Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Optical Axis Auto-adjustment of Objective Lens in Optical Disc Drives

광디스크 드라이브에서의 대물렌즈 자동광축보정

  • 유정래 (서울산업대학교 제어계측공학과) ;
  • 문정호 (강릉대학교 전자공학과) ;
  • 조주필 (군산대학교 전자정보공학부)
  • Published : 2008.06.01
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Abstract

Optical axis misalignment, which represents the position deviation of the objective lens from the optical axis, is an inevitable assembly error in an optical pick-up. Since the laser power intensity varies with respect to the distance from the optical axis, the misalignment leads to variation of the laser spot power intensity, which is one of the critical factors increasing data bit-error-rate in optical disc drives. In this paper, an auto-adjustment scheme for optical axis alignment is proposed to eliminate the undesirable variation of the laser spot power intensity in optical disc drives. An envelope of the data RF signal is extracted and utilized to detect the optical axis misalignment. Then an adjustment input is added to the driving input of the tracking actuator to shift the objective lens to the optical axis. Finally, the feasibility is verified by experiments.

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References

  1. M.-N. Lee, J.-H. Moon, K. B. Jin, and M. J. Chung, "Robust H$\infty$ control with multiple constraints for the track-following systems of an optical disk drive," IEEE Trans. Ind. Electr., vol. 45, no. 4, pp. 638-645, 1998 https://doi.org/10.1109/41.704893
  2. J.-H. Moon, M.-N. Lee, and M. J. Chung, "Repetitive control for the track-following servo system of an optical disk drive," IEEE Trans. Contr. Syst. Techn., vol. 6, no. 5, pp. 663-670, 1998 https://doi.org/10.1109/87.709501
  3. T.-Y. Doh, J. R. Ryoo, and M. J. Chung, "Design of a repetitive controller: an application to the track-following servo system of optical disk drives," IEE Proc.-Contr. Theory Appl., vol. 153, no. 3, pp. 323-330, 2006 https://doi.org/10.1049/ip-cta:20045217
  4. 유정래, 문정호, 진경복, 정명진, "고배속 광디스크 드라이브 트랙 추종 제어 시스템에서의 외란 관측기를 이용한 점근적 외란 제거," 제어.자동화.시스템공학 논문지, vol. 10, no. 5, pp. 402-410, 2004
  5. J. R. Ryoo, T.-Y. Doh, and M. J. Chung, "Compensator design for a dual-stage actuator in the track-following servo system of optical disk drives," IEEE Trans. Consum. Elec., vol. 51, no. 2, pp. 471-477, 2005 https://doi.org/10.1109/TCE.2005.1467989
  6. H. Yasuhiro and S. Hiroshi: U.S. Patent 5610886, 1997
  7. T. Shihara, K. Watanabe, S. Kadowaki, and H. Ishibashi, "Lens Shift Correction in Tracking Servo System for Digital Versatile Rewritable Disc," Jpn. Jour. Appl. Phys., vol. 39, no. 2B, pp. 840-842, 2000 https://doi.org/10.1143/JJAP.39.840
  8. T. H. Akkermans and S. G. Stan, "Digital servo IC for optical disc drives," Contr. Eng. Pract., vol. 9, no. 11, pp. 1245-1253, 2001 https://doi.org/10.1016/S0967-0661(01)00070-3
  9. A. B. Carlson, Communication Systems, Englewood Cliffs, NJ: McGraw-Hill, 1986

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