Ground feature for disk drive head suspension flexures

摘要

Various embodiments concern an electrical interconnect of a head suspension. The electrical interconnect can comprise a spring metal layer and a dielectric layer having an aperture with a portion of the spring metal layer being exposed through the dielectric layer within the aperture. The electrical interconnect can further comprise a trace layer disposed on the dielectric layer and extending into the aperture to connect with the spring metal layer. Part of the spring metal layer within the aperture may not be covered by the trace layer. The exposure of the spring metal layer through the aperture can be due to the width of the trace layer being less than the width of the aperture and/or the exposure can be due to expected misregistration. A polymer covercoat can be applied over the aperture to protect the trace layer from corrosion.

主权项

1. An electrical interconnect of a head suspension comprising:
a spring metal layer, the spring metal layer electrically conductive, the spring metal layer having a first side and a second side opposite the first side; a dielectric layer having a first side and a second side opposite the first side, the second side of the dielectric layer disposed on the first side of the spring metal layer, the dielectric layer having an aperture between the first side and the second side of the dielectric layer, a portion of the first side of the spring metal layer exposed through the dielectric layer within the aperture; and a trace layer having a first section and a second section, the trace layer formed from an electrically conductive metal, the first section of the trace layer disposed on the first side of the dielectric layer, the second section of the trace layer extending into the aperture to mechanically and electrically connect with the portion of the first side of the spring metal layer, wherein part of the portion of the first side of the spring metal layer is not covered by the trace layer; corrosion inhibiting type metal plated on the first section of the trace layer, wherein the second section of the trace layer is not plated with the corrosion inhibiting type of metal; and a covercoat layer extending over the trace at the location of the aperture and covering the unplated second section of the trace layer, the covercoat comprising a polymer layer that inhibits corrosion of the trace layer.