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JP2010206556

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2010206556
An object of the present invention is to achieve a thinner speaker and higher performance. In
order to achieve this object, the present invention installs a magnetic circuit 11 having a
magnetic gap 17 on the back surface of a central portion of a protector 18, and provides an
inverted conical diaphragm 13 on the magnetic circuit 11 side. A suspension holder 15 is
provided on the side opposite to the magnetic circuit 11 side, and the diaphragm 13 is coupled to
the frame 19 via the first edge 14 and the suspension holder 15 via the second edge 16. The
second edges 14 and 16 are loudspeakers that have substantially similar shapes similar to each
other at the boundary between the first and second edges. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
The conventional speaker is configured as shown in FIG.
[0003]
That is, as shown in FIG. 12, the speaker includes a magnetic circuit 1, a voice coil body 4 in
which at least a coil portion 3 is movably provided in a magnetic gap 2 of the magnetic circuit 1,
and a voice The magnetic gap 2 outward portion of the coil body 4 is configured to include the
diaphragm 5 whose inner periphery is connected, and the frame 7 whose outer periphery of the
diaphragm 5 is connected via the edge 6 .
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[0004]
That is, when an electric signal output from an audio amplifier or the like is input to the voice
coil portion 3 of the voice coil body 4, the voice coil body 4 is excited, and the exciting force is
transmitted to the diaphragm 5, and the diaphragm 5 is configured to vibrate air to convert an
electrical signal into sound.
[0005]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
Japanese Patent Application Laid-Open No. 11-275690
[0006]
In the above-mentioned conventional example, as shown in FIG. 12, the inner periphery of the
damper 8 is fixed between the voice coil portion 3 of the voice coil body 4 and the inner
periphery fixing portion of the diaphragm 5, and the outer periphery of the damper 8 is a frame
It is fixed to 7.
The damper 8 constitutes a suspension together with the edge 6 to prevent the voice coil body 4
from rolling when moving.
Further, as shown in FIG. 12, the damper 8 has a configuration in which a plurality of waveforms
are combined, and it is configured not to be a movable load of the voice coil body 4 as much as
possible.
[0007]
However, in the performance enhancement of the speaker in recent years, the existence of the
damper 8 causes a big problem.
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[0008]
That is, in the behavior of the voice coil body 4 toward the magnetic circuit 1 and the behavior
toward the opposite side of the magnetic circuit 1, the non-linearity and the asymmetry of the
movable load of the damper 8 are large, and the harmonic distortion resulting therefrom is At the
same time as the occurrence of a large amount of power linearity was to be degraded.
[0009]
FIG. 13 shows the power linearity of the conventional speaker and the displacement of the
diaphragm 5 with respect to the speaker input power.
A indicates the amplitude characteristic of the diaphragm 5 directed to the magnetic circuit 1,
and B indicates the amplitude characteristic of the diaphragm 5 in the opposite direction to the
magnetic circuit 1.
Further, FIG. 14 shows harmonic distortion characteristics of the conventional speaker, C is a
frequency characteristic of the speaker, D is a second harmonic distortion characteristic, and E is
a third harmonic distortion characteristic.
[0010]
In order to solve the problem of the power linearity deterioration and the harmonic distortion
characteristic caused by such non-linearity and asymmetry, all the companies make various
efforts to solve the non-linearity and asymmetry of the damper 8 However, as described above,
since the damper 8 is formed by combining a plurality of waveforms so as to reduce the movable
load, the damper 8 and the edge 6 are combined to constitute a suspension. It is difficult to
resolve harmonic asymmetry and reduce harmonic distortion, and at present it is not possible to
improve the performance of speakers.
Therefore, an object of the present invention is to provide a low-distortion, high-performance
speaker that can be thinned.
