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JPS5647599

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DESCRIPTION JPS5647599
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the basic mode of the piezoelectric buzzer
of the present invention, FIG. 1A is a longitudinal sectional view, FIG. 1B is a top view, and FIG. 2
is a longitudinal sectional view showing another embodiment. is there. 1.11: piezoelectric
vibrator, 1a: electrostrictive element, lb. 11b: Resonant plate 2. Outer casing 2a: base 2b: lid ,
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer using as a sound source a piezoelectric image pickup element in which a plate-like
piezoelectric element is adhered to a resonance plate and housed inside an outer casing. FIG. 1 is
an embodiment showing a basic aspect of the piezoelectric buzzer of the present invention, in
which l is a silver-baked metallized electrode surface (not shown) formed on both surfaces and
polarized to exhibit vibration in the thickness direction. A piezoelectric element / a made of a
lead zirconate titanate-based compound and a mosquito piezoelectric element are adhered with
an adhesive, and the round metal i9 is a synthetic tree (1) // 7. '? Piezoelectric vibrators that
serve as sound sources from a thin plate of gauze thin film (resonator plate / b), a base body
made of synthetic resin or the like, and a lid that becomes an acoustic box by plating on the
upper end face and the lower end face of the base In the case of both body and lid, both the base
body a and the cover body b are universally supported), and in the fitting face thereof, hold the
resonance plate / b of the upper piezoelectric vibrator at its outer shoulder portion As described
above, the fitting surfaces of the both are fitted in a pyramidal cross-sectional shape and are
formed in the inner part i @ of the base body a, and the resonance plate / b is dust chambered in
the ninth stage drawing. Piezoelectric elements used for piezoelectric vibrators of this type are
largely thinned during sintering, for example, in the case of lead zirconate titanate based
ceramics widely used widely, As a result, it is difficult to obtain a uniform, complete bond layer 1
to the joint [ml to K] which produces thickness, width (different from the relationship extending
to the radius, respectively), and distortion to the right. Since the main surface of the piezoelectric
element to be combined with the resonance plate K11 is polished to be smoothed, the
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piezoelectric element of Sueto is formed into a square or circular flat plate and it is difficult to
obtain an accurate rubbing image. Nine. On the other hand, in the present invention, the
piezoelectric element is formed into an annular shape, and it is possible to securely bond to the
resonance plate with a uniform adhesive layer by a desired accurate polishing surface which is
easy to polish from 9. Next, FIG. 2 shows another embodiment in which common parts are
indicated by the same reference numerals, and a piezoelectric vibrator which is held and fixed by
holding crotch seats on the upper and lower end faces of the base 1 and the lid 2b in contact. A
protrusion // l) 'for positioning the wedge piezoelectric element at the center of the resonance
plate by engaging with the inner diameter surface / a' of the resonance plate / lbK annular
piezoelectric element / a. The formation of K is a turtle that exerts a remarkable effect that can
be easily and accurately positioned together with a firm joint to the resonance plate described
above. The shape of the inner and outer diameters of the piezoelectric element is preferably an
annular shape of concentric circles in terms of performance, but the outer diameter is preferably
a polygonal shape with the outer and inner diameters being%. Further, although not shown, as a
modification of FIG. 2, a protrusion of the resonance plate may be provided on the upper side
opposite to that of FIG. 2 and engaged with the outer diameter of the piezoelectric element.
(3)
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