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Browse Prior Art Database

Foil Spindle Ground

IP.com Disclosure Number: IPCOM000106401D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Albrecht, D: AUTHOR [+4]

Abstract

In a typical disk drive, the head is rubbing the disk for only a few seconds during each start and stop. The accumulated contact time through the machine life is not more than a couple of hours. However, the total spindle spinning time can be in the order of 30,000 hours or more. If a traditional ground button is employed, it will be counter-productive 99.9% of the time.

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Foil Spindle Ground

      In a typical disk drive, the head is rubbing the disk for only
a few seconds during each start and stop.  The accumulated contact
time through the machine life is not more than a couple of hours.
However, the total spindle spinning time can be in the order of
30,000 hours or more.  If a traditional ground button is employed, it
will be counter-productive 99.9% of the time.

      The design consists of a foil (1) as shown in the Figure.  It
has a typical dimension of 10 mm long, 2 mm wide and 002 mm thick.
One end of the foil (1) is attached to the stationary base plate (2).

The other end is resting on the rotating hub (3).  The foil (1) is
deformed by 0.5 mm when it is compressed between the two surfaces (2)
and (3).  The space between the foil (1) and the rotating hub (3) is
very similar to a funnel (5) and will lift the foil (1) up.  The
stiffness and the geometry are selected to make the foil (1) take off
after all of the heads are flying.  This typically occurs around 2000
RPM.