Optical axis auto-adjustment of objective lens in optical disc drives

Jung Rae Ryoo, Jung Ho Moon, Jupil Cho

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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-errorrate 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.

Original languageEnglish
Pages (from-to)558-563
Number of pages6
JournalJournal of Institute of Control, Robotics and Systems
Volume14
Issue number6
DOIs
StatePublished - Jun 2008

Keywords

  • Auto-adjustment
  • Objective lens
  • Optical axis
  • Optical disc drive

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