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US 2011/0299197 A1Published application
Hard disk drive
AssigneeHitachi, Ltd.
InventorTakehiko EGUCHI
Life of this patent
Estimating the term…
Abstract
In a hard disk drive, for the purpose of solving a problem that a mass of the tip of a VCM actuator increases, a primary resonance frequency lowers and a control band lowers in a case where a balance driving mechanism which damps a vibration during the driving of a microactuator is mounted, a damping unit using a displacement enlargement mechanism by resonance is disposed to obtain a sufficient damping effect with a small mass, thereby setting a resonance frequency of the damping unit to be higher than a frequency of a resonance peak of a damping object.
Claims2
A hard disk drive comprising:
- a disk which records information;
- a magnetic head which reads and writes the information from and in the disk;
- a head-gimbal assembly which supports the magnetic head;
- a support arm which supports the head-gimbal assembly;
- a coarse motion actuator which displaces and drives the support arm in such a direction as to intersect with a track direction of the disk;
- and
- a micromotion actuator for micromotion displacement which finely displaces and drives the head-gimbal assembly in such a direction as to intersect with the track direction of the disk,
- said hard disk drive further comprising:
- a damping unit including:
- a resonator in which a mass member is elastically supported to be displaceable in a predetermined direction,
- a base portion in which a mount portion including the mounted resonator is elastically supported to be displaceable in the predetermined direction, and
- a micromotion actuator for damping which displaces and drives the mount portion of the base portion in the predetermined direction,
- wherein the damping unit is disposed in the head-gimbal assembly so that the predetermined direction of the damping unit becomes the same as a displacement direction of the magnetic head by the driving of the micromotion actuator, and
- the micromotion actuator for micromotion displacement and the micromotion actuator for damping drive the damping unit so that the micromotion displacement direction of the magnetic head and the displacement direction of the mount portion have opposite phases.
11 more elements
Dependencies are inferred from the claim text.