Patent ID: 8514676

Claim:
A method for generating a control voltage for a position actuator of a disk drive system for displacing a lens of a pick-up unit to a given position, wherein the actuator is operated by an open loop control system, said method comprising: receiving an input position signal (Xact_setp); calibration for producing only a single control voltage (Va) from the input position signal (Xact_setp); processing only said single control voltage (Va) in a feed forward system for generating only a single processed control signal (Va_p); feeding only said single processed control signal (Va_p) to said position actuator for displacing said lens to said given position, wherein said calibration calibrates at least one of parameters K, R and C, where K is a property of the actuator in Newtons/Ampere, R is the resistance if the actuator coil in Ohms, C is the spring constant of the actuator in Newtons/meter.