Abstract
A hybrid type spherical aberration correction mechanism used for multi-layer Blu-ray Disc (BD) optical pickup was developed. To shorten the time to switch recording layers, this mechanism has both an electromagnetic actuator and a screw feeding mechanism. The actuator achieves high-speed operation, and the screw feeding mechanism reduces power consumption by replacing the displacement of the electromagnetic actuator with the screw feeding mechanism. The experimental results showed that the time to switch recording layers was 2/3 or less than that of a conventional spherical aberration correction mechanism using only a screw feeding mechanism.
