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JPS577296

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS577296
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are a plan view and a front view of a
conventional piezoelectric buzzer element, FIG. 2 is a circuit diagram of a separately excited
oscillation circuit for driving the piezoelectric buzzer element, and FIG. 4A and 4B are plan and
front views of another conventional piezoelectric buzzer element, and FIG. 5 is a self-excitation
type incorporating the same piezoelectric buzzer element. FIG. 6 is a circuit diagram of an
oscillation circuit, FIG. 6 is a front view when the piezoelectric buzzer element is supported with
nodes and vibrated, and FIGS. 7a and 7b are plan views of the piezoelectric buzzer element in one
embodiment of the present invention FIG. 8 is a front view of the piezoelectric buzzer element
with its outer periphery supported and vibrated. 6 ииииии Diaphragm, 6a ииииииииииииииииииииииииииииииииииииииииииииииии
Piezoelectric porcelain plate
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure formed
by bonding a piezoelectric ceramic plate to a diaphragm, [buzzer element, in particular, the
structure of the oscillation circuit is simplified, the resonance characteristic is stable, and the
support is easy. To provide a piezoelectric pressure element. As shown in FIGS. 1a and 1b, in the
conventional Senden buzzer element, piezoelectric ceramic plate 2 having electrodes 1a and 1b
provided on one side is bonded to diaphragm 3 made of a thin metal plate or the like. It has an
integrated structure. ??????? When an alternating current signal is applied to the two
electrodes 1a and 1b of the piezoelectric ceramic plate 2 through the lead wires 4a and 4b, [f the
electromagnetic plate 72 is expanded and contracted in the radial direction with the plate 2 fixed
on the diaphragm 3] Therefore, it generates a sound wave by causing deflection vibration as a
whole. The EE electronic buzzer element is driven by passive mode, using a blocking oscillator
(shown in FIG. 2), a multibibreak (not shown) and the like. The vibration is performed according
to the oscillation same wave number of the blocking oscillator or the like, and it is not always
necessary to vibrate with the inherent resonance same wave number of the piezoelectric buzzer
element. Therefore, as a method of supporting the piezoelectric buzzer element, an external
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support as shown in FIG. 3 is used. Generally, the interbody support is easy to put into practice,
but often the support is not completely fixed, and the support also vibrates to change the
impedance characteristics, resulting in a decrease in the Q of the piezoelectric buzzer element. As
described above, the Wang's City Buzzer Element of the above configuration has an advantage
that the supporting structure is simple and the cost is low because of using the external support.
However, since the resonance characteristics are unstable, ?иииии constant, and the Q of the lower
type buzzer element is low, it becomes ?7 [The input impedance of the lower type boom is
extremely large, so the input current is small. It is suppressed. There was a drawback that the
sound pressure was low. In addition, as a drive circuit, a blocking oscillation circuit or a multi-pibreaking circuit e. I hesitated. In order to eliminate the above-mentioned defects, an "electroscissor element" has conventionally been used which has a split electrode 1C as shown in FIG.
That is, this IF electric buzzer element takes out the lead wires 4a, 4b and 4C from the electrode
1a on the upper surface of the piezoelectric ceramic plate 2 and the electrode 1b on the lower
surface and the divided electrode 1C, respectively, and makes them input / output of electric
value '. . The driving method of this piezoelectric buzzer element is to oscillate by sending a
feedback signal from the divided electrode 1C to the base of the transistor 6 as shown in FIG. 5.
In this case, one transistor 5 and two resistors are used. The automatic oscillation circuit is easily
formed by three to be oscillated at the resonance frequency of -1 and the I fir buzzer element.
Further, the volume can be changed by changing the power supply voltage Uf or changing the
circuit resistance. However, since such a piezoelectric buzzer element constitutes a part of the
oscillation circuit using its resonance same wave number, it is necessary to make Q high, and
therefore, the nodal support as shown in FIG. 6 is used. Be In general, since the nodal support
supports the piezoelectric buzzer element freely and supports the portion close to the nodal
circle in the case of the chopstick, it is a supporting method with little influence on the
impedance characteristic of the support but the flat part The structure is complicated because it
is necessary to support the In this way, the lower type buzzer element has stable resonance
characteristics because of the joint support [l], and high Q can be obtained because of its high Q.
????? The drive circuit has the advantage of being simple in construction, but on the other
hand has the disadvantage that the support structure is complicated and expensive, since it has
to use a one-joint support. The present invention is intended to eliminate the above-mentioned
conventional defects, and in a piezoelectric buzzer element formed by bonding a piezoelectric
ceramic plate to a diaphragm larger than the piezoelectric ceramic plate, the waveform having
stretchability at the edge between the diaphragms- A lower mold element provided with six
uneven portions is provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The
present invention will be described in detail in its full embodiment on the basis of one drawing.
FIGS. 7a and 7b show a plan view and a front view of an l-F electronic buzzer element in an
embodiment of the present invention. In the figure, reference numeral 6 denotes a diaphragm
made of metal, and a plurality of corrugated concavo-convex portions 6a are provided in the
same IQ circle at the outer edge thereof. The corrugated uneven portion 6 a is easily provided on
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the diaphragm 6 by adding a breath, ?+1: sub door [or the like. At the central portion of the
diaphragm 6, an electromagnetic die plate 7 is attached. This [F electromagnetic wave imaging
plate 7 has the electrode 8a combined with the diaphragm attached to the diaphragm 6, and has
the electrode 8b and the divided electrode 8C on the opposite surface. In this way, when the
piezoelectric buzzer element is fully configured, since the corrugated uneven portion 6a provided
on the outer edge of the diaphragm 6 expands and contracts even when interbody support is
performed, as shown in FIG. The same vibration no. 7 state is obtained as in the above case, so
that a stable resonance characteristic is obtained 6 and the value of Q of the piezoelectric buzzer
element becomes high. Therefore, since this piezoelectric buzzer element can be supported
outward and can be incorporated into the self-help oscillation circuit shown in FIG. 5, an ugly
sound can be obtained, the structure of the oscillation circuit can be simplified, and the outer and
inner supports can be further enhanced. Because it is used, it has the effect of simplifying the
support structure and reducing the cost.
As described above, the king's buzzer element of the present invention is simple in oscillation
circuit and support, and is effective when used for small products such as a quartz oscillator
clock or digital alarm clock alarm and a calculator alarm etc. The practical value is great.
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