Compliant air bearing slider
View Patent ↗A compliant, flexible air bearing slider (ABS) reduces the contact forces between the slider and disk, thereby reducing excessive burnishing and wear and increasing the reliability of the slider. According to an embodiment, an ABS has at least one “compliance-enhancing feature” which reduces the bending mode vibration frequency of the slider. By causing the slider to flex, and bringing the bending mode vibration frequency closer to the pitch 2 eigenmode frequency, coupling of the different vibration modes can be obtained. Thus, the different vibration modes can effectively dampen each other and result in reduced contact forces between the slider and disk.
1. An air bearing slider, comprising:
a compliance-enhancing feature which affects slider bending mode frequency and slider pitch mode frequency, wherein said compliance-enhancing comprises one or more recesses in said slider.
2. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature configures the bending mode frequency of said slider to within 800 kHz of a pitch 2 eigenmode frequency of said slider.
3. The air bearing slider recited in claim 2 , further comprising:
a piezoelectric element operating as an active damper by ensuring that said bending mode frequency and said pitch 2 eigenmode frequency are out of phase.
4. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises one or more recesses from a surface of said slider opposing an air bearing surface of said slider.
5. The air bearing slider recited in claim 4 , wherein the thickness of said slider is less than 190 microns.
6. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises one or more recesses from an air bearing surface of said slider and one or more recesses from a surface of said slider opposing said air bearing surface.
7. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises one or more recesses substantially transverse to said slider.
8. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises one or more recesses substantially longitudinal to said slider.
9. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature is located approximately coincident with a pitch 2 nodal axis of said slider.
10. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises one or more substantially vertical holes through said slider.
11. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises one or more substantially transverse holes through said slider.
12. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises a through-hole substantially transverse to said slider and located approximately coincident with a pitch 1 nodal axis of said slider.
13. The air bearing slider recited in claim 12 , wherein said through-hole has a rectangular profile.
14. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises a trench substantially transverse to said slider and located approximately coincident with a pitch 1 nodal axis of said slider, and wherein the depth of said trench is at least 10 percent of the depth of said slider.
15. The air bearing slider recited in claim 1 , wherein said compliance-enhancing feature comprises a trench substantially transverse to said slider and located approximately coincident with a pitch 2 nodal axis of said slider, and wherein the depth of said trench is at least 10 percent of the depth of said slider.
16. A hard disk drive device comprising:
a base;
a magnetic storage medium assembly coupled with said base, said magnetic storage medium rotatable relative to said base; and
one or more actuator arms housing a corresponding slider housing a corresponding read/write head for reading data from and writing data to said magnetic storage medium, said slider comprising a compliance-enhancing feature which affects slider bending mode frequency and slider pitch mode frequency, wherein said compliance-enhancing comprises one or more recesses in said slider.
17. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature configures the bending mode frequency of said slider to within 800 kHz of a pitch 2 eigenmode frequency of said slider.
18. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises one or more recesses from a surface of said slider opposing said air bearing surface.
19. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises one or more recesses from a deep etch surface of an air bearing surface of said slider and one or more recesses from a surface of said slider opposing said air bearing surface.
20. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises one or more recesses substantially transverse to said slider.
21. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises one or more recesses substantially longitudinal to said slider.
22. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises one or more substantially vertical holes through said slider.
23. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises a through-hole substantially transverse to said slider and located approximately coincident with a pitch 1 nodal axis of said slider.
24. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises a trench substantially transverse to said slider and located approximately coincident with a pitch 1 nodal axis of said slider, and wherein the depth of said trench is at least 10 percent of the depth of said slider.
25. The hard disk drive device recited in claim 16 , wherein said compliance-enhancing feature comprises a trench substantially transverse to said slider and located approximately coincident with a pitch 2 nodal axis of said slider, and wherein the depth of said trench is at least 10 percent of the depth of said slider.