Disk drive including head-slider configured to suppress lubricant droplet accumulation
View Patent ↗A disk drive. The disk drive includes a disk and a head-slider. The head-slider includes an air-bearing surface. The air-bearing surface includes a trailing-edge rail surface, an inner trailing-edge pad, and an outer trailing-edge pad. The pad surface of the outer trailing-edge pad includes a straight outer edge slanting outward; and, the angle of the outer edge with respect to the longitudinal direction of the head-slider is β 1 . The pad surface of the inner trailing-edge pad includes a straight inner edge slanting inward; and, the angle of the inner edge with respect to the longitudinal direction of the head-slider is β 2 . For absolute values of skew angles at an outermost data track position and an innermost data track position on the disk that are denoted by α 1 and α 2 , respectively, the following conditions are satisfied: α 2 ≦β 1 ,α 1 +β 1 ≦90°, and α 1 ≦β 2 ,α 2 +β 2 ≦90°.
1. A disk drive comprising:
a disk configured to rotate; and
a head-slider configured to fly in proximity with a recording surface of said disk, said head-slider comprising:
an air-bearing surface configured to face said disk, said air-bearing surface comprising:
a trailing-edge rail surface in which a magnetic-recording head is disposed, said magnetic-recording head comprising:
a read element configured to read data from said disk, and
a write element configured to write data to said disk;
an inner negative-pressure recessed surface formed at an inner diameter side of said trailing-edge rail surface;
an outer negative-pressure recessed surface formed at an outer diameter side of said trailing-edge rail surface;
an inner trailing-edge pad that is disposed between said trailing-edge rail surface and said inner negative-pressure recessed surface, said inner trailing-edge pad comprising:
a pad face deeper than said trailing-edge rail surface and shallower than said inner negative-pressure recessed surface; and
an outer trailing-edge pad that is disposed between said trailing-edge rail surface and said outer negative-pressure recessed surface, said outer trailing-edge pad comprising:
a pad face deeper than said trailing-edge rail surface and shallower than said outer negative-pressure recessed surface,
wherein said pad surface of said outer trailing-edge pad further comprises a straight outer edge slanting outward in said direction from an inflow side toward an outflow side and said angle of said outer edge with respect to said longitudinal direction of said head-slider is β 1 ;
wherein said pad surface of said inner trailing-edge pad further comprises a straight inner edge slanting inward in said direction from an inflow side toward an outflow side and said angle of said inner edge with respect to said longitudinal direction of said head-slider is β 2 ; and
wherein, for absolute values of skew angles at an outermost data track position and an innermost data track position on said disk that are denoted by α 1 and α 2 , respectively, following conditions are satisfied:
α 2 ≦β 1 , α 1 +β 1 ≦90°, and
α 1 ≦β 2 , α 2 +β 2 ≦90°.
2. The disk drive of claim 1 , wherein β 1 and β 2 are equal in magnitude, and said pad face of said inner trailing-edge pad and said pad face of said outer trailing-edge pad are disposed at a same depth.
3. The disk drive of claim 1 , wherein β 1 and β 2 satisfy following conditions:
β 1 ≦35°, and β 2 ≦35°.
4. The disk drive of claim 1 , wherein a length of said inner trailing-edge pad in said longitudinal direction of said head-slider is not less than twice a length from said trailing edge of said head-slider to said leading edge of said magnetic-recording head; and
wherein a length of said outer trailing-edge pad in said longitudinal direction of said head-slider is not less than twice said length from said trailing edge of said head-slider to said leading edge of said magnetic-recording head.
5. The disk drive of claim 1 , wherein said air-bearing surface further comprises a step surface deeper than said trailing-edge rail surface at an inflow side of said trailing-edge rail surface.
6. The disk drive of claim 5 , wherein said pad surface of said inner trailing-edge pad and said pad face of said outer trailing-edge pad are disposed at a same depth that is equal to a depth of said step surface.
7. The disk drive of claim 1 , wherein depths of said inner trailing-edge pad surface and said outer trailing-edge pad surfaces are 0.3 μm or less.
8. The disk drive of claim 1 , wherein said air-bearing surface further comprises two side rail surfaces.
9. The disk drive of claim 8 , wherein each inflow side of said two side rail surfaces is formed in a U-shape.
10. The disk drive of claim 1 , wherein said air-bearing surface further comprises a step surface deeper than said trailing-edge rail surface and shallower than said inner and outer negative-pressure recessed surfaces at an inflow side of said trailing-edge rail surface; and
wherein said air-bearing surface further comprises a protrusion protruding from an inflow side of said trailing-edge rail surface for dividing said step surface.
11. The disk drive of claim 1 , wherein said air-bearing surface further comprises a step surface deeper than said trailing-edge rail surface and shallower than said inner and outer negative-pressure recessed surfaces at an inflow side of said trailing-edge rail surface; and
wherein a width of said trailing-edge rail surface at said trailing edge is less than a width of said step surface at said trailing edge of said step surface.
12. The disk drive of claim 1 , wherein said air-bearing surface further comprises a center channel and a plurality of side channels that are deeper than said negative-pressure recessed surface.
13. The disk drive of claim 12 , wherein at least one of said plurality of side channels is open to said center channel.