Approach of Improving Disk Performance to High-Quality Gap Control in Near-Field Optical Disk Drive System

Ishimoto, Tsutomu; Kim, Sunmin; Yamasaki, Takeshi; Yukumoto, Tomomi; Nakaoki, Ariyoshi; Yamamoto, Masanobu

doi:10.1143/jjap.46.3981

Cited by 9 publications

(8 citation statements)

References 8 publications

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“…With respect to the disk, we proposed a disk with high damping characteristics instead of a conventional polycarbonate substrate. 7) As the spindle motor for the NFDD system, we developed a high-precision motor with vertical and radial run-out less than 1 mm. 5) We have also improved the mechanical performance of the SIL actuator as the servo objective.…”

Section: Servo Technologies For the Nano-gapmentioning

confidence: 99%

Servo Technologies in a Near-Field Optical Disk Drive System

Ishimoto¹,

Kim²,

Nakaoki³

et al. 2008

jjap

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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.

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Section: Servo Technologies For the Nano-gapmentioning

confidence: 99%

Servo Technologies in a Near-Field Optical Disk Drive System

Ishimoto¹,

Kim²,

Nakaoki³

et al. 2008

jjap

Self Cite

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“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] It can exhibit a large capacity and a highdata transfer rate towards recording next-generation ultrahigh-definition television [i.e., Super Hi-Vision (SHV), 7320 Â 4320 pixels] video signals 17,18) for home-use. Fourfold higher density recording using NFR optical disks with 1.2-mm-thick disks has been reported, 12,14) and studies of larger capacity using multilayer recording using NFR have been reported.…”

Section: Introductionmentioning

confidence: 99%

Recording characteristics of high-density thin optical disk using near-field optical recording

Koide

Kajiyama

Sato

et al. 2014

OPT REV

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We report on the recording characteristics of a near-field optical recording thin optical disk (NFR-TOD). We proposed a new cooling-less-type write strategy for recording, applied it to the NFR-TOD experimental system, and also applied a partial response maximum likelihood (PRML) signal processing, which was evaluated and optimized the PR coefficient for playback signals of the prototype NFR-TOD. The NFR-TOD has a track pitch of 160 nm and improved recording characteristics. The experimental results of the prototype NFR-TOD and the system indicate sufficiently low bit error rates (bERs) for recorded data at a fourfold higher recording density than the current Blu-ray disk.

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“…A near-field optical recording (NFR) system using a solid immersion lens (SIL) 1) has a fourfold higher recording density than the Blu-ray disc system. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Some studies have shown the realization of a large recording capacity using multilayer recording techniques for optical disks, [17][18][19][20][21] but the data transfer rate is limited. The NFR system is expected to realize not only a large capacity but also a high data transfer rate because its numerical aperture (NA) is more than two times higher and the optical beam spot can be less than half the diameter of current Blu-ray optical systems.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Optical Recording Using Solid Immersion Lens for High-Density Flexible Optical Disks

Koide

Kajiyama

Sato

et al. 2013

Jpn. J. Appl. Phys.

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We propose a near-field optical recording flexible optical disk (NFR-FOD) for high-density recording at a high data transfer rate. We built a prototype high-density NFR-FOD that had a track pitch of 0.16 µm and we stacked some recording layers on a thin substrate that was 0.1 mm thick. We rotated the NFR-FOD closing the mechanical stabilizer on a drive system with less than 10 µmp–p axial run-out and achieved precise gap servo operation at a high rotational speed. We demonstrated near-field optical recording with a solid immersion lens with a numerical aperture (NA) of 1.84 on the NFR-FOD. The NFR-FOD has a fourfold higher recording density than the current Blu-ray disc, corresponding to a capacity of 100 Gbytes per layer, and a high data transfer rate of 250 Mbps, while rotating at half the speed.

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Approach of Improving Disk Performance to High-Quality Gap Control in Near-Field Optical Disk Drive System

Cited by 9 publications

References 8 publications

Servo Technologies in a Near-Field Optical Disk Drive System

Servo Technologies in a Near-Field Optical Disk Drive System

Recording characteristics of high-density thin optical disk using near-field optical recording

Near-Field Optical Recording Using Solid Immersion Lens for High-Density Flexible Optical Disks

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