Study on Dual-Lenses Actuator for HD-DVD System

차세대 DVD 시스템용 Actuator 연구

  • 김석중 (삼성전자(주) DM 연구소 Media Solution Team) ;
  • 이용훈 (삼성전자(주) DM 연구소 Media Solution Team) ;
  • 안영만 (삼성전자(주) DM 연구소 Media Solution Team) ;
  • 정종삼 (삼성전자(주) DM 연구소 Media Solution Team)
  • Published : 2002.11.01


Recently, an optical disc system has been proposed using blue laser diode, high NA objective lens and groove only disc structure. A new method is needed to readout CD and DVD in this blue system. In order to readout CD and DVD in HD-DVD system, we adopted dual-lenses actuator in consideration of optical utilization efficiency, optical performance and insurance of sufficient W.D (working distance). This dual-lenses actuator has two objectives in radial direction, one is for CD/DVD and the other is for HD-DVD. We had to solve the induced problems of DC tilt increase, $2^{nd}$ resonance deterioration and AC sensitivity drop caused by disposing two lenses in an actuator. Especially, to solve AC sensitivity drop, we introduced two 2-pole magnets and separated focus and track magnetic circuits. Consequently we presented that dual-lenses actuator has been possessed good performance. And we measured eye patterns of CD, DVD and HD-DVD by using HD-DVD optical pick-up with dual-lenses actuator.