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JP2008177943

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008177943
An object of the present invention is to obtain an electromagnetic converter capable of securing a
sufficient sound pressure by obtaining a target impedance without excessively reducing the
width of a voice coil conductor. SOLUTION: Voice coils 7a and 7b are formed on both sides of a
flexible substrate 6 disposed between a front magnet 3 and a rear magnet 4, and voice coils 7a
and 7b on both sides are connected in series or in accordance with an assumed impedance.
Configure to be connected in parallel. As a result, it is possible to obtain a target impedance
without excessively narrowing or thickening the width of the conductors of the voice coils 7a and
7b. [Selected figure] Figure 1
Electromagnetic converter
[0001]
The present invention relates to, for example, an electromagnetic converter that reproduces an
audio signal.
[0002]
As a conventional electromagnetic converter, there is one in which a sheet magnet, which is a
permanent magnet plate, and a flexible substrate (diaphragm) are combined (see, for example,
Patent Document 1).
In the sheet magnet, strip-like different magnetic poles are alternately formed at regular
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intervals. On the diaphragm, a voice coil composed of a meander-shaped conductor pattern is
formed at a position facing the gap portion (a portion called a so-called neutral zone of
magnetization) of different magnetic poles of the permanent magnet plate.
[0003]
In the above-mentioned electromagnetic converter, when current which is an electric signal flows
to the voice coil of the diaphragm, the multipolar magnetization pattern of the voice coil and the
sheet magnet acts electromagnetically, and the flexible substrate is produced according to the
left hand rule of Fleming. The diaphragm, which is The sound vibration generated from the
diaphragm is radiated to the outside through sound radiation holes opened in the sheet magnet
and the case (support member).
[0004]
Here, the reproduction frequency and sound pressure of the electromagnetic converter are
largely affected by the width of the voice coil formed of the conductor pattern formed on the
vibrating film. The principle of generation of the sound vibration in the electromagnetic
converter is as described above, so the magnetic flux (magnetic flux in the horizontal direction
with respect to the sheet magnet) acting at a right angle to the magnetized pattern magnetized
multipolarly in the sheet magnet is maximized It is necessary to place the voice coil in the
following position. The point where the magnetic flux in the horizontal direction with respect to
the magnetized surface of the sheet magnet is maximum is the neutral zone at the boundary
between the S pole and the N pole or the N pole and the S pole.
[0005]
In this neutral zone, the width of the horizontal surface having a magnetic flux density of 80% or
more of the maximum magnetic flux density is, for example, about 1 mm from the center of the
neutral zone (the maximum point of the magnetic flux density It is obtained from the
measurement results that the range is 0.5 mm on the S pole side and 0.5 mm on the N pole side.
Therefore, if the voice coil is properly disposed at a position of ± 0.5 mm or less from the center
of the neutral zone, an electrical signal which is an input signal can be efficiently converted into
an audio signal.
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[0006]
However, in order to arrange the voice coil in a place where the magnetic flux density is
sufficiently concentrated, the electrical signal which is the input signal can not be efficiently
converted into the voice signal unless the width of the conductor of the voice coil is also a certain
value or less. . That is, if the distance between the magnetic poles is about 3 mm, it is necessary
to arrange the conductor of the voice coil in a range of about 1 mm from the center of the
neutral zone, so the width of the conductor of the voice coil needs to be 1 mm or less. The width
of the voice coil conductor is closely related to the impedance of the electromagnetic converter,
and in the conventional electromagnetic converter, the width of the voice coil conductor and the
number of turns of the voice coil are required to obtain the target impedance. It is made to adjust
by etc.
[0007]
JP-A-9-331596 (paragraphs [0016] to [0026], FIG. 1)
[0008]
Since the conventional electromagnetic converter is configured as described above, the target
impedance can be obtained by adjusting the width of the voice coil conductor and the number of
turns of the voice coil.
However, if the width of the voice coil conductor is made too narrow, large power can not be
applied to the voice coil, and sufficient sound pressure can not be obtained, and the resistance
value of the voice coil tends to change due to aging. There was a problem. In addition, when the
width of the voice coil is too large, the voice coil is disposed also in the part where the magnetic
flux is concentrated in the neutral zone and the electric signal flows, so that the conversion
efficiency of the audio signal is deteriorated. .
