PURPOSE: To provide a filter for use in capturing fine particles such as dust in the air, mineral composition, labeled compound of radioactive isotope, microorganism, virus, organismic cell, constitecents of the cells, etc.
CONSTITUTION: A filter 7 comprises an assembly 3 of a large number of extremely fine wires 1 whose outer casings 2 are in close contact with one another, wherein said assembly 3 is cut off in a direction in parallel with a thin plate 4 perpendicular to the axial direction of the assembly, with the result that a large number of trace holes 6 of core wires 5 of wires 1 are formed in the plate 4. The thickness of the plate 4 is 1-5μm and the inner diameter of the holes 6 is 0.01-10μm and the area ratio of the holes 6 to the plate 4 is 20-90%.
KAWAMURA HIROTAKA
KAWAMURA HIROTAKA