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DESCRIPTION JP2004007331

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DESCRIPTION JP2004007331
An object of the present invention is to improve the performance of a speaker. In order to
achieve this object, according to the present invention, the inner periphery of a suspension
holder 20 is connected to the magnetic circuit 9 side of a diaphragm 17 of a voice coil body 15,
and the outer peripheral portion of the suspension holder 20 is a second. The first and second
edges 18 and 21 are connected to the frame 19 through the edge 21 and have substantially
symmetrical similar shapes with the first and second edges 18 and 21 at the boundary, and The
edge 21 and the outer peripheral portion of the suspension holder 20 are connected by a planar
overlapping portion 20A, and the diaphragm 17 and the suspension holder 20 are connected
together at their middle portions. [Selected figure] Figure 1
スピーカ
TECHNICAL FIELD [0001] The present invention relates to a speaker. [0002] A conventional
speaker is configured as shown in FIG. That is, as shown in FIG. 22, the speaker includes a
magnetic circuit 1 and 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. At the outer portion of the magnetic gap 2 of the
voice coil body 4, a diaphragm 5 whose inner periphery is connected, and a frame 7 where the
outer periphery of the diaphragm 5 is connected via the edge 6 It was That is, when an electric
signal output from an audio amplifier or the like is input to voice coil portion 3 of voice coil body
4, voice coil body 4 is oscillated, and the exciting force is transmitted to diaphragm 5. The
diaphragm 5 vibrates air to convert an electrical signal into sound. In the above-described
conventional example, as shown in FIG. 22, the inside of the damper 8 is located between the
voice coil portion 3 of the voice coil body 4 and the inner peripheral fixed portion of the
diaphragm 5. The circumference is fixed, and the outer circumference of the damper 8 is fixed to
the frame 7. The damper 8 constitutes a suspension together with the edge 6 to prevent the
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voice coil body 4 from rolling when moving. Further, as shown in FIG. 22, the damper 8 has a
configuration in which a plurality of waveforms are combined, and is configured not to be as
movable load of the voice coil body 4 as possible. However, in the performance enhancement of
the speaker in recent years, the existence of the damper 8 causes a big problem. That is, the nonlinearity and the asymmetry of the movable load of the damper 8 are large 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, and the harmonics resulting therefrom At the same time as distortion occurs,
power linearity is also degraded. FIG. 23 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. 24 shows harmonic distortion characteristics of the conventional
speaker, where C is a frequency characteristic of the speaker, D is a second harmonic distortion
characteristic, and E is a third harmonic distortion characteristic. In order to solve the problems
of power linearity deterioration and harmonic distortion characteristics caused by such nonlinearity and asymmetry, all companies have various devices 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, it is possible to combine
the damper 8 and the edge 6 to form a suspension, It is difficult to reduce harmonic distortion by
solving nonlinearity and asymmetry, and at present it is not possible to improve the performance
of speakers.
Therefore, the present invention aims to improve the performance of the speaker. In order to
achieve the object, the invention according to claim 1 of the present invention is a magnetic
circuit having a magnetic gap, and the magnetic circuit in the magnetic gap of the magnetic
circuit. A voice coil body at least the coil portion of which is movably provided, a diaphragm
whose inner periphery is connected to an outer portion of the magnetic gap of the voice coil
body, and an outer periphery of the diaphragm has a first edge And an inner periphery of the
suspension holder is connected to the magnetic circuit side of the voice coil body from the
diaphragm of the voice coil body, and an outer peripheral portion of the suspension holder is
connected to the frame via the second edge. And the first and second edges have substantially
symmetrical similar shapes bordering on the first and second edges, and the second edge and the
suspension The outer peripheral portion of the holder is connected by flat polymerization unit,
and the suspension holder and the diaphragm, it is obtained by binding at its middle to each
other. That is, 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. Can be fundamentally solved for suspension nonlinearity and asymmetry, thereby improving speaker performance by reducing harmonic
distortion and power linearity of the speaker. It can be done. Further, by connecting the
diaphragm and the suspension holder in their middle portions, the phases of the both can be
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matched, and the frequency characteristic of the mid-low range can be flattened. Furthermore,
since the stress applied to the connecting portion can be dispersed to the suspension holder by
bending the connecting portion of the second edge with the suspension holder, the input
resistance performance of the speaker can be improved. . Next, according to the eighteenth
aspect of the present invention, there is provided a magnetic circuit having a magnetic gap, and a
voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of
the magnetic circuit. A suspension whose inner peripheral portion is connected to the magnetic
gap outer portion of the voice coil body, a frame whose outer peripheral portion of the
suspension is connected via the second edge, and an inner peripheral portion of the suspension
holder And a diaphragm connected to the frame through a first edge, wherein the first and
second edges are substantially symmetrical similar to each other at the boundary between the
first and second edges. While making it a shape, the 2nd edge and the outer peripheral part of
the said suspension holder are connected by the planar superposition part.
