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The present invention relates to a low frequency transducer using a polymeric piezoelectric
material. Conventionally, the low frequency transducer is used in the cell 1. Glue a mass such as
metal with a cross-sectional area larger than the cross-sectional area of ceramic on both sides of
this or one or both! Many composite type vibrators are used, in which a bolt gap is tightened. The
reason for this is to avoid enlarging the shape when trying to lower the resonant frequency of the
company's vibrator. That is, if the vibration principle is expressed in a lumped constant, the
stiffness of the ceramic portion is reduced to reduce the size by attaching a large mass to both
ends. However, there is a limit to miniaturization at a level i in which it is reduced to ten due to
the difficulty of manufacturing and assembling parts. The present invention uses a polymer
piezoelectric material whose stiffness is lower than that of ceramic or ceramic, and a compact
transducer is proposed by proposing a structure whose stiffness between masses is the same as
that of the structure. It is provided. A feature of the present invention is a structure in which
pressure is applied to both ends or the periphery of a polymer piezoelectric material (a
composite vibrator attached with a mass from outside with a rubber, a resin, or a liquid filled in a
case). Next, the embodiment of the present invention will be described in comparison with the
conventional one. FIG. 1 is a cross-sectional view showing a conventional transducer of this type.
1 is a cylindrical ceramic vibrator (hereinafter referred to as ceramic) 1-1 and 1-2 are electrodes,
and 2 is a mass. 3 is a bolt for tightening both masses to the vibrator, 4 is an electric terminal,
and 5 is a case. Reasons for thinning the thickness of ceramic company As mentioned above, 0
tightening is to add pre-compression to prevent the bond between the ceramic and the ceramic
and mass from peeling due to vibrational displacement. belongs to. Therefore, when vibrating,
the bolt also vibrates with the ceramic. Next, the first embodiment of the present invention will
be described with reference to the sectional view shown in FIG. 7 is an inner case, 8 wire rubber,
9 is a rubber holding frame. 10 is a screw, 11 is an acoustically transparent outer case made of a
material such as PRP, 12 is air in the inner case, 13 is a liquid such as oil (or water). Considering
the resonant frequency 9 in such a structure. The stay 7 (Young's modulus) of the polymeric
piezoelectric material is about 3 О 1 G ? и dyne, and is less than or equal to ^ as compared with
the stiffness of about 65 О 10 ? ? dyn @ / c?. Accordingly, since 9 is proportional to the
square root of stiffness, it is approximately 7 in the conventional external dimensions. That is, in
order to obtain a predetermined fo, it is sufficient to have a size of approximately one.
Next, the separation preventing structure at the time of vibration between the polymer
piezoelectric body 6 and the polymer piezoelectric body 6 and 172 is explained. The radiating
surface of one mass is applied to the rubber 8 and covered with the inner case 7 and further
outside Is covered with an outer case 11 filled with liquid 13. The external case 11 and the liquid
13 are different from bolts in the conventional tightening and have a low stiffness so that the
effect of increasing the vibrator f is small. Next, referring to FIG. 3 showing a plan view of the
second embodiment of the present invention, the hatched 6 is on both sides. At this time, an
insulating film 16 is interposed between each layer in order to avoid shorting of both electrodes.
The fan-shaped mass 2 is cylindrically bonded to the outside, and further. The small inner
diameter rubber cylinder No. 15 of the outside is expanded and covered. In this case, the force to
clamp the mass 2 to the polymeric piezoelectric body 6 utilizes the contraction force of the
rubber 15. Since the stiffness of the rubber is small and does not have an effect to increase the
resonance frequency O By adopting such a structure i1, a low frequency resonance type
transmitter can be obtained which can be expanded and contracted uniformly in the radial
direction. According to the present invention, as described above, by configuring the polymer
piezoelectric material and the mass to be clamped with rubber or the like, a sill-shaped low
frequency transducer can be obtained.
Brief description of the drawings
FIG. 1 is a sectional view showing an example of a conventional transducer, FIG. 2 is a sectional
view showing a first embodiment of the present invention, and FIG. 3 is a plan view showing a
second embodiment of the present invention. is there.
1 иииииииии Ceramic vibrator, 2 ░ иииии Mass 3-- Tightening is bolt 4-,-1 terminal, 5 иии-Case, 6 и-0 и и
Polymer piezoelectric, 6-1.6-2 и и и и и и и и и и и и и и и и и inner case, 8.15 и и и и и и и и и и, 9----one
suppression Frame, 10 ииииииииииииииииииииииииииии Outer case, 12----one air. 13----liquid, 14 ..-cylindrical core,
16--insulation Fig. 3-553-
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