Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS5514386 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an ultrasonic ultrasonic transmitterreceiver according to the present invention, wherein FIG. 1 is a sectional front view and FIG. 2 is a sectional view taken along the line E in FIG. 1 ················································································································· Piezoelectric element 4 • ····· Vibration absorption member 6 ······· Mold material , 7 ... ... post. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic transducer used by being immersed in water such as a fish finder, sounder, etc. The drawings will be described below. In the drawings, reference numeral 1 denotes a bending vibrator in which a piezoelectric element 3 having a diameter smaller than this is integrally attached to a diaphragm 2 made of metal or the like. 4 is a vibration 1-/-/ ¥ 3 ν absorbing member disposed on the outer peripheral surface of the piezoelectric element 3 which is the sound reflecting side of the flexural surface vibrator 1, which has a thick sound attenuating effect, such as cork, sponge, etc. Made of flexible and porous material. A concave case 5 accommodates the bending vibrator 1 and the vibration absorbing member 4, and a resin 6 that is injected and formed in the case 5 and seals the vibrator 1 and the absorbing member 4 in a liquid tight manner. The mold material is the conventional structure up to this point. Thus, according to the above-described conventional transducer, a large water pressure (arrow P) acts on the transmission / reception wavefront 6a at the lower end when used deeply immersed in water, and the molding material 6 in the case and the vibration absorbing member inside thereof 4 is compressed, but at this time the flexible and porous vibration absorbing member 4 is densified and hardened, and only the vibration damping function is The resonance system length l, which became to work at l, had the drawback of changing the horse-horse wave number longer than the real fishing system. The present invention is made to solve such a drawback, and as shown by the number 7 in the same figure, on the vibration 2-node portion of the projecting edge 2a of the diaphragm 2 of the bending vibrator 1 A plurality of support columns which abut on the inner side of the concave case 5 are 04-05-2019 1 erected. However, according to the present invention, the water pressure acting on the transmission / reception wave surface is blocked by the support and is not added to the vibration absorbing member, so that the present invention has an excellent effect of eliminating the conventional defects due to the compression hardening of the vibration absorbing member. In the figure, reference numeral 8 denotes a covered electric wire having lead wires 8a and Bb connected to electrodes (not shown) of the piezoelectric element 2 and is drawn outward from a conduit 5a protruding from the center of the outer end face of the concave case 5 . 04-05-2019 2
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