[0009]
The present invention has been made to solve the above-mentioned problems, and it is sufficient
to obtain a desired impedance without excessively narrowing or thickening the width of the voice
coil conductor. It is an object of the present invention to obtain an electromagnetic converter
capable of securing a stable sound pressure.
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[0010]
In the electromagnetic converter according to the present invention, the voice coil is formed on
both sides of the diaphragm disposed between the first sheet magnet and the second sheet
magnet, and the voice coil is formed on both sides according to the assumed impedance. Are
connected in series or in parallel.
[0011]
According to the present invention, voice coils are formed on both sides of the diaphragm
disposed between the first sheet magnet and the second sheet magnet, and the voice coils on
both sides are connected in series or in accordance with the assumed impedance. Since it is
configured to be connected in parallel, it is possible to obtain the desired impedance without
excessively narrowing or thickening the voice coil conductor, and as a result, sufficient sound
pressure can be obtained. There is an effect that can be secured.
[0012]
Embodiment 1
FIG. 1 is a block diagram showing an electromagnetic converter according to Embodiment 1 of
the present invention. In the figure, the front case 1 and the rear case 2 are provided with a front
magnet 3, a rear magnet 4, buffer sheets 5a and 5b and a flexible substrate. 6 is stored.
In the front magnet 3, the S pole and the N pole are alternately arranged at the same interval in a
stripe shape.
In the rear magnet 4, the S pole and the N pole are alternately arranged at the same interval in a
stripe shape. However, the S pole in the front magnet 3 and the S pole in the rear magnet 4 are
arranged to face each other, and the N pole in the front magnet 3 and the N pole in the rear
magnet 4 are arranged to face each other. The front magnet 3 constitutes a first sheet magnet,
and the rear magnet 4 constitutes a second sheet magnet.
[0013]
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The buffer sheet 5 a is inserted between the front magnet 3 and the flexible substrate 6 in order
to reduce noise generated when the flexible substrate 6 hits the front magnet 3. The buffer sheet
5 b is inserted between the rear magnet 4 and the flexible substrate 6 in order to reduce noise
generated when the flexible substrate 6 collides with the rear magnet 4.
[0014]
The flexible substrate 6 is disposed between the buffer sheet 5a and the buffer sheet 5b, and
voice coils to which an electric signal is applied are formed on both sides (in FIG. 1, only the
voice coil 7a formed on the upper surface is visible). The voice coil 7b formed on the lower
surface is not visible), and the voice coils 7a and 7b are connected in series or in parallel. The
flexible substrate 6 constitutes a diaphragm. The voice coils 7a and 7b are conductor patterns in
a meandering shape, and are formed at positions facing the center (the neutral zone of
magnetization) of the gap between the S pole and the N pole in the front magnet 3 and the rear
magnet 4. Further, the widths of the conductors of the voice coils 7a and 7b are the same.
[0015]
Next, the operation will be described. When a current, which is an electrical signal, flows through
the voice coils 7a and 7b formed on the flexible substrate 6, the multipolar magnetization
patterns of the voice coils 7a and 7b, the front magnet 3 and the rear magnet 4 act
electromagnetically. In the flexible substrate 6, when the multipole magnetization pattern of the
voice coils 7a and 7b, the front magnet 3 and the rear magnet 4 acts electromagnetically, voice
vibration is received under vertical force according to Fleming's left-hand rule. Occur. The sound
vibration generated from the flexible substrate 6 is radiated to the outside through sound
radiation holes formed in the front magnet 3 and the front case 1.
[0016]
Here, FIG. 2 (a) is an explanatory view showing the position of the magnet and the magnitude of
the magnetic flux density in the electromagnetic converter according to Embodiment 1 of the
present invention. FIG. 2B is an explanatory view showing the position of the magnet and the
position of the voice coil in the electromagnetic converter according to the first embodiment of
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the present invention. The electromagnetic converter shown in FIG. 1 is arranged so that the
magnet and the case are vertically opposed to each other with the flexible substrate 6 at the
center, but in FIG. 2 the front case 1 and the front magnet 3 will be described for convenience of
explanation. The rear magnet 4 and the rear case 2 which are disposed under the flexible
substrate 6 are omitted. In FIG. 2, the symbol A represents the direction of the magnetic flux, and
the symbol B represents the magnitude of the magnetic flux density in absolute value.
