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JPS59178096

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DESCRIPTION JPS59178096
[0001]
The present invention relates to an ultrasonic probe which is used for nondestructive inspection
and medical diagnosis. For example, as shown in FIG. 1, a conventional ultrasonic probe of this
type uses one ultrasonic transducer (1). A cutting member (3) is provided on one acoustic
radiation surface (2) of the ultrasonic transducer (1), and an acoustic impedance transformation
layer (4) is provided on the other acoustic radiation surface (2). (-T (5) is a lead wire. In
nondestructive inspection and medical diagnosis, the acoustic transmission characteristics of the
subject may have frequency dependency. When testing a subject with such characteristics,
measure the frequency characteristics of the transmitted ultrasonic pulse in advance, analyze the
frequency characteristics of the received pulse from within the subject, and compare the
difference between the two frequency characteristics And the like are detected to obtain
information inside the subject. Therefore, if the frequency characteristics of the transmission
ultrasonic pulse can be controlled, the amount of information further increases. Well, the
frequency characteristics of the above transmission ultrasound pulse. It is determined by the
combination of the ultrasonic probe and the electric circuit that excites it. But 9 usually the above
electrical circuit. An output impedance of 50 Ω is used, and the excitation waveform of the
ultrasonic probe is an extremely narrow pulse which can be regarded as an impulse. Therefore,
in order to change the frequency characteristic of the transmitted ultrasonic pulse, it is necessary
to change the constant of the ultrasonic probe. However, since the conventional ultrasonic probe
of this type is composed of only one ultrasonic transducer (1), backing material (3) and acoustic
impedance transformation layer (4) as described above, The degree of freedom of the constant
that can be controlled is small, and this has the disadvantage that it may be difficult to achieve
the required frequency characteristics. The present invention solves the above-mentioned
drawbacks by laminating a plurality of ultrasonic transducers (1) having different acoustic
radiation areas with a delay material (6) interposed therebetween, and the second and the
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following This will be described in detail using one embodiment shown in the figure. FIG. 2
shows an embodiment of the ultrasonic probe according to the present invention, in which a
plurality of ultrasonic transducers (1) having different acoustic emission areas are connected to a
delay member (6). It is composed of layers. (7) is an ultrasonic wave transmission medium. (5) is
a lead wire, as shown in FIG. The ultrasonic transducers (1) are connected so as to be excited
simultaneously. Now, when the ultrasonic probe shown in FIG. 2 is subjected to impulse
excitation by the same electric circuit as in the prior art, an ultrasonic pulse with a large
amplitude level is excited in the ultrasonic transducer (1) having a large acoustic radiation area,
In an ultrasonic transducer (1) having a small acoustic emission area, an ultrasonic pulse having
a small amplitude level is excited.
Furthermore, the time for the ultrasonic wave excited by each ultrasonic transducer (1) to reach
the surface of the test material is delayed for the ultrasonic transducer (1) located closer to the
backing material (3). Therefore, in the ultrasonic probe shown in FIG. 2, the ultrasonic pulse
transmitted to the test material is the ultrasonic pulse excited by each ultrasonic transducer (1),
the above-mentioned amplitude level and time delay And the waveform is as shown in FIG. 3, for
example. The Fourier transform of the waveform shown in FIG. 3 is a frequency characteristic,
and the waveform of FIG. 3 can be controlled by changing the acoustic radiation area of each
ultrasonic transducer (1). Therefore, in the ultrasonic probe according to the present invention,
the degree of freedom of the constant capable of controlling the nine frequency characteristics is
thicker than before (there is an advantage that the required frequency characteristics can be
realized more easily than before). The above has described the case of transmitting ultrasonic
waves, but the same applies to the case of receiving ultrasonic waves of nine or more. In addition,
although 9 or more demonstrated the case of one Example shown in FIG. 2, this invention is not
limited to this, Not only the acoustic radiation area of each ultrasonic transducer (1) but each
ultrasonic transducer ( It will be apparent that if the thickness of the delay material (6) between
1) is also controlled together, an ultrasonic probe that can meet more various requirements can
be configured. In addition, the present invention is applied to an oblique ultrasonic probe that
transmits and receives ultrasonic waves obliquely to the surface of a test material, and a surface
waveform ultrasonic probe that transmits and receives ultrasonic waves along the surface of a
test material. You may In addition, the present invention may be applied to each element of the
array type ultrasound probe. As described above, in the ultrasonic probe according to the present
invention, a plurality of ultrasonic transducers (1) having different acoustic emission areas are
laminated with the delay material (6) interposed therebetween. Compared to the prior art, there
is an advantage that the frequency characteristics of the ultrasound probe can be controlled with
a greater degree of freedom. 44, Brief Description of the Drawings FIG. 1 is a view showing a
conventional ultrasonic probe, the second echo radiation surface, (3) a backing material, (4) an
acoustic impedance transformation layer, (5) a lead Line (6) is a delay material, and (7) is an
ultrasonic wave transmission medium. In FIG. 1, the same or corresponding parts are indicated
by the same reference numerals. Figure 1 Figure 2 Figure 3
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