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Form Factor Conforming Shock Isolators for Personal Computer Memory Card International Association Direct Access Storage Devices and Mobile Computing Products

IP.com Disclosure Number: IPCOM000119140D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 155K

Publishing Venue

IBM

Related People

Khanna, V: AUTHOR [+3]

Abstract

Disclosed is an isolation system for Personal Computer Memory Card International Association (PCMCIA) Direct Access Storage Devices (DASDs) and other form-factor limited mobile computing products. These units have to conform to the form-factor specifications only when they are in use, where they have to fit into slots of given dimensions. The isolation system takes advantage of this fact by having flexible members that cushion the shock by taking up additional sway space when the unit is not in use and likely to undergo impact. These flexible members are designed to flatten out upon insertion of the unit into its destination slot, thereby conforming to the form-factor standard when the unit is in use.

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Form Factor Conforming Shock Isolators for Personal Computer Memory
Card International Association Direct Access Storage Devices and
Mobile Computing Products

      Disclosed is an isolation system for Personal Computer Memory
Card International Association (PCMCIA) Direct Access Storage Devices
(DASDs) and other form-factor limited mobile computing products.
These units have to conform to the form-factor specifications only
when they  are in use, where they have to fit into slots of given
dimensions. The  isolation system takes advantage of this fact by
having flexible members  that cushion the shock by taking up
additional sway space when the unit  is not in use and likely to
undergo impact.  These flexible members are  designed to flatten out
upon insertion of the unit into its destination  slot, thereby
conforming to the form-factor standard when the unit is in  use.

      Mobile computing products such as PCMCIA-DASDs can be
subjected to significant shocks during their lifetime, especially
under non-operation conditions.  The external dimensions of these
products have  to conform strictly to specifications set by the
form-factor.  Since these dimensions are quite small, it is a
challenge to design the product  to fit inside the limited volume.
As a result, additional sway space for  traditional shock mounts are
not available for these products.  This, combined with the fact that
users are likely to drop the units during transportation, makes them
particularly vulnerable to shock-related failures.  Thus, a
non-conventional shock isolation scheme that takes into account the
unique features and requirements of PCMCIA-DASDs and other mobile
computing products is required.  Generally, the corners of  the unit
are rounded and filled with shock absorbing material.  This design
make use of the fact that the unit is likely to dropped at a random
orientation, and a corner is likely to bear the impact.  Such a
method is effective in cushioning impacts with large initial tilts.
Nevertheless, a unit with only corner isolators is still vulnerable
to shock when the impact is nearly face-flat.  Such impacts  are
particularly dangerous since they represent the worst case for
head-disk interface and spindle failure modes.  A simple, low cost
solution to protect the units from face-flat and nearly face flat
drops is disclosed next.  This solution can be used either separately
or in conjunction with the corner isolators to protect the units from
shock.

      The device to reduce the impacts of face-flat and nearly
face-flat drops consists of flexible members attached to the top and
b...