Micro-actuator, head gimbal assembly and disk drive unit with the same

摘要

A HGA includes a slider; a micro-actuator comprising a bottom plate, a moving plate, and two arm plates symmetrically disposed with an axis of the bottom plate as symmetry axis to connect the moving plate and the bottom plate; and at least one piezoelectric pieces to be bonded to the arm plates; and a suspension to load the slider and the micro-actuator. The slider is mounted on and rotated by the moving plate when exciting the at least one piezoelectric pieces. The invention also discloses a structure of the disk drive unit.