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Halbach magnet array based focusing actuator for small form factor optical storage device

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Abstract

The small form factor optical data storage devices are developing rapidly nowadays. Since it has to be designed to have portability and to have compatibility with flash memory, its components such as disk, head, focusing actuator, and spindle motor should be assembled within 5 mm thickness. In case of focusing actuator, since the thickness is limited tightly, Halbach magnet array is adopted to increase the magnetic flux of one side without yoke . The proposed Halbach array type focusing actuator has the advantage of thin actuation structure without more sacrificing flux density than conventional magnetic array. The optical head unit is moved on the swing arm type tracking actuator. Focusing coil is attached to swing arm, and Halbach magnet array is positioned at the bottom of deck along the tracking line, and focusing actuator exerts force by the Fleming’s left hand rule. The working range and resolution of focusing actuator are analyzed with FEM and experimentally performed.

© 2005 Optical Society of America

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