| 摘要 |
A rotational micro-actuator ( 20 ) used in hard disk driver is disclosed. It comprises a frame ( 21 ) approximately in the shape of letter "S" and PZT pieces ( 28, 29 ) attached to said frame ( 21 ), wherein said frame ( 21 ) is formed with a central coupling portion ( 213 ) by which the micro-actuator ( 20 ) is coupled to a suspension tongue ( 177 ), and two pieces of said PZT ( 28, 29 ) are arranged in central symmetry manner about said central coupling portion ( 213 ) such that said micro-actuator ( 20 ) can rotate about said central coupling portion ( 213 ) in response to the driving signals applied to said PZT pieces ( 28, 29 ), thus cause the displacement of the head element secured to the micro-actuator ( 20 ) so as to achieve the fine positioning of the head element. With above configuration, the micro-actuator of this invention will not cause the resonance of the suspension base plate during operation. Thereby the servo bandwidth of the hard disk driver is expanded.
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