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JPS60196100

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DESCRIPTION JPS60196100
[0001]
TECHNICAL FIELD The present invention relates to a 7L air mechanical transducer used for an
electroacoustic transducer that converts electrical vibration into mechanical vibration to generate
vibration in water, and in particular, a low frequency resonance type transmission wave. Low
frequency electromechanical transducer used as a transformer. 2. Related Art Conventionally, as
a low frequency electromechanical transducer, a vJ type that can obtain low frequency resonance
by a flexible mechanical vibration system or an electrostrictive type using a bending plate is
used. The conventional transducers described above have the disadvantage that the water
resistance is poor because the mechanical vibration system is flexible. Also cylindrical! ! The low
frequency electromechanical transducer used for vibration vibration is relatively excellent in
water pressure resistance, but because the longitudinal elastic constant in the circumferential
direction is high, the outside diameter size increases in inverse proportion to the frequency, It
has the disadvantage of being bulky and heavy at low resonance frequencies. OBJECTS OF THE
INVENTION The object of the present invention is to solve the drawbacks of the prior art
mentioned above and to provide a compact, lightweight, hydraulic resistant low frequency
electromechanical transducer. In the low frequency electromechanical transducer of the present
invention, a single coiled vibrator is formed of an electrostrictive material that generates a strain
according to an applied voltage, and both ends of the coiled vibrator are metal fittings. It is
characterized in that it is fixed by The invention will now be described in detail with reference to
the drawings. FIG. 1 (A) is a front view showing a first embodiment of the present invention, FIG.
1 (B) is a plan view thereof, and FIG. 1 (C) is an AA cross-sectional view thereof. That is, the
electrostrictive material is formed in a coil shape to form the coiled vibrator 1, and the upper and
lower ends of the coiled vibrator 1 in the figure are fixed by the metal fitting 2. The metal fitting
2 is a substantially circular upper and lower fixing portion 2a having a step as shown in FIG. The
two cylindrical members 2b are fixed by a substantially cylindrical connecting part 2c, and the
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tip of the coiled vibrator 1 is fixed to the stepped parts of the fixed parts 2a and 2b by brazing or
the like. Electrodes are attached to the inner and outer surfaces of the coiled vibrator 1, and lead
wires 3a and 3b are connected to the electrodes. The coiled vibrator 1 uses a so-called lateral
electrostrictive effect in which the direction of the electric field of the electrostrictive material is
perpendicular to the direction of vibration. Therefore, when an electrical signal is applied from
the lead wires 3a and 3b, the coiled vibrator 1 generates strain in its length direction and causes
mechanical vibration along the circumferential direction. And it resonates mechanically at the
frequency which a standing wave of a half wavelength produces in the coil full length of the
coiled oscillator 1. Both ends of the coiled vibrator 1 are fixed by the metal fitting 2, and the
vibration is damped.
Thus, the circumferential vibration of the coiled vibrator 1 is converted into radial vibration.
Therefore, it is possible to radiate a sound wave of the resonance frequency in the radial
direction. The outer surface is covered with a rubber mold or the like to be used as a transducer,
and when used in water, it is excellent in water pressure resistance. FIG. 3 is a perspective view
showing a second embodiment of the present invention. In this case, in order to use the
electrostriction effect in the longitudinal direction, the coiled vibrator 4 in which the
electrostrictive material is formed into a coil is provided with the winding electrodes 5 at equal
intervals, and the electrodes 5 are alternately connected. Connect to lead wires 3c and 3d. The
electrostrictive effect in the longitudinal direction is higher in electro-mechanical conversion
ratio than the electrostrictive effect in the lateral direction, so that an efficient low frequency
electromechanical transducer can be obtained. The water pressure resistance is as good as in the
above examples. FIG. 4 is a perspective view showing a third embodiment of the present
invention. In this case, a plurality of sets of electrostrictive materials 7a, lead-out electrodes 8
and electrostrictive materials 7b are implanted at equal intervals in the coiled vibrator 6 made of
an elastic material. The plurality of lead-out electrodes 8 are connected to the lead wire 3e, and
an electrical signal is applied between the lead wire 3e and the lead wire 3f provided at the end
of the coiled vibrator 6. In this case, the speed of sound inside the coiled vibrator 6 can be
changed by selecting the elastic material of the coiled vibrator 6, so that there is an advantage
that the resonance frequency can be adjusted. It is possible to make up for the material.
Moreover, it has the advantage of being easy to process. In each of the embodiments described
above, the number of turns of the coiled vibrator can be set arbitrarily, and the resonance
frequency can be lowered as the number of turns is increased. Since the resonance condition of
the coiled oscillator is that the total length is equal to a half wavelength of vibration, a cylindrical
vibrator with the same outer diameter (the resonance condition is that the circumference is equal
to one wavelength of the vibration ), The resonant frequency can be lowered in inverse
proportion to twice the number of turns. Therefore, the low frequency electromechanical
transducer can be provided in a small size. In each of the above embodiments, although both
ends of the coiled vibrator and the metal fitting 2 are bonded or mechanically connected and
fixed by brazing, since the metal fitting 2 is not a rigid body, the vibration of the coiled vibrator is
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, The braking ability of the bracket 2 is somewhat affected. If the electrostrictive material is
embedded in the metal fitting 2 and the metal fitting 2 itself is torsionally vibrated in the
direction in which both ends of the coiled vibrator are damped, the influence can be eliminated.
As described above, according to the present invention, since both ends of the coiled vibrating
body are fixed by the metal fittings in the present invention, the low frequency vibration
corresponding to the length of the coiled vibrating body is vibrated in the radial direction. Can be
converted to
Therefore, there is an effect that a low frequency electromechanical transducer having high
water pressure resistance can be provided in a small size and light weight.
[0002]
Brief description of the drawings
[0003]
FIG. 1 (A) is a front view showing the first embodiment of the present invention, FIG. 1 (B) is a
plan view, FIG. 1 (C) is a sectional view taken along the line A-A, and FIG. FIG. 3 is a perspective
view showing a second embodiment of the present invention, and FIG. 4 is a perspective view
showing a third embodiment of the present invention.
In the figure, l: coiled vibrator, 2: metal fitting, 3a to 3f: leat wire, 4: coiled vibrator, 5: electrode,
6: coiled vibrator of elastic material, 7a, 7b: electrostrictive material, 8: Extraction electrode.
Applicant: NEC Corporation Attorney Attorney Sumita Sumita 1 Figure 22 Figure 3 gl 4
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