What is claimed is:
1. A slider for actively controlling a fly height of the slider relative to a data storage disc, the slider comprising:
a slider body having an air bearing surface, a back surface opposite the air bearing surface, a length, a width, a longitudinal axis, a transversal axis, a crown curvature located on the air bearing surface along the length of the slider body and a cross curvature located on the air bearing surface along the width of the slider body; and
a first plurality of beams that are disassociated from one another, constructed of deformable material and affixed to said back surface of the slider body, wherein each beam within the first plurality of beams, in response to an applied electrical control signal, is deformable in a first dimension parallel to the back surface of the slider body.
2. The slider of claim 1 and further including a bridge structure attached to each beam within the first plurality of beams.
3. The slider of claim 1 wherein the first plurality of beams is deformable to a greater extent along one of the longitudinal and transversal axes than along the other of the longitudinal and transversal axes, and wherein a deformation of the first plurality of beams induces a change in one of the crown and cross curvature to a greater extent than the other of the crown and cross curvature.
4. The slider of claim 3 wherein the first plurality of beams are substantially parallel to one another and substantially parallel to one of the longitudinal and transversal axes.
5. The slider of claim 4 wherein said first plurality of beams comprises:
a first pair of parallel beams, wherein each beam within said first pair of parallel beams is positioned symmetrically from the other with respect to one of the longitudinal and transversal axes of the slider body.
6. The slider of claim 5 wherein each beam within said first pair of parallel beams includes a length that coincides with one of the length of the slider body and the width of the slider body.
7. The slider of claim 1 and further including a second plurality of beams that are disassociated from one another, constructed of deformable material and affixed to said first plurality of beams, wherein each beam within said second plurality of beams, in response to an applied electrical control signal, is deformable in a second dimension substantially parallel to the back surface of the slider body.
8. The slider of claim 7 and further including a bridge structure attached to each beam within at least one of the first and second plurality of beams.
9. The slider of claim 7 wherein each beam within the first plurality of beams is deformable to a greater extent along one of the longitudinal and transversal axes, and wherein each beam within the second pair of parallel beams is deformable to a greater extent along the other of the longitudinal and transversal axes, and wherein a deformation of the second plurality of beams, in combination with a deformation of the first plurality of beams, induces a change in one of the crown and cross curvature to a greater extent than the other of the crown and cross curvature.
10. The slider of claim 9 wherein said first plurality of beams comprises a first pair of parallel beams, and said second plurality of beams comprises a second pair of parallel beams, wherein each beam within said first pair of parallel beams is positioned symmetrically from the other with respect to one of the longitudinal and transversal axes, wherein each beam within said second pair of parallel beams is positioned symmetrically from the other with respect to the other of the longitudinal and transversal axes, and wherein the second pair of parallel beams is affixed to the first pair of parallel beams such that said first and said second pair of parallel beams are positioned substantially perpendicular to one another.
11. The slider of claim 10 wherein each beam within each of the first and second pair of parallel beams includes a length that coincides with one of the length and width of the slider body.
12. A slider for actively controlling a fly height of the slider relative to a data storage disc, the slider comprising:
a slider body having an air bearing surface, a back surface opposite the air bearing surface, a length, a width, a longitudinal axis, a transversal axis, a crown curvature located on the air bearing surface along the length of the slider body and a cross curvature located on the air bearing surface, along the width of the slider body; and
a first layer of deformable, anisotropic material affixed to said back surface of the slider body and having a length and width that respectively and substantially coincide with said length and width of the slider body.
13. The slider of claim 12 wherein the first layer of deformable anisotropic material is piezoelectric and is fabricated so that a dimensional change that occurs in the first layer in response to an electrical control signal being applied thereto is in a plane substantially parallel to the back surface of the slider body to a greater extent along one of the longitudinal and transversal axes than along the other of the longitudinal and transversal axes, and wherein a deformation of the first layer induces a change in one of the crown and cross curvature to a greater extent than the other of the crown and cross curvature.
14. The slider of claim 13 and further including a second layer of deformable anisotropic material having a length and width that respectively and substantially coincide with said length and said width of the slider body, wherein said second layer of deformable material is affixed to said first layer of deformable anisotropic material.
15. The slider of claim 14 wherein the second layer is fabricated so that a dimensional change that occurs in the deformable anisotropic material in response to an electrical control signal being applied thereto is in a plane substantially parallel to the back surface of the slider body to a greater extent along one of the longitudinal and transversal axes than along the other of the longitudinal and transversal axes, and wherein a deformation of the second layer of deformable material, in combination with a deformation of the first layer of deformable material, induces a change in one of the crown and cross curvature to a greater extent than the other of the crown and cross curvature.
16. A method of manufacturing an active fly height control device, comprising:
attaching a first plurality of piezoelectric devices to a first wafer;
attaching a second plurality of piezoelectric devices to a second wafer;
joining the first plurality of piezoelectric devices to the second plurality of piezoelectric devices; and
releasing one of the first and second wafers from one of the first and second plurality of piezoelectric devices.
