Improved Air Gap Controller for Solid Immersion Lens-Based Near-Field Recording Servo System
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概要
- 論文の詳細を見る
The near-field air-gap controller for solid immersion lens (SIL)-based near-field recording (NFR) systems has been required to improve its robustness to dynamic disturbances associated with rotating conditions such as periodic disk resonance and external shock. These dynamic disturbances usually exist in optical disk drive systems as a result of the operating condition. Moreover, SIL based NFR servo systems should be considered to realize stable servo systems because it is essential that the air gap between the SIL and the rotating disk should be less than 100 nm and that the SIL and the disk should be protected. Hence, we propose improved air-gap control methods using internal model principle (IMP)-based and dead-zone nonlinear controllers. To increase air gap control performance with respect to dynamic disturbances, the IMP-based control method, which is one of the improved control methods for eliminating periodic disturbances at some frequencies, is implemented in the original NFR servo system. In addition, in case of anti-shock control performance, the original air gap servo system should be improved in terms of the anti-shock control such that the actuator head with SIL optics has to maintain on extremely small air gap to avoid collision between the SIL and the media when external shock is applied to the NFR system. Consequently, the experimental results show that the gap error signal is reduced by 76% during vibration of the disk using an IMP-based controller, and anti-shock control performance under external shock is improved by 60% using a dead-zone nonlinear controller.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2009-03-25
著者
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Park No-cheol
Center For Information Storage Device Yonsei University
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Park Young-Pil
Center for Information Storage Device (CISD), Yonsei University
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Kim Jung-Gon
Center for Information Storage Device (CISD), Yonsei University
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Park Kyoung-su
Center For Information Storage Device (cisd) Yonsei University
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Yang Hyunseok
Center For Information Storage Device Yonsei University
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Jeong Jun
Department of Automation Systems, Dongyang Technical College, 62-160 Gocheok-dong Guro-gu, Seoul 152-714, Korea
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Jeong Jun
Department of Automation System, Dongyang Mirae College, 62-160 Gocheok-dong, Guro-gu, Seoul 152-714, Korea
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Shin Won-Ho
Center for Information Storage Device, Yonsei University, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, Korea
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