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DESCRIPTION JPH1013988

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH1013988
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
technical field of a speaker device for converting an electrical signal into sound.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 12, a voice coil 107 mounted
on a movably supported diaphragm 105 provided with a magnetic circuit is positioned in the
magnetic gap portion 114 of the magnetic circuit. Speaker devices have been proposed. In this
speaker device, the electric signal supplied to the voice coil 107 is converted into the sound
generated by the vibration of the diaphragm 105.
[0003]
In such a speaker device, the voice coil 107 moves in the magnetic flux in the magnetic gap
portion 114 with the diaphragm 105 by supplying an electric signal, and the diaphragm 105 is
vibrated. Let The driving force for vibrating the diaphragm 105 is F, the magnetic flux density in
the magnetic gap 114 is B, the current flowing through the voice coil 107 is I, and the length of
the wire of the voice coil 107 is L. Then, is established.
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1
[0004]
The magnetic circuit of the speaker device has a yoke 102 which is substantially disk-shaped of
magnetic material and to which an annular drive magnet 103 is attached on the front surface. At
a central portion of the front surface of the yoke 102, a cylindrical center pole portion 101 is
provided so as to be coaxial with the drive magnet 103. On the front surface of the drive magnet
103, a disk-shaped plate 104 having a through hole at the center is attached. The through hole of
the plate 104 and the tip end side portion of the center pole portion 101 face each other to form
the magnetic gap portion 114.
[0005]
Then, a frame 108 supporting the diaphragm 105 is attached to the front surface of the plate
104, whereby a speaker device is configured. The voice coil 107 is attached to the rear surface of
the diaphragm 105 via a cylindrical bobbin 106. The voice coil 107 is located in the magnetic
gap portion 114.
[0006]
In the diaphragm 105, a through hole at a central portion to which the bobbin 106 is attached is
closed by a cap portion 112. Further, the diaphragm 105 is attached to the front end portion of
the frame 108 by a gasket 115 via the edge member 113 on the periphery side. The bobbin 106
is supported by the frame 108 via a damper 109.
[0007]
The lead wire 110 from the voice coil 107 is connected to the terminal portion 111 provided on
the frame 108.
[0008]
As described above, the diaphragm 105 in which the edge member 113 is formed of a cloth
material or the like separately from the diaphragm 105 and the edge member 113 is joined to
the peripheral portion is called a free edge cone. .
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On the other hand, as shown in FIG. 13, a diaphragm 105 integrally formed with an edge portion
105a, which is a bent portion corresponding to the above-mentioned edge member, in the
peripheral portion is called a fixed edge cone. When these free edge cones and fixed edge cones
are compared, the manufacture and assembly of the speaker device are easier with the fixed edge
cone.
[0009]
By the way, in the above-mentioned speaker apparatus, in particular, when it is configured as a
small-sized full-band speaker, a fixed edge cone is used as the diaphragm 105 for facilitating
manufacture and assembly. When adopted, there is a problem that the lowest resonance
frequency of the diaphragm is increased and the reproduction frequency band on the low band
side is narrowed. This is because, in the vibrating plate 105 of the fixed edge cone, the edge
portion 105a is also formed of the same material as the portion which is driven by the voice coil
107 to perform full band reproduction, so this edge portion 105a is a cloth. This is because it is
harder than the edge member 113 formed of a material or the like. In addition, in the speaker
device employing such a fixed-edge-cone diaphragm 105, since the edge portion 105a is rigid,
unnecessary sound is easily emitted.
[0010]
Furthermore, in the speaker device employing the diaphragm 105 of the fixed edge cone, the
allowable portion is smaller than that of the speaker device employing the diaphragm of the free
edge cone because the edge portion 105a is rigid and weak.
[0011]
Therefore, the present invention is proposed in view of the above-mentioned situation, and the
minimum resonance frequency is sufficiently lowered without causing the enlargement and
complication of the device configuration, and the reproduction characteristic of the low
frequency band is obtained. Speaker apparatus which is free from deterioration of the sound
quality and the reduction of the sound pressure level of the reproduced sound, and in which the
allowable input is made sufficiently large and the sound reproduction in the entire band
including the low frequency band can be performed well. To solve the problem of providing
[0012]
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SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speaker
device according to the present invention is provided with a magnetic circuit having a magnetic
gap portion and a coil bobbin provided with a voice coil, and the voice coil is used as the
magnetic coil. And a diaphragm supported so as to be movable in a state of being positioned in
the gap portion, wherein the diaphragm is configured by bonding at least two layers of a front
surface layer and a rear surface layer having different internal losses. It is
[0013]
Further, according to the present invention, in the above speaker device, at least one layer of the
plurality of layers constituting the diaphragm is formed of a heat melting material, and this layer
has a smaller internal loss than the other layers. It is what is being done.
