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DESCRIPTION JPS5683194

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DESCRIPTION JPS5683194
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of the transducer 114 of the
probe, FIG. 2 is an external view showing the structure of a general probe, and FIG. 3 is a
conventional probe FIG. 4, FIG. 4, FIG. 5, and FIG. 6 are sectional drawings which show one
Example of the probe based on this invention. 1
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии First matching layer, 4
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Second matching layer , 5... Acoustic lens, 3a, 3b, 4a. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention is an ultrasonic probe (1)
for use in an ultrasonic diagnostic apparatus. It relates to a tentacle. FIG. 1 shows the appearance
of the transducer play portion of an ultrasonic probe (hereinafter simply referred to as a probe),
and 1 in FIG. 1 is an ultrasonic vibration microelement (hereinafter simply referred to as a
vibration microelement) It is one of the small pieces which cut the member of the plate-like
ultrasonic transducer in the shape of an array finely. The ultrasonic transducer is made of, for
example, a PZT (lead zirconate titanate) -based material. Reference numeral 2 denotes a packing
material, which has an effect of absorbing an ultrasonic beam directed to the back of the
transducer array. What is shown in FIG. 1 is one in which the above-described large plate-like
ultrasonic transducer member is bonded to the backing material 2 and then cut into the
respective vibration microelements 1. FIG. 2 is an external view showing the structure of a
general probe. That is, the matching layer and the acoustic lens are disposed on the front surface
(the side B shown in FIG. 2) of FIG. In FIG. 2, 1 is a vibrating fine element, and 2 is a backing
material, which are the same as those in FIG. A first matching layer 5 is provided on the front
surface of the array of the vibration microelements 1, and is made of, for example, a rigid body
such as a crow. A second alignment (2) gold layer 4 is made of, for example, a polymer film, and
is provided on the front surface of the first alignment layer 3 described above. The first matching
layer 5 and the second matching layer 4 perform acoustic impedance matching between an
object (not shown) to which an ultrasonic beam is transmitted and the play of the vibration fine
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element, and from the probe It has the effect of directing the transmission efficiency of the
transmitted ultrasonic wave and obtaining an ultrasonic beam with good damping, which is
called a first matching layer 3if1 / 4? layer. Assuming that the acoustic impedance of the
vibration microelement is zp, the acoustic impedance of the object is Zw, the acoustic impedance
of the first matching layer 5 is 21 and the acoustic impedance of the second matching layer 4 is
zl, zl and 22 are generally The value is selected to satisfy the equation (1) shown in the equation
(2). z1 = Jzp-zl (S Z2 = JZ Ding) Skin (2) Assuming that the subject is a human body, a crow or the
like as the first matching layer 6 as a material satisfying the expressions (+) and (2) As the
second matching layer 4, a polymer film or the like is used. An acoustic lens 5 improves the
focusing (directivity) of the ultrasonic beam emitted from the array of the vibrational fine
elements 1 (5) and also has an effect as a matching layer 1, this acoustic lens 5 Is provided on
the front surface of the second matching layer 4. In such a general probe, FIG. 5 shows a crosssectional view of a conventional probe when it is cut along plane A shown in FIG.
The elements numbered 1 to 50 in FIG. 5 are the same as the elements described in FIG. As
apparent from FIG. 3, the structure of the conventional probe is that the first matching layer 3
and the second matching layer 4 are simply attached to the front surface of the array of the
vibrating microelements 1 Adjacent vibrational microelements 1 are acoustically coupled
through the matching layer to cause a quark to cause deterioration of the directivity of the
transmitted ultrasonic beam and also to the waveform (dapping) of the transmitted ultrasonic
beam Adversely affect. In particular, the first matching layer 5 is made of a rigid body such as a
crow, and the mutual interference between the ultrasonic beams becomes large through the first
matching layer. Therefore, it becomes the cause of the blurring of the image obtained by the
ultrasonic diagnostic apparatus (4). FIG. 4 is a view showing one embodiment of the probe
according to the present invention, and is a cross-sectional view corresponding to the case of
cutting on the A surface shown in FIG. The configuration of the probe of FIG. 4 is very similar to
that shown in FIGS. 2 and 5 except that the first matching layer is cut away. That is, in the case of
the present invention shown in the fourth section, the first matching layer is cut corresponding
to the vibrating element 1. In FIG. 4, reference numeral 3a denotes a cutting portion for cutting
the first matching layer corresponding to each vibration microelement 1, and reference numeral
31 denotes the first matching layer described above, which corresponds to the first matching
layer 6 in FIG. The other components are the same as those in FIG. 5 in the sixth embodiment
41A in which the material and the like are completely the same, and therefore, the description
thereof will be omitted. Thus, in FIG. 4, since the first matching layer 31 is cut at the cutting
portion 3a so as to correspond to each vibration microelement 1, the matching layer 31 of each
building 1 is acoustically isolated and each vibration is generated. The ultrasonic beams emitted
from the microelement 1 are emitted to the front surface (B in FIG. 2) without interfering with
each other, and the directivity is not impaired. (5) In the probe of FIG. 4, although it has been
described that the first matching layer is cut to correspond to one vibrator element, the first
matching layer is to be corresponded to a plurality of vibration microelements. The matching
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layer may be cut. For example, as shown in FIG. 5, the first matching layer 32 may be cut at the
cutting portion 3b so as to correspond to five vibration microelements. The first matching layer
32 corresponds to the first matching layer 3 in FIG. S, and the material and the like are also the
same. The probe shown in FIG. 5 electrically connects five vibration microelements in parallel or
is acoustically insulated) and simultaneously drives five vibration microelements. From the probe
of FIG. 5, a directional ultrasonic beam can be obtained.
4 and 5 show an example in which only the first matching layer is cut out of the matching layers,
but as shown in FIG. 6, the second Q ') matching layer corresponds to the first matching layer. It
may cut | disconnect in the cutting part 4a so that. Thus, according to the present invention, (6)
each ultrasonic beam emitted from the probe by cutting the matching layer disposed on the front
surface so as to correspond to the one or more vibration fine elements Can be obtained without
interfering with each other, hence with a sharp directivity and without impairing the waveform
(damping) of the ultrasonic wave, and the effect is extremely large.
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