[0017]
In the rear magnet 4 in which strip-like different magnetic poles (S and N poles) are alternately
arranged at the same interval, the location where the magnetic flux density in the horizontal
direction is the largest is the gap between the different magnetic poles, ie It is a part called the
neutral zone of magnetization. When the magnetic flux density in the neutral zone is measured,
the width of the horizontal surface having a magnetic flux density of 80% or more of the
maximum magnetic flux density is, for example, about 1 mm from the center of the neutral zone
(magnetic flux density From the measurement results, it is obtained from the measurement
results that the range of 0.5 mm on the S pole side and 0.5 mm on the N pole side with respect to
the maximum point of. Therefore, if the voice coils 7a and 7b consisting of a meander-shaped
conductor pattern are properly disposed at a position of ± 0.5 mm or less from the center of the
neutral zone, the electrical signal as the input signal is efficiently converted into an audio signal.
It will be possible.
[0018]
In the example of FIG. 2, the voice coil 7a formed on the upper surface of the flexible substrate 6
and the voice coil 7b formed on the lower surface are distributed around the peak point of the
magnetic flux density (the point where the magnetic flux density is the largest). There is.
Therefore, if the voice coils 7a and 7b are formed on the flexible substrate 6 as shown in FIG. 2,
the voice coils 7a and 7b can be arranged at positions having a magnetic flux density of 80% or
more of the maximum magnetic flux density.
[0019]
3A shows the upper surface and the A-A ′ cross section of the flexible substrate 6, and FIG. 3B
is an explanatory view showing the lower surface of the flexible substrate 6. FIG. 4 is an
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interlayer connection diagram showing a state in which the voice coil 7a formed on the upper
surface 6a of the flexible substrate 6 and the voice coil 7b formed on the lower surface 6b are
connected in parallel. In FIGS. 3 and 4, the first signal input end 8a of the voice coil 7a is
connected to the first signal input end 9a of the voice coil 7b, and the second signal input end 8b
of the voice coil 7a is a voice coil It is connected to the second signal input terminal 9b of 7b.
Further, a first signal input terminal 10a for applying an electric signal is connected to a first
signal input end 8a of the voice coil 7a, and an electric signal is applied to a second signal input
end 9b of the voice coil 7b. The second signal input terminal 10b is connected.
[0020]
As shown in FIG. 4, when the voice coil 7a and the voice coil 7b are connected in parallel, a voice
coil (a voice having the same width as that of the voice coils 7a and 7b is formed on either the
upper surface 6a or the lower surface 6b of the flexible substrate 6). This is suitable for the case
where the desired impedance in the electromagnetic converter is low because the overall
impedance of the voice coil is lower than in the case where the coil is formed. For example, when
the impedance of the voice coil 7a and the voice coil 7b is 3Ω, the impedance of the entire voice
coil is an impedance of approximately 1.5Ω. In order to reduce the impedance, it is usually
conceivable to widen the width of the voice coil or to increase the thickness of the conductor of
the voice coil. The method of increasing the thickness of the conductor needs to consider the
influence of the sound quality and the sound pressure due to the material of the commercially
available flexible substrate or the change of the thickness of the conductor, and the degree of
freedom is low. If the width of the voice coil is increased, the electrical signal flows also to the
point out of the point where the neutral magnetic flux is concentrated between the magnetic
poles, so that the electrical signal can not be efficiently converted into the audio signal.
Therefore, the voice coils 7a and 7b are provided on both sides of the flexible substrate 6, and
the voice coils 7a and 7b on both sides are disposed at locations where the magnetic flux is not
attenuated from the neutral zone between the magnetic poles. By connecting them, the voice
coils 7a and 7b are arranged at the locations where the magnetic fluxes of the neutral zone are
concentrated, and the electric signal is efficiently converted into an audio signal.
