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JPS57145497

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DESCRIPTION JPS57145497
Specification 11 Title of Invention 2,% #! The acoustic impedance density of a medium in which a
sheet of a polymeric piezoelectric material having electrodes on both sides and an odd number of
diffraction folded in a corrugated form is cylindrically wound and formed, and both end faces or
the entire outer surface are used. A transducer characterized in that it is covered in a watertight
manner with an insulating material having an acoustic impedance density close to that of the
transducer.
Transducer
3. Detailed Description of the Invention The present invention is directed to a sheet of flexible
piezoelectric material or a composite piezoelectric material comprising fine powder of a high
molecular weight material and a piezoelectric ceramic material (hereinafter both sheets are
simply referred to as a piezoelectric sheet). The present invention relates to a transducer using
Conventionally, a piezoelectric ceramic or magnetostrictive vibrator is used for this type of
transducer, but these vibrators differ in acoustic impedance density from the acoustic impedance
of water etc. It is easy to reflect the received sound from the thing, and the weight is also heavy.
In addition, there is an inevitable defect in the physical properties of the material, such as the
need for special equipment for forming during production. For example, the ratio of the acoustic
impedance density of the piezoelectric ceramic type vibrator to that of water is 15 or more.
When the above-mentioned pendulum is used as a pressure receiver, the reflectance of the
previous strength is as high as 80 О. An object of the present invention is to use a piezoelectric
sheet for a transducer of a transducer, to eliminate reflection of sound due to acoustic impedance
density mismatch generated between a medium such as water, and to use the piezoelectric sheet.
By folding in an odd number of times, it is possible to prevent a short circuit between electrodes
without having an insulating layer, and it is possible to simplify manufacture, assembly and
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transportation, and to reduce weight as compared with the conventional one. To provide a
portable transducer. In order to achieve the above object, the transducer according to the present
invention has electrodes on both sides, and is formed into a cylindrical shape by winding a
bellows-like odd-numbered diffraction-folded piezoelectric sheet into a cylindrical shape and an
end face of EndPage: 1 Alternatively, the entire outer surface is covered in a watertight manner
with an insulating material having an acoustic impedance density close to the acoustic
impedance density of the medium to be used. Next, embodiments of the present invention will be
described with reference to the drawings. The piezoelectric sheet can convert not only sound to
electricity but also electricity to sound, so-called reversibility, which will be described in the case
of sound to electricity conversion. FIG. 1 is a view for explaining the molding state of the first
embodiment of the present invention, and (6) shows the piezoelectric sheet 1 before molding, in
which the electrodes 3 and 4 and the electric terminals 3 'and 4' are used. Have. (C) shows a state
of being folded in a bellows-like manner three times as an example of an odd number of times. 0
is an oblique view of the case where it is formed into a tubular shape after being folded in a
bellows shape. As is apparent from the figure, if the number of times of folding is an odd number,
it is possible to prevent short circuiting of the electrodes on both sides of the piezoelectric sheet
1 when formed into a cylindrical shape. FIG. 2 shows the results of FIG. In the figure for
demonstrating the shaping | molding state of a 3rd Example, (a) is the figure which processed
one side of the piezoelectric sheet 1 so that the end surface after shaping | molding becomes
concave, (b) folded (5). FIG.
By winding this in a cylindrical shape, a concave transducer such as 0 can be made. Similarly, it
can be processed as shown in 0, folded as shown by {circle over (2)} and cylindrically wound to
make a convex transducer as shown in (6). Further, by applying the processing shown in FIG. 2,
(a), 0 to the opposite side, it is possible to make a transducer having both concave and convex
end faces. FIG. 3 shows a cylindrical shape shown in FIG. 1 and covered with an insulating
material 2 having an acoustic impedance density close to the acoustic impedance density of a
medium using a piezoelectric sheet, and watertightly covered so as not to leave air bubbles or air
layers. FIG. 2 is a structural diagram showing an appearance and is a diagram of FIG. The same
watertight structure is adopted for the third embodiment. Next, the principle of operation will be
described using the first embodiment. The acoustic impedance density [1, 6 О 105 to 2, 3 О
101 S (gr / cm 1 g)] of the piezoelectric sheet is very similar to that of water (1, 5 О 10 1 S (gr /
cm's)). Therefore, the incoming sound is incident on the piezoelectric sheet with almost no
reflection. Now, it is assumed that the sound pressure distribution at a certain point in time of the
sound incident from the axial direction of the cylindrical piezoelectric sheet of FIG. 4 (c) is in the
state of (5). Where X is the axial position and P is the sound pressure. Assuming now that the
length of the cylindrical piezoelectric sheet is l, the pressure in the piezoelectric sheet is P1. This
is the length of the piezoelectric sheet by the sound pressure! Means that the output voltage
proportional to P1 is generated between the electrical terminals 3 ', 4'. Although the thing of the
structure which the whole outer surface contact | connects in water was demonstrated above, it
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may be a structure which interrupt | blocks the whole surface or one part other than an end
surface acoustically. The number of cylindrical piezoelectric sheets does not have to be one, and
the end faces may be aligned and arranged in parallel may be electrically connected in series or
in parallel, and the diameters of the cylindrical piezoelectric sheets are also the same. There is no
need, and a plurality of cylindrical piezoelectric sheets with different diameters in which the
number of turns of the piezoelectric sheet is increased or decreased may be used. As described
above, according to the present invention, it is desirable that the piezoelectric sheet be bellowsshaped and be odd-numbered diffraction-sealed, cut it into a desired length and shape, and
formed into a cylindrical shape It can be easily manufactured by cutting and processing into
length and shape, and covering it with an insulating material having an acoustic impedance
density close to the acoustic impedance density of the medium using at least both end faces of
the entire outer surface in a watertight manner. According to the structure, it is possible to obtain
a low-loss underwater transducer that can withstand external water pressure, is lighter in weight
than conventional vibrators, and has less sound reflection.
4, a brief description of the drawing
Transducer
FIG. 1 is a view for explaining a molding state of the first embodiment of the present invention,
(8) is a view showing a state of a piezoelectric sheet, and (iii) is a view when it is formed in a
bellows shape. Fig. 0 is an oblique view after forming, Fig. 2 is a view for explaining a forming
state of another embodiment of the present invention, and 0 and 0 are oblique views of a
piezoelectric sheet, (iii) and (iii) ) Is a folded view, 0 and (g) are side views of when they are
formed into a cylindrical concave and convex shape, and FIG. 3 shows the shape of the first
embodiment of the present invention after molding. 4 is a detailed explanatory view of the
present invention, in which (5) is at a time when there is a sound vertically incident from the
axial direction, in which the outer surface of the cylindrical piezoelectric sheet is covered with
the insulating material EndPage: 2; (B) is a cross-sectional view cut along a plane passing through
the center in the axial direction. 1 иии Piezoelectric sheet, 2 и и и и и и и и и и и и и и и 3 и и и и и electrode 3 ',
41 и и и и и и и и electrical terminals. Attorney Attorneys Uchihara ? ~ I End EndPage: 3 3rd EndPage:
?
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