force becomes u201c 0 u201d then in turn the current starts to decrease then since the magnetic flux passing through the inductor l decreases an electromotive force is generated in the inductor l in a direction a direction allowing the current to flow hindering the decrease in the magnetic flux see fig3 e as a result while electric charge is drawn out from c 0 a current continuously flows through the inductor l in a case where there is no loss in the middle of the movement of electric charge all the electric charge generated in accordance with the transformation of the piezoelectric member 108 moves and a state in other words a state is formed in which positive electric charge is distributed on the lower face side of the piezoelectric member 108 and negative electric charge is distributed on the upper face side thereof is formed in which the positive charge and the negative charge are displaced fig3 f shows a state in which all the positive and negative charge generated in accordance with the transformation of the piezoelectric member 108 moves in this state when the switch sw is maintained as turned on this time a phenomenon opposite to the description presented above occurs in other words positive charge disposed on the lower face side of the piezoelectric member 108 tends to flow through the inductor l and at this time a counter electromotive force is generated in the inductor l in a direction hindering the flow of the electric charge thereafter after the current flowing through the inductor l reaches its peak and then decreases at this time an electromotive force in a direction a direction allowing the current to continuously flow hindering the decrease in the current is generated in the inductor l as a.