Head gimbal assembly including dampening for air bearing vibration
View Patent ↗A gimbal assembly to dampen air bearing vibration to reduce interference with read-write operations. The gimbal assembly includes dampeners on coextending gimbal arms gimbally supporting an air bearing slider to dampen vibration of the air bearing slider excited by air bearing vibration modes.
1. A head gimbal assembly comprising:
slider including a slider body having a leading edge, a trailing edge and body length between the leading and trailing edges;
a gimbal spring having opposed spaced coextending gimbal arms having an elongated length coextending with the body length of the slider; and
separate spaced dampening strips formed on the opposed spaced coextending gimbal arms and the separate spaced dampening strips having a strip length aligned with the elongate length of the gimbal arms coextending with the body length of the slider.
2. The head gimbal assembly of claim 1 wherein the separate spaced dampening strips are formed of a viscoelastic material.
3. The head gimbal assembly of claim 2 and further comprising a constraining layer formed on the viscoelastic dampening strips.
4. The head gimbal assembly of claim 3 wherein the constraining layer is formed of a metal material.
5. The head gimbal assembly of claim 3 wherein the constraining layer is formed of a polymer material.
6. The head gimbal assembly of claim 2 wherein a dimension of the viscoelastic dampening strips optimizes gimbal flexure of the gimbal arms and dampening response for air bearing vibration modes.
7. The head gimbal assembly of claim 1 wherein the gimbal spring and the opposed spaced coextending gimbal arms are formed along a portion of a flexible circuit including a plurality of leads to electrically connect to a transducer elements carried by the slider.
8. The head gimbal assembly of claim 1 wherein the gimbal spring includes a tongue portion to attach to an end portion of a suspension arm.
9. The head gimbal assembly of claim 1 wherein the gimbal spring includes a slider tab extending from a cross beam coupled to ends of the coextending gimbal arms.
10. The head gimbal assembly of claim 1 wherein a load beam supplies a load force at a load point of the head gimbal assembly about which the slider pitches and rolls.
11. A head gimbal assembly comprising:
a slider including a slider body having a leading edge, a trailing edge and a body length between the leading and trailing edges;
a gimbal spring having opposed spaced coextending gimbal arms having an elongate length coextending with the body length of the slider; and
a dampener formed on the spaced coextending gimbal arms and the dampener including a dampening layer and a constraining layer formed of a polymer material.
12. The head gimbal assembly of claim 11 wherein the gimbal spring includes a tongue to attach the gimbal spring to a suspension arm to form a head suspension assembly.
13. The head gimbal assembly of claim 11 wherein the gimbal spring includes a slider tab coupled to an end portion of the coextending gimbal arms.
14. The head gimbal assembly of claim 11 wherein the polymer constraining layer forms an outer layer and the dampening layer forms an inner layer on the gimbal arms.
15. The head gimbal assembly of claim 11 wherein a load beam supplies a load force at a load point of the head gimbal assembly about which the slider pitches and rolls.
16. A head gimbal assembly comprising:
an air bearing slider including a leading edge, a trailing edge and body length between the leading edge and the trailing edge;
a gimbal spring having a spring body including opposed spaced coextending gimbal arms having an elongate length coextending with the body length of the slider; and
a dampener formed only on the gimbal arms of the spring body and having a length extending along the opposed spaced gimbal arms coextending along the body length of the slider.
17. The head gimbal assembly of claim 16 wherein the dampener includes a viscoelastic dampening layer formed on the opposed spaced gimbal arms.
18. The head gimbal assembly of claim 17 and further comprising a constraining layer formed on the viscoelastic dampening layer.
19. The head gimbal assembly of claim 18 wherein the constraining layer is approximately 0.001 inches thick.
20. The head gimbal assembly of claim 17 wherein the viscoelastic dampening layer extends only along an intermediate portion of the coextending gimbal arms.