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JPS5669795

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DESCRIPTION JPS5669795
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of an
electronic watch showing an embodiment of the present invention, FIG. 2 is a perspective view in
which a piezoelectric element is provided on a diaphragm, and FIG. 3 is a piezoelectric element
on the diaphragm. It is a perspective view which shows the other Example provided. 3.13 · · · · · ·
Piezoelectric element, 4, 14 · · · · · · · · · · · · · diaphragm.
The present invention relates to a piezoelectric buzzer in an apparatus having an alarm
mechanism, such as an electronic watch. Conventionally, as this type of piezoelectric buzzer, a
single piezoelectric buzzer is driven in a time division manner so that multiple information such
as chords is generated. It is known to generate sound. This is further divided within a given time,
and different signals are input to the piezoelectric element to oscillate, thereby increasing the
damping rate of the diaphragm and using the superposition of vibration and the residual sound
of the auditory signal to generate multiple information. It is what gets a sound. However, in the
above-mentioned piezoelectric buzzer, since the input drive signal to the piezoelectric element is
a pulse signal, it is not possible to synthesize the input (1) 0 force signal. I can not get it.
Furthermore, a mechanism and a circuit are required to divide the time and to generate a pulse
signal at the divided time, and the mechanism as a piezoelectric buzzer becomes complicated.
Even when trying to generate a chord by fft, time division, the sound generated here is a little
unnatural as a chord, and it has the drawback of being hard to listen to. Besides, although it is
conceivable to use a plurality of piezoelectric buzzers having different timbres in order to obtain
a plurality of sounds, a large space is taken, which is not preferable in a small device such as an
electronic watch. SUMMARY OF THE INVENTION The present invention is intended to solve the
defects in the art, and it is an object of the present invention to provide a whole piezoelectric
buzzer capable of generating a plurality of sounds simultaneously and changing the plurality of
sounds to be multifunctional. Specifically, the piezoelectric buzzer is divided into a plurality of
piezoelectric elements so as to operate individually, and the piezoelectric buzzer is provided on a
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diaphragm of one of the piezoelectric elements. An embodiment of the present invention will be
described below with reference to the drawings. FIG. 1 is a schematic structural view of the
electronic watch, which is a watch body housed in (1) 0 side, 1 side of the wristwatch, and 3) the
side of the wristwatch. In the watch side 1, the ceramic piezoelectric element 3 and the
diaphragm 4 are further housed, and the back cover! I is screwed on to hold the diaphragm 4.
FIG. 2 is a perspective view showing a state in which the piezoelectric element 3 is attached to
the diaphragm 4. The diaphragm 4 is integrally provided with a flange 4bt integrally with the
periphery of a base 4a formed by processing a thin metal plate made of stainless steel or the like
into a plate. A plurality of divided piezoelectric elements 3... Are attached to the bottom surface
of the base 4 a, and the electrode portions 3 a are provided on the upper surfaces of the
respective piezoelectric elements 3. The electrode portion 3a is connected to the timepiece body
2 to input pulse signals individually, and operates the respective piezoelectric elements 3... All
independently.
The flange 4b of the diaphragm number is sandwiched between the watch 2 and the intermediate
ring 6 held by the back cover, and the shooting cover 4 is fixed by screwing the back cover 5 to
the watch side 1 There is. At the same time when the moving plate 4 is fixed, the elastic
connector 7 made of a conductive material is in pressure contact with the electrode portion 88 of
the pressure element 3 ... and is in electrical contact with the timepiece 20 circuit conductive
portion (3) Be done. 3 Thereupon, the clock pulse signal is separately input from the clock 3 to
each of the piezoelectric blanks so as to operate independently. Then, the strain diaphragm 4 is
displaced in accordance with the input signal of each piezoelectric element 3. The displacements
of the moving plate numbers due to the respective piezoelectric elements 3... Are linearly
synthesized, so that a synthesized sound of each input signal is eventually generated. This
synthesized sound is emitted to the outside of the wristwatch from the plurality of sound
emission holes S provided on the back cover 6C. Another embodiment in which the piezoelectric
element in the present invention is provided on the diaphragm is shown in FIG. It is shown. The
diaphragm 14 has a base 14a and a flange 14b, which are the same as the diaphragm number
described in FIG. 2, and the piezoelectric element 13 is installed on the bottom of the base 14a.
The piezoelectric element 13 has an appropriate thick type, and the electrode portion ISa
provided on the surface is divided into a plurality. In the same way as shown in FIG. 1, the
connector 7 is pressed into contact with each of the electrode parts 111a. (4) The piezoelectric
element 13 in the portion where O and the electrode portion 18a exist is distorted according to
each input signal, and is displaced by one moving plate 14tl to emit a linearly synthesized sound.
Then, the sound is emitted to the outside of the watch from a plurality of sound emission holes 8
provided in the back cover 5. From the above description, according to the present invention, a
plurality of sounds are generated by one diaphragm, and the sounds cause various chords and
various synthesized sounds. In addition, by changing the number of actuated piezoelectric
elements, a large number of sounds having different timbres and sizes can be obtained, so that a
multifunctional buzzer can be obtained. In addition, since a single imaging plate is used,
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penetration is simplified, a small-sized piezoelectric buzzer can be made, and its use range
becomes wider as it is used for the above multi-functionalization.
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