That is, by configuring the suspension with the first edge and the second edge, the damper which
causes the non-linearity and the asymmetry of the suspension is eliminated, and the first edge
and the second edge are themselves By arranging so as to cancel the asymmetry of the speaker,
it is possible to fundamentally solve the non-linearity and the asymmetry of the suspension, and
to reduce the harmonic distortion and the power linearity of the speaker resulting from this.
Performance can be improved. Further, since the inner periphery of the diaphragm is connected
to the middle part of the suspension holder, the input stroke performance can be improved by
making the amplitude stroke of the suspension holder and the magnetic circuit large. The
invention according to claim 35 of the present invention is a magnetic circuit having a magnetic
gap, and a voice coil body in which at least a coil portion thereof is movably provided in the
magnetic gap of the magnetic circuit. The voice coil body has a diaphragm in which the inner
periphery is connected to the outer side of the magnetic gap, and a frame in which the outer
periphery of the diaphragm is connected via the first edge, and the middle portion of the
diaphragm The inner periphery of the suspension holder is connected, and the outer peripheral
portion of the suspension holder is connected to the frame via the second edge, and the first and
second edges form a boundary between the first and second edges. The second edge and the
outer peripheral portion of the suspension holder are connected by a planar overlapping portion.
That is, 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. Because it is arranged so as to cancel out, it is possible
to fundamentally solve the non-linearity and asymmetry of the suspension, and to reduce the
harmonic distortion and the power linearity of the speaker resulting from this. Performance can
be improved. In addition, by connecting the inner periphery of the suspension to the middle part
of the diaphragm, the sound conversion efficiency can be increased by reducing the weight of the
vibration system. The invention according to claim 52 of the present invention is a magnetic
circuit having a magnetic gap, and a voice coil body in which at least a coil portion thereof is
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movably provided in the magnetic gap of the magnetic circuit. The voice coil body is provided
with a diaphragm having an inner peripheral portion connected to the magnetic gap outer
portion, and a frame having an outer periphery of the diaphragm connected via a first edge, and
the voice coil body The inner periphery of the suspension holder is connected to the magnetic
circuit side from the diaphragm, and the outer peripheral portion of the suspension holder is
connected to the frame via a second edge, and the first and second edges are respectively Since
the second edge and the outer peripheral portion of the suspension holder are connected by a
planar overlapping portion, the second edge and the outer periphery of the suspension holder
are connected to each other to cancel the non-linearity. As the first edge and the second edge
cancel their own asymmetry as well as eliminating the damper that causes the non-linearity and
asymmetry of the suspension, the non-linearity and the asymmetry of the suspension It can be
fundamentally solved, and the harmonic distortion reduction and power linearity of the speaker
resulting from this can be improved, and the performance of the speaker can be improved.
