Head gimbal assembly including a flexure with a first conductive trace disposed between a slider and a dielectric layer
View Patent ↗There is provided a head gimbal assembly (HGA) for a disk drive. The HGA includes a slider and a flexure. The slider includes first, second and third electrically conductive pads disposed upon a trailing side. The first electrically conductive pad is disposed between the second and third electrically conductive pads. The flexure includes first, second, and third patterned conductive traces respectively electrically connected to the first, second, and third electrically conductive pads. The first patterned conductive trace is disposed between the second and third patterned conductive traces in a flexure body portion.
1. A head gimbal assembly (HGA) for a disk drive, the HGA comprising:
a slider including a top surface and an air bearing surface that opposes the top surface, a leading side, and a trailing side that opposes the leading side, the slider further including first, second and third electrically conductive pads disposed upon the trailing side, the first electrically conductive pad being disposed between the second and third electrically conductive pads;
a load beam;
a flexure including:
a flexure body portion affixed to the load beam;
a tongue portion with the slider being attached to the tongue portion;
first and second gimbal arms extending between the flexure body portion and the tongue portion;
a metal backing layer;
a dielectric layer;
first, second, and third conductive traces respectively electrically connected to the first, second, and third electrically conductive pads so that the first conductive trace is electrically connected to the first electrically conductive pad, each conductive trace being disposed upon the dielectric layer with the dielectric layer between each conductive trace and the metal backing layer, the first conductive trace being disposed upon the dielectric layer between the top surface of the slider and the dielectric layer, the second conductive trace being disposed in the tongue portion and extending along the first gimbal arm to the flexure body portion, the third conductive trace being disposed at the tongue portion extending along the second gimbal arm to the flexure body portion, the first conductive trace disposed between the second and third conductive traces in the flexure body portion; and
a base plate for mounting the HGA, the base plate attached to the load beam.
2. The HGA of claim 1 wherein the dielectric layer comprises polyimide.
3. The HGA of claim 1 wherein the metal backing layer comprises stainless steel.
4. The HGA of claim 1 wherein the first conductive trace is electrically connected to the metal backing layer through the dielectric layer.
5. The HGA of claim 4 wherein the dielectric layer includes a via and the first conductive trace is electrically connected to the metal backing layer through the via.
6. The HGA of claim 1 wherein the first conductive trace is connected to an electrical ground.
7. The HGA of claim 1 further comprising a flex cable electrically connected to the flexure at the flexure body portion.
8. The HGA of claim 7 wherein the flexure body portion includes a flexure tail portion and the flex cable is electrically connected to the flexure tail portion.
9. The HGA of claim 1 wherein the first conductive trace includes a support portion, the support portion being disposed between the top surface of the slider and the dielectric layer, the support portion being generally rectangular shaped.
10. The HGA of claim 1 wherein the slider further includes fourth and fifth electrically conductive pads disposed upon the trailing side and the flexure further includes fourth and fifth conductive traces disposed upon the dielectric layer, the fourth conductive trace being disposed in the tongue portion and extending along the first gimbal arm to the flexure body portion, the fifth conductive trace being disposed at the gimbal extending and along the second gimbal arm to the flexure body portion.
11. The HGA of claim 10 wherein the first conductive trace is disposed along the flexure body portion between the fourth and fifth conductive traces.
12. The HGA of claim 1 wherein the metal backing layer is affixed to the load beam in the flexure body portion.
13. The HGA of claim 12 wherein the metal backing layer is spot-welded to the load beam in the flexure body portion.
14. The HGA of claim 1 wherein the load beam includes a dimple that contacts the tongue portion.