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JP2010226330

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DESCRIPTION JP2010226330
An electromagnetic transducer is provided that can efficiently receive the magnetic flux of a
permanent magnet, obtain a necessary driving force with an inexpensive permanent magnet, and
improve the rigidity of a diaphragm. A strip-shaped permanent magnet 10 is disposed so as to
have a predetermined gap 11 and alternately have different polarities, and a convex bending
portion 21a is formed along a predetermined direction of a base material, and a convex is
formed. The vibrating membrane 20 has the coil 22 formed on the surface of the bending
portion 21a and the convex bending portion 21a is disposed in the gap 11 between the different
polarities of the permanent magnet 10 and the permanent magnet 10. And a supporting frame
30. [Selected figure] Figure 2
Electromagnetic converter
[0001]
The present invention relates to an electromagnetic converter that reproduces an audio signal by
combining, for example, a permanent magnet and a vibrating membrane.
[0002]
With regard to an electromagnetic transducer combining a permanent magnet and a vibrating
membrane, for example, according to Patent Document 1, a permanent magnet plate and a
vibrating membrane arranged to face the permanent magnet plate, and the permanent magnet
plate and the vibrating membrane And a buffer member disposed between the two.
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The permanent magnet plate has a multi-pole magnetization pattern in which strip-like different
magnetic poles are alternately formed at a constant interval, and the vibrating film is a gap
portion between the different magnetic poles of the permanent magnet plate. A coil made of a
meander-shaped conductor pattern is formed on the entire surface at a position opposite to a
portion called a neutral zone of so-called magnetization.
[0003]
Thus, when current (audio signal) flows through the coil of the diaphragm, the coil and the
multipolar magnetization pattern of the permanent magnet plate are electromagnetically
coupled, and audio vibration is generated in the diaphragm according to the law of Fleming.
[0004]
The above-mentioned permanent magnet plate, vibrating membrane and buffer member are
covered by a metal frame and attached to the speaker housing, and sound waves generated by
this audio vibration are radiated through radiation holes provided in the permanent magnet plate
and the metal frame Audio playback.
[0005]
In such an electromagnetic converter, the magnets are disposed to sandwich the vibrating film,
and the leakage flux of the magnet is used, so the efficiency is low.
Therefore, in order to increase the magnetic flux density necessary to drive the vibrating film in
order to obtain sufficient sound pressure, a magnet having a large maximum energy product
(BHmax) such as a neodymium iron boron magnet is used.
[0006]
Patent No. 3192372 (Unexamined-Japanese-Patent No. 9-331596)
[0007]
However, the above-described conventional electromagnetic converter has a problem that the
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2
efficiency is low because the driving force of the vibrating film is obtained by the leakage flux of
the permanent magnet.
Further, since an expensive permanent magnet such as a neodymium iron boron magnet is used
to obtain a large driving force, there is a problem that the electromagnetic converter configured
by the magnetic circuit using this permanent magnet is expensive.
In addition, since the vibrating film is thin and low in rigidity, there is a problem that a loss of
sound pressure level occurs due to the divided resonance.
[0008]
The present invention has been made to solve the above-mentioned problems, and can efficiently
receive the magnetic flux of a permanent magnet, obtain the necessary driving force even with an
inexpensive permanent magnet, and improve the rigidity of the diaphragm. The purpose is to
obtain an electromagnetic converter.
[0009]
In the electromagnetic converter according to the present invention, a strip-like permanent
magnet disposed so as to have a predetermined gap and alternately having different polarities is
formed, and a convex bending portion is formed along a predetermined direction of the
substrate. A vibrating membrane in which a coil is formed on the surface of a convex bending
portion, and the convex bending portion is disposed in a gap between different polarities of the
permanent magnet, and a frame that accommodates the permanent magnet and supports the
vibrating membrane It is
[0010]
According to the electromagnetic converter in accordance with the present invention, the convex
bending portion formed along the predetermined direction of the base material of the vibrating
film and having the coil formed on the surface is disposed in the gap between the permanent
magnets By configuring, the coil can receive a large magnetic flux density from the permanent
magnet, and the necessary magnetic flux density can be obtained even with an inexpensive
permanent magnet.