Next, according to the inventions of claims 2, 19 and 36 of the present invention, in the outer
peripheral portion of the suspension holder, the suspension holder and the second edge are
connected by a planar overlapping portion in an L shape. As a result, since the effect of
dispersing the stress applied to the connection portion between the suspension holder and the
second edge is increased, the input resistance performance of the speaker can be further
improved. Next, inventions according to claims 3, 20, and 37 of the present invention are
obtained by bending the tip of the outer peripheral portion of the suspension holder, whereby
the inventions according to claims 2, 19, and 36 can be obtained. Also, the effect of dispersing
the stress applied to the connection portion is further increased, so the input resistance
performance of the speaker can be further improved. Next, inventions according to claims 4, 21
and 38 of the present invention are obtained by bending the tip of the outer peripheral portion of
the diaphragm, whereby the connecting portion between the diaphragm and the first edge is
applied. Since the stress can be dispersed, the input resistance performance of the speaker can be
further improved. Next, inventions according to claims 5, 22 and 39 of the present invention are
those in which the diaphragm is provided with corrugations, whereby the rigidity of the
diaphragm is improved, so the input resistance performance of the speaker can be further
improved. It can be improved. Next, inventions according to claims 6, 23, 40 of the present
invention are those in which the bobbin of the voice coil body and the suspension holder are
formed of a metal material, and the heat generation of the voice coil body is detected by the
bobbin The heat can be efficiently dissipated to the space via the suspension holder, and the
input resistance performance of the speaker can be improved. Next, in the invention according to
claims 7, 24 and 41 of the present invention, the first edge is shaped to project in the direction
opposite to the magnetic circuit, and the second edge projects to the magnetic circuit. Even when
the positional relationship between the first edge and the second edge is close, the movable
contact between the first edge and the second edge can be avoided. The maximum sound
pressure can be increased by increasing the speaker's amplitude margin. Next, in the invention
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according to claims 8, 25 and 42 of the present invention, the first edge has a shape projecting
toward the magnetic circuit, and the second edge has a shape projecting toward the diaphragm.
It is possible to avoid contact between the first edge and the acoustic net even in the case where
an acoustic opening such as a net is in front of the first edge, so that the speaker has a large
amplitude margin. By taking it, the maximum sound pressure can be increased.
Next, in the invention according to claims 9, 26, 43 of the present invention, elastic moduli of the
first edge and the second edge are set to be substantially equal, and The second edge can
accurately cancel its own non-linearity, and can greatly improve suspension asymmetry, thereby
reducing harmonic distortion and power linearity of the speaker device. It can be done. Next,
inventions according to claims 10, 27 and 44 of the present invention are those in which the first
edge and the second edge are formed of urethane, and in which the present invention has a first
and a second edge. Also in the speaker of the invention, the increase in weight of the vibration
system can be suppressed to a low level, and the decrease in efficiency of the speaker due to the
increase in weight of the vibration system can be suppressed. Next, according to the inventions of
claims 11, 28, 45 of the present invention, the suspension holder is formed of pulp, and the
increase in the weight of the vibration system is suppressed even in the speaker of the present
invention having the suspension holder. It is possible to suppress the decrease in the efficiency of
the speaker due to the increase in the weight of the vibration system. Next, in the invention
according to claims 12, 29, and 46 of the present invention, the outer peripheral side of the
suspension holder is connected to the frame via the second edge on the magnetic circuit side
than the inner end of the frame. Therefore, the distance between the supporting points of the
first edge and the second edge can be increased, and the voice coil body can be prevented from
rolling when it is movable even without the damper. Next, in the inventions according to claims
13, 30, 47 of the present invention, a dustproof net is attached between the suspension holder
and the magnetic circuit, and dust or the like enters the magnetic gap of the magnetic circuit. Can
be prevented in advance, and the voice coil body can be moved smoothly. Next, in the invention
according to claims 14, 31 and 48 of the present invention, the inner end of the frame is
connected to the magnetic circuit, and a vent is provided on the inner end side of the frame A net
is provided, and dust and the like can be prevented from entering the magnetic gap of the
magnetic circuit in advance, and the voice coil body can be smoothly moved. Next, the invention
according to claims 15, 32, and 49 of the present invention is that the suspension holder is
provided with an opening, and the acoustic output from the suspension holder can be suppressed
to a low level. It is possible to suppress the deterioration of the acoustic characteristics of the
speaker due to the interference of the acoustic output with the diaphragm.
