirable that the damper 10a and the edge 11a 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 10a and the edge 11a More specifically, by setting the elastic modulus
in the connection area between the damper 10a and the edge 11a larger (harder) than the elastic
modulus of the damper 10a and the edge 11a, the independence of both is secured.
Further, it is preferable that the damper 10b and the edge 11b also have different elastic moduli,
and that both be set independently to function according to the movable width of the voice coil
body 2, and between the damper 10b and the edge 11b More specifically, by setting the elastic
modulus in the connection area between the damper 10b and the edge 11b to be larger (harder)
than the elastic modulus of the damper 10b and the edge 11b, the independence of both is
secured.
[0037]
In order to set the elastic modulus of the connection area between the dampers 10a and 10b and
the edges 11a and 11b larger (harder) than the elastic modulus of the dampers 10a and 10b and
the edges 11a and 11b, for example, the edges 11a and 11b The adhesive used to bond the
dampers 10a and 10b is made of a hard adhesive such as acrylic, or a reinforcing material is
attached to the connection area.
[0038]
3 to 5 show other embodiments, respectively, in which only the portion of the damper 10 and the
edges 11a and 11b of FIGS. 1 and 2 is changed, and the other portions are in the same state as
FIG. In FIGS. 3 to 5, the same parts as those in FIGS. 1 and 2 are denoted by the same reference
numerals to simplify the description.
[0039]
First, in the embodiment shown in FIG. 3, an edge 11 c is provided instead of the edge 11 a in
FIGS. 1 and 2.
The edge 11 c has a corrugated shape having two projecting shapes projecting in the diaphragm
3 side and one projecting shape in the opposite direction in cross section.
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[0040]
Further, this edge 11 c is also formed of a material such as a urethane foam resin, a foam rubber,
an SBR rubber, or a cloth so as not to apply a large movable load to the diaphragm 3.
[0041]
As shown in FIG. 3, the edge 11c in the present embodiment has two projecting shapes in the
direction of the diaphragm 3 (that is, the upper side in the figure) and one projecting shape in the
opposite direction. On the contrary, it is difficult to deform downward.
Therefore, if the edges 11b and 11c are combined as shown in FIG. 3, the magnitudes of the
vertical loads of the edges 11b and 11c can be made substantially the same.
[0042]
To describe these edges 11b and 11c in more detail, the edge 11c has a slightly smaller (softer)
elastic modulus than the edge 11b.
The reason is that the edge 4 connecting the outer peripheral end portion of the diaphragm 3 to
the frame 5 has a shape projecting upward as in FIG. 3 in this embodiment as well, so the load
difference due to this edge 4 must be taken into consideration. It is because it must be done.
[0043]
As described above, the thickness of the edge 4 is reduced and the weight thereof is reduced,
whereby the weight of the diaphragm 3 and the edge 4 is reduced and the driving efficiency of
the diaphragm 3 is enhanced. Although the magnitude of the load is not so large, if it projects
upward in FIG. 3, it is also likely to be deformed upward and vice versa, and this is a slight
difference in vertical load, though It will come out.
[0044]
Therefore, in the present embodiment, as described above, the edge 11 c has a slightly smaller
(softer) elastic modulus than the edge 11 b.
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[0045]
That is, in FIG. 3, the voice coil body 2 is more easily moved upward than in FIG. 3 because of the
shapes of the edges 4 and 11c, and because of the shape of the edge 11b. It is easy to move.
From such a point of view, it is necessary to consider the edge 11c and the edge 4 as one set with
respect to one edge 11b, and for such a reason, as described above, the edge 11c has a smaller
elastic modulus than the edge 11b. It is small (soft).
[0046]
As a result, the upper and lower amplitudes of the diaphragm 3 become substantially
symmetrical in the vertical direction, and distortion in the speaker can be reduced. Furthermore,
the edge 4 with the largest planar area is made thin and lightened. , A speaker with high driving
efficiency.
[0047]
Next, in the embodiment shown in FIG. 4, an edge 11 d is provided in place of the edge 11 b in
FIGS. 1 and 2.
The edge 11d has a corrugated shape having one projecting shape projecting on the side of the
diaphragm 3 and two projecting shapes in the opposite direction in cross section.
[0048]
The edge 11d is also formed of a material such as urethane foam resin, foam rubber, SBR rubber
or cloth so as not to apply a large movable load to the diaphragm 3.
[0049]
As shown in FIG. 4, the edge 11d in the present embodiment has one projecting shape in the
direction of the diaphragm 3 (that is, the upper side of the figure) and two projecting shapes in
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the opposite direction. On the contrary, it is difficult to deform upward.
Therefore, if the edges 11a and 11d are combined as shown in FIG. 4, the magnitudes of the
vertical loads of the edges 11a and 11d can be made substantially the same.
[0050]
More specifically, the edges 11a and 11d have a slightly smaller (softer) elastic modulus than the
edge 11d.
