Abstract
Small-form-factor optical data storage devices are being developed rapidly nowadays. In the case of a CF-II-type optical data storage device (43×36×5 mm3), its components such as the disk, head, focusing actuator, and spindle motor should be assembled within a 5 mm thickness. Since the thickness specification is tight, each component should be designed to have a small thickness. In this paper, a Halbach magnet array is proposed for the focusing actuator. The proposed Halbach magnet array has the advantage of a thin actuation structure without sacrificing flux densities due to its special magnet array feature that increases the magnetic flux on one side without using a yoke. By finite element method (FEM) analysis, flux density, actuation force and actuator thickness are compared with those of conventional methods. Each dimension of the array is obtained to achieve higher performances. Finally, the working range and the resolution of the focusing actuator are experimentally obtained to verify the feasibility of the proposed idea.
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