According to the sixteenth, thirty-third, and fifty-fifth aspects of the present invention, an
opening is provided in a portion between the first and second edges of the frame. The
intermediate chamber is prevented from being formed by the edge, the frame, the second edge,
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the suspension holder, and the voice coil body, and by forming the intermediate chamber, the
acoustic output of the suspension holder interferes with the diaphragm to degrade the acoustic
characteristics of the speaker It is possible to suppress Next, according to the inventions of
claims 17, 34 and 51 of the present invention, when the speaker is placed in a relatively smallvolume closed box, the elastic modulus of the second edge from the first edge is The first edge
and the second edge can accurately cancel their own non-linearity even when used in a relatively
small volume sealed box, which is largely set. It is possible to greatly improve the asymmetry of
the suspension and to reduce the harmonic distortion and the power linearity of the speaker
device resulting therefrom. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter,
embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG. 1 (a) shows a cross-sectional view of a loudspeaker according to Embodiment
1 of the present invention, and in FIG. 1 (a), 9 is a ring-shaped magnet 10 and a ring-shaped plate
11 A magnetic circuit having a disk-shaped yoke 12 and a cylindrical pole 13 concentrates the
magnetic flux of the magnet 10 in the magnetic gap 14 between the inner periphery of the plate
11 and the outer periphery of the pole 13. Ferrite-based or rare earth-cobalt-based is used as the
magnet 10, and iron is used as the main material of the plate 11, the yoke 12, and the pole 13.
Although FIG. 1 shows an example of the external magnet type, an internal magnetic type
magnetic circuit is also widely used. Reference numeral 15 is a cylindrical voice coil body in
which at least the coil portion 16 is movably provided in the magnetic gap 14 of the magnetic
circuit 9, and generally a bobbin made of paper, metal, metal such as aluminum, etc. A coil of
copper wire or the like is wound on the top. Reference numeral 17 denotes an inverted conical
diaphragm whose inner periphery is connected to the outer portion of the magnetic gap of the
voice coil body 15 and which actually produces sound by the vibration generated by the voice
coil body 15. Pulp and resin, which have both high rigidity and internal loss, are mainly used.
Reference numeral 18 denotes a ring-shaped first edge coupled to the outer periphery of the
diaphragm 17, and a material such as urethane, rubber, or cloth is used so as not to apply a
movable load to the diaphragm 17.
Numeral 19 is a dish-like frame in which the outer periphery of the diaphragm 17 is connected
via the first edge 18, and materials such as iron plate pressed products, resin molded products,
and aluminum die casting are available to cope with complicated shapes. Used. Reference
numeral 20 denotes a suspension holder in which the inner periphery is connected to the
magnetic circuit 9 side of the diaphragm 17 of the voice coil body 15, and pulp and resin having
high rigidity and internal loss are used as main materials. A middle part between the inner
circumference and the outer circumference of the suspension holder 20 is bonded to the middle
part of the diaphragm 17 with an adhesive or the like. For this reason, the phases of the
diaphragm 17 and the suspension holder 20 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 17 and the suspension holder 20. The characteristics can be
flattened. Reference numeral 21 denotes a second edge for connecting the outer periphery of the
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suspension holder 20 to the frame 19 and, like the first edge 18, a material such as urethane,
rubber, cloth or the like so as not to apply a movable load to the suspension holder 20 Is used.
