PID Method for Flying Height Control of Pickup Head in Near-Field Optical Disk Drive

• Main Authors: Wu, Chun-Hsing, 吳俊星
• Other Authors: Lui, Tzong-Shi
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/16380050311368629759

碩士 === 國立交通大學 === 工學院精密與自動化工程學程 === 101 === This thesis uses a PID controller to control the pickup head flying height in a near-field optical disk drive. Near-field optical theory applied to an optical pickup head can improve optical disk drive storage capacity. In order to achieve near-field optical recoding, the distance between the objective lens and disk surface, i.e. the flying height must keep within the range of sub-wavelength. In such small flying clearance, head disk crash risk will become higher and higher. This study uses National Instrument sbRIO-9602 embedded device using closed-loop control voice coil motor by the PID method to reduce the flying height variation induced by media waviness under critical clearance. The result successfully avoids the pickup head to crash media surface and reduces the flying height to 750nm.