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TECHNICAL FIELD The present invention relates to an electrode shape of a piezoelectric buzzer.
[Prior Art] The structure of a conventional piezoelectric buzzer is shown in FIG. 6, in which a
diaphragm 1 consisting of a single thin metal plate is used as a first electrode, and a piezoelectric
member 2 is attached to the moving plate to make the piezoelectric member. The metal thin film
3 is formed on the top by vapor deposition or the like, and this is used as the second electrode,
and it generates sound according to the cycle of change of the voltage applied between the two
electrodes. In the field where it is intended to electro-acoustically convert a signal having a
plurality of different drum numbers by using (with the following drawbacks. In general, since the
sound pressure of the piezoelectric buzzer depends on the amount of charge, the circuit
configuration as shown in FIG. 4 is used as a drive circuit. In the figure, (al is a basic circuit, and
(t) l is a method for increasing the drive current in an attempt to calculate a voltage. As a method
of applying attenuation to the acoustic signal generated from the piezoelectric buzzer in the
circuit of FIG. 1, first, as shown in FIG. 5 (at, a plurality of transistors with different current
supply capabilities are connected in parallel. A method of connecting to the base end of the
bipolar transistor and switching back each current supply transistor to gradually reduce the pace
current to obtain attenuation of sound pressure, and secondly changing the tapping gradually in
the figure (b). It is well known to apply the above waveform to the base end to decrease the 08
hours of the bipolar transistor and gradually decrease the average current flowing through the
collector to obtain the sound pressure attenuation. On the other hand, when a plurality of
frequencies are combined to drive a ryngian echo transducer including a piezoelectric buzzer, in
the prior art, the outputs of the frequency generating systems 4 and 5 of FIG. The signals are
electrically mixed, and the electric sound # converter is driven by the mixed waveform. The same
figure (b) has shown the mode of the shaping | molding which the square wave which has
different frequency (theta) from the said single frequency generation system 5 was
output, and was mixed electrically. However, in general music with a main melody and
accompaniment due to two or more heavy tones, the generation times of the main melody and
accompaniment notes are completely asynchronous, that is, the decay of the main melody and
accompaniment notes must be performed asynchronously. Since the conventional transistor
switching system for current supply is driven by the waveform after mixing, the same heavy
attenuation can obtain the same attenuation, and the system for controlling the waveform duty is
shown in FIG. 6 (b). Can not be applied to the mixing waveform as described above, since it is not
possible to control the 08 hours of the Pivo 2 transistor as described above.
In the conventional piezoelectric buzzer, therefore, the heavy sound effect has adopted a method
of using the discharge characteristic of the capacitor for the attenuation of the acoustic signal. A
specific example using this method is shown in FIG. In the same figure, when a short pulse is
applied to the first switches 8 and 9 every note generated asynchronously from the single
melody generation system 6.7, the switch 8 is applied while the pulse is applied. .9 turns on and
the capacitors 10.11 are charged respectively, and when the pulse ends, the first switch turns off.
On the other hand, each single melody generation system outputs a signal having a frequency
corresponding to the pitch of each note, and is applied to the second switch 12.13 °. The second
switch is alternately connected between one end of the capacitor and the potential, depending on
the cycle of the applied signal, and operates to weight the frequency of the pitch to the light
discharge waveform of the capacitor. Also the 81! While the two switches are connected to one
end of the capacitor, the charge of the capacitor is discharged in the path of the capacitor, the
second switch, the mixing resistor, the base end and the emitter end. In this method, although the
mixing waveform similar to that shown in FIG. 6 can be obtained by the mixing resistor at the
base end of the bipolar transistor 140 in the present method, the piezoelectric buzzer 15 has the
first melody according to the threshold voltage VBH of the bipolar transistor. It has only the
frequency component of the pitch outputted from the generation system 6 and the frequency
component of the pitch outputted from the second melody generation system 7, and only a
waveform having two potentials of DD and VB2 appears. The sound signal generated from the
piezoelectric buzzer includes not only the frequency components of the pitch emitted from the
first and second melody generation systems but also the frequency components of the sum and
the difference of both, Gives an effect and makes the listener feel a sense of distortion. [Purpose]
The present invention is intended to solve the above problems and to apply the conventional
technology for giving a heavy sound produced from a piezoelectric buzzer a good sound quality
and giving an attenuation to a juice echo signal. [Summary] In the present invention, the pressure
'turtle buzzer is formed by attaching a piezoelectric member having at least two different
electrodes to a common diaphragm, and the different electrodes are respectively generated from
different single frequency generating systems. It is characterized in that it is driven by a signal.
