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The present invention relates to a polymeric piezoelectric material or a polymeric material and a
piezoelectric lia! The present invention relates to an electroacoustic transducing WMK using a
composite piezoelectric material of the G material with a fine powder (hereinafter collectively
referred to as a piezoelectric film). Heretofore, this type of electro-acoustic transducer has a
structure in which a piezoelectric film is attached to a vibrating substrate such as plastic-), but it
is softer and elastic modulus than piezoelectric film ? piezoelectric ias ?. Since it is about 1/3 o,
it is necessary to give a large displacement to the piezoelectric film to obtain highly sensitive
electroacoustic conversion vs, but the displacement is controlled by the elastic modulus of the
vibrating substrate and sufficient displacement is There is a long point that can not be obtained
nine. The present invention eliminates the above-mentioned drawbacks by providing a vibration
transmitter between the vibrator and the piezoelectric film, and provides a highly sensitive
electroacoustic transducer. Next, embodiments of the present invention will be described with
reference to the drawings. In the first embodiment of the present invention, the vibration body 2
is attached to the acoustically opaque container 1 in the first embodiment of the present
invention, and a vibration transmission body 3.3 't- shaped like a < Is sharpened to contact or
press the piezoelectric film 4.4 'fixed to the container 1. Next, the principle of operation will be
described. The electro-acoustic transducer of the present invention is capable of converting
electricity to sound and converting sound to electricity, and Ih3? Although it has so-called
reversibility, the case of conversion from sound to electricity will be described below. In FIG. 1,
the sound wave that has reached the vibrating body 2 is converted into mechanical energy by the
vibrating body 2, and the piezoelectric film 4.4 'is displaced through the' <'-shaped vibration
transmitting body 3, 3' to internal stress. generate. A voltage is generated in the piezoelectric
films 4, 4 'in proportion to the internal stress, and an output voltage in proportion to the sound
wave reached at the electrical terminals 5-6.5'-6' is obtained. Further, as shown in FIG. 2, the
length of one side of the vibration transfer body 3 is L, and the joint of the vibration -2 and the
vibration transfer body 3 is y. The direction is represented by the y-axis, the junction of the
vibration transmitter 3 and the piezoelectric film 4 is represented by xo, and the direction is
represented by the X-axis. ???? Assuming that the x00 displacement is ?X when the
displacement of ? is ?y, the change of ?X with respect to ?y is expressed by the following
equation, and y == L shows the maximum rate of change. Therefore, it is more effective that the
vibration transmitter 3 is in the shape of a letter "K" of an angle. FIG. 3 shows a second
embodiment of the present invention in which a vibrating body 2 is attached to an acoustically
opaque container 1 by WiLp, and a "moon-shaped vibration transmitting body 7 is provided. And
a structure in which the piezoelectric film 4 fixed to the container 1 is in contact with or spreadpressed.
In the above description, an embodiment of single-sided radiation has been shown, but if it is
desired to obtain the same directivity sensitivity on the front and back, the vibrators 2 may be
provided symmetrically on the front and back. In the present embodiment, the case where one
piezoelectric film is used is described. However, two or more piezoelectric films may be
connected in series or in parallel. As described above, according to the present invention, by
providing the vibration transfer body between the vibrating body and the piezoelectric film, a
sufficient internal stress can be generated in the piezoelectric film by 7 and thus a highly
sensitive electroacoustic transducer can be obtained. it can.
Brief description of the drawings
FIG. 1 is an explanatory view of the first embodiment of the present invention, and is a crosssectional view cut by a straight surface of the acoustic surface K11i, FIG. 2 is an explanatory view
showing the movement of the vibration transmitter, and FIG. It is explanatory drawing of a 2nd
Example, and is sectional drawing cut by a surface perpendicular | vertical to an acoustic surface.
1 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Piezoelectric 7 (Lum, 41 иии иии Piezoelectric film, 5 ...... electrode
terminal 51 ...... electrode terminal, 6 ...... electrode terminal, 61 ... ... electrode terminal, 7 ......
vibration transmission body. V 1 @ ? 2 @
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