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JP2006109090

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DESCRIPTION JP2006109090
PROBLEM TO BE SOLVED: To reinforce a diaphragm of a speaker device easily and favorably.
SOLUTION: A loudspeaker diaphragm 20 configured by connecting a dome-shaped diaphragm
21 and an edge-shaped diaphragm 22 and vibrating using a voice coil, and a connection flat
portion or the vicinity of the connection flat portion of the diaphragm. In the speaker device
provided with the reinforcing ring 30 for reinforcing the speaker, the reinforcing ring 30 is
formed of a breathable material, and the reinforcing ring 30 having the breathability can be a
connection flat portion or connection of the diaphragm 20 Bond in the vicinity of the flat part.
[Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device used for various audio devices, video devices,
and the like, and more particularly to a speaker device in which the strength of a connection flat
portion of an acoustic diaphragm is improved.
[0002]
As an acoustic diaphragm used for the conventional speaker apparatus, there exists the acoustic
diaphragm 10 of a structure as shown, for example in FIG.
In FIG. 7, the acoustic diaphragm 10 is shown cut in half for the sake of illustration, and has a
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dome-shaped dome-shaped diaphragm 11 at the center and a cross-sectional shape from the
circular edge of the dome-shaped diaphragm 111 In order to have a predetermined concave or
convex curvature, or the linear edge-shaped diaphragm 12 is integrally formed of a polymer film,
metal or the like. Further, the diaphragm edge 14 is integrally formed on the outer peripheral
portion of the edge-shaped diaphragm 12 via the connection flat portion 13.
[0003]
A connecting portion for integrating the dome-shaped diaphragm 11 and the edge-shaped
diaphragm 12 of the acoustic diaphragm 10 is joined so that the bobbin 16 around which the
voice coil 17 is wound is suspended and a magnetic gap not shown is formed. The voice coil 17 is
disposed so as to be swingable up and down in the gap to be formed, and is assembled as a
speaker device. An adhesive is used to join the acoustic diaphragm 10 and the bobbin 16.
[0004]
The speaker device using the acoustic diaphragm having the shape shown in FIG. 7 is configured
as, for example, an electrodynamic speaker which is relatively small and capable of reproducing
up to a high frequency (for example, 100 kHz). By the way, since this type of acoustic diaphragm
10 is obtained by integrally molding a thin metal sheet, such as aluminum, titanium, or a polymer
sheet, the dome-shaped diaphragm 11 and the edge-shaped diaphragm 12 The metal sheet and
polymer sheet in the part that connects the two are pulled in both directions on the dome-shaped
diaphragm 11 and edge-shaped diaphragm 12 side when molded into a shape as a diaphragm, so
the thickness becomes thinner and mechanical strength Was inconvenient.
[0005]
Further, when the bobbin 16 is bonded to the connecting portion between the dome-shaped
diaphragm 11 and the edge-shaped diaphragm 12 and an acoustic signal is input to the voice coil
17, the connection is thin at a predetermined frequency and weak in mechanical strength. With
the portion 12 as a node, the dome-shaped diaphragm 11 and the edge-shaped diaphragm 12
produce vibrations 180 degrees out of phase. At this frequency, the acoustic signal generated
from the dome-shaped diaphragm 11 and the acoustic signal generated from the edge-shaped
diaphragm 12 cancel each other, causing a dip in sound pressure. In particular, there is a
disadvantage that the quality of the acoustic signal is degraded when the dip is in the audible
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range.
[0006]
Furthermore, at a high frequency of 20 kHz or more, the driving force from the bobbin 16 is
absorbed by the adhesive and the bonding surface of the diaphragm 10 having weak mechanical
strength, and is not transmitted to the edge-shaped diaphragm 12. As a result, there is a problem
that the required sound pressure can not be obtained at a high frequency of 20 kHz or more.
[0007]
In order to solve these problems, the present inventors previously attached a resin film
reinforcing ring 15 to the bobbin 16 bonded portion of the acoustic diaphragm 10 as shown in
FIG. It was proposed that the bobbin 16 be attached via the reinforcing ring 15. As described
above, by attaching the bobbin to the acoustic diaphragm through the reinforcing ring, the
mechanical strength of this portion can be increased, and the various problems described above
can be solved. Unexamined-Japanese-Patent No. 2003-348691
[0008]
By the way, the above-described reinforcing ring is shaped in advance to be adhesively fixed, and
after the diaphragm for the speaker formed by connecting the dome-shaped diaphragm and the
edge-shaped diaphragm is molded, an adhesive is used. There is no problem if it is fixed by
adhesion. However, when molding a speaker diaphragm configured by connecting a domeshaped diaphragm and an edge-shaped diaphragm, the following problems occur when the
reinforcing ring is bonded and fixed.
