Patent ID: 7630175
Filing Date: 2009-12-08
Classification: G11B

Abstract:
1. A hard disk drive comprising: a flexure for attachment to an arm member of a suspension, the flexure for holding a head slider including a thin-film magnetic head that performs at least one of a recording and a reproduction of information with respect to a recording medium, the flexure comprising: a first external power supply electrically connected to the first layered piezoelectric element of the first piezoelectric layer unit, a second external power supply electrically connected to the second layered piezoelectric element of the first piezoelectric layer unit, a third external power supply electrically connected to the third layered piezoelectric element of the second piezoelectric layer unit, and a fourth external power supply electrically connected to the fourth layered piezoelectric element of the second piezoelectric layer unit, wherein the flexure is oriented so that each of a pair of lines crosses the recording medium, each of the pair of lines extending along a respective laminating direction of a respective one of the first and second piezoelectric layer units, and each of the first external power supply, the second external power supply, the third external power supply and the fourth external power supply supply voltages to the respective electrically connected layered piezoelectric elements, a magnitude of the voltage supplied by each external power supply being different from magnitudes of the voltages supplied by each of the other external power supplies, the supplied voltages causing the respective electrically connected layered piezoelectric elements to expand in a direction parallel to a surface of the main body.