[0014]
The speaker device according to the present invention includes a magnetic circuit having a
magnetic gap portion, a coil bobbin provided with a voice coil, and a vibration supported
movably in a state where the voice coil is positioned in the magnetic gap portion. And the
diaphragm is configured by joining a plurality of layers, and at least one of the layers is formed
of a foam material or a material including a hollow material. .
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0016]
The speaker device according to the present invention, as shown in FIG. 1, is configured to have a
magnetic circuit and a frame 8 supported on the magnetic circuit.
[0017]
The magnetic circuit has a disk-shaped yoke 2 made of a magnetic material, and an annular
magnet 3 fixed to the front surface of the yoke 2.
The magnet 3 is magnetized so as to generate a magnetic flux in the thickness direction, that is,
so that the front surface portion and the rear surface portion become magnetic poles.
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At the center of the front surface of the yoke 2, a cylindrical center pole portion 1 is integrally
protruded.
The magnet 3 is coaxial with the center pole portion 1.
The center pole portion 1 is inserted into the central through hole of the magnet 3.
[0018]
Attached to the front surface of the magnet 3 is a top plate 4 which is formed of a magnetic
material and has a through hole at its central portion.
The tip end side portion of the center pole portion 1 is inserted into the through hole in the
central portion of the top plate 4.
[0019]
That is, when the top plate 4 is attached to the magnet 3, a gap guide is inserted between the
outer peripheral surface of the center pole portion 1 and the inner peripheral surface of the
through hole at the central portion of the top plate 4. The top plate 4 is adhered to the magnet 3
with the plate 4 positioned relative to the center pole 1.
Then, after the adhesive for bonding the top plate 4 to the magnet 3 is solidified, the top plate 4
is positioned with respect to the center pole portion 1 by removing the gap guide. It is fixed.
[0020]
The magnetic gap portion 14 is formed such that the inner circumferential surface portion of the
through hole at the central portion of the top plate 4 and the outer circumferential surface
portion of the middle portion of the center pole portion 1 face each other.
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[0021]
The frame 8 is made of a material having sufficient rigidity such as metal, and is formed in a
cylindrical shape whose front end side is expanded in a substantially conical shape, and its rear
end side portion is fixed to the front surface portion of the top plate 4 .
[0022]
A peripheral portion of the diaphragm 5 is attached to the holding portion on the front end side
of the frame 8 by a gasket 15.
The gasket 15 is formed by annularly winding a strip of paper coated with an adhesive.
[0023]
The diaphragm 5 is configured by bonding two layers of a surface layer 5a and a back layer 5b.
The surface layer 5a is made of a material that is hard and has a high speed of sound
transmission and a small internal loss.
Examples of the material forming the surface layer 5a include pulp with high degree of freeness,
pulp containing three or more micas, mica (mica), biocellulose, and composite materials thereof.
The back layer 5b is formed of a soft (flexible) strong material having a low speed of sound
transmission and a large internal loss (with a Q of about 5 to 15). Examples of the material
forming the back layer 5b include pulp with low freeness, wool, sizing material of manila hemp
and latex, and composite materials of these. The surface layer 5a and the back surface layer 5b
are bonded to each other at the time of paper making, as described later, and are therefore
bonded to each other without being bonded by an adhesive or the like.
[0024]
The surface layer 5a is formed to have a thickness of, for example, about 0.1 mm. The back layer
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5b is formed to have a thickness of, for example, about 0.1 mm to 0.2 mm.
[0025]
An edge portion 13a is integrally formed with the back surface layer 5b at the peripheral portion
of the back surface layer 5b. That is, this diaphragm 5 is a diaphragm of a fixed edge cone. The
edge portion 13a is formed only of the material forming the back surface layer 5b by the outer
peripheral edge of the surface layer 5a being located inside the edge portion 13a. Therefore, the
edge portion 13a has flexibility and can be displaced in the front-rear direction. The edge portion
13a is formed in an annular shape, and has a shape bulging in a cylindrical surface shape with
respect to the front side (the sound output direction).
