Head gimbal assemblies and methods for measuring slider parameters
View Patent ↗A head gimbal assembly (HGA) for a disk drive is disclosed. The HGA includes a load beam, a flexure, and a slider attached to the load beam by the flexure. The load beam comprises one or more apertures configured to pass a laser beam at each of at least three non collinear points to measure at least one slider parameter. The method for measuring at least one slider parameter includes positioning the slider over a rotating medium and projecting a laser beam through the one or more apertures in the load beam.
1. A head gimbal assembly (HSA) for a disk drive, comprising:
a load beam;
a flexure; and
a slider attached to the load beam by the flexure;
wherein the load beam comprises one or more apertures configured to pass a laser beam at each of at least three non collinear points to measure at least one slider parameter.
2. The suspension assembly of claim 1 wherein said at least one slider parameter comprises at least one of displacement, velocity, and acceleration of the slider with respect to a rotating medium.
3. The suspension assembly of claim 1 wherein the load beam further comprises a gimbal dimple, and wherein three of said at least three non collinear points are arranged at vertices a triangle surrounding the gimbal dimple.
4. The suspension assembly of claim 1 wherein the one or more apertures comprises at least three non collinear apertures.
5. The suspension assembly of claim 4 wherein each of the three or more non collinear apertures is substantially round.
6. The suspension assembly of claim 4 wherein the load beam further comprises a gimbal dimple, and wherein three of said at least three non collinear apertures are arranged at vertices a triangle surrounding the gimbal dimple.
7. The suspension assembly of claim 1 wherein the one or more apertures comprises a substantially round aperture and a slot.
8. The suspension assembly of claim 7 wherein the load beam further comprises a gimbal dimple, and wherein the substantially round aperture and two ends of the slot are arranged at vertices of a triangle surrounding the gimbal dimple.
9. The suspension assembly of claim 1 wherein the slider is attached to the flexure by adhesive applied to at least one bonding area between the slider and the flexure, and wherein the one or more apertures are arranged such that the laser beam can be focused on one or more of said at least one bonding area.
10. A method of measuring at least one slider parameter in a head gimbal assembly (HGA) for a disk drive, wherein the HGA comprises a load beam, a flexure, and a slider attached to the load beam by the flexure, the method comprising:
positioning the slider over a rotating medium; and
projecting a laser beam through one or more apertures in the load beam to measure said at least one slider parameter.
11. The method of claim 10 wherein said at least one slider parameter comprises at least one of displacement, velocity, and acceleration of the slider with respect to the rotating medium.
12. The method of claim 10 wherein the laser beam is projected using a laser Doppler vibrometer.
13. The method of claim 9 wherein the laser beam is projected through the one or more apertures in the load beam at each of at least three non collinear points.
14. The method of claim 13 wherein the load beam further comprises a gimbal dimple, and wherein three of said at least three non collinear points are arranged at vertices of a triangle surrounding the gimbal dimple.
15. The method of claim 10 wherein the one or more apertures comprises at least three non collinear apertures.
16. The method of claim 15 wherein each of said at least three non collinear apertures is substantially round.
17. The method of claim 16 wherein the load beam further comprises a gimbal dimple, and wherein three of said at least three non collinear points are arranged at vertices a triangle surrounding the gimbal dimple.
18. The method of claim 10 wherein the one or more apertures comprises a substantially round aperture and a slot.
19. The method of claim 18 wherein the load beam further comprises a gimbal dimple, and wherein the substantially round aperture and two ends of the slot are arranged at vertices of a triangle surrounding the gimbal dimple.
20. The method of claim 10 wherein the slider is attached to the flexure by adhesive applied to a bonding area between the slider and the flexure, and wherein the projection of the laser beam through the one or more apertures of the load beam comprises focusing the laser beam on the bonding area.