Abstract: A pivot bearing for an actuator assembly of a disk drive includes a first stationary member, a second pivoting member, and a third flexible member interconnecting the first and second members. The first stationary member is secured preferably between the base and top cover of the drive, while the second pivotal member is secured to the actuator. The second pivoting member rotates about the stationary member, and the third flexible member bends in response to the pivoting action of the second member. Rolling contact occurs between bearing surfaces of the first and second members. Overall bearing stiffness is increased with use of the bearing, and particularly radial stiffness. Increased bearing stiffness enhances system mode frequency and thereby improves bandwidth capability for a disk drive.

Abstract: A rotary positioning stage which enables a high speed and high precision positioning. The rotary positioning stage includes an arc-like portion 7a for forming an arc with respect to a rotation shaft 10, a rotary stage 2 on which a workpiece 5 can be mounted, a pulley 12 contacting the arc-like portion 7a, first positioning means 3 for positioning the workpiece 5 by rotating the rotary stage 2 via the pulley 12, second positioning means 4 for positioning the workpiece 5 by slightly moving the first positioning means 3 in a straight line-like manner in a tangent line direction at a contact point between the arc-like portion 7a and the pulley 12, wherein the straight line motion of the first positioning means 3 is converted into a rotational motion of the rotary stage 2 to position the workpiece 5.