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TECHNICAL FIELD The present invention relates to a method of driving a sound generator used
for generating an alarm sound of an electronic device used for a ringing tone of a telephone, an
alarm sound such as an alarm, a home appliance, an office machine, an automobile, a toy, etc. It
is. 2. Related Art In recent years, with the development of semiconductor technology and sensor
technology, electronic devices have become complex and have advanced functions. In particular,
with the advent of microcomputers, it has become possible to detect various types of information
with sensors, process them with computers, and transmit them to people by means of images and
sounds. In the case of voice communication, as the amount of information increases, it becomes
more necessary to distinguish individual information, change the tone color to make it easier for
people to judge and pronounce it, or change the tone color according to the preference of the
listener. There is. Heretofore, a sound generator for generating a single sound has been used in
this type of electronic device. Therefore, the sounding body was used for the purpose of
generating a single sound, and was driven at its most efficient frequency. As shown in FIG. 6, the
drive circuit applies to the sound producing body 3 an audio frequency obtained by dividing the
frequency of the micro oscillator 2 for driving the computer 1. Problems that the Invention is to
Solve In such a conventional method, there is a problem that various sounds can not be emitted
to provide a large amount of information to a person. The present invention is intended to solve
such problems, and it is an object of the present invention to provide a method of driving a
sounding body by driving the sounding body with sounds of a plurality of frequencies and
obtaining a large output sound pressure. . Means for Solving the Problems In order to solve the
problems, the present invention has a first resonant frequency, a second resonant frequency f2
and a resonant frequency f3, and the relationship between the three frequencies is f, <fs Using a
sounding body having a relation of <12, f, "(2 n-1> f & rf 2-("-') "fb + f 5 = (one in 2) fo (where n).
The driving circuit is connected to an oscillation circuit that emits frequencies fa, fb, and f0 of
integers m and m respectively. Operation According to this method, a large sound pressure can
be realized at each frequency by matching the resonance frequency and the resonance frequency
of the sounding body with the excitation frequency or odd-order harmonics thereof from one
drive circuit. Embodiment An embodiment of the present invention will be described with
reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a sound
generator for the purpose of explaining the present invention. The ceramic piezoelectric speaker
is shown as an example. In FIG. 1, 11 is a ceramic piezoelectric body, 12 is a diaphragm and both
are bonded with an adhesive to form a piezoelectric vibrator.
A case 13 has a sound emission hole 14 on the front side. A resonance air chamber 16 and a
back case 16 are fixed to the front case 13 with an adhesive. The back case 16 may not be
necessary. The input is performed through the leads 17 & 17k). FIG. 2 shows an example of
sound pressure frequency characteristics of the sine wave drive of the above-mentioned
sounding body. The first resonance frequency 8 and the resonance frequency 12 + the second
resonance frequency have a characteristic that a large output sound pressure can be obtained.
An example of a drive circuit is shown in FIG. The drive circuit is coupled to the first oscillator
21. Second oscillator f b22, third oscillator f. ??? And a switching circuit 24 to switch the
oscillation signal and apply it to the sound generator to produce a sound. In this case, the
switching circuit 24 can appropriately select or combine the signals from the respective
oscillators. Other oscillators may be provided. The signal applied to the sound generator is
preferably a square wave. Consider, for example, the case where a square wave signal is input to
this sounding body. A square wave can be considered as a collection of a sine wave of its
fundamental frequency and its higher harmonic components. In particular, low-order harmonic
components are large components. Therefore, when the sound generator is driven by this square
wave, the sound of the third harmonic component and the sixth harmonic component as well as
the sound of the basic frequency are simultaneously generated. For example, if the sound
generator is driven by a square wave with a resonance point that generates a large sound
pressure at 1 KHz, a large sound pressure can be obtained at the drive frequency of I KHz and at
the same time a 1 KHz sound is relatively generated even when driven by 333 Hz and 200 H2. It
is obtained as a large sound pressure. In the present invention, even if the sound of the first
resonance frequency f and the + second resonance frequency f 2 + the resonance frequency f 5 is
driven at a frequency of 3/3 mm and f 2/3 according to such an operation principle. It is
intended to obtain pressure. Fig. 4 shows the sound pressure frequency characteristics in the
case of driving with square waves, but in the case of sine wave driving, the sound pressure part is
also large at frequencies that are an odd fraction of those frequencies, in addition to 8 and f2 f
f3. Appears and can be used over a wide frequency range. To explain an example using the
driving method of the present invention as the ringing tone of a telephone, the ringing tone is
usually switched between two tones at a frequency of around 10 Hz alternately. In addition, there
are also ring tones that can be selected by preference. For this reason, the sounding body needs
to be able to obtain a large sound pressure at three to four frequencies. Therefore, the first
ringing tone is driven at the frequency of fa, fb, and the second ringing tone is driven at 8 l / Q.
In this case, fa = 1.25 fo, fb = 1.2ts f. Keep in a relationship. f2L = f4. fb = f2 / 3. A large sound
pressure can be obtained by setting the frequency to f0 = f3 / 3. At this time, f2. It is desirable
that the output sound pressure at f is greater than the output sound pressure at fl. As described
above, according to the present invention, the first resonance frequency f, the second resonance
frequency f2, and the resonance frequency f3 are provided, and the relationship among the three
frequencies is f + <15 <12 Using the sounding body, f,-(2n-1) eight. ?????????????
?????????????? By connecting to and driving oscillator circuits that emit
frequencies f, fb and f0 of r ku respectively, large output sound pressure can be obtained even if
the sounding body is driven with sounds of multiple frequencies. It is a thing.
Brief description of the drawings
FIG. 1 is a cross-sectional view of the sounding body used in the description of the present
invention, FIG. 2 is a graph showing sound pressure frequency characteristics by sine waves of
the sounding body, and FIG. 4 and FIG. 4 show sound pressure frequency characteristics when
the above-mentioned sounding body is driven by a square wave, and the first and sixth figures
show driving circuits of the conventional sounding body.
11 и и и Ceramic piezoelectric body, 16 и и и и и и Resonant air chamber, 21 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 и и и oscillator f2 L, 22 и и и и и и и и и и и и и и и и и f0.24
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Name of Agent Attorney Nakao Toshio Other 1 person
Fig. 1 Fig. 2 Frequency a (H kan) 743 Fig. 4 Frequency () ll Fig. 2 Oscillator
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