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JPS57120291

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS57120291
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the periphery
of a piezoelectric element of a conventional electronic wristwatch with an alarm. FIG. 2 is a crosssectional view showing the periphery of the piezoelectric element of the electronic wristwatch
with an alarm according to the present invention. 1 is a watch module, 2 is a back pig, 3 is a
piezoelectric element, 4 is a buzzer lead terminal, 5 is a ground terminal, and 6 is a lubricant.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic
watch with an alarm using a piezoelectric element. In recent years, especially in digital watches,
alarms have become a standard function, and most digital watches use piezoelectric elements or
electromagnetic buzzers. As shown in FIG. 1, the structure of the electronic watch with alarm
using the conventional piezoelectric element has the pressure, ',' "-one-one 10, h1 type element 3
bonded to the back pig 2 'of the watch. The buzzer output terminal mounted on the inside of the
time opening module 1 conducts the buzzer output from the circuit to one electrode of the
piezoelectric element 3 and also earths to the back pig by the earth terminal 5 mounted on the
watch module 1 It is conducted to the one side electrode of the element 3. This drives the
piezoelectric element to make the alarm sound, but in this case, since the electrode of the
piezoelectric element 3 is a thin tin electrode, the spring force of the buzzer lead terminal 4 may
be large or the contact portion may be dimmed. , Paris, etc., or when the surface hardness and
adhesion strength of the piezoelectric element electrode are weak due to variations, there is a
risk of damaging the piezoelectric element electrode at the time of assembling the watch. In
particular, in the case where the back pig has a circular shape and has a screw type and is
incorporated in an outer package, there is a high risk that the piezoelectric element electrode and
the buzzer lead terminal 4 may be rubbed violently to damage the pressure 11 contacts.
Piezoelectric element 1! The damage of the pole may sometimes peel off the electrode, and at
this time, the electrical connection between the buzzer lead terminal 4 and the electrode may not
be achieved, and the alarm may not sound. These things are 5 watches shipped from the factory
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(2) 1 (If (9 when the alarm is ringing even if the user falls and the vibration shock is applied,
back pig 2 and watch module 1- The intense vibration may cause friction between the buzzer
lead terminal 4 and the piezoelectric element electrode to cause electrode damage, to make the
alarm not sound, and may also cause electrode damage at the time of repair. In these problems,
not only the structure shown in FIG. 1 but also the structure in which the piezoelectric element is
adhered to the inner side of the glass, the diaphragm having the piezoelectric element adhered to
the inner side of the back pig is separately provided However, when the buzzer lead terminal is
formed of a plate spring, a coil spring or the like and brought into contact with the piezoelectric
element electrode, there is a risk of occurrence. Next, the spring force of the buzzer lead terminal
will be described. Increasing the spring force promotes damage to the piezoelectric element
electrode, but conversely reducing the spring force will cause a drop impact between the buzzer
lead terminal 4 and the piezoelectric element electrode. The chattering occurs at the same time,
and the voltage generated by the piezoelectric element at that time is added to the circuit just as
it is, so it can be seen in 0 or more cases causing problems such as time deviation. When
designing an electronic watch with an alarm using a piezoelectric element, sufficient attention
must be paid to the design of the buzzer lead terminal, and market quality, repairability, etc. are
not reliable.
The present invention eliminates such a drawback, and in an electronic wristwatch with an alarm
using a piezoelectric element, a lubricant is applied to the surface of the piezoelectric element
electrode to provide friction between the piezoelectric element electrode and the buzzer lead
terminal. The spring force of the buzzer lead terminal can be increased by utilizing the fact that
the friction is reduced, and chattering between the piezoelectric element electrode and the buzzer
lead terminal is prevented. It has the purpose of solving the problem of time rush. In FIG. 2 to
describe the present invention in detail based on the following embodiments, a lubricant 6 such
as silicone grease is applied to the electrode surface of the piezoelectric element 3 adhered to the
watch back pig 2. As a result, the contact between the buzzer lead terminal 4 coming out of the
watch module arm 1 and the piezoelectric element electrode, f '5 (4) □ j 4 □, has a very small
friction with the lubricant 6, and it is repaired during assembly There is no need for electrode
capture at all times. In particular, in the case where the outer / outdoor pig 2 is incorporated in a
screw type, the scar on the electrode surface to be attached by the buzzer lead terminal is
significantly reduced. It is also confirmed that the degree of damage is very small even if the
spring force of the buzzer lead terminal is considerably increased, and the spring force can also
be increased for chattering prevention. Furthermore, as a matter of special note, even when the
configuration shown in FIG. 2 is taken, there is no increase in the contact resistance of the
contact portion due to the silicon grease 6, and there is no change in the electrostatic capacitance
of the piezoelectric element. Therefore, it has been confirmed that the alarm volume does not
change either. As described above, according to the present invention, in the electronic
wristwatch with an alarm using a piezoelectric element, the piezoelectric element electrode is
buzzer-leaded at the time of assembly, carrying, repair, etc. by applying a lubricant to the surface
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of the piezoelectric element electrode. Piezoelectric '') La ° by removing the risk of damage to
the terminals and the alarm not ringing, and by increasing the spring force of the buzzer lead
terminals. p44---It prevents chattering at the time of a drop between the 〆 element electrode
and the buzzer lead terminal, and has an excellent effect such as removing the danger of time
deviation and the like.
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