High-Speed and Precise Gap Servo System for Near-Field Optical Recording
High-Speed and Precise Gap Servo System for Near-Field Optical Recording
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DOI：
10.1143/jjap.51.08ja04
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发表时间：
2011-07
影响因子：
1.5
通讯作者：
D. Koide;T. Kajiyama;H. Tokumaru;Y. Takano;Yuta Nabata;Tokoku Ogata;T. Miyazaki;K. Ohishi
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文献类型：
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作者：
D. Koide;T. Kajiyama;H. Tokumaru;Y. Takano;Yuta Nabata;Tokoku Ogata;T. Miyazaki;K. Ohishi
提出了一种基于前馈控制方法的高速高精度间隙伺服控制系统，该方法可以减少固体浸没透镜近场光学记录系统中的谐波干扰。厚度为1.2 mm的光盘旋转时的轴向跳动约为30 µmp-p。轴向跳动阻止间隙伺服机构在高转速下精确执行。RHD-FFC方法可以抑制间隙误差信号的谐波干扰，并且可以在高速下执行，同时保持光学头和旋转盘表面之间的间隙长度小于25 nm。我们证实，应用RHD-FFC方法的差距伺服精确地执行，并且在11000 rpm的高盘旋转速度下实现，具有1.2 mm厚的光盘，轨道间距为0.16 µm，对应于100 Gbyte的数据容量。
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 µmp–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 µm, corresponding to a data capacity of 100 Gbyte.