SMART STEERING FOR FOUR WIRE THREE-DIMENSIONAL (3D) ACTUATOR

摘要

An actuator system for use in an optical pick up unit is disclosed. The system comprises a plurality of actuator drivers (301, 305, 309) , each actuator driver being connected to a first end of a separate actuator coil (313, 315, 317) , wherein a second end of each actuator coil is tied together to form a common end, said actuator drivers each being connected to a supply voltage Vcc and ground. A variable voltage supply (319) is connected to the common end of the actuator coils for varying the voltage applied to the common end of the actuator coils. A feedback unit (303, 307, 311) is connected to each of the plurality of actuator drivers, wherein each of the feedback units measures the current voltage being supplied to the second ends of the actuator coils and compensates the voltage applied to the first end of the actuator coil by the actuator driver.