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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an ultrasonic wave
transmitter-receiver according to an embodiment of the present invention, and FIG. 2 is an
attenuation characteristic diagram of the ultrasonic wave transmitter-receiver. 1 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 и и и и и и и и и и и и и и и и и и и и и и elastic Adhesive, 6
ииииииииииииииииииииииииииииииииии Lead wire, 8 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer using a piezoelectric wedge 6 plate, and provides an ultrasonic transducer having
high sensitivity, high sound pressure, and quick movement and ? ? attenuation. It is
Hereinafter, an embodiment of the present invention will be described (with reference to FIG. 1).
In FIG. 1, reference numeral 1 denotes a terminal plate, and the terminal plate 1 is fixed to the
lower part of a cylindrical case 2. '! ! 3t 3 'ul terminal embedded in the terminal plate 1, 4 is a
piezoelectric ceramic plate, the upper I of the piezoelectric ceramic plate 4, the lower surface 3C) C2' 'is provided with electrodes. Reference numeral b denotes a tangential contact agent for
supporting the piezoelectric ceramic plate 4 on the terminal plate 1; and 6, a truncated coneshaped resonator having a large viscous damping resistance such as synthetic i7. The bottom
surface is bonded to the top surface of the king piezoelectric ceramic plate 4 to form an Iinari
oscillator. 7, 7'.mu. Lead wires for respectively contacting the electrodes of the piezoelectric
ceramic plate 4 with the terminals 3, 3 '. The length 8 is provided at the upper opening of the
case 2. As shown in FIG. A composite vibrator comprising the piezoelectric ceramic plate 4 and
the resonator 6 (or a vibrator having a vibration mode), and an electro-mechanical energy
conversion function. Therefore, an external sound wave is generated to generate an electrical
output having the resonance frequency and to take out an output signal between the terminals 3
and 3 'through the leads 7 and 7'. Can. Conversely, if an electrical input is applied between the
terminals 3.3 ', the composite vibrator vibrates mechanically in accordance with the frequency of
the composite transducer to generate a sound wave of that frequency. In this type of ultrasonic
transducer, for example, in the case of pulse driving using as a transmitter 1, in order to shorten
the pulse interval, the damping time of the vibration must be made fast. Also, even when used as
a receiver, it is necessary to shorten the attenuation time to obtain many signals in a short time.
The resonator 6 has a truncated cone shape for matching the impedance of air and the
mechanical impedance of the composite vibrator to improve the sound pressure and sensitivity.
The resonator 6 is made of a material such as a synthetic resin having a large viscosity damping
constant in order to accelerate the decay time without attenuating the sound pressure and
sensitivity in consideration of the above-mentioned points. The displacement X is expressed by
the following equation in the case of a free-shooting system having viscosity or decline to -W.
?????? ?. ?? 28-0 d12 dt X: displacement t: time 2? ?>. C: viscous damping constant
m = mass Wn: natural circular frequency vO: initial velocity where it is possible if ? <wn x = e ?
? ? ? ?-a-sin-qt (however, initial value xo = o? = a) 4?> In the case of Wn, X = e "? -aginhqt (however, initial value xo = o-== a) In the case of ? = Wn One ?tx = e-a-q + (note (, initial
value xo = o-"-a As described above, it can be seen that the greater the value of x'd.epsilon.
In order to increase ?, jdm may be decreased or C may be increased. The synthetic resin
generally meets this condition for metals, and therefore, in FIG. 1, the material of the truncated
cone-shaped resonator 6 is not metal but synthetic resin, so that the ultrasonic transducer has a
fast decay time. Can be obtained. FIG. 2 shows the attenuation characteristics of the ultrasonic
transducer. In FIG. 2, A is the characteristic when the resonator 6 is made of metal, and B is the
characteristic of the present invention where the resonator 6 is made of synthetic resin.
Therefore, according to the present invention, the decay time is fast. The present invention ? -F
is as described in the following. и The present invention: The sound pressure and sensitivity are
excellent, and an ultrasonic transducer having a short decay time is used. ?
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