Method of manufacture of a data processing card provided with si

Details Method of manufacture of a data processing card provided with si Method of manufacture of a data processing card provided with si

1991-08-19

1993-08-10

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating luminescent material

264 25, B29C 3342, B29C 3508, B29C 7104

Patent

active

052346242

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.

REFERENCES:
patent: 3594261 (1971-07-01), Broerman
patent: 3627858 (1971-12-01), Parts
patent: 4547002 (1985-10-01), Colgate
patent: 4654290 (1987-03-01), Spanjer
patent: 4657714 (1987-04-01), Kenmochi et al.
patent: 4661305 (1987-04-01), Carlomagno
patent: 4704327 (1987-11-01), Schieber
patent: 4710330 (1987-12-01), Lewandowski et al.
patent: 4711690 (1987-12-01), Haghiri-Tehrani

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