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JPH0370400

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DESCRIPTION JPH0370400
[0001]
FIELD OF THE INVENTION The present invention relates to a sound generator. [Description of
the Related Art] In water, low frequency is used for various marine technologies such as sonar,
marine resource exploration, fish school guidance, etc., because the transmission efficiency is
high compared to high frequency. The conventional underwater sounding body utilizes the
piezoelectric phenomenon as one of its principles. In JP-A-61-181299, an example of a
piezoelectric wave transmitter is shown. In this prior art, a lever is used to expand the
displacement of the piezoelectric body in order to avoid the limitation of the displacement of the
diaphragm which is a drawback of the piezoelectric transmitter. [Problems to be Solved by the
Invention] However, since the conventional device uses a shell structure for the sounding body,
the present invention solves the above problems by requiring a large force to displace the shell. It
is an object of the present invention to propose a sounding body capable of efficiently and
largely displacing the vibrating body. [Means for Solving the Problems] In the sound-producing
body according to the present invention, a magnetostrictive material for striking a diaphragm
provided in a case and one end thereof are connected by the magnetostrictive material and a
connecting rod, and the other end is fixed to the case It is a sound generator comprising a
magnetostrictive material and a coil for driving the same, and the above power generator using a
piezoelectric material instead of the magnetostrictive material. In the sound-generating body in
the present invention, the magnetostrictive material for striking the diaphragm provided in the
case, the magnetostrictive material having one end connected with the magnetostrictive material
and the connecting rod, and the other end fixed to the case, When the alternating current having
the same phase is supplied to the coil, the diaphragm is vibrated and generated by the additive
action of the blue magnetostrictive material. In addition, even if the magnetostrictive material is
replaced with a piezoelectric material, the same effect is obtained. FIG. 1 is an explanatory view
showing an embodiment of the present invention. The diaphragm 2 is attached to the left end of
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the case 1 and one end of the magnetostrictive material 3 is disposed at a position close to the
diaphragm, or the diaphragm and the magnetostrictive material are in contact. Is fixed, and the
other end of the connecting rod is fixed to one end of the magnetostrictive material 5. The other
end of the magnetostrictive material is fixed to the case. The case is of sufficient mass. Further,
the coil 6 is disposed in the vicinity of the magnetostrictive material 3 and the coil 7 is disposed
in the vicinity of the magnetostrictive material 5. When alternating current is applied to the coil
6 and the coil 7 by the power supply and the phase tuning device (not shown), the
magnetostrictive material 3 and the magnetostrictive material 5 synchronously vibrate and the
blue magnetostrictive material is connected by the connecting rod 4. The displacement is
doubled as compared with the single magnetostrictive material. By this, the diaphragm is struck
to vibrate the diaphragm.
It is pronounced by this. Although magnetostrictive materials are juxtaposed and connected in
this embodiment, they may be arranged in series, or both coils may be connected to omit the
phase tuning device. According to the above, it is also within the scope of the present invention
to connect a plurality of three or more magnetostrictive materials. [Effects of the Invention] As
described above, according to the present invention, since the diaphragm is hit by the additive
action of the magnetostrictive material, the amplitude of the vibration can be increased, and a
large sound pressure can be obtained with a compact facility. It becomes possible.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view showing an embodiment of the present invention.
1: Case 2: Diaphragm 3: Magnetostrictive material 4: Connecting rod 5. Magnetostrictive material
6: Coil 7. Coil 7..
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