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JPH0937389

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DESCRIPTION JPH0937389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for sound reproduction equipment and the like.
[0002]
2. Description of the Related Art A typical prior art will be described with reference to FIG. FIG. 7
is a cross-sectional view of the speaker, in which the frame 1 is attached to the top of the field
portion 11 composed of a plate and a magnet, and the magnetic gap portion of the field portion
is a damper 10 whose outer periphery is fixed to the frame 1 A supported voice coil 9 is
arranged. Further, the outer periphery is fixed to the frame 1 at the upper part, the inner
periphery is fixed to the voice coil 9, and a diaphragm 3 with an edge 2 having a dust cap 8 at its
center is attached. A voice coil lead wire 7 which is an extension of a voice coil wire is disposed
along the surface of the diaphragm 3 on the front surface of the diaphragm 3 and vibrates from
the voice coil lead wire 7 and a terminal 13 attached to the frame 1 There is an eyelet portion 5
which is soldered to the tinsel wire 12 led to the front of the diaphragm through an eyeletprocessed hole of the plate, and the voice coil lead 7 and the eyelet 5 fix and protect the voice
coil lead 7 The structure was covered with an adhesive of
[0003]
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However, in the above-described conventional structure, when the diaphragm 3 vibrates, the
voice coil lead 7 is bent and broken due to the deformation of the portion where the voice coil
lead 7 of the diaphragm 3 is disposed. The problem of having occurred. In particular, when a
lightweight wire or a thin wire is used for the voice coil wire in order to reduce the weight of the
vibration system and increase the reproduction sound pressure of the speaker, the strength of
the wire itself is reduced, so the lead wire breaks Was noticeable. Further, for the same purpose,
when the thickness of the diaphragm is reduced, the strength of the diaphragm itself is reduced,
so that deformation of the diaphragm becomes large and lead wire breakage has occurred
notably.
[0004]
FIG. 8 is a simulation model of a 12-cm aperture speaker including the edge 2, the diaphragm 3,
the voice coil 9, and the dust cap 8. The voice coil lead wire 7, the eyelet portion 5, and the lead
wire bonding portion 4 overwrite the simulation model for reference. The outer peripheral edge
of the edge 2 is fixed, a driving force is applied to the voice coil 9, and the deformation of the
diaphragm 3 is calculated. FIG. 9 shows deformation when a driving force equivalent to 50 W is
applied to the voice coil, but the deformation portion a is uniformly deformed in the
circumferential direction about 1 mm from the position in the case of no deformation of the
diaphragm 3 . Since the voice coil lead wire 7 is adhesively fixed to this deformed portion, the
voice coil lead wire 7 is bent and disconnected due to uniform deformation in the circumferential
direction of the diaphragm 3.
[0005]
The present invention solves such conventional problems, and voice coil leads are used as voice
coil wires, even if light wires or thin wires are used, or if a diaphragm with a thin diaphragm is
used. An object of the present invention is to provide a speaker which does not cause
disconnection of a wire.
[0006]
In order to achieve the above object, in the speaker of the present invention, a recess is formed
on the diaphragm, and the thickness from the recess outer surface to the diaphragm surface is
thicker than the diaphragm thickness, and The voice coil lead wire is disposed in the recess.
[0007]
In addition, the voice coil lead wire disposition portion and the diaphragm material density of the
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2
axially symmetric portion are characterized by being higher than other portions.
[0008]
According to the speaker of the present invention having such characteristics, the recess is
formed on the diaphragm and the thickness from the recess outer surface to the diaphragm
surface is thicker than the diaphragm thickness, so the strength of this portion is It will be higher
than the other parts, thus suppressing the deformation of the recess.
Further, since the voice coil lead wire is disposed inside this, bending deformation of the voice
coil lead wire can be suppressed.
[0009]
Furthermore, according to the speaker of the present invention, since the voice coil lead wire
arrangement portion and the diaphragm material density of the axially symmetrical portion are
higher than those of the other portions, the strength of these portions is increased and
deformation is suppressed. The bending deformation of the voice coil lead wire is suppressed,
and when the diaphragm is deformed, the non-axial symmetry of the vibration mode can be
achieved.
[0010]
The first embodiment of the present invention will be described below with reference to the
drawings.
In FIG. 1 and FIG. 2, the frame 1 of 12 cm in diameter is attached to the upper part of the field
section 11 using magnet of outer diameter φ 70 inner diameter φ 32 thickness t 10 There is a
voice coil 9 supported by a fixed damper 10, and the outer periphery is fixed to the frame 1 at its
upper part, the inner periphery is fixed to the voice coil 9, and the dust cap 8 of 26 mm in outer
diameter is The pulp diaphragm 3 with a thickness t of 0.2 mm with the up roll edge 2 of R6
having is attached.
