Claims
- 1. A method of controlling a shape of a bearing surface of a head slider, the method comprising:
obtaining a set of shape adjust patterns, wherein each pattern corresponds to a response in the shape of the bearing surface; generating a representation of the shape of the bearing surface of the slider wherein the representation includes a plurality of measurements of substantially the entire shape of the bearing surface, each measurement corresponding to a location on the bearing surface and a height of the associated location; and selectively altering material stresses on a working surface of the slider within the obtained shape adjust patterns based on the representation to alter the shape of the bearing surface.
- 2. The method of claim 1 and further comprising:
obtaining a desired shape of the slider; and calculating an indication corresponding to a difference between the desired shape and the representation.
- 3. The method of claim 2 wherein generating the representation comprises:
measuring the representation as:S(x,y)=a0+a1*x+b1*y+C1*f1(x,y)+C2*f2(x,y)+ . . . +Cn*fn(x,y);wherein, a0, a1, *x, b1 * y represent the general orientation of the head, f1(x,y), f2(x,y), . . . , fn(x,y) represent a collection of functions corresponding to the set of shape adjust patterns, and C1, C2, . . . , Cn represent the indications and are coefficients related to degree of response to respective functions.
- 4. The method of claim 3 and further comprising:
only altering material stresses in the shape adjust patterns where the corresponding coefficients are not within an acceptable level.
- 5. The method of claim 4 wherein the coefficients are calculated using a least squares calculation method.
- 6. The method of claim 2 and further comprising:
checking whether the indication is within a tolerance level.
- 7. The method of claim 6 and further comprising:
repeatedly altering material stresses on the working surface of the slider until the indication is within the tolerance level.
- 8. The method of claim 7 wherein the step of altering includes increasing the burn line density in the shape adjust patterns until the indication is within the tolerance level.
- 9. The method of claim 1 and further comprising:
calculating a linear response region, wherein the linear response region pertains to a burn line density in at least one of the shape adjust patterns corresponding to a substantially linear response in shape of the bearing surface.
- 10. The method of claim 1 wherein selectively altering material stresses includes selectively scanning a laser beam spot along the working surface of the slider to form at least one laser scan line within at least one of the shape adjust patterns.
- 11. The method of claim 10 wherein selectively scanning a laser beam spot includes forming at least one laser scan line within each shape adjust pattern.
- 12. The method of claim 1 wherein the representation comprises:
a bitmap measurement of the shape of the bearing surface, wherein the bitmap measurement corresponds to a bearing surface array, the bearing surface array including a plurality of pixels substantially covering the entire bearing surface, each pixel corresponding to an area on the bearing surface and a height of the associated area.
- 13. The method of claim 1 wherein at least one of the shape adjust patterns contributes substantially to a crown curvature response.
- 14. The method of claim 1 wherein at least one of the shape adjust patterns contributes substantially to a cross curvature response.
- 15. The method of claim 1 wherein at least one of the shape adjust patterns contributes substantially to a twist response.
- 16. The method of claim 1 wherein at least one of the shape adjust patterns contributes substantially to a center response.
- 17. A head slider fabricated according to the method of claim 1.
- 18. A head slider, comprising:
a first surface having a shape defined by a collection of base shapes; a second surface opposite the first surface; a set of shape adjust patterns on the second surface, wherein each shape adjust pattern corresponds to one of the collection of base shapes; and a selected number of scan lines formed within each of the shape adjust patterns on the second surface, each scan line generating a degree of response on the first surface of one of the collection of base shapes associated with the shape adjust pattern.
- 19. The slider of claim 18 wherein at least one of the shape adjust patterns contributes substantially to a crown curvature response on the first surface.
- 20. The slider of claim 18 wherein at least one of the shape adjust patterns contributes substantially to a cross curvature response on the first surface.
- 21. The slider of claim 18 wherein at least one of the shape adjust patterns contributes substantially to a twist response on the first surface.
- 22. The slider of claim 18 wherein at least one of the shape adjust patterns contributes substantially to a center response on the first surface.
- 23. The slider of claim 18 and further comprising first and second side edges between the first and second surfaces, wherein a thickness of the first and second side edges is about 8 mills.
- 24. The slider of claim 18 and further comprising first and second side edges between the first and second surfaces, wherein a thickness of the first and second side edges is in the range of about 6-10 mills.
- 25. The slider of claim 18 wherein the shape of the first surface is represented as:
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims benefit of U.S. Provisional Application No. 60/363,801 filed on Mar. 12, 2002 for inventors Youping Mei, Peter R. Goglia, Jun Mou, Mohamed Salah Khlif and Gordon M. Jones and entitled GROUPED SUBSPACE BASIS (GSB) METHOD FOR DISK HEAD FLATNESS CONTROL.
Provisional Applications (1)
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Number |
Date |
Country |
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60363801 |
Mar 2002 |
US |