The first edge 18 projects in the opposite direction to the magnetic circuit 9 and the second edge
21 projects to the magnetic circuit 9 side. However, the first edge 18 is substantially symmetrical
with respect to the first and second edges 18 and 21. It has a similar shape. Next, FIG. 1 (b)
shows an enlarged view of a connection portion between the second edge 21 and the suspension
holder 20. The connection portion of the second edge 21 to the suspension holder 20 is
connected by the planar overlapping portion 20A, so that the stress applied to the connection
portion can be dispersed, and the input resistance performance of the speaker can be further
improved. . Further, in place of the conventional damper, a suspension having a suspension
holder 20 and a second edge 21 is provided between the voice coil body 15 and the frame 19.
The suspension holder 20 and the second edge 21 constitute a suspension together with the first
edge 18, and are provided so that the voice coil body 15 does not roll when moving. Therefore,
the suspension can be configured by the first edge 18 and the second edge 21, and the damper
that causes the non-linearity and the asymmetry of the suspension can be eliminated. Also, the
first edge 18 and the second edge 21 have a substantially symmetrical similar shape so as to
cancel their own asymmetry.
Specifically, the first edge 18 and the second edge 21 are disposed opposite to each other so that
the protruding directions are opposite to each other, whereby the input power-diaphragm
amplitude of 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. Therefore, as in the
harmonic distortion characteristics of the speaker shown by D and E in FIG. 3, the harmonic
distortion due to the non-linearity and the asymmetry of the suspension can be reduced, and the
performance of the speaker can be improved. realizable. FIG. 2 shows the power linearity of the
loudspeaker according to the first embodiment of the present invention, and shows the amount
of amplitude of the diaphragm 17 with respect to the input power. A is the input power-vibration
plate amplitude characteristic to the magnetic circuit 9 side. B is the input power-vibration plate
amplitude characteristic on the opposite side to the magnetic circuit 9. FIG. 3 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 less the harmonic distortion. C is a speaker characteristic, D is a second
harmonic distortion characteristic, and E is a third harmonic distortion characteristic. The
operation of the loudspeaker according to Embodiment 1 configured as described above will be
described below. By inputting an electric signal output from an audio amplifier or the like to the
coil portion 16 of the voice coil body 15, the voice coil body 15 is oscillated, and the oscillating
force is transmitted to the diaphragm 17, and the diaphragm 17 vibrates the air to convert the
electrical signal into speech. In addition, a suspension having a suspension holder 20 and a
second edge 21 is provided between the voice coil body 15 and the frame 19 in place of the
conventional damper. The suspension holder 20 and the second edge 21 constitute a suspension
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together with the first edge 18, and are provided so that the voice coil body 15 does not roll
when moving. Therefore, the suspension can be configured by the first edge 18 and the second
edge 21, and the damper that causes the non-linearity and the asymmetry of the suspension can
be eliminated. Also, the first edge 18 and the second edge 21 have a substantially symmetrical
similar shape so as to cancel their own asymmetry. Specifically, the first edge 18 and the second
edge 21 are disposed opposite to each other so that the protruding directions are opposite to
each other, whereby the input power-diaphragm amplitude of 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.
Therefore, like the harmonic distortion characteristics of the speaker shown by D and E in FIG. 3,
the harmonic distortion due to the non-linearity and the asymmetry of the suspension can be
reduced, and the performance of the speaker can be improved. realizable. Second Embodiment
Next, FIG. 4 will be described. FIG. 4 shows a cross-sectional view of the second embodiment of
the present invention, and the same reference numerals are given to components having the
same configuration as the first embodiment. In FIG. 4, reference numeral 26 denotes an inverted
truncated conical diaphragm in which the inner periphery is connected to the middle between
the inner periphery and the outer periphery of the suspension holder 25 by the planar
overlapping portion 25A, and the outer periphery is the first edge 18 Are connected to the frame
19 via Therefore, the weight of the diaphragm 26 can be reduced significantly, and the acoustic
conversion efficiency of the speaker itself can be improved. Third Embodiment Next, FIG. 5 will
be described. FIG. 5 shows a cross-sectional view of the third embodiment, and the same
reference numerals are given to the same configuration as the first and second embodiments. In
FIG. 5, reference numeral 27 denotes a frusto-conical suspension holder whose inner periphery is
connected by a planar overlapping portion 27A in the middle between the inner periphery and
outer periphery of the diaphragm 17, and the outer periphery thereof is the second edge 21. It is
connected to the frame 19 via As a result, the weight of the suspension holder 27 can be
significantly reduced, and the acoustic conversion efficiency of the speaker itself can be
improved. Fourth Embodiment Next, FIG. 6 will be described. FIG. 6 shows an enlarged cross
sectional view of a main part of the fourth embodiment. In FIG. 6, the tip of the outer peripheral
portion of the suspension holder 20 is connected to the suspension holder 20 and the second
edge 21 by an L-shaped planar overlapping portion 20B. As a result, the effect of dispersing the
stress applied to the connection portion between the suspension holder 20 and the second edge
21 is increased, so that the input resistance performance of the speaker can be further improved.