In addition, a voice coil lead wire 7 made of aluminum and covered with copper from the voice
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coil 9 on the front surface of the diaphragm 3 has a depth of 0.2 mm and a thickness t of 0.2 mm
on the diaphragm 3. It is located inside.
The voice coil lead wire 7 and the tinsel wire 12 led from the terminal 13 attached to the frame 1
to the front surface of the diaphragm 3 through the eyelet-processed hole of the diaphragm 3 are
soldered at the front end portion 5 Furthermore, the voice coil lead wire 7 and the eyelet portion
5 have a structure covered with an adhesive for fixing and protecting the same.
[0011]
FIG. 3 shows a simulation result of deformation of diaphragm 3 of the speaker according to the
first embodiment of the present invention. This basic configuration is the same as that shown in
FIG. In addition, in simulation, the shape of the recessed part 6 was abbreviate | omitted and the
physical-property value of the recessed part 6 was given and it calculated. The Young's modulus
of the recess 6 is ten times the value of the other part of the diaphragm 3. This deformed portion
is suppressed by deformation of 0.1 mm from the position in the case of no deformation of the
diaphragm 3. Therefore, the deformation is reduced to 1/10 as compared with the conventional
speaker, and as a result, the defect rate due to the disconnection of the voice coil lead wire 7 is
also reduced to 1/10.
[0012]
Next, a second embodiment of the present invention will be described. In FIG. 4, the basic
configuration is the same as that of FIG.
[0013]
FIG. 5 shows a simulation result of deformation of the speaker diaphragm 3 according to the
second embodiment of the present invention. The basic configuration is the same as that of FIG.
8 and is obtained by adding the high density part 14. The deformed portion in the vicinity of the
high density portion 14 is suppressed by the deformation of 0.1 mm from the position in the
case of no deformation of the diaphragm 3. Therefore, as in the first embodiment, the defect rate
can be reduced.
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[0014]
Furthermore, FIG. 6 compares the sound pressure frequency characteristics of the conventional
speaker and the speaker of the second embodiment of the present invention. As described above,
in the speaker according to the present invention, the high density portion is in an axisymmetric
portion with the portion where the voice coil lead wire 7 is disposed. Therefore, when the
diaphragm 3 is deformed, the vibration mode is non-axially symmetric. The disturbance of the
characteristics due to the axisymmetric deformation is eliminated and the characteristics are
improved.
[0015]
As described above, according to the speaker of the present invention, the strength of the voice
coil lead wire placement portion can be increased regardless of the thickness of the diaphragm,
and the deformation of the portion can be suppressed. In order to reduce the weight of the
system and to increase the playback sound pressure of the speaker, make the diaphragm thinner
or prevent the lead from being broken even if a light wire or thin wire is used for the voice coil
wire. It becomes possible.
[0016]
Further, according to the speaker of the present invention, the strength of the high density
portion of the diaphragm can be increased, and the deformation of this portion can be
suppressed, so that the same effect as described above can be obtained and the high density
portion is manufactured. In this case, the shape of the press die may be a conventional general
shape only by partially reducing the hole diameter of the papermaking mesh of the diaphragm
material.
That is, even in a general diaphragm, it is possible to adopt the technology of the present
invention without changing the mold. Furthermore, the non-axial symmetry of the diaphragm
deformation makes it possible to prevent the disturbance of the sound pressure frequency
characteristic and to improve the characteristic.
[0017]
As described above, the loudspeaker according to the present invention is of great industrial
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value.
[0018]
Brief description of the drawings
[0019]
1 is a cross-sectional view of the speaker according to the first embodiment of the present
invention
[0020]
2 is an enlarged view of the voice coil lead wire arrangement portion of the speaker in the first
embodiment of the present invention
[0021]
Diagram showing the simulation result of the diaphragm deformation of the speaker in the first
embodiment of the present invention
[0022]
Fig. 4 Cross-sectional sketch of the speaker in the second embodiment of the present invention
[0023]
Figure 5 is a diagram showing the simulation result of the diaphragm deformation of the speaker
in the second embodiment of the present invention
[0024]
Fig. 6 Comparison of simulation results of sound pressure frequency characteristics of the
speaker and the conventional speaker in the second embodiment of the present invention
[0025]
Fig. 7 Cross-sectional view of the conventional speaker
[0026]
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Fig. 8 Diagram showing simulation results of diaphragm deformation of the conventional speaker
[0027]
Figure 9 same as above
[0028]
Explanation of sign
[0029]
Reference Signs List 1 frame 2 edge 3 diaphragm 4 lead wire bonding portion 5 eyelet portion 6
concave portion 7 voice coil lead wire 8 dust cap 9 voice coil 10 damper 11 field portion 12
tinsel wire 13 terminal
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