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JPS5645894

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DESCRIPTION JPS5645894
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a
piezoelectric buzzer according to the present invention, and FIG. 2 is a longitudinal sectional view
of an essential part showing another embodiment. 1 ··· Piezoelectric element, 2 ··· · · · · · · · · · · · · · · ·
· · · Printed wiring board, 3b · · · · · · opening.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer in which a plate-like piezoelectric element is attached to an opening provided in a printed
circuit board on which circuit elements are provided, and a nine-resonance plate is engaged and
danced. Now, an embodiment of the drawings will be described below. In FIG. 1, 1 denotes a
plate-like piezoelectric element made of a lead zirconate titanate-based compound polarized in
the thickness direction with a metallized electrode surface (not shown) formed on the amphibian
surface by silver baking or the like; Resonant plate made of thin film of metal or synthetic resin
with elements bonded by adhesive agent, 3 is made of synthetic resin, and conducts with desired
transmission circuit support (not shown), and the piezoelectric element I and the resonance plate
co and lead (1) In the printed wiring board provided with the metallized conductive portions 3a
and J @ 'connected in the I5P zone, the outer peripheral portion of the resonant plate is vibrated
so as to freely vibrate the central portion thereof. An opening 3b to be attached is formed by an
adhesive. ! Is a shell of a synthetic resin forming an acoustic box above the piezoelectric element
and the resonant plate, and ja is a sound hole of the synthetic resin. Next, FIG. 2 shows parts
common to FIG. 1 with the same reference numerals and in nine other embodiments, a resonance
plate to be a sound source having a piezoelectric element attached thereto is a bottomed
cylindrical body l- and its side wall l co An embodiment in which a is press-fit or bonded on the
inner peripheral surface 3'b 'of the opening 3b of the printed wiring board is shown. In this type
of piezoelectric buzzer, the outer peripheral portion of the resonance plate is held between the
bottom and the opposite end surfaces of a pair of bottomed cylindrical outer shells as in the case
of l1il u and the both end surfaces of the outer rings are fitted. Since it has become so, it is
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impossible to avoid large size by requiring only one jacket with high dimensional accuracy. On
the other hand, in the piezoelectric buzzer of the present invention, the plate-like (the
piezoelectric element is attached and the nine resonance plate is engaged and sealed in the
opening provided in the printed wiring board on which the transmitting Since the abovementioned resonance plate is directly held by the printed wiring board on the outer peripheral
portion thereof, only one piezoelectric element and one piezoelectric plate disposed above the
resonance plate are sufficient to improve mass productivity and overall height. There is an
excellent effect of shortening the
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