United States Patent Number 5,789,068
August 4, 1998
Reference*
Preformed solder parts coated with parylene in a thickness effective to exhibit predetermined interference colors
Patent Abstract
The invention provides a solder preform coated with a predetermined thickness
of parylene which physically and chemically protects the preform, as well
as a provides a unique optical interference coating which reflects at characteristic
frequencies. When predetermined thicknesses of parylene are selected, the
parylene coating provides an interference coating which causes the solder
preforms to appear green, or gold, or blue in color. The parylene coating,
which is otherwise colorless and transparent thus enables solder preforms
to be visually distinguishable by alloy type (or customer) by the use of colors,
or blends of colors. The invention further provides an effective method of
visually verifying the reflow status of a solder preform during manufacturing
by examining the color of the solder preform after heating. The interference
colors provided by the parylene coating do not persist through the reflow
process, and thus, the change in color of the solder preform after reflow
can be used as an effective visual check to determine if the preform has been
heated sufficiently.
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