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JPS5578278

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DESCRIPTION JPS5578278
Description 1, title of the invention
Sound generator in small electronic devices
3. Detailed Description of the Invention The present invention relates to a sound producing
device in a compact electronic device, and more particularly to a sound producing device using a
piezoelectric element. □ A sound generation device using a piezoelectric element applies a
voltage to a diaphragm such as a metal plate or a glass plate to generate a strain when a voltage
is applied, and applies a voltage periodically to the piezoelectric element to vibrate the
diaphragm. Because it has a simple and thin structure, it is used as a sounding device for small
electronic devices such as electronic watches and electronic small computers. Although this type
of sounding device is generally housed in an equipment case having a sound emission hole
formed therein, the time display unit is protected particularly in an electronic watch that is
required to be made smaller and thinner. It is considered to use the watch glass which is being
used as a vibrator of the sound producing device. For example, as shown in FIG. 1, the
piezoelectric element 5 is adhered with an adhesive 4 to the inner surface of the watch glass 3
attached to the upper opening of the watch case 1 via a waterproof or twin key 2 or the like. . In
addition, 6 is a printing layer egg-grained on the target recording glass 3 for the parting off of a
display, decoration, etc., and 7.89 are electrodes of the said piezoelectric element 5, respectively.
In such a structure in which the watch glass is used as a diaphragm, the watch module contained
in the watch case 1 is provided with an elastic connector 9.10 including a plate spring or a coil
spring, and these elastic connectors 9.10 are provided. Through the electrode? The application of
the drive voltage of the piezoelectric element 5 between 8 and 8 is desirable in terms of
mounting. For this reason, in the above-described conventional structure, the conductive IJp plate
11 is previously attached to the upper surface electrode 7 for the electrical connection between
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the elastic connector 9 and the upper surface electrode 7 of the piezoelectric element 5 and
EndPage: 1. I needed to keep it. Also, the attachment of the lead plate II must be performed
accurately in correspondence with the elastic connector 9, and when a plurality of piezoelectric
elements 5 are attached to the watch glass 3, individual piezoelectric elements As it is necessary
to attach the lead plate 11 to 5, respectively, it is difficult to connect the pressure city Ajino 5 to
the clock module. SUMMARY OF THE INVENTION The present invention is a book made in view
of the above-described points, and provides a sound generation device in a small electronic
device that can be thinly mounted and can be easily electrically connected to a watch module. An
embodiment of the present invention will be specifically described below with reference to FIGS.
2 to 4. FIG. 2 is a longitudinal cross-sectional view of the present invention applied to a t-child
watch, and FIG. 3 is a perspective view of the main part of FIG. Reference numeral 21 denotes a
watch case, and reference numeral 22 denotes a watch glass attached to the upper opening of
the watch case 21 via a waterproof / 4 'seal 23.
On the inner surface of the watch glass-i, 22, a printing layer 24 having a function as a display
parting and a decorative plate of the watch is formed, and a display device (not shown)
incorporated in the watch case 21 such as a liquid crystal display device The displayed time
information can be visually recognized from the outside through a non-printed portion located at
the center of the watch glass 22. The printing layer 24 is formed by printing an organic paint
composed of an epoxy-based or phenol-based medium or the like mixed with a predetermined
filler to a thickness of about 10 μ (micron) by screen printing, and at about 100 degrees Celsius.
