Feed-forward tracking servo system for high-data-rate optical recording

Koide, Daiichi; Yanagisawa, Hitoshi; Tokumaru, Haruki; Okuda, Haruo; Ohishi, Kiyoshi; Hayakawa, Yasuhiro

doi:10.1109/omods.2002.1028662

Cited by 8 publications

(11 citation statements)

References 3 publications

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“…is not possible to obtain a future value of the error signal, there is little change in the tracking error signal in one rotation at any point on the optical disk from that for an adjacent track in an optical disk drive, so the error signal can be regarded as a periodic function that is dependent on the rotation of the disk. Therefore, by recording the error signal proceeding from the d sample of the previous rotation and substituting that value as a predictive value, the introduction of a feed-forward control system becomes feasible [4][5][6].…”

Section: Application Of Feed-forward Control To An Optical Diskmentioning

confidence: 99%

“…Here, the pre-compensator requires a future input signal, which is two samples ahead (i.e.d = 2) because the order of denominator of transfer function about an actuator model is two more than the order of numerator of that, and the order of denominator of the transfer function about the feedback controller of phase-compensator is same as the order of numerator of that [4,5]. For acquiring the future value, the tracking error signal at a time before the previous disk rotation period is regarded as the future value, because the eccentric component caused by removable optical disk media typically appears in the tracking error signal periodically as the disk rotates.…”

Section: Configuration Of Zpet-ff Control Systemmentioning

confidence: 99%

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Servo techniques for optical disk drives —high‐speed and precise optical beam‐positioning control—

Koide¹,

Tokumaru²,

Miayazaki³

et al. 2009

IEEJ Transactions Elec Engng

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We introduce advanced servo techniques for optical disk drives. High speed and precise optcal beam-positioning and following controls are required archival memories such as high density and high data transfer rate optical disk drives for recording many data and high quality moving pictures toward next generation systems. The zero phase error tracking-feedforward (ZPET-FF) control method is effective for the next generation systems, which have high disk rotation speed beyond the limit of 10,000 rpm of optical disk drives such as current CDs, DVDs or Blu-ray discs.  Toshimasa Miyazaki (member) was born on December 8,

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Section: Application Of Feed-forward Control To An Optical Diskmentioning

confidence: 99%

Section: Configuration Of Zpet-ff Control Systemmentioning

confidence: 99%

Servo techniques for optical disk drives —high‐speed and precise optical beam‐positioning control—

Koide¹,

Tokumaru²,

Miayazaki³

et al. 2009

IEEJ Transactions Elec Engng

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show abstract

“…The servo systems of optical pickups have wide servo bandwidths, and the steep phase shifts of the resonance have a small effect on the stability of the systems (2)- (4) . However, servo systems of mobile camera modules have relatively narrow servo bandwidths and the resonant frequencies are relatively higher.…”

Section: Introductionmentioning

confidence: 99%

Lens Position Control System Using Limited Pole Placement Method

Urakawa

2017

IEEJ Journal IA

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Recently, image sensors for mobile phones have significantly improved, and lens position control is needed for the autofocus actuator of the mobile camera module to realize a robust and precise focus system. The lens position control system is a highly resonant system because the lenses are held by small springs in narrow spaces. In this paper, a digital servo controller for the mobile camera module is discussed. First, continuous control systems are studied for various servo bandwidths with respect to the resonant frequency. Next, three pole assignment methods, 1) multiple poles, 2) a coefficient diagram method, and 3) an optimal controller, are discussed. Third, the limited pole placement method is applied to design a digital controller to suppress the vibration that comes from delay of a system. Finally, a feedforward controller is also investigated to obtain a smooth response for the reference signal. We confirmed that the highly resonant system can be controlled smoothly enough for autofocusing, using the limited pole placement method and the feedforward controller.

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“…A number of systems have been proposed for suppression of periodic disturbances, including: a robust feedback control system based on coprime factorization with a disturbance observer [10] and feedforward control systems based on the zero phase error tracking control (ZPET) [7,[11][12][13]. The effectiveness of these systems was confirmed experimentally.…”

Section: Introductionmentioning

confidence: 99%

Achievement method of high‐speed response of error prediction tracking control for optical disk system

Hayano

Shibutani

Ohishi

et al. 2009

Electrical Engineering Japan

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SUMMARYThis paper proposes the new design method of errorprediction control systems combining the ZPET control and the robust feedback control. The error-prediction control system based on ZPET control can reduce the tracking error caused by periodic disturbances more efficiently than the conventional repetitive control technique. However, the proposed tracking servo system does not reduce the residual tracking error caused by the low-pass filter of the feedforward compensation and by the long sampling time. In order to overcome this problem, this paper proposes the new structure of the feedforward tracking control system. The modified ZPET control tracking servo system for optical disk recording system does not include the low-pass filter and its sampling time becomes faster. On the other hand, the sudden disturbance observer reduces the influence of nonperiodic disturbances. The experimental results point out that the proposed tracking servo system has a precise tracking response against both the periodic disturbances and the nonperiodic disturbances.

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Feed-forward tracking servo system for high-data-rate optical recording

Cited by 8 publications

References 3 publications

Servo techniques for optical disk drives —high‐speed and precise optical beam‐positioning control—

Servo techniques for optical disk drives —high‐speed and precise optical beam‐positioning control—

Lens Position Control System Using Limited Pole Placement Method

Achievement method of high‐speed response of error prediction tracking control for optical disk system

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