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JP2004007332

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DESCRIPTION JP2004007332
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 periphery of the suspension holder 20 has a second edge. The first and second
edges 18 and 21 are connected to the frame 19 through 21 and have substantially symmetrical
similar shapes with the first and second edges 18 and 21 at the boundary, and the diaphragm 17
is a speaker in which the suspension holder 20 is coupled to each other at their middle portions,
and a portion between the middle portion of the suspension holder 20 and the second edge 21 is
curved in the outer circumferential direction. [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. 23, 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, by inputting an
electric signal output from an audio amplifier or the like 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. The diaphragm 5 vibrates air to convert an electrical signal into sound. In the
above-described conventional example, as shown in FIG. 23, 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
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the voice coil body 4 from rolling when it is movable. Further, as shown in FIG. 23, the damper 8
has a configuration in which a plurality of waveforms are combined, and is configured not to be a
movable load of the voice coil body 4 as much 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 non-linearity 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. 24 shows the power linearity of the
conventional loudspeaker and the displacement of the diaphragm 5 with respect to the
loudspeaker 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. 25 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 non-linearity 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 a
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 a second edge. The first and second edges are connected in a
substantially symmetrical similar shape with a boundary between the first and second edges, and
the diaphragm and the suspension hole are connected. And its attached at intermediate each
other, in which the portion between the second edge from middle of the suspension holder is
curved toward the outer circumference. 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 non-linearity 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
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phases of the both can be matched, and the frequency characteristic of the mid-low range can be
flattened. Furthermore, the resonance frequency can be dispersed by curving the suspension
holder outward. Next, the invention according to claim 19 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. A suspension holder 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 holder is connected via the second edge, and a
middle portion of the suspension holder An inner periphery is connected, and an outer periphery
is provided with a diaphragm connected to the frame via a first edge, and the first and second
edges are substantially separated by the first and second edges. It has a symmetrical similar
shape, and a portion between the middle portion of the suspension holder and the second edge is
curved outward.
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. Next, the
invention according to claim 37 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 periphery 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 portion between the middle
portion of the suspension holder and the second edge is curved in the outer circumferential
direction. 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. Further, by connecting the inner periphery of the suspension
holder to the middle part of the diaphragm, it is possible to increase the sound conversion
efficiency by reducing the weight of the vibration system. Next, according to the 55th 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
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magnetic circuit. The voice coil body is provided with a diaphragm having an inner periphery
thereof 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
periphery of the suspension holder is connected to the frame via the second edge, and the second
portion between the middle of the suspension holder and the edge The part was curved outward.
Since the first and second edges are related to cancel their non-linearities, they eliminate
dampers that cause suspension non-linearity and asymmetry, and Since the second and third
edges cancel their own asymmetry, the non-linearity and asymmetry of the suspension can be
fundamentally resolved, resulting in reduction of harmonic distortion and power linearity of the
speaker. Can improve the performance of the speaker. Next, the invention according to claims 2,
20 and 38 of the present invention relates to connecting the outer peripheral portion of the
suspension holder to the frame via the second edge, and for the second edge and the suspension
holder. The outer peripheral portion is connected by the planar overlapping portion, and since
the stress applied to the connected portion can be dispersed to the suspension holder, the input
resistance performance of the speaker can be further improved. Next, according to the inventions
of claims 3, 21 and 39 of the present invention, in the outer peripheral portion of the suspension
holder, the suspension holder and the second edge are L-shaped and connected by a planar
overlapping portion, As a result, the effect of dispersing the stress applied to the connection
portion between the suspension holder and the second edge is increased, so that the input
resistance performance of the speaker can be further improved. Next, inventions according to
claims 4, 22 and 40 of the present invention are those in which the tip of the outer peripheral
portion of the suspension holder is bent while being extended, whereby the inventions according
to claims 3 21 and 39 are obtained. Since the effect of dispersing the stress applied to the
connection portion is further enhanced than in the invention, the input resistance performance of
the speaker can be further improved. Next, inventions according to claims 5, 23 and 41 of the
present invention are those in which the tip of the outer peripheral portion of the diaphragm is
bent and extended, whereby the connection portion between the diaphragm and the first edge is
obtained. Because the stress applied to the speaker can be dispersed, the input resistance
performance of the speaker can be further improved. Next, inventions according to claims 6, 24
and 42 of the present invention are those in which the diaphragm is provided with corrugations,
whereby the rigidity of the diaphragm is improved. It can be improved. The inventions according
to claims 7, 25 and 43 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 8, 26, and 44 of the present invention, the first edge is
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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 according to claims 9, 27 and 45 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 inventions according to claims 10, 28, 46 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, the inventions recited in claims 11, 29 and 47 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 first and second edges. 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, the
