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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an ultrasonic ultrasonic transducer
according to the present invention, FIG. 1 is a front sectional view, and FIG. 2 is a bottom view.
DESCRIPTION OF SYMBOLS 1 ... Piezoelectric ceramic vibrator, 1a ... Sound radiation surface, 2 ...
Vibration absorption material, 4 ... Insulation case, 4a ... Outer bottom face, 4a '... Cutting away.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer used by immersing it in water, such as a fish finder and a sounding instrument, and
an embodiment of the drawings will be described below. In the drawing, I represents a zirconate
titanate; a lead acid etc., both WK baked by etc.) a piezoelectric ceramic vibrator with electrodes
la and / b attached, an acoustic radiation surface of an -2 紘 皺 vibrator (electrode A vibration
absorbing material made of a porous material such as cork, foamed rubber, etc., disposed on the
outer surface excluding the / a side), J is a lead wire Ja + Jb "(2)" connected to the electrode / a,
lb of the vibrator In a covered electric wire consisting of a gauze, a vibrator l, vibration and
vibration absorption coco and a part of the covered electric wire 3 in a liquid-tight manner, the
acoustic impedance of water and #l being the same insulating case made of synthetic rubber,
synthetic resin, etc. In the present case, the insulating case covering the acoustic radiation
surface / a of the above-mentioned vibrator is attached to the outer surface 4'aK of the abovementioned vibrator. It is provided. Conventionally, this type of underwater ultrasonic transducer
is designed to radiate a sound wave into the water from the acoustic radiation surface of the
piezoelectric ceramic vibrator through the bottom of the insulating case covering the radiation
surface, but this sound wave is not attenuated Although it is necessary to set the thickness
dimension of the bottom of the insulating case to a half-wave integer multiple of the operating
frequency of the vibrator in order to transmit light, the above setting is constant because the
frequency fluctuates due to variations K such as manufacturing conditions. It was difficult.
However, as described above, since the present invention provides a cutting margin on the outer
bottom surface of the insulating case, it is sufficient to grind the cutting margin according to the
fluctuation of the frequency. It can be adjusted, and has a great effect of significantly improving
and improving the yield of the product.