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DESCRIPTION JPS60189182

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DESCRIPTION JPS60189182
[0001]
The present invention relates to a structure for taking out an electrode terminal from a polymer
piezoelectric film having a good and robust bonding structure, or a bonding structure between a
polymer piezoelectric film and a conductor. In recent years, single-layer or multi-layer (eightimorph) polymeric piezoelectric films made of vinylidene fluoride resin and the like have begun
to be widely used as electromechanical conversion elements for applications such as vibration
sensors, microphones, and speakers. And the application which made use of the lightness, rII
flexibility, flexibility, processability, etc. which are the characteristics of a polymer is proposed
and put to practical use. For example, the advantage of using such a polymeric piezoelectric
material 1 ? is well understood for a vibration sensor used for measuring the vibration
characteristics of various devices. That is, in the past, electrode films were provided on both sides
of a ceramic piezoelectric film such as PZT by vapor deposition and lead wires were soldered to
the respective electrode films, for example. Such a ceramic acid vibration sensor has a drawback
that the measurement accuracy is degraded because the followability is poor when the object is a
curved surface. Further, there is a disadvantage that it is difficult to measure a high frequency
vibration which can be measured, for example, a turbine or the like having a measurable
frequency of 500 Hz or less. On the other hand, a polymer piezoelectric film which does not have
such a defect, can be easily made into a thin film suitable for high frequency vibration, and is
excellent in flexibility, constitutes an electromechanical transducer or an electroacoustic
transducer. It is suitable for wood. However, when such a polymeric piezoelectric film is used as
an electromechanical transducer or the like, the lead-out portion of the lead wire from the
electrode is generally brittle and easily pulled, and can withstand continuous use under vibration
conditions and the like. It is a big problem in that it is not. 'A method of bonding lead wires to an
electrode film on a polymeric piezoelectric film using a conductive adhesive formed by dispersing
conductive materials such as metal powder and carbon powder in various resin binders It is
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relatively fragile in structure and can not withstand continuous use added to its use as an
electromechanical transducer such as a vibration sensor, of course, it has to be used for many
years, and it is necessary to use intrusion sensors, pyro sensors such as fire detectors, fans It
impairs the reliability of various piezoelectric elements such as bimorphs such as light switches
(not to exclude a similar structure used as a pyroelectric element as understood from the above
expression). In addition, as the most basic idea of the lead wire extraction structure, as in the case
of the vibration sensor for ceramic acid, it is the polymer piezoelectric film itself that the lead is
soldered to the electrode film provided on the polymer piezoelectric crotch Is inadequate because
it is degraded by heat.
In view of the above-mentioned circumstances, the main object of the present invention is to
provide a durable electrode lead-out structure from a polymer piezoelectric film. According to the
study of the present inventors, it is found that the above-mentioned object can be achieved by
utilizing the flexibility which the polymeric piezoelectric film has even after the electrode film is
provided on both sides thereof. It was done. That is, in the electrode terminal taking out structure
of the polymer piezoelectric film of the present invention, the conductive core material is formed
in the vicinity of the end of the strip-shaped piezoelectric element formed by providing the
electrode film on the front and back surfaces of the banded polymer piezoelectric film.
Interposing the core turnaround portion between the conductive core material and the
conductive core material by using the conductive core material and the conductive core material
as lead wire terminals. The embodiments will be more specifically described with reference to the
drawings. FIG. 1 is a perspective view of an electrode terminal taking out structure for a vibration
sensor according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional
view in the thickness direction taken along line II-II in FIG. . In this embodiment, both sides of the
polymeric piezoelectric material lit are A1. Electrode films 2a and 2b made of vapor deposited
films of Ni, Cr, Au or the like are provided, and as a whole, a piezoelectric element lO forming a
sensor portion of a vibration sensor is formed. One example of the dimensions of the
piezoelectric element IO is 1 ', the length is 25 mm, the width is 5 mm, the thickness is about
0.03 mm, and most of the thickness is piezoelectric n! Each of the electrode films 2a and 2b has a
thickness of about 500. The strip-shaped piezoelectric element 10 is wound around the
conductive core 3 near the end thereof. The conductive core material 3 may be, for example, a
rod-shaped or tubular body of aluminum having a diameter of 0.5 mm, copper, brass or the like,
or a plate-like body made of a similar material having a thickness of 0.3 mm, for example Used.
