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111111. . 1. ll'11111 ',', 111j 斜 directional directivity "-i" c17-i '/, 1: is ::, ", Il,' lll ',' l'll'l ', □" o
special No. 45-108 914 6 '°' °°°°° '3 °° "0 inventor Terumi Saeki-" "□ Aoki Kodocho,
Honjo Town, Toho Ward, Kobe City, · · · ·-: 1 '1 □' □: 1 1 Shin Miwa Industrial Aoki dormitory
No. 302 Doujin Kawabe Shigeo Takarazuka Circumstances 2 5 @ applicants Shin Meiwa
Industrial Co., Ltd. Nishimiya City Nishine City 1 5 Sone 25 25 General practitioner for law-one
other person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an example of
a conventional underwater microphone, FIG. 2 is a perspective view of an embodiment of the
present invention, FIG. 3 is a sectional view taken along line A-A of FIG. FIG. 4 is a cross-sectional
view similar to FIG. 3 of another embodiment.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional
underwater microphone. Conventionally, piezoelectric elements such as various magnetostrictive
vibrators, Rochelle salts, barium titanate porcelain, etc. are used for the underwater microphones,
and there is no directivity, and to provide directivity, each of a plurality of microphones arranged
in a circle is used. There is a drawback that the structure is complicated and expensive because
the output is phase-synthesized using a delay circuit. An example of a conventional underwater
microphone using a piezoelectric element is shown in FIG. 1. In the figure, 1a is a piezoelectric
element, 2a is a diaphragm, 3a is a sealed case, and the vibration of diaphragm 2a due to sound
pressure is a pressure It is converted into an electrical signal by the electron 1a. In this case, only
the sound pressure perpendicular to the diaphragm 2a was detected, and there was no directivity
at all. However, in the case where it is necessary to detect not only the magnitude of the sound
wave but also the direction of the sound source in water, the present invention is intended to
provide a directional underwater microphone in response to this request. The present invention
will be described with reference to the embodiment of FIGS. 2 and 3. Reference numeral 1
denotes a relatively heavy metal closed cylindrical container in which bimorph-type piezoelectric
elements 2 projecting in the direction of 90 degrees in the longitudinal direction are fixed to
each other. There is. 3 is a cable for suspending the cylindrical container 3 underwater. When a
sound wave comes in and strikes the piezoelectric element 2, the cylindrical container 1 is heavy
and hardly vibrates depending on the sound pressure, so the piezoelectric element 2 vibrates
relative to the cylindrical container 1 and the magnitude of the vibration Since the dimension is
determined by the area of the piezoelectric element 2 and the incident angle of the sound wave
to the piezoelectric element, each piezoelectric element has an eight-shaped vibration directivity
characteristic maximizing the direction perpendicular to the surface. Therefore, by combining the
directional characteristics of each of these piezoelectric elements, a more sensitive directional
characteristic can be obtained, and according to this, the magnitude of the sound pressure and
the direction of the sound source are detected by the electrical signal converted from the
vibration of each piezoelectric element. be able to. In the other embodiment shown in FIG. 4, the
vanes 5 projecting in the direction of 90 degrees to each other in the longitudinal direction are
fixed to the circumference of the metal closed cylindrical vessel 4 and each vane is attached to
the inner wall of the cylindrical vessel 4 Four bimorph-type piezoelectric elements 6 are
protruded and fixed in the center direction in the same direction as 5 and a weight 7 is attached
to the tip of each piezoelectric element 6. When a sound wave strikes the vanes 5, the cylinder 4
produces a vibration of a size determined by the area of the vanes 5 and the incident angle of the
sound waves as in the embodiment of FIG. In order to be stationary due to inertia, the
piezoelectric element 6 is distorted by the vibration and motion of the cylindrical container 4 to
generate an electric signal. Also in this j embodiment, since the vane 5 has the same
directionality as the piezoelectric element 2 of FIG. 2: the piezoelectric element 6 also has the
same directivity as the wing and the plate 5'5, and the embodiment of FIG. A directional
microphone can be obtained as described above for the example.
When the microphone of the present invention is suspended in water, the piezoelectric element 2
or 6 is in the vertical direction, and it has directivity in the horizontal direction and does not
receive sound waves from the vertical direction. It is possible to reduce the reception value of the
interfering sound wave emitted from the hull EndPage: 1 to several hundreds of that of the signal
sound wave, and therefore to receive the weak sound wave coming from the horizontal direction
sharply. In addition, since the structure is extremely simple, if it is used for a sonar, sonobuoy,
etc., there is an excellent effect such that an excellent performance sonar, sonobuoy, etc. having
directivity can be manufactured inexpensively. In the above embodiments, four piezoelectric
elements are used in 11 □□□-,,. However, using two or four or more piezoelectric elements
perpendicular to each other has the same function and effect as described above.
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