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Browse Prior Art Database

Unique Linear Actuator Configuration

IP.com Disclosure Number: IPCOM000108173D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 67K

Publishing Venue

IBM

Related People

Watrous, R: AUTHOR

Abstract

Fig. 1 is an internal plane view of a data storage with a linear actuator. For clarity the top plate and magnet of the VCM (voice coil motor) and the top disk have been removed. The actuator carriage support consists of two parallel, spaced apart, flexure members (flex legs) whose non-moving ends are fixed to the inside of the file enclosure (box). Their moving ends are attached to the carriage extremities. While the carriage could be carried by conventional rails and pre-loaded wheels flex legs are used since they are cheaper, friction free, and non-contaminating. A rectangular cross section coil is attached to the middle of the carriage. This coil interacts with the flux generated by the permanent magnets located above, below, and behind it. The center pole and steel plates complete the flux paths.

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Unique Linear Actuator Configuration

      Fig. 1 is an internal plane view of a data storage with a
linear actuator.  For clarity the top plate and magnet of the VCM
(voice coil motor) and the top disk have been removed.  The actuator
carriage support consists of two parallel, spaced apart, flexure
members (flex legs) whose non-moving ends are fixed to the inside of
the file enclosure (box).  Their moving ends are attached to the
carriage extremities.  While the carriage could be carried by
conventional rails and pre-loaded wheels flex legs are used since
they are cheaper, friction free, and non-contaminating.  A
rectangular cross section coil is attached to the middle of the
carriage.  This coil interacts with the flux generated by the
permanent magnets located above, below, and behind it.  The center
pole and steel plates complete the flux paths.  Arms carrying
head/suspension assemblies are attached to or made an integral part
of the carriage.  The circuit lines (not shown) from the heads and
the VCM coil can be routed along the flex legs for an easy transition
from the moving to the stationary members of the file.

      A conventional linear actuator moves along the same radial line
as the heads, whereas with the proposed design the actuator moves
parallel to the radial line traversed by the heads.  This makes it
possible to:
      1.   locate the "up" and "down" heads on opposite sides of hub,
thus requiring less intra-disk spacing than conve...