Servo Technologies in a Near-Field Optical Disk Drive System
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概要
- 論文の詳細を見る
A near-field optical disk drive (NFDD) system has been predicted as a storage system with a capacity higher than 100 Gbytes in a 12-cm-sized disk and with a data transfer rate higher than 100 Mbps. The major advantage of an NFDD system with a solid immersion lens is that it is possible to utilize the technologies accumulated through conventional optical drive systems. However, the working distance in an NFDD system is only 25 nm or less, which is much smaller than that in a conventional optical disk drive system. The nano-working distance must be successfully maintained without regard to any tilts over the entire disk radius. In this study, we discuss the servo technologies in the NFDD system by focusing on the tilt servo technology which contributes to the stable gap servo performance over the entire disk radius. First, we evaluate the tilt in the NFDD system by utilizing the optically detected tilt error. Second, we propose specifications for an NFDD system on the basis of the results. We also report a tilt servo system that satisfies the specifications and discuss its effect from the viewpoint of drive performance over the entire disk radius. In addition, we suggest a novel gap servo technology utilizing the tangential tilt information and discuss its performance.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-07-25
著者
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Kondo Takao
Optical Disc Development Division Av/it Development Group Sony Corporation
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Ishimoto Tsutomu
Optical Disc Development Division Av/it Development Group Sony Corporation
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Nakaoki Ariyoshi
Optical Disc Development Division Av/it Development Group Sony Corporation
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Mizukuki Takeshi
Optical Media Laboratory, Material Laboratories, SONY Corporation, 4-14-1 Asahi-cho, Atsugi, Kanagawa 243-0014, Japan
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Kim Sunmin
Optical Media Laboratory, Material Laboratories, SONY Corporation, 4-14-1 Asahi-cho, Atsugi, Kanagawa 243-0014, Japan
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Kawakubo Osamu
Optical Media Laboratory, Material Laboratories, SONY Corporation, 4-14-1 Asahi-cho, Atsugi, Kanagawa 243-0014, Japan
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Nakaoki Ariyoshi
Optical Media Laboratory, Material Laboratories, SONY Corporation, 4-14-1 Asahi-cho, Atsugi, Kanagawa 243-0014, Japan
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Ishimoto Tsutomu
Optical Media Laboratory, Material Laboratories, SONY Corporation, 4-14-1 Asahi-cho, Atsugi, Kanagawa 243-0014, Japan
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Kondo Takao
Optical Media Laboratory, Material Laboratories, SONY Corporation, 4-14-1 Asahi-cho, Atsugi, Kanagawa 243-0014, Japan
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- Analysis of Near-Field Readout Characteristics Using Approximate Vector Diffraction Calculation
- Servo Technologies in a Near-Field Optical Disk Drive System
- High-Density Near-Field Readout over 50 GB Capacity Using Solid Immersion Lens with High Refractive Index
- Approach of Improving Disk Performance to High-Quality Gap Control in Near-Field Optical Disk Drive System