Importance

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Abstract

Rotary positioning devices are described wherein a coil and permanent magnet combination is provided to couple a torque into a pivotally mounted arm member, the pivot of which is located substantially at the center of gravity of the assemblage. By coupling such a torque into the device to cause rotational pivotal movement, forces otherwise imposed upon the pivot and bearing structure are substantially avoided. Suited particularly for a rotary head positioning assemblage utilized with disk drives, in one embodiment, the permanent magnets are mounted with the pivoting arm for movement adjacent an energized coil structure. In another embodiment, the coils are mounted upon the pivoted arm and are moved in adjacency with spaced magnet structures. The magnet structures may be configured with slots and geometric shapes selected to achieve optimized torque developing vectors exhibiting uniformity of force application throughout the extent of pivoting of the arm assemblage.

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First Claim