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DESCRIPTION JPS61113434

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DESCRIPTION JPS61113434
[0001]
The present invention relates to a method of manufacturing an ultrasonic probe in an ultrasonic
drag-free device or the like that measures speed. The structure of the prior art and its problems
The ultrasonic probe of the ultrasonic doppler apparatus is composed of an inner cylindrical
transducer portion 1 and an outer cylindrical transducer portion 2 as shown in FIG. The inner
cylindrical transducer portion 1 connects the lead wire 6 to the upper surface electrode 4 and
the lower surface electrode 5 of the piezoelectric vibrator 3. Next, an acoustic matching layer 7 in
which a synthetic resin or glass is laminated in multiple layers is adhered to the upper surface of
the upper electrode 4, and a back load material 8 made of rubber or the like is adhered to the
lower surface of the lower electrode 6. The cylindrical transformer ? juicer portion 1 is formed
to have an outer diameter of about 6 fi and mainly performs transmission. On the other hand, the
outer cylindrical transducer portion 2 connects the lead wire 12 to the upper surface electrode
10 and the lower surface electrode 11 of the piezoelectric vibrator 9. Next, the acoustic matching
layer 13 is adhered to the upper surface of the upper surface electrode 10, and the back load
material 14 is adhered to the lower surface of the lower surface electrode 11. The cylindrical
transducer unit 2 mainly performs reception. Then, the cylindrical transducer portion 1 is placed
inside the cylindrical transducer portion 2. Thereafter, the rubber adhesive 15 is filled in the
space between the cylindrical transducer portion 1 and the cylindrical transducer portion 2. In
the conventional manufacturing method as described above, since the gap between the
cylindrical transducer portion 1 and the cylindrical transducer portion 2 is adjusted by the eye
spacing, the gap is uniformly adjusted to about 0.5 and maintained. It was difficult to do.
Therefore, there has been a drawback that the electrical characteristics of the ultrasonic doppler
probe are degraded, that is, the crosstalk is uneven and the crosstalk is increased due to the wide
and narrow gaps. SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the
present invention can easily maintain uniform spacing between a cylindrical transducer portion
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and a cylindrical transducer portion, thereby reducing the variation of cross) and reducing the
crosstalk value. SUMMARY OF THE INVENTION It is an object of the present invention to provide
a method of manufacturing an ultrasonic probe which can improve electrical characteristics and
can be easily manufactured. Configuration of the Invention) In order to achieve the above object,
the present invention inserts a cylindrical transducer portion having a piezoelectric vibrator into
a uniform thick annular projection formed on a positioning member, and has a piezoelectric
vibrator. A cylindrical transducer portion is fitted on the outside of the upper annular projection,
and an adhesive is filled in the gap between the positioned cylindrical and cylindrical transducer
portions to form a gap between the outer circumferences of the cylindrical and cylindrical
transducer portions. Are kept uniform.
Description of the Embodiments Hereinafter, embodiments of the present invention will be
described in detail with reference to the drawings. FIGS. 2 (8), (B) and (q show a first embodiment
of the present invention. First, an inner cylindrical transducer portion 21 shown in FIG. 2 and an
outer cylindrical transducer portion 22 shown in FIG. 2 and a positioning member 36 shown in
FIG. 2 (q) are formed. A cylindrical square-shaped transducer portion 21 connects the lead wire
26 to the upper surface electrode 24 and the lower surface electrode 26 of the piezoelectric
vibrator 23 made of piezoelectric ceramic. Next, the acoustic matching layer 27 formed of
synthetic resin or glass in a multilayer is adhered to the upper surface of the upper surface
electrode 24, and the back load material 28 made of rubber or the like is umbrellaly adhered to
the lower surface of the lower electrode 26. The cylindrical transducer portion 21 has an outer
diameter of about 6 mm and mainly transmits. As shown in FIG. 2B, the cylindrical transducer
portion 22 connects the lead wire 32 to the upper surface electrode 30 and the lower surface
electrode 31 of the piezoelectric vibrator 29 made of piezoelectric ceramic. Next, an acoustic
matching layer 33 formed of synthetic resin or glass in a multilayer is adhered to the upper
surface of the upper surface electrode 3o, and a back load material 34 made of rubber or the like
is adhered to the lower surface of the lower surface electrode 31. The cylindrical transducer
portion 22 has a hole 35 at its central portion formed to have a diameter of about 7 mm, and
mainly performs reception. A positioning member 36 for positioning the cylindrical transducer
portion 21 and the cylindrical transducer portion 22 is formed as shown in FIG. The protrusion
38 is integrally provided. The annular projection 38 has a uniform thickness, an outer diameter
of about ?7 + m, and an inner diameter of about ?6 + m. Then, as shown in FIG. 2 (as shown in
q (q), the cylindrical transducer portion 21 is inserted from the back load member 28 side and
adhered to the inside of the annular projection 38 of the positioning member 36. The transducer
portion 22 is fitted and bonded from the back load member 34 side. In this manner, the
cylindrical and cylindrical transducer portions 21 and 22 are positioned by the positioning
member 36, and the space between them is formed in a uniform gap of about O and S2.
Thereafter, the gap is filled with a rubber-based adhesive 39, and the distance between the
cylindrical and cylindrical transducer portions 21 and 22 is uniformly maintained. FIG. 3 shows a
second embodiment of the present invention. In the present embodiment, the cylindrical
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transducer portion 21 is inserted from the acoustic matching layer 27 side to the inside of the
annular protrusion 38 of the positioning member 36, and the cylindrical transducer portion 22
to the acoustic matching layer 33 side from the annular protrusion 38. More closely fit, the
distance between the cylindrical parts 21 and 22 and the cylindrical parts 21 and 22 is uniformly
maintained.
After the rubber adhesive 39 is cured, the positioning member 36 is removed from the
cylindrical and cylindrical transducer portions 21 and 22. Accordingly, the positioning member
3? can be used as a jig, which is advantageous in cost. The other configuration is the same as
that of the first embodiment. According to the present invention, as is apparent from the above
description, according to the present invention, a cylindrical transducer portion having a
piezoelectric vibrator is inserted inside an annular projection of uniform thickness formed on a
positioning member, and a piezoelectric vibrator The cylindrical transducer portion having the
above is fitted to the outside of the above annular projection, and the gap between the cylindrical
and cylindrical transducer portions thus positioned is filled with an adhesive to form an outer
periphery of the cylindrical and cylindrical transducer portions. The interval between the two is
kept uniform. Therefore, there is an advantage that the variation of the crosstalk can be reduced,
the crosstalk value can be reduced, the electrical characteristics can be improved, and the
manufacture can be extremely easily performed.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially cutaway perspective view showing an ultrasonic probe in an ultrasonic
doppler probe manufactured by a conventional manufacturing method, and FIGS. 2 (8), (B) to (q)
show ultrasonic ultrasonic probes of the present invention. An explanatory view showing a first
embodiment of a method of manufacturing an ultrasonic probe in a probe, and FIG. 3 is a
sectional view for explaining a second embodiment of the present invention.
21 иииииии Columnar transducer section 22 ииииииииии Cylindrical transducer section 23 ииииии Piezoelectric
vibrator, 24 ииииии Top electrode, 26 ииии ... lower electrode, 26 ...... lead, 2 A ...... acoustic Matsuchingu
layer, 2B ...... backing layer, 29 ...... piezoelectric vibrator, 3o и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и Acoustic matching layer, 34 и и и и и back load material , 36: Positioning member, 38:
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Annular projection, 39: Adhesive.
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