Dynamic Analysis of Tip-actuators for Controlling Tip-media Gap in Cantilever Type Optical Data Storage

캔틸레버형 광 정보저장에서의 빠른 팁/매체 간극제어를 위한 팁/구동기의 동역학적 분석

Near-filed optical storage using cantilever aperture tip is a promising way fer next generation optical data storage. To enhance the speed of reading and writing data, gap between tip and media should be controlled fast and precisely within near field region. In this paper, several PZT actuators are analyzed far constructing dual servo control algorithm: coarse actuators(stact. PZT, bimorph PZI) for media surface inclination and One actuator(film PZT) for media surface roughness. Dynamic analysis of stack PZT, bimorph PZT, and film PZT are performed through the frequency response. Based on the frequency response and mathematical model, fast analog controller is designed.