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[0011]
And in order to achieve this object, according to the present invention, a magnetic circuit having
a magnetic gap is provided on the back of the central portion, and a protector whose outer
peripheral portion is coupled to the frame, and at least in the magnetic gap of the magnetic
circuit. A voice coil body in which a coil portion is movably provided, and an outer peripheral
portion of the voice coil body connected to an outer peripheral portion of the magnetic gap, and
an outer peripheral portion connected to the frame via a first edge A plate and a suspension
holder substantially supporting the voice coil body on the side opposite to the magnetic circuit
side from the diaphragm and having an outer peripheral portion connected to the frame via a
second edge; One edge is coupled to the frame at a position above the magnetic circuit side with
respect to the diaphragm inner circumferential connection portion of the voice coil body, and the
first and second edges are One, is obtained by a substantially symmetrical shape similar to the
second edge boundary.
[0012]
As described above, according to the present invention, a magnetic circuit having a magnetic gap
is installed on the back of the central portion of the protector, the inner peripheral portion of the
diaphragm is connected to the magnetic gap outer portion of the voice coil body, and the outer
peripheral portion of the diaphragm is By connecting to the frame via the first edge at a position
above the magnetic circuit side, the overall thickness of the speaker can be reduced.
[0013]
Also, by configuring the suspension with the first edge and the second edge, the damper that
causes the non-linearity and asymmetry of the suspension is eliminated, and the first edge and
the second edge are their own By arranging to cancel the asymmetry, it is possible to
fundamentally solve the non-linearity and the asymmetry of the suspension, thereby reducing the
harmonic distortion and the power linearity of the loudspeaker to improve the loudspeaker
performance. Can be improved.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0015]
First Embodiment FIG. 1 shows a cross-sectional view of a loudspeaker according to a first
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embodiment of the present invention.
In FIG. 1, the magnetic circuit 11 comprises a disk-shaped magnet 11a, a disk-shaped plate 11b,
and a circular concave yoke 11c, and a magnetic gap 17 between the outer periphery of the plate
11b and the inner periphery of the outer peripheral end of the yoke 11c. The magnetic flux of
the magnet 11a is concentrated.
A neodymium-based or rare earth-cobalt-based material is used as the magnet 11a, and iron is
used as the main material for the plate 11b and the yoke 11c.
Although FIG. 1 shows an example of the inner magnet type, it may be an outer magnet type
magnetic circuit.
The magnetic circuit 11 is attached to the back of the central portion of the protector 18 using a
screw 21, and the outer peripheral portion of the protector 18 is coupled to the frame 19.
[0016]
The voice coil body 12 has a cylindrical shape, and at least the coil portion 12a is movably
provided in the magnetic gap 17 of the magnetic circuit 11. Generally, a bobbin made of paper,
resin, metal such as aluminum is used. The coil such as a copper wire is wound on top of the
structure. A dust cap 20 is provided on the end face of the voice coil body 12 opposite to the coil
portion 12a.
[0017]
The diaphragm 13 is connected to the outer periphery of the magnetic gap 17 of the voice coil
body 12 so that the inner periphery thereof is in the shape of an inverted cone, so that sound is
actually produced by the vibration generated by the voice coil body 12 Therefore, pipes and
resins with high rigidity and internal loss are used as main materials. The diaphragm 13 is
provided such that an outer peripheral portion of an inverted conical shape comes to the
magnetic circuit 11 side, and the outer peripheral portion of the diaphragm 13 is coupled to the
frame 19 via a ring-shaped first edge 14. At this time, the first edge 14 is coupled to the frame
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19 at a position above the magnetic circuit 11 side with respect to the diaphragm 13 inner
circumferential connection portion of the voice coil body 12.
[0018]
By setting the magnetic circuit 11 and the diaphragm 13 in such a position configuration, the
overall thickness of the speaker can be significantly reduced.
[0019]
The first edge 14 is made of a material such as urethane, rubber, or cloth so as not to apply a
movable load to the diaphragm 13, and the frame 19 has a dish-like shape, and this complicated
shape can be accommodated. As such, materials such as iron plate pressed products, resin
molded products, and aluminum die casts are used.
