The patent's assignee for patent number 8643980 is
News editors obtained the following quote from the background information supplied by the inventors: "A hard disk drive includes a head disk assembly and a printed circuit board attached to a disk drive base of the head disk assembly. Referring now to FIG. 1, the head disk assembly 10 includes at least one disk 11 (such as a magnetic disk, magneto-optical disk, or optical disk), and a track seeking/track following actuator 12, and at least one head gimbal assembly HGA that includes a head 14 and a suspension assembly 13. During operation of the disk drive, the track seeking/track following actuator 12 must rotate to position the head 14 adjacent desired information tracks on the disk 11. An arrow on disk 11 indicates the direction of disk rotation in FIG. 1. Track seeking/track following actuator 12 may be a rotary actuator driven by a voice coil motor. The disk 11 includes an information storage media, such as, for example, a hard magnetic layer protected by a thin overcoat layer and supported by a substrate and various underlayers.
"The head 14 comprises a body called a 'slider' that carries a magnetic transducer on its trailing end. The magnetic transducer comprises a writer and a read element. The writer may be of a longitudinal or perpendicular design, and the read element may be inductive or magnetoresistive. The transducer is supported in close proximity to the magnetic disk by a hydrodynamic air bearing. As the motor rotates the magnetic disk, the hydrodynamic air bearing is formed between an air bearing surface of the head and a surface of the magnetic disk.
"As the information storage capacities of hard drives are increased, the information tracks thereon become more closely spaced. Accordingly, accurate positioning of the transducer with respect to the information tracks becomes increasingly important to ensure accurate reading and writing of the data stored in the information tracks."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Various embodiments of the present invention solve the foregoing problem by providing a micro-actuator for laterally translating the transducer with respect to the slider body. The micro-actuator includes a plurality of elongate flexures configured to constrain the movement of the transducer to a single dimension, and to thereby improve the hard drive head's track following bandwidth by as much as, if not more than, 5 dB.
"According to one embodiment of the subject disclosure, a magnetic recording device comprises a slider body having a slider interface surface, and a magnetic transducer having a lower surface coplanar with an air bearing surface of the magnetic recording device. The magnetic transducer has a transducer interface surface perpendicular to the air bearing surface. The magnetic recording device further comprises a piezoelectric actuator operably connecting the slider interface surface and the transducer interface surface. The piezoelectric actuator is configured to translate the magnetic head with respect to the slider body in a direction substantially parallel to the slider and transducer interface surfaces. The piezoelectric actuator comprises a plurality of elongate flexures disposed in parallel planes within a body of the piezoelectric actuator.
"According to another embodiment of the subject disclosure, a method for making a piezoelectric actuator comprises the steps of disposing a layer of piezoelectric material over a substrate, forming a plurality of parallel trenches in the layer of piezoelectric material, plating an elongate flexure in each of the plurality of parallel trenches, and applying an electric field across the piezoelectric material in a direction substantially perpendicular to the plurality of elongate flexures to pole the piezoelectric material.
"It is to be understood that both the foregoing summary of the invention and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed."
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