[0021]
FIG. 5A shows the upper surface and the B-B ′ cross section of the flexible substrate 6, and FIG.
5B is an explanatory view showing the lower surface of the flexible substrate 6. FIG. 6 is an
interlayer connection diagram showing a state in which the voice coil 7a formed on the upper
surface 6a of the flexible substrate 6 and the voice coil 7b formed on the lower surface 6b are
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connected in series. In FIGS. 5 and 6, the second signal input end 8b of the voice coil 7a is
connected to the first signal input end 9a of the voice coil 7b. Further, a first signal input
terminal 10a for applying an electric signal is connected to a first signal input end 8a of the voice
coil 7a, and an electric signal is applied to a second signal input end 9b of the voice coil 7b. The
second signal input terminal 10b is connected. Reference numeral 22 denotes a jumper wire for
connecting the voice coil 7a and the voice coil 7b.
[0022]
As shown in FIG. 6, when the voice coil 7a and the voice coil 7b are connected in series, one of
the upper surface 6a or the lower surface 6b of the flexible substrate 6 has a voice coil (a voice
having the same width as that of the voice coils 7a and 7b). Since the impedance of the entire
voice coil is higher than in the case of forming a coil, it is suitable when the desired impedance in
the electromagnetic converter is high. For example, when the impedance of the voice coil 7a and
the voice coil 7b is 3Ω, the impedance of the entire voice coil is an impedance of approximately
6Ω.
[0023]
As apparent from the above, according to the first embodiment, the voice coils 7a and 7b are
formed on both sides of the flexible substrate 6 disposed between the front magnet 3 and the
rear magnet 4, and the voice coils 7a, 7b are configured to be connected in series or in parallel.
That is, when the desired impedance is large, the width of the voice coils 7a and 7b provided on
either the upper surface 6a or the lower surface 6b of the flexible substrate 6 is narrowed to
obtain the desired impedance. The voice coils 7a and 7b of double width are disposed on both
sides (upper surface 6a and lower surface 6b) of the flexible substrate 6, and when the voice coils
7a and 7b on both sides are connected in series, the coils are wound with the same impedance.
As the number is doubled, not only the effect of efficiently converting the input electric signal
into a voice signal is obtained, but also the target impedance can be obtained without excessively
narrowing the width of the conductors of the voice coils 7a and 7b. The effect is to be able to
Further, when the desired impedance is small, the width of the voice coil 7a or 7b of either the
upper surface 6a or the lower surface 6b of the flexible substrate 6 is increased to obtain the
desired impedance. The voice coils 7a and 7b having a width of 1/2 are disposed on both sides
(upper surface 6a and lower surface 6b) of the second one and connecting the voice coils 7a and
7b on both sides in parallel is a place where magnetic flux concentrates in the neutral zone. Since
the voice coils 7a and 7b can be arranged in a concentrated manner, an effect can be obtained
that the input electric signal can be efficiently converted into an audio signal.
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[0024]
Second Embodiment In the first embodiment, the voice coil 7a formed on the upper surface 6a of
the flexible substrate 6 and the voice coil 7b formed on the lower surface 6b are connected in
series or in parallel. A voice coil may be formed in each layer of the flexible substrate 6 in
multiple layers, and the voice coil of each layer may be connected in series or in parallel, and the
same effect as that of the first embodiment can be obtained.
[0025]
FIG. 7 is an explanatory view showing a case where the flexible substrate 6 of the
electromagnetic converter according to Embodiment 2 of the present invention is formed of
three layers. In the figure, the voice coil 7 c is a meandering conductor pattern formed on the
first third layer 6 c 1 which is the upper surface layer of the flexible substrate 6. The voice coil 7
d is a meandering conductor pattern formed in the second-third layer 6 c 2 which is the inner
layer of the flexible substrate 6. The voice coil 7 e is a meandering conductor pattern formed in
the third layer 6 c 3 which is the lower surface layer of the flexible substrate 6. Similarly to the
voice coils 7a and 7b in the first embodiment, the voice coils 7c, 7d and 7e are located at the
center of the gap between the S pole and the N pole in the front magnet 3 and the rear magnet 4
(neutral zone of magnetization). The conductors of the voice coils 7c, 7d, 7e are formed at the
opposite positions and have the same width.
