Micro-actuator damping and humidity protection

• US 6,639,761 B1
• Filed: 06/07/2000
• Issued: 10/28/2003
• Est. Priority Date: 12/02/1999
• Status: Expired due to Term

• Current Assignee: Seagate Technology plc (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Boutaghou, Zine Eddine, Segar, Peter R.
• Primary Examiner(s): Letscher, George J.
• Application Number:
  US09/589,325
• Time in Patent Office: 1,238 Days
• Field of Search: 360/294.1, 360/294.3, 360/291.9, 360/294.4, 360/294.5, 310/309, 310/311, 310/321
• US Class Current: 360/294.1
• CPC Class Codes: G11B 33/1453 by moisture
• CPC Class Codes: G11B 5/5552 using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means

Abstract

A micro-actuator including a skeleton having flexible beams, a rotor portion, a stator portion, and a damping material. The flexible beams connect the rotor portion to the stator portion and the damping material is applied to the skeleton. The damping material provides a protective layer to the flexible beams of a micro-actuator. The damping material increases the damping characteristics of the micro actuator and limits the penetration of humidity into the skeleton of the micro actuator.

Claims

1. A micro-actuator compirising:

a skeleton having structural openings therein for forming flexible beams, the skeleton also having a rotor portion and a stator portion, the flexible beams connecting the rotor portion to the stator portion; and

a damping material, the damping material positioned only on the skeleton.

2. The micro-actuator of claim 1 wherein the damping material covers the flexible beams.

3. The micro-actuator of claim 1 wherein the skeleton has a stress concentration area and the damping material is located at the stress concentration area.

4. The micro-actuator of claim 1 wherein the damping material is positioned on the rotor portion and the stator portion.

5. The micro-actuator of claim 1 wherein the damping material is a lubricant.

6. The micro-actuator of claim 1 wherein the damping material is a polymeric material.

7. The micro-actuator of claim 1 wherein the damping material is an organic material.

8. The micro-actuator of claim 1 wherein the damping material is selected from the group of polyacrylates, polycarbonates, polystyrenes, polyethelenes, polyimides, polyamides, and polyethers.

9. The micro-actuator of claim 1 wherein the damping material is slected from the group of DLC:

Si, DLC;

N, DLC;

W, DLC;

Ti.

10. The micro-actuator of claim 1 wherein the damping material is selected from the group of silicon based carbides, nitrides, oxides, oxycarbides, and oxynitrides.

11. The micro-actuator of claim 1 wherein the damping material is selected from the group of metal based carbides, nitrides, oxides, oxycarbides, and oxynitrides.

12. The micro-actuator of claim 1 wherein the damping material is selected from the group of TiC, WC, TiN, WN, WOC, WON, and TiO.

13. The micro-actuator of claim 1 wherein a dampening material is applied only to the skeleton to limit the penetration of humidity into the skeleton.

14. The micro-actuator of claim 1 wherein the means for damping the mass spring frequency of the skeleton includes applying a dampening material to the skeleton to limit the penetration of humidity into the skeleton.

15. The micro-actuator of claim 1 wherein the means for damping the mass spring frequency of the skeleton includes applying a dampening material to a portion of the flexible beams to limit the penetration of humidity into the flexible beams.

16. A disc drive comprising:

a micro actuator having a skeleton having flexible beams, a rotor portion, and a stator portion, the flexible beams connecting the rotor portion to the stator portion; and

a damping material, the damping material applied to only the flexible beam to limit the penetration of humidity into the flexible beam.

17. A method for damping a micro-actuator comprising the steps of:

providing a skeleton having a rotor portion and a stator portion, wherein a flexible beam connects the rotor and stator portions;

applying a dampening material only to the skeleton; and

using the skeleton in the micro-actuator.

18. The method of claim 17 wherein the step of applying a damping material comprises spinning and spraying on like a photoresist material.

19. The method of claim 17 wherein the step of applying a damping material comprises using a method from the group of vacuum techniques, CVD, PECVD, sputtering and electron beam process.

20. The method of claim 17 wherein the step of applying a damping material comprises applying a damping material to the entire skeleton.

21. The method of claim 17 wherein the step of applying a damping material comprises applying a damping material on the rotor and stator portion.

22. A micro-actuator comprising:

a skeleton having flexible beams, a rotor portion and a stator portion, the flexible beams connecting the rotor portion to the stator portion; and

means for dampening the mass spring frequency of the skeleton.

23. The micro-actuator of claim 22 wherein the skeleton has openings therein which form the flexible beams, the rotor portion and the stator portion, wherein the means for damping the mass spring frequency of the micro-actuator include applying a damping material to portion of the flexible beams, rotor portion and stator portion that define the openings in the skeleton.