Improved Gap Control System Using a Disturbance Observer for Near-Field Recording
スポンサーリンク
概要
- 論文の詳細を見る
In a solid immersion lens (SIL) based near-field recoding (NFR) system which is one of the emerging technologies for next-generation optical data storage systems, it is essential that the air gap between the SIL and the rotating disk is maintained at less than 50 nm without collision in order to obtain the proper coupling efficiency of evanescent waves. To fabricate a reliable near-field air gap servo system, various disturbances such as disk vibration, external shock and overshoot have to be considered, and these possible disturbances have to be prevented effectively. We propose an improved gap servo system using a disturbance observer (DOB), which has a reduced overshoot and rejection performance for the previously mentioned disturbances. The effectiveness of the proposed controller is verified by experimentally. The experiment results, show that the overshoot was reduced using the proposed near-field air gap servo system with a DOB. In the case of the ramp approach mode with and without the hand-over mode in the mode-switching servo, the overshoots were decreased to 50.9% and collision was avoided, respectively. In addition, in the case of the modified approach mode with and without the hand-over mode in the mode-switching servo, the overshoot was decreased to 2.9 and 3.7%, respectively. Consequently, the access time was decreased in each approach case without the hand-over mode using the DOB-based controller. In addition, the disturbance rejection performance of the external shock was improved to 9.11%.
- 2008-07-25
著者
-
Park No-cheol
Center For Information Storage Device Yonsei University
-
Park Young-Pil
Center for Information Storage Device (CISD), Yonsei University
-
Yang Hyun-seok
Center For Information Storage Device Yonsei University
-
Kim Jung-Gon
Center for Information Storage Device (CISD), Yonsei University
-
Park No-Cheol
Center for Information Storage Device, Yonsei University, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, Korea
-
Jeong Jun
Department of Automation System, Dongyang Mirae College, 62-160 Gocheok-dong, Guro-gu, Seoul 152-714, Korea
-
Kang Min-Seok
Center for Information Storage Device, Yonsei University, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, Korea
-
Kwon Tea-Wook
Center for Information Storage Device, Yonsei University, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, Korea
-
Yang Hyun-Seok
Center for Information Storage Device, Yonsei University, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, Korea
関連論文
- W1 Small Form Factor Information Storage Devices for Mobile Applications in Korea
- P-OPT-04 Optimal Design of Dynamic Vibration Absorber Using L-Shaped Beam for Reducing Optical Disk Drive Vibration(Optical Storage/Optical Devices for Storage,Technical Program of Poster Session)
- Design of a Super-Paraboloidal Solid Immersion Mirror for Near-Field Recording
- Coupled-Field-Analysis and Dynamic Improvement of Ultraslim Optical Pickup Actuator
- Aspherical Solid Immersion Lens of Integrated Optical Head for Near-Field Recording
- P-OPT-06 Design of Moving Magnet Type Actuator Considering Effect of Coil Electromagnet(Optical Storage/Optical Devices for Storage,Technical Program of Poster Session)
- OPT-05 FEASIBILITY ANALYSIS IN THE APPLICATION OF RADIALLY POLARIZATION TO NEAR-FIELD OPTICAL MICROSCOPY(Optical Storage/Optical Devices for Storage II,Technical Program of Oral Presentations)
- OPT-04 HIGH RESOLUTION SOLID IMMERSION LENS-BASED NEAR-FIELD OPTICS WITH AN ANNULAR APERTURE(Optical Storage/Optical Devices for Storage II,Technical Program of Oral Presentations)
- Investigation of Near-Field Imaging Characteristics of Radial Polarization for Application to Optical Data Storage
- P-OPT-03 An anti-shock control method using an accelerometer and inverse impulse for SIL-based Near Field Recording System(Optical Storage/Optical Devices for Storage,Technical Program of Poster Session)
- OPT-03 Improved Anti-shock Air Gap Control Using Quadrant Q Filter and Dead-zone Nonlinear Controller for SIL-based Near-Field Storage System(Optical Storage/Optical Devices for Storage II,Technical Program of Oral Presentations)
- OPT-02 CONTROLLING DEPTH OF FIELD OF IMAGING SYSTEM USING CODED APERTURE(Optical Storage/Optical Devices for Storage I,Technical Program of Oral Presentations)
- Design of Slider and Suspension for 4 × 1 Probe Array Type Near-Field Scanning Optical Microscope
- P-OPT-05 EVALUATION OF SERVO METHOD DESIGNED FOR THE HOLOGRAPHIC DATA STORAGE SYSTEM(Optical Storage/Optical Devices for Storage,Technical Program of Poster Session)
- Defect vs. Nanocrystal Luminescence Emitted in Si-Implanted SiO_2 Layers
- High-Speed Gap Servo Control for Solid-Immersion-Lens-Based Near-Field Recording System with a Flexible Optical Disk
- Improved Antishock Air-Gap Control Algorithm with Acceleration Feedforward Control for High-Numerical Aperture Near-Field Storage System Using Solid Immersion Lens
- Solid Immersion Lens Optical Head for High-Numerical-Aperture Cover-Layered Incident Near-Field Recording
- Development of Rotary-Type Voice Coil Motor Actuator for Small-Form-Factor Optical Disk Drive
- Design of Hybrid Lens for Compact Camera Module Considering Diffraction Effect
- Development of Integrated Small-Form-Factor Optical Pickup with Blu-ray Disc Specification
- Design of Slider and Suspension for $4\times 1$ Probe Array Type Near-Field Scanning Optical Microscope
- Development of Microlens for High-Density Small-Form-Factor Optical Pickup
- Modal Analysis of Optical Disk Rotating at 15,000rpm Close to a Rigid Wall (Special Issue : Optical Memories)
- A Study on Enhancing Data Storage Capacity and Mechanical Reliability of Solid Immersion Lens-Based Near-Field Recording System
- Improved Gap Control System Using a Disturbance Observer for Near-Field Recording
- Analysis on Effect of External Shock in Near-Field Recording System
- Analysis on Effect of External Shock in Near-Field Recording System
- Effect of Annular Aperture on Solid Immersion Lens-Based Near-Field Recording
- Effect of Elliptical Gaussian Beam in Solid-Immersion-Lens-Based Near-Field Recording Optics
- Design and Analysis of Replicated Solid Immersion Lens for Large Thickness Tolerance in Near-Field Recording
- Development of "L-Shaped" Rotary Voice Coil Motor Actuator for Ultra Slim Optical Disk Drive Using Integrated Design Method based on Coupled-Field Analysis
- Optical Performance Evaluation and Aligning Method for Solid Immersion Lens Assembly with Wedge Plate Lateral Shearing Interferometer
- Aspherical Solid Immersion Lens of Integrated Optical Head for Near-Field Recording
- Novel Pull-In Process Using Input Shaping for Solid Immersion Lens-Based Near-Field Recording System
- Improved Air Gap Controller for Solid Immersion Lens-Based Near-Field Recording Servo System
- Design of Cover-Layer-Incident Dual Layer Near-Field Recording Optics Using Elliptical Solid Immersion Lens
- Angle/Fractal Multiplexing Using $x$–$y$ Galvano Mirror System and New Method of Improving Random-Access Performance
- Novel Cover-Layer-Incident Dual-Layer Near-Field Recording Optics Using Hemispherical Solid-Immersion-Lens