[0026]
The diaphragm 5 is formed in a substantially conical shape, and has a through hole at its central
portion. The coil bobbin 6 is fitted and attached to the through hole in the central portion of the
diaphragm 5. The coil bobbin 6 is formed in a cylindrical shape, and supports the diaphragm 5 at
a front end side portion. The front end of the coil bobbin 6 is closed by a cap 12.
[0027]
The coil bobbin 6 is desirably formed to be lightweight while having high rigidity. Therefore, it is
desirable that the coil bobbin 6 be formed by rounding a synthetic resin material such as paper
or cloth impregnated with epoxy resin, a glass-epoxy board (glass fiber material solidified with
epoxy resin), etc. into a cylindrical shape. Further, the coil bobbin 6 may be formed of a metal
plate, paper or the like.
[0028]
The voice coil 7 is bonded to the outer peripheral surface of the rear end side of the coil bobbin
6. The voice coil 7 is wound into a cylindrical shape and has a lead wire. These lead wires are
soldered to the tinsel wire 10 and connected to the input terminal 11 attached to the frame 8
through the support member via the tinsel wire 10.
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[0029]
The voice coil 7 is located in the magnetic gap portion 14. That is, the voice coil 7 is coaxial with
the center pole portion 1 and is inserted between the center pole portion 1 and the inner surface
of the through hole at the central portion of the top plate 4.
[0030]
That is, when the coil bobbin 6 to which the voice coil 7 is attached is attached to the diaphragm
5, a voice coil spacer is inserted between the outer peripheral surface of the center pole portion
1 and the inner peripheral surface of the coil bobbin 6. With the coil bobbin 6 positioned relative
to the center pole portion 1, the coil bobbin 6 is adhered to the diaphragm 5. Then, after the
adhesive for bonding the coil bobbin 6 to the diaphragm 5 is solidified, the voice coil spacer is
removed so that the coil bobbin 6 is positioned with respect to the center pole portion 1, It is
fixed.
[0031]
The front end side portion of the coil bobbin 6 is suspended movably in the front-rear direction
by the rear end side portion of the frame 8 via a flexible and vibration absorbing damper 9.
[0032]
The damper 9 is formed of a cloth or a material such as paper in a substantially disc shape
having a plurality of concentric bending portions (corrugation portions) serving as displacement
portions, and has a circular through hole at the central portion. ing.
The outer peripheral surface portion of the coil bobbin 6 is joined to the inner peripheral edge
portion of the through hole at the central portion, and the outer peripheral edge portion of the
damper 9 is attached to the frame 8 to suspend the coil bobbin 6.
[0033]
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8
In the speaker device according to the present invention configured as described above, an
electric signal is supplied as a drive current to the voice coil 7 through the input terminal 11, so
that the coil bobbin 6 is not connected to the center pole portion 1. Driving in the axial direction,
the diaphragm 5 is vibrated to reproduce sound.
[0034]
In this speaker device, the allowable input is a speaker device having a diaphragm having an
edge member made of cloth material attached to a free edge cone (one-layer structure) and a
speaker device having a diaphragm of a conventional fixed edge cone (one-layer structure) And
the middle grade.
In this speaker device, the lowest resonance frequency is equivalent to that of the speaker device
having a diaphragm in which an edge member made of cloth material is attached to a free edge
cone (one-layer structure).
[0035]
That is, in this speaker device, the back surface layer 5b of the central portion of the diaphragm
5 and the lower resonance frequency determined by the stiffness of the edge portion 13a made
of the same material as the back surface layer 5b are determined. Sound can be reproduced over
high frequencies determined by the stiffness of the surface layer 5a. Further, in this speaker
device, since the split resonance that easily occurs in the surface layer 5a in the high frequency
band is damped by the back surface layer 5b, good reproduction characteristics are realized.
[0036]
In order to produce the diaphragm 5 composed of the surface layer 5a and the back surface layer
5b as described above, first, the pulp material forming the layers 5a and 5b is disintegrated,
beaten and broken using a beater. Disaggregation is the breaking up of the fibers of the pulp
material into pieces. Beating is the further comminution of the fibers of the pulped pulp material,
which is carried out until the desired degree of beating is reached. The pulp material that has
reached the desired degree of freeing is mixed and fixed with a size material, a dye and other
mixed materials. Thus, the pulp material which has been subjected to disaggregation, beating,
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mixing in of the mixed material, and fixation is added with water to make pulp water having a
concentration suitable for papermaking.
