JPS56137599

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DESCRIPTION JPS56137599
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view and a front view of a piezoelectric
sheet according to the prior art, and FIG. 2 is an embodiment of a diaphragm constituting a
piezoelectric buzzer element according to the present invention. FIG. 3B is a top view and a front
view of a piezoelectric buzzer element using the same diaphragm, FIG. 4 is a top view showing a
diaphragm according to another embodiment of the present invention, and FIG. 6A and 6B are
characteristic diagrams showing the relationship between the frequency and the sound pressure
of the product of the present invention and the conventional product. 3 ··· Nonmetallic thin plate,
4, 4 ′ ··· Conductive material, 5 ··· Diaphragm, 6 ··· Piezoelectric ceramic element.
DETAILED DESCRIPTION OF THE INVENTION The present invention aims to provide a
piezoelectric buzzer element having a good sweat pressure characteristic 1 even with an input
signal at 60 Hz to 20 kHz 1 when used by fixing the periphery of a diaphragm. 1, generally, use a
piezoelectric buzzer element with a structure in which the piezoelectric ceramic element 2 is
bonded to the metal diaphragm 1 with an adhesive 41 or the like as shown in FIG. When trying
to obtain a good sound pressure characteristic with a human power signal from 0 to 10 kHz, the
diaphragm 1 and ···· 6? (2) It is necessary to make the outer diameter of the electromagnetic
element 2 extremely large or small, and there are problems in practical use. The present
invention is intended to provide a piezoelectric buzzer element having good pressure
characteristics even with an input signal of 60 Hz to 20 kHz when fixed around the diaphragm
and used. As shown in the example of FIG. 2 and FIG. 3 at 9 of the present invention, the
diaphragm 5 is electrically conductive in the portion where the piezoelectric ceramic element 6 is
attached to the thin plate 3 made of nonmetal and in the periphery. It has a structure in which
the elastic material 4 is applied, and has a structure in which the piezoelectric ceramic device 6 is
bonded to the vibrating plate 5. FIGS. 4 and 5 show another embodiment of the present
invention, which differs from the above embodiment in that the entire periphery is provided with
a 'conductive i' and a 'contribute' 4 '. FIG. 6 shows the relationship between the frequency and
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the sound pressure of the product A and the conventional product B, and the product A shows
better characteristics. In this way, the piezoelectric buzzer element of the present invention has
50 diaphragms to 50 Hz by having three diaphragms in which a conductive material is applied to
at least a part of the portion where the piezoelectric ceramic element is to be attached and the
periphery to a nonmetallic thin plate The input at kilohertz 1 is something you can get a good
one thousand one on the issue.
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