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JPH03295545

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DESCRIPTION JPH03295545
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of an ultrasonic probe used in an ultrasonic diagnostic apparatus. [Description of
the Related Art] Referring to a conventionally used ultrasonic probe, as shown in FIG. The surface
of the piezoelectric vibrator 1 is fixed by fitting and fixing the piezoelectric vibrator 1 whose
thickness corresponds to a frequency of 2.5 MHz to the opening step portion 2a of the brass
inner ring case 2 via the epoxy adhesive 3. On the (concave) side electrode 4, two acoustic
matching layers 5 and 6 are formed with a thickness corresponding to 1⁄4 wavelength in order
to achieve acoustic matching with the object. The coaxial cable 7 is soldered to the electrode 4 on
the back surface (convex surface) side of the piezoelectric vibrator 1 in order to take out an
electrical signal, and the backing is for speeding up the damping of the reflected pulse echo in
the ring-shaped inner case 2 Layer 8 is formed. The ring-shaped inner case 2 is housed with an
aluminum outer case 91 having an outer diameter of 22 am for mechanical support and
protection, and is fixed with an epoxy adhesive 10. [Problems to be Solved by the Invention] By
the way, in the above-mentioned conventional ultrasonic probe, a radial vibration mode appears
in a low frequency band near 100 kH2, and the matching with the system is insufficient.
Therefore, the present invention is intended to provide an ultrasonic probe in which a radial
vibration mode appearing in a low frequency band around 100 kHz is reduced. [Means for
Solving the Problems] The ultrasonic probe of the present invention for solving the above
problems is made by paying attention to the fact that the radial vibration mode is influenced by
the ring-like inner case, and The sound wave probe is characterized in that the ring-like inner
case is made of any one of epoxy resin, ABS resin, polycarbonate and a resin containing a filler
such as glass. [Operation] As described above, since the ring-shaped inner case of the ultrasonic
probe of the present invention is made of any of epoxy resin, ABS resin, polycarbonate, and resin
containing a filler such as glass, it is electrically When measuring the frequency-admittance
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characteristics, the level difference between the resonant 2 antiresonance points near 100 kHz is
small, and the radial vibration mode is reduced compared to the ultrasonic probe having the
conventional brass ring inner case. , And matching with the ultrasonic diagnostic apparatus can
be improved. C. Embodiment] An embodiment of the ultrasonic probe according to the present
invention will be described. In the ultrasonic probe of the structure shown in FIG. 1, the ringshaped inner case 2 is made of ABS resin in the first embodiment. The second embodiment is
made of polycarbonate.
The electrical frequency-admittance characteristics of the ultrasonic probe of the first
embodiment and the ultrasonic probe of the second embodiment and the ultrasonic probe of the
conventional example in which the ring-shaped inner case 2 is made of brass are measured near
100 kHz. The level difference (dB) between the resonance and the antiresonance was as follows.
As apparent from the above-mentioned table, the ultrasonic probes of the first and second
embodiments have a smaller level difference between resonance and antiresonance near 100
kHz, and the radial vibration mode is smaller than the ultrasonic probes of the conventional
example. It can be seen that it is reduced. When the ring-like inner case 2 is made of a rigid
material such as a resin containing a filler such as glass, the level difference between resonance
and antiresonance near 100 kHz is further reduced, and the radial vibration mode is further
reduced. Be done. Further, the level difference of resonance and antiresonance in the vicinity of
100 kHz of the ultrasonic probe of each embodiment does not change regardless of the thickness
and diameter of the piezoelectric vibrator 1. [Effects of the Invention] As described above, in the
ultrasonic probe of the present invention, the level difference between resonance and
antiresonance in the vicinity of 100 kHz is small and the radial vibration mode is reduced, so the
matching with the ultrasonic diagnostic apparatus is further improved. It will be possible. In
addition, the ring-shaped inner case is made of resin, which enables molding, and even complex
ones can be manufactured at low cost.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an ultrasonic probe.
DESCRIPTION OF SYMBOLS 1 ... Piezoelectric vibrator 2 ... Ring-shaped inner case 5.6 ... Acoustic
matching layer 7 ... Coaxial cable 8 ... Parakink layer 9 ... Metal (aluminum) production case 10 ...
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Epoxy adhesive
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