Halbach array type focusing actuator for small and thin optical data storage device

Sung Q Lee; Kang-Ho Park; Mun Chul Paek

doi:10.1117/12.571511

25 October 2004 Halbach array type focusing actuator for small and thin optical data storage device

Sung Q Lee, Kang-Ho Park, Mun Chul Paek

Proceedings Volume 5602, Optomechatronic Sensors, Actuators, and Control; (2004) https://doi.org/10.1117/12.571511
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

Abstract

The small form factor optical data storage devices are developing rapidly nowadays. Since it is designed for portable and compatibility with flesh memory, its components such as disk, head, focusing actuator, and spindle motor should be assembled within 5 mm. The thickness of focusing actuator is within 2 mm and the total working range is +/-100um, with the resolution of less than 1μm. Since the thickness is limited tightly, it is hard to place the yoke that closes the magnetic circuit and hard to make strong flux density without yoke. Therefore, Halbach 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 with sacrificing less flex 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 dynamics, working range, control resolution of focusing actuator are analyzed and performed.

Citation Download Citation

Sung Q Lee, Kang-Ho Park, and Mun Chul Paek "Halbach array type focusing actuator for small and thin optical data storage device", Proc. SPIE 5602, Optomechatronic Sensors, Actuators, and Control, (25 October 2004); https://doi.org/10.1117/12.571511

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