[0026]
FIG. 8 shows the voice coil 7c formed in the first third layer 6c1 of the flexible substrate 6, the
voice coil 7d formed in the second third layer 6c2, and the third third layer 6c3. FIG. 6 is an
interlayer connection diagram showing a state in which the voice coil 7 e is connected in parallel.
In FIG. 8, the first signal input end 11a of the voice coil 7c is connected through a through hole
to the first signal input end 12a of the voice coil 7d and the first signal input end 13a of the voice
coil 7e, The second signal input end 11b of the voice coil 7c is connected to the second signal
input end 12b of the voice coil 7d and the second signal input end 13b of the voice coil 7e via a
through hole. Further, a first signal input terminal 10a for applying an electric signal is
connected to a first signal input end 11a of the voice coil 7c, and an electric signal is applied to a
second signal input end 11b of the voice coil 7c. The second signal input terminal 10b is
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connected.
[0027]
As shown in FIG. 8, when the voice coil 7c, the voice coil 7d, and the voice coil 7e are connected
in parallel, for example, the width of the voice coil (voice coil 7c, 7d, 7e is the same as that of the
voice coil 7c, 7d, 7e) is This is suitable for the case where the desired impedance in the
electromagnetic converter is low because the impedance of the entire voice coil is lower than in
the case of forming the voice coil. For example, when the impedance of the voice coil 7c, the
voice coil 7d, and the voice coil 7e is 3 Ω, the impedance of the entire voice coil is an impedance
of approximately 1 Ω.
[0028]
FIG. 9 is an explanatory view showing a case where a flexible substrate 6 of an electromagnetic
converter according to Embodiment 2 of the present invention is formed of three layers. In FIG.
10, the voice coil 7c formed in the first third layer 6c1 of the flexible substrate 6, the voice coil
7d formed in the second third layer 6c2, and the third third layer 6c3 FIG. 5 is an interlayer
connection diagram showing a state in which a voice coil 7e is connected in series. 9 and 10, the
second signal input end 11b of the voice coil 7c is connected to the first signal input end 12a of
the voice coil 7d through the through hole 15, and the second signal of the voice coil 7d The
input end 12 b is connected to the first signal input end 13 a of the voice coil 7 e via the through
hole 14. Further, a first signal input terminal 10a for applying an electrical signal is connected to
a first signal input end 11a of the voice coil 7c, and an electrical signal is applied to a second
signal input end 13b of the voice coil 7e. The second signal input terminal 10b is connected.
[0029]
As shown in FIG. 10, when the voice coil 7c, the voice coil 7d, and the voice coil 7e are connected
in series, for example, the width of the voice coil (the voice coil 7c, 7d, 7e and the conductor are
the same on Since the overall impedance of the voice coil is higher than in the case of forming
the voice coil, it is suitable when the desired impedance in the electromagnetic converter is high.
For example, when the impedance of the voice coil 7c, the voice coil 7d, and the voice coil 7e is
3Ω, the impedance of the entire voice coil is approximately 9Ω.
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[0030]
As apparent from the above, according to the second embodiment, in addition to the effect of the
first embodiment, the flexible substrate 6 is multilayered, and the voice coils 7c, 7d, 7e are
formed in each layer of the flexible substrate 6. Since the voice coils 7c, 7d and 7e of each layer
are connected in series or in parallel, the target impedance can be set without excessively
narrowing or thickening the width of the conductors of the voice coils 7c, 7d, 7e. It produces an
effect that can be obtained.
[0031]
In the second embodiment, although the flexible substrate 6 is composed of three layers, the
number of layers of the flexible substrate 6 is not limited to three, and, for example, four flexible
substrates 6, Alternatively, a voice coil may be formed in each layer, and the voice coil of each
layer may be connected in series or in parallel.
