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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show the structure of a conventional
focusing type ultrasonic probe, and FIG. 3 shows an embodiment of the focusing type ultrasonic
probe according to the present invention. FIGS. 4A and 4B are views for explaining a method of
forming an ultrasonic wave transmission area in FIG. In the figure, 1 is an ultrasonic transducer,
2 is a spherical concave lens, 3 is an ultrasonic beam, 4A is an ultrasonic transmission area, 4B is
an ultrasonic opaque area, 5A and 5B are ultrasonic transmission areas having different speeds
of sound. is there. The same or corresponding parts in the drawings are denoted by the same
reference numerals.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a focusing ultrasonic
probe in which an ultrasonic beam emitted from an ultrasonic transducer is focused on a point or
a line in a test material. The conventional focusing ultrasound probe of this ridge is, as shown in
FIG. 1, taking one fish nest bundle ultrasound probe as an example, it is An ultrasonic wave
emitted from a disk-shaped ultrasonic transducer (1) by installing a spherical concave lens (2)
made of acrylic material or the like on the acoustic emission surface facing the test material As
indicated by a dotted line with an arrow in the figure, the beam (3) is focused at the focal point P
in the test material t71 ¥ (1). However, it is required to focus the ultrasound beam (2) into
focus PK focusing. It was not difficult to make a spherical sunshade lens (2) having an accurate
curvature, but there was a defect that it would be expensive even if it was made. FIG. 2 is an
example of another conventional type of focused ultrasound probe that has been proposed to
improve such defects. That is, in the ultrasonic radiation probe shown in FIG. 2 V, the ball 1
concaved or Instead of this, the ultrasonic wave is almost completely reflected at the interface
between the ultrasonic wave transmission area (4A) backed by using a flat plate made of, for
example, a pebble of an acoustic attenuation factor, eg, an acrylic material, and the ultrasonic
transducer (1). One example is to provide an ultrasound impermeable area (4B) realized by an air
layer, so that the ultrasound beam (3) transmitted through the ultrasound transmission area (4A)
reaches the focal point P all in phase. A transmission area (4A) and an ultrasonic opaque area
(4B) are arranged, and in this way the ultrasonic wave (3) emitted from the ultrasonic machine
(2) motion il + is in focus, and the interference effect at φP In order to make the 5ψ focusing
ultrasound probe practical, it was used by extending each other. As described above, in the i @
sound wave probe shown in FIG. 2, the ultrasonic wave transmission forgiving, the super 8 wave
impervious area, and the ultrasonic wave do not need to be used. If it is placed on the sound
emitting surface to be made to be a test material, it is necessary to use one curvature processing
at all because it is a focused sculpting ultrasonic special contactor, but the surface price is also
low. Since a part of the strange wave beam emitted from the super wave penetrator is blocked in
the ultrasound opaque area, focusing on φP with respect to one electrical drive power of the
probe The ratio of ultrasonic power is small, so when this point-focusing ultrasonic probe is used
to detect a defect etc. in the test material, the received signal level from the two defects becomes
small and signal-to-noise The ratio is small.
There were drawbacks such as difficulty in detecting small defects. In this invention, in order to
open and close the size of these. Two types of ultrasonic wave transmission areas that are
different in sound velocity from each other (3) are constructed using materials with small
ultrasonic attenuation rates. By placing the ultrasonic beam on the acoustic radiation surface
opposite to the test material, all ultrasonic beams emitted from the ultrasonic transducer can be
focused to a point or # finish in the test material Hereinafter, one example will be described in
detail using one embodiment shown in FIG. Fig. 3 ri is an embodiment of the white focusing
shadow ultrasonic probe (1) is a disk type ultrasonic probe, + 5A), f5B) is two ultrasonic waves of
the two buildings which make up a percentage of this invention It is a transparent area.
Ultrasonic wave transmission area 15A1. f5B) The members to be contained are constructed as
shown below using materials A and B of 2pm class having small ultrasonic attenuation rates
different from each other in sound and * having the same thickness t. That is, 1 thickness l
represents the speed of sound in the materials A and B of 2 樟 頌 above by + JJ and υB,
respectively, and f is the frequency of ultrasonic waves. ルー±1. +8. If. ± .5, then 12 .pi.f
((-,-) /-^ π) is selected to be satisfied. That is, the phase of the ultrasonic beam emitted from the
one disk type ultrasonic (4) wave transducer 111 and immediately after transmission through
the ultrasonic wave transmission area (6A) and the ultrasonic beam immediately after
transmission through the ultrasonic wave transmission area (5B) Between the phase and lIπ (尋± 1. ±3. ±5. ・ Make a difference in). Further, the arrangement of the ultrasonic wave
transmission area (5A1.f5H) is determined as follows. That is, as shown in FIG. 4, on the acoustic
radiation surface of the 1-disc ultrasonic transducer (1) to be opposed to the test material, 9
points Q are moved in the above plane, Ultrasonic beam path between focal point P and PQ, ta = -If it is set, an ultrasonic wave transmission region (5A) is arranged in a region satisfying
1π ≦ PQ ≦ (m +) −) π (2). An ultrasonic wave transmission region (5B) is disposed in a region
satisfying (distance − 1) π P 2 + 2) πF 31. If ultrasonic wave transmission (5) excess areas f5A)
and + 6B) configured as nine or more are installed on the opposite surface of the nine-disk
ultrasonic transducer 111 to the test material as shown in FIG. All ultrasonic beams emitted from
the three-disc ultrasonic transducer 111 intensify in phase with each other by the interference
effect because they all reach the one point P in phase. Other than unvoiced P, they arrive at a
positive or negative phase and weaken due to interference effects. In this way, a point-focusing
ultrasound probe having a focal point P can be realized.
The arrangement method of the ultrasonic wave transmission area (5A1.45B) is opposite to that
described above in that the ultrasonic wave transmission area (5B) and the formula (3) are
satisfied in the area satisfying the formula (21) **. Even if the ultrasound transmission area (5A)
is arranged, the same @ nest as that described above can be obtained, and has a focal point P. A
focussed ultrasound probe can be realized. It should be noted that the above has described the
case of a point-focusing type ultrasonic probe, or this invention is the same as the abovementioned type of rectangular ultrasonic transducer instead of the 9-disc # super seven-wave
transducer. In the case of using two ultrasonic wave transmission areas with different speeds of
sound, which are configured to focus on a line segment using a material with a small ultrasonic
attenuation factor with a force hc and a built-in hc line segment, a line segment focusing type It
is clear that an ultrasound probe can be realized. As described above, in the focused ultrasonic
probe according to the present invention, all ultrasonic beams emitted from the ultrasonic
imaging mover are focused on the eyelid or the line segment. The ratio of the ultrasonic power
focused on two points or line segments to the electrical drive power of the child is large, so this
focussed ultrasonic probe is used to detect defects etc. in the test material. For example, the level
of the received signal from the defect is increased, and the signal-to-noise ratio is increased,
which is white. In addition, it is needless to say that there is an advantage that the manufacturing
cost can be reduced because it does not require processing of a curved surface at all as compared
with a focusing type ultrasonic probe using a single spherical concave lens.