Patent ID: 6259035
Filing Date: 2001-07-10
Classification: C23C,C25D,G06K,H01L

Abstract:
A process for producing a chip card having a chip module and a structured metallization on said chip module for forming contact surfaces, comprising the steps of:applying first and second metallization layers on a plastic substrate of said chip module via a first galvanic deposition to create a base for said chip module;introducing said base to a coloring bath for creating at least two different surface regions on said first and second metallization layers of said base via a second galvanic deposition by selectively masking portions of said base during said step of introducing said base to said coloring bath, such that said at least two different surface regions comprise a portion of a design on the chip card, said step of creating at least two different surface regions including the steps of applying a first surface region layer comprising a first metal or metal alloy with first light reflection and absorption characteristics to an entire surface of one side of said base, applying a second surface region comprising a second metal or metal alloy with second light reflection and absorption characteristics to one of an entire surface and a partial region of said one side of said base, and selectively removing portion of said second surface region layer using an electrochemical process such that said first region layer is visible through said second surface region layer where said second surface region layer is removed.