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JPS5621792

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DESCRIPTION JPS5621792
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of the present invention, and FIG. 2 is a partial plan view of a diaphragm. 1 · · · Case body, 2 · · · · ·
· Glass plate, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · , 6 · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1st piezoelectric element, 9 · · · 2nd piezoelectric element, 10.
11 · · · ......... It is a spring.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound generator
structure (1) in an electronic watch with an alarm. In general, an electronic timepiece with an
alarm using a piezoelectric element is provided with a diaphragm with a fixed interval between
the back cover of the watch Dane, and the structure in which this movable plate 1mQII
electrophotographic device is fixed, a piezoelectric element When the C2 coincides with a
predetermined time, a drive signal is applied, and an alarm sound is reported. However, since the
drive signal is an intermittent single frequency, the alarm sound is monotonous and does not
change. SUMMARY OF THE INVENTION The present invention has been made in view of the
above-mentioned point, and provides an electronic watch which generates alarm sound Vll of
different timbre by applying a plurality of frequencies to the piezoelectric element. The present
invention will be described in detail with reference to FIG. 1 jiv. Figure wJ1 is a cross-sectional
view showing an embodiment of the present invention. 11) is a case main body, a glass plate (2)
is omitted on the display surface, and an hour hand mozziere (3) is built in the inside. 鳳 4) is a
back hole provided with a sound emission hole 15+ at the periphery s (: 1 or more, and this back
cover (4) is screwed or fitted to the case body (1) via a waterproof patch t61V. -1 combined. (Η
is a diaphragm made of a circular metal thin plate, and a step is formed on the circumferential
portion thereof, and the diaphragm is formed by interposing a step m between the back surface +
41 and the pachinko (8) (7) is supported by the darkness of the back cover 14) and the watch
module 13). On the surface of the diaphragm (7) opposite to the hour hand module (3), the same
is saved by the piezoelectric element (9) of @ 2 and the electroconductive ml, 1llli1 etc., which is
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the feature of the present invention. There is. The first and second piezoelectric elements 181 +
91 have both picture electrodes, and the 10,000 electrodes are electrically connected to the case
main body 11 by means of the mobile terminal + 71 3, and the other electrode is a drive circuit
of the clock module (3); : Each is connected by a spring 11 · I. FIG. 2 is a partial plan view of the
diaphragm (7) used in the embodiment shown in FIG. 1, and a circular first piezoelectric element
is fixed at the center of the diaphragm 17). Around it, it is fixed in @ 2 piezoelectric element (9)
or donut shape. In such a structure (1), the frequency of the drive signal applied to the first
piezoelectric element + (the highest) and the second piezoelectric element (9) should be different:
Therefore, the central portion of the diaphragm (7) The vibration is different from the one
around it and its surroundings. For example, if the fundamental frequency is applied to the first
piezoelectric element (8) and a frequency that is an integral multiple of the fundamental
frequency is applied to the WJ2 piezoelectric element (9), the central part of the diaphragm (7)
and its surroundings are divided Vibrating, the tone produced is different from that of a single
frequency.
In addition, the ratio of the frequency to be applied can be arbitrarily switched to two by the
driving circuit of 7 clock module (3) circle (it is possible to change the timbre according to the
type of alarm). Furthermore, by dividing the piezoelectric element into four in number and
applying different frequencies to each of them, it is possible to make history (-a plurality of
micromotions and inspire various timbres). As described above, according to the present
invention, by applying different frequency and piezoelectric elements, the tone color of the alarm
sound becomes different from that of the conventional one, and furthermore, the alarm can be
distinguished according to the tone difference. This improves the commercial value of the
electronic watch.
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