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Abstract

Method of producing a data processing care by thermo-moulding a mixture of pulverulent polycarbonate with lamp-black at a proportion of 8 ppm of lamp-black with respect to the basic thermo-hardenable material. The inner face of the wall of the mould which gives rise to the front face of the card has a checkered pattern, the distance between the recesses, respectively the protrusions, of the checkered pattern being a multiple of the wave length of the laser ray used for applying on the card the contrasted signs. A laser tube piloted by a piloting unit including a program containing the indications which are to appear on the card, is used for directing a laser radiation onto the card. The infrared rays are absorbed by the lamp-black contained in the mass of the material of the card which is heated, thereby producing a change of color resulting in appearance of signs such as a signature and a photograph on the front face of the card.

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First Claim