Fifth Embodiment Next, FIG. 7 will be described. FIG. 7 shows an enlarged sectional view of a
main part of the fifth embodiment. In FIG. 7, the tip of the outer peripheral portion of the
suspension holder 20 is formed by connecting the suspension holder 20 and the second edge 21
by an L-shaped planar overlapping portion 20B and extending the suspension holder 20 while
bending it. As a result, the effect of dispersing the stress applied to the connection portion
between the suspension holder 20 and the second edge 21 is further enhanced, so that the input
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resistance performance of the speaker can be further improved.
Sixth Embodiment Next, FIG. 8 will be described. FIG. 8 shows an enlarged sectional view of a
main part of the sixth embodiment. In FIG. 8, the tip of the outer peripheral portion of the
diaphragm 17 is extended while being bent in an L shape. As a result, the connecting portion
between the diaphragm 17 and the first edge 18 is strengthened, and the stress applied to the
connecting portion can be dispersed, so that the input resistance performance of the speaker can
be further improved. Seventh Embodiment Next, FIG. 9 will be described. FIG. 9 shows a crosssectional view of the seventh embodiment, and the same reference numerals are given to
components having the same configuration as the first to sixth embodiments. In FIG. 9, a
corrugation is provided in a portion between the middle of the diaphragm 17 and the first edge
18. Thereby, the rigidity of the diaphragm 17 is improved, so that the input resistance
performance of the speaker can be further improved. Eighth Embodiment Next, FIG. 10 will be
described. FIG. 10 shows a cross-sectional view of the eighth embodiment, and the same
reference numerals are given to components having the same configuration as the first to
seventh embodiments. In FIG. 10, the suspension holder 20 and the bobbin of the voice coil body
15 are made of a metal material having high thermal conductivity. Therefore, the heat generation
of the voice coil body 15 can be efficiently dissipated to the space through the bobbin of the
voice coil body 15 and the suspension holder 20, and the temperature rise of the voice coil body
15 can be suppressed. For this reason, even if it is an adhesive whose adhesive strength is
lowered at high temperature, the adhesive strength of the voice coil body 15, the diaphragm 17
and the suspension holder 20 can be sufficiently ensured, so the input resistance performance of
the speaker is improved. be able to. Embodiment 9 Next, FIG. 11 will be described. FIG. 11 shows
a cross-sectional view of the ninth embodiment, and the same reference numerals are given to
components having the same configuration as the first to eighth embodiments. In FIG. 11, the
first edge 18 is shaped to protrude in the opposite direction to the magnetic circuit 9, and the
second edge 21 is shaped to protrude toward the magnetic circuit 9. Therefore, even when the
positional relationship between the first edge 18 and the second edge 21 is close, the movable
contact between the first edge 18 and the second edge 21 can be avoided, The maximum sound
pressure can be increased by increasing the amplitude margin of the speaker. Tenth Embodiment
Next, FIG. 12 will be described.
