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DESCRIPTION JPS57138233

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DESCRIPTION JPS57138233
?? A: A underwater transducer characterized in that an organic piezoelectric material is bent in
a plane in one direction including at least an axis. Detailed description of the present invention
The present invention provides an organic pressure '-body comprising a polymer piezoelectric
material having high resolution or a polymer piezoelectric material and a pressure m porcelain
material with a wood of a tree. The present invention relates to an underwater transducer used.
Conventionally, as the transducer of this pole, the inventors of the present invention remove the
reflection of the sound caused by the sound impedance = y mismatch by the inventors of the
present invention, and the assembly and transportation 1 assembly can be quantified, and 'jIL
pregnancy To obtain an M-piece underwater transducer whose reduction is shown in Fig. 1,
electrodes are provided on the inner and outer surfaces of the piezoelectric body. Furthermore, it
is known that the whole city has several structures between the both ends or the entire outer
surface using an insulating material that is transparent in terms of sound%. However, when it is
desired to take a large length for the purpose of lowering the electrical impedance, these are
straight in shape, and since their shape is linear, the desk board whose sensitivity is equal to that
of one wave of acoustic waves is a desk There was a wandering limit. The sound pressure
distribution is positive f, rippling, and it is caused that the sound pressure amount is scooped up
from the upper part of the sound pressure amount or one growth anal. The finger of the fc
impression also the company which became the next pattern from the straight-shaped form
became the lighting which there are few free k. The present invention is intended to obtain a
car's nausea impedance and (--the company can be obtained by shouldering an ugly piezoelectric
body with a wedge d which has an appropriate length component shorter than one wavelength.
In other words, non-redundant clarifies the readability of the organic piezoelectric material and
incorporates the 52 waver axis into a two-dimensional structure by bending it into a thousand
cabinets, or even in the other half including @. A three-dimensional structure is to be insisted by
bending the tongue. Next, an example of the arrow of the present invention will be described.
FIG. 1 shows the present invention according to the first embodiment of the present invention, in
which the piezoelectric body l is configured in a triangular shape having a length W of 10,000 in
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EndPage1 of @ 4 and a length l of n and yi in the month direction. It is a thing. Here, 2 is an
internal conductor, 2 'is an output terminal thereof, 3 is a surrounding conductor 31 is an
output-pole thereof, and a broken line 5 is an insulator around the piezoelectric body 1. Next, the
principle will be described with reference to FIG. Now, assuming that the plane wave comes from
the direction of arrow 6, let the position t of the sound wave propagation direction (direction of
arrow 6) at this time be X in the coordinate, let the sound pressure be p in the coordinate, and
Suppose that it is in the state of 2 (b). In FIG. 2 (to), ? ? I 02 is an angle formed between the
direction of the sides 7-1 and 7-2 of the piezoelectric body 1 and the arrow 6. 1 ? ? and 1w are
the side lengths of 7-1 and 7-2, and the hill is the radius from the central conductor to the
peripheral conductor l.
Here, assuming that the unit length is X and ?X ?, the difference in sound pressure between
them is ?p, and ?r ? L is indicated by vector 8. The sound pressure component in which n is
squeezed in the end face direction of the side 7-1 is the vector 9, ie, the vector Bx cos ?, and the
sound pressure component applied in the radial direction of the piezoelectric body is the vector
10, ie, the vector 8 X sin ? ?. In addition, the sound pressure component 13 obtained by
multiplying cos ?1 by the voltage px?pxel) myp4 exemplified at the position of each X step sXz
+ XBvX4 is continuously distributed in the radial direction. G constant of the piezoelectric body
in the longitudinal direction g3. The output voltage obtained between terminals 2 ? ? t 31 at
this time is vector 9 О g 3 ? О 1 ?, vector 10 О g, xRe vector l IX g, ? О l # I vector It is
determined by a parallel circuit of five equivalent circuits having a vector 13 О R at the valley
position on 12 О g, X and h ?, 11 at a valley position. However,% conversion of sound pressure
distributed on 1 ? ? и l ░ is a low frequency that can be approximated by a straight line. As
described above, it can be seen that the larger the dimensions of l ', l' and 9 the better. It is also
understood that the sensitivity in the% direction can be improved by changing the propagation
direction of the sound wave and the bending direction of the piezoelectric body. The above has
described the case of bending in a triangular shape, but it is obvious that various flaring methods
are considered. WJ3 is sinusoidally bent in the vertical plane including the weir 4 in the second
embodiment. By increasing the length W in the axial direction, the sensitivity in the axial
direction is improved, and the change in directivity pattern is made monotonous by bending in a
sine wave shape. FIG. 4 shows the structure of the third embodiment in which the second
embodiment is folded 22t, and the sensitivity and directivity are the same, but the electrical
impedance is 100, and it is necessary to increase the number of connections to n. -It is
advantageous to build a circuit. FIG. 5 shows that the second embodiment is bent in the vertical
plane in the fourth embodiment v, while this example is bent in the horizontal plane. While the
sensitivity in the vertical plane is high in the second embodiment, the sensitivity in the horizontal
plane is high in this example. FIG. 6 shows the fifth embodiment, in which the sensitivity is
enhanced in the vertical plane and the horizontal plane by integrating the second embodiment
and the fourth embodiment with one piezoelectric body. is there. As described above, although
the coaxial piezoelectric material has been described as an example, the same effect can be
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obtained by using piezoelectric materials of other shapes, and it goes without saying that a
combination thereof may be used. FIG. 7 shows a sixth embodiment showing an example thereof,
in which the piezoelectric body of the ribbon is formed in a triangular shape as in the
embodiment of WJl.
As described in-, when the wavelength is longer than one hundred wavelengths, there is no effect
in improving the sensitivity, but 'is effective in reducing the air impedance. Also, although the
receiver has been described as an example, the same effect can be obtained as a transmitter.
According to the present invention, by bending a long readable piezoelectric material as
described above, it is possible to realize low electrical impedance, high sensitivity, and desired
directivity.
4, Brief description of the drawings Fig. 1 and Figs. FIG. 2 is a diagram showing l +, and FIG. 2 is
an explanatory view of the principle of the present invention. 1 и и и Piezoelectric body, 2 и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и show the axis Center line. 5
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Side length 8+, 9jlO + 11 + 12s13 ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? half t4sp ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ti1.?1.?2 ? ? ?The angle between the direction of the sound wave and the
side. EndPage: 2 f Figure 4 Figure 4 End Page: ?
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