抄録
An access mechanism for achieving high-speed head positioning for optical disk drives was developed. The carriage acceleration reached 240m/s^2 while the compact size was maintained. The performance and small size was achieved by developing voice coil motors with multi-pole magnetic circuits and a five-element driving coil assembly. Compared to the conventional single-pole actuators of the same thickness, the actuator force constant was doubled. Size was also minimized by having the lower yokes of the magnetic circuits serve as roller-guide surfaces.