FIG. 12 shows a cross-sectional view of the tenth embodiment, and the same reference numerals
are given to components having the same structure as the first to ninth embodiments. In FIG. 12,
the first edge 29 has a shape projecting toward the magnetic circuit 9, and the second edge 30
has a shape projecting toward the diaphragm 17. Therefore, even when an acoustic opening such
as a net is close to the front of the first edge 29, the contact between the first edge 29 and the
acoustic net can be avoided. By making it large, the maximum sound pressure can be made large.
Eleventh Embodiment Next, FIG. 13 will be described. FIG. 13 shows a cross-sectional view of the
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eleventh embodiment. In FIG. 13, elastic moduli of the first edge 18 and the second edge 21 are
set substantially equal. As a result, the first edge 18 and the second edge 21 can accurately
cancel their own non-linearity and asymmetry, which largely solves the non-linearity and
asymmetry of the suspension. As a result, harmonic distortion and power linearity of the speaker
device resulting from this can be significantly reduced. Embodiment 12 Next, FIG. 14 will be
described. FIG. 14 shows a cross-sectional view of the twelfth embodiment. In FIG. 14, the first
edge 18 and the second edge 21 are formed of urethane. Therefore, also in the loudspeaker
according to the twelfth embodiment of the present invention having the first and second edges
18 and 21, the increase in the weight of the vibration system can be suppressed to a small
degree, and the efficiency of the speaker decreases due to the increase in the weight of the
vibration system. Can be kept low. Thirteenth Embodiment Next, FIG. 15 will be described. FIG.
15 shows a sectional view of the thirteenth embodiment. In FIG. 15, the suspension holder 20 is
formed of pulp. Therefore, while securing the elastic modulus and the internal loss, it is possible
to suppress the increase in weight of the vibration system to a small amount, and it is possible to
suppress the decrease in efficiency of the speaker accompanying the increase in weight of the
vibration system. Fourteenth Embodiment Next, FIG. 16 will be described. FIG. 16 shows a crosssectional view of the fourteenth embodiment, and the same reference numerals are given to
components having the same structure as the first to thirteenth embodiments. In FIG. 16, the
suspension holder 20 is connected to the frame 19 via the second edge 21 with its outer
peripheral end closer to the magnetic circuit 9 than the inner peripheral end of the frame 19.
Therefore, the distance between the supporting points of the first edge 18 and the second edge
21 can be made as large as possible, and it is possible to prevent the voice coil body 15 from
rolling when moving. . Fifteenth Embodiment FIG. 17 will be described next. FIG. 17 shows a
cross-sectional view of the fifteenth embodiment, and the same reference numerals are given to
components having the same configuration as the first to fourteenth embodiments. In FIG. 17,
the dustproof net 31 is attached between the voice coil body 15 and the frame 19. For this
reason, it is possible to prevent dust and the like from entering the magnetic gap 14 of the
magnetic circuit 9 in advance. Sixteenth Embodiment Referring now to FIG. FIG. 18 shows a rear
view of the speaker according to the sixteenth embodiment, and the same reference numerals are
given to components having the same structure as those in the first to fifteenth embodiments. In
FIG. 18, the inner end of the frame 19 is connected to the magnetic circuit 9, the air vent 32 is
provided on the inner end side (bottom side) of the frame 19, and the dustproof net 33 is
provided at the air vent 32. . For this reason, it is possible to prevent dust and the like from
entering the magnetic gap 14 of the magnetic circuit 9 in advance. Seventeenth Embodiment
Next, FIG. 19 will be described. FIG. 19 shows a partially cutaway front view of the speaker of the
seventeenth embodiment, and the same reference numerals are given to components having the
same configuration as the first embodiment. In FIG. 19, the suspension holder 20 is configured to
have an opening 34. Therefore, the acoustic output of the suspension holder 20 can be
prevented from interfering with the diaphragm 17 to deteriorate the acoustic characteristics of
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the speaker. Eighteenth Embodiment Next, FIG. 20 will be described. FIG. 20 shows a partially
cutaway front view of the eighteenth embodiment of the present invention, and the same
reference numerals are given to components having the same configuration as the first to
seventeenth embodiments. In FIG. 20, an opening 35 is provided between the first edge 18 and
the second edge 21 of the frame 19. Therefore, the intermediate chamber can be prevented from
being formed by the diaphragm 17, the first edge 18, the frame 19, the second edge 21, the
suspension holder 20, and the voice coil body 15. That is, by forming the intermediate chamber,
the acoustic output of the suspension holder 20 can be prevented from interfering with the
diaphragm 17 to deteriorate the acoustic characteristics of the speaker.