invention according to claims 12, 30, and 48 of the present invention is one in which the
suspension holder is formed of pulp, and in the speaker of the present invention having the
suspension holder, the increase in vibration system weight is suppressed to a small extent. It is
possible to suppress the decrease in the efficiency of the speaker due to the increase in the
vibration system weight. Next, in the invention according to claims 13, 31 and 49 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 14, 32, and 50 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 15, 33 and 51 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 16, 34 and 52 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. Next, according to the inventions of claims 17, 35 and 53 of the
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present invention, an opening is provided in the portion between the first and second edges of
the frame, and a diaphragm, and The intermediate chamber is prevented from being formed by
the edge, the frame, the second edge, 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 18, 36 and 54 of the present invention, when the
speaker is put in a relatively small-volume 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 nonlinearity 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 shows a cross-sectional view of a
loudspeaker according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 9
denotes a ring-shaped magnet 10, a ring-shaped plate 11, and a disk-shaped yoke 12 is a
magnetic circuit having cylindrical poles 13 and 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 vibration excited 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. The second edge 21 couples the outer periphery of the suspension
holder 20 to the frame 19 and, like the first edge 18, a material such as urethane, rubber or cloth
is used so as not to apply a movable load to the suspension holder 20. . Here, in order to disperse
the stress applied to the connection portion with the second edge 21, the suspension holder 20
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curves a portion between the middle portion and the connection portion with the second edge 21
in the outer peripheral direction. 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. 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. Further, 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. When an electric signal output from an
audio amplifier or the like is input 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 instead of the conventional damper. 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. For this reason, the suspension can be
configured by the first edge 18 and the second edge 21, and the damper that causes the nonlinearity 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 powerdiaphragm 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. 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 whose inner periphery is connected to a middle portion between
the inner periphery and outer periphery of the suspension holder 25, and the outer periphery
thereof is a frame 19 via the first edge 18. Is linked to Here, in order to disperse the stress
applied to the connection portion with the second edge 21, the suspension holder 25 curves the
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portion between the middle portion and the connection portion with the second edge 21 in the
outer peripheral direction.
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 to a middle portion between the inner periphery and outer periphery of the
diaphragm 17, and the outer periphery is attached to the frame 19 through the second edge 21.
It is connected. Here, in order to disperse the stress applied to the connection portion with the
second edge 21, the suspension holder 27 curves a portion between the middle portion and the
connection portion with the second edge 21 in the outer peripheral direction. 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. 6 (a) is a cross-sectional view of the fourth embodiment, and FIG. 6 (b) is an enlarged
view of a connection portion between the second edge 21 and the suspension holder 20. FIG. The
same components as those in the first to third embodiments are given the same reference
numerals. In FIG. 6, in the suspension holder 20, the portion between the middle portion and the
connection portion with the second edge 21 is curved in the outer peripheral direction.
Furthermore, since the second edge 21 and the outer peripheral portion of the suspension holder
20 are connected by the planar overlapping portion 20A, the stress applied to the connected
portion can be dispersed, so that the input resistance performance of the speaker can be further
improved. it can. 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, in the suspension holder 20, the
portion between the middle portion and the connection portion with the second edge 21 is
curved in the outer peripheral direction. Furthermore, in the outer peripheral portion of the
suspension holder 20, the suspension holder 20 and the second edge 21 are connected in an L
shape by a planar overlapping portion 20A. As a result, the effect of dispersing the stress applied
to the connection portion between the suspension holder 25 and the second edge 21 is
increased, so that the input 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 suspension
holder 20 is extended while being bent.
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 resistance
performance of the speaker can be further improved. Seventh Embodiment Next, FIG. 9 will be
described. FIG. 9 shows an enlarged sectional view of a main part of the seventh embodiment. In
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FIG. 9, the tip of the outer peripheral portion of the diaphragm 17 is extended while being bent.
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. 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, 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. 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 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. Tenth Embodiment FIG. 12 will be described next. 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 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.
Eleventh Embodiment Next, FIG. 13 will be described. FIG. 13 shows a sectional view of the
eleventh embodiment, and the same reference numerals as in the first to tenth embodiments
denote the same parts. In FIG. 13, the first edge 18 has a shape projecting toward the magnetic
circuit 9, and the second edge 21 has a shape projecting toward the diaphragm 17. Therefore,
even when an acoustic opening such as a net is in front of the first edge 18, the contact between
the first edge 18 and the acoustic net can be avoided. By making it large, the maximum sound
pressure can be made large. Twelfth Embodiment Next, FIG. 14 will be described. FIG. 14 shows a
cross-sectional view of the twelfth embodiment. In FIG. 14, the 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 resolves 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. Thirteenth
Embodiment FIG. 15 will be described next. FIG. 15 shows a cross-sectional view of the thirteenth
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embodiment. In FIG. 15, the first edge 18 and the second edge 21 are formed of urethane.
