Magnetic head slider and a magnetic disk device in which the slider is mounted
View Patent ↗A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side, projections being provided at the air-inflow side at positions with respect to the first positive pressure generating portion on a first surface which faces the magnetic disk upon read/write operation of the magnetic head slider, and a step surface provided at the air-inflow side with respect to said first positive pressure generating portion.
1. A magnetic head slider having a magnetic head mounted thereon for recording and reproducing information into/from a surface of a magnetic disk;
wherein said magnetic head slider flies over the magnetic disk surface through a microscopic film of air, utilizing an air stream produced by rotation of the magnetic disk;
wherein said slider has a pad for flying and for producing a flying force, and said pad for flying includes a flat surface portion and a step surface portion which is formed at an air inflow-side portion of said flying pad and is sufficiently recessed perpendicularly from said flat surface portion; and
wherein said slider has microscopic projections having a height which is one of higher than and substantially equal to a height of said flat surface portion relative to said step surface portion and a diameter which is not less than 0.1 mm.
2. A magnetic head slider according to claim 1 , wherein said microscopic projections have a cylindrical shape.
3. A magnetic disk apparatus comprising a magnetic disk;
a spindle motor for rotating said magnetic disk;
a magnetic head slider including a magnetic head for recording and reproducing information into/from a surface of said magnetic disk;
a suspension supporting said magnetic head slider; and
a drive mechanism for pivotally moving said suspension;
wherein said slider has a pad for flying and for producing a flying force, and said pad for flying includes a flat surface portion and a step surface portion which is formed at an air inflow-side portion of said flying pad and is sufficiently recessed perpendicularly from said flat surface portion; and
wherein said slider has microscopic projections having a height which is one of higher than and substantially equal to a height of said flat surface portion relative to said step surface portion and a diameter which is not less than 0.1 mm.
4. A magnetic disk apparatus according to claim 3 , wherein said microscopic projections have a cylindrical shape.
5. A magnetic head slider having a magnetic head mounted thereon for recording and reproducing information into/from a surface of a magnetic disk;
wherein said magnetic head slider flies over the magnetic disk surface through a microscopic film of air, utilizing an air stream produced by rotation of the magnetic disk;
wherein said slider has a pad for flying and for producing a flying force, and said pad for flying includes a flat surface portion and a step surface portion which is formed at an air inflow-side portion of said flying pad and is sufficiently recessed perpendicularly from said flat surface portion; and
wherein said slider has microscopic projections having a height which is one of higher than and substantially equal to a height of said flat surface portion relative to said step surface portion, and a projection amount from said flat surface portion toward the magnetic disk surface which is less than 40 nm.
6. A magnetic head slider according to claim 5 , wherein said projection amount of said microscopic projections is three times more than a mean surface roughness Ra of the magnetic disk surface.
7. A magnetic disk apparatus comprising:
a magnetic disk;
a spindle motor for rotating said magnetic disk;
a magnetic head slider including a magnetic head for recording and reproducing information into/from a surface of said magnetic disk;
a suspension supporting said magnetic head slider; and
a drive mechanism for pivotally moving said suspension;
wherein said slider has a pad for flying and for producing a flying force, and said pad for flying includes a flat surface portion and a step surface portion which is formed at an air inflow-side portion of said flying pad and is sufficiently recessed perpendicularly from said flat surface portion; and
wherein said slider has a microscopic projections having a height which is one of higher than and substantially equal to a height of said flat surface portion relative to said step surface portion and a projection amount from said flat surface portion, toward the magnetic disk surface which is less than 40 nm.
8. A magnetic disk apparatus according to claim 7 , wherein said projection amount of said microscopic projections is three times more than a mean surface roughness Ra of the magnetic disk surface.
9. A magnetic head slider having a magnetic head mounted thereon for recording and reproducing information into/from a surface of a magnetic disk;
wherein said magnetic head slider flies over the magnetic disk surface through a microscopic film of air, utilizing an air stream produced by rotation of the magnetic disk;
wherein said slider has a plurality of pads for flying and for producing a flying force, and each of said plurality of flying pads includes a flat surface portion and a step surface portion which is formed at an air inflow-side portion of said plurality of flying pads and is sufficiently recessed perpendicularly from said flat surface portion;
wherein two of said plurality of flying pads are respectively provided at opposite side portions of said slider in a widthwise direction of said slider and at the air inflow-side thereof while one of said plurality of flying pads is provided at a central portion of said slider at an air outflow-side thereof; and
wherein a rear step surface is formed at a rear side of each of said two air inflow-side flying pads.
10. A magnetic head slider according to claim 9 , wherein one of said microscopic projections is provided on said rear step surface.
11. A magnetic disk apparatus comprising:
a magnetic disk;
a spindle motor for rotating said magnetic disk;
a magnetic head slider including a magnetic head for recording and reproducing information into/from a surface of said magnetic disk;
a suspension supporting said magnetic head slider; and
a drive mechanism for pivotally moving said suspension;
wherein said slider has a plurality of pads for flying and for producing a flying force, and each of said plurality of flying pads includes a flat surface portion and a step surface portion which is formed at an air inflow-side portion of said plurality of flying pads and is sufficiently recessed perpendicularly from said flat surface portion;
wherein said slider has microscopic projections having a height which is one of higher than and substantially equal to a height of said flat surface portion relative to said step surface portion and which is not more than 200 nm;
wherein two of said plurality of flying pads are respectively provided at opposite side portions of said slider in a widthwise direction of said slider and at the air inflow-side thereof while one of said plurality of flying pads is provided at a central portion of said slider at an air outflow-side thereof; and
wherein a rear step surface is formed at a rear side of each of said two air inflow-side flying pads.
12. A magnetic disk apparatus according to claim 11 , wherein one of said microscopic projections is provided on said rear step surface.