EXAMPLES The present invention will be described in detail based on the following examples.
FIG. 1 (al is a perspective view in which a portion of a piezoelectric buzzer having a shape based
on the present invention is cut, wherein the diaphragm 1 is made in common to form one
electrode, and the piezoelectric member 2 attached to the diaphragm Two electrodes 6 are
formed on the top.
The principle circuit diagram for driving a piezoelectric buzzer having this shape is shown in FIG.
2. The common diaphragm of the piezoelectric buzzer 16 is connected to the VDD level, and the
different electrodes of the piezoelectric members are each at a single frequency. It is driven by a
signal from a generation system. Therefore, in the present invention, since the acoustic signals
having two different frequencies are not electrically mixed but are mixed to an auditor by the
common diaphragm, the phase difference between the two frequencies resulting from the
conventional drive system The ingredients of can be produced by brother, can obtain good
quality. In addition, since the present invention basically drives one piezoelectric buzzer with a
signal from each frequency generation system, it is possible to attenuate the acoustic signal by
the conventional current supply transistor switching system or the waveform duty control
system. It is obvious that we can. Another object of the present invention is to provide weighting
to a plurality of acoustic signals generated from a piezoelectric buzzer. As described above, since
the sound pressure of the acoustic signal generated from the piezoelectric buzzer depends on the
charge amount of the piezoelectric buzzer, if the area occupied by two different electrodes is
changed as shown in FIG. It becomes overwhelmed, and the target weight 6 can be obtained. In
the first embodiment of the present invention, the pressure member is common, and only the
electrode on the piezoelectric member is divided. However, the same effect can be obtained by
dividing the piezoelectric member together with the divided electrodes. . Further, although the
specific example in the description of the present invention shows an example of driving at two
different frequencies, when driving at six or more different frequencies, for example, in the case
of generating six tones of a main melody and two accompaniments It goes without saying that
the number of 'tj L poles of the piezoelectric buzzer is increased or decreased corresponding to
the number of different frequency generation systems. [Effect] As described above, according to
the present invention, since the sound signal generated from the piezoelectric buzzer can be
given a good sound quality, it is possible to replace the dynamic speaker with the piezoelectric
buzzer and to attenuate the generated acoustic signal. Since the prior art which does not require
external parts such as a capacitor can be applied as a method of providing the above, the
miniaturization and cost reduction of the entire acoustic signal generation system can be
Brief description of the drawings
FIG. 1 fal, fbl are external views of a piezoelectric buzzer having a shape according to the present
FIG. 2 is a principle diagram of the piezoelectric buzzer drive according to the present invention.
FIG. 3 is a structural diagram of a conventional general piezoelectric buzzer. Fig. 4 戟 1, (bl is a
general drive circuit diagram of a piezoelectric buzzer. Fig. 5 (al, '(bl is a prior art material that
attenuates an acoustic signal generated from a piezoelectric buzzer). Fig. 6 (al, (bl is the case of
mixing two frequencies. Fig. 7 shows an example of the circuit in the case of performing heavy
sound deduction by the conventional pressure 晰 buzzer. DESCRIPTION OF SYMBOLS 1 ...
diaphragm, 2 ... piezoelectric member, 3 ... electrode, 4.5 ... single frequency generation thread |
yarn 6.7 6.7 single melody generation system 8,9. 12.13: switch, io, ii: capacitor, 14: bipolar
transistor, 15.16: piezoelectric buzzer. Above Figure 2 Figure 3 Figure 4
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