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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
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 .