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JPS55174158

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DESCRIPTION JPS55174158
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is an assembled structural view of an ultrasonic
transducer and a damper, FIG. 1 is a view showing a conventional damper, and FIG. 2 is a view
showing a damper according to the present invention. In the figure, 1 is an ultrasonic transducer,
2 (a fine damper, 3 is an epoxy resin, and 4 is a filler. The same reference numerals are given to
the drawings, middle parts or corresponding parts. ”
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of an ultrasonic probe damper for mechanically suppressing free vibration of an ultrasonic
transducer. First, a conventional ultrasonic probe damper will be described with reference to FIG.
Explain. In Fig. 1 (a) (b), (1) is an ultrasonic transducer, C2) is a damper, (3) is an epoxy resin, and
(蜀 is a filler such as tungsten powder, tantalum powder, lead titanate powder, etc. It is used to
mechanically suppress the free vibration of the ultrasonic transducer-江. The damper +2 attached
to one side of the ultrasonic transducer +11 is an appropriate amount or a mixable limit in the
epoxy resin (3), for example, 10 to 15 with respect to the epoxy resin fl11 at a weight 1 ratio. In
general, the characteristics of the damper (2) are ultrasonic transducers (the acoustic impedance
(density × speed of sound) of the damper (25) is 25 to 30 ×). It is required to have an acoustic
impedance equivalent to 106 kg // 1.1288 o and to have a high ultrasonic attenuation. By the
way, the conventional damper is formed by mixing epoxy resin and filler such as tungsten
powder in a weight ratio of 1: 1 to 150, but in this case, the density in the element of acoustic
impedance is about 5 to 5 It is 6 g / I5. In the case of the density of this degree, the acoustic
impedance is 7 to SXIQ 'kg / n2 sec, and the difference between the acoustic impedance 20 to 3
QX106 kg / m2 eec of the ultrasonic transducer is large 1, (') 5. Therefore, the difference in
acoustic impedance is a factor in that the ultrasonic wave generated from the ultrasonic
transducer does not enter the damper but is reflected between the ultrasonic transducer and the
damper, and the effect as the damper can not be sufficiently obtained. Furthermore, the dense
filler may be deposited on the bottom of the damper during curing, and the method of settling
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may not be uniform, resulting in the dispersion of the characteristics of the damper. The present
invention has been made to solve such conventional problems, and provides a high-density and
uniform damper for an ultrasonic probe. The ultrasonic probe according to the present invention
The damper will be described in detail with reference to the drawings. FIG. 2 is a view showing
the damper for an ultrasonic probe according to the present invention. In FIG. 9, (a phantom is a
damper according to the invention, (3) is an epoxy resin, and (4 is a tungsten powder as a filler).
Next, in order to clarify the damper of the present invention, the relationship among the acoustic
impedance of the damper, the density of the damper (3), the weight of the filler, and the weight
of the epoxy resin will be described.
It can be seen that the acoustic impedance of the damper can be determined by the density ×
speed of sound of the damper, and the higher the density, the larger the acoustic impedance.
Here, the density of the damper is given by the following equation. Damper density (g 〆 1) Filler
weight color 十 epoxy-11i 17) Heavy duty C light flux material C 11 color) Weight corrosion of
epoxy resin 密度 Density of single filler ((g / ll 5) epoxy resin fist As is apparent from the above
equation, the density (g / (g13)) of the damper is largely influenced by the weight of the filler
and the weight of the epoxy resin, as is apparent from the above equation. In view of such a
relationship, this invention mixes an epoxy resin and tungsten powder at a weight ratio of 1:30 to
4 when tungsten powder is used as a filler, and then the epoxy resin wraps the tungsten powder.
They are put into the mold of the press, pressed with a force of about 1 ton, and press-formed F,
... (4) "-; By making it heat-harden and manufacture inside, the density of a damper was able to be
10-11 g / cm <3> by actual value. In addition, the experimental data at the time of using a
tantalum powder and tungsten powder as a filler is as follows. (1) Experimental data in the case
of using tantalum powder as filler (pressing force about 1 ton) "Fothing (2) Experimental data in
the case of using tungsten powder as filler (pressing force about 1 ton) □ above In the
experimental data, the actual density of the damper, (5)-the theoretical value is smaller than the
theoretical value, which is considered to be because air or the like enters between the filler and
the epoxy resin. Father According to the above experimental data, it is found that the density of
the damper is increased by increasing the weight ratio of the filler, and the density of the damper
is an experimental value by setting the weight ratio of the tungsten powder to 30 with respect to
the epoxy resin 1 It was found that the weight ratio was 10 to 11 g / lxr3-the epoxy resin and the
filler were decomposed when the weight ratio of the epoxy resin to the filler was 1:40. As
described above, the damper according to the present invention is mainly composed of tungsten
powder, the density of the damper is 10 g / l x 5 or more, the acoustic impedance is also high at
+5 kg / m 2 sec, and it is almost equal to the acoustic impedance of the vibrator. Therefore,
sufficient performance can be obtained as a damper for an ultrasonic probe. As described above,
this invention improves the density by press-forming a mixture of tungsten powder (6) and a
small amount of epoxy resin mainly composed of--1 powder, and the acoustic impedance is
further increased, and the final In other words, the present invention provides a practical damper
for an ultrasonic probe whose damping effect is improved.
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