Back to results
US 5,423,111 AGranted
Magnetic disk tester
AssigneeHitachi Electronics Engineering Co., Ltd.
InventorKyoichi Mori
Life of this patent
Estimating the term…
Abstract
A magnetic disk tester according to the present invention comprises a first head moving mechanism for fixedly mounting a first certification testing head and a burnishing head perpendicularly of a moving direction thereof and a second head moving mechanism for fixedly mounting a second certification testing head and a glide testing head perpendicularly of a moving direction thereof. The burnishing head and the glide testing head are switched by the first certification testing head and the second certification testing head, respectively, by moving a spindle in an orthogonal direction to the head moving direction.
Claims8
A magnetic disk tester, comprising:
- a spindle for mounting a magnetic disk;
- a burnishing head, a glide testing head and first and second certification testing heads used on a surface of the disk;
- a first head moving mechanism on which said first head and said burnishing head are fixedly mounted for moving said first head and said burnishing head in a first radial direction with respect to said disk, said first head and said burnishing head being arranged perpendicularly of said first radial moving direction;
- a second head moving mechanism on which said second head and said glide testing head are fixedly mounted for moving said second head and said glide testing head in a second radial direction with respect to said disk, wherein said second head and said glide testing head are arranged perpendicularly of said second radial moving direction;
- means for moving said spindle between opposite positions in a direction perpendicular to the first and second radial moving directions, wherein when said spindle is moved with said spindle moving means between said opposite positions, operative positions on the surface of said disk of said burnishing head and said glide testing head are switched with said first head and said second head, respectively.
2 more elements
A magnetic disk tester, comprising:
- a spindle for mounting a magnetic disk;
- a burnishing head, a glide testing head and first and second certification testing heads used on a surface of the disk;
- a spindle shifting mechanism for moving said spindle between opposed first and second positions by a constant distance along a first direction;
- a first head moving mechanism on which said first testing head and said burnishing head are fixedly mounted for moving said first head and said burnishing head in a second direction orthogonal to said first direction, said first head and said burnishing head being arranged on said first head moving mechanism with a distance equal to said constant distance therebetween;
- and
- a second head moving mechanism on which said second head and said glide testing head are fixedly mounted for moving said second testing head and said glide testing head in said second direction, said second testing head and said glide testing head being arranged on said second head moving mechanism with a distance equal to said constant distance therebetween;
- wherein said spindle shifting mechanism shifts said spindle back and forth between said opposed positions along said first direction so that operative positions on the surface of said disk of said burnishing head and said glide testing head are switched with said first testing head and said second head, respectively.
4 more elements
A magnetic disk tester, comprising:
- a spindle for mounting a magnetic disk;
- a spindle shifting mechanism for moving said spindle along a first line between opposed first and second positions by a constant distance in one direction;
- a first head moving mechanism and a second head moving mechanism arranged along a second line in a second direction perpendicularly intersecting said one direction at an intermediate position between said first and second positions substantially symmetrically about said spindle;
- a burnishing head and a first certification testing head mounted parallel to one another on one of said first and second head moving mechanisms symmetrically about said first line with a distance of substantially one-half of said constant distance therebetween;
- and a glide testing head and a second certification testing head mounted in parallel with one another on the other of said first and second head moving mechanisms in opposing symmetrical relationship with said burnished head and said first certification testing head with respect to said second line, wherein when said spindle is moved with said spindle shifting mechanism between said opposite first and second positions, operative positions on a surface of said disk of said burnishing head and said glide testing head are switched with said first head and said second head, respectively.
2 more elements
Dependencies are inferred from the claim text.