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The present invention f'J ', s (i is related to the structure of an acoustic wave probe O Recently, as
a medical device, a tomographic image of a moving heart or abdomen 4 ultrasonic diagnostic
method P' which can be viewed in real time, Devices are rapidly spreading. These it, noninvasiveness, without danger, the tomogram of the living body information 11 (many '#! It has a
feature of being able to be +, 3, a pulse reflection method for ultrasound, de nopler method.
Although there is a transmission method, etc., it is a pulse reflection method which is widely used
at present. Principle of this pulse reflection method &: l :, supersonic C and vibrator (piezoelectric
element) J from 1 MHz to 10 MHz J) jJ "? Three different pulses are emitted, and different
acoustic indianos 7 are also included; 11 echoes due to impedance mismatches are returned from
the interface of 11 weaves (materials) 11; vibration f-'l (Ji t (A 7c can be used to obtain a
tomogram of the bovine body by displaying the position and intensity of the echo with a shadowlike tube. In this super-i ′ ′ 1-wave probe, the key properties are sensitivity and resolution. It
was announced that the sensitivity was good. The size of the echo is larger than that of the τ1
shift, and the fact that the resolution is good means that the amount of information coming from
the echo is large and the S / N is large. Two things are important to increase this resolution. One
is to increase the ultrasonic frequency so that the wavelength can be seen as thin as possible, and
the other is to appropriately damp the Q of the transducer to suppress the unnecessary
wavelength, and to reduce the size of the living body Is to suppress an erroneous signal due to
ultrasonic waves coming in the opposite direction. For this reason, the vibrator is used by being
attached to a material having a low Q quality and made of a rubber or the like called a backing
material and having a large absorption of ultrasonic waves. Efforts have also been made recently
to increase the frequency to increase the minute Wr capability. The specific structure is as shown
in FIG. 1. In the figure, 1 is a rectangular piezoelectric vibrator, and is bonded to a backing rod 4
such as rubber for several tens to several hundreds of sides, and Leads 6.6 are electrically
connected to the electrodes 2 and 3 of the piezoelectric vibrator 1 respectively. In these cases,
since the backing material 4 is made of a material that absorbs ultrasonic waves, such as rubber,
among the ultrasonic waves emitted from the piezoelectric vibrator 1, those that enter the
backing material 4 will be the original even if they are reflected at the end. When the oscillator is
returned-), it attenuates very much and does not become a false signal.
However, when the frequency to be used is recently increased to -1, it is inevitably necessary to
increase the resonance frequency of the piezoelectric vibrator 1 as well as to reduce the
thickness of the piezoelectric vibrator 1. 1 If the thickness of the piezoelectric vibrator 1 is
reduced accordingly, the width of one vibrator needs to be narrow accordingly to avoid the mode
due to the horizontal vibration of the vibrator 7, rubber, etc. It is very difficult to uniformly bond
4J thin, thin transducers of 4 / ξ thickness to the soft thing very much, and there was a limit to
increase the frequency in the method. Also, although it is preferable to make the backing
material rigid to some extent, if it becomes rigid, ultrasonic absorption or deterioration may
occur, and it may be affected by the reflection from the end face of the backing material. In the
present invention, as shown in FIG. 2, the influence of the reflection of the ultrasonic wave is
eliminated by setting the end portion γ of the backing material 4 'to be an inclined wedge with
respect to the surface to which the piezoelectric vibrator 1 is attached. . This is very
advantageous as it allows the use of materials with poor ultrasonic absorption. Specific
dimensions will be described with reference to FIG. FIG. 3 is a cross-sectional view, and in the
figure, 1 is a backing material, and the piezoelectric vibrator 4 'is a backing material, and the end
of bonding of the piezoelectric vibrator 1 to the backing material 4' and D, D ', D, D'. Let B and 交
点 be the points of intersection of the backing material end face of a perpendicular drawn
perpendicular to the backing material 4 ', and let DB = a, D'o = b, a) b. The point of intersection of
one end of the parallel line with BD is C, and the point where the ultrasonic wave from D 'is
reflected by O and intersects with DB is A. Now, assuming that the angle DBO is β, the length of
CA becomes, and if it is smaller than the length of CD, tan (1800−2β), ie, a−b, it enters the
backing material 4 ′ from the piezoelectric vibrator 1 The ultrasonic signal does not return to
the original piezoelectric vibrator 1 and is not affected by an erroneous signal. Then, when the
cross section of the end face 7 of the banking material 4 'is jagged, the point at which it vertically
descends to the piezoelectric vibrator 1 from the jagged intersection is taken as D' and the
apparent autumn piezoelectric vibrator D 'from the end Similar dimensions can be calculated by
setting the dimensions up to. As is apparent from the above embodiments, according to the
present invention, the surface facing the piezoelectric vibrator of the backing material is made
opposite to the surface with the pair j and the attachment is inclined with respect to the surface.
The influence of reflection can be eliminated, and it is possible to use a backing material that is
relatively poor in ultrasonic absorption.
Brief description of the drawings
FIG. 1d is a perspective view of a conventional ultrasonic probe, FIG. 2 is a perspective view of an
ultrasonic probe according to an embodiment of the present invention, and FIG. 3 is a crosssectional view thereof.
1 · · · Piezoelectric vibrator, 2, 3 · · · · · · · · · electrode of the vibrator, 4 '· · · · backing material, 6, 6 ·
· · · · · lead out lead.
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jps59210799, description
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