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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a
conventional sealed ultrasonic transducer, and FIG. 2 is a longitudinal sectional view showing one
embodiment of the present invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · waterproof tape.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a w to m @ sound
transducer which is used by immersing in water such as a fish finder or a deep sea device.
Conventional O! 1) As shown in 7 @@, 1) rubber-based material> in the inner case of the lower
case 10 formed in a concave shape, such as lead zirconate titanate, etc.) ja, Jb attached, and the
piezoelectric vibrator 3 is bonded to the electrode 3a of one side in a sound wave transmission /
reception direction l) /,-and formed in the opening of the lower case l more concavely than the
rubber material The opening portion of the upper case λ is abutted and adhered by adhesive
gauze so that the piezoelectric electrostrictive element 3 is sealed by the adhesive K to form a
nine structure. However, according to the ultrasonic transducer of the above-described
conventional structure, a gap due to no adhesion exists in the exposed part of the joint between
the upper case core and the lower case l, or a crack occurs in the bond 11 due to water pressure.
When it occurs, there is a problem that water penetrates from there and impairs the electrical
characteristics of the piezoelectric vibrator. The idea is round to solve this problem. That is, as
shown in FIG. 2, the main part of the present invention is shown as shown in FIG. 9, by directly
connecting the upper case co and the lower case l at the joint m-forming a shallow
circumferential groove co 5L, / & The waterproof tape 1 is wound and integrally bonded by
vulcanization. The threshold value j in the figure is the electrode Ja of the piezoelectric vibrator,
followed by JbKli, and nine pairs of lead wires! It is a coated cable which leads a and jb to the
upper case core (4 through the outside, and the same numbers in the drawings indicate the same
parts. According to the above communication solution, since the joint surface between the upper
case and the lower case can be liquid-tightly covered with a waterproof tape, the effect of
blocking the entry of water and surely preventing the electrical accident of the piezoelectric
vibrator There is.