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DESCRIPTION JPS5612697

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DESCRIPTION JPS5612697
The piezoelectric sounding body Km using a piezoelectric material having flexibility as a
vibrating plate The configuration of the piezoelectric material is a bimorph or an asymmetric
bimorph, and the cross section of the vibrating plate is a wave. A piezoelectric sounding body
characterized in that
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention uses a piezoelectric film or a
piezoelectric thin film as a diaphragm of a sounding body, and has a wide vibration frequency
range, a high sound pressure level, and a piezoelectric sounding body which can be easily
manufactured. A sound generator using a piezoelectric ceramic of pzT $ is widely used as a
buzzer or the like. Also, in recent years, various piezoelectric sounding bodies using polymeric
piezoelectric films such as PVF 2 have been devised. The sound generator using piezoelectric
ceramic is simple in structure but produces only high frequency sound. Low sound is almost
impossible because the element itself is large. The high voltage is necessary for the operation
because it is necessary to make it thin on processing. A sound producing body using a
piezoelectric film can be easily produced, but it is extremely difficult to achieve a practical level
as a sound producing body because the sound pressure level is low because the piezoelectric
performance is inherently low. Conventionally, various measures have been considered to solve
these drawbacks. For example, as shown in FIG. 1, the polarization direction is busy opposite to
the inflection point formed by the piezoelectric film 1 fixed member 2 formed in a wavelike
shape, and the electrodes 3 are provided on the entire surface of the both surfaces to apply
voltage. Be done. In this case, electrode formation is easy but polarization treatment is difficult.
FIG. 2 shows an example in which the polarization directions are aligned. However, in this case,
the electrodes 4 # 'i are separated at the inflection point, and the electrode connections must be
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alternately made. The present invention simplifies and manufactures the conventional complex
configuration such as 9 and completes a piezoelectric sounding body having a wide frequency
range and a high sound pressure EndPage: 1 level. The spirit of the present invention will be
illustrated and described with reference to FIG. w43 is a view for explaining the present
invention. The piezoelectric films 5 and 6 which are opposite to each other in the polarization
direction have a starved and wave-like shape. Although the fulcrum 7 is illustrated in the middle
of the inflection point, this may be omitted. Electrodes 8 and 9 are formed on the surface of the
piezoelectric film 5, 6 and a pressure is applied to the electrodes. This is why (a wide frequency
range with ten configurations and a high sound pressure level sound generator are completed. It
is not necessary to separate the polarization or to separate the electrodes. This principle is due to
the fact that the operation and waveform of the immorph match (7). When a voltage is applied to
expand the piezoelectric film 5 located at the upper side in the figure, the lower piezoelectric film
6 shrinks. This shows the same tendency even when the waveform is shifted by ░ C1. In the
figure, the waved diaphragm positioned above the inflection point 7 operates to expand upward.
On the other hand, the waveform diaphragm located below the inflection point operates to
contract upward.
Thus (direction generated sound pressure even at corrugations of-displacement is the same.
Therefore the sound pressure is very high 2. Further, if the fulcrum of the inflection point is free,
the fulcrum of fulcrum can be freely varied depending on the frequency, and the frequency range
becomes wide. FIG. 4 shows an example in which the polarization directions of the piezoelectric
films 10 and 11 are the same. As in the case of FIG. 3, electrodes are formed on the entire
surface of both surfaces, but another electrode 12 is formed on the piezoelectric film 10 ░ 11. In
order to actually make this, a piezoelectric film having electrodes formed on both sides is
attached to each other, and an electrode between the electrodes is made conductive. With this
structure, the sound pressure can be secured at a low voltage as compared with the conventional
example and FIG. FIG. 5 is a view for explaining an example in which a large number of bimorphs
are further stacked to increase the sound pressure. FIG. 6 is a view for explaining the present
invention in the case of using a piezoelectric thin film. The piezoelectric thin film 14 is formed on
one side of the wavy metal plate 13. Furthermore, an electrode 15 is formed thereon. The
piezoelectric thin film 14 is obtained by evaporating zinc oxide, PZT or the like by sputtering or
ion plating. FIG. 7 is a view for explaining an example using a plurality of piezoelectric thin films.
A piezoelectric thin film M17 ░ 1B is formed on both sides of the corrugated metal plate 16, and
an electrode 19.20 is further formed. In the case of l1116, sound is produced at a low voltage. As
described above with reference to the drawings, the present invention Ij] is a very simple
structure which is easy to manufacture and is a piezoelectric sounding body having a wide
frequency range and a high sound pressure level. This is very useful as a buzzer and speaker,
especially for small portable electronic devices. For small radios, microcassette tape recorders,
small communication devices, electronic watches, etc., it is certain that the value added is
doubled by using the present invention.
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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are diagrams for explaining a
conventional example. FIGS. 3, 4 and 5 illustrate the present invention using a piezoelectric film.
6 and 7 illustrate the present invention using a piezoelectric thin film. 1 ииииии Piezoelectric film 2
иииииииииииииии Material s 5 ?5 ииииииии Electrode 4 ииииии Electrode 5 иииииии Piezoelectric film 6 иии ииииии
Piezoelectric film 7 иииииииииииииииииииии Electrode 9 иииииии Electrode 10 иииииииииииииииииииииииииииииииииииииииииии Piezoelectric
film 12 иииииии Electrode 15 ииииии Metal plate 14 ииииии Piezoelectric thin film 15 ииииии Electrode 16 ииииииии
Wave metal plate 17 ииииии Piezoelectric thin film 18 иии Piezoelectric thin film 19 иииииии Electrode 20 и и
и и и и Applicants Suwa Seikosha Co., Ltd. 6-EndPage: 2 Figure 1 Figure 2 Figure 3 Fig.4 Fig.5 Fig.6
EndPage: ?
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