Disk drive having a conformal peripheral foil seal having an opening covered by a central metal cap
View Patent ↗A novel hermetically sealed disk drive comprises a disk drive enclosure that includes a disk drive base with a bottom face, four side faces, and a top cover. The disk drive also comprises a peripheral foil seal overlapping each of the four side faces and having a first opening therethrough that overlies the upper surface of the top cover. The peripheral foil seal conforms to the disk drive enclosure and is adhered to the top face and to each of the four side faces by a first continuous adhesive layer. The hermetically sealed disk drive also includes a central metal cap completely covering the first opening and being adhered to the upper surface of the top cover through the first opening by a second continuous adhesive layer. The central metal cap is thicker than the continuous metal foil, and the disk drive enclosure is helium-filled.
1. A hermetically sealed disk drive comprising:
a disk drive enclosure including
a disk drive base with a bottom face and four side faces, and
a top cover, wherein the disk drive enclosure has a top face that includes an upper surface of the top cover and an upper surface of the disk drive base;
a peripheral foil seal including
a continuous metal foil overlapping each of the four side faces and having a first opening therethrough that overlies the upper surface of the top cover, and
a first continuous adhesive layer coating the continuous metal foil,
the peripheral foil seal conforming to the disk drive enclosure and being adhered to the top face and to each of the four side faces by the first continuous adhesive layer; and
a central metal cap completely covering the first opening and being adhered to the upper surface of the top cover through the first opening by a second continuous adhesive layer, the central metal cap being thicker than the continuous metal foil;
wherein the disk drive enclosure is helium-filled.
2. The hermetically sealed disk drive of claim 1 wherein the first continuous adhesive layer comprises acrylic pressure sensitive adhesive having a thickness in the range 10 to 50 microns.
3. The hermetically sealed disk drive of claim 1 wherein the continuous metal foil defines a metal foil thickness in the range 2 to 100 microns.
4. The hermetically sealed disk drive of claim 3 wherein the continuous metal foil comprises copper foil or aluminum foil.
5. The hermetically sealed disk drive of claim 1 wherein the continuous metal foil comprises stainless steel foil having a thickness in the range 2 to 40 microns.
6. The hermetically sealed disk drive of claim 1 wherein the helium-filled enclosure encloses helium having between 0.3 to 1.0 atmosphere partial pressure.
7. The hermetically sealed disk drive of claim 6 wherein the helium-filled enclosure also encloses air having between 0 to 0.7 atmosphere partial pressure.