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JPS6012899

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DESCRIPTION JPS6012899
[0001]
The present invention relates to an ultrasonic probe used for an ultrasonic flaw detector or an
ultrasonic diagnostic apparatus. As shown in FIG. 1, the general structure of the ultrasonic probe
is the piezoelectric vibrator 1, the matching layer 3 for the human body 2 provided on the front
surface thereof, the focusing lens 4 and the piezoelectric vibrator The ultrasonic wave emitted
from the piezoelectric vibrator 1 is mostly formed as shown by the arrow 6 through the focusing
lens 4 as shown in FIG. Is radiated into the human body 2 and the remaining portion is K
absorbed by the back load body 5 as shown by the arrow 7. In FIG. 1, reference numeral 8
denotes an adhesive layer between the piezoelectric vibrator 1 and the back load body 5. By the
way, as the rear load body 5, id (1) the ultrasonic wave is well absorbed, and the reflected
ultrasonic wave at the end face does not return to the piezoelectric vibrator 1, (2) wide frequency
bandwidth of the piezoelectric vibrator 1, It is necessary to satisfy the conditions such as
improving responsiveness, (3) absorbing unnecessary vibration, and (4) strengthening
mechanical strength of the probe. Therefore, conventionally, ferrite rubber, tungsten epoxy and
the like are formed in advance, and bonded to the piezoelectric vibrator 1 with an adhesive, or an
epoxy resin or the like is poured into the back of the piezoelectric vibrator and cured to obtain a
back load body. It was However, from η, in the case of the back load body 5 as in the former
case, the bonding state with the piezoelectric vibrator varies in the adhesive layer, and the
characteristics of the piezoelectric vibrator become uneven, and the back load body 5 as in the
latter case In such a case, the reflection end face at the time of curing tends to be flat, and the
reflected wave is easily returned to the piezoelectric vibrator, and it is difficult to perform an
appropriate ultrasonic probe in any case of il which is a cause of generating a pseudo signal. On
the other hand, it has been proposed to form an acoustic scattering layer of a minute substance
inside as a back load body which eliminates the variation of the characteristics due to the
presence of the adhesive layer and eliminates the generation of the pseudo signal due to the
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reflected wave. However, such a rear load body forms the acoustic scattering layer in layers
because the material of the acoustic scattering layer is concentrated at one end by the
precipitation phenomenon if it is formed by pouring to eliminate generation of the pseudo signal
due to the reflected wave. It becomes extremely difficult to do, and it becomes difficult to have
the effect of sound wave scattering. The present invention has been made in view of the
problems as described above, and it is possible to eliminate variations in characteristics and to be
easily formed by pouring, so that generation of spurious signals due to reflected waves can be
eliminated. It aims at providing an acoustic wave probe. An embodiment of the present invention
will be described below with reference to the drawings.
FIG. 2 is a structural sectional view showing an embodiment of the present invention, which is
formed on the piezoelectric vibrator 1, the matching layer 3 to the human body 2 provided on
the front surface, and the matching layer 3. A focusing lens 4, a back load body 5 provided on
the side of the piezoelectric vibrator 1 facing the matching layer 3, and a sound wave scatterer 9
fixed on the side of the back load body 5 facing the piezoelectric vibrator 1 It is composed of In
the present embodiment, tungsten epoxy resin or silicon rubber conventionally used is used as
the material of the back load body 5, and these materials are poured into a casting mold disposed
on the back surface of the piezoelectric vibrator 1, The acoustic scatterer 9 is suppressed before
being cured and cured as it is to fix the back load body 6 VC acoustic scatterer 9. The acoustic
scatterer 9 has a wavelength of ultrasonic waves of about 0.1 to Q, 5 M in the back load 5, so
that it has the same or larger thickness to scatter or diffusely reflect it. The surface has an
unevenness of about 0.5 to 1% of the ground σ. As the sound wave scatterer 9 having such
unevenness, a material made of a material different from the back load body 5 such as a sponge
body or a foamed polystyrene is suitable. In the ultrasonic probe of the present embodiment
having such a configuration, the ultrasonic wave emitted from the piezoelectric vibrator 1 is
mostly emitted toward the inside of the human body 2 as indicated by the arrow 6, while the
arrow 7 The remaining part shown by is passed through the inside of the back load body 5 and
scattered by the sound wave scatterer 9 as shown by the arrow 1 o VC, and is less likely to be
absorbed in the back load body 5 and returned to the piezoelectric vibrator 1. Therefore, the
pseudo signal due to the reflected wave can be eliminated. Also, since the sound wave scatterer 9
is made of a material different from that of the back load body 6 and is fixed to the end of the
back load body 6, even if the back load body 6 is formed by pouring, In addition, the formation of
the back load body 6 can be performed extremely easily without causing any trouble such as a
wrinkle to the formation of the sound wave scatterer 9. Furthermore, since it can be formed by
pouring, the dispersion ¦ variation in the characteristic by the presence of an adhesive layer can
be eliminated. FIG. 3 is a structural cross-sectional view showing another embodiment of the
present invention, and in the case where the aperture diameter of the sound wave from the
simultaneously driven probe is d, a sawtooth-shaped surface having a repetition cycle smaller
than d. In the present embodiment, the reflected wave 10 from the acoustic wave scatterer 9 汀
the piezoelectric vibrator 1 side deviates from the aperture diameter d in the present
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embodiment, so as a reflected signal Is not received, and no pseudo signal is generated. As
described above, according to the present invention, since the sound wave scatterer made of a
material different from that of the back load body is provided on the side opposite to the
piezoelectric vibrator of the back load body, the piezoelectric vibrator to the back load body side
The emitted σ is scattered or irregularly reflected by the acoustic scatterer, and it is less likely to
return as a pseudo signal to the piezoelectric imaging actuator, and the back load can be formed
by pouring, so the back load and An adhesive layer is not interposed between the piezoelectric
vibrator and the piezoelectric vibrator, and variations in the characteristics due to the adhesive
layer can be eliminated.
Furthermore, since the sound wave scatterer is made of a different material from the back load
body and adheres to the end of the back load body, even if the back load body is formed by
pouring, it is The back load body can be extremely easily formed without any trouble in the
formation.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the structure of the conventional ultrasonic probe, FIG. 2
is a cross-sectional view showing the structure of the ultrasonic probe in one embodiment of the
present invention, and FIG. It is a sectional view showing an example.
DESCRIPTION OF SYMBOLS 1 ......... Piezoelectric vibrator, 3 ... Matching layer, 4 ......... Focusing
lens, 5 ... Back load body, 9 ......... Sound wave scatterer. Name of Agent Attorney Nakao Toshio
Other 1 person Figure 1 Figure 2 Figure 3 Figure 07 /
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