Browse Prior Art Database

Compliant Damped Preload Arm Assembly

IP.com Disclosure Number: IPCOM000115721D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Dominguez Jr, M: AUTHOR [+4]

Abstract

Actuators for disk drives have natural modes of vibration which can be excited by seek motion. This vibration results in increased track misregistration where the amplitude is dependent on the seek velocity, length, delay time, and duty cycle. The magnitude of the track misregistration is a limiting factor in the tracks per inch capability of the drive. Field reliability can also be affected from excursions of the carriage into adjacent tracks resulting in overwrite damage which can result in adjacent track hard data errors.

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Compliant Damped Preload Arm Assembly

      Actuators for disk drives have natural modes of vibration which
can be excited by seek motion.  This vibration results in increased
track misregistration where the amplitude is dependent on the seek
velocity, length, delay time, and duty cycle.  The magnitude of the
track misregistration is a limiting factor in the tracks per inch
capability of the drive.  Field reliability can also be affected from
excursions of the carriage into adjacent tracks resulting in
overwrite damage which can result in adjacent track hard data errors.

      This invention is applied to a linear actuator carriage with a
preload arm/bearing assembly.  The invention consists of a preload
arm/flexure body designed to focus strain energy from the mode of
vibration and then apply damping methods to achieve a minimum
vibration amplitude in the frequency range of concern.  The minimum
excitable amplitude then allows improved track misregistration
allowing higher track density in the disk drive.

      An additional benefit of this invention as applied to preload
arm/roller bearing assemblies is that improved bearing to rail
compliance is achieved.  This improved compliance allows toe and
camber tolerances to be relaxed without increasing wear in the
bearing/rail interface.