Suspension having microactuator grounded to opposite side of metal support layer

Patent metadata

Field	Value
Publication number	US-9224410-B1
Application number	US-201414472820-A
Country	US
Kind code	B1
Filing date	Aug 29, 2014
Priority date	Sep 4, 2013
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

In a dual stage actuated suspension, the conductive adhesive that forms the ground connection bridge from the ground electrode of the PZT microactuator to the grounded stainless steel layer of the flexure, extends from the ground electrode of the PZT around an edge of the stainless steel layer and to a side of the stainless steel layer that is opposite the side of the stainless steel layer to which the PZT is mounted. An aperture in the load beam allows a stream of hot air during the epoxy cure step to be directed directly onto the conductive epoxy ground connection bridge, thus allowing that conductive epoxy ground connection to be reliably and completely cured.

First claim

We claim:

1. A dual stage actuated suspension for a disk drive, comprising:
a head slider mounted to a distal end of the suspension;
a grounded metal layer having a first side and an opposite second side;
a microactuator mounted to the first side of the metal layer, the microactuator having:
a first face and an opposite second face, the two faces defining a driven electrode and a ground electrode, respectively; and
a proximal end and an opposite distal end;
wherein actuation of the microactuator causes the microactuator's distal end to move thereby effecting fine positional movements of the head slider; and

a first hardenable conductive adhesive bridge extending from the micro actuator's ground electrode through an opening in the grounded metal layer and to the second side of the grounded metal layer opposite the first side thereof to which the microactuator is mounted.

2. The suspension of claim 1 wherein the hardenable conductive adhesive comprises conductive epoxy.

3. The suspension of claim 1 wherein the hardenable conductive adhesive defines a first adhesive, and the suspension further comprises a second adhesive bonding the microactuator's ground electrode to the first side of the grounded metal layer.

4. The suspension of claim 3 wherein the second adhesive comprises non-conductive adhesive.

5. The suspension of claim 3 wherein the second adhesive comprises conductive adhesive.

6. The suspension of claim 1 wherein the second side of the grounded metal layer has gold plated thereon to define a gold plated grounding pad, and the hardenable conductive adhesive extends to the gold plated grounding pad.

7. The suspension of claim 1 further comprising a second hardenable conductive adhesive bridge extending from the microactuator's driven electrode to a driving voltage electrical contact pad that supplies a driving voltage for actuating the microactuator.

8. The suspension of claim 7 wherein the second hardenable conductive adhesive bridge is disposed at the proximal end of the microactuator, and the first conductive adhesive bridge is disposed at the distal end of the microactuator.

9. The suspension of claim 7 wherein the first and second hardenable conductive adhesive bridges are both disposed at a same end of the microactuator.

10. The suspension of claim 1 wherein the grounded metal layer to which the microactuator is mounted is a metal layer of a flexure.

11. The suspension of claim 1 wherein the grounded metal layer to which the microactuator is mounted is part of at least one of a load beam and a base plate.

12. The suspension of claim 1 wherein the first hardenable conductive adhesive bridge is directly accessible through an aperture in the suspension for hardening by a stream of hot air blowing directly onto said bridge.

13. A dual stage actuated suspension for a disk drive, comprising:
a beam;
a flexure affixed to the beam, the flexure comprising:
a stainless steel layer having a bottom surface and a top surface;
an insulating layer on the bottom side of the stainless steel layer; and
a signal conductor layer on a bottom side of the insulating layer;

a head slider affixed to a bottom of a gimbaled portion of the flexure;
a microactuator attached under the stainless steel layer for effecting fine positional movements of the head slider; and
a first electrical bridge comprising a flowable and hardenable conductive material extending from a top surface of the microactuator to a top surface of the stainless steel layer.

14. The suspension of claim 13 further comprising a gold pad on the top surface of the stainless steel layer of the flexure, the electrical bridge extending to the gold pad.

15. The suspension of claim 13 further comprising a second electrical bridge comprising a flowable and hardenable conductive material extending from a bottom surface of the microactuator to a bottom side of the signal conducting layer.

16. The suspension of claim 13 wherein:
the top surface of the stainless steel layer to which the first electrical bridge extends, has gold plating thereon defining a first gold contact pad to which the first electrical bridge is bonded; and
the signal conductor layer has gold plating thereon defining a second gold contact pad from which a second electrical bridge extends to a bottom surface of the microactuator;
whereby the microactuator's top surface is electrically bridged to a first gold contact pad on the top surface of the stainless steel layer, and the microactuator's bottom surface is electrically bridged to the second gold contact pad on a bottom surface of the signal conducting layer, the two gold contact pads being on opposite sides of the flexure.

17. A dual stage actuated suspension for a disk drive, comprising:
a flexure comprising a stainless steel support layer, an insulating layer, and a copper conducting layer;
a first gold contact pad on a surface of the stainless steel support layer facing away from the copper conducting layer;
a second gold contact pad on a surface of the copper conducting layer facing away from the stainless steel support layer;
a microactuator having a driven electrode and a ground electrode;
a first electrical connection from the first gold contact pad to the microactuator's ground electrode; and
a second electrical connection from the second gold contact pad to the microactuator's driven electrode;
whereby the driven and ground electrodes of the microactuator are electrically connected to a driving voltage and to ground, respectively, at opposite faces of the flexure.

18. The suspension of claim 17 wherein the first and second electrical connections comprise a flowable and hardenable conductive adhesive.

19. The suspension of claim 17 wherein additional adhesive bonds the microactuator's ground electrode to a surface of the stainless steel support layer facing the copper conducting layer.

Assignees

• Magnecomp Corp

Inventors

• Ee Kuen Chee
• Hahn Peter
• Zhang Long

Classifications

• G11B5/483 Primary

  Piezoelectric devices between head and arm, e.g. for fine adjustment · CPC title

• G11B5/4873

  the arm comprising piezoelectric or other actuators for adjustment of the arm · CPC title

• G11B5/4853

  Constructional details of the electrical connection between head and arm · CPC title

• G11B5/4826 Primary

  Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive (G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56) · CPC title

• G11B5/5552

  using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means · CPC title