Feed-forward robust controller design with ZPETC-PDF method for seesaw type swing arm actuator

A micro holographic optical pickup head is designed to miniaturize the optical configuration which provides a better approach for portable application. This optical module is then mounted on the seesaw type swing arm actuator for focusing and tracking operation in small form factor optical disk drive. In high-speed tracking and high track density servo system, the conventional feedback control system, such as Lead-Lag control, is not enough to reduce residual tracking error and reject the disturbance interference. For this reason, we presented a method that using the zero phase error tracking (ZPET) control to improve the system performance such as the transient response and system bandwidth, also combined with Pseudo-Derivative Feedback (PDF) control block to provide stiffness and overcome low frequency disturbances, such as friction.