[0009]
That is, as a material of the diaphragm for the speaker, a very low permeability resin film such as
polyethylene terephthalate, polyethylene naphthalate, polyimide, polyetherimide, polycarbonate,
etc., a very low permeability metal film such as aluminum or titanium, other ventilation When
using a low permeability film, press molding, air pressure molding, vacuum molding, or a
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combination of these, any penetration through the film and diaphragm mold to escape the air
present A hole is provided or a porous mold is used. When bonding and fixing the reinforcing
ring together with the diaphragm molding using the material with very low air permeability by
the diaphragm molding method, the air existing between the diaphragm and the reinforcing ring
is released by some method There must be. When, for example, the resin film described above is
used as the material of the reinforcing ring, the resin film can be relatively easily formed into the
shape of the reinforcing ring, but between the diaphragm and the reinforcing ring at the time of
forming the diaphragm Air is left behind, which causes a problem that the diaphragm and the
reinforcing ring are not sufficiently firmly adhered.
[0010]
Thus, if air is left between the diaphragm and the reinforcing ring, the bonding strength between
the reinforcing ring and the diaphragm is reduced, and eventually the above-mentioned lack of
mechanical strength of the diaphragm can not be eliminated. There was a problem like that.
[0011]
The present invention has been made in view of the foregoing, and it is an object of the present
invention to easily and favorably reinforce a diaphragm of a speaker device.
[0012]
In the present invention, a dome-shaped diaphragm and an edge-shaped diaphragm are
connected, and the speaker diaphragm is vibrated using a voice coil, and the connection flat
portion or the vicinity of the connection flat portion of the diaphragm is reinforced. In the
speaker device provided with the reinforcing ring, the reinforcing ring is formed of an airpermeable material, and the air-permeable reinforcing ring is bonded to the connection flat
portion of the diaphragm or the vicinity of the connection flat portion. It is intended to
[0013]
By doing this, as the adhesion state of the reinforcing ring to the diaphragm, air does not remain
due to the air permeability of the reinforcing ring itself, and a good adhesion state in which the
reinforcing ring is in close contact with the diaphragm is achieved.
[0014]
According to the present invention, as the adhesion state of the reinforcing ring to the
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diaphragm, air does not remain due to the air permeability of the reinforcing ring itself, and the
reinforcing ring adheres to the diaphragm in a good adhesion state, and vibration is reliably
achieved. The bobbin attachment of the plate can be reinforced.
Therefore, the mechanical strength of the connection flat portion of the diaphragm formed by
integrally molding the dome-shaped diaphragm and the edge-shaped diaphragm can be
enhanced, and the most efficient conversion from the vibration to the sound output can be
performed. For example, it is possible to provide a speaker device capable of reproducing at high
frequencies up to, for example, 100 kHz.
[0015]
In this case, the adhesive agent is applied to the reinforcing ring in order to adhere to the
diaphragm, and by setting the reinforcing ring to the air permeable state, the air permeability can
be reliably ensured at the time of the adhesion operation, which is favorable. Good adhesion is
obtained.
[0016]
Also, in this case, by using a thermoplastic adhesive as the adhesive applied to the reinforcing
ring, the reinforcing ring can be easily and reliably adhered to the diaphragm without any gap in
the heat forming process of the diaphragm. it can.
[0017]
Further, as the air permeability of the reinforcing ring, when the air permeation resistance is 100
seconds or less, sufficient permeation performance can be secured.
[0018]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1
to 6.
[0019]
The present embodiment is an example applied to an electrodynamic-type electromagnetic
induction speaker. First, the entire configuration of the electrodynamic-type electromagnetic
induction speaker of the present example will be described with reference to FIGS. 3 and 4.
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FIG. 3 shows a side sectional view of the electrodynamic-type electromagnetic induction speaker
of this example, and FIG. 4 shows an equivalent circuit of the electrodynamic-type
electromagnetic induction speaker shown in FIG.
[0020]
In FIG. 3, the speaker device 1 is composed of a frame portion, an acoustic diaphragm and drive
means.
The frame is integrally formed with the lower surface plate 2a at a substantially central position
of the lower surface plate 2a made of disc-like metal, and a cylindrical pole piece 2 having a
diameter smaller than the diameter of the lower surface plate is erected. The concentric magnets
6 are joined to the lower surface plate 2a so as to surround the outer periphery.
[0021]
Further, a disc-like top plate 7 made of metal concentrically formed on the magnet 6 is joined.
The cylindrical frame 5 fitted to the outer periphery of the upper surface plate 7 is integrated
with the upper surface plate 7 to form a frame portion.
