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JPS60100950

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DESCRIPTION JPS60100950
[0001]
TECHNICAL FIELD The present invention relates to an ultrasonic probe used in a medical
ultrasonic diagnostic apparatus to control transmission and reception of a sound wave. The
configuration of the conventional example and its problems There are various types of medical
ultrasonic diagnostic apparatuses depending on the purpose, and naturally there are also various
types of ultrasonic probes used for it. As a typical ultrasonic probe, a single type ultrasonic probe
using a single circular piezoelectric transducer and a large number of strip-like micro
piezoelectric transducers are arranged on a straight line. There is an array type ultrasound probe
or the like. Since the configurations of these probes are basically the same, a conventional
example will be described by taking an array type ultrasound probe as an example. FIG. 1 shows
an example of the configuration of an array type ultrasonic probe. The Q of the piezoelectric
vibrator 1 is lowered on the opposite side of the object side of the piezoelectric vibrator 1 using a
piezoelectric ceramic etc. A back load material 5 is provided via the electrode 2a to improve the
bandwidth of the characteristics and improve the mechanical strength. A plastic material filled
with a ferrite comb or tungsten powder is used as the backing material 5. On the other hand, on
the subject side of the pressure type vibrator 1, one or two acoustic matching layers 3 and 4 for
guiding the sound wave to the subject efficiently are electrodes 2b. 3 It is provided through the
developing / adhesive layer 8. Furthermore, an acoustic lens 9 is provided thereon. Reference
numerals 6 and 7 denote electric terminals, and reference numeral 10 denotes a processing
groove for dividing the piezoelectric vibrator 1. A plastic material in which glass or tungsten
powder is optically filled in the acoustic matching layer 3 on the side of the piezoelectric vibrator
1 as a material of the two acoustic matching layers 3 and 4. An epoxy resin or the like is used for
the acoustic matching layer 4 on the subject side. The acoustic impedances of these materials are
generally 8-15 × 10 5 y / cd · 8 ° acoustic matching layer on the side of the piezoelectric
vibrator 1 (hereinafter referred to as the first matching layer) 3. (Hereinafter referred to as the
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second matching layer) 4 to 2 to 4 × 1 o′′y / c4−s The thickness of the second matching
layer is generally one of -5 of the wavelength of the sound wave propagating through each
acoustic matching layer. When glass is used as the material of the first matching layer 3, the
acoustic impedance is 11 to 15 × 1 o ′ ′ ylcrd exposure S, and although the value is
appropriate in terms of acoustic impedance matching, the mechanical strength is weak. It is
necessary to adhere thinly and uniformly over 60 to 100 rrrrn via the piezoelectric vibrator 1
and an adhesive such as an epoxy resin in the manufacturing process. The thickness of the
adhesive layer 8 largely affects the characteristics (efficiency 1 resolution) of the ultrasonic
probe, and when the adhesive layer thickness is thick and uneven, it is difficult to obtain uniform
and good characteristics of the ultrasonic contactor In the case of filled plastic material, the
acoustic impedance can be arbitrarily selected (8 to 16 x 10 y / cy + bs) and it has the advantage
of high mechanical strength, but the preparation conditions of this material require pressing at a
temperature of 100 ° C or higher Therefore, after the material is made, it is necessary to bond it
on the piezoelectric vibrator 1 and it has the same drawbacks as in the case of the glass
described above.
Furthermore, since the speed of sound of this material is as low as 1600771 / SeC or less, the
ultrasonic probe becomes very thin when the frequency is increased to, for example, 80 microns
at a frequency of 5 stones, and it is difficult to manufacture There is. SUMMARY OF THE
INVENTION The present invention has been made to solve the above-mentioned conventional
problems, and of the 52 acoustic matching layers, it is 5 mechanical as a first matching layer
material on the side of a 6-diode piezoelectric vibrator. It is an object of the present invention to
provide an ultrasonic probe which has high strength and can be formed directly on a
piezoelectric vibrator without interposing dissimilar materials, and has uniform high efficiency
and high resolution characteristics. The present invention has been made to achieve the above
object, and there is provided a piezoelectric vibrator having electrodes provided on both sides,
and a first acoustic matching layer provided on one electrode surface of the piezoelectric
vibrator. A second acoustic matching layer provided on the first acoustic matching layer, wherein
the first acoustic matching layer is a thermosetting resin filled with a magnetic material. It
provides a probe. Description of Embodiments Embodiments of the present invention will be
described with reference to the drawings. FIG. 2 is a perspective view of an ultrasound probe
according to an embodiment of the present invention. The electric terminal 6 is taken out from
one of the electrodes 2a of the piezoelectric vibrator 1 by soldering or the like, and a backing
material 5 such as ferrite rubber is adhered on the surface. Next 6 +. The piezoelectric vibrator 1
is divided into a plurality of parts by machining or laser processing, and a material 1 having a
small acoustic impedance and large sound attenuation in the processing groove 10, for example,
a plastic hollow body (microballoon) mixed with silicon rubber Fill the stuff. Next, a material to
be the first matching layer 3 is poured on the surface of the common electrode 2b to form a
thickness of 5 wavelengths. As a material of the first matching layer 3, an epoxy resin light-filled
with a magnetic material is used. In the case of a radio wave absorbing material (ECCO 3 ORBCR
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124) manufactured by EMAND & CUMING as “−U”, the acoustic impedance is 11 × 1 o 5 y
Ad 11 days. The speed of sound is that which cures at 60 ° C. for 12 hours at 2500 m / sec.
