Patent ID: 6771449
Filing Date: 2004-08-03
Classification: G01P,G11B

Abstract:
A magnetic disk drive comprising:a magnetic disk which records or reproduces information; a motor which rotates said magnetic disk; a base which fixes said motor; a magnetic head which reads from or writes to said magnetic disk; a carriage which supports said magnetic head; a coil which is mounted on said carriage for transferring said magnetic head to any position on the surface of said magnetic disk; a voice coil motor comprising a magnetic circuit and said coil; an unload mechanism which evacuates said magnetic head from the surface of said magnetic disk; and a falling sensor provided with a conductive weight, a flexible elastic member which is deformed by the gravity of said weight, and a conductive member which is arranged to be placed in contact or non-contact with said weight; wherein said weight contacts said conductive member at the deflected state of said elastic member, and said weight becomes to be in non-contact with said conductive member when said magnetic disk drive is falling, so that said magnetic head is evacuated by said unload mechanism.