Search Results:　 1-20 of 171

1

Short Span Seeking Control System of Hard Disk Drives Considering Pivot Friction [in Japanese]

KAWAFUKU Motohiro , IWASAKI Makoto

本論文では,ピボット軸受け周りの摩擦外乱を補償した高精度なショートスパンシーク制御を提案する。制御系の構成は2自由度制御系を用い,フィードバック制御ではフォロイング制御時におけるピボット軸摩擦の影響を考慮しオブザーバを用いた補償を,位置指令生成法としては完全追従制御法を用いたショートスパンシーク動作時の摩擦補償について考慮した。提案手法の有効性については,数値シミュレーションと実機実験によって検証 …

IEICE technical report. Magnetic recording 110(310), 23-28, 2010-11-19

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2

Development of microscopic Kerr effect magnetometry using reflection objective [in Japanese]

KONDO Yuji , YAMAKAWA Kiyoshi , NAKAMURA Yuki , ISHIO Shunji , ARIAKE Jun

ビットパターン媒体などの硬磁性ナノ構造体の磁気計測を目的として,強磁場中においても偏光軸に影響が少ない反射型結像鏡を採用した顕微カー効果磁気計測装置の開発を行った.反射型結像鏡には極めて単純な球面鏡のみで構成されたSchwarzschild結像鏡を用いた.この結像鏡の結像式から3次の球面収差を打ち消す条件を用いて,倍率200倍の光学パラメータの解析設計を行った.光線追跡法により結像評価を行った結果 …

IEICE technical report. Magnetic recording 110(225), 65-69, 2010-10-07

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3

Zero Phase Error Tracking Control System with Harmonics Disturbance Suppression Loop [in Japanese]

KAMIGAKI Yoshiya , OHISHI Kiyoshi , NABATA Yuta , OGATA Tokoku , MIYAZAKI Toshimasa , KOIDE Daiichi , TAKANO Yoshimichi , TOKUMARU Haruki

電気学会研究会資料. IIC, 産業計測制御研究会 2010(88), 35-40, 2010-03-09

References (5)
4

Stable Peak Filtering Method to Reject High Frequency Disturbance in Hard Disk Drives

HONG Fan , DU Chunling

… The resulting closed-loop systems can provide large gain attenuation at the resonance frequency, and thus have more disturbance rejection capability. …

Journal of Advanced Mechanical Design, Systems, and Manufacturing 4(1), 119-129, 2010

J-STAGE CrossRef
5

Modeling and Control of a Dual Stage Actuator Hard Disk Drive

BOETTCHER Uwe , CALLAFON Raymond A. DE , TALKE Frank E.

… Based on the discrete-time models, different dual-stage track-following controllers were designed using classic and H∞ loop shaping techniques. …

Journal of Advanced Mechanical Design, Systems, and Manufacturing 4(1), 107-118, 2010

J-STAGE CrossRef
6

PID Controller Design for Nano Motion Actuator(Mechanical Systems) [in Japanese]

NAGANAWA Akihiro , HIRAMOTO Kazuhiko , FURUYA Masato , SHIBUYA Yotsugi , MORI Shigeki

… A conventional spin-stand system which used to evaluate read-write performance of magnetic recording heads and media can not allow thermal drift of its mechanism and NRRO (non-repeatable run out) of its air spindle motor. … At first, we discussed about a model matching problem of an open loop transfer function and decided PID gains from physical parameters of the NMA. …

Transactions of the Japan Society of Mechanical Engineers. C 75(754), 1770-1776, 2009-06-25

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7

FMF-05 PIEZO-ELECTRICALLY ACTUATED HIGH BANDWIDTH VIBRATION COMPENSATION FOR MOVING MEDIA(Flexible Media Feeding and Handling Machines I,Technical Program of Oral Presentations)

Kartik V. , Lantz M.A. , Eleftheriou E.