The reason is that the edge 4 connecting the outer peripheral end portion of the diaphragm 3 to
the frame 5 has a shape projecting upward as in FIG. 4 in this embodiment as well, so the load
difference due to this edge 4 should be taken into consideration. It is because it must be done.
[0051]
As described above, the thickness of the edge 4 is reduced and the weight thereof is reduced,
whereby the weight of the diaphragm 3 and the edge 4 is reduced and the driving efficiency of
the diaphragm 3 is enhanced. Although the magnitude of the load is not so large, if it projects
upward in FIG. 4, it is also easily deformed upward and conversely downward, which is a slight
difference in vertical load, but It will come out.
[0052]
Therefore, in the present embodiment, as described above, the edge 11a has a slightly smaller
(softer) elastic modulus than the edge 11d.
[0053]
That is, as the voice coil body 2 in FIG. 4, it is easier to move upward in the upper part of each
drawing because of the shape of the edges 4 and 11 a, and downward because of the shape of
the edge 11 d. It is easy to move.
From such a point of view, it is necessary to consider the edge 11a and the edge 4 as one set
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with respect to one edge 11d, and for this reason, as described above, the edge 11a has a slight
elastic modulus than the edge 11d. It is small (soft).
[0054]
As a result, the upper and lower amplitudes of the diaphragm 3 become substantially
symmetrical in the vertical direction, so that distortion in the speaker can be reduced, and the
edge 4 having the largest planar area is reduced in weight. High speaker.
[0055]
Next, in the embodiment shown in FIG. 5, the edge 11c of FIG. 3 and the edge 11d of FIG. 4 are
provided in place of the edges 11a and 11b of FIGS.
The edge 11d is in the form of a wave having a cross-sectional shape having one protruding
shape protruding toward the diaphragm 3 and two protruding shapes in the opposite direction.
Further, the edge 11c has a wave-like shape including two projecting shapes projecting to the
diaphragm 3 side and one projecting shape in the opposite direction in the cross-sectional state
as described above.
[0056]
The edges 11 c and 11 d are also formed of a material such as urethane foam resin, foam rubber,
SBR rubber, or cloth so as not to apply a large movable load to the diaphragm 3.
[0057]
As shown in FIG. 5, the edge 11d in the present embodiment has one projecting shape in the
direction of the diaphragm 3 (that is, the upper side of the figure) and two projecting shapes in
the opposite direction. On the contrary, it is difficult to deform upward.
Further, since the edge 11c has two projecting shapes in the direction of the diaphragm 3 (that
is, the upper side of the figure) and one projecting shape in the opposite direction, it is easily
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deformed upward in FIG. It is difficult.
[0058]
Therefore, if the edges 11c and 11d are combined as shown in FIG. 5, the magnitudes of the
vertical loads of the edges 11c and 11d can be made substantially the same.
[0059]
More specifically, the edge 11c has a slightly smaller (softer) elastic modulus than the edge 11d.
The reason is that the edge 4 connecting the outer peripheral end portion of the diaphragm 3 to
the frame 5 has a shape projecting upward as in FIG. 5 in this embodiment as well, so the load
difference due to this edge 4 must be taken into consideration. It is because it must be done.
[0060]
The edge 4 having a large flat area has a structure in which the thickness is reduced and the
weight is reduced as described above, and thereby the weight of the diaphragm 3 and the edge 4
is reduced and the driving efficiency of the diaphragm 3 is enhanced. Although the magnitude of
the load for vertical movement is not so large, if it still projects upward in FIG. 1, it is also easily
deformed upward and conversely, it is difficult to deform downward, which is the difference
between the vertical movement load Although it is slightly, it will come out.
[0061]
Therefore, in the present embodiment, as described above, the edge 11 c has a slightly smaller
(softer) elastic modulus than the edge 11 d.
[0062]
That is, in FIG. 5, the voice coil body 2 is more likely to move upward than in the figure due to
the shapes of the edges 4 and 11c, and it may move more than downward due to the shape of
the edge 11d. It is easy to do.
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From such a point of view, it is necessary to consider the edge 11c and the edge 4 as one set with
respect to one edge 11d, and for such a reason, as described above, the edge 11c has a slight
elastic modulus than the edge 11d. It is small (soft).
[0063]
As a result, the upper and lower amplitudes of the diaphragm 3 become substantially
symmetrical in the vertical direction, and distortion in the speaker can be reduced. Further, the
weight of the edge 4 is reduced. .
[0064]
The present invention can reduce distortion of the speaker and improve the driving efficiency,
and is particularly useful for middle and high frequency speakers.
[0065]
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: cross-sectional view of a loudspeaker
according to another embodiment of the present invention Cross section of loudspeaker in form
cross section of conventional loudspeaker
Explanation of sign
[0066]
Reference Signs List 1 magnetic circuit 2 voice coil body 3 diaphragm 4 (first) edge 5 frame 8
magnetic gap 10 a damper 10 b damper 11 a edge 11 b edge 11 c edge 11 d edge
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