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DESCRIPTION JPS62231596

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DESCRIPTION JPS62231596
[0001]
BACKGROUND OF THE INVENTION The present invention relates to a mechanical it converting
element that uses a flexible piezoelectric material to convert mechanical stress into an electrical
signal or convert an electrical signal into mechanical vibration. <Conventional art> This kind of
flexible piezoelectric material applied to the electromechanical transducer is made by mixing
ferroelectric ceramic particles such as lead zirconate titanate and lead titanate in synthetic
rubber or synthetic resin, The flexibility makes it easy to displace against mechanical stress and a
good output voltage can be obtained. Therefore, ultrasonic transducers, underwater
microphones, vibration detection sensors for internal combustion engines, string vibration
pickups for electric pianos, etc. It is used in a stack of applications. As this electromechanical
transducer, two flexible electrodes are disposed via a piezoelectric layer made of a flexible
piezoelectric material, and the piezoelectric layer is polarized in the corresponding direction of
the two electrodes, at least one of them. An electrode is connected to the lead so that a signal
voltage corresponding to the mechanical stress is extracted from the lead. However, in this type
of conventional structure, when a load is applied by pulling, bending or rocking of the lead wire
at the connection portion of the lead wire, this acts on the pressure layer ii as a mechanical
stress, Noise was generated, causing false detection. An object of the present invention is to
provide a electromechanical transducer capable of preventing generation of a voltage due to a
load at the connection portion of the lead wire and extracting a good signal voltage. Means for
Solving the Problems> As for the unexplained 11, two flexible electrodes, at least one of which is
an outer cover electrode, are disposed via a piezoelectric layer made of a flexible piezoelectric
material, In the electromechanical conversion element in which the layer is polarized in the
corresponding direction of the two electrodes and the electrode is connected to the lead wire, an
insulating layer is interposed between the piezoelectric layer and the covering electrode at the
connection side peripheral portion of the lead wire It is characterized by wearing. Here, the
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flexible piezoelectric material includes a piezoelectric rubber, a piezoelectric resin, and the like.
Moreover, a conductive rubber etc. exist as a material applied to an electrode layer. In the
present invention, since the insulating layer is interposed between the piezoelectric layer and the
covering electrode at the connection side peripheral portion of the lead wire, the voltage can not
be extracted from between the two electrodes at the peripheral portion. Therefore, even if a load
is generated by pulling a lead wire or the like at the connection side peripheral portion, the load
is not converted into an electric signal and no noise is generated. EXAMPLE FIG. 1 shows the
present invention applied to an electromechanical transducer 1 in the form of a coaxial cable.
Here, 2 is a piezoelectric layer made of piezoelectric rubber, and a core electrode layer 4 made of
conductive rubber having a core electrode 3 made of a linear conductive material is embedded in
the center thereof.
In addition, an outer cover electrode layer 5 made of conductive rubber is formed on the outer
periphery thereof. The outer cover electrode layer 5 covers the end of the piezoelectric layer 1
and a moisture-proof paint or the like is applied around the outer cover electrode layer 5
according to the heart's safety. A lead wire 6 has a known configuration in which a conducting
wire 7 is inserted through the center of the lead wire, and a conductive braid 9 is coated on the
outer peripheral surface through an insulating layer 8. The core electrode 3 is exposed from the
end of the electromechanical transducer 1 and connected to the conducting wire 7, and the
conductive tube 10 is externally fitted between the electromechanical transducer 1 and the lead
wire 6. The outer cover electrode layer 5 and the conductive braid 9 are electrically connected by
the conductive tube 10. In the above configuration, an insulating layer 11 such as a rubber plate
is interposed between the piezoelectric layer 2 on the connection side peripheral portion of the
lead wire 6 and the outer covering electrode 5. FIG. 2 is an application of the present invention to
a plate-shaped electromechanical transducer 20, and on the upper and lower surfaces of the
piezoelectric rubber plate 21 (pressure layer), outer cover electrodes 22 and 22 made of
conductive rubber are provided. It is formed. A conductive braid 23 ° 23 for connection is
embedded in each of the jacket electrodes 22. 22. At the end of the piezoelectric rubber plate 21,
the conductive braids 23.23 are exposed and lead wires 24.24 are connected. Even in this
configuration, the insulating layer 25.25 is interposed between the piezoelectric rubber plate 21
and the sheath electrodes 22 and 22 on the connection side peripheral portion of the lead wire
24.24. According to the present invention, as described above, since the insulating layer is
interposed between the piezoelectric layer and the jacket electrode at the connection side
peripheral portion with the lead wire, the connection by pulling the lead wire, etc. Even if a load
is generated in a part, it is not converted into a voltage around the connection part, and thus
there is an excellent effect such as being able to obtain a good output signal.
[0002]
Brief description of the drawings
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[0003]
The attached drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal
cross-sectional view of an embodiment in which the present invention is applied to a coaxial
electromechanical transducer 1, and FIG. It is a vertical side view of the applied example.
e: mechanical-electrical conversion element 2; pressure 'Iti layer 3: core electrode 5: jacket
electrode 7: lead wire 11. Insulating layer 20. Electromechanical conversion element 22: outer
cover electrode 24; lead wire 25: insulating layer
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