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Absorbent Metal Crash Stop Against Rebound

IP.com Disclosure Number: IPCOM000014871D
Original Publication Date: 2000-Jul-01
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

JP8-1999-0568 Absorbent Metal Crash Stop against Rebound M. Ohta J. Hatazawa K. Kuroki K. Takahashi This article describes an absorbent metal crash stop for load/unload type Hard Disk Drive (HDD). In case of a super small HDD such that back-emf of spindle motor is too low to retract actuator, discharge current of cpacitor is applied to Voice Coil Motor (VCM) at power off. A good safety margin discharge current is required so that actuator must be retracted at any time. Therefore, very occasionally actuator hits the outer crash stop and bounces back to the disk. In this case, spindle motor cannot be rotated again because head of actuator is stuck on the disk strongly.