FIELD: engineering of cards with built-in microprocessor.
SUBSTANCE: method includes making of cards, contacts of which are formed by several layers, uppermost of which is a precious metal layer due to the fact that contacts are treated with laser beam, speed of movement of which is selected in such a way that time of local presence of laser dot on contacts and local beam energy transfer connected to this time caused local melting of uppermost layer and at least one more of contact layers placed below it with forming of alloy, alloyed by precious metals.
EFFECT: possible application to contacts of visible information without worsening of protection of metallic contacts from corrosion and oxidizing.
2 cl, 10 dwg
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