Next, the terminal 7 is taken out of the common electrode 2b by soldering or the like, and a
second matching layer 4 such as an epoxy resin is formed by casting in the same formation
method as the first matching layer 3 to a thick -wavelength. Then, an acoustic lens 9 such as
silicone rubber is provided thereon. As described above, according to the present embodiment, as
the material of the first matching layer 3 in the two-layer acoustic matching layer, a magnetic
material having an acoustic impedance of 7 · −−105 impedance of 11 × 10 5 y / c shoulder · 8
is filled. It is possible to easily obtain an ultrasonic probe with high performance and uniform
properties by introducing an epoxy resin which can be cured by pouring it at a temperature of
100 ° C. or less.
That is, since there is no adhesive layer 8 between the piezoelectric transducer 1 and the first
matching layer 3 as in the conventional ultrasonic probe shown in FIG. Can be realized easily,
and a uniform and high-performance probe can be easily realized, and the acoustic impedance
also satisfies the acoustic matching condition at 11 × 10 5 y · S, and high efficiency can be
obtained. In addition, since the sound velocity is 2500 m / sec, even an ultrasonic probe with a
frequency of 6 years old has a thickness of 126 microns and can be sufficiently formed.
Furthermore, the mechanical strength is not as weak as in the case of conventional glass, and
mechanical reliability is enhanced. After the material of the first matching layer 3 according to
the present embodiment is formed on the piezoelectric vibrator 1, the material may be divided
into a plurality of pieces with the piezoelectric vibrator 1, and the material of the second
matching rod 4 It is also possible to form the sheet in advance, flow the material of the first
matching layer 3 on the piezoelectric vibrator 1 and use it as an adhesive to bond the second
matching layer 4 and manufacture it. Further, in the present embodiment, although the silicone
rubber is filled with the plastic hollow body in the processing groove 10, the material used for
the first matching layer 3 may be filled. In the embodiment 9'11, the piezoelectric vibrators are
arranged on a straight line. Although the case where the present invention is applied to a socalled array-type ultrasound probe has been described, the present invention is not limited to the
case where various piezoelectric elements such as a single type ultrasound probe or an arcarranged ultrasound probe are used. It is clear that it can be applied to a sound wave probe.
Effect of the Invention In summary, the present invention provides a piezoelectric vibrator having
electrodes on both sides, a first acoustic matching layer provided on one electrode surface of the
piezoelectric vibrator, and the first acoustic matching layer. And a second acoustic matching
layer provided in two. The first acoustic matching layer is a thermosetting resin filled with a
fugitive material. It provides an ultrasonic probe having all features, and an epoxy resin filled
with glass or tungsten powder, which has been conventionally introduced. The introduction of a
new first matching layer material instead of the ninth page 1 matching layer material and the
pouring of the new material can form the piezoelectric vibrator on the piezoelectric vibrator
without passing through different materials, so that it is uniform, high efficiency and high
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resolution. It is possible to realize an ultrasonic probe which can easily obtain all the
characteristics, improve mechanical strength and have high mechanical reliability.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of a conventional array-type ultrasonic probe.
FIG. 2 is a perspective view of an array type ultrasonic probe according to one embodiment of
the present invention. 1 · · · Piezoelectric vibrator, 2a, 2b · · · · · · · · · · · · · · · · · · · · · · · · · · acoustic
matching layer. Name of the agent Patent attorney Toshio Nakao and 1 other person Fig. 1 Fig. 2
Procedure amendment June 4, 1974, General Secretary of the Patent Office Display of the case 1
Patent No. 210103 Patent No. 210103 Title of the invention Relationship with the ultrasonic
probe 3 correction person 41 B 1 Special application Requested person Location: Osaka
Prefecture Kadoma City Oji Kadoma address 1006 Name: (582) Matsushita Electric Industrial
Co., Ltd. Person 〒 571 Housing Osaka Prefecture Kadoma City Ogata Kamonshin Address No. 6
of Matsushita Electric Industrial Co., Ltd. Target Specification of the Amendment Claim Field of
Claim Claims Detailed Description of the Invention of the Description 6 Contents of Amendment
(1) Correct the claims column of the specification as attached. (2) Correct “magnetic material”
in page 6 line 11 of the description to “magnetic material”. (3) Correct “2600 m / Sea J to r
256 om / sea” on page 6, line 12 and page 7, line 12. (4) Correct “126 microns” on page 7,
line 13 to 1128 microns ”. (5) Correct “Magnetic material” on page 8, line 17 to 1 Magnetic
material piercing. 2. Claims (1) A piezoelectric vibrator provided with electrodes on both
surfaces, a first acoustic matching layer provided on one electrode surface of the piezoelectric
vibrator, and the first acoustic matching layer And a second acoustic matching layer provided
thereon, wherein the first acoustic matching layer is a thermosetting resin filled with a magnetic
material. (2) The ultrasonic probe according to claim 1, wherein the thermosetting resin is an
epoxy resin. (3) The ultrasonic probe according to claim 1, wherein the first acoustic matching
layer is in direct contact with the electrode surface of the piezoelectric vibrator.
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