The band-shaped piezoelectric element 10 is rewound via the core material 3. The piezoelectric
element 10 may have a broken line at the portion 4 to be wound, so the present invention uses
the expression of "rolled back" in the present invention, including the state to be turned back.
The shape to be rewound is used. The unrolling portion 4 of such a piezoelectric element 10 is
sandwiched by the stopper 5 so as to maintain the unrolling state. Rewind 1. After the recumbent
position 4 is swallowed, it is tightened and pinched by narrowing the degree of opening of the
stopper 5. Therefore, the anchor 4 can be deformed by a strong stress, but a weak one is used
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with little or no deformation, for example, a material having high elasticity such as a phosphor
bronze plate or stainless steel is preferably used. Be
When the electrode films 2a and 2b of the piezoelectric element 10 at the rewinding portion 4
are vapor deposited films, the deposited metal may peel off due to the stress at the time of
sandwiching, so a flexible resin film (including rubber) Do. It is preferable that the piezoelectric
element be sandwiched between the wedge member 5 via not shown. Both of the anchor member
5 and the core member 3 are connected to the lead wires 6a and 6b as electrode terminals of the
piezoelectric element 10, and therefore, those having conductivity are used. Therefore, when the
above-mentioned soft resin film is interposed, it is desirable that these also have conductivity, or
at least local contact between the anchor and the like and the electrode film 2a or 2b needs to be
possible. Even if the piezoelectric element 10 is bent at the winding-back portion and the
electrode 2b is broken at that portion, the blocking tool 5 and the core member 3 are both
conductive, so the conduction between the lead wires 6a and 6b and the piezoelectric element 10
is maintained. it can. Further, by adopting such a structure, in the lead-out structure of the
electrode terminal of the piezoelectric element made of a polymer piezoelectric film, since the
lead wires 6a and 6b and the piezoelectric element 10 are not directly connected, the adhesive
force By using a solder that does not melt unless it is larger than the melting point of the
piezoelectric element, and connecting the lead wires 6a and 6b to each of the core material 3 and
the wedge member 5 in advance before the piezoelectric element lO is clamped. S, lead wires can
also be connected firmly. FIG. 3 is a perspective view of a vibration sensor electrode terminal
extraction structure according to another embodiment of the present invention. In this
embodiment, the wedge stopper 5 is made of a plastic or a metal material having relatively poor
elasticity, which is made conductive by attaching a relatively strong vapor-deposited film or AI
foil on the surface, etc. As an example, it has a poor ability to narrow and clamp the opening
angle by its own spring property. In this example, an annular cylindrical body in which a cross
section perpendicular to the axial direction is partially cut off is used as the core 3, and the
vicinity 4 of the end of the piezoelectric element 10 is wound around the core to form a tack
stopper. Attach to 5. After mounting, the wedge 7 is inserted from the end of the core 3, the
diameter of the core 3 is enlarged, and the piezoelectric element 10 is sandwiched between the
core 3 and the stopper 5. Also in this embodiment, the lead wire can be easily and firmly joined
to the wedge by soldering or the like, as compared with the case where the lead wire is directly
joined to the piezoelectric element itself. Although depending on the force, the conductivity
between the wedge member, the piezoelectric element and the core material is secured, and the
same effect as the previous embodiment is obtained.
2) Although the piezoelectric element for the vibration sensor has been described, the present
invention is not limited to the vibration sensor, as is apparent from the above description. For
example, a polymer piezoelectric film is widely used as a pyrosensor, bimorph, etc. It is used for
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the electrode terminal taking out structure of the piezoelectric element which has been 1)
According to the present invention, according to the present invention, the lead wire lead-out
portion is not directly provided on the piezoelectric element, but is held immediately above the
holding secured by conductive spring property or pressure contact force with the piezoelectric
element. Since it is provided, it can be firmly connected by the solder excellent in adhesive force,
and the electrode terminal taking out structure having both good electrical connection and
mechanical durability is provided.
[0002]
Brief description of the drawings
[0003]
1 and 3 are perspective views of an electrode terminal taking out structure according to an
embodiment of the present invention, and FIG. 2 is a schematic sectional view in the thickness
direction cut along the line II-II in FIG. .
l иии Polymer piezoelectric film. 2a, 2b иии Electrode film, 3L 1 и и и Conductive core material, 4 и и и
Rewound portion, 5 @ и и ?, 6a, 6b fist и и и Lead wire, 7 и и и и
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