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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views of an
underwater ultrasonic transducer according to the present invention. P иииииии Ultrasonic
transducer, 5 ииииииииииииии Float.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer used by immersing in water, such as a fish finder and a sounding instrument.
Following this, this type of ultrasonic transducer was installed on the ship and used, and it was
very troublesome to move the city longitudinal hull in case of fish O detection or water depth O #
I footing. It was O. The proposal solves such a drawback, and will be described below with
reference to FIG. In the drawing, P indicates an ultrasonic transducer, and electrodes / &, / b are
attached to both surfaces, and the outer surface excluding the electrostrictive transducer l and
the transducer O acoustic wave transmitting / receiving surface (electrode / & side) is enclosed.
Vibration absorption (1) of the porous member (1) ? (1j member-and the insulating outer shell 3
which covers these in a liquid tight manner, and the both-side electrode / JL of the vibrator, / BK
is composed of a lead wire da and a lead wire lead out to the outside. A floating member for
immersing and holding the ultrasonic transducer P below the surface of the water, as shown in
FIG. 1, is a hollow closed cylindrical shape, and the back surface (the opposite surface of the
acoustic transducer / b side) K of the transducer is fixed Alternatively, as shown in FIG. 2, the
open end is formed in a liquid-tight manner on the outer peripheral surface of the transducer P
as a bottomed cylindrical shape. In the case of the first figure, float the cable gauze of the
transducer P! It pulled out outward through the hollow part ta of. Although the one having the
hollow portion 11 is used as the float j in FIGS. 1 and 2, it is also possible to use one having a
sufficiently low specific gravity such as a styrofoam, wood, etc. As described above, the ultrasonic
wave of the present invention Since it is used by floating on the water surface, it has the effect of
making detection of fish schools and measurement of water depth easier than before. ???
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