Multiple degree of freedom actuator assemblies having flexure based pivot functionality

Patent metadata

Field	Value
Publication number	US-9355663-B1
Application number	US-201514682020-A
Country	US
Kind code	B1
Filing date	Apr 8, 2015
Priority date	Apr 8, 2015
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

An apparatus, according to one embodiment, includes: a head carriage assembly, a flexure coupling the head carriage assembly to a linear assembly, the linear assembly being configured to move along a fine motion direction, and a motor coupled to the head carriage assembly for rotatably positioning the head carriage assembly about an axis of skew which extends perpendicular to a plane defined by an intended direction of media movement across the head carriage assembly and the fine motion direction, the fine motion direction being oriented perpendicular to the intended direction of media movement. The flexure permits the rotatable positioning of the head carriage assembly about the axis of skew. Moreover, the flexure resists pitching movement of the head carriage assembly relative to the linear assembly.

First claim

What is claimed is:

1. An apparatus, comprising:
a head carriage assembly;
a flexure coupling the head carriage assembly to a linear assembly, the linear assembly being configured to move along a fine motion direction; and
a motor coupled to the head carriage assembly for rotatably positioning the head carriage assembly about an axis of skew which extends perpendicular to a plane defined by an intended direction of media movement across the head carriage assembly and the fine motion direction, the fine motion direction being oriented perpendicular to the intended direction of media movement; and
an anti-sway flexure coupled between the head carriage assembly and the linear assembly, the anti-sway flexure being configured to reduce motion of the head carriage assembly in the intended direction of media movement,
the flexure permitting the rotatable positioning of the head carriage assembly about the axis of skew, the flexure resisting pitching movement of the head carriage assembly relative to the linear assembly.

2. The apparatus as recited in claim 1 , wherein no pivot pin extends along the axis of skew.

3. The apparatus as recited in claim 1 , wherein at least a second flexure extends between the head carriage assembly and the linear assembly, wherein the flexures are positioned towards outer extents of the head carriage assembly.

4. The apparatus as recited in claim 3 , wherein the flexures are positioned symmetrically relative to one another about the axis of skew.

5. The apparatus as recited in claim 3 , wherein at least third and fourth flexures are present, the third and fourth flexures extending between the head carriage assembly and the linear assembly, wherein the third and fourth flexures are positioned towards outer extents of the head carriage assembly.

6. The apparatus as recited in claim 1 , wherein a mounting point of the flexure to the head carriage assembly is offset from a mounting point of the flexure to the linear assembly in the fine motion direction.

7. The apparatus as recited in claim 1 , wherein the flexure has a rectangular cross section taken perpendicular to a longitudinal axis thereof, wherein a dimension of the cross section is longer in the fine motion direction than the intended direction of media movement.

8. The apparatus as recited in claim 1 , wherein the flexure extends from the head carriage assembly to the linear assembly in a direction generally parallel to the axis of skew.

9. The apparatus as recited in claim 1 , wherein the flexure has a generally L-shaped profile.

10. The apparatus as recited in claim 1 , wherein the motor is an electromagnetic motor.

11. The apparatus as recited in claim 10 , wherein a current applied to the electromagnetic motor induces a movement of the head carriage assembly about the axis of skew for positioning the head carriage assembly relative to the intended direction of media movement.

12. The apparatus as recited in claim 1 , wherein the flexure is directly coupled to the head carriage assembly and the linear assembly, wherein the flexure is configured to resist the pitching movement by the direct coupling.

13. An apparatus as recited in claim 1 , comprising:
a magnetic head mounted to the head carriage assembly;
a drive mechanism for passing a magnetic medium over the magnetic head; and
a controller electrically coupled to the motor.

14. An apparatus, comprising:
a head carriage assembly;
a flexure coupling the head carriage assembly to a linear assembly, the linear assembly being configured to move along a fine motion direction; and
a motor coupled to the head carriage assembly for rotatably positioning the head carriage assembly about an axis of skew which extends perpendicular to a plane defined by an intended direction of media movement across the head carriage assembly and the fine motion direction, the fine motion direction being oriented perpendicular to the intended direction of media movement;
the flexure permitting the rotatable positioning of the head carriage assembly about the axis of skew, the flexure resisting pitching movement of the head carriage assembly relative to the linear assembly,
wherein at least a second flexure extends between the head carriage assembly and the linear assembly, wherein the flexures are positioned towards outer extents of the head carriage assembly,
wherein the flexures are coupled to the head carriage assembly along a line traversing and oriented perpendicular to the axis of skew and about centered relative to a head receiving portion of the head carriage assembly.

15. An apparatus, comprising:
a head carriage assembly;
a flexure coupling the head carriage assembly to a linear assembly, the linear assembly being configured to move along a fine motion direction; and
a motor coupled to the head carriage assembly for rotatably positioning the head carriage assembly about an axis of skew which extends perpendicular to a plane defined by an intended direction of media movement across the head carriage assembly and the fine motion direction, the fine motion direction being oriented perpendicular to the intended direction of media movement;
the flexure permitting the rotatable positioning of the head carriage assembly about the axis of skew, the flexure resisting pitching movement of the head carriage assembly relative to the linear assembly,
wherein the flexure extends and bends along the axis of skew.

16. The apparatus as recited in claim 15 , wherein the flexure is a single piece of material.

17. The apparatus as recited in claim 15 , wherein the flexure has a pivot portion extending between main beams, the pivot portion having a smaller width than a width of each of the main beams.

18. The apparatus as recited in claim 17 , wherein the pivot portion is tapered such that the pivot portion becomes wider as it approaches each of the main beams.

19. The apparatus as recited in claim 15 , wherein the flexure is the sole component coupling the head carriage assembly to the linear assembly.

Assignees

• IBM

Inventors

• Harper David H F
• Rothuizen Hugo E

Classifications

• G11B5/5504

  across tape tracks · CPC title

• G11B5/4893

  relative to moving tape · CPC title

• G11B5/4873 Primary

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

• G11B5/584 Primary

  for track following on tapes · CPC title

• G11B5/56

  with provision for moving the head {support} for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering ({G11B5/52,} G11B5/54, G11B5/58 take precedence) · CPC title