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TECHNICAL FIELD The present invention relates to a piezoelectric speaker. The pressure IlL type
sounding body according to the present invention is mainly used for various small portable
electronic devices such as a thin radio and a digital watch with a buzzer. There are various
conventional wiping methods using the prior art and interdigital piezoelectric ceramic material as
an audio sound element. For example, a piezoelectric pickup or a piezoelectric microphone
applying a bimorph structure by laminating two thin pressure% porcelain materials, and applying
a piezoelectric ceramic material concentrically to a metal disk to form an asymmetric disk
bimorph structure and Piezoelectric Bude-Pi is an application of the above. Although these
applied products are used in small portable devices of each type, it is not clear that the devices
tend to be increasingly smaller and lighter as the trend of the times, and accordingly, along with
this tendency, the smaller size of piezoelectric applied products Weight reduction has also been
strongly demanded. As the sounding body using piezoelectric ceramic material, that is, the
piezoelectric sounding body has a well-known structure using a magnetic circuit, there is no need
to worry about the influence of the external leakage magnetic field at all, so it is widely used It
has been used, but as mentioned above, there is a demand for integration and hybridization of
parts along with the reduction in size and weight of the equipment. Along with this, there is a
strong demand for the need for integration and hybridization of piezoelectric sounding bodies It
has been. It goes without saying that it is necessary to use a lift circuit as a drive circuit to drive
the pressure type II sounding body, but the products currently on the market are equipped with a
self-excitation type equipped with an oscillator circuit and an oscillator circuit. Not classified
separately The separately excited type is a system in which a signal is input and driven by an
external oscillator, but the self-excited piezoelectric type sounding body has a structure in which
a vibrating portion, a piezoelectric material, and an oscillating circuit portion are incorporated in
one package. This is a major obstacle to incorporation into small-sized equipment. SUMMARY OF
THE INVENTION In view of the above problems, the object of the present invention is based on
the idea that in a self-excited piezoelectric type sounding body, an excavated circuit is directly
mounted on a diaphragm, pressure 1i! It is an object of the present invention to provide an
integrated, hybridized piezoelectric type sounding body which makes it possible to reduce the
whole of the type sounding body to about 1/10 of the conventional thickness. The object of the
present invention is to provide a piezoelectric ceramic material having a pressure-type ceramic
material, wherein the piezoelectric ceramic material is formed into a flat plate shape and the
electrodes are baked on both sides, and one of the piezoelectric ceramic materials. A piezoelectric
sounding body comprising: a diaphragm adhered on 1fft of a surface; and an oscillation circuit
mounted on the diaphragm and connected to the electrode at a predetermined position. Is
achieved by
Embodiment 1 FIGS. 1 (a) and 1 (b) are a plan view of a piezoelectric speaker according to an
embodiment of the present invention and a sectional view taken along the line A-A '. In the figure,
1 is a piezoelectric ceramic material (piezoelectric body), 2 is a counter electrode, 3 is a split
electrode & electrode, a counter electrode comprising a main electrode and a lead electrode, 4 is
a diaphragm, and 5 is an oscillation circuit as a drive circuit. . 2 and 3 show a plan view and a
cross-sectional view of the counter electrode provided on one side of the diaphragm 4, and FIG. 4
shows a plan view and a cross-section of the oscillation circuit provided on the other side of the
diaphragm 4. Figure shows. Hereinafter, the present invention will be described in detail with
reference to the drawings. A silver paste is applied on one side of a lead zirconate titanate flat
plate ceramic piece 1 having a thickness of 200 to 300 μm and a diameter of 15 to 305 mφ so
as to provide a flat portion 21 and a lead portion 22 as shown in FIG. After drying and then using
silver paste as well on the other weir, as shown in FIG. After application and drying so as to
provide divided electricity 1fjL32, baking is performed at about 750 ° C. for about 15 minutes
to complete the electrodes 2 and 3. The ceramic piece is polarized at room temperature for about
1 hour at a voltage of 4 kV / m, and the oscillation circuit 5 is adhered to the other surface of the
diaphragm 4 with, for example, an epoxy adhesive by a method described later. At this time, a
predetermined portion of the oscillation circuit is connected to the electrode. In order to obtain
electrical insulation of an aluminum plate having a thickness of 200 μm and a diameter of 40
mm, the diaphragm 4 is used, for example, by anodizing. The diaphragm 4 is provided in advance
with a through hole of about 11111φ in order to connect a predetermined portion of the
excavating circuit and the electrode. The oscillation circuit 5 forms a circuit pattern 6 as shown
in FIG. 4 on the side on which the counter electrodes 2 and 3 of the alumite-processed
diaphragm 4 are not provided, using one stroke at 4%. After drying, the resistance part 7 is
printed and dried by a carden resistance paste, and then it is fired at about 170 ° C. for 1 hour,
and finally it is made by soldering a microminiature transistor. Since the piezoelectric sounding
body is reduced in size and weight by integration and hybridization, it is effective for use as an
alarm device for various small electronic devices.
Brief description of the drawings
FIGS. 1 (a) and 1 (b) are a plan view showing a piezoelectric-type sounding body as one
embodiment of the present invention, a cross-sectional view taken along the line A-A ', and FIGS.
FIG. 4 is a plan view of the opposing ii and the pole provided on the piezoelectric sounding body
shown in the figure and its cross section, and FIG. 4 is a plan view of the oscillation circuit having
the pressure shown in FIG. Cross-sectional view O (description of reference numerals) 1 ...
piezoelectric ceramic material, 2, 3 ... opposite electrode, 4 ... diaphragm, 5 ... oscillation circuit, 6
... circuit / e turn , 7 ... resistance portion, 21 ... flat portion, 22 ... extraction boiling, 31 ... main
electrode, 32 ... divided electrode.
Figure 1 (a) (b) Figure 2 (a) (b) Figure 3 (a) (b) Figure 4 (a) (b)
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