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Slider location in head gimbal assemblies using indicia instead of dimple

Imported: 23 Feb '17 | Published: 22 Oct '02

Robert Summers, Daniel Vera

USPTO - Utility Patents

Abstract

Problems aligning a slider with a dimple in manufacture of head gimbal assemblies for disk drive suspensions are obviated by defining optically readable indicia that serve as a reference for positioning apparatus rather than the dimple.

Description

BRIEF DESCRIPTION OF THE DRAWING

The invention will be further described as to an illustrative embodiment in conjunction with the attached drawings in which:

FIG. 1 is a plan view of the invention head gimbal assembly in which the dimple is formed on the load beam;

FIG. 2 is a plan view of the invention head gimbal assembly in which the dimple is formed on the flexure tongue;

FIG. 3 is a plan view of the invention head gimbal assembly in which the flexure dimple has a series of annular rings forming the optical indicia;

FIG. 4 is a view taken on line

4

4 in FIG. 1;

FIG. 5 is a view like FIG. 3, having a different pattern of optical indicia; and

FIGS. 6,

7 and

8 are fragmentary views of particular optical indicia shapes, patterns and distributions;

FIG. 9 is a view like FIG. 1 of an alternate embodiment; and,

FIG. 10 is a view taken on line

10

10 in FIG.

9.

Claims

1. A head gimbal assembly of a load beam, a flexure attached to said load beam and having a tongue, and a slider attached to said flexure tongue, said load beam and flexure tongue defining between them a dimple positioned, sized and shaped to allow gimballing movement of said slider, and readable indicia having a known positional relation to said dimple for precisely locating said slider opposite said dimple by reference to said readable indicia rather than said dimple.

2. The head gimbal assembly according to claim 1, in which said load beam defines said dimple.

3. The head gimbal assembly according to claim 2, in which said flexure tongue is shaped to expose at least portions of said dimple and said readable indicia from the side of said flexure tongue remote to said dimple.

4. The head gimbal assembly according to claim 1, in which said dimple has a periphery, and said readable indicia are located a known distance and direction from said dimple periphery.

5. The head gimbal assembly according to claim 4, in which said readable indicia are sharper edged than said dimple edge with said load beam or flexure tongue.

6. The head gimbal assembly according to claim 1, in which said flexure tongue defines said dimple.

7. The head gimbal assembly according to claim 1, in which said readable indicia comprise a series of circular indicia.

8. The head gimbal assembly according to claim 1, in which said readable indicia comprise a series of polygonal indicia.

9. The head gimbal assembly according to claim 8, in which said polygonal shaped readable indicia are diamond shaped in longitudinal cross-section.

10. The head gimbal assembly according to claim 1, in which said readable indicia comprise a series of arcuate indicia.

11. The head gimbal assembly according to claim 1, in which said readable indicia are semi-circular in longitudinal cross-section.

12. The head gimbal assembly according to claim 1, in which said indicia comprise a series of annular segment slots.

13. The head gimbal assembly according to claim 1, in which said readable indicia comprise a series of arcuate slots.

14. The head gimbal assembly according to claim 13, in which said readable indicia are located both within and without the periphery of said dimple.

15. The method of mounting sliders onto flexure tongues carried by a load beam in intended registration with a dimple that cannot be seen when registering the slider with the dimple, including forming readable indicia on the load beam having a known positional relation to said dimple, and guiding placement of the slider on the flexure tongue with reference to said readable indicia rather than said dimple.

16. The method according to claim 15, including also forming said dimple on said load beam, said flexure tongue having a shape to expose said readable indicia for reading.

17. The method according to claim 15, including also forming said dimple said flexure tongue.

18. The method according to claim 15, including also forming a series of circular indicia on said load beam as said readable indicia.

19. The method according to claim 18, including also forming a series of arcuate indicia located on said load beam as said readable indicia.

20. The method according to claim 18, including also forming said arcuate indicia to be semi-circular in longitudinal cross-section.

21. The method according to claim 18, including also forming a series of slots distributed on said load beam as said readable indicia.

22. The method according to claim 18, including also locating readable indicia both within and without the periphery of said dimple.

23. The method according to claim 15, including also forming a series of polygonal indicia on said load beam as said readable indicia.

24. The method according to claim 23, including also forming said polygonal indicia to be diamond shaped in longitudinal cross-section.