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JPS57130399

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DESCRIPTION JPS57130399
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional piezoelectric
sounding body, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a sectional view
showing one embodiment of a piezoelectric sounding body according to the present invention, 4
is the same exploded perspective view. 10 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Top Case,
17.17 ? ииииииииииииииииииииииииииииии 20 ░ 20 ? ииииииии External connection terminal (bin for external
terminal), 21.21 ? ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Internal connection terminals
(internal connection) Terminal).
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
piezoelectric speaker in which a piezoelectric buzzer element having a structure in which a thin
piezoelectric ceramic plate is bonded to a diaphragm made of a thin metal plate is housed in a
case. Where it is easy to use, easy to use, low cost)) IG3 //) A)) Qg2 piezoelectric buzzer element
is a piezoelectric ceramic plate when an AC electric field is applied to the piezoelectric ceramic
plate Together with a diaphragm made of a metal plate integrally attached to the expansion and
contraction to generate a sound by deflection vibration, in order to make sound efficiently, the
piezoelectric buzzer element is supported or fixed by an appropriate means There is a need to.
Generally used is a structure for fixing the outer edge of the diaphragm of the piezoelectric
buzzer element around. A conventional structure will be described based on FIGS. 1 and 2. FIG. A
lower gace 1 has a sound emission hole 2 in the bottom and a step 3 in the periphery and is
made of plastic or the like. A piezoelectric buzzer element 4 has a thin piezoelectric ceramic plate
6 bonded to a thin diaphragm 6 such as a metal plate. The lead wire 7 is electrically connected to
both electrodes of the piezoelectric ceramic plate 6. In many cases, one side of the lead wire 7 is
electrically connected directly from the electrode of the piezoelectric ceramic plate 6 and the
other side is electrically 9 mechanically connected through the diaphragm 6. In general, the lead
wire 7 is connected by soldering. In this embodiment, although there are two lead wires, in some
cases, the electrodes are provided on the electrodes of the piezoelectric ceramic plate 6, and
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three lead wires are used for self-oscillation circuit-))) 10383 path used. The upper case 8 is an
upper case made of plastic or the like which has a convex portion 9 and is made to fit well with
the lower case 1. The outer peripheral portion of the diaphragm 6 of the buzzer element 4 is
sandwiched and fixed. An adhesive such as epoxy resin is mainly used for this fixation. In this
way, a piezoelectric sounding body can be produced. When this sounding body has a terminal
structure, a terminal is attached to the upper case 8 and the lead wire 7 is internally connected
by soldering or the like to form a terminal structure. Although such a sounding body is a general
structure, it takes time for the process since an adhesive is used for assembly, assembly tools and
the like are required, and in order to make a terminal structure, it is necessary to the upper case.
It is difficult to reduce the cost, such as the installation of terminals and four or more connection
points in internal wiring, and a large cost reduction is difficult. The present invention has been
made to eliminate the above-mentioned conventional drawbacks, and proposes a piezoelectric
sounding body capable of achieving a large cost reduction system. An embodiment of the present
invention will be described with reference to FIGS. 3 and 4.
In the figure, 1o is a lower case having a sound emission hole 11 provided on the bottom surface
and a stepped portion 12 provided on the periphery, and 2 m13 of plastic thermal equal force is
a thin piezoelectric ceramic plate 15 having a larger area than that! ?????????
?????????????????????????????? A piezoelectric buzzer
element. Reference numeral 16 denotes an upper case made of plastic or the like which has been
cut at its central portion, and its periphery is made to fit well with the step 12 of the lower case
10 described above. 17 and 17 'are metal plates made of springy material IJ. , And the upper
case 16 with the supporting pieces 18, 18 'and 19119' formed in a U-shape. The outer edge
portion of the diaphragm 14 constituting the piezoelectric buzzer element 13 is held between the
lower case 1o, and both the cases 10.16 are fixed while being pressurized with springiness so as
to be integrated. On the other hand, external terminal bins 20.20 'and internal connection
terminals 21.21' extend outward and inward from both cases 10.16 to the clips 17 and 17 '! It is
integrally provided in a structure that is unique. ??????????????? The internal
connection terminals 21. 21 'of 5 ?: 17 and 1-r' are electrically connected to the electrode
surface of the piezoelectric ceramic plate 15 and the diaphragm 14, respectively. Here, the
connection point can be contact alone or soldering. As described above, the present invention is
configured, and no adhesive is required for producing the piezoelectric sounding body, and the
clean knob is an external connection terminal, an internal connection terminal, and the like. The
lower case is fixed, the outer periphery of the piezoelectric buzzer element is fixed, and the
versatile function is achieved, and the structure is simple, which enables a large cost reduction.
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