AXIAL TYPE OPTICAL PICKUP ACTUATOR HAVING MAGNETIC CIRCUIT

摘要

PURPOSE: An optical pickup actuator having a magnetic circuit is provided improve a driving sensitivity by reinforcing a magnetic field passed a coil. CONSTITUTION: A magnetic closed circuit is formed to enter a magnetic flux from an N polar of a first magnet(134) into an S polar of a third magnet and the magnetic flux from an N polar of the third magnet(140) into an S polar of the first magnet via a coil(120). A fine driving force of focusing direction is generated from the coil. A magnetic closed circuit is formed to enter the magnetic flux from the N polar of the third magnet into an S polar of a fourth magnet(142) and the magnetic flux from an N polar of the fourth magnet into an S polar of a second magnet(136) via the coil. The fine driving force of tracking direction is generated from the coil. An optical pickup actuator is formed the magnetic circuit to circulate the magnetism in a lens holder(110). Thereby, the driving sensitivity of the lens holder is improved by reinforcing the magnetic flux passed the coil.