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JPH0570099

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DESCRIPTION JPH0570099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention oscillates a
pulsed ultrasonic wave, receives a reflected wave of the ultrasonic wave, and detects the distance
and time to an object without contact. The present invention relates to an ultrasonic transmitterreceiver adapted to reduce reverberation near the transmission.
[0002]
2. Description of the Related Art As shown in FIG. 6, two terminal boards are integrally mounted
on the bottom of a case 1 as an ultrasonic transmitter-receiver of this type, and a cylindrical body
3 is integrally formed on the terminal boards 2. It has been proposed that the piezoelectric
structure 4 is formed on the cylindrical body 3 and bonded with the elastic adhesive 5, and the
conical resonator 6 is attached to the coupling axis of the piezoelectric structure 4.
[0003]
The piezoelectric structure 4 has a structure in which two piezoelectric elements are bonded
together or a metal plate is bonded to one piezoelectric element, and is fixed to the terminals of
the piezoelectric structure 4 and the terminal plate 2. Leads 9 and 10 are connected to the
terminals 7 and 8, respectively.
[0004]
In the ultrasonic transmitter-receiver 11 configured as described above, when the electric pulse
signal shown in FIG. 7A is applied to the piezoelectric structure, ultrasonic waves are transmitted
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from the ultrasonic transmitter-receiver 11 as shown in FIG. 7B. However, this ultrasonic wave
generates a long reverberation T1 in the vicinity of the transmission.
[0005]
Therefore, as shown in FIG. 7 (b), since a long reverberation signal T1 is generated in the vicinity
of the transmission of the ultrasonic wave generated from the ultrasonic wave transmitterreceiver 11, this reverberation signal is generated. There is a problem that the reflected wave
from the detected part can not be detected in the part where T1 is generated, that is, in the
vicinity of the transmission.
[0006]
SUMMARY OF THE INVENTION A composite resonator is provided by attaching a conical
resonator to a connecting shaft of a piezoelectric structure in which two piezoelectric elements
are bonded or in which a piezoelectric element and a metal plate are bonded. Ultrasonic wave
transmission and reception in which the piezoelectric structure is elastically bonded to the
cylindrical body of the terminal plate provided at the bottom of the case, and the terminal fixed
to the terminal plate and the piezoelectric element structure are electrically connected by lead
wires In the container, a through hole with the same diameter as the cylindrical body is provided
in the inner portion of the cylindrical body of the terminal plate.
[0007]
In the present invention, by providing one or more through holes on the inner side or outer side
or both sides of the cylindrical body of the terminal plate, the ultrasonic waves generated from
the piezoelectric element reduce the echo between the terminal plates. Therefore, the time for
reverberation to occur is shortened.
[0008]
As a result, the undetectable portion of the detection subject in the vicinity of the transmission is
reduced, and detection of the detection subject can be performed even in the vicinity of the
transmission.
[0009]
1 is a sectional view of an ultrasonic transmitter-receiver according to an embodiment of the
present invention, wherein 1 is a case, 2 is a terminal plate, 3 is a cylindrical body, 4 is a
piezoelectric structure, and 5 is elastic. The adhesive 6 is a conical resonator, 7 and 8 are
terminals, and 9 and 10 are lead wires. The configuration of these components is the same as
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that of the above-described conventional example, and therefore the description thereof is
omitted.
[0010]
In the present embodiment, a through hole 12 having the same diameter as the inner diameter of
the cylindrical body 3 is formed in the terminal plate 2 inside the cylindrical body 3.
[0011]
In the embodiment configured as described above, when the electric signal shown in FIG. 2A is
applied to the piezoelectric structure, as shown in FIG. 2B, the ultrasonic wave generated from
the piezoelectric structure 4 is generated. The reverberation time T2 is short because the
through holes 12 of the terminal board 2 do not resonate between the terminal boards 2
[0012]
In the ultrasonic transmitter-receiver 11 of the conventional example, as shown in FIG. 2C, a
longer reverberation signal T3 is generated at a low temperature, but as shown in FIG. In the
ultrasonic transmitter-receiver 13, the reverberation signal T4 is as short as the ultrasonic wave
generated at the normal temperature (20 degrees Celsius) shown in FIG. 2 (b).
[0013]
In the description of the above embodiment, an example in which the through hole 12 of the
inner diameter of the cylindrical body 3 is provided in the terminal plate 2 is shown, but as
shown in FIG. Even if provided
[0014]
Also, as shown in FIG. 4, a plurality of small diameter through holes 15 are shown inside the
cylindrical body 3 of the terminal plate 2 (five examples are shown in FIG. 4, but the number is
not limited to five. ) May be provided.
[0015]
Furthermore, as shown in FIG. 5, a large number of through holes 16 may be provided in the
terminal plate 2 on the outer side of the cylindrical body 3. In this example, one or a plurality of
through holes 16 are formed on the inner side of the cylindrical body 3. Even if you make a hole
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[0016]
In the ultrasonic transmitter / receiver 13 of this embodiment configured as described above,
since a short ultrasonic wave of the reverberation signal T2 can be generated, reception near the
transmission can be performed.
[0017]
As described above, in the ultrasonic transmitter-receiver according to the present invention, by
providing one or a plurality of through holes on the inner side or the outer side of the cylindrical
body of the terminal plate, or both of them, piezoelectricity can be obtained. Since the ultrasonic
waves generated from the elements do not resonate between the terminal boards, the
reverberation signal becomes short, so that there is an advantage that reception near the
transmission can be performed.
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