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JPS5745697

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DESCRIPTION JPS5745697
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are circuit diagrams showing a
conventional example, FIG. 3 is a circuit diagram showing an embodiment of the present
invention, and FIGS. 4a and 4b show drive waveforms of the prior art and the present invention.
FIG. 7 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 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. Vibrator, 10 ииииии Drive coil, 11 иии Battery и 12, иии Diode.
The present invention relates to a drive circuit for driving a piezoelectric vibrator in an electronic
timepiece with an alarm, and in particular, occurs in a piezoelectric vibrator when an electronic
wait needle is accidentally dropped or given an impact. High electromotive force to prevent
destruction of the integrated circuit (LSI) and erroneous operation of the clock circuit, and to
improve the sound pressure of the alarm sound generated from the piezoelectric vibrator as well
Generally, in an electronic timepiece with an alarm (a drive N path when a piezoelectric vibrator
is used is configured as shown in FIG. 1C. (1) is an LSI in which clock circuits and the like are
integrated and configured by C-4, 4OS, and the LSI (the time is arbitrarily set for ?: the alarm
signal (2) to be output is a transistor (3) The base C is applied. The piezoelectric vibrator (31) is
connected to the negative electrode of the transistor (31 is an NPN type and the L-mittor is the
battery 1.4), and the piezoelectric vibrators 5 and 2 are also supported between the battery and
the positive charge i of the battery 4). The coil (6) is being compensated. When an impact is
applied to the piezoelectric vibrator 5 in FIG. 1 (: in FIG. 1), the source electric vibrator (5)
generates an electromotive force according to the & shape, and the electromotive force is
generated by the piezoelectric vibrator (both ends of 5 + It can be as high as 1007C. In this case,
the a direction is also different depending on the deformation direction I of the piezoelectric
vibrator (5). If the electromotive force of the battery (4) is positive compared to that of the
positive electric machine g, the VCIIO and ZO Cta of the transistor (3) have fairly high withstand
voltage and therefore the battery (the positive electrode of the 4j There are not enough five. On
the other hand, when an electromotive force in the negative direction is generated C: a collector
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(direction of the collector C from the base 31 C: a pressure buildup occurs, and this direction has
a diode characteristic in the forward direction, and current flows even at extremely low voltage.
Since this current flows to the battery (4), the voltage of the battery 14) fluctuates significantly
due to the internal resistance of the battery 14), the contact resistance of the terminals, and the
like. The LSI (1) has a built-in reset circuit when power is applied. If the voltage of the battery (4)
fluctuates significantly, this function operates, and IC clinker etc. inside the LSI fl + is reset. There
will be time to go mad. Also, the magnetic current may lead to the destruction of L8Iill, etc.,
because it flows to the base of the transistor (3) through the LSI (N channel MO8 inside 11)
transistor or the storage diode. Conventionally, the circuit shown in FIG. 2 has been used to solve
these problems. In the circuit shown in FIG. 182, between the transistor (the base of 31 and the
alarm signal 121 of LSIill I: liquid resistance Ik intervened, the collector and the negative
electrode ) In parallel with the resistor R2 and the capacitor?
C1 and C4 are connected, and a cabinet 5 two resistance R51if connection is made between the
drive coil (6) and the piezoelectric vibrator (5). In this circuit, R1 weakens the coupling with the
C-MOS inside the LSI (it reduces the influence on L8 rfll, R2 reduces the impedance of both ends
of the piezoelectric vibrator (5) to make the electromotive force Absorbing, R5 raises the
impedance of the electromotive force so that no current flows. 01 and 02 are spiked
electromotive force? Used to absorb. However, such a circuit has many parts used and also has
the disadvantage that the efficiency of the ▒ electric vibrator (5) is reduced. The present
invention has been made in view of the above-mentioned points, and provides a drive circuit of
an alarm-equipped electronic watch which completely eliminates the conventional drawbacks
with a simple circuit. Hereinafter, the present invention will be described in detail with reference
to ifi. FIG. 83 is a circuit diagram showing an embodiment of the present invention. (7) is an LSI,
+81 is an NPN transistor, (9) is a piezoelectric vibrator, +11 is a drive coil, U is a battery, and (13
is a diode. is there. LSl 17) A C-MO 8 is formed, and a clock circuit etc. is integrated, and an
arbitrary 5-bit signal (131 is a transistor (base l: M of 81) at an arbitrarily set time. The emitter of
the transistor (8) is connected to the negative electrode of the battery ti ? and the VSS terminal
of the LSI (7), and the collector C2 is connected to the diode a. Furthermore, a drive coil fil and a
piezoelectric vibrator (9) are connected between the diode O and the positive electrode of the
battery I and the VDII terminal of the LSI f7). The movement of the diode + 1 is a piezoelectric
vibrator (in the case where an electromotive force in the negative direction of 91 c is generated, a
diode negative reverse withstand voltage C double battery (from the negative electrode of 11 + to
the inside of LSI + 71 and the base and collector of transistor 8) It is intended to prevent current
from flowing through the relay. Providing this diode UaV C: The electromotive force generated by
the piezoelectric vibrator (9) is absorbed by the drive coil al and the piezoelectric vibrator (while
being vibrated by the resistance component of the parallel resonance circuit of the field and
absorbed and attenuated. And the influence on L8I17 + disappears. Also, the base-collector of
this diode-) '(11'11 month-old NPN-type transistor may be used. According to the circuit I shown
in FIG. 116: According to the circuit I shown in FIG. 116, there is a loss of charge by a voltage in
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the forward direction of the diode ?, but when operating with a battery ttn of about tSV 6 The
sound pressure can be improved as compared to the drive circuit described above, and it is
extremely advantageous when using a 5 v retame battery.
Also, in the dynamic circuit of @ 2, when the transistor (8) is turned off, a high voltage in the
positive direction is generated as shown in Fig. 184 (&), but the negative voltage generated when
turned on is clamped by the capacitor q1. And the resonant circuit does not operate. On the other
hand, in the embodiment I of the present invention shown in the fifth factor, the voltage in the
negative direction is blocked by the diode ? and operates as a resonant circuit without being
clamped as shown in FIG. 4 (11). Therefore, the waveform according to the present invention is
improved to improve the sound pressure and the sound quality. As described above, according to
the present invention, the reverse withstand voltage of the diode is utilized so that the
electromotive force generated in the piezoelectric element by impact is not applied to the battery
and the LSI (Niji, reset due to the fluctuation of the battery @fE or the inside of the LSI Current C:
It is possible to prevent damage and the like and to improve the sound generation efficiency and
the sound pressure.
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