To solve the problem that a noise and a transient current value are increased because the number of switch means for concurrently performing switching is increased, when multivalued control is performed by selecting a required driving signal from a driving waveform including a plurality of driving signals within one driving period.

When the switching means for selecting the driving signal from a common driving waveform including the plurality of driving signals within one driving period is opened/closed by a part for connecting the driving signals together, so that the selection/nonselection of the driving signal can be performed, selection starting timing for selecting the driving signal, and selection terminating timing for setting the driving signal to be in an unselected state are made different from each other. This reduces the number of the switch means to be simultaneously opened/closed.