Multi-functional filter for removing contaminants from an enclosure
AssigneeGore Enterprise Holdings, Inc.
InventorEdwin Dauber
Life of this patent
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Abstract
The invention relates to a device for filtering contaminants, such as particulates and vapor phase contaminants, from a confined environment such as electronic or optical devices susceptible to contamination (e.g. computer disk drives) by incorporating multiple filtration functions into a unitary filter. Filtration functions include a combination of inlet, or breather, filter and recirculation filter. Moreover, adsorbent functions can be added to the filter depending on desired functionality within the enclosure.
Claims30
A disk drive filter assembly for selectively removing contaminants from a disk drive enclosure comprising:
- a layer of adhesive having at least one opening therein, each of said at least opening defined by a perimeter, for location over a breather hole in said enclosure;
- a first filter layer having an air permeability of from 0.05 to 40 Frazier and a particle filtration efficiency of at least 90% for 0.1 micron sized particles adjacent said adhesive layer and covering said at least one opening;
- and
- a second filter layer having an air permeability of from 18 to 1000 Frazier and a particle filtration efficiency of at least 55% for 0.1 micron sized particles adjacent said first filtration layer.
A disk drive filter assembly for selectively removing contaminants from a disk drive enclosure comprising:
- a layer of adhesive having at least one opening therein, each of said at least opening defined by a perimeter, for location over a breather hole in said enclosure;
- a filter layer having a particle filtration efficiency of at least 97% for 0.1 micron sized particles adjacent said adhesive layer and covering said at least one opening;
- an electret filter layer comprising a fibrous electret material bonded to a support material and located adjacent said filter layer;
- and
- an outer layer which constrains protruding fibers from the adjacent electret filter layer.
Dependencies are inferred from the claim text.