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JPS5460484

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5460484
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a pressure-type
element constituting a piezoelectric sounding body according to the present invention, FIG. 2 is a
cross-sectional view of an upper case and a lower case, and FIG. 4 is a perspective view of the
lower case after assembly, and FIG. 5 is a cross-sectional view showing another example of the
lower case. 1 ...... metal plate, 2 ...... piezoelectric element, 3 ...... lead, 4 ...... through holes, 5 ......
stepped portion, 6 и и и Upper case, 7 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 10 ░ 10
'-и и и? Step for reinforcement.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
sounding body that emits sound by applying an alternating current signal, the purpose of which
is to be driven by a low current, thin in shape, simple in structure and easy to install. In addition,
it is to provide high sound pressure. Heretofore, there have been many devices that use an
electromagnetic effect, such as a speaker or an electromagnetic buzzer, to generate a sound by
applying an alternating current signal, and the configuration is attached to the diaphragm or
magnetic body of a magnetic body by an electromagnet having a coil wound around a core. The
horn is vibrated to make a sound. Therefore, due to the structure by which the electromagnet is
mounted under the diaphragm, it should be thin! ? = 'h book-field is difficult, and even smaller
ones can not have a' -2 'thickness of less than 10 ?, and the biggest drawback is that the current
is driven by the current to drive the coil. The present invention is a piezoelectric sounding body
that utilizes the t effect of vibrating and producing a sound by applying an AC signal to a
conventionally known piezoelectric element, which has the disadvantage of consuming, and the
configuration is as follows. It has become. First, FIG. 1 shows a piezoelectric member and a
rement for use in the sound generator of the present invention. Reference numeral 1 denotes a
thin metal plate on which an electrode is printed by polarization in the thickness direction with
an adhesive or the like. The piezoelectric element 2 is bonded to form an asymmetric bimorph
structure. Reference numeral 3 denotes a lead wire electrically connected to the electrode of the
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piezoelectric element 2 constituting the element. Then, when an alternating current signal is
applied to both ends of the piezoelectric element 2, a bending vibration is performed to generate
a sound that has become an alternating current signal 1, or when the outer periphery of the
metal plate 1 is mechanically fixed Since the central part vibrates to generate a sound 1), it is
necessary to make the fixing of the element 9 in order to use it without killing the movement of
the piezoelectric element. In the present invention, as shown in FIG. 2, a cap-like upper case 6
having a lower surface opened and a through hole 4 at the center of the upper wall and a step 5
at the inner periphery of the earth wall Upper case 60 step 5 using the lower case 9 и ? ░ 2 ? g
e 5-7 и ? which has the fitting protrusion 7 at the upper peripheral portion 1-and has the
terminal 8 embedded therein. And a lower case 9 and the projection 7 of the lower case 9.
Reference numeral 10 denotes a reinforcing step integrally provided on the upper side of the
terminal embedding portion of the lower case 9. Next, the assembly structure will be described
with reference to FIG. 3 and FIG. 1) After connecting the lead wire 3 of the piezoelectric element
to the terminal 8 of the lower case 9 by soldering etc., fold the terminal 1o into the projection 7
of the lower case 9 and then place the piezoelectric element in the projection 7 The upper case 6
is placed on the upper case 6 and the two cases 6.9 are fixed by bonding or welding, thereby the
outer periphery of the metal plate 1 of the piezoelectric element is the step 5 of the top case 6
and the lower case 9 It is fixed between the projections 7. .
At this time, the reinforcing step 10 is provided in the embedded portion of the terminal 8 so that
the terminal 8 can be reinforced and the terminal can be bent to be a rotation stop at 1 ░ or the
reinforcing step 10 A notch may be provided to the terminal 8 for fixing the terminal 8. In order
to mount this sounding body, it is possible to directly insert 6 to 5 into the printed circuit board.
In addition, a conventional sounding body: C ratio of less than 10 * can be manufactured. And ?
Vibration can be done by simply applying a voltage to the piezoelectric element 2 ? Vibration
(voltage drive type), 5 odBO sound pressure is also possible if there is a voltage of 10 V with a
current under ImAJ1, 1 and 5 As shown in the figure, by providing the reinforcement step 10 'on
the lower side of the lower case 9 so that the sounding body floats from a mount such as a
printed circuit board, the acoustic impedance of the printed circuit board and the sounding body
can be managed. Furthermore, the sound pressure can be increased. Here, in order to cause the
sounding body to float from the mount of the printed circuit board or the like, a protrusion may
be provided on the lower side of the lower case 9. Further, the terminal 8 can be easily connected
by connecting and then connecting the lead wire 3 of the piezoelectric element, and the distance
to the connection portion of the lead wire can be increased even when the sounding body is
soldered to a printed circuit board or the like. The heat resistance of the solder is also excellent
because it can be taken. 15. As described above, the piezoelectric speaker according to the
present invention can be driven by low current and provide high sound pressure 6- ииииииииииииииии It is
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