Magnetic disk drive

• US 6,917,495 B2
• Filed: 10/22/2003
• Issued: 07/12/2005
• Est. Priority Date: 07/05/2000
• Status: Expired due to Fees

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Hitachi, Ltd.
• Inventors: Ito, Yutaka, Matsumoto, Hiroyuki, Tani, Hiroshi, Nakakawaji, Takayuki, Ishida, Mina
• Primary Examiner(s): HEINZ, ALLEN J
• Application Number:
  US10/689,599
• Publication Number:
  US 20040080864A1
• Time in Patent Office: 629 Days
• Field of Search: 360/234.1
• US Class Current: 360/234.1
• CPC Class Codes: C10M 105/74 containing phosphorus
• CPC Class Codes: C10M 107/38 containing halogen
• CPC Class Codes: C10M 107/48 containing phosphorus
• CPC Class Codes: G11B 33/1446 Reducing contamination, e.g. by dust, debris
• CPC Class Codes: G11B 33/148 Reducing friction, adhesion, drag
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence

Abstract

A magnetic disk drive having a magnetic disk, a spindle motor for rotating the magnetic disk, a magnetic head slider for recording or reproducing data onto or from the magnetic disk and a housing. A control circuit system is provided for controlling the head slider so that the head slider is positioned on the magnetic disk plane when the magnetic disk is rotating, and the head slider is saved to outside the magnetic disk plane when rotation of the magnetic disk is stopped. A lubricant supplier is provided for supplying lubricant to the surface of the magnetic disk. The lubricant supplier contains at least a perfluoropolyether compound having any one of an alcohol group, a cyclic ether group, and an alkyl-ester group at its terminal position as a lubricant, and the lubricant contains the perfluoropolyether compound having a molecular weight sufficient to enable lubrication and no greater than 4000.

Claims

1. 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;

a housing;

a control circuit system for controlling said head slider so that said head slider is positioned on a 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

lubricant supply means for supplying lubricant to the surface of said magnetic disk;

wherein said lubricant supply means contains at least a perfluoropolyether compound having any one of an alcohol group, a cyclic ether group, and an alkyl-ester group at its terminal position as a lubricant, and said lubricant contains said perfluoropolyether compound having a molecular weight sufficient to enable lubrication and no greater than 4000, and

wherein said lubricant supply means is at least one of a suspension applied with said lubricant and an arm applied with said lubricant.

2. 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;

a housing;

a control circuit system for controlling said head slider so that said head slider is positioned on a 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

lubricant supply means for supplying lubricant to the surface of said magnetic disk

wherein said lubricant supply means contains at least a perfluoropolyether compound having any one of an alcohol group, a cyclic ether group, and an alkyl-ester group at its terminal position as a lubricant, said lubricant containing said perfluoropolyether compound having a molecular weight sufficient to enable lubrication and no greater than 4000,

wherein said lubricant supply means includes lubricant holding means for holding said lubricant, and

wherein said lubricant holding means is a filter impregnated with said perfluoropolyether compound by at least 0.5 μ

-liter.

3. 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;

a housing;

a control circuit system for controlling said head slider so that said head slider is positioned on a 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

lubricant supply means for supplying lubricant to the surface of said magnetic disk;

wherein said lubricant supply means contains at least a perfluoropolyether compound having any one of an alcohol group, a cyclic ether group, and an alkyl-ester group at its terminal position as a lubricant, said lubricant containing said perfluoropolyether compound having a molecular weight sufficient to enable lubrication and no greater than 4000,

wherein said lubricant supply means includes lubricant holding means for holding said lubricant, and

wherein said lubricant holding means is a filter impregnated with said perfluoropolyether compound having any one of an alcohol group, a cyclic ether group, and an alkyl-ester group at its terminal position by at least 0.15 μ

-liter, characterized in having scarce smears on a levitated plane of said magnetic head slider.