[0032]
Third Embodiment
In the second embodiment, the voice coil 7c, the voice coil 7d, and the voice coil 7e are all
connected in series, or the voice coil 7c, the voice coil 7d, and the voice coil 7e are all connected
in parallel. The voice coils of some layers may be connected in parallel, and the voice coils
connected in parallel may be connected in series with the voice coils of the remaining layers.
[0033]
FIG. 11 shows a state in which the voice coil 7c and the voice coil 7d are connected in parallel,
and the voice coils 7c and 7d and the voice coil 7e connected in parallel are connected in series.
That is, the first signal input end 11a of the voice coil 7c is connected to the first signal input end
12a of the voice coil 7d through the through hole, and the second signal input end 11b of the
voice coil 7c is through The second signal input end 12b of the voice coil 7d is connected to the
second signal input end 12b of the voice coil 7d through a hole, and the first signal input end
13a of the voice coil 7e is connected. Further, a first signal input terminal 10a for applying an
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electrical signal, which is an electrical signal, is connected to a first signal input end 11a of the
voice coil 7c, and a second signal input end 13b of the voice coil 7e is connected. A second signal
input terminal 10b for applying an electrical signal is connected.
[0034]
As shown in FIG. 11, when the voice coil 7c and the voice coil 7d are connected in parallel, and
the voice coils 7c and 7d and the voice coil 7e connected in parallel are connected in series, more
than the cases according to the first and second embodiments. The range of impedance can be
expanded, and it is possible to flexibly meet the required specifications. For example, when the
impedance of the voice coil 7c, the voice coil 7d, and the voice coil 7e is 3Ω, the impedance of
the entire voice coil is an impedance of approximately 4.5Ω.
[0035]
As apparent from the above, according to the third embodiment, in addition to the effects of the
first and second embodiments, voice coils of some layers are connected in parallel, and the voice
coils of the parallel connection are The series connection with the voice coil of the layer is
performed, so that the target impedance can be obtained without excessively reducing the width
of the conductors of the voice coils 7c, 7d and 7e.
[0036]
Fourth Embodiment
Although in the first embodiment, the voice coil 7a formed on the upper surface 6a of the flexible
substrate 6 and the voice coil 7b formed on the lower surface 6b are connected in series or in
parallel, the voice coil 7a and A series-parallel switching unit may be provided to switch the
connection between the voice coils 7b.
[0037]
FIG. 12 is an interlayer connection diagram showing a state in which the voice coil 7a formed on
the upper surface 6a of the flexible substrate 6 and the voice coil 7b formed on the lower surface
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6b are connected in parallel. In the figure, when the switch 21a connects the voice coil 7a and
the voice coil 7b in parallel (contact "1" side in the figure), the first signal input end 8a of the
voice coil 7a and the first of the voice coil 7b When the signal input end 9a is connected to the
signal input terminal 10a and the voice coil 7a and the voice coil 7b are connected in series
(contact "2" side in the figure), the second signal input end 8b of the voice coil 7a and the voice A
process of connecting the first signal input end 9a of the coil 7b is performed. The changeover
switch 21b is a switch that switches the contact in conjunction with the changeover switch 21a,
and when the voice coil 7a and the voice coil 7b are connected in parallel (contact "1" side in the
figure), the switch 21b When the second signal input end 8b and the second signal input end 9b
of the voice coil 7b are connected to the signal input terminal 10b, and the voice coil 7a and the
voice coil 7b are connected in series (contact "2" side in the figure) And a process of
disconnecting the connection between the second signal input end 8b of the voice coil 7a and the
signal input terminal 10b. The changeover switch 21a and the changeover switch 21b constitute
a series-parallel switching means.
[0038]
Next, the operation will be described. When the voice coil 7a and the voice coil 7b are connected
in parallel, the connection destination of the changeover switch 21a and the changeover switch
21b is switched to the contact "1" side, and the connection form is the same as the
electromagnetic converter of FIG. On the other hand, when the voice coil 7a and the voice coil 7b
are connected in series, the connection destination of the changeover switch 21a and the
changeover switch 21b is switched to the contact "2" side, and the connection form is the same
as the electromagnetic converter of FIG. The changeover switch 21a and the changeover switch
21b are interlocked, and are simultaneously switched to the "1" side or the "2" side.
