2012年8月
High-Speed and Precise Gap Servo System for Near-Field Optical Recording
JAPANESE JOURNAL OF APPLIED PHYSICS
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- 巻
- 51
- 号
- 8
- 開始ページ
- 08JA04-1
- 終了ページ
- 08JA04-4
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1143/JJAP.51.08JA04
- 出版者・発行元
- JAPAN SOC APPLIED PHYSICS
We propose a high-speed and precise gap servo control system that is based on the feed-forward control method that can reduce the harmonic disturbance (RHD-FFC) on a near-field optical recording system with a solid immersion lens. An optical disk of 1.2 mm thickness rotates with about 30 mu m(p-p) of axial run-out. The axial run-out prevents a gap servo from performing precisely at high rotational speed. The RHD-FFC method can suppress harmonic disturbances of gap error signal and can perform at high speed while keeping less than 25 nm of gap length between an optical head and a rotational disk surface. We confirmed that the gap servo applying the RHD-FFC method performed precisely and achieved at high disk rotational speed of 11000 rpm with a 1.2-mm-thick optical disk with a track pitch of 0.16 mu m, corresponding to a data capacity of 100 Gbyte. (C) 2012 The Japan Society of Applied Physics
- リンク情報
- ID情報
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- DOI : 10.1143/JJAP.51.08JA04
- ISSN : 0021-4922
- Web of Science ID : WOS:000308062300004