Magnetic head slider having optimized ratio of negative pressure bearing to a front or center step bearing
View Patent ↗A magnetic head slider, for sliding on a magnetic disk, which comprises a leading edge, a trailing edge, an air bearing surface having a front step bearing of submicron depth made from the leading edge, and a rail surface made from the front step bearing. A negative pressure recess, which is more profound than the front step bearing, is made from the rail surface, and a side step bearing with a depth identical to that of the front step bearing is made from the rail surface, wherein the ratio of depth R of the recess and depth δs of the front step bearing is R/δs≧5.
1. A head slider for keeping a constant flying height, comprising:
a leading edge;
a trailing edge; and
an air bearing surface formed from said leading edge, said air bearing surface including:
a front step bearing formed from said leading edge;
a rail surface formed from said step bearing;
a negative pressure recess formed between said rail surface and said trailing edge;
a center step bearing formed from said trailing edge; and
a center pad on said center step bearing,
wherein said front step bearing has a depth δs from said rail surface, said negative pressure recess has a depth R from said rail surface, R/δs≧5, and R is a depth which corresponds to a maxunum of negative pressure force.
2. A head slider according to claim 1 , in which said center step bearing has a depth δs from surface of said center pad, and said negative pressure recess has a depth R from surface of said center pad.
3. A head slider according to claim 1 , in which said rail surface has a polygonal border in said leading edge side.
4. A head slider according to claim 1 , in which said rail surface is formed of divided parts.
5. A head slider according to claim 4 , in which said negative pressure recess is formed between said divided parts.
6. A head slider according to claim 4 , in which said divided parts have a skew border in said leading edge side.
7. A head slider according to claim 1 , in which said center step bearing has a polygonal border in said leading edge side.
8. A head slider according to claim 1 , in which said center pad has a polygonal border in said leading edge side.
9. A head slider for keeping a constant flying height, comprising:
a leading edge;
a trailing edge; and
an air bearing surface formed from said leading edge, said air bearing surface including:
a front step bearing formed from said leading edge;
a rail surface formed from said step bearing;
a negative pressure recess formed between said rail surface and said trailing edge;
a center step bearing formed from said trailing edge; and
a center pad on said center step bearing,
wherein said center step bearing, has a depth δs from a surface of said center pad, said negative pressure recess has a depth ft from surface of said center pad, R/δs≧5, and ft is a depth which corresponds to a maximum of negative pressure force.
10. A head slider according to claim 9 , in which said rail surface has a polygonal border in said leading edge side.
11. A head slider according to claim 9 , in which said rail surface is formed of divided parts.
12. A head slider according to claim 11 , in which said negative pressure recess is formed between said divided parts.
13. A head slider according to claim 11 , in which said divided parts have a skew border in said leading edge side.
14. A head slider according to claim 9 , in which said center step bearing has a polygonal border in said leading edge side.
15. A head slider according to claim 9 , in which said center pad has a polygonal border in said leading edge side.