Gimbal assembly geometry for hard disk drive
A gimbal assembly includes a frame having base, tip and mount portions, and a crossbar joined to the tip portion by a neck region. Portions of the crossbar and neck region define transition edge regions each extending from a point of minimum width D of the neck region to where the edge of the crossbar becomes substantially straight. Each of the transition edge regions includes a transition length a and a transition width b. The frame comprises an area of interest that includes the neck region and a portion of the crossbar that has a length of 0.6 mm and is centered to the neck region, and has a total area size A, a centroid C and a centroid distance H between the centroid C and a far side of the neck region. The crossbar and neck region have geometries that satisfy a design metric that is less than 0.05.
1. A suspension assembly for a hard disk drive; comprising:
a load beam;
one or more actuators; and
a gimbal assembly mounted to a distal end of the load beam, the gimbal assembly comprising:
a frame of stainless steel having a thickness t and comprising:
a base portion,
a tip portion,
a mount portion disposed between the base portion and the tip portion, and
a crossbar joined to the tip portion by a neck region having curved opposing edges,
wherein portions of the crossbar and the neck region define a pair of transition edge regions each extending from a first point of minimum width D between the curved opposing edges of the neck region to a second point along an edge of the crossbar where the edge of the crossbar extending away from the neck region becomes substantially straight, and wherein each transition edge region defines a transition length a in a first direction that is parallel to a direction in which minimum width D extends and a transition width b in a second direction that is orthogonal to the first direction.
2. The suspension assembly of claim 1 , further comprising:
a slider mounted to the mount portion.
3. The suspension assembly of claim 1 , wherein the tip portion includes a weld location at which the tip portion is welded to the load beam.
4. The suspension assembly of claim 1 , wherein the base portion includes a plurality of weld locations at which the base portion is welded to the load beam.
5. The suspension assembly of claim 1 , wherein the crossbar is disposed between the tip portion and the mount portion.
6. The suspension assembly of claim 1 , wherein the tip portion is disposed between the crossbar and the mount portion.
7. The suspension assembly of claim 1 , wherein the gimbal assembly further comprises:
wherein the frame comprises an area of interest that includes the neck region and a portion of the crossbar that has a length of 0.6 mm and is centered to the neck region,
wherein the area of interest has a total area size A, a centroid C that is an arithmetic mean position of all points in the area of interest, and a centroid distance H that is a distance between the centroid C and a far side of the neck region;
wherein the crossbar and neck region have geometries such that:
0.8
(
D
0.5
×
(
A
+
0.06
)
0.7
)
(
t
18
)
2.25
+
(
0.2
650
)
(
0.3
(
a
0.2
)
(
b
0.15
)
(
D
0.2
)
(
(
H
+
0.07
)
2
)
)
(
t
18
)
-
1.6
<
0.05
.
8. The suspension assembly of claim 1 , wherein the gimbal assembly further comprises:
wherein each of the transition edge regions includes a transition length a in a first direction which is parallel to a direction in which minimum width D extends and a transition width b in a second direction orthogonal to the first direction,
wherein the frame comprises an area of interest that includes the neck region and a portion of the crossbar extending between the transition edge regions, wherein the area of interest has a total area size A, a centroid C that is an arithmetic mean position of all points in the area of interest, and a centroid distance H that is a distance between the centroid C and a far side of the neck region;
wherein the crossbar and neck region have geometries such that:
0.8
(
D
0.5
×
(
A
+
0.06
)
0.7
)
(
t
18
)
2.25
+
(
0.2
650
)
(
0.3
(
a
0.2
)
(
b
0.15
)
(
D
0.2
)
(
(
H
+
0.07
)
2
)
)
(
t
18
)
-
1.6
<
0.05
.