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JPS62281699

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DESCRIPTION JPS62281699
[0001]
The present invention relates to an electromagnetic induction type sound source device, and in
particular, an electromagnetic induction type which emits an extremely short and powerful
pulsed sound wave into a medium such as water. The present invention relates to a sound source
device. [Prior Art] As a converter 6 of a conventional electromagnetic induction type sound
source device shown in FIG. 3, a thin insulating film 2 is formed on the surface of a coiled coil 1
formed on an insulator 4 as a fixed portion. A thin conductive plate 3 made of copper, aluminum
or the like is closely attached (the insulating film 2 and the conductive plate 3 are drawn apart
for easy understanding in the drawing). The opposite side of the conductor plate is in contact
with the medium 5 such as water. Supply of current to the thin wound coil is performed as
follows. With the switch 13 open, the charge stored in the capacitor 12 is discharged from the
high voltage power supply 10 through the resistor 11 by closing the switch 13. When a current
is supplied to the coil, a secondary eddy current is generated in the conductor plate by the
magnetic field generated in the coil. The secondary magnetic field generated by this secondary
eddy current produces repulsion with the magnetic field generated in the spiral coil. In this way,
the vibration generated in the conductor plate by the anti-tΩ force generated between the thin
coil and the conductor plate radiates a sound wave by propagating into the medium such as
water. [Problems to be Solved by the Invention] The conventional electromagnetic induction type
sound source device reduces the mass of the conductive plate when trying to shorten the
duration of the sound wave to be emitted. That is, it was necessary to make the conductor plate
as thin as possible. However, thinning the conductor plate increases the resistance to the
secondary eddy current and reduces the secondary magnetic field, resulting in a drawback that
the repulsive force, that is, the pressure of the emitted sound wave decreases. In order to focus
the sound wave to be emitted or to increase the pressure of the sound wave, it is conceivable to
divide the coil of a thin coil into a plurality of parts and to flow a current to terminals individually
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extracted from each of the divided parts. Also in this case, when it is going to take out a terminal
from the surface of a thin coil in the prior art structure, it was very inconvenient because the
close contact with a thin coil and a conductor board was interrupted. SUMMARY OF THE
INVENTION An object of the present invention is to provide an electromagnetic induction
vibration a device that emits a strong sound wave with a short duration. Another object of the
present invention is to provide an electromagnetic induction type sound source device in which it
is easy to divide a thin coil into a plurality of parts and take out the terminals individually from
each of the divided parts. [Means for Solving the Problems] The present invention is
characterized in that the conductor plate is fixed, and a thin coiled coil closely attached to the
conductor plate is used as a diaphragm.
[Function] By using a spiral wound coil as a diaphragm, it is possible to reduce the mass of the
diaphragm and to radiate a short sound wave, and at the same time to make the conductor plate
thicker, thereby reducing the secondary eddy current resistance. . It is possible to increase the
pressure of the radiated sound wave. FIG. 1 shows an embodiment of an electromagnetic
induction type sound source apparatus according to the present invention. The coiled coil 1 is
formed on the insulating film 2, and the conductor plate 3 generating the secondary current is in
close contact with the insulating film 2 to form the converter 6. The helical coil can be formed by,
for example, the following method. A copper plate is adhered to an insulating film of about 25
μm polyimide film, and is etched in a thin coil. Furthermore, it is desirable to form an insulating
layer 9 (not shown) on the spirally wound coil by applying an insulating paint or the like to
prevent discharge with the medium 5 such as water. The diaphragm made in this way. Since Xi is
small, it is possible to operate up to Gε several MHz. Copper or aluminum is used as the
conductor plate 3. Conductor plate does not vibrate unlike the conventional method. Thickness
can be chosen arbitrarily. By setting the thickness to about 10 mm, the resistance to the
secondary eddy current can be sufficiently reduced, and the pressure of the radiated sound wave
can be prevented from being reduced. The bonding between the conductor plate 3 and the
insulating film 2 (polyimide film) may be performed by bonding the entire surface with a resilient
adhesive such as a rubber adhesive, or by bonding only the peripheral edge portion to the
insulating film The central part of the may be floated in the air. The supply of current to the coil
1 of the transducer is carried out in the manner described in the prior art of FIG. In the
embodiment of FIG. 1, the opening and closing of the switch 13 is controlled by the signal of the
trigger generation circuit 14. Therefore, charging and discharging the capacitor 12 can be
repeated by opening and closing the switch 13 in a predetermined cycle. Although it is possible
to use a transistor for normal switching as the switch 13, it is convenient to use a thyristor as
shown in FIG. 1 because the switching time can be shortened. FIGS. 2 (a) and 2 (b) show a front
view and a sectional view of a converter according to a modification of the present invention.
Since the spiral coil 1 is not in close contact with the conductor Fi3 as in the conventional
example of FIG. 3, it is easy to divide it into one and take out the terminal. It is obvious that the
present invention can be applied to two or more division numbers, but in FIG. 2, the explanation
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will be made with two division number being two for simplification, and the terminals from the
outside thin coiled coil to Tl and T4 are inside. From the helical coil, T2.
Take out the terminal of T3. ここでT1とT3. If current is supplied to the two terminals
obtained by connecting T2 and T4 according to the circuit shown in FIG. 1, the outer thin coil
and the inner thin coil are connected in parallel, so more current can be obtained. It can flow and
the sound pressure of the radiated sound wave can be increased. Also, terminals of Tl and T4 and
T2. It is also possible to focus the radiation sound waves by connecting the terminals of T3 to
individual circuits and providing a time lag to the discharge lighting. As mentioned above,
although circular was shown as a shape of a spiral coil, it is clear that it is applicable to this
invention even if it is another shape 2 for example, a rectangle. [Effects of the Invention] As
described above, according to the present invention 2, it is possible to emit a strong sound wave
with a short duration, and to have an effect such as easy to focus the radiation sound wave. In
practice, it is extremely useful.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing the configuration of an embodiment of an electromagnetic induction
warning g apparatus according to the present invention, FIG. 2 is a view showing a modification
of a converter of an electromagnetic induction type sound source apparatus according to the
present invention, and FIG. It is a figure showing an electromagnetic induction type sound source
device.
1 is a spiral coil. 2 is a vermilion rim. 3 is a conductor plate. 4 is an insulator. 5 is the medium. 6
is a converter. 10 is a high voltage power supply. 11 is an abrasive. 12はコンデンサー。 13は
スイッチ。 14 is a trigger generation circuit. Oh (4 colors Ell-field tρ ita, i saka shi) bee 4 Figure
T4Ts Tz Tl Ne, woman's treatment of Shiro? Vessel, transformation of flight]
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