Magnetic disk drive with supply of perfluoropolyether as lubricant
AssigneeHitachi, Ltd.
InventorsTakayuki Nakakawaji, Mina Ishida, Yutaka Ito, Hiroyuki Matsumoto, Hiroshi Tani
Life of this patent
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Abstract
A magnetic disk drive having a small decrease in lubricant film thickness on the surface of the magnetic disk and a superior sliding reliability between the magnetic head and the magnetic disk surface. Perfluoropolyether is supplied as the lubricant onto the surface of the magnetic disk using heat and air flow by applying perfluoropolyether onto the surface of a suspension, or impregnating perfluoropolyether into a filter. The lubricant contains perfluoropolyether having a molecular weight sufficient to enable lubrication and smaller than 4000 by at least 40%.
Claims12
A magnetic disk drive comprising:
- a magnetic disk,
- a spindle motor for rotating said magnetic disk,
- a magnetic head slider for recording or reproducing data onto or from said magnetic disk, and
- a housing;
- further comprises:
- a control circuit system for controlling said head slider so that said head slider is positioned on the magnetic disk plane when said magnetic disk is rotating, and said head slider is saved to outside the magnetic disk plane when rotation of said magnetic disk is stopped;
- and
- a lubricant supply means for supplying lubricant to the surface of said magnetic disk;
- wherein
- said lubricant supply means contains at least perfluoropolyether having a structure expressed by one of structural formulas 1 to 5 as a lubricant, and said lubricant contains said perfluoropolyether having a molecular weight of at least 1000 and smaller than 4000 by at least 40%;
A magnetic disk drive comprising:
- a magnetic disk,
- a spindle motor for rotating said magnetic disk,
- a magnetic head slider for recording or reproducing data onto or from said magnetic disk, and
- a housing;
- further comprises:
- a control circuit system for controlling said head slider so that said head slider is positioned on the magnetic disk plane when said magnetic disk is rotating, and said head slider is saved to outside the magnetic disk plane when rotation of said magnetic disk is stopped;
- and
- a lubricant supply means for supplying lubricant to the surface of said magnetic disk;
- wherein
- said lubricant supply means contains at least perfluoropolyether having a structure expressed by one of structural formulas 1 to 5 as a lubricant, and said lubricant contains said perfluoropolyether having a molecular weight sufficient to enable lubrication and no greater than 4000;
A magnetic disk drive comprising:
- a magnetic disk,
- a spindle motor for rotating said magnetic disk,
- a magnetic head slider for recording or reproducing data onto or from said magnetic disk, and
- a housing;
- further comprises:
- a control circuit system for controlling said head slider so that said head slider is positioned on the magnetic disk plane when said magnetic disk is rotating, and said head slider is saved to outside the magnetic disk plane when rotation of said magnetic disk is stopped;
- and
- a lubricant supply means for supplying lubricant to the surface of said magnetic disk;
- wherein
- said lubricant supply means contains at least perfluoropolyether having a structure expressed by one of structural formulas 1 to 5 as a lubricant, and said lubricant contains said perfluoropolyether having a molecular weight sufficient to enable lubrication and no greater than 4000 by at least 40%;
Dependencies are inferred from the claim text.