Therefore, also in the loudspeaker according to the thirteenth 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 with the
increase in the weight of the vibration system. Can be kept low. Fourteenth Embodiment Next,
FIG. 16 will be described. FIG. 16 shows a sectional view of the fourteenth embodiment, and in
FIG. 16, 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. 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 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 the voice coil body 15 can be prevented from rolling
when moving. . Sixteenth Embodiment Next, FIG. 18 will be described. FIG. 18 shows a crosssectional view of the sixteenth embodiment, and the same reference numerals are given to
components having the same configuration as the first to fifteenth embodiments. In FIG. 18, a
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. Seventeenth Embodiment FIG. 19 will be described next. FIG. 19 shows a rear view
of the loudspeaker according to the seventeenth embodiment, and the same reference numerals
are given to components having the same structure as those in the first to sixteenth
embodiments. In FIG. 19, the inner end of the frame 19 is connected to the magnetic circuit 9,
the vent 32 is provided on the inner end (bottom side) of the frame 19, and the dustproof net 33
is provided at the 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. Eighteenth Embodiment Next,
FIG. 20 will be described. FIG. 20 shows a partially cutaway front view of the speaker of the
eighteenth embodiment, and the same reference numerals are given to components having the
same configuration as the first embodiment. In FIG. 20, an opening 34 is provided in the
suspension holder 20. For this reason, 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 Next, FIG. 21 will be described. FIG. 21 shows a partially
cutaway front view of the nineteenth embodiment of the present invention, and the same
reference numerals are given to components having the same configuration as the first to
eighteenth embodiments. In FIG. 21, an opening 35 is provided in a portion between the first
edge 18 and the second edge 21 of the frame 19. Therefore, the intermediate chamber can be
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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.
Twentieth Embodiment Finally, FIG. 22 will be described. FIG. 22 shows a sectional view of the
twentieth embodiment, and the same reference numerals are given to the same components as
the first to nineteenth embodiments. In FIG. 22, reference numeral 36 denotes a relatively small
sealed box to which the loudspeaker according to the first to nineteenth 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 19. . 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, the stress applied to the
connecting portion is suspended by curving the portion between the middle portion of the
suspension holder and the second edge in the outer peripheral direction. It can be dispersed
throughout the holder. 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 FIG. 1 is a cross-sectional view of the loudspeaker according
to the first embodiment of the present invention. FIG. 2 is a characteristic chart showing power
linearity of the loudspeaker according to the first embodiment of the present invention.
Characteristic chart showing harmonic distortion characteristics of the loudspeaker according to
the embodiment 1. FIG. 4 is a sectional view of the loudspeaker according to the embodiment 2
of the present invention. FIG. 5 is a sectional view of the loudspeaker according to the
embodiment 3 of the invention. (A) and (b) are cross-sectional views of the loudspeaker
according to the fourth embodiment of the present invention, respectively. FIG. 7 is an enlarged
cross-sectional view of main parts of the loudspeaker according to the fifth embodiment of the
present invention. Fig. 9 is an enlarged sectional view of an essential part of the speaker
according to the seventh embodiment of the present invention. Fig. 10 is a sectional view of the
speaker 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. FIG. 16 is a sectional view of the loudspeaker according to the fourteenth
embodiment of the present invention. FIG. 17 is a sectional view of the loudspeaker according to
the fifteenth embodiment of the present invention. FIG. 18 is a sectional view of the loudspeaker
according to the sixteenth embodiment of the present invention. 19 is a rear view of the
loudspeaker according to a seventeenth embodiment of the present invention. FIG. 20 is a
partially cutaway front view of the loudspeaker according to the eighteenth embodiment of the
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present invention. Fig. 22 is a cross-sectional view of a loudspeaker according to a twentieth
embodiment of the present invention. Fig. 23 is a cross-sectional view of a conventional
loudspeaker. Fig. 24 is a characteristic diagram showing power linearity of a conventional
loudspeaker. Speaker harmonic distortion 9: Magnetic circuit 10 Magnet 11 Plate 12 Yoke 13
Pole 14 Magnetic gap 15 Voice coil body 16 Coil part 17, 26 Diaphragm 18, 29 First edge 19
Frame 20 Suspension holder 21, 30 second edge 31, 33 dustproof net 32 vent 34, 35 opening
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