抄録
We developed an objective lens actuator using three-polarized magnetic structure for a slim type BD optical pickup.Three magnets are provided opposing to both sides of the moving part of the actuator such that the polarization of the center magnet is reverse to two other outside magnets.Driving forces generated at center portion of a focusing coil opposing to the center magnet cancel deformation of the bending vibration mode of the moving part.Calculated and experimental results show that the higher-order resonance frequency of the actuator is over 20kHz and its amplitude is less than 2dB.
