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JPH02186800

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DESCRIPTION JPH02186800
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
elliptical-tube bending transducer for transmitting and receiving sound waves in water as an
electroacoustic transducer. Conventionally, as shown in FIG. 3, a piezoelectric element group 1
bonded to each other in an internal air chamber of an elliptic cylinder 2 is arranged in the major
axis direction of the ellipse as shown in FIG. Filled and bonded in a row 1 layer, flanges 3 and 4
are attached to both ends of the elliptical cylinder 2. Further, the lead wires 6, 6 'of (+) (-) of the
piezoelectric element group 1 are structured to be drawn out from the cable 5 into water. In the
conventional technology, the cross-sectional area of the piezoelectric element with respect to the
elliptic cylinder is small, and the efficiency of the transducer is low because the impedance can
not be high and the elliptic cylinder can not be driven efficiently. there were. Also, even with the
piezoelectric element group of one prior art, if the cross-sectional area of the piezoelectric
element is increased, the impedance is lowered and the efficiency is increased, but in the
manufacture of the piezoelectric element, the shape is considerably larger than that of general
circulating products. Polarization, handling, etc. become difficult, which causes an economic
problem. The object of the present invention is to provide an elliptical bending transducer which
overcomes the disadvantages of the prior art described above. [Means for Solving Crystals] The
feature of the present invention is that it is characterized in that it is low in impedance and has
high efficiency by putting in layers of piezoelectric elements that are vibration sources that are
inserted in the long axis direction of the elliptic cylinder. is there. Further, each piezoelectric
element constituting the multi-layer piezoelectric element group is advantageous in that it is
extremely difficult to manufacture, is extremely easy to obtain, is light in assembly, is easy to
handle, and is easy to handle. [Operation] The elliptical tube bending type transducer according
to the present invention has conventionally driven the elliptical tube by only one layer of
piezoelectric element groups, but each piezoelectric element required to open the elliptical tube
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by forming plural layers of piezoelectric element groups The load on the device is reduced, and
high efficiency is achieved by low power drive. An embodiment of the present invention will be
described with reference to FIGS. 1 and 2. FIG. Multiple piezoelectric elements 1.1 'and 1' of
zirconate and lead titanate-based porcelains bonded in multiple layers are arranged in multiple
layers and placed in the center of the inner surface in the long axis direction of the metal
elliptical cylinder 2, bonding Do. Further, metal flanges 3 and 4 for waterproofing are attached
and fixed to both ends of the elliptic cylinder 2 which are open ends. Also, a cable 5 for power
transmission and signal transmission is attached from one of the flanges 3. The cable 5 end and
the (+) (-) electrode lead wires 6, 6 'of the piezoelectric element group 1.1' 1 'are connected in
advance. In the present embodiment, electric power is applied from the cable 5 to the electrode
part of D and (-) of the piezoelectric element group 1 through the lead wire 6.6 ', and in the
direction of the arrow shown in FIG. The vibration is transmitted to the elliptic cylinder 2, the
outer surface of the elliptic cylinder 2 expands and contracts, and the sound wave 8 is emitted
into the water.
Also, the sound wave 8 from the water is transmitted as vibration to the elliptic cylinder 2
piezoelectric element groups 1.1 ′ and 1 ′ in the reverse path, converted into electromotive
force by the piezoelectric element and output to the cable 5 from the lead wire 6 ° 6 ′. Ru.
[Effects of the Invention] According to the present invention, the use of multi-layer piezoelectric
element groups 1, 1'1 'results in lower impedance and less excitation voltage and current than
those driven by only one layer of conventional piezoelectric elements 1 alone. Also, the need for
transformers and the like is eliminated, and the efficiency of the elliptic cylinder can be increased
by largely taking it.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal half sectional view showing an embodiment of an elliptical cylinder
bending transducer according to the present invention, FIG. 2 is a sectional view taken along the
line II--II of FIG. 1, and FIG. FIG. 1 is a longitudinal half sectional view of an embodiment of a
flexing transducer.
1 to 1 '... Piezoelectric element group 2 ... Elliptical cylinder 3 ... Flange (1) 4 ... Flange (2) 5 ...
Cable 6, 6' ... Lead wire 7 ... Shake @ 8 ... Sound wave l; Figure bird B Figure
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