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진경복 한국기술교육대학교 2003 論文集 Vol.10 No.1
Optical axis misalignment, which represents the position deviation of the objective lens from the optical axis, is an inevitable assembling error in an optical pick-up. Since the laser power intensity varies with 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 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 a series of experiments.