DYNAMICALLY SYMMETRIC ACTUATOR

摘要

A dynamically symmetric actuator (56-1) is disclosed for reducing off-track motion. The dynamically symmetric actuator (56-1) of the present invention limits torsional or twisting motion of the actuator arm (120) which reduces off-track motion. In one embodiment, the actuator arm (120) includes a thickness step (134) designed to balance stiffness of inner and outer portions (126, 128) of the actuator arm (120). The thickness step (134) forms multi-thickness tiers, the dimensions of which can be modeled to optimize a first bending mode frequency of the actuator arm (120) to further reduce off-track motion or errors.