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DESCRIPTION JPS59218097

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DESCRIPTION JPS59218097
[0001]
(A) Industrial Application Field The present invention relates to an ultrasonic diagnostic
apparatus that transmits ultrasonic waves to a subject and obtains information on an affected
part or organ inside the subject by the reflected waves inside the subject. The present invention
relates to an ultrasonic contact suitable for abuse in transmission and reception of sound waves.
(B) Prior Art As shown in FIG. 1, the conventional ultrasonic contactor has a flat alignment which
improves the ultrasonic wave permeability on the surface of the object side of the piezoelectric
vibrator (a) having the piezoelectric effect. There is a type in which a layer (b) and (C) are
provided, and on the other surface of the piezoelectric vibrator (a), a backing layer (d) formed by
mixing metal powder or the like in silicon rubber is provided. Then, the Q of the piezoelectric
vibrator (a) is appropriately damped by the backing layer (d) to absorb an unnecessary waveform
and to absorb an ultrasonic wave coming from the opposite direction. By the way, since the
conventional backing layer (d) is made of a rubber-based resin mixed with metal powder, it does
not have sufficient hardness. Therefore, when a piezoelectric body is attached to the backing m
(d) and this piezoelectric body is separated and cut to obtain a plurality of piezoelectric vibrators
(a), Misalignment of the array adversely affects the characteristics. For this reason, as shown in
FIG. 1 (b), a hard plastic resin layer (e) having a constant thickness over the entire width was
provided between the backing layer (d) and the piezoelectric vibrator (a). Things have been
proposed. However, in the case of the ultrasonic contactor having the resin layer (e) having such
a constant thickness, there is a problem that the sensitivity sags at a specific frequency. That is,
assuming that the thickness of the resin layer (e) is EB and the velocity of sound in the resin layer
(e) is VB, as shown in FIG. 2, the frequency f? · (2 n -1) (nt B is an integer) Where the sensitivity
falls at (a or 0 in the figure), and the frequency response characteristic is high with peaks and
valleys where the frequency f is one and two n (n is an integer) and the sensitivity is higher
Become. The distortion of the frequency response degrades the attenuation of the pulse response
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waveform of the ultrasonic contact, resulting in deterioration of the distance resolution and
image quality. (C) Purpose The present invention has been made in view of the above problems,
and can obtain flat frequency response characteristics over a wide band, and thus obtain a good
diagnostic image when applied to an ultrasonic diagnostic apparatus. An object of the present
invention is to provide an ultrasonic contact that can be In order to achieve the above object, the
present invention comprises a first layer made of a synthetic resin for fixing a backing layer to a
piezoelectric vibrator and a second layer made of a rubber or the like fixed to the first layer. And
the thickness of the first layer is formed to be continuously or stepwise changed with respect to
the piezoelectric vibrator.
The present invention will be described based on the embodiments shown in FIG. 3 to FIG. FIG. 1
is a perspective view of an ultrasonic contact according to the present invention, and FIG. 4 is a
side view thereof. In these figures, (1) is an ultrasonic contactor, (2) is a plurality of divided
piezoelectric vibrators, (s), <4) is the surface of the piezoelectric vibrator (2) on the subject side.
First and second matching layers for acoustic matching fixed. A backing layer (5) is provided on
the surface of the piezoelectric vibrator (2) opposite to the matching layer (3) (4). This backing
layer (5) comprises a first layer (6) made of synthetic resin such as epoxy resin and acrylic resin,
and a second layer (7) formed by mixing silicon rubber, quartz powder and the like into this. The
first layer (6) is fixed to the piezoelectric vibrator (2), and the second layer (7) is fixed to the
seventeenth il (6) to be integrally coupled. Furthermore, the first layer (6) is formed such that its
thickness (1) changes continuously with respect to the piezoelectric vibrator (2) over the entire
width (l). That is, in FIGS. 3 and 4, the interface (8) between the first layer (6) and the second
layer is formed in an arc shape. The thickness (1) of the first layer (7) is not limited to the water
side, and may be changed continuously or in steps, for example, as shown in FIG. 5 (a) (b) (c) As
such, it may be corrugated, triangular or stepped. Thus, since the thickness (1) of the first layer
(6) is changed, as shown in FIG. 6, the frequency response characteristic of the ultrasonic
contactor (1) is flat over the wide area and causes a deviation. It disappears. As described above,
according to the present invention, the backing layer is made of the first layer made of synthetic
resin to which the piezoelectric vibrator is fixedly adhered and the dust or the like fixed to the
first layer. Since the second layer is formed and the thickness of the first layer is continuously or
stepwise changed with respect to the piezoelectric vibrator, the frequency response characteristic
of the ultrasonic contact is prevented. The sensitivity is kept uniform over a wide band.
Therefore, when applied to an ultrasonic diagnostic apparatus, an excellent effect is obtained that
a high quality image can be obtained.
[0002]
Brief description of the drawings
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[0003]
1 and 2 show a prior art example, and FIGS. 3 to 6 show an embodiment of the present invention,
and FIG. 1 is a side view of an ultrasonic contact in both (a) and (b), 2 is a response characteristic
diagram of the frequency, FIG. 8 is a perspective view of the ultrasonic contact, FIG. 4 is a side
view, FIG. 5 is a side view showing a modified example of the backing layer, and FIG. FIG.
(1) ... ultrasonic contact, (2) ... vibrator, (5) ... backing layer, (6) ... first layer, (7) ... second layer
patent application Person Shimazu Manufacturing Co., Ltd. Attorney Attorneys Okada Kazuhide 1
Fig. (A) (b) Fig. 2 → Last fL 第 Fig. 4 Fig. 4 · Fig. 5 G Corrected Document (Method) Showa 59
July 3, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd,
3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 3rd, 4th, 5th.
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