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DESCRIPTION JPS6190646

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DESCRIPTION JPS6190646
[0001]
TECHNICAL FIELD The present invention relates to an ultrasonic probe used for m-sound
examination PJi K examination for examining the inside of a living body. Configuration of
Conventional Example and Problems Thereof Conventionally, in the case of viewing the inside of
a living body in real time, when viewing the inside of a living body, when looking at the deep part
of the living body, the depth of the ultrasonic wave is deep 2-3.5M +-(Z When using a low
resonance frequency ultrasonic probe and looking at the shallow part of the living body, use a
relatively high Jt vibrational frequency ultrasonic probe of -5M) 17 or more. There is. At high
resonance frequency, the shallow part of the living body can be viewed accurately but the deep
part can not be viewed. Although low resonance frequencies can be seen in deep parts of the
living body, they have the problem that the precision of the shallow part is inferior, and deep
parts can not be seen simultaneously while looking at the shallow part of the living body with
high precision, There is a problem that it is necessary to look while exchanging both, and the
usability is extremely bad. Such a conventional ultrasonic probe will be described with reference
to FIG. Reference numeral 1 denotes a piezoelectric vibrator that makes the thickness t
determined in accordance with the resonance frequency right. An acoustic matching layer 2 is
adhesively fixed 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 adhesively fixed to the surface of the
acoustic matching M2. 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 viewing the deep part while simultaneously viewing the
shallow part of the living body with accuracy. 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
(density x sound speed) of the living body, is as small as possible as compared to the speed of
sound 1500 m / s in the living body, high hardness and excellent wear resistance, Characteristics
such as low sound wave attenuation are required. The speed of sound must be small because if
the focal length of the convex lens 3 is blue, the thickness 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 the attenuation of the MA sound wave can be reduced.
However, the material of the convex lens 3 which satisfies the above conditions can not be easily
obtained. 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 capable of
accurately observing a shallow portion of a living body (and looking at a deep portion of the
living body). . 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 the both ends and one surface is flat and polarized in the thickness direction
and one short side A plurality of piezoelectric vibrators arranged in a row parallel to each other
at appropriate intervals in the direction, an acoustic matching layer whose one surface is fixed to
one surface of these piezoelectric vibrators, and a cross-sectional shape obtained by cutting an
ellipse parallel to a long sleeve And a convex lens whose flat 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
ultrasonic 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 has a flat − surface and a reduced thickness at both end portions, and
the piezoelectric substrate 4 is spaced at appropriate intervals in the short side direction of the
− surface. They are arranged parallel to one another in a row. One face of the acoustic matching
layer 2 is adhesively fixed to the negative faces of the plurality of piezoelectric vibrators 4. On
the other surface of the acoustic matching layer 2, a flat surface of a convex lens 5 having a
cross-sectional shape obtained by cutting an ellipse in parallel with the long axis is adhesively
fixed. Each of the piezoelectric vibrators 4 has, as shown in FIG. 2, electrodes 5a and (3b) on theface and the other face, and polarization processing is performed in a direction perpendicular to
one face of the pressure 11 vibrator 4! iされている。 Further, leads tlA 7a and 7b are attached
to the electrodes 6a and 6b in order to apply a high frequency signal. Since the thickness
dimension of the piezoelectric vibrator 4 is large at the central portion in the longitudinal
direction and small at both end portions, the resonant frequency is distributed in a wide range,
and the frequency band can be broadened. Further, the resonance frequency of the piezoelectric
vibrator 4 becomes higher toward the both ends, and relatively high frequency ultrasonic waves
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are generated. However, since the thickness of the convex lens 5 is thin as the both ends, the
ultrasonic waves are convex lens 5 The energy absorption in the case of passing through is small,
and it is possible to transmit and receive relatively high frequency ultrasonic waves efficiently.
On the other hand, since relatively low frequency ultrasonic waves have little energy absorption
when transmitting through the convex lens 5, even if they transmit through the thick part of the
convex lens 5 at the central portion, the same strength as the conventional one is obtained.
Ultrasonic waves can be transmitted and received, and an ultrasonic probe with a wide frequency
band can be obtained.
Further, since the curvature of the convex lens 5 becomes smaller toward both ends, the
relatively high frequency ultrasonic waves generated from the both ends of the piezoelectric
vibrator 4 are focused to a short distance as shown in FIG. Since the relatively low frequency
ultrasonic waves generated in the central part are focused on the long path 111 ft B, the shallow
part of the living body is more accurate than the both ends of the piezoelectric vibrator 4, and
the deep part of the living body is the piezoelectric vibrator 4. The shape of the piezoelectric
vibrator 4 is, as shown in FIGS. 4A and 4B, a cross section as shown in FIGS. 4A and 4B. It may
have a substantially triangular shape or a substantially arc-shaped cross section. Further, in the
above embodiment, the example in which the acoustic matching layer 2 is one layer is described,
but the @ echo matching layer 2 may be provided with 2F1 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 while looking at the deep part of the living
body while using the same material as the conventional one as the convex lens. be able to.
[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 FIG. 3 is
an operation explanatory view of a convex lens. FIGS. 4A and 4B are front views of the
piezoelectric transducer of the ultrasonic probe in another embodiment, and FIG. 5 is a front view
of the conventional ultrasonic probe.
2 ... acoustic matching layer, 4 ... piezoelectric vibrator, 5 ... convex lens
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