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SELF-LUBRICATING POROUS SIEVE HARD DISK DRIVE HEAD FOR DASD AND TAPE FILES

IP.com Disclosure Number: IPCOM000014242D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 1 page(s) / 27K

Publishing Venue

IBM

Abstract

A self-lubricating head which supplies a moderately low vapor pressure lubricant to the rails and pads has been designed to overcome stiction and wear effects during intermittent contact of the head and disk/tape system for files designed in contact or near-contact recording. The lubricant is contained within the micro-porous structure of the RIE etched cavity of the head surface. During file operation the lubricant slowly evaporates out of these pores and sieve holes to condense from a molecularly smooth film onto the air bearing pads and rails. One or more mono-layers of critical lubricant that is deposited prevents the deleterious action of stiction and wear effects normally seen with non lubricated heads. This promotes stable flying over the life of the product and insures more reliable product.

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  SELF-LUBRICATING POROUS SIEVE HARD DISK DRIVE HEAD FOR DASD AND TAPE FILES

   A self-lubricating head which supplies a moderately low vapor pressure
lubricant to the rails and pads has been designed to overcome stiction and wear
effects during intermittent contact of the head and disk/tape system for files
designed in contact or near-contact recording. The lubricant is contained within
the micro-porous structure of the RIE etched cavity of the head surface. During
file operation the lubricant slowly evaporates out of these pores and sieve holes
to condense from a molecularly smooth film onto the air bearing pads and rails.
One or more mono-layers of critical lubricant that is deposited prevents the
deleterious action of stiction and wear effects normally seen with non lubricated
heads. This promotes stable flying over the life of the product and insures more
reliable product.

A recording head is typically made of a hard ceramic material which has special
surface features to enable air bearing regions for flying in close proximity to a
rigid disk or tape system. As the flying height decreases between the head and
disk/tape the probability of intermittent contacts increases. Vibration or
pressure changes in the drive system typically will cause the head to actually
come into contact with the surface medium. The disk or tape medium is usually
lubricated with a high molecular weight, low oxidizable film of liquid which is
typically 10 Angstroms to 100 Angstroms in thickness. This lubricant layer
usually acts as a boundary lubri...