[0037]
Then, as indicated by the arrow P in FIG. 4, the above-mentioned pulp water is supplied onto the
paper mesh 202 of the paper making jig 201, and the pulp is stacked on the paper mesh 202 for
paper making. From the lower side of the wire mesh 202 for papermaking, as indicated by arrow
B in FIG. 4, the pulp water is sucked through the wire mesh 202 for paper making by a vacuum
pump.
[0038]
As shown in FIG. 4, the metal mesh 202 for papermaking, whose central portion bulges
downward, is for regular filtration, and the back surface layer 5 b is produced in advance. That is,
after the material forming the back surface layer 5b is deposited on the paper mesh 202, the
material forming the surface layer 5a is deposited on the deposited layer of the material forming
the back surface layer 5b.
[0039]
Here, the amount of the material forming the surface layer 5a and the amount of the material
forming the back surface layer 5b are those with desired minimum resonance frequency,
reproduction acoustic characteristics, sound quality, etc. when completed as the diaphragm 5.
Make adjustments as appropriate. Further, the peripheral portion of the wire mesh 202 for
papermaking has a shape for forming the edge portion 13a. The material for forming the surface
layer 5a is prevented from being deposited on the portion having the shape for forming the edge
portion 13a.
[0040]
Next, the material forming each of the layers 5a and 5b on the wire mesh 202 for papermaking is
dewatered, pressurized while being heated to about 220 ° C. by a heating press, dried and
shaped, and the diaphragm 5 is completed. Do.
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[0041]
In this speaker device, as shown in FIGS. 2 and 3, the surface layer 5a is formed only in the
central portion of the diaphragm 5, that is, in the vicinity of the portion to which the coil bobbin
6 is attached. You may do it.
In this case, in particular, the rigidity of the part driven by the voice coil 7 in the high frequency
band becomes high, and the high frequency characteristics are improved.
[0042]
In order to produce such a diaphragm 5, as shown in FIG. 4, when depositing the material for
forming the surface layer 5a on the deposited layer of the material for forming the back surface
layer 5b, a cylindrical jig is used. Using 203, the material forming the surface layer 5a is
deposited only on the central portion of the paper mesh 202.
[0043]
In the speaker device according to the present invention, as shown in FIGS. 5 and 6, the
diaphragm 5 is formed between the surface layer 5a, the back surface layer 5b, and the surface
layer 5a and the back surface layer 5b. It may be a three-layer structure having an intermediate
layer.
The diaphragm 5 having such a three-layer structure is configured such that the combined
thickness of the three layers shown by the arrow t in FIG. 6 is, for example, about 0.5 mm.
[0044]
As shown in FIG. 9, such a three-layered diaphragm 5 can be manufactured on a turntable 204
on which a plurality of papermaking wire nets are provided at equal angular intervals. The
turntable 204 is rotatably supported at its central portion by a support shaft 205, as shown by
arrow A in FIG.
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11
[0045]
In the turntable 204, deposition of the material for forming the back surface layer 5b having the
edge portion 13a is performed on the papermaking mesh at the first position S1. Next, when the
wire mesh for paper making that is at the first position S1 reaches the second position S2 due to
the rotation of the turntable 204, deposition of the material that forms the intermediate layer 5c
on the wire mesh for paper making. Is done. When the wire mesh for paper making reaches the
third position S3 due to the rotation of the turntable 204, the material forming the surface layer
5a is deposited on the wire mesh for paper making. To be done. When the paper mesh is in the
third position S3 due to the rotation of the turntable 204 and reaches the fourth position S4, the
heat press of the material deposited on the paper mesh is performed on the paper mesh. Drying
and shaping are carried out.
[0046]
Then, when the wire mesh for paper making reaches the fifth position S5 due to the rotation of
the turntable 204, the diaphragm 5 is taken out from the wire mesh for paper making. When the
paper-making wire mesh that is in the fifth position S5 reaches the sixth position S6 by the
rotation of the turntable 204, the paper-making wire mesh is washed. Then, the cleaned paper
mesh is brought to the first position S1 by the rotation of the turntable 204.
