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JPS59224999

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DESCRIPTION JPS59224999
[0001]
The present invention relates to a linear array type ultrasonic probe used for ultrasonic flaw
detection, ultrasonic diagnosis and the like, in which the azimuth resolution in the direction
perpendicular to the arrangement direction of the transducers is enhanced. In the linear array
type ultrasonic probe, as shown in the plan view of FIG. 1, the strip-like transducers 1 are
arranged in the lateral direction on the acoustic impedance matching material 2 at
predetermined intervals, The IJ-r line 3.degree. 4 is drawn from the electrode on the lower
surface of the sensor, and the rear surface is molded with resin (not shown). In general, in an
ultrasonic probe, improving the azimuth resolution (the ability to identify two points aligned in
the direction perpendicular to the beam traveling direction) is considered as one problem. The
improvement of the azimuthal resolution is required to realize a narrow beam width over the
entire use depth. In the linear array type ultrasound probe, the azimuth resolution in the
longitudinal direction (the direction in which the transducers are arranged) can be enhanced by
electron focusing. That is, by delaying and driving the inner vibrator with respect to the outer
vibrator, the beams from the respective vibrators are connected to form an arc-shaped wavefront,
and the beam is converged in the vicinity of the focal point. It is possible to improve the azimuth
resolution. However, the conventional vibrator is simply formed in a flat plate shape, and the
beam is simultaneously emitted in the short direction (direction perpendicular to the
arrangement direction of the vibrator), and the beam is traveled in the depth direction It was
gradually wide and sweet, and good lateral resolution was not obtained in the latitudinal
direction. Conventionally, as a device in which the azimuthal resolution is enhanced by devising
the shape of the transducer itself, Proceedings of the Japan Ultrasonics Medical Society
Conference Collection No. 213-21 (fi fi p. 35-36 p. There is one described in the article
"Development of sound wave probe". In this method, a thin beam width can be obtained over the
entire working depth by forming a vibrator in a circular shape of a latnow and forming a virtual
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ring sound source. Therefore, if a plurality of these rat-A-shaped probes are linearly arranged to
constitute a linear array type ultrasonic probe, the lateral resolution in the lateral direction can
be improved. However, in this case, the electron convergence method and the sector scanning
method described above can not be used this time (it becomes impossible). That is, in order to
shift the convergence position of the beam from just under the transducer in both the electron
focusing method and the sector scanning method, it is necessary that the beams emitted from
each transducer have a certain degree of nondirectionality in the longitudinal direction of the
array. In the above-mentioned Lanozo-like transducer, the directivity is too strong to reach not
only the play short direction but also all directions (that is, the beam can be directed only in the
direct direction, and if it is slightly deviated from the direct direction) The sensitivity is extremely
reduced), it can not be converged at any position in the longitudinal direction, and does not
become a Tenkawa.
The present invention has been made in view of the above-mentioned point VC @, and in the
linear array type ultrasonic probe, nondirectional beam radiation characteristics are obtained in
the transducer array direction, and converged in the direction perpendicular to the transducer
array direction. It is an object of the present invention to provide an ultrasonic probe in which
the azimuth resolution in the direction perpendicular to the transducer arrangement direction is
enhanced without affecting the electron focusing method and the sector scanning method so as
to obtain characteristics. . According to the present invention, a plurality of transducers each
having a radiating surface having a side surface shape in which two arcs drawn at two points on
the same plane are crossed are arranged in the lateral direction to reverse the center of the arcs.
