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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are a perspective view and a front view
of a piezoelectric buzzer according to the prior art, and FIGS. 211a and 211b are a perspective
view and a sectional view of the piezoelectric buzzer according to an embodiment of the present
invention. It is a front view. 3 · · · · · Piezoelectric element, 4 · · · · · · · · · · · · · ·
DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to provide a
piezoelectric buzzer with a low resonant frequency using diaphragms of the same outer diameter.
An example of a conventional piezoelectric buzzer is shown in FIGS. 1a and 1b. That is, the thin
piezoelectric ceramic plate 1 is a thin flat metal vibration or the like, that is, a laminated <m>. The
resonant frequency of this piezoelectric buzzer is inversely proportional to the square of the
diameter of the diaphragm 2 and is a ratio to the thickness of the diaphragm 2. This piezoelectric
buzzer is attached to a support by appropriate means and electrically By applying a signal to the
piezoelectric element 1, a flexural vibration is caused to generate a sound. The magnitude of this
sound becomes larger as the electric signal from the outside Z 乞 Z3 unit 22 is brought closer to
the vibration frequency. In order to make the sound louder, it is common to use a frequency near
the resonance point. However, the resonance point of the piezoelectric buzzer is generally quite
high as several K) Iz, and a metallic electronic noise is generated. Therefore, various efforts have
been made to obtain a slightly lower frequency with a pleasant ear, and the resonance frequency
is lowered by thinning the piezoelectric element 1 and the diaphragm 2 or increasing the
external sound of the diaphragm. However, reducing the thickness is limited in terms of
mechanical strength, and increasing the diameter has the disadvantage of taking up space on the
use side. For example, in the case of a piezoelectric φ 60 of φ 60 in which a 0.1 eclipse
piezoelectric element is bonded to a 0.1 + metal plate, the resonance point is 1.2 KHz, or more)
increasing or decreasing the outer diameter or thickness It is also technically difficult.
Accordingly, it is an object of the present invention to reduce the resonance frequency with the
same outer diameter, and an embodiment of the present invention will be described below with
reference to FIG. In the first drawing, 3 is a thin plate-like piezoelectric element, and 4 is a
diaphragm made of 3 thin metal plastic or the like. The vibrating plate 4 is flat at a portion where
the piezoelectric element 3 at the center is bonded, and its outer periphery is provided with
concavities and convexities concentrically from the center as at 6. In this way it is possible to
achieve the same effect as increasing the equally saving outer diameter of the diaphragm and to
significantly lower the resonant frequency. For example, it is possible to reduce the resonance
frequency by about 30% by inserting three concentric irregularities at the height of o and sis. As
described above, according to the present invention, the resonance frequency can be lowered by
devising only the shape of the diaphragm using the piezoelectric elements having the same outer
diameter and the same thickness.
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