Suspension arm and slider contact for magnetic storage device
Disclosed herein is a magnetic storage device that comprises a suspension arm co-movably fixed to a carriage arm. The suspension arm comprises a slider attachment side and at least one first electrical contact pad on the slider attachment side. The suspension arm also comprises a slider co-movably fixed to the suspension arm. The slider comprises a suspension attachment side, a non-head side facing the suspension arm and intersecting the suspension attachment side at a first slider edge of the slider, a head side facing away from the suspension arm, and at least one electrical contact component on the suspension attachment side up to the first slider edge. At least one solder weldment is directly coupled to the at least one first electrical contact pad and the at least one electrical contact component. Additionally, a read-write head is coupled to the head side of the slider.
1. A magnetic storage device, comprising:
a magnetic disk;
a carriage arm rotatably movable relative to the magnetic disk;
a suspension arm co-movably fixed to the carriage arm, wherein the suspension arm comprises:
a slider attachment side; and
at least one first electrical contact pad on the slider attachment side;
a slider co-movably fixed to the suspension arm, wherein the slider comprises:
a base having a suspension attachment side, a non-head side facing the suspension arm and intersecting the suspension attachment side at a first slider edge of the base, and a head side opposite the non-head side and facing away from the suspension arm, wherein the suspension attachment side extends between the non-head side and the head side of the base; and
at least one second electrical contact pad attached to the suspension attachment side of the base, and comprising:
a first portion on the suspension attachment side of the base; and
a second portion protruding from the first portion away from the suspension attachment side at an angle with respect to the first portion, and having a maximum width, in a virtual plane substantially parallel to the suspension attachment side, wherein the maximum width of the second portion is less than a maximum width of the first portion in the virtual plane;
at least one solder weldment directly coupled to the at least one first electrical contact pad and the at least one second electrical contact pad; and
a read-write head coupled to the head side of the base.
2. The magnetic storage device according to claim 1 , wherein the second portion of the at least one second electrical contact pad further comprises a first second-portion edge and a second second-portion edge, wherein a portion of the second portion within a hypothetical square, parallel to the suspension attachment side of the base and projected onto the slider, is less than nine-tenths of a portion of the first portion within the hypothetical square, and wherein:
a first side of the hypothetical square is aligned with a first side of the first portion;
a second side of the hypothetical square is perpendicular to the first side and is aligned with the first second-portion edge of the second portion; and
a third side of the hypothetical square is parallel to the second side and is aligned with the second second-portion edge of the second portion.
3. The magnetic storage device of claim 2 , wherein the portion of the second portion within the hypothetical square is less than half of the portion of the first portion within the hypothetical square.
4. The magnetic storage device of claim 1 , wherein the solder weldment is further directly coupled to the first portion and the second portion of the at least one second electrical contact pad.
5. The magnetic storage device of claim 1 , wherein:
a width of the first portion of the at least one second electrical contact pad varies along a length of the first portion; and
a width of the second portion of the at least one second electrical contact pad varies along a length of the second portion.
6. The magnetic storage device of claim 5 , wherein:
the width of the first portion of the at least one second electrical contact pad increases along the length of the first portion in a first direction away from the non-head side of the base; and
the width of the second portion of the at least one second electrical contact pad decreases along the length of the second portion in the first direction away from the non-head side of the base.
7. The magnetic storage device of claim 5 , wherein the first portion is symmetrical.
8. The magnetic storage device of claim 5 , wherein the first portion is asymmetrical.
9. The magnetic storage device of claim 1 , wherein:
the suspension arm comprises at least twelve first electrical contact pads on the slider attachment side;
the at least one first electrical contact pad comprises an electrical contact pad of the at least twelve first electrical contact pads;
the slider comprises at least twelve second electrical contact pads;
the at least one second electrical contact pad comprises an electrical contact pad of the at least twelve second electrical contact pads; and
the magnetic storage device comprises at least twelve weldments each directly coupled to corresponding ones of the at least twelve first electrical contact pads and the at least twelve second electrical contact pads.
10. The magnetic storage device of claim 1 , wherein:
the second portion further comprises a first second-portion edge and a second second-portion edge;
the first second-portion edge is spaced apart from the first portion; and
the second second-portion edge adjoins the first portion along a bend between the first portion and the second portion.
11. The magnetic storage device of claim 10 , wherein:
the first second-portion edge has a width, in the virtual plane, that is less than the maximum width of the second portion; and
a width of the second second-portion edge is equal to the maximum width of the second portion.
12. The magnetic storage device of claim 10 , wherein the first second-portion edge is curved.
13. The magnetic storage device of claim 1 , wherein the first portion comprises at least one slit extending from a side of the first portion toward a center line of the first portion.
14. A read-write head assembly for a magnetic storage device, comprising:
a suspension arm, wherein the suspension arm comprises:
a slider attachment side; and
at least one first electrical contact pad on the slider attachment side;
a slider co-movably fixed to the suspension arm, wherein the slider comprises:
a base having a suspension attachment side, a non-head side facing the suspension arm and intersecting the suspension attachment side at a first slider edge of the base, and a head side opposite the non-head side and facing away from the suspension arm, wherein the suspension attachment side extends between the non-head side and the head side of the base; and
at least one second electrical contact pad attached to the suspension attachment side of the base, and comprising:
a first portion on the suspension attachment side of the base; and
a second portion protruding from the first portion away from the suspension attachment side at an angle with respect to the first portion and having a maximum width, in a virtual plane substantially parallel to the suspension attachment side, wherein the maximum width of the second portion is less than a maximum width of the first portion in the virtual plane;
at least one solder weldment directly coupled to the at least one first electrical contact pad and the at least one second contact pad; and
a read-write head coupled to the head side of the base.
15. The read-write head assembly of claim 14 , wherein the second portion has a semi-circular shape.
16. The read-write head assembly of claim 14 , wherein the second portion has a trapezoidal shape.
17. The read-write head assembly of claim 14 , wherein the at least one second electrical contact pad further comprises an additional second portion protruding from the first portion away from the suspension attachment side at an angle with respect to the first portion.
18. The read-write head assembly of claim 14 , wherein the at least one second electrical contact pad further comprises an anti-wetting layer disposed over the first portion.
19. The read-write head assembly of claim 18 , wherein the anti-wetting layer has a maximum width that is greater than the maximum width of the first portion.
20. A method of making a magnetic storage device, the method comprising:
forming at least one second electrical contact pad on a base of a slider so that:
a width of a first portion of the at least one second electrical contact pad is greater than a width of a second portion of the at least one second electrical contact pad; and
the second portion protrudes from the first portion away from the base of the slider at an angle with respect to the first portion and the base of the slider; and
soldering at least one first electrical contact pad of a suspension arm to the at least one second electrical contact pad of the slider via at least one solder ball so that the solder ball reflows over at least part of the first portion and at least part of the second portion of the at least one second electrical contact pad.