[0047]
The speaker device having the diaphragm 5 of the three-layer structure manufactured in this
manner is manufactured (aperture 61 mm, inner diameter 43 mm of the edge portion 13a), and
as shown in FIG. A) (dB), frequency-impedance characteristics (curve D in FIG. 10) (.OMEGA.) And
frequency-distortion characteristics (curves B and C in FIG. 10) were measured. This
characteristic is shown in FIG. 15, each characteristic (frequency-sound pressure characteristic
(curve A in FIG. 15) (dB), frequency-impedance characteristic of the speaker apparatus having the
diaphragm of the conventional fixed-edge structure fixed edge cone. In comparison with the
curve D in FIG. 15 (Ω) and the frequency-distortion characteristics (curves B and C in FIG. 15
(%)), the lowest resonance frequency of the speaker device having the diaphragm 5 of the threelayer structure Low, and in particular, the frequency-sound pressure characteristic at 4,000 Hz to
20,000 Hz draws a smooth curve.
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[0048]
In the above speaker device, when the diaphragm 5 has a three-layer structure, the intermediate
layer 5c is harder and faster than the material forming the surface layer 5a and the back layer
5b. It is good to form with a material with small internal loss.
[0049]
Thus, in the case where the diaphragm 5 has a three-layer structure and the material forming the
intermediate layer 5c is harder than the material forming the surface layer 5a and the back
surface layer 5b. As shown in FIG. 8, by providing the intermediate layer 5c only at the central
portion of the diaphragm 5, only the central portion of the diaphragm 5 has a three-layer
structure, and the peripheral portion of the diaphragm 5 is It may be a two-layer structure of the
surface layer 5a and the back layer 5b.
[0050]
Further, in the speaker device according to the present invention, among the materials forming
the diaphragm 5, various heat melting polymer materials, so-called foam materials, as hard, fast
sound speed, and small internal loss materials Alternatively, so-called heat-bonded fiber
materials, hollow fiber materials, or pulp materials mixed with these materials can be used.
[0051]
Examples of the polymer material having heat melting property include polyvinyl alcohol (PVA).
And, as a foam material comprising fibrous vinylon intermediate (PVA fiber) taken out from the
step of spinning and drawing this polyvinyl alcohol solution, "FIBRIBOND" (trade name) (paper
name) manufactured by Kuraray Co., Ltd. There is a fibrous binder for force enhancement.
That is, when a diaphragm is formed using a pulp material mixed with this "fbri bond", it is
possible to form a rigid, high-speed sound, small internal loss, and light-weight diaphragm.
[0052]
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13
The hollow fiber material is, for example, "ES fiber (trade name)" manufactured by Chisso
Corporation.
This "ES fiber" is a fiber modified with polypropylene, and is a fiber obtained by combining
polypropylene and polyethylene in a parallel type. That is, when a diaphragm is formed using a
pulp material mixed with this “ES fiber”, it is possible to form a rigid, high-speed sound, small
internal loss, and lightweight diaphragm.
[0053]
When one layer of the diaphragm 5 is formed of the heat-fusible polymer material, the so-called
foam material, the heat-bonding fiber material, or the pulp material containing them, heating by
the heat press and heating At the time of pressure, the polymer material or the like melts and
foams and adheres to another layer, whereby the diaphragm 5 is configured.
[0054]
When the diaphragm 5 has a three-layer structure, the intermediate layer 5c is formed of the
heat-fusible polymer material, a so-called foam material, a heat-bonding fiber material, or a pulp
material containing them. In this case, there is no possibility that the molten polymer material or
the like adheres to the press mold at the time of heating and pressing by the heating press, so
that the diaphragm 5 can be easily manufactured.
In this case, the intermediate layer 5c adheres to the surface layer 5a and the back surface layer
5b at the time of melting and foaming.
[0055]
When the diaphragm 5 has a three-layer structure, as shown in FIG. 7, the diaphragm 5 is formed
as a diaphragm of a free edge cone, and an edge formed separately from the diaphragm. The
member 13 may be attached to the outer peripheral edge.
[0056]
Thus, a speaker device having the free edge cone diaphragm 5 of the three-layer structure in
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14
which the intermediate layer 5c is a foam material is manufactured (diameter 61 mm, inner
diameter 43 mm of the edge portion 13a), as shown in FIG. The characteristics of frequencysound pressure characteristics (curve A in FIG. 11) (dB), frequency-impedance characteristics
(curve D in FIG. 11) (.OMEGA.) And frequency-distortion characteristics (curves B and C in FIG.
11) (%) Was measured.
