Cleating features to improve adhesive interface between a bobbin and a coil of an actuator coil portion of a hard disk drive
View Patent ↗A disk drive includes a disk, and a head stack assembly for reading and writing to the disk. The head stack assembly may include a body portion defining a through bore that defines a pivot axis; an actuator arm cantilevered from the body portion; a head gimbal assembly coupled to the actuator arm; a coil portion cantilevered from the body portion in an opposite direction from the actuator arm and a bobbin. The coil portion may define first and second actuator fork members and may include a wound coil supported by the first and second actuator fork members. The bobbin may be configured to stiffen the coil, and may include a first surface that faces the coil and that defines the thickness of the bobbin. The first surface defines one or more cleating features configured to increase the surface area of the first surface. The largest dimension of each of the cleating features in a direction that is parallel to the pivot axis may be selected to be less than the thickness of the bobbin. An adhesive may be disposed between the first surface of the bobbin and the coil.
1. A disk drive, comprising:
a disk;
a head stack assembly for reading and writing to the disk, the head stack assembly comprising:
a body portion defining a through bore that defines a pivot axis;
an actuator arm cantilevered from the body portion;
a head gimbal assembly coupled to the actuator arm;
a coil portion cantilevered from the body portion in an opposite direction from the actuator arm, the coil portion defining first and second actuator fork members and including a wound coil supported by the first and second actuator fork members;
a bobbin configured to stiffen the wound coil, the bobbin including a first surface that faces the wound coil and that defines a thickness of the bobbin, the first surface defining a plurality of cleating features configured to increase a surface area of the first surface, a largest dimension of each of the plurality of cleating features in a direction parallel to the pivot axis being less than the thickness of the bobbin, and
an adhesive disposed between the first surface of the bobbin and the wound coil.
2. The disk drive of claim 1 , wherein the cleating feature defines a through bore configured to allow the adhesive to flow therethrough.
3. The disk drive of claim 2 , wherein the through bore defines a through bore axis that is substantially parallel to the pivot axis.
4. The disk drive of claim 2 , wherein the through bore defines a through bore axis that is substantially perpendicular to the pivot axis.
5. The disk drive of claim 1 , wherein at least one of the plurality of cleating features defines an extrusion relative to the first surface of the bobbin.
6. The disk drive of claim 1 , wherein at least one of the plurality of cleating features defines a recess relative to the first surface of the bobbin.
7. The disk drive of claim 1 , wherein one edge of at least one of the plurality of cleating features is aligned with an edge of the first surface of the bobbin.
8. The disk drive of claim 1 , wherein at least one of the plurality of cleating features is disposed between two substantially flat portions of the first surface.
9. A head stack assembly for reading and writing to a disk of a disk drive, comprising:
a body portion defining a through bore that defines a pivot axis;
an actuator arm cantilevered from the body portion;
a head gimbal assembly coupled to the actuator arm;
a coil portion cantilevered from the body portion in an opposite direction from the actuator arm, the coil portion defining first and second actuator fork members and including a wound coil supported by the first and second actuator fork members;
a bobbin configured to stiffen the wound coil, the bobbin including a first surface that faces the wound coil and that defines a thickness of the bobbin, the first surface defining a plurality of cleating features configured to increase a surface area of the first surface, a largest dimension of each of the plurality of cleating features in a direction parallel to the pivot axis being less than the thickness of the bobbin, and
an adhesive disposed between the first surface of the bobbin and the wound coil.
10. The head stack assembly of claim 9 , wherein the cleating feature defines a through bore configured to allow the adhesive to flow therethrough.
11. The head stack assembly of claim 10 , wherein the through bore defines a through bore axis that is substantially parallel to the pivot axis.
12. The head stack assembly of claim 10 , wherein the through bore defines a through bore axis that is substantially perpendicular to the pivot axis.
13. The head stack assembly of claim 9 , wherein at least one of the plurality of cleating features defines an extrusion relative to the first surface of the bobbin.
14. The head stack assembly of claim 9 , wherein at least one of the plurality of cleating features defines a recess relative to the first surface of the bobbin.
15. The head stack assembly of claim 9 , wherein one edge of at least one of the plurality of cleating features is aligned with an edge of the first surface of the bobbin.
16. The head stack assembly of claim 9 , wherein at least one of the plurality of cleating features is disposed between two substantially flat portions of the first surface.
17. An actuator arm assembly for a disk drive, comprising:
a body portion defining a through bore that defines a pivot axis;
an actuator arm cantilevered from the body portion;
a coil portion cantilevered from the body portion in an opposite direction from the actuator arm, the coil portion defining first and second actuator fork members and including a wound coil supported by the first and second actuator fork members;
a bobbin configured to stiffen the wound coil, the bobbin including a first surface that faces the wound coil and that defines a thickness of the bobbin, the first surface defining a plurality of cleating features configured to increase a surface area of the first surface, a largest dimension of each of the plurality of cleating features in a direction parallel to the pivot axis being less than the thickness of the bobbin, and
an adhesive disposed between the first surface of the bobbin and the wound coil.
18. The actuator arm assembly of claim 17 , wherein the cleating feature defines a through bore configured to allow the adhesive to flow therethrough.
19. The actuator arm assembly of claim 18 , wherein the through bore defines a through bore axis that is substantially parallel to the pivot axis.
20. The actuator arm assembly of claim 18 , wherein the through bore defines a through bore axis that is substantially perpendicular to the pivot axis.
21. The actuator arm assembly of claim 17 , wherein at least one of the plurality of cleating features defines an extrusion relative to the first surface of the bobbin.
22. The actuator arm assembly of claim 17 , wherein at least one of the plurality of cleating features defines a recess relative to the first surface of the bobbin.
23. The actuator arm assembly of claim 17 , wherein one edge of at least one of the plurality of cleating features is aligned with an edge of the first surface of the bobbin.
24. The actuator arm assembly of claim 17 , wherein at least one of the plurality of cleating features is disposed between two substantially flat portions of the first surface.