Head gimbal assembly with air bearing slider crown having reduced temperature sensitivity
View Patent ↗A head gimbal assembly includes a slider and novel gimbal that may reduce crown sensitivity to temperature without substantially sacrificing the ability of a bond between the gimbal tongue and slider to resist applied forces and torques. The gimbal has a tongue that includes at least one weakening region. The weakening region extends more in a direction perpendicular to the length of the slider than it does in a direction parallel to the length of the slider. A bonding surface of the slider is attached to the tongue in a first bonding region that extends closer to a leading end of the slider than the weakening region does, and in a second bonding region that extends closer to a trailing end of the slider than the weakening region does. The gimbal can be used in a head gimbal assembly of a magnetic hard disk drive or other information storage device.
1. A head gimbal assembly, comprising:
a slider having an air bearing surface opposite a bonding surface, the slider having a leading end and a trailing end separated by a length;
a gimbal having a tongue including at least one weakening region that extends more in a direction perpendicular to said length than it does in a direction parallel to said length, the weakening region comprising a partially etched depression that does not extend completely through the thickness of the tongue, the tongue having a thickness that is less within the partially etched depression than outside of the partially etched depression;
the bonding surface being attached to the tongue in a first bonding region that extends closer to said leading end than the weakening region does, and in a second bonding region that extends closer to said trailing end than the weakening region does, the bonding surface not being attached to the tongue in the weakening region.
2. The head gimbal assembly of claim 1 further comprising a first bonding agent in contact with the first bonding region and a second bonding agent in contact with the second bonding region.
3. The head gimbal assembly of claim 2 wherein both the first bonding agent and the second bonding agent comprise an adhesive material of the same composition.
4. The head gimbal assembly of claim 2 wherein the first bonding agent or the second bonding agent comprises an electrically conductive solder material or an electrically conductive adhesive material.
5. The head gimbal assembly of claim 1 wherein said tongue has an average width measured perpendicular to said length, and said at least one weakening region spans at least one third of said width.
6. The head gimbal assembly of claim 1 wherein said partially etched depression is a groove.