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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
a conventional two-element ultrasonic transducer, FIG. 2 is a frequency-impedance characteristic
curve of an ultrasonic transducer, and FIG. FIG. 4 is an electric circuit diagram showing the
configuration of one embodiment of the present invention, and FIG. 4 is a voltage-current
characteristic curve of a silicon diode. 12, иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Ultrasonic
transmission elements, 13 иииииииииииииииииииииииииииииииииииииииииииииииииииии Silicon diodes, . Fig. 2-181-Japanese Utility
Model Application No. 50114279 (2) Fig. 3 Fig. 4: 1 correction 49.5. ??
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-element
ultrasonic transducer in which a transmission Tachikawa element of an electrostrictive ultrasonic
transducer and an element dedicated to reception are integrated. 2 is a cross-sectional view of a
two-element ultrasonic transducer user: 1 is a frame of a transducer, 2 is a transducer for
transmitting only, 3 is a transducer for receiving only, 4 ░ 5.6.7 The input and output terminals
of the elements 2 and 3 are shown as terminal lead wires in the figure. However, terminals 5 and
7 have common terminals (5 'can also be used. Thus, the conventional one has four or three
terminals (1), and is it necessary to connect a cable to each? In order to explain the necessity of
providing 3 + 1 rrl to 4 input / output terminals as described above, first, FIG. In the
characteristic curve shown by the solid line in the curve number of the harmonic wave vibration
element, if the frequency fr is antiresonance between the resonance bonds 6 E in the
characteristic curve indicated by the solid line, the impedance of the vibration element at the
resonance point fr Is the most efficient one, and the impedance is maximum at anti-resonance
?fa. It is known that the transmission frequency of the ultrasonic transducer is at most 1 h at
the resonance frequency where the transmission frequency is 16 dB or less, and the reception
sensitivity is the non-resonance frequency where the impedance is maximum. Therefore, as
shown in Fig. 3 where the frequency characteristics of the ultrasonic transducer are maintained,
the frequency fr is an anti-resonance point and the impedance becomes maximum 1 at this
frequency fr, thus the frequency amount 3 is As a resonance point to this one at wave number f3
is either ideal or 1 О Q (lK), the wave received by this ultrasonic vibration element! The
sensitivity is maximized at the same wave number fr (2). Therefore, the frequency e-impedance
characteristic of the transmission ultrasonic transducer of the transducer is indicated by a ridge
line, and the same wave number-impedance characteristic of the ultrasonic transducer for
reception is indicated by one-day training. It is possible to maximize the transmission and
reception sensitivity when this transducer is used at the frequency fr-but when using such a
device, it is possible to transmit at the frequency or fr. The impedance of the wave-dedicated
ultrasonic element is about several tens of ohms to several hundreds of ohms, and the impedance
of the receive-only ultrasonic element is of the order of kilokiloohms to several hundreds of
kiloohms. The impedance is much greater than the impedance of the receive-only element or the
impedance of the transmit-only element at the used frequency, as each of the above-mentioned
jets is designed. Therefore, if the picture elements are connected in parallel to the common
terminal, the sensitivity of the wave receiving element significantly lowers due to impedance
mismatch, and it can not withstand use. In consideration of the above, (3) 1-1.
The object of the present invention is to provide an ultrasonic transducer in which two input /
output terminals are provided in a single integrated element of an ultrasonic wave transmitting
element and an ultrasonic wave receiving element. By using two terminals, the number of cables
to be connected will be two, four, and each cable will be about 10 meters or so. The cost of the
cable is reduced within four cylinders compared to the one of the secondary flame to be treated,
and the wiring is for the wiring to the ultrasonic transducer having one vibration element used
for both transmission and reception. FIG. 3, which will be described below in detail with
reference to the embodiment illustrating the present invention, is an electric circuit diagram
showing the configuration of one embodiment of the present invention, where 11 is a twoelement r. Shaped ultrasonic sound his transtube, 12 is an electrostrictive ultrasonic wave
transmitting element, 13 is an electronic ultrasonic wave receiving element, 14.15 + 1 each is a
randomizing diode, 16.17 is an input / output end (one transmission. Element 12 and the
receiving element 13 (4 "Is is Tadasa contact between input and output in series terminal 16.17.
