Method and apparatus for fabricating anisotropically conductive

Details Method and apparatus for fabricating anisotropically conductive Method and apparatus for fabricating anisotropically conductive

1987-09-18

1988-10-18

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

29877, 29883, 264108, 26427211, 26427213, 2642791, 335296, 335297, 335298, 335299, 335303, 335306, 425 3, 425DIG33, 439586, B29C 3910, H01F 702

Patent

active

047786353

ABSTRACT:
A sheet (10) of anisotropically conductive material may be fabricated by mixing a quantity of electrically conductive, ferromagnetic particles (16), typically spheres, in an uncured polymer (12). The polymer is then cured in a magnetic field which causes the particles to align in chains (14) each parallel to the lines of the field. In accordance with the invention, a spatially varying magnetic field, comprised of first and second substantially uniformly spaced regions (22 and 24) of high and low field strength, respectively, is applied to the polymer (12) during curing. The difference in the strength of the magnetic field in the first and second regions is such as to give rise to a lateral force on the particles which urges them into the first regions of high field strength where the particles align into chains. Since the first regions of high field strength are substantially uniformly spaced, the chains of particles in the polymer will be likewise substantially uniformly spaced.

REFERENCES:
patent: 3117065 (1964-01-01), Wooten
patent: 3127544 (1964-03-01), Blume, Jr.
patent: 3128544 (1964-04-01), Allingham
patent: 4209481 (1980-06-01), Kashiro et al.
patent: 4292261 (1981-09-01), Kotani et al.

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