Robust Adjacent Track Servo System with Linear Positioning Method

Urakawa, Yoshiyuki; Deoka, Yoshihiko; Suzuki, Yuichi; Mukasa, Tomoharu; Horigome, Junichi

doi:10.1143/jjap.51.08ja02

Jpn. J. Appl. Phys.

2012

DOI: 10.1143/jjap.51.08ja02

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Robust Adjacent Track Servo System with Linear Positioning Method

Yoshiyuki Urakawa¹,

Yoshihiko Deoka²,

Yuichi Suzuki³

et al.

Abstract: A multilayer disk without a guide groove can be a large-capacity and price-competitive optical disk. We propose a novel tracking servo system that is robust and accurate for disks without grooves. We use only one reference layer for which the linear positioning method is employed, which enables us to obtain tracking servo information over the whole disk radius. We also use an adjacent track servo system so as not to overwrite the previous track. We confirm the stability and performance of the system with a sim… Show more

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Cited by 3 publications

References 17 publications

(18 reference statements)

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High-speed focus servo control system using Nyquist aperture mounted on a triaxial actuator for holographic disc drive system

2020

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We have developed a holographic data storage system using angular-multiplexing recording that has a large capacity of 2 TB and a data transfer rate of 1 Gbit∕s. To read a hologram recorded on a holographic disc at high speed, it is necessary to control the relative position shift between a hologram recorded on a disc and a readout optical system. However, in angularmultiplexing data storage systems, the optical system has no moving mechanism, unlike conventional optical discs such as Blu-ray Discs™. Therefore, it is difficult to control the disc position with high precision and to reduce the settling time of the positioning because the holographic disc has no physical structure for the position control mechanism to control the relative position shift. In the systems, a disc mounted on a disc stage is moved to a position where the signal-tonoise ratio of the reproduced hologram becomes the maximum value. Hence, we present a servo control system based on a shift of the Nyquist aperture using a real-time position error signal to control the disc position. In experiments, a positioning accuracy of AE15 μm and a settling time of 8.5 ms for our angular-multiplexing data storage system using a nonlinear parabolic focus position error signal have been observed. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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High-speed focus servo control system using Nyquist aperture mounted on a triaxial actuator for holographic disc drive system

2020

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Decoupled direct tracking control system based on use of a virtual track for multilayer disk with a separate guide layer

Tanaka

Ogata

Imagawa

2015

Jpn. J. Appl. Phys.

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We developed a decoupled direct tracking control system for multilayer optical disk that uses a separate guide layer. Data marks are recorded on a recording layer immediately above the guide layer by using two spatially separated spots with different wavelengths. Accurate data mark recording requires that the relative positions of the corresponding spots on the recording layer and guide layer are maintained. However, a disk tilt can shift their relative positions and cause previously recorded data marks to be overwritten. Additionally, a two-input/two-output control system is susceptible to mutual interference phenomenon between the two outputs, which can destabilize tracking control. A tracking control system based on use of data marks previously recorded as a virtual track has been developed that prevents spot shifting and mutual interference even if the disk tilt reaches 0.7°, thereby preventing overwriting.

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Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

Ohashi¹,

Yoshida²,

Ohishi³

et al. 2015

Jpn. J. Appl. Phys.

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The size of digital content has been on the increasing in recent times, and this has been led to the need for correspondingly scaling up the capacity of digital storage media. Therefore, a high-precision focusing and tracking control system are required for an optical disk. A pickup system for optical disks operates in the horizontal and vertical directions for tracking and focusing, respectively. Thus, this paper proposes a new single-rate two-dimensional feedforward control system, which is the concurrent control of focusing and tracking. The feedforward controller is based on a zero phase error tracking (ZPET) control. Experimental results show the effectiveness of the proposed control system.

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Robust Adjacent Track Servo System with Linear Positioning Method

Cited by 3 publications

References 17 publications

High-speed focus servo control system using Nyquist aperture mounted on a triaxial actuator for holographic disc drive system

High-speed focus servo control system using Nyquist aperture mounted on a triaxial actuator for holographic disc drive system

Decoupled direct tracking control system based on use of a virtual track for multilayer disk with a separate guide layer

Single-rate two-dimensional feedforward control system for optical disk systems in consideration of the phase delay

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