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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a front sectional view of an ultrasonic wave receiver, and FIG. 2 is a perspective view
from the lower side of a piezoelectric transducer. DESCRIPTION OF SYMBOLS 1: .. Piezoelectric
vibrator, 2, 2 '... electrode, 2a, 2b ... split electrode, 4 ... insulation outer shell.
Detailed description of the invention The present invention relates to an ultrasonic transmission /
reception 1IhK for fish cleaning, and in particular, an ultrasonic transmission / reception formed
by sealing a piezoelectric vibrator operating at two different frequencies with an insulating shell).
It relates to a wave. This type of ultrasonic transducer can exhibit two low ultrasonic frequencies
by using one piezoelectric transducer (1) and zero, rounded, dual frequency (for example, jOKHz
and co-ooxHm) simultaneous recording Although it is suitably adopted for a fish finder by the
cost method, generally the directivity angle (detection range) of the ultrasonic wave irradiated
into the water from the sound wave transmitting and receiving picture of the transducer is
inversely proportional to the resonance frequency of the piezoelectric imaging element. As
described above, in the case of emitting ultrasonic waves of two different frequencies by each of
the piezoelectric transducers, there is a drawback that it is difficult to perform accurate fish
school detection because the directivity angles are different. On the other hand, it is also known
that the above-mentioned ultrasonic directivity angle is formed on a piezoelectric insulator O
sound liquid transmission / reception picture when the resonance frequency is constant and is
proportional to 1 on both sides of the current. Based on this finding, the proposed method
divides the electrode formed in the sound wave transmission and reception image of the
piezoelectric vibrator into two parts, and operates with a small number of divided electrodes
when operating with a small number of peripheral liquids. Uses one of the divided electrodes and
the area of the one divided electrode at one time using the number of divided electrodes 9 and 1!
! O ultrasonic finger and flesh angle is to be set to ypil and other large magnitudes (by → to be
able to accurately detect all fIL group detections always under a constant pointing angle
regardless of the change of frequency, An embodiment of the drawings will be described. In the
drawing, l is a piezoelectric vibrator in which one surface is an acoustic wave transmitting /
receiving surface and the other surface is an acoustic wave reflecting surface, electrodes λ and 2
'are provided on each surface, and polarized to operate at two different frequencies, In this case,
the thickness and diameter dimensions are set to required values, respectively, and they have a
nine-disc shape, and both vibration modes in the thickness direction and radial direction are
used. 3 is a vibration reflection member made of a porous material having a low acoustic
impedance such as a sponge, a cork, etc. disposed on the outer surface of the piezoelectric
vibrator except the sound wave transmitting / receiving surface (electrode core side); It is an
insulating outer shell made of rubber or synthetic resin equal to # 1 and equal in acoustic
impedance to the liquidus covering the entire circumference of the peristaltic reflection member
3. The description in this section is conventionally known. Is formed on the sound wave
transmitting / receiving surface of the piezoelectric vibrator and divided into nine electrodes-for
example, as shown in FIG. 1 i # and (3) there is a center electrode 2a and an outer peripheral
electrode surrounding it. And the area of the central electrode core a (may be the outer
peripheral electrode core b) simultaneously with the use of one of the electrodes The corner is
set to the same size.
Note that ja and j1) * are formed on the sound wave transmitting / receiving surface of the
center electrode core & formed on the sound wave transmitting / receiving 1flK of the
piezoelectric vibrator and the sound wave reflecting surface and each one end is connected to
nine electrode cores , Insulate the other end from outside shell ginseng !! sK I'm out. According to
the present invention, according to the above embodiment, when operating the ultrasonic wave
transmission / reception area at a low frequency, the sound wave reflection surface is generated
by using both the circular center electrode and the outer peripheral electrode of the acoustic
wave transmission / reception 1mK type of the piezoelectric vibrator. The KfJ is applied between
the sound-reflecting electrode and the electrode by applying a signal between the electrode and
the electrode, and operating the transmitter / receiver at a different frequency by using only the
center electrode. Use of ultrasound O pointing angle emitted from the waver Frequency variation
l! It is self-evident that it is always constant ←) regardless of. Therefore, in the case of using the
ultrasonic wave transducer of the present invention for the two horse wave type fish group
holding machine 9, even if the frequency is changed, the ultrasonic pointing angle is always
constant, so that there is an advantage that accurate fish detection can be performed .
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