Head suspension having a punched gimbal dimple with coined inclined inner and outer surfaces oriented at different angles and method of fabricating same
AssigneeMagnecomp Corporation
InventorDavid Chocholaty
Life of this patent
Estimating the term…
Abstract
A punched gimbal dimple with a coined, frusto-conical base in a head suspension and a method for producing such a dimple. The dimple has an apex and a base, the base having outer and inner surfaces which generally conform to conical frustums. The conical frustum half-cone angles differ by at least 2 degrees. The dimple and its coined base are fabricated by a dimple punch and die with mismatched punch tangent and chamfer angles. The coined dimple base can be more easily seen by optical systems for aligning a slider to the dimple.
Claims18
A head suspension having differing internal and external angles within a dimple for use in a disk drive comprising:
- a gimbal substrate;
- and
- a gimbal dimple protruding from said substrate, said dimple having a base having:
- a generally frusto-conical outer surface having an associated half-cone angle;
- and
- a generally frusto-conical inner surface having an associated half-cone angle;
- wherein said outer surface is disposed directly opposite said inner surface, and said outer surface half-cone angle is different from said inner surface half-cone angle by at least 2 degrees.
A head suspension for use in a disk drive comprising:
- a gimbal substrate;
- and
- a gimbal dimple protruding from said substrate, said dimple having a protruding side, a recessed side, and a cross-section, said cross-section having:
- a generally straight inner incline on said recessed side, the inner incline having an inner incline angle;
- and
- a generally straight outer incline on said protruding side, the outer incline having an outer incline angle, said outer incline disposed directly opposite said inner incline;
- wherein said inner incline angle is different from said outer incline angle by at least 2 degrees.
A method of producing a head suspension for use in a disk drive comprising:
- providing a gimbal substrate;
- providing a dimple punch having a punch tangent angle;
- providing a die having a hole therein, said hole having a chamfer, said chamfer having a chamfer angle, wherein said punch tangent angle differs from said chamfer angle by at least 2 degrees;
- and
- punching said dimple punch into said substrate and over said die, thereby forming a dimple having a base having a generally frusto-conical outer surface having an associated half-cone angle and a generally frusto-conical inner surface having an associated half-cone angle, said outer and inner surfaces being disposed directly opposite each other, said outer surface half-cone angle being different from said inner surface half-cone angle by at least 2 degrees.
Dependencies are inferred from the claim text.