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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the piezoelectric buzzer
according to the present invention, and FIG. 1A is a side view of the main part in cross section,
FIG. 1B is a bottom view, and FIG. It is a longitudinal cross-sectional view. DESCRIPTION OF
SYMBOLS 1 ... Piezoelectric element, 2 ... Acoustic box, 2a ... Small protrusion, 3 ... Printed wiring
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer in which a piezoelectric element is adhered and an acoustic box is formed on a printed
wiring board with a resonance plate. The embodiment of the present invention will be described
below. In FIG. 1, l denotes a plate-like piezoelectric element made of a lead zirconate titanatebased compound polarized to form a silver-burned metallized electrode surface (not shown) on
an amphibian surface and to exhibit thickness oscillation. The bottom is a cylindrical acoustic
shaft with a mosquito piezoelectric element attached to the top inner surface and made of a thin
plate of round metal or synthetic resin and doubles as a resonance plate, with a hole on the top
and a printed wiring board from the side wall (1) 3 Small holes (not shown) K are fitted and
soldered, fixed number of small thin projections 2b fixed by an adhesive or the like. As shown in
FIG. 2, a piezoelectric vibrator and a resonance plate are conventionally used, and a piezoelectric
buzzer as shown in FIG. 4 (c was held in contact with both end faces of the lid 14L provided with
a and had a conical vertical cross-sectional shape, and the lid / 4A 4 I was operated as an
acoustic box. In addition to requiring high precision in the dimensions of the conical joint, not
only a large number of man-hours are required for assembly but also the drawback of increasing
the size of the device can not be avoided, and 9 is a pressure source which becomes a sound
source in the present invention. Since the resonant plate to which the element is attached is
directly fixed on the printed wiring board as a bottomed cylindrical acoustic plate, it is not a tiger
that solves the above-mentioned drawbacks in the conventional piezoelectric buzzer, but it has a
great effect of significantly downsizing . In the embodiment of the drawing, the sound hole!
Although a may be formed on the surface of the acoustic 42OIJi, it may be formed in a printed
wiring board (2), or it may be attached to the inner surface of the top of the acoustic box and the
piezoelectric element may be provided on the outer surface (upper side) of the top. Good.
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