The diodes 14 and 15 have different polarities 111: they are connected in a row, and this parallel
circuit is connected in parallel to the wave receiving element 13. The Li ? ? wave transmitting
power source 12 receives the diode 14.15 and the wave receiving power. 3 in that it is connected
in series to the parallel circuit with the element 13, and when transmitting an ultrasonic wave
which has a power ratio of 1 (one end f 16.17 to several tens of Holt alternating type The
frequency of the alternating heavy weight that adds [King to ? ? ? ? lOI like trans-te ? ? ?
? sa-l] is fr 11-current characteristics of solitary system 2-de 14.15 where fr is in Fig. 2 (и ? in
Fig. 4). In other words, it shows resistance or extremely incongruent I at 11 volts or 7 volts, and
when I indicate 07 Holt, it is possible to have resistance I straight or negligible, F \ at 1 ?,
terminal 16. When the city 1 king of 17 to dozens of volts is applied, the diode The resistance
value of 4.15 becomes small enough to neglect, and since the impedance of the wave receiving
element 13 is much larger than the impedance of the wave transmitting element 12, most of the
current is the wave transmitting element 12, the diode When it is made to flow through 14.15
(5), the transmission element 12 which is mostly consumed in the transmission element 12 is
designed to maximize the transmission sensitivity at the frequency or lr. While the transmission
of ultrasonic waves is efficiently performed by the transmission element r12, almost no current
flows in the wave receiving element 13 during the transmission, and the transmission sensitivity
(i is almost operated by the lowest sensitivity. 1J) Each time the voltage f applied to one terminal
16 ░ 17 is made to be zero, each time it is fixed, the ultrasonic wave is reflected in the ultrasonic
wave or the transformer 1 is splashed.
The frequency of this reflected wave is naturally fr, and since the wave receiving element 13
receives 1 ? degree or the maximum of the frequency fr, the reflected wave is received by the
wave receiving element 13 at its maximum sensitivity. 1) 2 yc converted, this EE ? is about 0.1
volt or less, so the diode 14 ░ 15 in parallel with the receiving element 13 shows a very scary
resistance value to this voltage, In the receiving type 1 generated by the element 13, the current
hardly flows to the diode 14.15. The receiving type [t-obtained by the receiving element 13 [t-is
relatively low 0 transmission element 12 is passed through (6) j to be connected to terminal
16.17. Since the wave transmitting element 12 is the lowest of the wave receiving fathers, and
the series 14 ░ 15 of the diodes are in series, the wave transmitting element 12 hardly acts on
the wave receiving-as described above, this invention is a two element type transte In UESA, an
ultrasonic transmitting element and an ultrasonic receiving element are connected in series
between two input / output terminals, and a parallel circuit of two diodes connected in parallel
with different poles and r Is connected in parallel to the ultrasonic wave receiving element, so
when sending ultrasonic waves, the resistance f of the resistor is ignored by being applied to the
transformer or an alternating voltage of several tens of volts from the input / output terminal.
Therefore, the ultrasonic wave receiving element becomes a cedar almost short circuited by the
parallel circuit of the diode, and the gold wave is added to the ultrasonic wave transmitting
element, and the ultrasonic wave transmission is maximized. Can be done with When the wave of
the transmitted ultrasonic wave is received by the ultrasonic wave receiving element and
converted into a voltage signal by the wave receiving element -r, the middle value of the
electronic signal is received. The parallel circuit of Guai [7]] has a very high resistance value
because it is about 0.1 volt or so, and therefore the received NIf emitted from the receiving
element is a parallel diode of 1? Without being influenced by the existence of the 11th path, the
low in vivosis transmitter heart will be entrusted to the input / output terminal, thus transmitting
and 9 waves by the two input / output terminals To use the wiring for the 1 acoustic wave
transducer as it is, which has one vibration element for both transmission and reception if it can
carry r-full wiring in between. I can do that,
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description, jps50114279
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