Browse Prior Art Database

Flex Tension Control Method by Voice Coil Motor Magnet

IP.com Disclosure Number: IPCOM000118802D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 75K

Publishing Venue

IBM

Related People

Kanada, N: AUTHOR [+4]

Abstract

Disclosed is a device that uses the magnet of a Voice Coil Motor (VCM) and a steel chip of an actuator to minimize the influence of flexible cable tension change by temperature/humidity stress in a Hard Disk Drive (HDD) adopted load/unload function by using a ramp.

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Flex Tension Control Method by Voice Coil Motor Magnet

      Disclosed is a device that uses the magnet of a Voice Coil
Motor (VCM) and a steel chip of an actuator to minimize the influence
of flexible cable tension change by temperature/humidity stress in a
Hard Disk Drive (HDD) adopted load/unload function by using a ramp.

      Fig. 1 shows the top view of the HDD adopted load/unload
function by using a ramp (1).  The actuator (2) stays on the ramp
during non-operating mode.  If temperature/humidity stress applies to
HDD during non-operating mode, neutral zone (= zero torque zone) of
flexible cable (3) tension changes from disk (4) area to ramp area.
(Fig. 3 shows an example of flexible cable tension change without
implementation of this device.)  When the neutral zone of the
flexible cable tension comes into the ramp area and the HDD comes
into the power  saving mode, the actuator will interfere with the
ramp.  The power saving  mode means that the actuator stays in the
disk area without supplying current to the VCM coil (5).  Fig. 2
shows an example of this device.  The magnet (6) of the voice coil
motor (7) has a small protrusion and the actuator has a small steel
chip.  Consequently, during  the power-saving mode, the actuator
stays in the proper position by pulling the force of the magnet
without interference to the ramp.  (Fig. 4 shows an example of
flexible cable tension change with the implementation of this
device.)

      The merit of th...