IP Library › Granted Patent US 7,314,404
Granted Patent B2
US 7,314,404 · App. 11/399,883 · Granted Jan 1, 2008

Burnishing head

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Quick Facts
Patent No.
US 7,314,404
App. No.
11/399,883
Filed
Apr 7, 2006
Granted
Jan 1, 2008
Kind
B2
Art Unit
3723
USPC
451/63
Abstract

A burnishing head comprises at least two rails, each rail having an inner wall and an outer wall. The outer walls are at an angle relative to one another and relative to a central axis of the burnishing head. This angle permits the burnishing head to exhibit improved recovery time if it contacts a disk being burnished. The rail walls are vertical, and the corner between the rail walls and the top surface of the rails is sharp.

Claims (24)

1. A burnishing head comprising:

a body of material having a leading edge and a trailing edge;

first and second rails extending from a surface of said body of material, said first and second rails comprising inner and outer walls, said outer wall of said first rail being at an angle with respect to a central axis of said burnishing head such that the portion of said outer wall of said first rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said first rail closest to the trailing edge, said outer wall of said second rail being at an angle with respect to the central axis such that the portion of said outer wall of said second rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said second rail closest to the trailing edge, wherein the height of the rails is greater than 30 μm, at least one wall of at least one rail forms an angle between 75 and 90° with respect to a plane of said surface of said body of material as measured from said plane, through said rail, to said wall, and the radius of curvature between said outer walls of said first and second rails and a burnishing surface of said first and second rails is less than 0.5 mils.

2. Burnishing head of claim 1 wherein the angles between said outer walls and the central axis are each between about 5 to 25 degrees.

3. Burnishing head of claim 1 wherein the first and second rails are symmetrical with respect to said central axis to thereby enhance flyability of said burnishing head.

4. A burnishing head comprising:

a body of material having a leading edge and a trailing edge;

first and second rails extending from said body of material, said first and second rails comprising inner and outer walls, said outer wall of said first rail being at an angle with respect to a central axis of said burnishing head such that the portion of said outer wall of said first rail closest to the leading edged is closer to the central axis than the portion of said outer wall of said first rail closest to the trailing edge, said outer wall of said second rail being at an angle with respect to the central axis such that the portion of said outer wall of said second rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said second rail closest to the trailing edge, wherein the height of the rails is greater than 30 μm, and the radius of curvature between said outer walls of said first and second rails and a burnishing surface of said first and second rails is less than 0.5 mils.

5. A method for burnishing a magnetic disk comprising:

rotating said magnetic disk; and

flying a burnishing head over said magnetic disk, said burnishing head comprising a body of material and first and second rails extending from a surface of said body of material, said burnishing head having a leading edge and a trailing edge, said first and second rails comprising inner and outer walls, said outer wall of said first rail being at an angle with respect to a central axis of said burnishing head such that the portion of said outer wall of said first rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said first rail closest to the trailing edge, said outer wall of said second rail being at an angle with respect to the central axis such that the portion of said outer wall of said second rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said second rail closest to the trailing edge, wherein the height of the rails is greater than 30 μm, at least one wall of at least one rail forms an angle between 75 and 90° with respect to a plane of said surface as measured from said plane through said rail to said at least one wall, and the radius of curvature between said outer walls of said first and second rails and a burnishing surface of said first and second rails is less than 0.5 mils.

6. Method of claim 5 wherein the angles between the outer walls and the central axis are each between 5 and 25°.

7. Method of claim 5 wherein the first and second rails are symmetrical with respect to said central axis to thereby enhance flyability of said burnishing head.

8. A method for burnishing a magnetic disk comprising:

rotating said magnetic disk; and

flying a burnishing head over said magnetic disk, said burnishing head comprising a body of material and first and second rails extending from said body of material, said burnishing head having a leading edge and a trailing edge, said first and second rails comprising inner and outer walls, said outer wall of said first rail being at an angle with respect to a central axis of said burnishing head such that the portion of said outer wall of said first rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said first rail closest to the trailing edge, said outer wall of said second rail being at an angle with respect to the central axis such that the portion of said outer wall of said second rail closest to the leading edge is closer to the central axis than the portion of said outer wall of said second rail closest to the trailing edge, wherein said rails have a height greater than 30 μm, and the radius of curvature between said outer walls of said first and second rails and a burnishing surface of said first and second rails is less than 0.5 mils.

9. A burnishing head comprising:

a body of material; and

first and second rails extending from a surface of said body of material by a distance greater than 30 μm, said first and second rails comprising inner and outer walls, at least one of said outer walls being at an angle with respect to a center axis of said burnishing head, wherein said at least one of said outer walls forms an angle between 75 and 90° with respect to a plane of said surface of said body of material as measured from said plane, through said rail to said outer walls, and the radius of curvature between said outer walls of said first and second rails and a burnishing surface of said first and second rails is less than 0.5 mils.

10. A method for burnishing a magnetic disk comprising:

rotating said magnetic disk; and

flying a burnishing head over said magnetic disk, said burnishing head comprising a body of material and first and second rails extending from a surface of said body of material by a distance greater than 30 μm, said first and second rails comprising inner and outer walls, at least one of said outer walls being at an angle with respect to a central axis of said burnishing head, wherein said at least one outer wall of said first and second rails form an angle between 75 and 90° with respect to a plane of said surface of said body of material as measured from said plane, through said rails to said outer wall, and the radius of curvature between said outer walls of said first and second rails and a burnishing surface of said first and second rails is less than 0.5 mils.

11. Burnishing head of claim 1 , 4 or 9 wherein said body of material comprises AlTiC.

12. Method of claim 5 , 8 or 10 wherein said body of material comprises AlTiC.