Browse Prior Art Database

Diagonal Pre-Amplifier Module Mounting

IP.com Disclosure Number: IPCOM000116823D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Albrecht, D: AUTHOR [+3]

Abstract

This article discloses a design for Hard Disk Drives (HDD) in which the Pre-amplifier Module (called AE) is placed normal to the disks and diagonally. By this design, the head - AE distance is minimized and read/write signal quality is improved. In high performance HDD's this is effective in reducing cost, since the known way to improve signal quality is Direct Chip Attach. This is a method in which the chip is directly mounted to the actuator arm.

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Diagonal Pre-Amplifier Module Mounting

      This article discloses a design for Hard Disk Drives (HDD) in
which the Pre-amplifier Module (called AE) is placed normal to the
disks and diagonally.  By this design, the head - AE distance is
minimized and read/write signal quality is improved.  In high
performance HDD's this is effective in reducing cost, since the known
way to improve signal quality is Direct Chip Attach.  This is a
method in which the chip is directly mounted to the actuator arm.

      Signal quality is improved much by shortening the distance from
the head to the pre-amp.  Direct Chip Attach does this by mounting
the chip directly to the arm.  This process is very cost consuming
since the chip is directly handled and ultra-sonic bonding processes
are involved.  When a module is used, it is very cost effective.  Is
such a case, it is usally placed parallel to the disk to maximize the
space inside the disk enclosure.  If in a typical HDD, the distance
from the AE to the head attachment were to be x if the AE was placed
parallel to the disk, in a case where is is placed normal to the
disk, the distance would be shortened by 33%.  If the AE where to be
diagnal and placed normal to the disk, the distance would be shotened
by 40%.

      By placing the AE module in a plane normal to the disk,
distance of the signal lines from the head can be shortened.  Also,
by placing it diagonal in the same plane, the distance is minimized.