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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the characteristics of
alternating current applied voltage Vp and inductance L of a conventional coil. Fig. 2 is a graph
showing the characteristics of frequencies f and L of the conventional coil, Fig. 3 is a graph
showing the characteristics of Vp and L of the coil used in the present invention, and Fig. 4 is f of
the coil used in the present invention Fig. 5 is a cross-sectional view of a coil used in the present
invention, and Fig. 6 is a cross-sectional view of another embodiment of the coil used in the
present invention. FIG. 7 is a tone generation circuit diagram using the present invention. Seo,
Party Tower WE · Battery. Fig. 1 Fig. 2 / -r crest 157-actual opening 5l-36671 (2) Fig. 3 Fig. 4 r
± Fig. 5 Fig. 6 ■ Fig. 7 Fig. 158-
DETAILED DESCRIPTION OF THE INVENTION A--The present invention relates to an electronic
buzzer using a piezoelectric element to obtain a stable oscillation period in nine tone generating
circuits. A coil in which the magnetic loop is closed with a magnetic material having a high ratio
of electrical conductivity such as silicon steel or permalloy in the conventional magnetic loop is
as shown in the applied AC voltage vp and the inductance L and 嬶 211 as shown in FIG. It has
the characteristics of frequency f and inductance L. In the case of using such a coil in a time
constant circuit for determining the oscillation cycle, there is a problem that the inductance
changes due to the reduction of the power supply voltage and the change of the frequency to be
used. Further, when the magnetic loop is closed, the inductance largely varies depending on the
gap of the magnetic material, and the management of the gap is not easy. The present invention
eliminates the above-mentioned drawbacks, reduces the change of the inductance due to the
decrease of the power supply voltage and the operating frequency, and further reduces the
variation of the inductance O, and can easily manufacture a coil that can be manufactured as an
oscillator circuit using a piezoelectric element. The purpose is to stabilize one oscillation cycle.
Next, the% embodiment of the present invention will be described with reference to the drawings.
FIG. 3 is a graph showing the characteristics of the alternating current applied voltage vp and the
inductance L of the coil used in the present invention, and FIG. 4 is a graph showing the
characteristics of the frequency f used and the inductance. L is hardly changed by KV) and f as
shown in the figure, and a coil having such a characteristic closes the air coil shown in FIG. 5 or
the magnetic 2-material 3 shown in FIG. Not obtained by the coil used. In the figure, 1 indicates a
bobbin, and 2 indicates a winding Im. Accordingly, in the case where the coil shown in FIG. 5 or 6
is used as, for example, the coil 7 shown in FIG. 7, the oscillation period of this circuit is
determined by the inductance of the coil 7 and the capacitance of the piezoelectric element 8.
You can get a period. In the circuit of FIG. 7, 4 is a resistor, 5 is a capacitor, 6 is a transistor s7 is
a coil, 8 is a piezoelectric) element, 9 is a battery, and the piezoelectric element 8 # 1 is
quantitative. The mechanical oscillation of the 'kD1 piezoelectric element is used as a sound by
constructing a type oscillation circuit. As described above, according to the present invention, a
stable oscillation circuit with one oscillation period O can be obtained. * When using a
manganese dry battery etc. 1 * as a power supply, the battery voltage drop is avoided, but in the
case of a cracked grain, in general, in a simple rooster, sound is sufficient over a wide frequency
range It is difficult to obtain pressure and there is a great advantage to the kernel 3 to stabilize
the oscillation period.
The production of the coil is also simpler than that of the conventional coil, 69, and the variation
in the inductance can be reduced, and the practical effects are large.