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Actuator Carriage Design for Load/Unload Hard Disk Drive

IP.com Disclosure Number: IPCOM000118967D
Original Publication Date: 1997-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 64K

Publishing Venue

IBM

Related People

Goeke, D: AUTHOR [+4]

Abstract

Disclosed is an actuator carriage design used in a load/unload Hard Disk Drive (HDD). Fig. 1 shows a top view of an HDD that adopted a load/unload function. An HDD has a ramp, and an actuator is staying on during non-operating time. Consequently, actuator speed should be controlled when load/unload. Also, even after power off, the actuator should be unloaded on a ramp.

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Actuator Carriage Design for Load/Unload Hard Disk Drive

      Disclosed is an actuator carriage design used in a load/unload
Hard Disk Drive (HDD).  Fig. 1 shows a top view of an HDD that
adopted a load/unload function.  An HDD has a ramp, and an actuator
is staying on  during non-operating time.  Consequently, actuator
speed should be controlled when load/unload.  Also, even after power
off, the actuator  should be unloaded on a ramp.

      The problem is an actuator rebounds after hitting to the outer
crash stop with max speed by power off.  In the case where the
rebound is too big, the actuator is dropped to a disk from a ramp.
But to assure power off retract function from any cylinder, it is
difficult to  optimize.  So, to reduce actuator rebound, it is
important to have a margin to optimize power off retract design.

      Fig. 2 shows a conventional actuator design and a new actuator
design.  The new actuator has a slant where there is contact to the
outer crash stop.

      With this design, rebound value can be reduced about 60%
compared with conventional (Flat) design, calculated in Fig. 3.

The merit of this design is that it is easy to implement carriage
design without higher cost.