Browse Prior Art Database

DEPOP Head Arm Assembly for Hard Disk Drive

IP.com Disclosure Number: IPCOM000113525D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Takeuchi, K: AUTHOR [+3]

Abstract

This article describes a designing method for actuators used in depopulated models of Hard Disk Drives (HDDs). In the basic model, the center of gravity is designed to the opposite side to the heads. The dummy heads used in the depop model can be designed to equalize both the moment of inertia and imbalance. Therefore, the compatibility of the actuator in the depop model will increase.

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DEPOP Head Arm Assembly for Hard Disk Drive

      This article describes a designing method for actuators used in
depopulated models of Hard Disk Drives (HDDs).  In the basic model,
the center of gravity is designed to the opposite side to the heads.
The dummy heads used in the depop model can be designed to equalize
both the moment of inertia and imbalance.  Therefore, the
compatibility of the actuator in the depop model will increase.

      In past cases, the dummy head was designed to equalize inertia
or balance.  When the inertia is equalized, the balance was
different, when the balance is equal, inertia is different.  By using
this method, the actuator in the basic model is designed as in the
chart.
                  Center of Gravity(mm)   Mass (g)   Inertia (g*cm^2)
  Carriage               -2.24             10.3            19.35
  HSA                    28.56             0.197           1.75
  Dummy Head             26.74             0.238           1.75

      In this way, the balance and inertia of the four head basic
model and two head depop model will be as follows.
                   Center of Gravity(mm)     Inertia (g*cm^2)
  Basic 4 Head           -0.05                   26.9
  Depop 2 Head            0.08                   26.9...