Sealed laminated electrical connector for helium filled disk drive
View Patent ↗A novel disk drive includes a hermetically sealed helium-filled enclosure that has an opening extending through the disk drive base. A laminated electrical connector is disposed inside the enclosure, spans the opening, and is accessible from outside the disk drive base via the opening. The laminated electrical connector has an adhesive layer that is adhered to the disk drive base continuously around the opening, and that has a hole therethrough that is aligned with the opening. The laminated electrical connector includes electrically conductive traces that are electrically connected to the actuator flex cable, and a first insulative layer that is disposed on the trace layer. The laminated electrical connector has a metal foil sealing layer that continuously spans and completely covers the opening, and that has no holes therethrough that are aligned with the opening. The metal foil sealing layer overlaps the adhesive layer continuously around the opening.
1. A disk drive comprising:
a hermetically sealed enclosure including a disk drive base and a top cover attached to the disk drive base, the enclosure being helium-filled and having an opening extending through the disk drive base;
a spindle motor attached to the disk drive base;
a head actuator disposed in the enclosure and including a voice coil motor;
a flex cable being disposed in the enclosure and being attached to the head actuator, the flex cable being electrically connected to the voice coil motor; and
a laminated electrical connector disposed inside the enclosure, the laminated electrical connector spanning the opening and being accessible from outside the disk drive base via the opening, the laminated electrical connector comprising a plurality of layers, the plurality of layers including
an adhesive layer adhered to the disk drive base continuously around the opening, the adhesive layer having a hole therethrough that is aligned with the opening;
a trace layer that includes a plurality of electrically conductive traces including a first subset of electrically conductive traces that are electrically connected to the flex cable;
a first insulative layer disposed on the trace layer;
a metal foil sealing layer that continuously spans and completely covers the opening, the metal foil sealing layer having no holes therethrough that are aligned with the opening, the metal foil sealing layer overlapping the adhesive layer continuously around the opening, the trace layer and the first insulative layer being disposed between the metal foil sealing layer and the adhesive layer; and
a stiffener layer, the metal foil sealing layer being disposed between the stiffener layer and the adhesive layer.
2. The disk drive of claim 1 further comprising a second insulative layer that is disposed between the trace layer and the adhesive layer, and wherein the trace layer is affixed to the disk drive base via the second insulative layer.
3. The disk drive of claim 1 wherein the stiffener layer is a metal stiffener layer.
4. The disk drive of claim 1 , wherein the spindle motor includes a plurality of electrical terminals, and wherein the plurality of electrically conductive traces includes a second subset of electrically conductive traces that extends to and connects to the plurality of electrical terminals.
5. The disk drive of claim 4 wherein the metal foil sealing layer extends to the plurality of electrical terminals and completely covers the second subset of electrically conductive traces.
6. The disk drive of claim 1 wherein the metal foil sealing layer comprises copper foil.
7. The disk drive of claim 1 wherein the adhesive layer defines an adhesive layer thickness in the range 25 to 50 microns.
8. The disk drive of claim 1 wherein the metal foil sealing layer defines a metal foil thickness in the range 12 to 50 microns.
9. The disk drive of claim 1 wherein the stiffener layer defines a stiffener layer thickness in the range 0.25 to 3 mm.
10. The disk drive of claim 1 wherein the first insulative layer comprises polyimide having a thickness in the range 10 to 50 microns.
11. The disk drive of claim 1 wherein the adhesive layer comprises an epoxy adhesive.
12. The disk drive of claim 1 wherein the laminated electrical connector includes a middle portion and at least one wing portion, and wherein the wing portion is folded over the middle portion.
13. The disk drive of claim 2 wherein the second insulative layer is on a second metal foil that faces the adhesive layer.
14. The disk drive of claim 2 wherein the laminated electrical connector includes a middle portion and at least one wing portion, and wherein the wing portion is folded over the middle portion.
15. The disk drive of claim 14 wherein the second insulative layer includes at least one window therethrough and over a portion of the trace layer.
16. The disk drive of claim 3 further comprising a third insulative layer disposed between the metal foil sealing layer and the metal stiffener layer.