Hermetic sealing of hard disk drive using laminated film seal
A hermetically-sealed hard disk drive (HDD) utilizes a laminated film seal to seal an interface of an electrical flexible cable assembly and an HDD enclosure base. The laminated film seal may be constructed of a heat sealant layer that bonds with a surface of the base and a surface of the flex cable, a barrier layer which inhibits gas from escaping from inside the HDD, and a film surface protective layer which protects the heat sealant and barrier layers. Embodiments may include a heat sealant layer comprising a thermoplastic polymer such as polypropylene, a barrier layer comprising a metal such as aluminum, and a film surface protective layer comprising a thermoplastic polymer such as polyethylene terephthalate.
1. A hermetically-sealed hard disk drive having an internal space, the hard disk drive comprising:
an enclosure base enclosing at least a portion of said internal space;
an electrical flexible cable assembly (FCA) providing an electrical path from said internal space through said base to an outside environment, wherein said FCA comprises a base film and an electrical conductor layer coupled to said base film; and
a laminated film positioned over a portion of said FCA and sealing an interface of said FCA and said base, wherein said laminated film comprises:
a heat sealant layer bonded with said base and said FCA,
a barrier layer inhibiting escape of gas from said internal space, and
a film surface protective layer protecting said heat sealant and barrier layers.
2. The hard disk drive of claim 1 ,
wherein said FCA further comprises a cover layer over said electrical conductor layer; and
wherein said laminated film is positioned over and bonded with at least a portion of said cover layer of said FCA.
3. The hard disk drive of claim 2 , wherein said cover layer of said FCA and said heat sealant layer of said laminated film comprise a thermoplastic polymer.
4. The hard disk drive of claim 2 , wherein said cover layer of said FCA and said heat sealant layer of said laminated film comprise polypropylene.
5. The hard disk drive of claim 1 , further comprising:
a metal adhesive layer positioned between said base and at least a portion of said FCA; and
wherein a portion of said laminated film is positioned over and bonded with a portion of said adhesive layer.
6. The hard disk drive of claim 1 , wherein said barrier layer of said laminated film comprises a metal.
7. The hard disk drive of claim 1 , wherein said barrier layer of said laminated film comprises aluminum.
8. The hard disk drive of claim 1 , wherein said film surface protective layer of said laminated film comprises a thermoplastic polymer.
9. The hard disk drive of claim 1 , wherein said film surface protective layer of said laminated film comprises polyethylene terephthalate.
10. The hard disk drive of claim 1 ,
wherein said heat sealant layer of said laminated film comprises polypropylene;
wherein said barrier layer of said laminated film comprises aluminum; and
wherein said film surface protective layer of said laminated film comprises polyethylene terephthalate.
11. The hard disk drive of claim 1 , wherein said base film of said FCA comprises polypropylene.
12. A method of sealing a hard disk drive (HDD), the method comprising:
positioning an electrical flexible cable assembly (FCA) through an HDD enclosure base at an interface of an HDD internal space and an outside environment, wherein said FCA comprises a base film and an electrical conductor layer coupled to said base film;
positioning a laminated film to overlap with a portion of said base and a portion of said FCA, wherein said laminated film comprises a heat sealant layer, a barrier layer inhibiting egress of gas from said internal space, and a film surface protective layer protecting said heat sealant and barrier layers; and
bonding said laminated film to said portion of said base and said portion of said FCA by applying heat and pressure to said laminated film.
13. The method of claim 12 , wherein said FCA further comprises a cover layer over said electrical conductor layer, and
wherein positioning said laminated film includes positioning said laminated film over at least a portion of said cover layer of said FCA; and
wherein bonding said laminated film includes bonding said laminated film with said portion of said cover layer of said FCA.
14. The method of claim 13 ,
wherein said cover layer comprises polypropylene; and
wherein said heat sealant layer comprises polypropylene.
15. The method of claim 12 , further comprising:
positioning a metal adhesive layer between an outside surface of said base and at least a portion of said FCA;
wherein positioning said laminated film includes positioning a portion of said laminated film over a portion of said adhesive layer; and
wherein bonding said laminated film includes bonding said portion of said laminated film with said portion of said adhesive layer.
16. The method of claim 12 , wherein said barrier layer comprises aluminum.
17. The method of claim 12 , wherein said film surface protective layer comprises polyethylene terephthalate.
18. The method of claim 12 , wherein:
said heat sealant layer comprises polypropylene;
said barrier layer comprises aluminum; and
said film surface protective layer comprises polyethylene terephthalate.