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This article describes a procedure for the manufacture of a continuous and anisotropically conductive substrate with good mechanical strength.
English (United States)
This text was extracted from a PDF file.
100% of the total text.
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Laser-Assisted Graphitization of Polyimides and Its Use For Manufacture of
Anisotropically Conductive Materials
This article describes a procedure for the manufacture of a continuous and
anisotropically conductive substrate with good mechanical strength.
A. A thin, less than 3/4 mil thick, KAPTON* film is scanned, in air or by N(2)
or in a vacuum, with a pulsed laser beam to produce graphitized dots at specified
intervals. These graphite dots impart to the plastic the required conductivity,
while the unexposed material provides the tensile strength and flexibility.
B. A uniform metalization (aluminum) on one side of the film may follow.
This metalization electrically connects all the dots.
C. Steps A and B can be made in an aluminum evaporation chamber.
D. A linear array of lenses, fabricated from plastic, can replace the single
lens so that a row of dots can be made at the same time.
In a typical experiment the 70 mw 4579 angstroms beam of an
argon ion laser was used to make the graphitic dots in 1/2 mil
KAPTON. The size and the conductivity of the dots produced were
nearly independent of the focal length of the lens which focused the
light onto the film. The dots were roughly 2 mils in diameter and
cylindrical in shape; the resistivity per dot was 300 M(omega). The
energy required per dot was 1 milli-joule.
* Trademark of E. I. du Pont de Nemours & Co.