… Lateral vibration of the magnetic medium in tape data storage applications misaligns the flexible medium relative to the recording head and reduces the potential for reducing data track width and spacing, and thereby the achievable data storage density. … The recording head is, therefore, mounted on an actuation mechanism that 'tracks,' or compensates for, the lateral vibration in order to reduce the effect of the relative misalignment between the medium and the head. …

Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2009, 139-140, 2009-06-17

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8

SVC-K ROBUST ESTIMATION AND ADAPTIVE CONTROLLER TUNING FOR VARIANCE MINIMIZATION IN SERVO SYSTEMS(Servo Control II,Technical Program of Oral Presentations)

de Callafon Raymond A.

… In this document it is shown how a standard (PID) servo control algorithm can be augmented with an additional feedback loop that can be tuned automatically by estimating the actual disturbance spectra seen in the PES. …

Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2009, 75-79, 2009-06-17

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9

SVC-03 STABLE PEAK FILTERING METHOD TO REJECT HIGH FREQUENCY DISTURBANCE IN HARD DISK DRIVES(Servo Control I,Technical Program of Oral Presentations)

HONG Fan , DU Chunling

… The resulting closed-loop systems can provide large gain attenuation at the resonance frequency, and thus have more disturbance rejection capability. …

Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2009, 69-70, 2009-06-17

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10

Analysis of Magnetic Cluster Size Distributions from AC Erased Noise Spectra [in Japanese]

HASHIMOTO M. , NAKAGAWA H. , NAKAMOTO K. , IDE H.

… This trend agrees well with the results obtained from the minor loop analysis. … This method is useful for developing media because measuring is easy, fast, and can be used for various kinds of recording media under a variety of conditions. … The relationship between transition jitter and the average magnetic cluster size revealed that reducing the cluster size distribution while keeping writability high was important to achieve high areal density recording. …

Journal of the Magnetics Society of Japan 33(3), 216-221, 2009-05-01

J-STAGE CrossRef References (14)
11

A Study of 2D Laser Scanning Actuator for LCD Backlight [in Japanese]

OKAGAKI Satoru , NIIKURA Eiji , YOKOYAMA Eiji , MICHIMORI Atsushi , SUGIURA Hiroaki

液晶ディスプレイ(Liquid Crystal Display: LCD)パネルのバックライト光源をレーザとし,さらにパネル背面に照射された光スポットを2次元スキャンするシステムの構成について報告する.2次元スキャンアクチュエータは,映像信号に同期し,かつLCDパネルの画素遷移特性を考慮したタイミングで,光スポットを等速度にてスキャンし,パネル全面を照明する機能を持つ.水平方向スキャンはポリゴンミ …

IEICE technical report. Magnetic recording 108(380), 31-34, 2009-01-08

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12

Analysis of the Magnetic Properties of Discrete Track Media by the Ion Irradiation Method

Yasumori J. , Aniya M. , Shimada A. , Sonobe Y. , Greaves S. J. , Miura K. , Muraoka H. , Takagi T. , Takeuchi Y.

… The magnetic properties of perpendicular magnetic recording media after ion irradiation modification were studied. … Examination of the Kerr loop of the line-and-space pattern after ion irradiation revealed that the coercivity and nucleation field were reduced, and the loop shape was similar to the sum of the loops between the magnetic film has ion irradiated and the resist stopped ions was observed by MOKE. …

Journal of the Magnetics Society of Japan advpub(0), 0910050045, 2009

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13

An Experimental Study of Head Instabilities in TMR Sensors for Magnetic Recording Heads with Adaptive Flying Height

TONGSOMPORN Damrongsak , AFZULPURKAR Nitin , BARGMANN Brent , LEKAWAT Lertsak , SIRITARATIWAT Apirat

… The slider head consists of a small heater nearby the read/write elements for controlling the clearance between the read/write elements and the recording medium of the magnetic recording system. … The thermal stress degrades the reader performance by inducing voltage fluctuations and large noise spikes that causes the magnetic recording system having poor bit error rate (BER). …

IEICE Transactions on Electronics 91(12), 1958-1965, 2008-12-01

J-STAGE CrossRef References (11)
14

Improvement of magnetic and R/W performance by annealing on Co-Pt-TiO_2 granular films for perpendicular magnetic recording media [in Japanese]

