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JPS5584689

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DESCRIPTION JPS5584689
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view and a front view of a piezoelectric
buzzer element according to the prior art, FIG. 2 is a cross-sectional view showing a vibration
mode when the diaphragm peripheral fixing is used, FIG. FIG. 4 is a top view and a front view
showing an embodiment of the piezoelectric buzzer element according to the present invention,
FIG. 4 is a cross-sectional view showing a vibration mode during fixed use around the diaphragm,
and FIG. Is a characteristic diagram showing the relationship between the frequency and the
sound pressure. 1 '..... Metal diaphragm, 2 ..... Piezoelectric magnetic element.
DETAILED DESCRIPTION OF THE INVENTION It is an object of the present invention to provide a
piezoelectric buzzer element having good sound 8E characteristics even with a small input signal
when fixedly used around the metal diaphragm. Generally, a piezoelectric buzzer element having
a structure in which a piezoelectric ceramic element 2 is bonded to a metal diaphragm 1 with an
adhesive or the like as shown in FIG. When the vibration mode is shown in FIG. 2, the periphery
of the diaphragm 1 is fixed in the resonance box 3 and a large input signal is required. In Fig. 14, 2 shows the vibration amplitude. − :) 1, n ··· rc I ′ ′ 1 / · r: 2 ··· The present invention
proposes a Senden buzzer element with a small input signal and a good sound pressure
characteristic, The third embodiment of the present invention will be described with the same
reference numeral as in the above with reference to FIG. As shown in the figure, the present
invention has a structure in which a piezoelectric ceramic element 2 is bonded with an adhesive
or the like to a metal diaphragm 1 whose peripheral portion is thinner than the center. Such a
configuration Q generates a larger vibration amplitude 4. Further, FIG. 5 shows the relationship
between the frequency and the sound pressure of the product a of the present invention and the
conventional product, and the product of the present invention a has better characteristics. As
described above, in the piezoelectric buzzer element of the present invention, by making the
peripheral portion of the metal diaphragm thinner than the central portion, a large vibration
amplitude is generated with a small input signal, and good sound pressure characteristics can be
04-05-2019
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obtained. It is.
04-05-2019
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