DRIVE CIRCUIT FOR CONTROLLING A MOVABLE MAGNETIC HEAD

摘要

An improved drive circuitry for controlling the deflection of a bimorph comprising a pair of electrically poled piezo-ceramic elements bonded to a common substrate is disclosed which applies deflection voltage in a manner whereby the polarity is always in the poling direction of each of the elements so that depolarization of the piezoceramic elements does not occur. The circuitry applies a common polarity D. C. biasing voltage to both of the piezoceramic elements of the bimorph and also applies oppositely phased A. C. deflection signals to the respective piezoceramic elements.