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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound attenuating material for ultrasonic waves, and in particular to ultrasonic waves suitable as
a material for a back plate used in an ultrasonic transducer such as an ultrasonic probe. The
present invention relates to a sound attenuating material. [Background Art] The back plate as a
transducer holder used in an ultrasonic probe or the like generally functions as its function to
promote the vibration at the time of excitation of the transducer and free the transducer at the
time of non-excitation. It is required to have the property of suppressing the vibration, and the
efficiency (the property of absorbing and attenuating etc.) of the ultrasonic wave of the
transmission level transmitted from the vibrator. This kind of property required for this back
plate, in other words, (a) acoustic impedance has a value close to the acoustic impedance of the
ultrasonic transducer, thereby making it possible to match the acoustic matching with the
transducer. It can be concentrated on two points: that it can be achieved, and (ii) it is a member
with high absorption and attenuation of ultrasonic waves. On the other hand, it is difficult to find
a member that satisfies all the above properties, and thus, as a material of the back plate, a clothcontaining Bakelite or tungsten powder solidified with an epoxy resin is relatively often used. The
[Problems to be Solved by the Invention] However, in the back plate in the above-mentioned
conventional example, for example, the acoustic impedance of Bakelite is as low as 174 to 1/8 of
the ultrasonic transducer, while tungsten powder is epoxy. In the case of those solidified with
resin, there was a problem in attenuation of ultrasonic waves, and both had disadvantages. The
present invention ameliorates the disadvantages of the prior art, and is an ultrasonic wave
suitable for use as a back plate, the acoustic impedance of which exhibits a value close to the
acoustic impedance of an ultrasonic transducer and the attenuation of ultrasonic waves exhibits a
relatively large value. The purpose is to provide a river sound #damping material. [Means for
Solving the Problems] Therefore, according to the present invention, there is provided an
acoustic damping material for ultrasonic waves, which comprises mixing an appropriate amount
of tungsten powder into a synthetic resin such as epoxy resin and solidifying it. In order to
achieve the above object, the present invention is configured to mix an appropriate amount of
inorganic powder. DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiments of the
Invention) 11 Hereinafter, one embodiment in the case where the present invention is applied to
an ultrasonic probe will be described based on FIGS. 1 and 2. FIG. In FIG. 1, 1 indicates a main
body case and 2 indicates a connector. The main body case 1 is formed in a substantially
cylindrical shape in the present embodiment, and a step IA is attached to the lower end of the
Below the step portion IA of the main body case 1, as shown in FIG. A circular ultrasonic
transducer 4 is fixed to a central portion of the upper end surface of the delay member 3 in FIG.
1 and a backing 5 is fixed on the ultrasonic transducer 4. Then, the case body 1 including the
backing material 5 is filled with a filler 6 such as an epoxy resin. 9 shows a lid and 9A shows a
layer of epoxy resin. 4A and 4B indicate lead wires respectively. Furthermore, the delay member
3 is formed in a cylindrical shape by a member with little attenuation of sound, and a bellows-like
unevenness is formed around it as shown in FIG. Further, as shown in the figure, a sound
absorbing material 7 made of epoxy resin or the like is attached to the uneven portion 3A. For
this reason, among the reflection echoes reflected with a certain spread, the reflection echo of
the part spread to the outside is scattered by the concavo-convex part 3A of the delay member 3
and largely absorbed by the sound absorbing function of the sound absorbing material 7. It is
possible to detect only relatively clear reflection echoes. -On the other hand, in the present
embodiment, as the ultrasonic transducer 4, a disk-like lead niobate-based (PbNbzOa) acoustic
impedance (pc) = approximately 21 × 10 b (kg / m ′ ′ · sec) is used It is done. The backing
material 5 has high attenuation of ultrasonic waves and an acoustic impedance (ρC) because it is
necessary to suppress free vibration of the ultrasonic transducer 4 and to absorb and attenuate
the ultrasonic waves propagating to the backing material 5 side. An ultrasonic sound attenuation
material having a value close to that of the vibrator 4 is used. As this acoustical attenuation
material for ultrasonic waves, an epoxy resin in which an appropriate amount of tungsten
powder is mixed, and at the same time, for example, acetone as a diluent is added, and an
appropriate amount of inorganic powder is mixed is used. There are various materials for this
inorganic powder, but talc (3MgO + 4Si (h + fhO)) is used in this embodiment. As a result, by
mixing an appropriate amount of the talc, it is possible to dramatically increase the amount of
attenuation of the ultrasonic wave as shown in the diagram B in FIG. Those in the range of
24xlOl'CKg / m "-5et) are easily obtained by scratching. For this reason, in the present
embodiment, the ultrasonic transducer 4 can perform free vibration at the time of excitation, so
that it can output ultrasonic waves having a relatively high level, and when it is not excited, it can
perform free vibration of the transducer. The advantage is that it is possible to output efficiently,
suppressed, and short-pulsed ultrasonic waves with excellent resolution.
Furthermore, the ultrasonic wave that propagates to the backing material 5 side when the
vibrator 4 vibrates can be efficiently absorbed by the action of the above-described talc etc., and
the backing material 5 side is also detected as noise at this point. There is an advantage that the
reflected wave from the signal can be significantly reduced, so that the reception sensitivity of
the ultrasonic transducer can be significantly increased. In the above embodiment, although the
case where talc powder is mixed as the raw material of the inorganic powder mixed in the
acoustic attenuation material for ultrasonic waves is exemplified, the present invention is not
necessarily limited to this, and other inorganic powder is mixed. May be [Effects of the Invention]
As described above, according to the present invention, an acoustic attenuation material for
ultrasonic waves is prepared by mixing an appropriate amount of tungsten powder into a
synthetic resin such as epoxy resin and solidifying it. Since the structure of mixing the amount of
the inorganic powder is adopted, the acoustic impedance has a value close to the acoustic
impedance of the ultrasonic transducer, and the attenuation amount of the ultrasonic wave is not
set conventionally by the action of the inorganic powder. It is possible to provide an ultrasonic
sound attenuating material having very excellent properties as a backing material.
Brief description of the drawings
1 FIG. 1 is a cross-sectional view of an ultrasonic probe showing an embodiment in the case of
using the acoustic attenuation material for ultrasonic waves according to the present invention as
a backing material, and FIG. 2 is a conventional tungsten powder hardened with an epoxy resin.
It is a diagram which shows the result of the comparative experiment with things.
4---Resonator, 5----A back plate made of an acoustic attenuation material for ultrasonic waves
Patent applicant Tokyo Metropolis Inc. Figure 1 Figure 2 (, 9-1 his frequency Maki)
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