Electrical connections to a microactuator in a hard disk drive suspension

A dual stage actuator (DSA) type suspension for a disk drive, the suspension comprising:

• a load beam;
• a microactuator coupled to the load beam to effect fine movements thereof;
• a flexible circuit comprising a plurality of conductive traces, the traces carrying data signals and at least one microactuator driving voltage, wherein at least one of the traces of the flexible circuit is electrically coupled to an electrical contact pad that extends over the microactuator;
• a stainless steel spring welded to the suspension, the stainless steel spring providing a bias force that presses the electrical contact pad against a first surface of the microactuator, the electrical contact pad carrying a microactuator drive voltage to the microactuator first surface that causes the microactuator to expand thereby effecting said fine load beam movements;
• electrically conductive grease disposed between the electrical contact pad and the microactuator first surface;
• wherein the electrical contact pad is not connected to the microactuator first surface by soldering or by conductive epoxy, said bias force and conductive grease providing the only electrical path for said microactuator driving voltage between the electrical contact pad and the microactuator.