Disk drive suspension tri-stage actuator having pseudo feature integrally constructed on trace gimbal

Patent metadata

Field	Value
Publication number	US-10068595-B2
Application number	US-201715668594-A
Country	US
Kind code	B2
Filing date	Aug 3, 2017
Priority date	Aug 5, 2016
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A dual stage actuated suspension has a first piezoelectric microactuator on the trace gimbal assembly (TGA), and a pseudo feature located laterally opposite the microactuator. The pseudo feature is formed integrally with the TGA from at least one of the base metal layer, the insulative layer, and the conductive layer that make up the TGA. The pseudo feature helps to balance the suspension. The suspension can optionally have a second microactuator located proximal of the first microactuator in order to perform coarser positioning than the first microactuator, such that the suspension is a tri-stage actuated suspension.

First claim

We claim:

1. A dual stage actuated disk drive suspension comprising:
a beam;
a trace gimbal assembly (TGA) attached to the beam;
a single piezoelectric device mounted on the TGA and arranged to move a head slider carried by the TGA; and
a counterbalance disposed laterally opposite the piezoelectric device, the counterbalance being formed integrally with the TGA and providing counterbalance to the piezoelectric device, wherein the counterbalance includes copper having a width that is at least three times an average width of electrical traces on the suspension that are electrically coupled with the head slider.

2. The suspension of claim 1 wherein the counterbalance has at least a first portion and a second portion, the second portion being at least three times as wide as the first portion and comprising a same material as the first portion.

3. The suspension of claim 1 wherein the counterbalance includes a metal spring integrally formed of at least one of a metal base layer and a conductive layer of the TGA.

4. A dual stage actuated disk drive suspension comprising:
a beam;
a trace gimbal assembly (TGA) attached to the beam, the TGA comprising:
a metal base layer;
an insulating layer on the metal base layer; and
a conductive layer on the insulating layer;
the TGA having a first lateral side and a second lateral side opposite the first lateral side;

a head slider mounted to the TGA;
a first piezoelectric device mounted on the first lateral side of the TGA and arranged for moving the head slider, the first piezoelectric device having a mass;
wherein:
the suspension does not have a second piezoelectric device that is disposed on the second lateral side of the TGA generally opposite the first piezoelectric device; and
the suspension includes a counterbalancing mass on the second lateral side of the suspension to balance out the mass of the first piezoelectric device, and having a mass of at least one quarter of the mass of the first piezoelectric device;
wherein the counterbalancing mass includes copper having a width that is at least three times an average width of electrical circuit traces on the suspension that are electrically coupled with the head slider.

5. The suspension of claim 4 further comprising:
the counterbalancing mass disposed laterally opposite the first piezoelectric device and having a mass of at least 50% of the mass of the first piezoelectric device, the counterbalancing mass including at least one of the metal base layer, the insulating layer, and the conductive layer, the counterbalancing mass having been formed integrally with the TGA.

6. The suspension of claim 4 wherein the counterbalancing mass includes a metal spring integrally formed of at least one of the metal base layer and the conductive layer.

7. The suspension of claim 5 wherein the counterbalancing mass includes copper that is disposed on the second lateral side of the suspension and positioned directly opposite the first piezoelectric device.

8. The suspension of claim 7 wherein the copper that is disposed on the second lateral side of the suspension positioned directly opposite the first piezoelectric device has a mass that is at least 10% of the mass of the first piezoelectric device.

9. The suspension of claim 7 wherein:
the conductive layer includes the electrical circuit traces.

10. The suspension of claim 5 wherein the counterbalancing mass has a mass that is within 50% of the mass of the first piezoelectric device and a stiffness that is within 50% of a stiffness of the first piezoelectric device.

11. A dual stage actuated disk drive suspension comprising:
a beam;
a trace gimbal assembly (TGA) attached to the beam, the TGA including:
a metal base layer;
an insulating layer on the metal base layer; and
a conductive layer on the insulating layer;

the TGA including a flexure gimbal for carrying a head slider, and an electrical circuit including electrical traces formed of the conductive layer on the insulating layer for carrying electrical signals to and from the head slider;
a piezoelectric device disposed on the flexure gimbal on a first lateral side of a central longitudinal axis of the suspension; and
a pseudo feature disposed on a second and opposite lateral side of the central longitudinal axis and in generally mirror relation to the first piezoelectric device, and having a mass that is within 30% of a combined mass of the piezoelectric device and adhesive attached thereto, the pseudo feature comprising at least one of the metal base layer, the insulating layer, and the conductive layer, and integrally formed with the trace gimbal assembly;
wherein the pseudo feature includes copper having a width that is at least three times an average width of the electrical traces on the suspension that are electrically coupled with the head slider.

12. The suspension of claim 11 wherein the pseudo feature does not include a weight that was formed separately from the TGA and later affixed to the TGA.

13. The suspension of claim 11 wherein the pseudo feature does not include a weight that was formed separately from the TGA and later affixed to the TGA, and that has a mass that is greater than 50% of a mass of the piezoelectric device.

14. The suspension of claim 11 wherein the pseudo feature includes copper and polyimide.

15. The suspension of claim 11 wherein the pseudo feature includes stainless steel and copper.

16. The suspension of claim 11 wherein the pseudo feature has a mass that is within 30% of a combined mass of the piezoelectric device and adhesive affixing the piezoelectric device to the flexure gimbal.

17. The suspension of claim 11 wherein:
the piezoelectric device defines a first piezoelectric device; and
the suspension further includes a second piezoelectric device that is mounted on the suspension proximal of the first piezoelectric device, the second piezoelectric device arranged to rotate the entire beam.

Assignees

• Magnecomp Corp

Inventors

• Ee Kuen Chee
• Zhang Long
• Glaess David

Classifications

• G11B5/483 Primary

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

• G11B5/4833

  Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head (G11B5/484 takes precedence) · CPC title

• G11B5/596

  for track following on disks {(G11B5/5526, G11B5/5552, G11B5/5565, G11B5/5582 take precedence)} · CPC title

• G11B5/4873

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