OPT-03 Improved Anti-shock Air Gap Control Using Quadrant Q Filter and Dead-zone Nonlinear Controller for SIL-based Near-Field Storage System(Optical Storage/Optical Devices for Storage II,Technical Program of Oral Presentations)

Abstract

The ultimate aim of this research is to improve the robustness of the air gap controller for solid immersion lens (SIL)-based near-field (NF) servo systems against the external shocks. To detect gap error and read-out signals for the SIL and the disk, the air gap control performance must be increased to avoid collisions due to external shocks. We propose an anti-shock air gap control system using a quadrant Q filter and a dead-zone non-linear controller. Experimental results demonstrate that a quadrant Q filter and a dead-zone non-linear controller maintained the optical head with SIL optics distance for a 4.48 G@10 ms shock. Thus the control performance in the presence of external shocks was improved.