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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an embodiment
according to the present invention. FIG. 2 is also a sectional view of another embodiment. FIG. 3
is also a sectional view of another embodiment. 1a, 1b: electrode, 2, 2a, 2b: piezoelectric polymer
film, 3ay 3b: elastomer film. Many first one second one-175-real opening 49-132774 (2) / / '' / /
· · · ·. '乙. ・.:. ・... ・..:. ・.. ... . / <S,))) 冫)> 冫 冫>) 1π → /. ・.,.. . 4
one D. /? La 冫 3α 2 Q 3 b shadow δ 圀 1-176-
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to elements that
convert mechanical signals, such as pressure, impact forces, etc., into electrical signals.
Conventionally, as piezoelectric conversion elements of this type, plate-like, rod-like or bimorphlike piezoelectric materials such as quartz crystal, Rochelle salt, barium titanate, zircon and lead
titanate have been used. The rod-like structure of the ceramic piezoelectric body is adopted for
the electromechanical conversion of the pressure and the impact force, and the piezoelectric
ignition element as the application thereof is a well known place Q). However, the pressure or
impact force applied perpendicularly to the plate surface and the film surface is converted to an
electric force by the plate-like or film-like formed using the piezoelectric material. It is difficult.
The reason is that all the above-mentioned piezoelectric materials are hard and easily broken
against the two bending stresses. In order to correct the above-mentioned problems, a
piezoelectric material having large compliance and good processability is provided. For example,
piezoelectric polymer films such as polyvinylidene fluoride, polyvinyl fluoride, polyvinyl chloride,
etc., their compliance is 10 (m) compared to 10-10 ['m "' / N] of conventional piezoelectric
materials.曾 / N] and 2 digits or more are large. Therefore, using this piezoelectric polymer film
makes it easy to detect the pressure and impact force on the six surfaces without breaking it, but
it is not easy to adopt only a single piezoelectric polymer film. There is. That is, on the other
hand, the polymer film is likely to be plastically deformed. (2) The strong concentrated stress has
a drawback that it can not stand small. The present invention solves the above problem-1 by
pasting together a piezoelectric polymer film and an elastomer film such as rubber, and enables
detection of local stress and impact force applied on nine surfaces, which rubber has The nature
of stress diffusion and bulk compliance were achieved for the first time in combination with the
piezoelectric properties of the piezoelectric polymer film. By selecting the elastic modulus and
thickness of rubber appropriately, adjustment of the detection range according to the magnitude
of the pressure and impact force applied to one surface is also possible. The shape of the electromechanical transducer may be any shape, rectangular or circular. An embodiment of the present
invention will now be described with reference to the drawings. FIG. 1 shows an end of a
piezoelectric polymer film 2 having electrodes 1a and 1b and an elastomeric film 3 made of
rubber. It is fixed and supported. In this case, the stress applied to the elastomer @ 3 acts as a
tension, and an electrical output according to the piezoelectric constant g31 (3) or g3 □ of the
piezoelectric polymer film 2 is obtained.
FIG. 2 shows another embodiment in which the end of the piezoelectric polymer film 2 having
the electrodes 1a and 1b is held and adhered by a pair of rubber-like elastomer films 3a and 3b.
FIG. 3 also shows another embodiment, in which a pair of piezoelectric polymer films 2a and 2b
are bonded so that their polarization directions are symmetrical to each other, they are held and
adhered by rubber like elastomer films 3a and 3b. The end of the object is fixed and supported.
At this time, external noise is prevented from mixing by electrically grounding both outer
surfaces of the pair of piezoelectric polymer films 2a and 2b bonded to each other. If an
electroconductive rubber such as chloroprene rubber mixed with carbon is used as the elastomer
film, it can also serve as the electrode of the FE electrode. As described above, the
electromechanical variable element according to the present invention is very useful and
effective for detecting the pressure applied to the nine surfaces, the local stress, and the like.
Moreover, the caloric nature and flexibility of the conversion element by this invention. If the
impact resistance is used, new applications that can not be found in the past can be expected.
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