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JPH057396

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DESCRIPTION JPH057396
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic induction type speaker used for various audio equipment, video equipment and
the like.
[0002]
2. Description of the Related Art In recent years, high-quality sources (CD, DAT, etc.) over the
entire audio band have been put to practical use by digitization of audio equipment, but speakers
that convert music signals from electrical signals to audio outputs are The input of the signal is
directly given to the voice coil which is a drive system.
[0003]
At present, the most common speaker (electro-acoustic conversion system) is an electrodynamic
speaker using a permanent magnet, but this electrodynamic speaker is composed of a magnetic
circuit having a permanent magnet and a magnetic gap, When a voice coil held by a damper and
a diaphragm is inserted into the magnetic gap and an input current is applied to this voice coil,
Lorentz force is generated between the magnetic flux in the magnetic gap and the current
flowing in the voice coil and through the voice coil A driving force acts on the diaphragm to
generate a sound wave.
[0004]
At present, a method of applying direct input to a voice coil which is a drive system is currently
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the means of electrical input to the electrodynamic speaker.
[0005]
On the other hand, the electromagnetic induction type speaker is fixed to the side wall of the
center pole or magnet and gives an electric input to a coil of two or more turns composed of a
good conductor such as a copper wire, and the magnetomotive force generated therefrom Thus,
the voice coil is caused to generate electromagnetic induction, and an electric signal is generated
in the voice coil without using a gold wire.
As a result, since no gold wire is used for the voice coil vibration, the symmetry on the weight
balance surface as a drive system is better than that of the conventional electrodynamic speaker,
and the gold wire is connected to the diaphragm. Therefore, it has many features such as the
reduction of the number of processes without the need for fixing process and the prevention of
the rolling of the diaphragm.
[0006]
The present invention relates to such an electromagnetic induction type speaker, and the above
conventional electromagnetic induction type speaker will be described below with reference to
the drawings.
[0007]
FIG. 2 is a half sectional view showing the configuration of a conventional electromagnetic
induction type speaker, and in FIG. 2, 1 is a lower plate having a center pole 8, 2 is a ring-shaped
magnet, 3 is a ring-shaped upper plate, The two components are combined to form a magnetic
circuit in which an annular magnetic gap 10 is formed.
Reference numeral 4 denotes a frame connected to the upper plate 3. A peripheral portion of the
diaphragm 5 in which a shorted voice coil 7 is connected to a central portion is fixed to a
peripheral portion of the frame 4. It is supported by the inner periphery of the damper 6 fixed to
the frame 4 and fitted into the magnetic gap 10, and the dust cap 22 is fixed so as to prevent
dust from entering the magnetic gap 10.
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[0008]
Reference numeral 9 denotes an electric input coil mounted on the lower portion of the side wall
of the center pole 8. When an alternating current flows through the electric input coil 9, an AC
magnetic field penetrating the center pole 8 is generated by the law of electromagnetic induction.
The alternating magnetic field penetrates the shorted voice coil 7 and a current flows in
accordance with the induced electromotive force generated in the voice coil 7.
As a result, a driving force according to the Lorentz force acts between the magnetic flux in the
magnetic gap 10 and the current of the voice coil 7, and the diaphragm 5 coupled with the voice
coil 7 is driven to emit a sound wave to perform electro-acoustic conversion. It was constructed
as follows.
[0009]
However, in the above-described conventional configuration, the magnetomotive force generated
when an electrical input is applied to the coil 9 for electrical input passes through the inside of
the center pole 8 and penetrates the voice coil 7 to the voice coil 7. Although an induced
electromotive force is generated, the internal magnetic resistance generated by the height
dimension H of the center pole 8 reduces the magnetomotive force generated by the coil for
electrical input 9, thereby causing the electromotive force flowing to the voice coil 7 to be also It
had the problem of reducing and causing a drop in efficiency.
[0010]
It is an object of the present invention to solve the above-mentioned problems and to provide an
electromagnetic induction speaker having high efficiency without the magnetomotive force
generated by the coil for electric input being reduced by the internal magnetic resistance of the
center pole. .
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, an electromagnetic
induction type loudspeaker according to the present invention comprises an outer peripheral
portion of the magnetic gap at an upper end of an inner peripheral portion of a magnetic gap of a
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magnetic circuit having a magnetic gap formed on the upper surface. A coil for electrical input,
which is formed by winding at least two or more coils formed so as to be opposed to each other,
is attached, a frame is coupled to the top of the magnetic circuit, and a peripheral portion of the
frame is attached While fixing the peripheral portion of the diaphragm in which the shortcircuited voice coil is coupled to the central portion, the voice coil is embedded in the magnetic
gap.
[0012]
With this configuration, the magnetomotive force generated by the coil for electric input
penetrates the voice coil without being affected by the internal magnetic resistance of the center
pole, and the attenuation of the induced electromotive force generated in the voice coil can be
prevented. Therefore, the efficiency can be improved as compared with the conventional
electromagnetic induction type speaker.
[0013]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a half sectional view showing the configuration of the electromagnetic induction type
speaker according to the present invention, in which 11 is a lower plate having a center pole 18,
12 is a ring magnet, and 13 is a ring upper plate These components are combined to form a
magnetic circuit in which an annular magnetic gap 20 is formed.
[0014]
The coil 19 for electric input is attached to the upper end of the center pole 18 of the lower plate
11, and the coil 19 for electric input forms a winding width in the same dimension as the
thickness dimension of the upper plate 13 which is the outer peripheral portion of the magnetic
gap 20. , And at least two or more coils are wound.
[0015]
A frame 14 is connected to the upper plate 13. A peripheral portion of a diaphragm 15 to which
a short-circuited voice coil 17 is connected at its central portion is fixed to the peripheral portion
of the frame 14. Is supported by the inner peripheral portion of the damper 16 whose peripheral
portion is fixed to the frame 14 and fitted into the magnetic gap 20, and the dust cap 21 is fixed
so as to prevent dust from entering the magnetic gap 20. There is.
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[0016]
In the electromagnetic induction type speaker of the present invention thus configured, when an
alternating current flows through the coil 19 for electric input, an alternating current magnetic
field penetrating the center pole 18 is generated by the law of electromagnetic induction.
The alternating magnetic field penetrates the short-circuited voice coil 17, and a current flows in
accordance with the induced electromotive force generated in the voice coil 17.
[0017]
At this time, in the present embodiment, since the coil 19 for electric input is formed to have the
same dimension as the width of the upper plate 13 and disposed so as to face the upper plate 13,
the coil flows into the electric input coil 19. It becomes possible for the AC magnetic field
generated by the AC current to penetrate the voice coil 17 with high efficiency without being
attenuated under the influence of the internal magnetic resistance of the center pole 18, and the
induced current generated in the voice coil 17 accordingly. It is possible to increase and improve
the efficiency.
[0018]
In the above embodiment, although the electromagnetic induction type speaker using the
external magnetic type magnetic circuit has been described, it is possible to use an internal
magnetic type magnetic circuit using a columnar magnet or a magnet and a pole piece in a yoke.
It goes without saying that the same can be said in the case of an electromagnetic induction type
speaker using an internal magnetic type magnetic circuit in which the input coil 19 is fixed to the
outer peripheral surface of the magnet, that is, the side wall.
[0019]
As described above, in the electromagnetic induction type speaker according to the present
invention, the reduction of the magnetomotive force due to the magnetoresistance is eliminated
by attaching the coil for electric input to the place where the magnetoresistance is the least, and
the most efficient drive is achieved. It is possible to easily obtain an electromagnetic induction
speaker provided with a system.
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