This characteristic is shown in FIG. 14 for each characteristic (frequency-sound pressure
characteristic (curve A in FIG. 14) (dB), frequency-impedance characteristic of a speaker
apparatus having a conventional free edge cone diaphragm of a single-layer structure. In
comparison with the curve D in FIG. 14 (.OMEGA.) And the frequency-distortion characteristics
(curves B and C in FIG. 14 (%)), the lowest resonance frequency is lower in the speaker apparatus
having the diaphragm 5 of the three-layer structure. Because the frequency-sound pressure
characteristics are low and the diaphragm 5 is lightweight, the sensitivity particularly at 200 Hz
to 1,500 Hz is increased.
[0057]
In the diaphragm 5 having a three-layer structure with an aperture of about 60 mm as described
above, when the intermediate layer 5c is formed of a foam material, the total weight is about 0.4
g and the thickness is It is about 0.5 mm. Further, in the diaphragm 5, the weight distribution of
the surface layer 5a, the intermediate layer 5c, and the back surface layer 5b is about 3: 2: 3
(0.15 g: 0.1 g: 0.15 g).
[0058]
In the speaker device according to the present invention, when the diaphragm 5 has a three-layer
structure, the surface layer 5a and the back layer 5b are harder than the material forming the
intermediate layer 5c. It may be made of a material having a high sound velocity and a small
internal loss.
[0059]
As described above, in the speaker device according to the present invention, in the diaphragm
attached with the coil bobbin provided with the voice coil, at least two layers of the surface layer
and the back layer having different internal losses are different from each other. It is joined and
constituted.
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15
Therefore, in this speaker device, if a diaphragm of a fixed edge cone in which an edge portion is
integrally formed in a layer having a large internal loss among a plurality of layers constituting
the diaphragm, reproduction acoustics is reproduced. It is possible to facilitate the manufacture
and assembly without causing the deterioration of the frequency characteristics and the
reduction of the allowable input.
[0060]
That is, according to the present invention, the minimum resonance frequency is sufficiently
lowered without causing enlargement and complication of the device configuration, and the
deterioration of the reproduction characteristics of the low frequency band and the reduction of
the sound pressure level of the reproduction sound are caused. In addition, it is possible to
provide a speaker device in which the allowable input is made sufficiently large and sound
reproduction can be satisfactorily performed in the entire band including the low frequency
band.
[0061]
Brief description of the drawings
[0062]
1 is a longitudinal sectional view showing the configuration of the speaker device according to
the present invention.
[0063]
2 is a longitudinal sectional view showing another example of the configuration of the speaker
device according to the present invention.
[0064]
3 is a front view showing the configuration of the diaphragm of the speaker device shown in FIG.
[0065]
4 is a longitudinal sectional view showing the configuration of a manufacturing apparatus for
manufacturing the diaphragm shown in FIG.
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[0066]
5 is a longitudinal sectional view showing still another example of the configuration of the
speaker device according to the present invention.
[0067]
6 is a longitudinal cross-sectional view of the main part showing the configuration of the edge
portion of the diaphragm which is the main part of the speaker device shown in FIG.
[0068]
7 is an essential part longitudinal sectional view showing another example of the configuration of
the edge portion of the diaphragm which is the essential part of the speaker device shown in FIG.
[0069]
8 is a longitudinal sectional view showing still another example of the diaphragm constituting the
speaker device according to the present invention.
[0070]
<Figure 9> It is the groundplan which shows the constitution of the manufacturing device which
manufactures the diaphragm of the speaker device which relates to this invention.
[0071]
10 is a graph showing the characteristics of frequency-sound pressure (dB), frequencyimpedance (Ω) and frequency-distortion (%) of the speaker device according to the present
invention.
[0072]
11 is a graph showing another example of each characteristic of frequency-sound pressure (dB),
frequency-impedance (Ω) and frequency-distortion (%) of the speaker device according to the
present invention.
[0073]
12 is a longitudinal sectional view showing the configuration of a conventional speaker device.
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[0074]
13 is a longitudinal sectional view showing another example of the diaphragm constituting the
conventional speaker device.
[0075]
14 is a graph showing the characteristics of frequency-sound pressure (dB), frequencyimpedance (Ω) and frequency-distortion (%) of the conventional speaker device.
[0076]
FIG. 15 is a graph showing another example of the frequency-sound pressure (dB), frequencyimpedance (Ω) and frequency-distortion (%) characteristics of the conventional speaker device.
[0077]
Explanation of sign
[0078]
DESCRIPTION OF SYMBOLS 1 center pole part, 2 yoke, 3 magnet, 4 top plate, 5 diaphragm, 5a
surface layer, 5b back layer, 5c middle layer, 6 coil bobbin, 7 voice coil, 8 frames, 14 magnetic
gap part
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