DRIVER FOR PIEZOELECTRIC ACTUATORS

摘要

To make it possible to sustain a low power consumption for the entire driver in a driver of a piezoelectric actuator, by reducing the number of components and switching the piezoelectric actuator at a high speed. Common resistors Ra and Rb for current limitation are interposed at some midpoint of the feeder lines 19 and 21. Phototransistors Q1 to Q8 are connected to the power source side of the common resistors Ra and Rb of the feeder lines 19 and 21. Piezoelectric actuators 1a to 1h are connected to terminals Sa and Sb of the common resistors Ra and Rb on the side opposite to the power supply section, and to the joints of the phototransistors Q1 to Q8. Light emitting diodes D1 to D8 are disposed in proximity to the phototransistors Q1 to Q8, and the light emitting diodes D1 to D8 are switched and conducted at a switching control section 25. The switching control section 25 overlaps conduction control of the light emitting diodes D1 to D8 corresponding to the next piezoelectric actuators 1a to 1h, after the 70% charged state of the piezoelectric actuators 1a to 1h in association with the on-operation of the piezoelectric actuators 1a to 1h.