Title :
Improved Air-Gap Control for SIL-Based Near-Field Recording System
Author :
Kim, Joong-Gon ; Kim, Tae-Hun ; Choi, Hyun ; Yoon, Yong-Joong ; Jeong, Jun ; Park, No-Cheol ; Yang, Hyunseok ; Park, Young-Pil
Author_Institution :
Center for Inf. Storage Device, Yonsei Univ., Seoul
Abstract :
We propose a gap servo method to reduce the overshoot in the near-field (NF) region. In general, we use a mode-switching servo which consists of approach, hand-over, and gap-control modes. However, there is a critical problem, such as an overshoot at the turning point from the approach mode to the hand-over mode, which may cause a collision between the SIL and the disk. In this paper, we propose an improved NF gap servo system using an exponential input in the approach mode which can reduce the overshoot and settling time of the mode-switching servo
Keywords :
air gaps; lenses; optical disc storage; servomechanisms; SIL-based near-field recording system; air-gap control; approach mode; exponential input; gap servo system; mode-switching servo; optical data-storage device; optical disk storage; overshoot; settling time; Air gaps; Control systems; Lenses; Noise measurement; Optical devices; Optical polarization; Optical recording; Optical refraction; Servomechanisms; Storage automation; Gap error signal (GES); mode-switching servo; near-field recording (NFR); overshoot;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.888426
