Suspension tongue design for varying the static pitch and roll torque on the slider of a disk drive
A head gimbal assembly includes a slider assembly and a flexure tongue that cantilevers in a first direction and supports the slider assembly. The slider assembly cantilevers away from the flexure tongue in a second direction different than the first direction. A load beam imparts a force on the flexure tongue and generates a first net torque on the slider assembly. The cantilevering of the slider assembly decreases a magnitude of the first net torque on the slider assembly. The force on the flexure tongue can also generate a second net torque on the slider assembly that is oriented about a second axis different than the first axis. The slider assembly can cantilever in the second direction to decrease the magnitude of the second net torque on the slider assembly. Portions of the flexure tongue and the slider assembly can be spaced apart from one another to form a gap that is directly between the flexure tongue and the slider assembly. The flexure tongue can includes a tongue aperture and/or one or more notches that increase the deflection of the flexure tongue to decrease the first net torque.
1. A head gimbal assembly comprising:
a load beam;
a slider; and
a flexure arm having a distal end that is detached from but resiliently biased in a pressing engagement against the load beam, the flexure arm including a flexure tongue cantilevered in a first direction to operably impart a first torque to the slider, the slider cantilevered from the flexure tongue in a different second direction to define a substantially constant-thickness gap defined by a planar separation between the flexure tongue and the slider, the substantially constant-thickness gap extending entirely from the connection between the slider and the flexure tongue to a distal end of one of the slider and the flexure tongue, a longitudinal extent of the constant-thickness gap sized to operably impart a second torque to the slider of a desired magnitude that is offsetting to the first torque.
2. The head gimbal assembly of claim 1 wherein the load beam imparts a force on the flexure tongue generating a net pitch torque on the slider assembly that is oriented about a first axis that is perpendicular to a longitudinal axis of the slider assembly.
3. The head gimbal assembly of claim 2 wherein the first direction is substantially parallel to the longitudinal axis.
4. The head gimbal assembly of claim 2 wherein a net roll torque is oriented about a second axis that is parallel to the longitudinal axis of the slider.
5. The head gimbal assembly of claim 1 wherein the slider includes a slider retainer that retains the slider, and wherein the flexure tongue is secured to the slider retainer.
6. The head gimbal assembly of claim 5 wherein the flexure tongue is not secured to the slider.
7. The head gimbal assembly of claim 2 wherein the load beam includes a dimple that contacts the flexure tongue, the force is imparted on the flexure tongue through the dimple, and a portion of the gap is positioned directly between the dimple and the slider.
8. The head gimbal assembly of claim 1 wherein the flexure tongue includes a tongue aperture that increases the deflection of the flexure tongue to decrease a net roll torque.
9. The head gimbal assembly of claim 1 wherein the flexure tongue includes a notch that increases the deflection of the flexure tongue to decrease a net roll torque.
10. The head gimbal assembly of claim 9 wherein the flexure tongue includes a tongue aperture that increases the deflection of the flexure tongue to decrease the net roll torque.
11. The head gimbal assembly of claim 1 wherein the flexure tongue has a longitudinal axis, and wherein the flexure tongue is asymmetrical relative to the longitudinal axis.
12. The head gimbal assembly of claim 1 wherein the first direction and the second direction are substantially opposite from one another.
13. A disk drive including a storage disk and the head gimbal assembly of claim 1 selectively supported near the storage disk.
14. A head gimbal assembly comprising:
a load beam;
a flexure arm affixed to the load beam at a proximal end of the flexure arm and flexibly detached from the load beam at a distal end of the flexure arm;
a flexure tongue extending from the distal end of the flexure arm;
a protuberant feature extending from at least one of the load beam and the flexure tongue that operably contactingly imparts a force from the load beam to the flexure tongue; and
a slider connected to the flexure tongue, nearer a leading end than a trailing end of the slider, to elsewhere define a constant size spatial gap between the flexure tongue and the slider forming a space extending at least to an extent defined by an orthogonal projection into the gap of the area of the protuberant feature engaging the opposing side of the flexure tongue, and the constant size spatial gap extending longitudinally from the connection between the slider and the flexure tongue to a distal end of one of the slider and the flexure tongue.
15. The head gimbal assembly of claim 14 wherein the slider assembly has a longitudinal axis, and a net pitch torque is in a direction about an axis that is perpendicular to the longitudinal axis of the slider.
16. The head gimbal assembly of claim 14 wherein the slider has a longitudinal axis, and a net roll torque is oriented about an axis that is parallel to the longitudinal axis of the slider assembly.
17. The head gimbal assembly of claim 16 wherein the first direction is substantially perpendicular to the longitudinal axis of the slider.
18. The head gimbal assembly of claim 14 wherein the slider includes a slider retainer that retains the slider, and wherein the flexure tongue is secured to the slider retainer.
19. The head gimbal assembly of claim 14 wherein the load beam includes a dimple that contacts the flexure tongue, the force is imparted on the flexure tongue through the dimple, and a portion of the gap is positioned directly between the dimple and the slider.
20. The head gimbal assembly of claim 14 wherein the flexure tongue has a longitudinal axis, and wherein the flexure tongue is asymmetrical relative to the longitudinal axis.
21. The head gimbal assembly of claim 14 wherein the flexure tongue includes a tongue aperture that increases the deflection of the flexure tongue to decrease a net roll torque.
22. The head gimbal assembly of claim 14 wherein the flexure tongue includes a notch that increases the deflection of the flexure tongue to decrease a net roll torque.
23. The head gimbal assembly of claim 22 wherein the flexure tongue includes a tongue aperture that increases the deflection of the flexure tongue to decrease the net roll torque.
24. A disk drive including a storage disk and the head gimbal assembly of claim 14 selectively supported near the storage disk.
25. The head gimbal assembly of claim 14 wherein the flexure tongue is cantilevered in a first direction and the slider is cantilevered in a different second direction.
26. The head gimbal assembly of claim 14 wherein a distal end of the slider is operably disposed longitudinally beyond the distal end of the flexure arm.