[0039]
For example, when the impedance of the voice coil 7a and the voice coil 7b is 3Ω, if the voice
coil 7a and the voice coil 7b are connected in parallel, the impedance of the entire voice coil
becomes approximately 1.5Ω, and the voice coil 7a and If the voice coil 7b is connected in series,
the impedance of the entire voice coil is approximately 6 Ω.
[0040]
As apparent from the above, according to the fourth embodiment, the connection form between
the voice coil 7a formed on the upper surface 6a of the flexible substrate 6 and the voice coil 7b
formed on the lower surface 6b is switched. Since the changeover switches 21a and 21b are
provided, it is possible to change the impedance only by switching the connection destination of
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the changeover switches 21a and 21b, and it is possible to expand the use range of the
electromagnetic converter. .
[0041]
Embodiment 5
FIG. 13 is an explanatory view for explaining a method of connecting the voice coil 7a formed on
the upper surface 6a of the flexible substrate 6 and the voice coil 7b formed on the lower surface
6b.
That is, FIG. 13 shows a method of connecting the voice coil 7a formed on the upper surface 6a
and the voice coil 7b formed on the lower surface 6b without using a through hole or a jumper
wire. In the figure, the first signal input end 31a is an end of the voice coils 7a and 7b formed on
the upper surface 6a and the lower surface 6b of the flexible substrate 6, and the first signal
input end 8a of the voice coils 7a and 7b This is a signal input terminal corresponding to 9a. The
second signal input end 31b is an end of the voice coil 7a, 7b formed on the upper surface 6a
and the lower surface 6b of the flexible substrate 6, and corresponds to the second signal input
end 8b, 9b of the voice coil 7a, 7b. Signal input terminal. The first signal input end 31a and the
second signal input end 31b are processed into a lead wire shape, and are connected to the
terminal board 32 by soldering or the like.
[0042]
FIG. 14 is an explanatory view showing an example of processing a part of the flexible substrate
6 of FIG. 13 into a lead shape. FIG. 14A shows a state in which the flexible substrate 6 is
processed, and a T-shaped notch 33 is formed on the signal input end of the flexible substrate 6.
In FIG. 14 (b), by forming T-shaped notches 33 in the first and second signal input ends of the
flexible substrate 6, the lead-shaped signal input ends 31a and 31b are bent at about 90 degrees.
It shows how it is.
[0043]
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FIG. 15 is a detailed view showing the connection of the signal input end of the flexible substrate
6. FIG. 15 shows an example in which the signal input terminals 31a and 31b in the form of leads
are connected to the terminal plate 32. In FIG. 15, a lug terminal 32a of the terminal plate 32 is a
terminal for connecting a conducting wire from the outside, and an eyelet 32b is a member for
fixing the terminal plate 32 and the lug terminal 32a. The eyelet 32 c is a member for fixing the
terminal plate 32 to the front case 1.
[0044]
The lead signal input terminals 31a and 31b are passed through the holes of the eyelet 32b of
the terminal plate 32, and are electrically connected to the eyelet 32b by soldering or the like. At
this time, the voice coils 7a and 7b formed on the upper surface 6a and the lower surface 6b of
the flexible substrate 6 are arranged in parallel by fixing the signal input ends 31a and 31b in
the form of lead wires to the terminal plate 32 by soldering or the like. Connected
[0045]
As apparent from the above, according to the fifth embodiment, the signal input end of the voice
coil formed on the flexible substrate 6 is processed into a lead shape, and the signal input end
processed into the lead shape is a terminal Since it is configured to be connected to the plate 32,
the voice coil 7a formed on the upper surface 6a and the voice coil 7b formed on the lower
surface 6b can be connected without using a through hole or a jumper wire. As a result, since
processing with a through hole or a jumper wire is not necessary, the working efficiency at the
time of assembly can be enhanced.
[0046]
It is a block diagram which shows the electromagnetic converter by Embodiment 1 of this
invention.
