Electric circuit for driving a piezoelectric vibrator
AssigneeSeikosha Co., Ltd.
InventorMitsuhiro Hamatani
Life of this patent
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Abstract
A diode and a coil are connected in series to the output side of a driving circuit switched ON and OFF upon receipt of a pulse signal and a piezoelectric vibrator is connected in parallel with the series-connected diode and coil. The piezoelectric vibrator is driven by a reverse induced voltage produced in the coil when the driving circuit is switched OFF so as to apply more electric energy for driving the piezoelectric vibrator than would be the case if the diode were omitted.
Claims4
In an electric circuit for driving a piezoelectric vibrator of the type comprising a parallel circuit comprised of a coil connected in parallel with the piezoelectric vibrator with one side of the parallel circuit connected to a voltage supply source and the other side of the parallel circuit connected to a switching means for switching between ON and OFF states in response to pulse signals applied thereto to thereby apply driving forces to said piezoelectric vibrator;
- the improvement comprising means including a diode connected in series with said coil such that the series-connected diode and coil are in parallel with said piezoelectric vibrator for applying the reverse induced voltage produced in said coil during the OFF states of said switching means to said piezoelectric vibrator to thereby apply driving forces of greater magnitude to said piezoelectric vibrator than would otherwise occur without said diode.
Dependencies are inferred from the claim text.