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JPS53146370

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DESCRIPTION JPS53146370
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a piezoelectric buzzer according to an
embodiment of the present invention, in which JA is a plan view, B is a cross-sectional front view,
and C is an enlarged cross-sectional view of the main part of FIG. FIG. 2 shows another
embodiment of the present invention, and is an enlarged view showing a section corresponding
to FIG. 1 CIC. 1 · · · Case main body, 1a · · · · · · · insert portion 1b · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Case lid, 2a · · · · · · countersunk portion, 2b · · · · · ·
circumferential groove, 2c · · · · · · groin, 3, ..., ... circular bimorph vibrator.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure type
buzzer using a circular bimorph oscillator as a sound generator. The following will describe an
example # 1 of one surface. In FIG. 1, a case cover 1 is a cylindrical case main body, and a case
cover made of a flexible material such as a synthetic resin having a plurality of sound emitting
members d mounted on the upper surface thereof and covered with a plurality of sound emission
members d on the upper surface. 3 is a circular bimorph oscillator in which the piezoelectric
element 3b smaller than (t) is concentrically attached to one side of the gold pJ 桧 3a, and the
outer periphery of the gold 1NIJ & is described later so as to accelerate the bending vibration. Is
held by means of The oscillation circuit element incorporated in the case main body is a pair of
lead wires to the bimorph oscillator 3! The drive signal is provided through Jib. According to the
present invention, in the configuration of the upper one, the upper F and the fitting portion / a
are provided on the upper part of the case main body l, the peripheral protrusion / b and the
outer piece edge of the circular bimorph oscillator 3 in the fitting portion / a Of the bottom of the
case lid and the bottom of the case lid is a deep-seated seat part-coat at-inserted into the bottom
of the case lid, and the inner periphery of the seat gutter portion 2a It is a feature that it
comprises a crotch seat 2C, which swings around the circular bimorph oscillator 3 supported at
the rim / C of the insertion portion / a, and the circumference b coinciding with the projection /
b. In this case, as shown by the number 6, by resiliently contacting the circular bimorph vibrator
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30III side with the crotch seat 2C of the case 旦 with elastic ring such as rubber, by elastic
contact with 0) lip / C of the case main body, Tension is applied to the bimorph oscillator 3 to
advantageously increase the sound pressure. According to the piezoelectric buzzer of the present
invention having such a configuration, when the circumference of the circular bimorph oscillator
is supported by the mouth l # of the case main body, the circular bimorph vibration with respect
to the case main body can be obtained simply by interposing the case lid from above. In order to
hold the rim of the baby and the crown of the case lid simultaneously, the outer periphery of the
circular bimorph oscillator is supported on the wedge-shaped projecting piece formed on the
inner surface of the case body and fixed by adhesive etc. As compared with the conventional one
which is mounted on the case main body, there is a great effect that the assembly is very easy,
the potash is small, and the inexpensive and inexpensive one can be obtained. In addition, as
illustrated in FIG. 2, the case main body O mouth edge lCK has a counterbore surface / C at a
shallow bottom, and the outer peripheral edge of the circular bimorph oscillator 3 is inserted into
this to temporarily hold it. There is an advantage that it is possible to further improve the
sticking property and to prevent the eccentricity of the vibrator. (J)
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