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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are longitudinal sectional views
showing the main part of the underwater ultrasonic transducer according to the present
invention. In the drawings, reference numerals indicate the same parts. DESCRIPTION OF
SYMBOLS 1 ... ultrasonic transducer, la, lb ... electrode surface, 2 ... acoustic reflection member, 3
... insulated wire, 4 ... molding material, 5 ... protective case, 5a, 5a '... Notch on lower end face.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer used in water such as a sounding instrument, a fish finder, etc. An embodiment of the
drawings will be described below. Fig. 1 shows one embodiment of the present invention,
wherein 1 is made of a lead zirconate titanate-based compound and both main surfaces are poled
with an electrode surface / at / b by silver baking etc.) Sound wave vibrator, 2 is a sound
reflecting member made of a porous material such as cork, foam rubber, etc. disposed on the
outer surface except one electrode surface (/ b 儒 in the figure) which becomes the sound
transmission / reception wave of the vibrator Insulated electric wire consisting of a pair of lead
wires J & r 71) connected to both electrode faces / as / b of the vibrator, and the part covers and
protects a part of the vibrator 11 acoustic reflection member co and the insulated electric wire 3
in a liquid tight manner Insulating mold material% such as synthetic resin or rubber Shows a
protective case made of metal or hard synthetic resin for covering the outer surface of the
molding material, and protects the ultrasonic vibrator l provided with the insulated wire 3 and
the acoustic reflection member as in the prior art. Case! After being set inside, it is integrally
formed by insert layering that injects mold material 亭 O melt, but in this example, the lower end
face of the protective case I covering the outer surface of the O mold material gauze is entirely
covered. Cut across! aしたもOである。 An underwater ultrasonic transducer in which a
protective case is conventionally coated on the outer surface of an insulating mold material of
this type-) has a protective case as shown by a dotted line! The entire outer surface of the
molding material is coated so that the lower end surface of the molding material is flush with the
outer end surface of the bottom surface of the molding material a, which is the wave transmitting
/ receiving wavefront, while the bottom of the molding material $ Needs a wall thickness
sufficient for water pressure, so the lower end face of the protective case inevitably falls within
the directivity range of sound wave θ and part of the sound wave transmitted through the mold
material is the mold material and acoustic impedance It has the disadvantage of propagating and
leaking to different protective cases and causing noise. Although the above-mentioned defects
can be solved by enlarging the molding material and the replacement case, in this case, there has
been a complaint that the size is increased. On the other hand, in the present invention, the lower
end face of the protective case j which covers the molding material is cut out j. As a result, since
the sound wave can be positioned outside the directivity range of the sound wave, the sound
wave can be prevented from propagating and leaking to the protective case without increasing
the size. Thus, the notch 1 in the lower end face of the protective case 1) p) j is the bottom 4 of
the molding material to be the transmission / reception wave front of the sound wave! Although
it is desirable to be as small as possible in order not to exert the influence of water pressure from
the outer periphery on a, as shown in another embodiment of the present invention in FIG.
With the lower surface of the mold being flush with the bottom of the mold gauze and in a good
condition, the inner side of the lower end face is tapered notches 14 to prevent sound wave
propagation and leakage to the protective case with certainty from the outside Has the effect of
completely eliminating the influence of water pressure.