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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezo rubber probe, and in particular, to enhance the attenuation effect and improve the difficulty
in discriminating between a conventional oscillation ultrasonic signal and an echo reception
signal from a close distance. is there. (Conventional art) An acoustic probe in which a ceramic
piezoelectric vibrator provided with electrodes on both sides is bonded to a base, which is
conventionally referred to as a gumba which suppresses free vibration, or a holder. An array-type
ultrasonic probe is known in which a large number of small-grained piezoelectric vibrators are
bonded to the surface of a base, except that there is a drawback that it is difficult to adhere to a
curved surface such as a metal primitive Even the one in which the base surface to which the
piezoelectric vibrator is bonded has a curved surface has been proposed. (Problems to be Solved
by the Invention) However, since a conventional ultrasonic probe bonds a ceramic piezoelectric
vibrator provided with electrodes on both sides, the piezoelectric vibrator is, for example, a smallsized array type. However, it is impossible to bring the piezoelectric vibrator into complete
contact with the base, which makes the damping effect defective. Also, even if they are
completely in close contact with each other, the acoustic impedances of the base and the
piezoelectric vibrator differ from each other, so that reflection occurs there and the damping
effect is not good. On the other hand, the piezoelectric vibrator acts as an ultrasonic wave
oscillator and a receiver of echoes, and if the attenuation effect of the vibrator is poor, an echo
signal from a close distance is at the end of the attenuation of the oscillating ultrasonic wave. It
has a defect that makes it difficult to determine the transmitted and received signals. (Means for
Solving the Problems) The defects described in the preceding paragraph are bonded to the base
of a ceramic piezoelectric vibrator having electrodes provided on both sides, which is
conventionally known! 7P! You can clarify by experiment that you can not improve as long as
you keep the commandments. In the present invention, a C, a flexible composite piezoelectric
material for the piezoelectric vibrator, a flexible composite conductive material for the electrode,
and the same material as the packing layer constituting the base, and the acoustic impedance is
equalized. It is. That is, according to the first aspect of the present invention, an electrode layer in
which metal particles are mixed with an organic substance (an electrical conductivity is imparted
to the baking layer) on a packing layer formed by mixing metal powder or ceraminc powder with
organic substance Then, it can be omitted), and a piezoelectric layer formed by mixing a
piezoelectric ceramic powder with an organic substance is further deposited thereon, and an
electrode layer equivalent to the above is further deposited on the piezoelectric layer. The second
invention achieves the same object by using a conductive packing layer. (Function) With the
above configuration, as shown in f: 1 & 5, particles of metal etc. in the packing layer, metal
particles of the electrode, piezoelectric powder particles of the piezo layer are continuously
arranged in the rubber and acoustic impedance of each layer is equal. There are no particles
dispersed in the organic substance in the piezoelectric element C as in the conventional
configuration of FIG. 6, and the metal particles in the organic substance are similarly dispersed
i.sup.i.sup. Make the effect extremely good.
The preferred embodiment of the present invention will now be described. (Example) FIG. 1.2
shows an example of the present invention, and as shown in FIG. 1, metal powder or ceramic
powder is mixed with rubber, kneaded and formed into a predetermined shape, and metal The
same rubber and the same vulcanization as that of using a metal powder such as silver on the
packing layer 1 based on the packing layer 1 formed by mixing a vulcanizing agent such as an
oxide, peroxide, or sulfur type A conductive paste prepared by mixing and diluting a solvent such
as toluene and the like with kelp) is applied by a screen to form a first electrode layer.
Subsequently, the same rubber as that used for the electrode layer 2 of the packing layer 1 and
f51 on the first electrode layer 2 is a piezoelectric ceramic powder such as lead titanate, lead
titanate norconate, bismuth 7 elast, etc. The piezo layer 3 is formed by mixing together the same
vulcanizing agent, and a conductive paste of the same material as the first electrode layer 2 is
applied on the piezo JVI 3 by the same method as described above to form the electrode layer 4
of Pt52. Form The opposing surfaces of the packing layer 1 and the first electrode layer 2 and
the opposing surfaces of the first and second electrode layers 2.4 and the piezoelectric layer 3
are integrated by fusion of the respective rgJ 1 to 4 by vulcanization treatment. Glued to. In
addition, 5 is a tr fn matching layer, and a rubber plate or a polyester film is used, and the
thickness is set to 1⁄4 wavelength goodness of the medium, but the thickness of the electrode
layer 4 of f52 is the medium When it is set as the 1⁄4 wavelength length of and substituted as
the sound 5 matching layer, it may be omitted. Since the rubber composite material is used as the
packing layer 1 on the upper side, the first electrode layer 2, the piezoelectric layer 3 and the
electrode N4 of @ 2 sequentially deposited on the layer 1 are also formed of the same rubber
composite material. However, when the packing layer 1 is formed of a resin-based composite
material, the same applies to the first and second electrode layers and the piezoelectric layer,
respectively! 1) A composite material is selected. When metal powder is mixed into an organic
substance made of rubber or resin as the packing N1 to impart conductivity, the electrode layer 2
of 11 is omitted, and the piezoelectric WI 3 and the second electrode layer 4 are directly
provided thereon. It can be coated. FIGS. 3 and 4 show the results of examining the performance
due to the structural difference between the piezoelectric transducer of the present invention and
the conventional piezoelectric transducer. The conventional vI configuration is as shown in FIGS.
4 and 5 and the oscillation waveform is as shown in FIG. 4 and the graph which is enlarged by 1
in the measurement part (b) of the damping rate is the fourth As shown in Fig. 3, the damping
time is as large as about 1 μSee. On the other hand, the oscillation waveform of the present
invention is as shown in FIG. 3 (A), and the graph of FIG. 3 (A) is an enlarged graph of the
measurement part of the damping rate. It is clear that it is as good as about 5 .mu.sec and about
1/2 in comparison with FIG.
As shown in FIG. 4H, if the time required for attenuation is large, an echo signal that oscillates in
the previous cycle and is reflected at a close distance is received by the piezoelectric element and
becomes a kind of interference, and it is impossible to discriminate the signal or Although
discrimination is difficult, the piezoelectric probe according to the present invention has a
shorter attenuation time as compared to the prior art as shown in FIG. 3H, so that the oscillation
signal and the above-mentioned echo signal interfere with each other. There is no. (Effects of the
Present Invention) According to the present invention having the above-described configuration,
the blanking / i! 1, ttSl of electrode layer 2, piezo N3, second electrode layer 4 or packing layer 1
and piezo layer 3, electrode layer 4 with the ups and downs dissatisfaction effect in equalization
of sound veins and disassembly Because of the configuration to enhance the performance, it is
possible to prevent interference between echo reception signals, especially at a close distance,
and the oscillation wart, and the whole is made of a rubber-based or resin-based composite
material. Therefore, it has unique effects such as visibility, flexibility, concave and convex shapes
so that the human body can be easily attached to metal structures and the like.
Brief description of the drawings
FIG. 1 is a perspective view of the present invention and Pt 52 is a side view of a finished
f53 Figures 1 and 2 are graphs measuring the effect of the present invention, Figures 4I and 4
are graphs relating to the attenuation effect of the conventional ultrasonic probe, and Figure 5 is
an overhead view of particle dispersion in the rubber of the present invention FIG. 6 is a diagram
of a conventional device using a piezoelectric ceramic.
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jps63126283, description
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