JPS5640129

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DESCRIPTION JPS5640129
Description 1, title of the invention
Composite acoustic lens for ultrasonic diagnostic device probe
The present invention relates to an acoustic lens mounted on a probe of an ultrasonic diagnostic
apparatus, and more particularly to an acoustic lens mounted on a probe of an electronic
scanning ultrasonic diagnostic apparatus. Generally, the electronic scanning type ultrasonic
diagnostic apparatus is roughly divided into a sector type and a linear type according to the
scanning method, but in both types the directivity of the sound field generated by the radiated
ultrasonic waves is It is the most important to improve the receiving directivity of the ultrasonic
wave as well as to improve the quality of the image. Therefore, as shown in FIGS. 1 and 2, in
order to improve the directivity of each sound field created by such radiated ultrasonic waves
and received waves, as shown in FIGS. 1 and 2, a transducer alc as a probe, an acoustic Mounting
of the lenses b and b 'is performed. This acoustic lens b, b'H1 is divided into a concave lens as
shown in FIGS. 1 and 2 (a) and a convex lens as shown in FIGS. 1 and 2 (bl. Is due to the
difference in the propagation speed of ultrasonic waves in and out of the lens. That is, the lens
shape when the propagation speed in the lens is larger than that outside the lens is concave, and
the lens shape in the opposite case is convex. Here, when the atmosphere outside the lens is
physiological saline or water EndPage: 1, the material for the acoustic lens to be concave is, for
example, acrylic, and the material to be convex is, for example, silicone rubber. By the way, Fig. 1
(a), (a sound field pattern having a focal length F of 90 ° for both the conventional sound / bH 1
shown in bl and showing its radiation reception general directivity is shown in FIG. a) As shown
by VC, the characteristic is as shown by the code C. However, with such an acoustic lens b having
a relatively long focal length, there is a problem that the sound field pattern C is good at a far
place from this lens b, but is bad at a near place. 2 (a) j (the conventional acoustic lens bin shown
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by blVc, all of which have a focal length F of 55 + a +, and the sound field pattern has
characteristics such as symbol d as shown in FIG. 5 (b) K. It becomes VC. However, in contrast to
the above-mentioned long focal length acoustic lens b, the acoustic field pattern C is good at a
position near this lens b ', and the sound field pattern C is good at this far off point for the five
relatively short focal length acoustic lenses b'. The present invention is intended to solve these
problems, and an ultrasonic diagnostic apparatus capable of improving the sound field pattern
near and far from the lens surface by devising the shape of the lens surface. An object of the
present invention is to provide a composite acoustic lens for a probe.
For this reason, a composite acoustic lens for an ultrasonic diagnostic device probe according to
the present invention is a first type of acoustic lens mounted on a probe of an ultrasonic
diagnostic device, the lens surface of which has at least a first focal point. It is characterized in
that it comprises a curved surface portion and a second curved surface portion having a second
focal point, and the second curved surface portion is formed at the central portion of the first
curved surface portion. Hereinafter, it is explanatory drawing shown with a pattern with the
compound type acoustic lens for ultrasonic diagnostic devices probe as an example of a noninvention by drawing. The acoustic lens 1.1 'shown in FIGS. 3 and 4 (a) and (b) VC has different
shapes such as concave and convex, but the difference in the shape is due to the difference in the
material as described above. The sound field pattern 2 is the same as shown in FIG. 5 (C) Vc. Also,
the point that both the lenses 1 and 1 'are attached with the transducer 3Vc as a probe of the
ultrasonic diagnostic apparatus is the same. As the acoustic lens 1, a material such as acrylic is
used, and as the acoustic lens 1 ′, a material such as silicone rubber is used. By the way, as
shown in FIGS. 3 and 4 (a) vc, the lens surface IQj of the acrylic concave acoustic lens 1, the first
concave cylindrical surface portion as the first one surface portion having a focal length of 90 m.
1a (having a radius of curvature of about 45) and a second concave cylindrical surface portion
1b (having a radius of curvature of about 25 ttan) as a second curved surface portion having a
focal length of 55 鰭. In addition, the cylindrical surface portion 1b is formed at the central
portion of the cylindrical surface portion 1a. In addition, as shown in FIGS. 3 and 4 (b), also on
the lens surface of a convex acoustic lens 1 'made of silicone rubber, a first convex cylinder as a
first curved surface portion having a focal length of 9 Q mm. A central portion of a cylindrical
surface portion 1'a is formed with a surface portion 1'a and a second convex cylindrical surface
portion 1 / b as a second curved surface portion having a focal length of 55 throats. The
cylindrical surface portion 1'b is formed on the The curved surface shape corresponding to the
predetermined focal length is not strictly a cylindrical surface, but as shown in FIG. 4, a
cylindrical surface is sufficient as an approximation. Furthermore, the lens dimensions are about
20 M for D1 and about 100 for D2. As shown in FIGS. 3 and 4 (a) and ('b) VC, the non-acoustic L
/ 7 window 1 ° 1' has a first cylindrical surface portion 1a, 1 'whose lens surface has a first
focal point. It is configured as a composite acoustic lens in which a second cylindrical surface
portion 1b, l'b having a second focal point is formed at the center of a, and the sound field
pattern of this lens 1, 1 'is measured Then, a pattern 2 as shown in FIG. 5 (C) is obtained.
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This sound field pattern 2 has a portion similar to a good pattern portion far from the lens b in
the sound field pattern C shown in FIG. 5 (conventional EndPage: 2 shown in al, and FIG. 5 (bl-i
Of the sound field pattern d of the rice, a portion similar to a good pattern portion close to the
lens b 'is provided, so that, according to the present acoustic lens 1.1', the lens 1, 1 Good sound
field pattern 2 can be obtained near or far from 1 ', and as a result, directivity can be improved
over a wide range, which contributes to significant improvement of image quality. As in the
above-described embodiment, the lens surface may be formed of two or more types of curved
surface portions, or may be formed of three or more types of curved surface portions. As
described above in detail, according to the complex acoustic lens for an ultrasonic diagnostic
device probe of the present invention, the second lens surface is at the center of the first curved
surface portion 1a + 1a having at least the first focal point. The second curved surface portion 1b
having a focal point of (t is formed as a lens, so that obtaining a good sound field pattern near or
far from the lens can achieve a significant improvement in image quality. It is
4. Brief description of the drawings Fig. 1 (al, (bl and Fig. 2 (a), (blu are all schematic views
showing the mounting state of the conventional acoustic lens, and Figs. 3 to 5 show the present
invention) 3 and 4 (a schematic view and an enlarged perspective view showing a mounting state
of a concave composite acoustic lens according to the embodiment of the present invention, and
an enlarged perspective view thereof; Fig. 4 (b) is a schematic view and an enlarged perspective
view showing the mounted state of the convex composite acoustic lens, and Fig. 5 is an
explanatory view showing the sound field butter / together with a conventional sound field
pattern. 1.1 '· · Acoustic lens, 1a, l'a · · First cylindrical surface portion as a first curved surface
portion, 1b, l'b · · Second cylindrical surface portion as a second curved surface portion , 2 · ·
Sound field pattern, 3 · · Vibrator as a probe. Attorney patent attorney Yoshihiko IinumaEndPage:
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