• Title/Summary/Keyword: 광디스크 드라이브

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Critical-speed Increase of Optical Disk by Applying Residual Stresses (잔류응력 부과에 의한 광디스크의 임계속도 증가)

  • Kim, Nam Woong;Na, Sang Sik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.5
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    • pp.2092-2099
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    • 2013

  • Through the data transfer race in industry since 1990s, the operational speed of optical disk drive(ODD) becomes commonly over 10,000 rpm. Such high speed operation inevitably causes the vibration, which is also the disturbances in the read-write process of pick-up servo-controller. Generally the vibration disturbance problem can be solved by the vibration isolation using the rubber mount and the increase of robustness of the pick-up servo-controller. Optical disk itself has not been targeted for the vibration reduction, because it is manufactured under the standardized format. In this paper we focused on the increase of critical speed of optical disk, that is, the improvement of dynamic characteristics, with the control of residual stresses which are come from the injection molding process. To do this, first, the residual stresses induced from the injection molding process are calculated using finite element method. The major design parameters of the process conditions are flow rate and melt temperature, which control the residual stresses in optical disk. Second, the critical speed of optical disk is calculated with modal analysis considering residual stress distributions. It was found out that the critical speed can be improved by the control of operational parameters in the injection molding process.

  • https://doi.org/10.5762/KAIS.2013.14.5.2092 인용 PDF KSCI

Track-Following Control for High-Speed Optical Disk Drives (고배속 광 디스크 드라이브 시스템의 트랙 추종 제어)

  • Cho, Seong-Il;Jin, Ju-Hwa;Jung, Soo-Yul;Seo, Joong-Eon;Shin, Dong-Ho
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2008-2010
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    • 2001

  • 최근에 광 디스크 기기의 고배속화에 따라서 디스크의 재생 속도는 점차로 증가하고 있다. 이러한 경향에 따라 트랙킹 제어 루프에서 나타나는 디스크의 편심에 의한 외란의 영향은 더욱 커지게 되므로 기존의 선형 제어기만으로는 디스크의 편심량이 큰 경우에 고배속에서 원하는 트랙 추종 성능을 얻을 수가 없다. 본 논문에서는 이러한 문제점을 해결하기 위해서 반복 학습 제어 알고리즘과 드라이브 시스템의 액츄에이터의 주파수 응답 특성을 이용한 새로운 트랙 추종 제어 방법을 제안한다. 또한, 제안된 트랙 추종 제어 시스템의 제어 성능을 실험을 통하여 검증하여 본다.

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