BUMPER FOR LIMITING FLOW OF HEAD OF HARD DISK DRIVE

摘要

PURPOSE: A bumper for limiting the flow of a head of the hard disk drive is provided to reduce impact generated when the head is slapped on the disk by limiting a distance at which the head can be parted from the surface of the disk. CONSTITUTION: A hard disk drive assembly(10) is equipped with one or more disks(12) rotated by a spindle motor(14). Each disk(12) has a upper surface(18) and a lower surface(19). A multiplicity of heads(20) are coupled magnetically to the disks(12). Each head(20) is mounted on suspensions(22). The heads(20) and the suspensions(22) are generally called a head gimbal assembly(24). The head gimbal assembly(24) is installed at an actuator arm(26) connected at a base plate(16) in a pivot shaft. The actuator arm(26) is equipped with a voice coil(28) connected with a magnet assembly(30) attached to the base plate(16). The disk(12), the head gimbal assembly(24), the actuator arm(26) and the voice coil motor(32) are all installed on the base plate(16) enclosed by a cover plate(34). The base plate(16) comprises a base protrusion(36) located between the base plate(16) and the lowest part of the disk. The cover plate(34) comprises a cover protrusion(38) located between the cover plate(34) and the uppermost part of the disk. Each protrusion is equipped with an elastomeric bumper(40) to buffer the impact of the head gimbal assembly(24).