ARIAKE Jun , KIYA Takanori , HONDA Naoki

垂直磁気記録媒体用Co-Pt-TiO_2薄膜に熱処理を施し,磁気特性,結晶特性そして記録特性がどのように変化するかを調べた.熱処理温度や熱処理時間により,結晶性および結晶配向性の向上,磁化ループの傾きの急峻化と△H_C/H_Cの低下,記録再生特性の改善など各種の特性改善が見られ,それらが膜構造の均質化に因ることを明らかにした.また,処理温度や処理時間には最適値が存在することが明らかになった.

ITE Technical Report 32(53), 31-36, 2008-11-21

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15

Improvement of magnetic and R/W performance by annealing on Co-Pt-TiO_2 granular films for perpendicular magnetic recording media [in Japanese]

ARIAKE Jun , KIYA Takanori , HONDA Naoki

垂直磁気記録媒体用Co-Pt-TiO_2薄膜に熱処理を施し,磁気特性,結晶特性そして記録特性がどのように変化するかを調べた.熱処理温度や熱処理時間により,結晶性および結晶配向性の向上,磁化ループの傾きの急峻化とΔH_c/H_cの低下,記録再生特性の改善など各種の特性改善が見られ,それらが膜構造の均質化に因ることを明らかにした.また,処理温度や処理時間には最適値が存在することが明らかになった.

IEICE technical report. Magnetic recording 108(313), 31-36, 2008-11-14

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16

Perpendicular Magnetic Recording VII : Chapter 6 Approximation Analysis for Isolated Magnetization Transition Parameters [in Japanese]

NAKAMURA Y.

Magnetics Japan 3(1), 43-51, 2008-01-01

References (15) Cited by (2)
17

Simulation Study of Effect of Dispersions on Recording Performances in Perpendicular Magnetic Recording Media(<Special Section>Recent Progress of High-Density Information Storage)

HONDA Naoki , OUCHI Kazuhiro

… Effect of dispersions of medium parameters and structure on the recording performance was systematically investigated. … Moderately increased M-H loop slope is effective for obtaining higher thermal stability, smaller saturation fields, and higher resolution. …

IEICE transactions on electronics E90-C(8), 1577-1582, 2007-08-01

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18

Easy Axis Alignment of L1_0-FePt Nanoparticles Synthesized by the "SiO_2-Nanoreactor" Method(Thin Films, Fine Particles, Multilayers, and Superlattices) [in Japanese]

Yamamoto S. , Tamada Y. , Ono T. , Takano M.

… The hysteresis loop of the L1_0-FePt nanoparticles solution showed superparamagnetic-like behavior at room temperature due to the free motions of nanoparticles, indicating that the easy axis of the dispersed nanoparticles can be aligned by an application of external magnetic field. …

Journal of Magnetics Society of Japan 31(3), 199-202, 2007-05-01

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19

Comparison of Various Cardiac Event Recorders Clinically Available in Japan [in Japanese]

NAKAMURA Hirofumi , YASUDA Shioto , ODASHIRO Keita , KAJI Yoshikazu , MARUYAMA Toru

… However, the utility in arrhythmia detection, risk and benefit, recording feasibility and cost-effectiveness remain to be resolved. … Conclusively, we would like to address the importance of pre-event segment recording. …

Journal of health science 29, 19-24, 2007-03-31

IR Ichushi Web Cited by (2)
20

2315 Displacement Amplitude Mechanism of Diamond Shape with Piezoelectric Element for High Precise Control [in Japanese]

Mori Shigeki , Sakurada Akira , Sato Yuudai , Ando Hiroki , Naganawa Akihiro , Obinata Goro

… Moreover, as the two piezoelectric elements worked to counterbalance each other's reaction force, the new actuator never excite a spin-stand which was estimation tester for high density magnetic recording. … The optimized design model increased the working-distance dramatically without its declining crossover frequency of the open-loop transfer function. …

Conference on Information, Intelligence and Precision Equipment : IIP 2007, 271-274, 2007-03-19

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