Baseplate resonant axis optimization

• US 8,929,032 B2
• Filed: 09/30/2009
• Issued: 01/06/2015
• 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): Watko, Julie Anne
• Application Number:
  US12/570,777
• Publication Number:
  US 20110075302A1
• Time in Patent Office: 1,924 Days
• Field of Search: 360/244.5, 360/244.8, 360/244.9, 296/030.3
• US Class Current: 360/244.5
• 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. An apparatus comprising:

a head attached to an end of a baseplate;

the baseplate comprising a main section and a tilted section joined together by a deflection line, the main section being generally parallel with the adjacent disc surface and the tilted section tilting toward the disc surface such that the tilted section is closer to the disc surface than the main section, the tilted section causing a torsion axis of the main section and the tilted section to pass through the head when the head is flying above the disc surface.

2. The apparatus of claim 1 wherein the tilted section is tilted approximately 2 degrees toward the adjacent disc surface.

3. The apparatus of claim 1 further comprising at least one piezoelectric element mounted to the baseplate and configured to deform the baseplate to provide fine motion control of the head.

4. The apparatus of claim 1 wherein the tilted section comprises a T-shaped section.

5. The apparatus of claim 1 further comprising a load beam, wherein the load beam includes a first deflection line that angles a middle portion of the load beam away from an adjacent disc surface and a second deflection line between the first deflection line and the head that angles an end portion of the load beam towards the disc surface.

6. An apparatus comprising:

a load beam attached to a baseplate;

a head attached to an opposite end of the load beam from the baseplate;

the baseplate comprising a planar main section and a planar mass-shifted section, wherein the planar mass-shifted section is a center portion of the baseplate, and wherein the planar mass-shifted section is closer to an adjacent disc surface than the planar main section, the mass-shifted section causing a torsion axis of the planar main section and the planar mass shifted section to pass through the head when the head is flying above the adjacent disc surface.

7. The apparatus of claim 6 wherein the planar main section and the planar mass-shifted section are separated by one or more deflection lines.

8. The apparatus of claim 6 wherein the planar mass-shifted section further comprises a top portion adjacent the center portion with a first deflection line there between.

9. The apparatus of claim 8 wherein the top portion of the planar mass-shifted section and the main section are coplanar.

10. The apparatus of claim 8 wherein the main section is closer to the adjacent disc surface than the top portion of the planar mass-shifted section.

11. The apparatus of claim 8 wherein the center portion and the top portion make a T-shape.

12. The apparatus of claim 8 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.

13. An apparatus comprising

a load beam attached to a baseplate, wherein the load beam includes a first deflection line that angles a middle portion of the load beam away from an adjacent disc surface and a second deflection line between the first deflection line and the head that angles an end portion of the load beam towards the disc surface;

a head attached to an opposite end of the load beam from the baseplate;

the baseplate attached to a tilted surface of an actuator arm, the tilted surface causing a torsion axis of the apparatus to angle toward the head when the head is flying above an adjacent disc surface.

14. The apparatus of claim 13, wherein the torsion axis passes through the head.