[0020]
The suspension holder 15 is provided on the diaphragm 13 on the opposite side to the magnetic
circuit 11 side, and the inner peripheral portion thereof is on the opposite side to the magnetic
circuit 11 side than the inner peripheral connection portion of the diaphragm 13 of the voice coil
body 12 Pulp and resin, which are connected and compatible with high rigidity and internal loss,
are mainly used.
[0021]
The middle part between the inner circumference and the outer circumference of the suspension
holder 15 is bonded to the middle part of the diaphragm 13 with an adhesive or the like.
For this reason, the phases of the diaphragm 13 and the suspension holder 15 become
substantially the same phase, and it becomes possible to reduce the resonance distortion in the
middle bass region caused by the phase shift of the diaphragm 13 and the suspension holder 15.
The characteristics can be flattened.
[0022]
The outer peripheral portion of the suspension holder 15 is coupled to the frame 19 via the
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second edge 16.
Similar to the first edge 14, the second edge 16 is made of a material such as urethane and
rubber or cloth so as not to apply a movable load to the suspension holder 15.
The second edge 16 is coupled to the frame 19 at an equal or lower position opposite to the
magnetic circuit 11 side than the diaphragm 13 inner circumferential connection portion of the
voice coil body 12.
[0023]
Here, the first edge 14 protrudes to the magnetic circuit 11 side, and the second edge 16
protrudes to the opposite side to the magnetic circuit 11 side, and the boundary between the first
and second edges 14 and 16 Thus, they have substantially symmetrical similar shapes.
[0024]
Next, the top view of the protector 18 of FIG. 2 is shown.
The protector 18 is made of a material such as an iron plate pressed product, a resin molded
product, or an aluminum die cast so as to correspond to a complicated shape. Then, in order to
emit sound to the protector 18 side, the speaker is provided with punching holes 22 on the
entire surface except for the portion of the magnetic circuit 11 attached with a screw 21 on the
back of the central portion. The four corners of the protector 18 are provided with mounting
holes 23 for mounting the speaker together with a frame 19 to which the protector 18 is
attached.
[0025]
FIG. 3 shows a top view of the protector 18a of another embodiment. Similarly, in order to
radiate the sound to the protector 18a side, the opening 25 is provided on the entire surface
except for the four beams 24 for supporting the magnetic circuit 11 attached to the back of the
central portion with the screw 21. It is.
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[0026]
Next, FIG. 4 shows an enlarged cross-sectional view of the connection portion between the
second edge 16 and the suspension holder 15. The connection portion of the second edge 16 to
the suspension holder 15 is connected by the planar overlapping portion 15b, so that the stress
applied to the connection portion can be dispersed, and the input resistance performance of the
speaker can be further improved. .
[0027]
Further, a suspension of the suspension holder 15 and the second edge 16 is provided between
the voice coil body 12 and the frame 19 in place of the conventional damper. The suspension
holder 15 and the second edge 16 constitute a suspension together with the first edge 14 and
are provided so that the voice coil body 12 does not roll when moving.
[0028]
Therefore, the suspension can be configured by the first edge 14 and the second edge 16, and
the damper that causes the non-linearity and the asymmetry of the suspension can be eliminated.
Also, the first edge 14 and the second edge 16 have a substantially symmetrical similar shape so
as to cancel their own asymmetry. Specifically, the first edge 14 and the second edge 16 are
disposed opposite to each other so that the projecting directions are opposite to each other,
whereby the input power-diaphragm amplitude of the power linearity shown by A and B in FIG.
As the characteristics, it is possible to fundamentally solve the non-linearity and asymmetry of
the suspension.
[0029]
Therefore, as in the harmonic distortion characteristics of the speaker shown by D and E in FIG.
6, the harmonic distortion due to the non-linearity and the asymmetry of the suspension can be
reduced, and the performance of the loudspeaker can be improved.
[0030]
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FIG. 5 is a characteristic diagram showing the power linearity of the speaker according to the
first embodiment of the present invention, and shows the amount of amplitude of diaphragm 13
with respect to the input power.
A is the input power-vibration plate amplitude characteristic to the magnetic circuit 11 side.
