Abstract
Mechanical response of an actuator arm of a 1-inch hard disk drive (HDD) against a small and steep impact load is accurately measured by means of modifying the Levitation Mass Method (LMM) whose basic concept was proposed by the first author. In the method, a mass that is levitated with an aerostatic linear bearing, and hence encounters negligible friction, is made to collide with a subject actuator arm and the dynamic bending test for the arm is realized. During the collision the Doppler frequency shift of the laser beam reflecting from the mass is accurately measured using an optical interferometer. The velocity, the position, the acceleration and the inertial force of the mass are calculated from the measured time-varying Doppler frequency shift. The importance and the problems concerning the present knowledge on the mechanical response of an actuator arm of a 1-inch hard disk drive (HDD) are also discussed.
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