(A) is explanatory drawing which shows the position of the magnet in the electromagnetic
converter by Embodiment 1 of this invention, and the magnitude | size of magnetic flux density,
(b) is the position of the magnet in the electromagnetic converter by Embodiment 1 of this
invention, It is explanatory drawing which shows the position of a voice coil. (A) is an explanatory
view showing the upper surface and the AA 'cross section of the flexible substrate 6 in which the
voice coil 7a is formed, (b) is an explanatory diagram showing the lower surface of the flexible
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substrate 6 in which the voice coil 7b is formed is there. FIG. 13 is an interlayer connection
diagram showing a state in which a voice coil 7a formed on the upper surface 6a of the flexible
substrate 6 and a voice coil 7b formed on the lower surface 6b are connected in parallel. (A) is an
explanatory view showing the upper surface and the BB 'cross section of the flexible substrate 6
in which the voice coil 7a is formed, (b) is an explanatory diagram showing the lower surface of
the flexible substrate 6 in which the voice coil 7b is formed is there. FIG. 6 is an interlayer
connection diagram showing a state in which a voice coil 7a formed on the upper surface 6a of
the flexible substrate 6 and a voice coil 7b formed on the lower surface 6b are connected in
series. It is explanatory drawing which shows the case where the flexible substrate 6 of the
electromagnetic converter by Embodiment 2 of this invention is comprised by three layers. The
voice coil 7c formed in the first third layer 6c1 of the flexible substrate 6, the voice coil 7d
formed in the second third layer 6c2, and the voice coil 7e formed in the third third layer 6c3
And are connected in parallel. It is explanatory drawing which shows the case where the flexible
substrate 6 of the electromagnetic converter by Embodiment 2 of this invention is comprised by
three layers. The voice coil 7c formed in the first third layer 6c1 of the flexible substrate 6, the
voice coil 7d formed in the second third layer 6c2, and the voice coil 7e formed in the third third
layer 6c3 And are connected in series. FIG. The voice coil 7c formed in the 1 / 3rd layer 6c1 of
the flexible substrate 6 and the voice coil 7d formed in the 2 / 3rd layer 6c2 are connected in
parallel, and the voice coils 7c and 7d and the 3 / 3rd layer are connected It is an interlayer
connection diagram showing a state in which a voice coil 7e formed in 6c3 is connected in series.
FIG. 13 is an interlayer connection diagram showing a state in which a voice coil 7a formed on
the upper surface 6a of the flexible substrate 6 and a voice coil 7b formed on the lower surface
6b are connected in parallel. It is explanatory drawing explaining the connection method of the
voice coil 7a currently formed in the upper surface 6a of the flexible substrate 6, and the voice
coil 7b formed in the lower surface 6b.
It is explanatory drawing which shows an example which processes a part of flexible substrate 6
of FIG. 13 in lead wire shape. FIG. 6 is a detail view showing connection of a signal input end of
the flexible substrate 6;
Explanation of sign
[0047]
DESCRIPTION OF SYMBOLS 1 front case, 2 rear case, 3 front magnet (1st sheet magnet), 4 rear
magnet (2nd sheet magnet), 5a, 5b buffer sheet, 6 flexible substrate (diaphragm), 6c1 1 of
flexible substrate 6 / 3rd layer, 6c2 2 / 3rd layer of flexible substrate 6, 3c 3rd layer of 6c3
flexible substrate 6, 7a, 7b, 7c, 7d, 7e voice coil, 8a 1st signal input end of voice coil 7a , 8b
Voice coil 7a second signal input end 9a Voice coil 7b first signal input end 9b Voice coil 7b
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second signal input end 10a signal input terminal 10b signal input terminal 11a voice coil First
signal input end of 7c, second signal input end of 11b voice coil 7c, first signal of 12a voice coil
7d Input end, second signal input end of 12b voice coil 7d, first signal input end of 13a voice coil
7e, second signal input end of 13b voice coil 7e, 14, 15 through holes, 21a, 21b changeover
switch (Series / parallel switching means), 22 jumper wires, first signal input end of 31a voice
coil, second signal input end of 31b voice coil, 32 terminal plates, 32a lug terminals, 32b, 32c
eyelet, 33 T shape Cut of.
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