Nineteenth Embodiment Finally, FIG. 21 will be described. FIG. 21 shows a cross-sectional view of
the nineteenth embodiment, and the same reference numerals are given to components having
the same configuration as the first to eighteenth embodiments. In FIG. 21, reference numeral 36
denotes a relatively small sealed box to which the loudspeaker according to the first to
eighteenth embodiments of the present invention is attached, wherein the elastic modulus of the
second edge 21 is set larger than that of the first edge 18 . Therefore, even when used in a
relatively small volume sealed box 36, the suspension characteristics are matched by the air
spring and the first edge 18 and the second edge 21, and the non-linearity and the asymmetry
are accurately determined. It is possible to cancel the harmonic distortion of the speaker and to
improve the power linearity. As described above, according to the present invention, in the
speaker, by connecting the outer peripheral portion of the suspension holder with the planar
overlapping portion, the stress applied to the connecting portion is dispersed to the entire
suspension holder. Can. As a result, harmonic distortion of the speaker can be reduced, power
linearity can be improved, and the performance of the speaker can be improved. BRIEF
DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are cross-sectional views of the speaker
according to the first embodiment of the present invention, respectively. FIG. 2 shows the power
linearity of the speaker according to the first embodiment of the present invention. Characteristic
diagram [Fig. 3] A characteristic diagram showing harmonic distortion characteristics of the
speaker according to the first embodiment of the present invention [Fig. 4] A cross-sectional view
of the speaker according to the second embodiment of the present invention [Fig. 6 is a crosssectional view of an essential part of the speaker according to the fourth embodiment of the
present invention. FIG. 7 is an enlarged cross-sectional view of an essential part of the speaker
according to the fifth embodiment of the present invention. Fig. 9 is a cross-sectional view of a
loudspeaker according to a seventh embodiment of the present invention. Fig. 10 is a crosssectional view of a loudspeaker according to an eighth embodiment of the present invention. FIG.
12 is a cross-sectional view of the loudspeaker according to Embodiment 9 of the invention.
Cross-sectional view of a speaker [FIG. 13] Cross-sectional view of a speaker according to
Embodiment 11 of the present invention [FIG. 14] Cross-sectional view of a speaker according to
Embodiment 12 of the present invention [FIG. 16 is a sectional view of the speaker according to
the fourteenth embodiment of the present invention. FIG. 17 is a sectional view of the speaker
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according to the fifteenth embodiment of the present invention. FIG. 18 is a rear view of the
speaker according to the sixteenth embodiment of the present invention. FIG. 19 is a partially
cutaway front view of a loudspeaker according to a seventeenth embodiment of the present
invention. FIG. 20 is a partially cutaway front view of a loudspeaker according to an eighteenth
embodiment of the present invention. 22 is a cross-sectional view of a conventional speaker. FIG.
23 is a characteristic view showing power linearity of a conventional speaker. FIG. 24 is a
characteristic view showing harmonic distortion characteristics of a conventional speaker.
Magnetic circuit 10 Gnett 11 plate 12 yoke 13 pole 14 magnetic gap 15 voice coil body 16 coil
portion 17, 26 diaphragm 18, 29 first edge 19 frame 20, 25, 27 suspension holder 20A, 20B,
25A, 27A planar overlapping portion 21, 30 second edge 31, 33 dustproof net 32 vent 34, 35
opening
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