[0022]
As described later, the acoustic diaphragm 20 has a convex dome-shaped diaphragm at the
center and a linear edge-shaped diaphragm so that the cross-sectional shape has a curvature R
from the edge of the dome-shaped diaphragm. Configured
[0023]
The driving means of the electromagnetic induction type speaker is the excitation primary coil 3a
wound on the pole piece 2 or a disc-like pole piece plate fixed on the pole piece 2 (not shown)
and the upper plate 7 In the gap 8 formed between the inner circumferences, the conductive ring
3 fitted to the inner diameter of the bobbin 4 suspended from the connection flat portion of the
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acoustic diaphragm 5 to be described later is disposed so as to face the electromagnetic
induction. When a drive current such as an acoustic input signal is supplied via the current, the
current flowing through the exciting primary coil 3a changes, and the magnetic field generated
by the magnet 6 and the exciting primary coil 3a changes, so that an induced current is
generated in the conductive ring 3 As the conductive ring 3 vibrates up and down by the
electromagnetic force, the acoustic diaphragm 5 vibrates correspondingly.
[0024]
FIG. 4 shows an equivalent circuit of the induction portion of the electrodynamic type
electromagnetic induction speaker shown in FIG. 3, and the resistance R1 on the primary side of
the input impedance Zin corresponding to the excitation primary coil 3a shown in FIG. When a
voltage V1 equivalent to an acoustic input signal is applied to the inductance L1, a current I1
flows, and a secondary side resistance R2 equivalent to the conductive 1 turn ring 3 and an
inductance L2 equivalent to an output signal by induction by a mutual inductance M By the flow
of the current I 2, a driving force for moving the conductive 1 turn ring 3 up and down is
generated, and an acoustic signal can be emitted from the acoustic diaphragm 5.
[0025]
Next, the configuration of the acoustic diaphragm 20 of the present example, which is attached
to the speaker device configured as described above, will be described.
FIG. 1 is a view showing the acoustic diaphragm 20 for a speaker of this example broken in half.
The acoustic diaphragm 20 has a dome-shaped diaphragm 21 at the center, and from the circular
edge of the dome-shaped diaphragm 21, the sectional shape has a predetermined concave or
convex curvature or a linear edge-shaped diaphragm 22 are integrally formed of a material
having very low air permeability such as a polymer film or metal.
Furthermore, the diaphragm edge 24 is integrally formed on the outer peripheral portion of the
edge-like diaphragm 22 via the connection flat portion 23.
The configuration of the acoustic diaphragm 20 so far is the same as that of the acoustic
diaphragm 10 shown in FIGS. 7 and 8 as a conventional example.
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[0026]
Then, as shown in FIG. 3, a bobbin in which a conductive ring 3 corresponding to a voice coil is
wound at a connecting portion where the dome-shaped diaphragm 21 and the edge-shaped
diaphragm 22 of the acoustic diaphragm 20 are integrated. A reinforcing member (reinforcing
ring) 30 formed in a ring shape is disposed between the acoustic diaphragm 20 and the bobbin 4
so as to be connected so as to hang down.
[0027]
FIG. 2 is a view showing the reinforcing member 30 of this example in a broken manner in half.
The reinforcing member 30 in this example is made of a breathable material such as paper, a
woven fabric of resin fibers, and a non-woven fabric.
The one surface of the ring-shaped reinforcing member 30 is an adhesive application surface 31.
In this case, as an adhesive applied to the adhesive application surface 31, a thermoplastic
adhesive such as a hot melt adhesive is used, for example, so that the adhesive can be adhered to
the diaphragm 20 in the heating process. is there.
Furthermore, as a state of application of the adhesive to the adhesive application surface 31, for
example, a granular adhesive is applied in a non-uniform state (that is, in a state where there is a
gap to some extent). The member 30 is made breathable.
[0028]
As the air permeability of the reinforcing member 30, for example, a Gurley value representing
an air permeability can be used as an index. The Gurley value of the material which comprises
the reinforcement member 30 has a preferable Gurley densometer B type | mold, for example,
0.1 to 100 second / 100 cc. If the numerical value is larger than this, the practical transmission
performance is not sufficient, so that the air present between the diaphragm 20 and the
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reinforcing member 30 can not be sufficiently excluded in the manufacturing process to be
described later. There is something I can not do. On the other hand, if the numerical value is
smaller than this, the mechanical strength may be inferior.
[0029]
In FIG. 2, the ring-shaped reinforcing member 30 is formed in a substantially V-shape, and the
shape of a connecting portion that integrates the dome-shaped diaphragm 21 and the edgeshaped diaphragm 22 of the acoustic diaphragm 20. In practice, the reinforcing member 30 may
have a shape cut out in a flat ring shape, and has a shape shown in FIG. 2 in the manufacturing
process and will stick to the acoustic diaphragm 20.
[0030]
Next, processing in a manufacturing process for bonding the reinforcing member 30 to the
acoustic diaphragm 20 will be described with reference to FIGS. 5 and 6.
In the present embodiment, the reinforcing member 30 is simultaneously adhered at the time of
the process of forming the flat acoustic diaphragm forming film 20 'as the acoustic diaphragm
20 having the shape shown in FIG.
