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DESCRIPTION JPS5726995

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DESCRIPTION JPS5726995
Method of manufacturing ultrasonic transducer The present invention relates to a method of
manufacturing an ultrasonic transducer comprising a plurality of piezoelectric ceramic
transducers arranged in a cylindrical shape, which is a cylindrical piezoelectric ceramic vibrator.
Are sintered, and electrodes are formed on the inner and outer peripheral surfaces of the
cylindrical piezoelectric ceramic vibrator and subjected to polarization treatment, and then a
plurality of wedge-shaped piezoelectric ceramic vibrators are formed from the cylindrical
piezoelectric ceramic vibrator. A method of manufacturing an ultrasonic transducer, wherein the
acoustic radiation surface of the piezoelectric ceramic vibrator cut out and cut out in a wedge
shape is arranged as a circular arc equal to the outer cylinder of the arrayed cylindrical surface.
Claims
Detailed Description of the Invention The present invention relates to a transducer for an
underwater ultrasonic detection device mounted on an underwater target, which is an ultrasonic
wave, and more specifically, an arrangement configuration so that the acoustic emission surface
of the piezoelectric ceramic vibrator is cylindrical. The present invention relates to a method of
manufacturing a vibrator suitable for G. A conventional piezoelectric ceramic vibrator of this type
is formed by forming a ceramic material into a rod or wedge shape, sintering it, forming positive
and negative electrodes on both surfaces, and performing polarization processing as shown in
FIG. As shown in (a) and (b), they were arranged in a cylindrical shape and used. In FIGS. 1 (a)
and 1 (b), 1.2 is a rod-like and wedge-shaped piezoelectric ceramic, 11.21 and ?, 22 are
electrodes sintered to the respective piezoelectric ceramic 1 and 2 (-, +) 1-shown, these individual
piezoelectric ceramic vibrators are arranged and arranged such that the acoustic radiation
surface is cylindrical. In FIG. 1 (a), the space factor of the radiation surface is reduced due to its
geometric size, which is not preferable in terms of acoustic density or sound receiving area. In
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addition, these points can be improved by using individual vibrators formed into a wedge shape
as shown in FIG. However, strictly speaking, FIG. 1 (a), (b) 'fr: the radiation direction of each
piezoelectric ceramic vibrator is a plane, and when a plurality of these are arrayed in a cylindrical
plane, the phase in the sound field is In terms of aspect, it has a phase difference in principle, and
it is not preferable in the case of expecting the performance of high resolution EndPage: 13
pages performance no matter how high precision alignment is attempted. SUMMARY OF THE
INVENTION In view of the above-mentioned drawbacks, the present invention is to provide a
high-resolution underwater ultrasonic transducer having no phase difference in the sound field.
The present invention achieves the above object by forming the acoustic emission surface of each
transducer constituting the underwater ultrasonic wave transmission wave in an arc equivalent
to the outer cylinder of the arrayed cylindrical surface. Hereinafter, an embodiment of the
present invention will be described in detail with reference to FIGS. (A) to (c). 2 (a) to 2 (e) are
diagrams for explaining the processing method of the transducer constituting the underwater
ultrasonic transducer and the shape and arrangement of the transducer, and FIG. 2 (a) As shown
in the figure, the electrode (-) 31 is on the outer peripheral surface of the cylindrical piezoelectric
ceramic vibrator 3 made of a piezoelectric ceramic material such as barium titanate ceramic or
lead zirconate titanate magnet, and the inner peripheral surface is An electrode)) 32 is formed,
and in this state, a polarization treatment is performed by an apparatus not shown. The
cylindrical piezoelectric ceramic vibrator 3 has the same radius of curvature as the outer arc of
the arrangement surface in the case of the cylindrical surface arrangement described above after
the radius bt of the outer periphery, and the arrangement surface in the case of cylindrical
arrangement as the radius a of the inner periphery. The curvature is equivalent to that of the
inner arc of the circle.
And, the dimension of the diameter a-b is a dimension having a fundamental wave resonance in a
predetermined length direction. As shown in FIG. 2), the width of the polarization-treated one "is
determined so as to be a predetermined angle ?, and sequentially cut out to obtain individual
piezoelectric ceramic vibrators 30. Then, the negative lead wire 312 is soldered to the electrode
31 at the solder point 313, and similarly, the glass lead wire 322 is soldered to the electrode
portion at the solder point 323. As shown in FIG. 2 (b), those cut out and processed are arranged
so as to have a cylindrical surface having a pre-designed curve as shown in FIG. 2 (c). Here, the
same cylindrical surface as in Fig. 2 (a) is a stone '. Then, the arc-shaped transducer is fixed to a
frame and a case (not shown) by adhesion or the like, and lead wires are wired to constitute one
ultrasonic transducer. Thus, since the radiation plane of each transducer does not have an arc t,
high resolution performance without phase difference can be expected. As is apparent from the
above-described embodiment, the ultrasonic transducer according to the present invention,
which has a 5-page ultrasonic transducer according to the present invention, is formed by
burning the transducers constituting one ultrasonic transducer as arcs equal to the outer
circumference of the arrayed cylindrical surface. After forming the electrodes, after forming the
electrodes, it is polarized and it is cut out from the cylindrical transducer in a wedge shape, and it
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is arranged and assembled in the original cylindrical shape, so ultrasonic transmission /
reception The radiation planes of the individual vibrators constituting the chamber form arcs,
and high resolution performance with extremely small phase difference can be expected. In
particular, since the phase difference that the acoustic radiation surface basically gives to the
sound field is very small, it is possible to obtain an ultrasonic transducer in which the
transducers are arranged in a cylindrical shape by a nearly complete piston movement.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) are partial plan views showing the
arrangement of an ultrasonic transducer constructed based on the conventional manufacturing
method, and FIG. It is a figure for demonstrating an Example, Comprising:-) is a whole top view of
the sinter-processed vibrator, ?) forms an electrode in the inside and outside aspect, and is a top
view of the vibrator cut out in the shape of a wedge. (C) is a top view at the time of arranging the
transducer cut out in wedge shape cylindrically, and comprising one ultrasonic transducer. 3 иии
Cylindrical piezoelectric ceramic, (Material) иии Wedge shaped piezoelectric ceramic, 31.32 и и и
Electrodes, 312, 322 иии Lead wires, 313 и 323 и и и Soldering points. Agent patent attorney Masami
Akimoto EndPage: 2 Fig. 1 (a) I 7 DI (b) ? 211 (a) Fig. 2 (b)-13 Fig. 2 (C) End Page: ?
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