The ultrasonic beam is emitted from the side surface. Hereinafter, embodiments of the present
invention will be described with reference to the attached drawings. FIG. 2 shows an example of
the shoulder of the present invention, (,) is a front view, (bl is a flat 1 fi 1, (el is a stone side 1 n 1
(all are shown as seen through the inside)). In this linear array ultrasonic probe, a plurality of
imaging moving elements 7 are arranged in a lateral direction at a predetermined interval on one
layer of the sound-to-body impedance matching materials 5 and 6 formed in two layers, and the
upper surface is back It is formed by molding with a material 8. Each vibrator 7 is formed by
bending a strip-shaped + MII long flat plate into an arc shape in a plane perpendicular to the
arrangement direction of the vibrators 7 and bending it at the central portion. That is, as shown
in the 1st regular plane view of the twenty-first rule tC), the arrangement direction VC + lj x
square plane of the transducers 7 centered on the two points PI and P2 opposite to the radiation
direction of the beam A It is formed in the shape which made two circular arcs of equal radius R
draw on the top, and was made into a father. The upper and lower surfaces of the vibrator 7 are
respectively provided with i 49 and 1 (plus (evaporation other)), from which lead melts 11 and
12 are drawn. The vibrator 7 can be easily shaped as described above by using a flexible material
such as pvoF (polyvinylidene fluoride). According to the above-mentioned configuration, as
shown in FIG. 2 (c), the supersonic 77 shear beam A from each vibrator 7 is excellent in the
characteristic of narrowly converging in the short direction of the f array. Moreover, since it is
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not bent in the longitudinal direction, nondirectional characteristics can be obtained. Therefore,
the rJ resolution in the short direction of the array can be enhanced while effectively using the
electron focusing method and the sector scanning method. The embodiment of FIG. 3 uses the
same imaging moving member 7 as FIG. 2 and arranges the array in a shape similar to the shape
of the image sensor 7, that is, a shape in which two arcs cross each other. Even in the
longitudinal direction VC of the array, the effect of the above-described shape, that is, the effect
of producing a thin beam over the entire use depth is obtained.
Also in this case, the electron convergence method and the sector scanning method can be
effectively used by appropriately setting the delay time of the 16th which drives the pendulum 7.
Also, in a general linear arrangement, the beam swing angle in sector scanning is limited to about
± 60 'with respect to the direction directly below the transducer, whereas the outside is a dead
angle, whereas FIG. If the end portions are arranged to face outward as in the embodiment, the
dead angle can be reduced. Although the shape of the weir (2) child 7 is linear in the longitudinal
direction of the array in the second embodiment of FIG. 3 and in the embodiment of FIG. 3, it has
an arc shape like the vibrator 7 'of FIG. Then, the directivity of the beam in the direction of the
array hand can be made more omnidirectional. FIG. 5 is a three-dimensional view drawn focusing
on only the transducer array in FIG. As described above, according to the present invention, a
plurality of transducers each having a radiating surface with a side surface shape in which two
insides drawn on the same plane are drawn in the lateral direction. The array is arranged side by
side, and the ultrasound beam is emitted from the side opposite to the side where the center of
the solid spit is located, so it is omnidirectional in the longitudinal direction of the array and
narrowly converges in the short direction It is possible to improve beam characteristics, and to
improve Y-function for the sword position in the short direction direction, while effectively
utilizing the Ameko Seiho method and the sector scanning method.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a plan view showing a conventional near-array ultrasonic probe, FIG. 2 is a view showing
an example of one embodiment of the present invention seen through the inside of the present
invention, (a) is a front view, (b) Is a plan view, (c) is a right side view, FIG. 3 is a front view
showing another embodiment of the present invention, FIG. 4 is a perspective view showing a
variation of the vibrator, and FIG. It is a three-dimensional drawing drawn focusing on only one S
motion sequence.
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2.5.6 ... acoustic impedance matching material, l. 7.7 ′ ······································ 9 · · · · · · · · · · · · · · · · · ·
· · · · · ° 4 11 12 12 lead wire A A neck acoustic beam Fig.4 Fig.5 Fig.1 Page 1 0 Akira Mizutani
Yuda Noda City Michidaicho 3-chome No. 5 No. 1 Ishikawajima Harima Heavy Industries Ltd.
Tanashi Factory 0 Nominee Kaneko Shichisan Oda Michiichi Mukodaicho Sancho No. 5 No. 1
Ishikawajima Harima Heavy Industry Co., Ltd. Tanashi Factory 0 0 Akira Takama Shinkichi
Yokohama City Ayako Ward Shin Nakaharacho No. 1 Ishikawajima Harima Heavy Industry Co.,
Ltd. Yokohama No. 1 Factory 0 No. 1 Akira Toshihiko Shinohara Yokohama Shin Nakahara Town
No. 1 Ishikawajima Harima Heavy Industry Co., Ltd. Yokohama No. 1-Factory
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