Further, B is an input power-vibration plate amplitude characteristic on the opposite side to the
magnetic circuit 11.
[0031]
FIG. 6 is a harmonic distortion characteristic of the speaker according to the first embodiment of
the present invention, and shows that the larger the dynamic range of the output sound pressure
and the harmonic distortion, the smaller the harmonic distortion. C is a speaker characteristic, D
is a second harmonic distortion characteristic, and E is a third harmonic distortion characteristic.
[0032]
The operation of the loudspeaker according to Embodiment 1 configured as described above will
be described below.
[0033]
By inputting an electric signal output from an audio amplifier or the like to the coil portion 12a
of the voice coil body 12, the voice coil body 12 is oscillated, the excitation force is transmitted
to the diaphragm 13, and the diaphragm 13 is air. Vibrate to convert the electrical signal to
speech.
[0034]
Further, a suspension of the suspension holder 15 and the second edge 16 is provided between
the voice coil body 12 and the frame 19 in place of the conventional damper.
The suspension holder 15 and the second edge 16 constitute a suspension together with the first
edge 14 and are provided so that the voice coil body 12 does not roll when moving.
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[0035]
Therefore, the suspension can be configured by the first edge 14 and the second edge 16, and
the damper that causes the non-linearity and the asymmetry of the suspension can be eliminated.
Also, the first edge 14 and the second edge 16 have a substantially symmetrical similar shape so
as to cancel their own asymmetry. Specifically, the first edge 14 and the second edge 16 are
disposed opposite to each other so that the projecting directions are opposite to each other,
whereby the input power-diaphragm amplitude of the power linearity shown by A and B in FIG.
As the characteristics, it is possible to fundamentally solve the non-linearity and asymmetry of
the suspension.
[0036]
Therefore, as in the harmonic distortion characteristics of the speaker shown by D and E in FIG.
6, the harmonic distortion due to the non-linearity and the asymmetry of the suspension can be
reduced, and the performance of the loudspeaker can be improved.
[0037]
Second Embodiment Next, FIG. 7 will be described.
FIG. 7 shows a cross-sectional view of the second embodiment, and the same reference numerals
are given to components having the same structure as the first embodiment. In FIG. 7, the
suspension holder 26 has an arc shape, and the inner periphery thereof is connected to a lower
position on the opposite side of the magnetic circuit 11 side than the diaphragm 13 inner
periphery connecting portion of the voice coil body 12 The outer periphery is connected to the
frame 19 via the second edge 16. Thereby, the thickness of the whole speaker can be made thin.
Further, by configuring the suspension with the first edge 14 and the second edge 16, the
damper that causes the non-linearity and asymmetry of the suspension is eliminated, and the first
edge 14, the second edge 16 and Since the diaphragm 13 and the suspension holder 26 are
arranged to cancel their asymmetry, in addition to fundamentally solving the non-linearity and
the asymmetry of the suspension, the suspension holder 26 is By making the shape substantially
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symmetrical and similar, it is possible to improve the performance of the speaker by reducing the
harmonic distortion of the speaker and improving the power linearity and the flatness of the
frequency characteristic of the mid-low range.
[0038]
Third Embodiment Next, FIG. 8 will be described. FIG. 8 shows a cross-sectional view of the third
embodiment, and the same reference numerals are given to components having the same
configuration as the first embodiment. In FIG. 8, the suspension holder 27 has a frusto-conical
shape in which the inner periphery is connected by the planar overlapping portion 27 a in the
middle between the inner periphery and the outer periphery of the diaphragm 13. Are connected
to the frame 19 via As a result, the weight of the suspension holder 27 can be significantly
reduced along with the effects described in the second embodiment, and the acoustic conversion
efficiency of the speaker itself can be improved.
[0039]
Fourth Embodiment Next, FIG. 9 will be described. FIG. 9 shows a cross sectional view of the
fourth embodiment, and the same reference numerals are given to the same configuration as the
first embodiment. In FIG. 9, the first edge 28 has a shape projecting toward the opposite side to
the magnetic circuit 11, and the second edge 29 has a shape projecting toward the diaphragm
13.
