Baseplate resonant axis optimization

• US 10,643,655 B2
• Filed: 12/03/2014
• Issued: 05/05/2020
• Est. Priority Date: 09/30/2009
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Greminger, Michael Allen, Ver Meer, Bradley Jay, Mangold, Markus Erwin
• Primary Examiner(s): Vo, Peter Dungba
• Assistant Examiner(s): Parvez, Azm A
• Application Number:
  US14/559,092
• Publication Number:
  US 20150085400A1
• Time in Patent Office: 1,980 Days
• Field of Search: 360294, 3602448, 3602445, 3602449, 3602457, 2960303, 2960304, 2960305, 296037
• CPC Class Codes: G11B 17/32 Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing damping of vibrations of record carriers on turntables by fluid-dynamic means G11B19/2018
• CPC Class Codes: G11B 5/4833 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 Class Codes: Y10T 29/49032 Fabricating head structure or component thereof

Abstract

In one implementation, the presently disclosed technology teaches an apparatus with a head attached to an end of a baseplate. The baseplate includes a tilted section that causes a torsion axis of the baseplate to pass near the head. In another implementation, the presently disclosed technology teaches an apparatus with a load beam attached to a baseplate. The apparatus also includes a head attached to an opposite end of the load beam from the baseplate. The baseplate includes a mass-shifted section that causes a torsion axis of the apparatus to pass through the head. In yet another implementation, the presently disclosed technology teaches a method for reducing baseplate resonance amplitude. The method includes shifting a baseplate mass on a suspension toward an adjacent disc surface to move a baseplate torsion axis to pass near a head.

Claims

1. A method comprising:

positioning a head to access data from an adjacent disc surface, the head supported by a load beam attached to a baseplate, the baseplate including;

a planar main section and a mass-shifted section; and

at least one microactuator motor element positioned on the mass-shifted_section of the baseplate to provide fine position control of the head;

wherein the mass-shifted section includes a top portion and a center portion, the top portion being wider and further away from the adjacent disc surface than the center portion and coupled to the load beam, and wherein the mass-shifted section causing a torsion axis of the planar main section and the mass-shifted section to angle toward the head when the head is flying above the adjacent disc surface with the center portion of the mass-shifted section being closer to the adjacent disc surface than the planar main section.

2. The method of claim 1 wherein the planar main section and the mass-shifted section are separated by one or more deflection lines.

3. The method of claim 1, wherein the mass-shifted section further comprises a first deflection line between the top portion and the center portion.

4. The method of claim 3, wherein the top portion of the mass-shifted section and the planar main section are coplanar.

5. The method of claim 3, wherein the center portion and the top portion make a T-shape.

6. The method of claim 3, wherein the top portion comprises a first top portion adjacent a second deflection line and a second top portion adjacent a third deflection line, wherein the center portion separates the first top portion and the second top portion.

7. The method of claim 1, further comprising:

deforming the baseplate by actuating the at least one microactuator motor element mounted to the baseplate.

8. The method of claim 1 wherein the planar main section defines a first plane generally parallel to the adjacent disc surface and the mass-shifted section defines a second plane closer to the adjacent disc surface than the first plane.

9. The method of claim 1 the mass-shifted section causes a torsion axis of the planar main section and the mass-shifted section to pass through the head when the head is flying above the adjacent disc surface.

10. Apparatus comprising:

a load beam supported a head and attached to a baseplate, the baseplate including;

a planar main section and a mass-shifted section; and

at least one microactuator motor element positioned on a mass-shifted portion of the baseplate to provide fine position control of the head,

wherein the mass-shifted section includes a top portion and a center portion, the top portion being wider and further away from the adjacent disc surface than the center portion and coupled to the load beam, and wherein the mass-shifted section causing a torsion axis of the planar main section and the mass-shifted section to angle toward the head when the head is flying above the adjacent disc surface with the center portion of the mass-shifted section being closer to the adjacent disc surface than the planar main section.

11. The apparatus of claim 10, wherein the planar main section and the mass-shifted section are separated by one or more deflection lines.

12. The apparatus of claim 10, wherein the mass-shifted section further includes a first deflection line between the top portion and the center portion.

13. The apparatus of claim 12, wherein the top portion of the mass-shifted section and the planar main section are coplanar.

14. The apparatus of claim 12, wherein the center portion further couples to the planar main section.

15. The apparatus of claim 12, wherein the top portion comprises a first top portion adjacent a second deflection line and a second top portion adjacent a third deflection line, wherein the center portion separates the first top portion and the second top portion.

16. The apparatus of claim 10, wherein the baseplate includes at least one piezoelectric element to provide fine position control of the head.

17. The apparatus of claim 10, wherein the planar main section defines a plane generally parallel to the adjacent disc surface and the mass-shifted section defines a second plane closer to the adjacent disc surface than the first plane.

18. The apparatus of claim 10 wherein the mass-shifted section causes a torsion axis of the planar main section and the mass-shifted section to pass through the head when the head is flying above the adjacent disc surface.