Patent ID: 8237327
Filing Date: 2012-08-07
Classification: G03B,H02N

Abstract:
1. A piezoelectric-actuator control circuit for using a piezoelectric actuator to control a displacement of an object of driving on the basis of a required amount of displacement of the object of driving, the amount being obtained for each of predetermined servo control cycles, the piezoelectric-actuator control circuit comprising: a drive-pulse generation unit for selectively generating and outputting to the piezoelectric actuator a displacement pulse and a stationary pulse as a drive pulse for application to a piezoelectric element of the piezoelectric actuator, the displacement pulse having a duty ratio for causing the object of driving to be displaced by a predetermined step width, and the stationary pulse having a duty ratio for causing the object of driving to remain stationary in a current position; and a control unit for causing the drive-pulse generation unit to produce the displacement pulse when a remainder of the required amount of displacement is equal to or greater than a predetermined threshold value and for causing the stationary pulse to be produced when the remainder is less than the threshold value.