Highly precise actuator with PZT and displacement expander for track following

摘要

A spin stand which is used to evaluate read-write performance of magnetic heads and media can not become able to allow thermal drift of its mechanism and run out of its air spindle motor. Accuracy and mechanical stiffness of the spin stand supported the highly precise measurement of the magnetic recording. However, as an allowable tracking error will reach within 10nm, the future spin stand will need track follow with a fine actuator. An actuator which consists of a layered piezoelectric element and a displacement expander is developed and tested. The actuator of a resonance frequency is 11.8 kHz and the performance between a displacement and a voltage is 1.53 μm/V. The actuator that constitutes a piggyback system on a Y stage of the spin stand can seek speedily between some tracks and follow on the narrow track well.