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Further, by forming the projection by bending the vibrating film, the cross section coefficient of
the vibrating film is increased, the rigidity of the vibrating film is improved, and the loss of the
sound pressure level can be suppressed.
[0011]
It is a figure which shows the whole structure of the electromagnetic transducer of this invention,
and (a) is an exploded perspective view, (b) It is a side view.
FIG. 2 is a cross-sectional view taken along the line A-A showing the configuration of the
electromagnetic converter according to the first embodiment. FIG. 7 is a cross-sectional view
along line AA showing another configuration of the electromagnetic converter according to the
first embodiment. FIG. 7 is a cross-sectional view along line AA showing another configuration of
the electromagnetic converter according to the first embodiment. FIG. 7 is a cross-sectional view
along line AA showing another configuration of the electromagnetic converter according to the
first embodiment. FIG. 7 is a cross-sectional view taken along the line A-A showing a
configuration of an electromagnetic converter according to Embodiment 2.
[0012]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. Embodiment 1 FIG. 1 is a view for showing the entire configuration of the
electromagnetic converter of the present invention, FIG. 1 (a) is an exploded perspective view of
the electromagnetic converter, and FIG. 1 (b) is a side view of the electromagnetic converter. .
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 showing the configuration of the
electromagnetic converter according to the first embodiment.
[0013]
The configuration of the electromagnetic converter 1 of the first embodiment will be described.
As shown in FIGS. 1 (a) and 1 (b), the electromagnetic converter 1 roughly includes a permanent
magnet 10, a vibrating membrane 20, and a frame 30, and the permanent magnet 10 is between
the vibrating membrane 20 and the frame 30. It is housed and configured to be sandwiched
between.
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[0014]
The permanent magnet 10 is a strip magnet having a rectangular cross section, and is disposed
so that the polarities are alternately different, and has a predetermined gap as a magnetic gap
(hereinafter referred to as a gap) 11 as shown in FIG.
[0015]
The vibrating film 20 is formed of, for example, a rectangular sheet in which a coil 22 is formed
on the surface of a thin and flexible resin film as a base material.
In the longitudinal direction of the vibrating membrane 20, a bent portion 21a bent so that the
surface facing the permanent magnet 10 is convex is formed, and the cross section of the bent
portion 21a is V-shaped. A coil 22 is formed on the surface of the bent portion 21a, and the coil
22 is formed by, for example, a method of printing in the same manner as FPC (Flexible Printed
Circuits), a method of winding a thin wire conductor, or the like.
[0016]
The V-shaped bent portion 21a formed in the vibrating membrane 20 is disposed in the gap 11
between the permanent magnets 10, and the strong magnetic flux generated between the
permanent magnets 10 by the coil 22 formed in the bent portion 21a. In the position to receive
Further, in order to fix the vibrating membrane 20 to the frame 30 without disturbing the
vibration of the vibrating membrane 20, an edge 23 having a semicircular cross section is
formed along the outer periphery of the vibrating membrane 20.
[0017]
The frame 30 has a substantially rectangular parallelepiped shape, and one surface of the frame
30 is covered with the vibrating film 20. The permanent magnet 10 is adhered and fixed to the
inner surface facing the vibrating membrane 20, and the sound emission holes 31 are formed at
positions corresponding to the intervals of the permanent magnets 10.
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[0018]
Next, the operation of the electromagnetic converter 1 will be described. When a current as an
audio signal is supplied from the control unit (not shown) to the coil 22 of the bent portion 21a
of the diaphragm 20, the current flowing through the coil 22 and the magnetic flux generated in
the gap 11 between the permanent magnets 10 are electromagnetically coupled. The diaphragm
20 is driven back and forth (vertically in FIG. 2) according to Fleming's law to generate audio
vibration. The generated audio vibration is emitted to the outside of the electromagnetic
converter 1 through the sound emission holes 31 of the frame 30.
