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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view of the underwater
ultrasonic transducer of the present invention. 1 и и и Piezoelectric electrostrictive element, 2a, 2b 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 rubber case, 4b и и и и и и и и и и и и и и и и и и и и и и 4b 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 5c и и и и и и и и и connection of the rubber cable outer
periphery, 6 и и и и и The fusion of 4a and 5c above.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater
ultrasonic transducer for use in a fish finder, a sounding instrument, etc. Watertightness at the
joint and pull (1) "47") tension e, *, is a nine-sonic ultrasonic transducer with improved rigidity.
This will be described below with reference to the drawings. In 1st II, l is an O material such as
lead zirconate titanate, and chain electrodes coa and cob are attached to both sides thereof, and a
polarization electric layer 1 plate-like piezoelectric electrostrictive element, J is a piezoelectric
electrostriction Element IO sound wave transmitting / receiving surface and 1 are arranged so as
to be written on the outer peripheral picture except electrode surface 2a 9 material with low
acoustic impedance, such as sponge, cork etc. 1 sound wave 1kIIL member, dream is
piezoelectric electrostriction A rubber case made of synthetic rubber such as WW prene rubber,
etc., and a protuberance of the rubber case O rubber case, which feeds the element l and the
sound wave ll lumber J with water. A rubber cable for signal transfer, in which a pair of cables 6
? jarjb connected to each other and connected to an electrode drawing -a of the piezoelectric
electrostrictive element l and covered with an insulating covering material IO of synthetic rubber,
respectively, The inside part a of the protruding part is inserted. Conventionally, the bonding
between the inner surface of the protruding part of the rubber case and the rubber cable bonding
part, the local station I, is achieved by applying and adhering an adhesive of epoxy resin to the
interstice between the two, which is time-consuming In addition, the bondability of the joint is
insufficient11, due to the deterioration of the adhesive due to moisture in the long-term use,
tension, twist),-and other strength decrease may cause pull-out) There was a point 1II- such as
deterioration of the electrical performance due to slight immersion water from between ones of
the nine adhesives. The present invention can eliminate such a defect, and in the structure of FIG.
1, the material of the rubber case is made the same as the material of the covering material jQ of
the rubber cable, and the protruding portion iii # a of the rubber case and the rubber cable In the
conventional manner, the joint with the outer peripheral portion IC is vulcanized in a
conventional manner to be fused together to form a strong 1iiK bond. Therefore, the mechanical
strength of the joint portion between the rubber cable and the rubber case of the underwater
ultrasonic transducer according to the present invention is strong, the pulling out of the rubber
cable is eliminated, and the electrical performance due to water immersion is also impaired.
Absent. The IKII manufacturing process is also labor-saving, leading to cost reduction. Various
effects can be achieved 4h (Kikuto. Brief description of the drawing Fig. 7 also shows the
underwater ultrasonic transmission / reception performance 1lIO1EW1'0 according to the
present invention. 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 sound absorbing
material, reference и и и и и и и и и 5 ░ ░ ░ 1 "+-xsm group" ░ ░ ░ l di ring, / / IN IN, '... rubber
cable, jo ... rubber bag и-?-pull connection outer periphery, 1 ... the above a and !
0 and O fusion department practical organization cabinet--, Japan special pottery stock threat
company 7, representative Ogawa Shuhisa) Figure 1 5C 4a 562 b '7.2 a 5 b' 5 a 79 3 '? e =
Seasonal sea bream (Ritsui l jump into the number of ships to towing boat и A и) и 4 offensive 32 ,.
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