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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a tubular piezoelectric
transducer according to the present invention shown partially cut away, and FIG. 2 is used for the
tubular piezoelectric transducer similarly shown partially cut away FIG. 6 is a side view of the
piezoelectric cable to be DESCRIPTION OF SYMBOLS 1 ........ Tubular base material, 2 .........
Piezoelectric cable, 2a ........ Center electrode, 2b ........ Piezoelectric layer, 2c ........ Outer electrode ,
2d ..... Coat layer.
[Detailed description of the invention] A tubular piezoelectric transducer using a piezoelectric
ceramic such as lead zirconate titanate is known as a fluid microphone that measures the velocity
and pressure of fluid such as liquid; The above-mentioned piezoelectric ceramic is bent even if it
has a length of several +1 or more because it requires a sintering process at high temperatures of
1000 ° C. or more, and it is not practical because it is not distorted and it is rigid. Poor flexibility
[2] It is difficult to obtain the desired curvilinear shape, and there are many missing 1-2 '/'
"points which are easily broken. SUMMARY OF THE INVENTION The present invention solves the
above-mentioned drawbacks, and aims to provide a well-shaped tubular piezoelectric transducer,
which will be described below with reference to the drawings. In the figure, 1 is a highly flexible
tubular substrate 2 made of a polymer material such as rubber or plastics or a soft metal such as
aluminum, and covering a core wire 2a as a center electrode and the center electrode, Flexible
piezoelectric layer 2b in which powder of piezoelectric ceramic is dispersed in rubber or plastic,
conductive rubber or plastic laminated on the piezoelectric layer 1 or tape of soft metal such as
aluminum The outer periphery of the tubular substrate 1 is made of an outer electrode 2C of a
conductive material having flexibility and a flexible comb b or a plastic covering 1 → 2d covering
the outer electrode 2C. Fig. 6 shows a flexible piezoelectric cable spirally wound on a surface. It
is to be noted that the outer electrode 2C is intrinsically compared to metal (when the conductive
rubber or plastics having a high specific resistance is formed, the illustration is omitted, but the
piezoelectric layer 2b and the outer electrode 2 are used for the purpose of enhancing the
conductivity). Thin metal wires in a spiral form between the outer one pole 2C and the outer
layer 112d or between one or both of the outer layer 112d, or a metal mesh formed of metal thin
wires on the entire circumferential surface Although it may be wound, the bonder metal mesh is
also effective in the case where the outer electrode 2C is formed of a metal tape because it
exhibits a reinforcing effect. Thus, the flexible piezoelectric cable 2 annularly stacked around the
core wire 2a applies a high voltage of direct current between the core * 2a and the outer
electrode 2C to polarize the piezoelectric layer 2b, and then the end face of the outer electrode
2C. In addition to the center electrode, the lead wire is connected to a power transmission cable
(all not shown) via an impedance conversion element such as a FET) lanjestar together with the
center electrode. In addition, 2e and 2e 'are insulating layers that protect the exposed end face of
the piezoelectric layer 2b from moisture. Next, 3 is a holding material made of the same flexible
rubber or plastic which covers the outer periphery of the flexible tubular substrate 1 in which the
flexible piezoelectric cable 2 is spirally scraped. It is unnecessary and can be omitted.
3- As described above, the tubular piezoelectric transducer according to the present invention
has the core wire serving as the center electrode and the powder of piezoelectric ceramic
dispersed in rubber or plastics on the outer peripheral surface of the flexible tubular substrate I.
A flexible piezoelectric layer 2b, a conductive flexible material covering the pressure w layer, an
outer electrode 2C, and a flexible rubber or plastic material covering the outer electrode 2C.
Since the piezoelectric cable having one layer 27d is spirally formed in a spiral shape, it bends
and unavoidably causes distortion-eliminating the "baking process" and making a true circle and
an accurate linear body originally any curve Because it can be molded into a length exceeding
several tens of boxes by extrusion or dipping or a combination of sodas, it is used for a tube-like
"□" piezoelectric transducer such as a pond-in-water microphone of the aforementioned fluid
microphone Play an effective role It is intended.
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