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JPS5782796

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DESCRIPTION JPS5782796
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present
invention, wherein A is a perspective view of a piezoelectric sheet, and B is a perspective view of
two piezoelectric sheets laminated with the polarization directions reversed. , C is a side view
when the number of laminated sheets is increased, FIG. 2 is a structural view in which the outer
surface of the first embodiment of the present invention is covered with an insulating material,
and FIGS. 3A and 3B explain the working principle of the present invention. It is a figure for. 1
ииииии Piezoelectric sheet, 2, 3 ииииии Electrode, 2?-1 ░ 2 ?-2 ? 3 иииииииии Electrical terminal, 4 иии
Exterior Insulator.
[Detailed description of the invention] Name of the Invention 1 The transducer 2, the utility
model registration request Ii! 2) At least one sheet of a polymeric pressure% material having a%
M on the both sides or a mixture of a polymeric material and a fine powder of a pressure%
porcelain material is laminated with at least one sheet of the material having the same
polarization direction 2 The sheet group of the set is laminated with the direction of polarization
reversed, and a cathode is taken out from both end faces of the sheet group after lamination and
between predetermined sheets, and two opposing ridges or the entire outer surface are used A
transducer characterized in that it is watertightly packed with a binding material having an
acoustic impedance density close to the acoustic impedance density of the medium. 3. The
invention of the invention The present invention is a composite piezoelectric material 1--) zr, /
b7: composite material comprising a flexible polymeric piezoelectric material or a fine powder of
a polymeric material and a piezoelectric ceramic material The present invention relates to a
transducer using a sheet (hereinafter referred to as a sheet as a piezoelectric sheet).
Conventionally, in a transmitter-receiver manufactured by laminating a plurality of piezoelectric
sheets of this type, in order to improve the wave receiving sensitivity, a method in which
electrodes are connected in series is used5. Sometimes there is a drawback that good
transmission and reception sensitivity can not be obtained because the Kainbi-dance is
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sometimes high. An object of the present invention is to provide a transducer having good wave
receiving sensitivity and wave transmitting sensitivity by improving the connection method of
electrodes. In order to achieve the above object, the transducer according to the present
invention is formed by making two sets of the same number of laminated sheets in different
polarization directions of the piezoelectric sheet having electrodes on both sides and laminating
the polarization directions in reverse. Taking out the electrodes from both end faces and a
predetermined distance between sheets, and sealing them in a watertight manner with an
insulating material having an acoustic impedance density close to the acoustic impedance density
of the medium used or the two opposite faces or all sides It is Embodiments of the present
invention will now be described with reference to the drawings iii 202-. The piezoelectric sheet is
capable of converting not only sound to electricity but also electricity to sound, and has so-called
reversibility. The case of sound to electricity conversion will be described below. FIG. 1 is a view
for explaining the first embodiment of the present invention, and FIG. 1 (4) is a view before
stacking the piezoelectric sheet 1, and one pole 2.3 and electrical terminals 2 'and 3'. Have. Note
that electric terminals 2'-1, 2'-2, 3 'are pulled out from both end surfaces and the middle point by
laminating the piezoelectric sheets 1 of two sheets in reverse with the polarization directions ?
night. Similarly to (where q is a side view in the case of increasing the thickness of the dovetail
sheet, it is taken out), the negative electrode terminals 2'-1, 2'-2, 3 'are drawn out.
2 has an acoustic impedance density close to the acoustic impedance density of the medium
using the piezoelectric sheet of the shape shown in FIG. ! FIG. 7 is a structural view showing a
state in which the material I is covered with water tight so as not to leave air bubbles or an air
layer. Next, the principle of operation will be described. The acoustic impedance density (1, 6 О
10 'to 2.3 О 10' (gr / cm 2 s)) of the pressure sheet 1 is that of water (1, 5 О 10 '(gr, -3-).
7cm2s): very close to l. 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 piezoelectric sheet in FIG. 3 (8) is in the
state of (iii). Where X is the axial position and p is the sound pressure. Assuming that the
thickness of the piezoelectric sheet is tl + t2, respectively, the pressure in the piezoelectric sheet
is pt, pt. ???? This means that the thickness' l + F of the piezoelectric sheet changes due to
the sound pressure, and it can be seen that an output voltage proportional to 'l + Pi' is generated
between the electrical terminals 2 'and 3'. Although the above description has described the
structure in which the entire outer surface is in contact with the sound field, the structure may be
such that the entire or a part of the surface other than the two opposing surfaces is acoustically
dialyzed. According to the W road of the present invention in the above stock, the delivery signal
output can be used as a wave receiver having good wave receiving sensitivity by taking the
delivery signal output from between the electric arms 2'-1 and 2'-2. Also, by short-circuiting the
electric terminals 2'-1 and 2'-2 and using this and the electric terminal 3 ', the impedance
between the terminals 2'-1, 2'-2 is 4-compared to the impedance between the terminals 1/2. It
can be used as a gL unit that has a long transmission sensitivity that drops to 4. Further, due to
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its structure, it is possible to easily obtain a low-loss transducer with less weight and less
reflection 5 of the rod compared to the conventional vibrator, which can withstand external
water pressure.
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