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DESCRIPTION JPS6190647

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DESCRIPTION JPS6190647
[0001]
FIELD OF THE INVENTION The present invention relates to an ultrasonic probe used in an
ultrasonic diagnostic apparatus for inspecting the inside of a living body. Configuration of the
Conventional Example and Problems Thereof Conventionally, when the inside of a living body is
displayed in real time, when viewing the deep part of the living body, a relatively low resonance
frequency of 2 to 3.5 MHz with a relatively deep arrival depth of ultrasonic waves is exceeded.
When using a sound wave probe and looking at the shallow part of the living body, it is used
properly, such as using an ultrasonic wave probe with a relatively high resonance frequency of 5
M, Hz or more. At high resonance frequency, the shallow part of the living body can be viewed
accurately but the deep part can not be viewed. The low resonance frequency can be seen to the
deep part of the living body, but there is a problem that the precision of the shallow part is
inferior and the deep part can not be seen simultaneously while looking at the shallow part of the
raw fish precisely. Therefore, it is necessary to look while exchanging both, and it has the
problem that usability is very bad. A conventional ultrasonic probe will be described with
reference to FIG. A piezoelectric vibrator 1 has a thickness {circle over (1)} determined in
accordance with the resonance frequency. An acoustic matching layer 2 is adhered to the surface
of the piezoelectric vibrator 1 by an adhesive or the like, and a convex lens 3 for focusing a beam
of ultrasonic waves is adhered to the surface of the acoustic matching layer 2 by an adhesive. . In
the ultrasonic probe having such a configuration, the frequency band of sensitivity is determined
by the thickness of the piezoelectric vibrator 1, and it is possible to satisfy the purpose of
simultaneously observing the shallow portion of the living body with a high precision while
simultaneously observing the shallow portion. Can not. That is, the convex lens 3 is generally
made of silicon rubber or the like, and the ultrasonic wave generated by the piezoelectric vibrator
1 absorbs a large amount of energy when passing through the convex lens 3. This energy
absorption increases substantially in proportion to the frequency as the frequency of the
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ultrasonic wave increases. Therefore, among the ultrasonic waves generated from this ultrasonic
probe, the relatively high frequency ultrasonic waves are relatively strongly attenuated, and it is
difficult to see the deep part of the living body using the high frequency ultrasonic waves.
Become. The material of the convex lens 3 is approximately equal to the acoustic impedance of
the living body (density × sound speed), and the speed of sound 1 in the living body! It is
required to have characteristics such as as small as possible as compared with 10010 '/ S, high
hardness and excellent wear resistance, and small attenuation of ultrasonic waves. The speed of
sound must be small because when the focal length of the convex lens 3 is set to a certain value,
the θ of the convex lens 3 can be made smaller as the speed of sound of the convex lens 3 is
smaller than the speed of sound of the living body. This is because it is possible to reduce the
attenuation of ultrasonic waves.
However, the material of the convex lens 3 which satisfies the condition described above is easily
1! 7られない。 SUMMARY OF THE INVENTION The object of the present invention is to solve
the above-mentioned conventional drawbacks, and it is an object of the present invention to
provide an ultrasonic probe which allows the shallow portion of the living body to be seen clearly
and the deep portion. SUMMARY OF THE INVENTION In order to achieve the above object,
according to the ultrasonic probe of the present invention, the thickness of the longitudinal
central portion is larger than that of both ends and one surface is flat and polarized in the
thickness direction and one surface A plurality of piezoelectric vibrators arranged in a row
parallel to each other at appropriate intervals in the short side direction, an acoustic matching
layer whose one surface is fixed to one surface of these piezoelectric vibrators, and one surface is
flat and the other surface is an arc And a convex lens of which one surface is fixed to the other
surface of the acoustic matching layer. Description of Embodiments Hereinafter, an embodiment
of the present invention will be described based on the drawings. FIG. 1 is a perspective view of
an M3 acoustic wave probe according to an embodiment of the present invention. The same
components as the components shown in FIG. In FIG. 1, 4 is a plurality of piezoelectric vibrators,
and each piezoelectric vibrator 4 is flat on one side and small in thickness at both ends, Are
arranged in a row parallel to the. One surface of the acoustic matching layer 2 is bonded and
fixed to the one surface of the plurality of piezoelectric vibrators 4. On the other surface of the
acoustic matching layer 2, the flat other surface of the convex lens 3 of which one surface is an
arc surface is in contact with and fixed 11. As shown in FIG. 2, each of the piezoelectric vibrators
4 has electrodes 5a and 5b on one side and a narrow side to the right, and polarization
processing is performed in a direction perpendicular to one side of the piezoelectric vibrator 4.
Further, lead wires 6a and 6b are attached to the electrodes 5a and 5b in order to apply a high
frequency signal. In the ultrasonic probe, since the thickness dimension of the piezoelectric
vibrator 4 is large at the central portion in the longitudinal direction and small at both ends, the
resonance frequency is distributed in a wide range, and a wide frequency band can be obtained.
In addition, the resonance frequency of the piezoelectric vibrator 4 is higher at both ends, and
relatively high frequency ultrasonic waves are generated. However, since the thickness of the
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convex lens 3 is thinner at both ends, the ultrasonic waves pass through the convex lens 3 The
energy absorption in the case is small, and it is possible to transmit and receive relatively high
frequency ultrasonic waves efficiently. On the other hand, since the energy absorption in the case
of transmitting the convex lens 3 is relatively low, the relatively low same wave ultrasonic wave
has a similar strength to the conventional one even though it is transmitted through the thick
part of the convex lens 3 in the central part. Since ultrasonic waves can be transmitted and
received, and an ultrasonic probe with a wide frequency band can be obtained, it is possible to
see the shallow part of the living body with high precision and to look at the deep part with one
ultrasonic probe. It becomes.
The shape of the piezoelectric vibrator 4 may be, as shown in FIG. Moreover, in the said Example,
although the acoustic matching layer 2 demonstrated 1 layer example, you may provide the
acoustic matching layer 2 two layers or three or more layers. In addition, an ultrasonic absorber
may be provided on the other surface of the piezoelectric vibrator 4. As described in detail in the
invention, according to the present invention, it is possible to see the shallow part of the living
body with high accuracy and to see the deep part of the living body while using the same
material as the conventional one as the convex lens. it can.
[0002]
Brief description of the drawings
[0003]
1 is a perspective view of an ultrasonic probe according to an embodiment of the present
invention, FIG. 2 is a front view of a piezoelectric transducer of the ultrasonic probe, and FIGS. 3A
and 3B are other embodiments. FIG. 4 is a front view of the piezoelectric transducer of the
ultrasonic probe in FIG.
2 ... acoustic matching layer, 3 ... convex lens, 4 ... piezoelectric vibrator agent Yoshihiro
Morimoto Fig. 1 Fig. 2 Fig. 4
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