Patent ID: 7345851

Claim:
A magnetic recording disk drive comprising: a magnetic recording disk having a plurality of data tracks; a read/write head for reading data from and writing data to the disk; a head carrier for supporting the read/write head; a primary actuator for coarse positioning the head to a selected track and comprising a primary actuator arm and a suspension attached to an end of the primary actuator arm; a piezoelectric microactuator for moving the head in a cross-track direction to fine position the head over the selected track, the microactuator comprising: a substrate attached to the suspension; a post fixed to the substrate; a rotatable frame connected to the post by a plurality of torsional springs, the springs permitting rotary movement of the frame about an axis through the post, wherein the head carrier is attached to the rotatable frame; a single piezoelectric driver having a portion fixed to the substrate and a movable portion having bidirectional linear displacement in a direction generally parallel to the cross-track direction; a connecting rod having its length oriented generally orthogonal to the cross-track direction and having a driver end connected to the driver movable portion and a frame end connected to the rotatable frame at a radius from the axis of the post; a linkage connecting the driver movable portion to the driver end of the rod and causing the driver end of the rod to move in a generally linear direction substantially orthogonal to the generally linear cross-track displacement of the driver movable portion, the linkage amplifying the displacement of driver movable portion, whereby the frame end of the rod exhibits a generally linear displacement greater than the generally linear displacement of the driver movable portion in response to movement of the driver movable portion; and an anchor fixed to the substrate and connected to the driver movable portion by an anchor flexure, the anchor flexure permitting the generally linear movement of the driver movable portion in the cross-track direction and preventing movement generally orthogonal to said cross-track direction.