It is dried by heating for about 30 minutes and baked. Reference numeral 25 denotes a
piezoelectric element in which electrodes 26.21 are formed on both upper and lower surfaces,
and is fixed on the print layer 24 by a thermosetting conductive adhesive 28. For this fixation,
first, the thermosetting conductive adhesive 28 was applied to a thickness of about 20 μ on the
mark 811 layer 24 of the watch glass 22, and the piezoelectric element 25 was held in an
appropriate pressure state thereon Then, it is carried out by heating and drying at about 150
degrees Celsius for about 30 minutes. The thermosetting conductive adhesive 28 is, for example,
about 50 to about 139 parts by weight in an epoxy type or phenol type medium. -A metal
particle of cent's gold, silver, or bananoyume, etc., which has been hardened by heating, and the
layer of the conductive adhesive 28 has a function as a lead plate of the upper surface electrode
26 of the piezoelectric element 25 It is. Reference numerals 29 and 30 indicate metal leaf
springs and coil springs provided in the watch module. When the watch module is incorporated
in the watch case 21, the plate spring 29 is also attached to the layer of the conductive adhesive
28, The coil springs 3 o are in pressure contact with the lower surface electrodes 22 of the
piezoelectric element 25. Therefore, when it is time to sound, the plate spring 29. A high voltage
of a clock module is applied between the electrodes 26 ° 27 of the piezoelectric element 25
through the coil spring 30 in parallel with the layer of the conductive external adhesive 28, and
the piezoelectric element 25 is distorted by the application of the pressure. The sound of the
glass 22 is vibrated. As described above, since the piezoelectric element 25 is attached to the
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inner surface of the watch glass 22 with the conductive adhesive 28, it is not necessary to
provide a lead plate on the upper surface electrode of the piezoelectric element as in the prior
art. In addition, the contact position of the flat spring 29 with respect to the layer of the
conductive adhesive 28 and the contact position of the coil spring 3 o with the lower surface
electrode 22 of the piezoelectric element 25 have room respectively, and electrical connection
between the sound producing device and the clock module is simplified. You can go very easily.
Since the mechanical strength of the watch glass 22 which is a conductive adhesive 280 layer (5
t 1 diaphragm is still increased, it is possible to make the thickness of the watch glass 22 thinner,
the thickness of the watch glass 22 was made thinner In this case, not only the thickness of the
entire watch is reduced, but also the weight is light, and furthermore, the loss of vibration energy
which causes the watch glass 22 to resonate and produce sound is small, so that the sounding
efficiency can be improved. Furthermore, the conductive adhesive 281Q layer exerts a shielding
effect on the electronic circuit of the timepiece module. In the above embodiment, an example is
shown in which a single piezoelectric element 25 can be attached to the inner surface of the
watch glass EndPage: 2 screen 22. However, for example, in order to make a plurality of different
sounds ring, it is shown in FIG. A plurality of (two in the embodiment) piezoelectric elements may
be provided on the inner surface of the ras 22 as a tense. In this case, the upper surface electrode
26a of each of the piezoelectric elements 25m, 25b. Since both 26b are in contact with the layer
28 of the conductive adhesive, the layer of the conductive adhesive 28, the lower surface type &
27 m of the piezoelectric element 25a, and the piezoelectric element for the electrical connection
between the time opening module and the sounding device. The lower layers 27b of 25b may be
independent of each other and the layers 28 may also be separated and independent
corresponding to the pressure ts 25m, 25b, in which case one more connection is required. Also,
for example, when an appropriate noodle is added to the conductive adhesive 28, the layer of the
conductive adhesive 28 has a decorative effect, and the printed layer 24 is not provided. It is also
possible to use the layer of the conductive adhesive 28 as the top electrode of the piezoelectric
element 25 without forming the top electrode 26 on the element 25. Furthermore, the present
invention is not limited to an electronic wristwatch equipped with an optical display device such
as a liquid crystal display device, but of course a pointer display type electronic wristwatch as
well as a data display unit such as an electronic small computer The invention is applicable to all
of small heavy equipment equipped with display window glass. As described above in detail, the
sounding device of the present invention has a structure in which the piezoelectric element is
fixed to the inner surface of the display window glass of the small heavy equipment with a
conductive adhesive. As a result, the electrical connection between the sound generation device
and the electronic device module is easy, and the front face of the device case is also emitted, so
that the sound emission efficiency is good.
4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view showing a
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conventional embodiment, and FIG. 2 is a longitudinal sectional view according to the invention
in which the embodiment is applied to an electronic wristwatch, FIG. FIG. 4 is a perspective view
showing another embodiment of the sound producing apparatus which is the main part of 2v. 22
· Watch glass, 25.25 龜, 25b ... Piezoelectric house 7.26.26h, 26b, 27.27 *. 27b · electrode, 28 · ·
thermosetting conductive adhesive. Applicants Attorney Attorney Takehiko Suzue Figure 1 Figure
2 EndPage: 3
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