[0019]
At this time, when a flat diaphragm is used on the entire surface, split resonance occurs and the
sound pressure level is lost, but the diaphragm 20 has a thin and flexible sheet-like cross section
by forming the convex bending portion 21a. Since the rigidity is improved by raising the
coefficient, the divided resonance is damped to suppress the loss of the sound pressure level.
[0020]
As described above, in the electromagnetic transducer 1 of the first embodiment, the bending
portion 21a having the convex bending portion 21a formed along the predetermined direction of
the vibrating membrane 20 and the coil 22 formed on the surface thereof is a permanent magnet
10 By arranging the coil 22 in the gap 11 between them, the coil 22 can receive the magnetic
flux at the portion where the magnetic flux density between the permanent magnets 10 is high.
As a result, it is possible to obtain the required magnetic flux density even if using an inexpensive
ferrite magnet, and to obtain the necessary magnetic flux density inexpensively by reducing the
magnet volume even with an expensive magnet such as a neodymium iron boron magnet it can.
Further, by forming the bending portion 21a, the section coefficient of the vibrating membrane
20 can be increased to improve the rigidity, so that the division resonance of the thin vibrating
membrane 20 can be suppressed to reduce the loss of the sound pressure level. it can.
[0021]
In the first embodiment, the cross-sectional shape of the convex bending portion 21a is described
as V-shaped, but as shown in FIGS. 3, 4 and 5, the bending portion 21b having a U-shaped cross-
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sectional shape, the cross-section The bending portion 21c having a rectangular shape and the
bending portion 21d having an I-shaped cross-sectional shape may be used, and the same effect
as the electromagnetic converter 1 of the first embodiment can be obtained even with these
cross-sectional shapes. it can.
[0022]
Second Embodiment
In the electromagnetic converter 1 of the first embodiment, the configuration in which the
convex bending portion 21a is formed on one surface of the vibrating film 20 has been
described, but in the second embodiment, the convex bending on both surfaces of the vibrating
film 20 is described. The structure which formed the part 21a is demonstrated. FIG. 6 is a crosssectional view showing the configuration of the electromagnetic converter 1 of the second
embodiment. In addition, about the same structure as FIGS. 1-5, the same code | symbol is
attached | subjected and the detailed description is abbreviate | omitted.
[0023]
As shown in FIG. 6, the electromagnetic transducer 1 supports the vibrating membrane 20 so as
to sandwich the vibrating membrane 20 by the outer edge of the casing consisting of the upper
and lower frames 30, and The permanent magnet 10 is adhesively fixed.
[0024]
The permanent magnet 10 is disposed so that the polarities are alternately different as in the
first embodiment, and a predetermined gap is provided as a gap, and convex bending portions 21
a are permanent magnets 10 on both surfaces of the diaphragm 20. Are formed to be disposed in
the gap 11 between them.
[0025]
As described above, in the electromagnetic converter 1 of the second embodiment, the coils 22 of
the convex bending portion 21 a formed on both surfaces of the vibrating membrane 20 are
disposed in the gap 11 between the permanent magnets 10 of the upper and lower frames 30.
Thus, the same effect as that of the first embodiment can be obtained.
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Further, by covering the vibrating membrane 20 so as to be sandwiched by the frame 30 from
the vertical direction of the vibrating membrane 20, the vibrating membrane 20 can also be
protected.
[0026]
In the second embodiment, the bending portion 21a having a V-shaped cross section is
described. However, as in the first embodiment, the bending portions 21b, 21c, and 21d having
different cross sectional shapes may be used. You can get the effect of
[0027]
1 electromagnetic transducer, 10 permanent magnets, 11 gaps, 20 diaphragms, 21a, 21b, 21c,
21d bent parts, 22 coils, 23 edges, 30 frames, 31 sound emitting holes.
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