Browse Prior Art Database

Base-Plate Structure for Slim Disk Drive

IP.com Disclosure Number: IPCOM000115716D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Heath, J: AUTHOR

Abstract

The use of disk drives in laptop and notebook computers requires that the drives be slim to enhance the portability and convenience of the product. This in turn requires that all elements of the file structure should be thin, including the base. The consequent reduced strength and stiffness of the structure has the effect of increasing distortion of the relative positions of the heads with respect to the disks due to twisting of the base under varying stress. The stresses that cause problems are induced both during the assembly of the drive after servo-writing, during assembly of the drive into the computer, and by shock and thermal loads during its use.

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Base-Plate Structure for Slim Disk Drive

      The use of disk drives in laptop and notebook computers
requires that the drives be slim to enhance the portability and
convenience of the product.  This in turn requires that all elements
of the file structure should be thin, including the base.  The
consequent reduced strength and stiffness of the structure has the
effect of increasing distortion of the relative positions of the
heads with respect to the disks due to twisting of the base under
varying stress.  The stresses that cause problems are induced both
during the assembly of the drive after servo-writing, during assembly
of the drive into the computer, and by shock and thermal loads during
its use.

      It has been regarded as good design practice to stiffen the
base structure (usually a casting) with ribs generally distributed
across the casting, and also round the ridges.  However, this
approach can be faulted.  The essential feature of this invention is
to recognize that stiffening between the disk spindle and the
actuator pivot, which are centrally located on the base, is very
beneficial, that stiffening of the edges of the base is also
beneficial, but that stiffening ribs that link the edges to the
central assembly of actuator and disk are counter productive.  The
reason for this is that stresses are induced only at the edges of the
base, and flexibility in the base isolates the central functional
parts from the distorting influences.

      Th...