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Vol. 154, Issue 7, July 2013, pp. 174-182




Adaptive Regulation of the Flying Height Based on Hybrid Actuator in Near-field Optical Disk Drives
Yang Li, * Zhizheng Wu, Qingxi Jia, Mei Liu

Department of Precision Mechanical Engineering, Shanghai University, 200072, China

* Tel.: 86-2156331783

* E-mail: zhizhengwu@shu.edu.cn


Received: 28 April 2013   /Accepted: 19 July 2013   /Published: 31 July 2013

Digital Sensors and Sensor Sysstems


Abstract: In the next generation near-field optical data storage systems, higher data transfer rate and higher data density require the optical pickup head to maintain a constant sub-micrometer flying height above the rotating disk surface without any collisions. However, suspension vibration and force disturbance, as well as disk vibration make it difficult to maintain the desired flying height during disk operation in the near-field optical disk drives (ODD). It is proposed in this paper to design a hybrid actuator system which combines both advantages of the flying slide used in hard disk drives and the voice coil actuator used in optical disk drives. Then based on the developed model of the hybrid actuator, an adaptive regulation approach is proposed to regulate the flying height at its desired value, despite the unknown vibrations and the unknown force disturbance. The performance of the proposed approach is analyzed and simulation results are presented to illustrate the capability of the proposed adaptive regulation approach to achieve and maintain the desired flying height.


Keywords: Optical data storage, Near-field, Flying height, Hybrid actuator, Adaptive regulation.


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