[0040]
Therefore, the thickness of the entire speaker can be further reduced since the contact to the
bottom of the frame 19 close to the protector 18 close to the front of the first edge 28 and the
second edge 29 can be avoided. Can. In addition, when the thickness of the entire speaker is not
changed, the maximum sound pressure can be increased by increasing the amplitude margin of
the speaker.
[0041]
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11
Fifth Embodiment Next, FIG. 10 will be described. FIG. 10 shows a cross-sectional view of the
fifth embodiment, and the same reference numerals are given to components having the same
configuration as the second embodiment. In FIG. 10, the first edge 28 has a shape projecting
toward the side opposite to the magnetic circuit 11, and the second edge 29 has a shape
projecting toward the diaphragm 13.
[0042]
Therefore, as in the fourth embodiment, since the protector 18 in front of the first edge 28 and
the bottom surface of the frame 19 in proximity to the second edge 29 can be avoided, the
speaker The overall thickness can be further reduced. In addition, when the thickness of the
entire speaker is not changed, the maximum sound pressure can be increased by increasing the
amplitude margin of the speaker.
[0043]
Sixth Embodiment Next, FIG. 11 will be described. FIG. 11 shows a cross-sectional view of the
sixth embodiment, and the same reference numerals are given to components having the same
configuration as the third embodiment. In FIG. 11, the first edge 28 has a shape projecting
toward the opposite side to the magnetic circuit 11, and the second edge 29 has a shape
projecting toward the diaphragm 13.
[0044]
Therefore, as in the fourth embodiment, since the protector 18 in front of the first edge 28 and
the bottom surface of the frame 19 in proximity to the second edge 29 can be avoided, the
speaker The overall thickness can be further reduced. In addition, when the thickness of the
entire speaker is not changed, the maximum sound pressure can be increased by increasing the
amplitude margin of the speaker.
[0045]
As described above, according to the present invention, the thickness of the speaker can be
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reduced by installing the magnetic circuit having the magnetic gap on the back of the central
portion of the protector and providing the inverted conical diaphragm on the magnetic circuit
side. Also, by configuring the suspension with the first edge and the second edge, the damper
which causes the non-linearity and asymmetry of the suspension is eliminated, and the first edge
and the second edge are their own asymmetry. It is arranged to cancel the stiffness, so it is
possible to fundamentally solve the non-linearity and asymmetry of the suspension, thereby
reducing the harmonic distortion and the power linearity of the loudspeaker resulting in the
loudspeaker performance. It can be improved.
[0046]
Sectional view of the speaker according to the first embodiment of the present invention Top
view of the protector of the speaker according to the first embodiment of the present invention
Top view of the protector according to another example of the speaker according to the first
embodiment of the present invention An enlarged sectional view of a connection portion between
a second edge of the speaker of the form 1 and the suspension holder A characteristic diagram
showing power linearity of the speaker of the embodiment 1 of the present invention A harmonic
distortion characteristic of the speaker of the embodiment 1 of the present invention The crosssectional view of the speaker of the second embodiment of the present invention The crosssectional view of the speaker of the third embodiment of the present invention The crosssectional view of the speaker of the fourth embodiment of the present invention of the
loudspeaker of the fifth embodiment Cross-sectional view Cross-sectional view of the
loudspeaker according to the sixth embodiment of the present invention Cross-sectional view of
the conventional loudspeaker Characteristic diagram showing power linearity of the conventional
loudspeaker Characteristic showing harmonic distortion characteristic of the conventional
loudspeaker
[0047]
REFERENCE SIGNS LIST 11 magnetic circuit 12 voice coil body 13 diaphragm 14, 28 first edge
15, 26, 27 suspension holder 16, 29 second edge 17 magnetic gap 18 protector 19 frame 20
dust cap 21 screw 22 punching hole 23 mounting hole 24 Beam 25 opening
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