17. The method of claim 16, further comprising:
cutting at least one of the first and second plurality of piezoelectric devices into desired shapes before they are joined to one another.
18. The method of claim 16, further comprising:
joining the one of the first and second plurality of piezoelectric devices from which the wafer has been released to a plurality of sliders; and
releasing the other of the first and second wafers.
19. A disc drive comprising:
a disc rotatable about a central axis and having a recording surface; and
disc head slider means for carrying a transducer at a fly height relative to the recording surface during rotation of the disc and for actively altering at least one of a crown curvature and cross curvature of the disc head slider to a greater extent than the other of the crown and cross curvatures to adjust the fly height during rotation of the disc.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An agricultural composition comprising at least one agricultural chemical and at least one cellulose ether,
wherein the cellulose ether is a nonionic MEHEC polymer having a degree of substitution of greater than about 0.3 for methyl, and a degree of substitution of greater than about 0.2 for ethyl, and
wherein the composition is substantially free of aluminosilicate mineral.
2. The agricultural composition of claim 1 wherein the MEHEC polymer has an average molar substitution of ethylene oxide of greater than about 0.8.
3. The agricultural composition of claim 1 wherein the MEHEC polymer has a viscosity of greater than 5000 cps measured at 1% in water at pH=7 using a Brookfield viscometer type LV at 12 rpm using spindle number 3 at 20 degree C. in a container with diameter of 6.5 cm.
4. The agricultural composition of claim 1 wherein the agricultural composition comprises 0.01-0.5 wt % of the MEHEC polymer and more than about 50 wt % of water.
5. The agricultural composition of claim 1 wherein the agricultural chemical is a pesticide.
6. The agricultural composition of claim 5 wherein the pesticide is selected from the group consisting of a herbicide, a fungicide, and an insecticide.
7. The agricultural composition of claim 6 wherein the pesticide is a herbicide.
8. The agricultural composition of claim 7 wherein the herbicide is selected from the group consisting of glyphosate, 2,4-D, and dicamba.
9. A method for reducing spray drift during the spraying of an aqueous solution, the method comprising:
providing a nonionic MEHEC polymer;
combining the MEHEC polymer with at least one agricultural chemical to obtain the aqueous solution; and
spraying the aqueous solution,
wherein the MEHEC polymer has a degree of substitution of greater than about 0.3 for methyl and a degree of substitution of greater than about 0.2 for ethyl.
10. The method of claim 9 wherein the MEHEC polymer has an average molar of substitution of ethylene oxide of greater than about 0.8.
11. The method of claim 9 or 10 wherein the MEHEC polymer has a viscosity of greater than 5000 cps measured at 1% in water with pH=7 using a Brookfield viscometer type LV at 12 rpm using spindle number 3 at 20 degree C. in a container with 6.5 cm diameter.
12. The method of claim 9 wherein the agricultural composition comprises 0.01-0.5 wt % of the MEHEC polymer and more than about 50 wt % of water.
13. The method of claim 9 wherein the volume of fine droplets of <150 microns is reduced by >30% during the spraying of the aqueous solution.
14. The method of claim 9 wherein the volume of fine droplets of <150 microns is reduced by >40% during the spraying of the aqueous solution.
15. The method of any onc of claims 9-44 wherein the agricultural chemical is a pesticide.
16. The method of claim 15 wherein the pesticide is selected from the group consisting of a herbicide, a fungicide, and an insecticide.
17. The method of claim 16 wherein the pesticide is a herbicide.
18. The method of claim 17 wherein the herbicide is selected from the group consisting of glyphosate, 2,4-D, and dicamba.
19. A method for increasing resistance to rain wash off of an aqueous solution sprayed onto a surface, the method comprising:
providing a nonionic MEHEC polymer;
combining the MEHEC polymer with at least one agricultural chemical to obtain the aqueous solution; and
spraying the aqueous solution onto the surface.
20. The method of claim 19 wherein the MEHEC polymer has a degree of substitution of greater than about 0.3 for methyl and a degree of substitution of greater than about 0.2 for ethyl.
21. The method of claim 19 wherein the MEHEC polymer has an average molar of substitution of ethylene oxide of greater than about 0.8.
22. The method of any one of claims 19 wherein the MEHEC polymer has a viscosity of greater than 5000 cps measured at 1% in water at pH=7 using a Brookfield viscometer type LV at 12 rpm using spindle number 3 at 20 C with a container with diameter of 6.5 cm.
23. The method of claim 19 wherein the agricultural composition comprises 0.01-0.5 wt % of the MEHEC polymer and more than about 50 wt % of water.
24. The method of claim 19 wherein the agricultural chemical is a pesticide.
25. The method of claim 24 wherein the pesticide is selected from the group consisting of a herbicide, a fungicide, and an insecticide.
26. The method of claim 25 wherein the pesticide is a herbicide.
27. The method of claim 26 wherein the herbicide is selected from the group consisting of glyphosate, 2,4-D, and dicamba.
28. The method of any one of claims 19 wherein the surface is a plant surface.