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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional focusing
vertical probe, FIG. 2 is a view showing an example of use of the conventional focusing vertical
probe, and FIG. FIG. 4 is a view showing an angular probe, FIG. 4 is a view showing an i
embodiment of a focusing type vertical probe according to the present invention, and FIG. 5 is a
view showing an embodiment of a focusing type oblique angle probe according to the present
invention It is. In the figure, 1 is a vibrator, 2Iri lens, 3 cases, 4 test pieces, 5I- as a contact
medium, 6 is an attachment, 7 is a lens case, 8 liquids, FF 'focal point, fd focal length. In the
figure, identical or equivalent parts are denoted by the same reference symbol b =.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to an ultrasound probe
having a lens for focusing ultrasound waves. A focusing ultrasound probe generally has an ultrata lens attached to a planar transducer, and its focal length, which is commonly used in liquids, is
also displayed as an underwater distance. This is because it is possible to directly touch the test
material from the shape for the lens. Recently, in oblique angle probes, a probe capable of
directly contacting a test material in a plane has been studied. Since the probe described above
has a fixed focus type of h, ζil + line i 'l · ma' 3 '2'-', it is necessary to create a probe for various
purposes. In order to solve these problems, this invention adheres to a hollow case an ultrasonic
transducer whose spherical or cylindrical surface is opposed to the test material, and the hollow
portion is filled with a liquid, And by changing the propagation speed of ultrasonic waves in the
liquid, the focal length can be changed, and by making a part of the hollow case flat, it is possible
to provide a probe which can directly contact the flat specimen. . First, a conventional focusing
probe will be described with reference to FIGS. FIG. 1 shows a vertical probe, (1) an ultrasonic
transducer, (2) a lens for focusing ultrasonic waves, and (3) a case. Electrical signals externally
applied to the vibrator (1+ electrode (not shown)) are subjected to mechanical vibration VC
conversion by the vibrator (1) and converged to the focal point F in the medium (5) by the lens
(2) It is a fact well known to do. Generally the focus path! lf is displayed as a value when medium
(5) or water is used. In FIG. . @, (, + + 図 (Fig. 21 shows the case where the probe shown in Fig. 21
is actually inserted into the test material in water. At this time, the focus in the test material shifts
to F '. FIG. 3 is a focal angle probe which is being studied in recent years. In the figure, il + is a
transducer, (6) is an attachment that determines the incident direction of the sound wave, 141 t!
The test material, (5) is a contact medium. As described above, in the above-described focusing
type probe, there are problems such as the fixed focal length and the ability to directly touch the
test material in the vertical type. This invention solves these and provides an ultrasonic probe
which can easily change the focal length of the mouth. In FIG. 4 showing an actual example of
this invention by a drawing, il + in the drawing shows a vibrator having a spherical or cylindrical
surface facing the test material, (3) a vibrator case, and (4) the test material , (5) is a contact
medium, (7) is in contact with the above-mentioned spherical or cylindrical surface, and the
contact surface has the same shape as the above-mentioned spherical or cylindrical surface, (8) is
injected into the case (7) circle. Liquid.
The sound wave generated from the vibrator (1)-(3)-snow, is generated when passing through the
lens case (7) filled with the liquid (8) and converges to the focal point F as shown in the figure.
The distance fd to the focal point of the sound wave As well known, this depends mainly on the
radius of curvature of the transducer fi +, the speed of sound in the liquid, and the speed of
sound in the test material. It is apparent that the focal length can be changed by completely
filling the cavity portion of the lens case (7) shown in FIG. 4 with the fluid (8) different in sound
velocity. FIG. 5 shows an example applied to a focal angle probe. Similarly, sound arz focus FiC
converges. If the speed of sound of the liquid (8) is different, the focal position changes as in the
previous example. In both of FIGS. 4 and 5, the vc moving element fi + is sensible even in the case
of a spherical or cylindrical surface deviation, and in the former case, the sound i converges to a
point and in the latter case it converges to K. As described above, this invention makes the
opposing direction of the ultrasonic transducer with the test material a spherical surface or a
cylindrical surface, and the vibration of the case containing the lens for focusing the ultrasonic
wave. The focal length can be changed by setting the contact surface to the spherical surface or
the cylindrical surface and injecting the required liquid into the lens case. Water, silicone oil,
glycerin and mineral oil can be used as the liquid to be injected into the lens case.
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