[0031]
FIG. 5 is a view showing an example in which the acoustic diaphragm 20 is formed. Here, the flat
acoustic diaphragm forming film 20 'is pressed against the mold 110 disposed in the chamber
100 to form the acoustic diaphragm 20 having the shape shown in FIG. The mold 110 has a
shape corresponding to the shape of the diaphragm 20 such as the dome-shaped diaphragm
molding portion 111, the edge-shaped diaphragm molding portion 112, and the diaphragm edge
molding portion 113.
[0032]
Then, at the time of molding, the mold 110 is heated, and the film 20 'is pressed against the mold
110 by high pressure air as shown by the arrow a. Furthermore, an exhaust port 121 is formed
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in a plurality of places in the mold 110, and suction is performed from the exhaust port 121 as
indicated by an arrow v, whereby the film 20 'is in close contact with the surface of the mold
110. As shown in FIG. 6, the acoustic diaphragm 20 is formed into a predetermined shape.
[0033]
Here, in the present embodiment, as shown in FIG. 5, the ring-shaped reinforcing member 30 is
disposed in advance in a portion of the mold 110 where the connecting portion between the
dome-shaped diaphragm 21 and the edge-shaped diaphragm 22 is formed. Keep it. At this time,
the adhesive application surface 31 of the reinforcing member 30 is set to the surface (upper
side in FIG. 5) which is not in contact with the mold 110. Moreover, let the adhesive agent apply |
coated to the application surface 31 be an adhesive agent fuse | melted at the overheating
temperature at the time of this shaping | molding.
[0034]
By arranging the ring-shaped reinforcing member 30 in this way and forming the acoustic
diaphragm 20, as shown in FIG. 6, the reinforcing member 30 adheres to the acoustic diaphragm
20 when the formation is completed. Here, in the case of this example, since the acoustic
diaphragm 20 itself is made of a material having low air permeability, the pressing of high
pressure air as shown by the arrow a and the arrow from the exhaust port 121 of the mold 110
The film constituting the acoustic diaphragm 20 is in close contact with the suction indicated by
v, but since the reinforcing member 30 disposed at that time is made of a material having air
permeability, the reinforcing member 30 I will not disturb you. Therefore, air will not be
accumulated between the acoustic diaphragm 20 and the reinforcing member 30, and the
reinforcing member 30 adheres to the acoustic diaphragm 20 in a close contact state.
[0035]
Thus, the acoustic diaphragm 20 in which the reinforcing member 30 is in close contact is
obtained, and as shown in FIG. 3, the loudspeaker apparatus having good characteristics can be
obtained by being assembled as a speaker apparatus using the diaphragm 20. can get. That is,
the adhesive strength between the ring-shaped reinforcing member and the diaphragm is
sufficiently maintained, the mechanical strength of the diaphragm becomes the necessary
strength, and the acoustic characteristics can be maintained favorably. For example, it is possible
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to obtain a speaker device capable of reproducing substantially flat up to high frequencies.
[0036]
Although the embodiment described above has described an example applied to an
electromagnetic induction type speaker device, the present invention may also be applied to an
acoustic diaphragm of a general electrodynamic type speaker device. It is possible.
[0037]
It is a perspective view which fractures and shows the diaphragm used for the speaker apparatus
of one embodiment of the present invention.
It is a perspective view which fractures and shows the ring for reinforcement used for the
speaker apparatus of one embodiment of the present invention. FIG. 1 is a cross-sectional view
showing a configuration of a speaker device showing an embodiment of the present invention.
FIG. 6 is an equivalent circuit diagram for explaining the operation of FIG. 3; It is sectional
drawing which shows the formation state (state before shaping | molding) of the diaphragm of
one embodiment of this invention. It is sectional drawing which shows the formation state (state
after shaping | molding) of the diaphragm of one embodiment of this invention. It is a
perspective view which fractures and shows the example of the conventional diaphragm. It is a
perspective view which fractures and shows the example of the diaphragm with the conventional
reinforcement ring.
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 ... Speaker apparatus, 2 ... Pole piece, 3 ... Conductive ring, 4 ...
Bobbin, 5 ... Cylindrical frame, 6 ... Magnet, 7: ... Upper surface plate, 8 ... Gap, 9 ... Signal input
line, 20 ... Acoustic diaphragm 20 '... film for forming acoustic diaphragm, 21 ... dome-shaped
diaphragm, 22 ... edge-shaped diaphragm, 23 ... connection flat part, 24 ... diaphragm edge, 30 ...
reinforcing member (reinforcement ring), 31 ... Adhesive coated surface, 100: chamber, 110:
mold, 111: dome shaped diaphragm formed portion 112: edge shaped diaphragm formed
portion, 121: exhaust port
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